blender-archive/source/blender/editors/interface/interface_widgets.c

/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2009 Blender Foundation.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/interface/interface_widgets.c
 *  \ingroup edinterface
 */

#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "DNA_brush_types.h"
#include "DNA_screen_types.h"
#include "DNA_userdef_types.h"

#include "BLI_math.h"
#include "BLI_rect.h"
#include "BLI_string.h"
#include "BLI_string_utf8.h"
#include "BLI_utildefines.h"

#include "BKE_context.h"

#include "RNA_access.h"

#include "BLF_api.h"

#include "UI_interface.h"
#include "UI_interface_icons.h"

#include "interface_intern.h"

#include "GPU_batch.h"
#include "GPU_batch_presets.h"
#include "GPU_immediate.h"
#include "GPU_immediate_util.h"
#include "GPU_matrix.h"
#include "GPU_state.h"

#ifdef WITH_INPUT_IME
#  include "WM_types.h"
#endif

/* icons are 80% of height of button (16 pixels inside 20 height) */
#define ICON_SIZE_FROM_BUTRECT(rect) (0.8f * BLI_rcti_size_y(rect))

/* Button state argument shares bits with 'uiBut.flag'.
 * reuse flags that aren't needed for drawing to avoid collision. */
enum {
	/* Show that holding the button opens a menu. */
	UI_STATE_HOLD_ACTION = UI_BUT_UPDATE_DELAY,
	UI_STATE_TEXT_INPUT  = UI_BUT_UNDO,
	UI_STATE_ACTIVE_LEFT  = UI_BUT_VALUE_CLEAR,
	UI_STATE_ACTIVE_RIGHT = UI_BUT_TEXTEDIT_UPDATE,

	UI_STATE_FLAGS_ALL = (UI_STATE_HOLD_ACTION |
	                      UI_STATE_TEXT_INPUT |
	                      UI_STATE_ACTIVE_LEFT |
	                      UI_STATE_ACTIVE_RIGHT),
};
/* Prevent accidental use. */
#define UI_BUT_UPDATE_DELAY ((void)0)
#define UI_BUT_UNDO ((void)0)


/* ************** widget base functions ************** */
/**
 * - in: roundbox codes for corner types and radius
 * - return: array of `[size][2][x, y]` points, the edges of the roundbox, + UV coords
 *
 * - draw black box with alpha 0 on exact button boundbox
 * - for every AA step:
 *    - draw the inner part for a round filled box, with color blend codes or texture coords
 *    - draw outline in outline color
 *    - draw outer part, bottom half, extruded 1 pixel to bottom, for emboss shadow
 *    - draw extra decorations
 * - draw background color box with alpha 1 on exact button boundbox
 */

/* fill this struct with polygon info to draw AA'ed */
/* it has outline, back, and two optional tria meshes */

typedef struct uiWidgetTrias {
	uint tot;
	int type;
	float size, center[2];

	float vec[16][2];
	const uint (*index)[3];

} uiWidgetTrias;

/* max as used by round_box__edges */
/* Make sure to change widget_base_vert.glsl accordingly. */
#define WIDGET_CURVE_RESOLU 9
#define WIDGET_SIZE_MAX (WIDGET_CURVE_RESOLU * 4)

typedef struct uiWidgetBase {
	/* TODO remove these completely */
	int totvert, halfwayvert;
	float outer_v[WIDGET_SIZE_MAX][2];
	float inner_v[WIDGET_SIZE_MAX][2];
	float inner_uv[WIDGET_SIZE_MAX][2];

	bool draw_inner, draw_outline, draw_emboss;

	uiWidgetTrias tria1;
	uiWidgetTrias tria2;

	/* Widget shader parameters, must match the shader layout. */
	uiWidgetBaseParameters uniform_params;
} uiWidgetBase;

/** uiWidgetType: for time being only for visual appearance,
 * later, a handling callback can be added too
 */
typedef struct uiWidgetType {

	/* pointer to theme color definition */
	const uiWidgetColors *wcol_theme;
	uiWidgetStateColors *wcol_state;

	/* converted colors for state */
	uiWidgetColors wcol;

	void (*state)(struct uiWidgetType *, int state, int drawflag);
	void (*draw)(uiWidgetColors *, rcti *, int state, int roundboxalign);
	void (*custom)(uiBut *, uiWidgetColors *, rcti *, int state, int roundboxalign);
	void (*text)(const uiFontStyle *, const uiWidgetColors *, uiBut *, rcti *);

} uiWidgetType;


/* *********************** draw data ************************** */

static const float cornervec[WIDGET_CURVE_RESOLU][2] = {
	{0.0, 0.0}, {0.195, 0.02}, {0.383, 0.067},
	{0.55, 0.169}, {0.707, 0.293}, {0.831, 0.45},
	{0.924, 0.617}, {0.98, 0.805}, {1.0, 1.0}
};


const float ui_pixel_jitter[UI_PIXEL_AA_JITTER][2] = {
	{ 0.468813, -0.481430}, {-0.155755, -0.352820},
	{ 0.219306, -0.238501}, {-0.393286, -0.110949},
	{-0.024699,  0.013908}, { 0.343805,  0.147431},
	{-0.272855,  0.269918}, { 0.095909,  0.388710}
};
#define WIDGET_AA_JITTER UI_PIXEL_AA_JITTER
#define jit ui_pixel_jitter

/* -------------------------------------------------------------------- */
/** \name Shape Preset Data
 * \{ */

static const float g_shape_preset_number_arrow_vert[3][2] = {
	{-0.352077, 0.532607}, {-0.352077, -0.549313}, {0.330000, -0.008353}
};
static const uint g_shape_preset_number_arrow_face[1][3] = {
	{0, 1, 2}
};

static const float g_shape_preset_scroll_circle_vert[16][2] = {
	{0.382684, 0.923879}, {0.000001, 1.000000}, {-0.382683, 0.923880}, {-0.707107, 0.707107},
	{-0.923879, 0.382684}, {-1.000000, 0.000000}, {-0.923880, -0.382684}, {-0.707107, -0.707107},
	{-0.382683, -0.923880}, {0.000000, -1.000000}, {0.382684, -0.923880}, {0.707107, -0.707107},
	{0.923880, -0.382684}, {1.000000, -0.000000}, {0.923880, 0.382683}, {0.707107, 0.707107}
};
static const uint g_shape_preset_scroll_circle_face[14][3] = {
	{0, 1, 2}, {2, 0, 3}, {3, 0, 15}, {3, 15, 4}, {4, 15, 14}, {4, 14, 5}, {5, 14, 13}, {5, 13, 6},
	{6, 13, 12}, {6, 12, 7}, {7, 12, 11}, {7, 11, 8}, {8, 11, 10}, {8, 10, 9}
};

static const float g_shape_preset_menu_arrow_vert[6][2] = {
	{-0.33, 0.16}, {0.33, 0.16}, {0, 0.82},
	{0, -0.82}, {-0.33, -0.16}, {0.33, -0.16}
};
static const uint g_shape_preset_menu_arrow_face[2][3] = {{2, 0, 1}, {3, 5, 4}};

static const float g_shape_preset_checkmark_vert[6][2] = {
	{-0.578579, 0.253369},  {-0.392773, 0.412794},  {-0.004241, -0.328551},
	{-0.003001, 0.034320},  {1.055313, 0.864744},   {0.866408, 1.026895}
};

static const uint g_shape_preset_checkmark_face[4][3] = {
	{3, 2, 4}, {3, 4, 5}, {1, 0, 3}, {0, 2, 3}
};

#define OY (-0.2 / 2)
#define SC (0.35 * 2)
static const float g_shape_preset_hold_action_vert[6][2] = {
	{-0.5 + SC, 1.0 + OY},  {0.5, 1.0 + OY},  {0.5, 0.0 + OY + SC},
};
static const uint g_shape_preset_hold_action_face[2][3] = {{2, 0, 1}, {3, 5, 4}};
#undef OY
#undef SC

/** \} */

/* **************** Batch creations ****************** */
/**
 * In order to speed up UI drawing we create some batches that are then
 * modified by specialized shaders to draw certain elements really fast.
 * TODO: find a better place. Maybe it's own file?
 **/

/* offset in triavec[] in shader per type */
static const int tria_ofs[ROUNDBOX_TRIA_MAX] = {
	[ROUNDBOX_TRIA_NONE]              = 0,
	[ROUNDBOX_TRIA_ARROWS]            = 0,
	[ROUNDBOX_TRIA_SCROLL]            = 12,
	[ROUNDBOX_TRIA_MENU]              = 28,
	[ROUNDBOX_TRIA_CHECK]             = 34,
	[ROUNDBOX_TRIA_HOLD_ACTION_ARROW] = 40,
};
static const int tria_vcount[ROUNDBOX_TRIA_MAX] = {
	[ROUNDBOX_TRIA_NONE]              = 0,
	[ROUNDBOX_TRIA_ARROWS]            = 6,
	[ROUNDBOX_TRIA_SCROLL]            = 16,
	[ROUNDBOX_TRIA_MENU]              = 6,
	[ROUNDBOX_TRIA_CHECK]             = 6,
	[ROUNDBOX_TRIA_HOLD_ACTION_ARROW] = 3,
};

static struct {
	GPUBatch *roundbox_widget[ROUNDBOX_TRIA_MAX];

	GPUBatch *roundbox_simple;
	GPUBatch *roundbox_simple_aa;
	GPUBatch *roundbox_simple_outline;
	GPUBatch *roundbox_shadow;

	GPUVertFormat format;
	uint vflag_id;
} g_ui_batch_cache = {{0}};

static GPUVertFormat *vflag_format(void)
{
	if (g_ui_batch_cache.format.attr_len == 0) {
		GPUVertFormat *format = &g_ui_batch_cache.format;
		g_ui_batch_cache.vflag_id = GPU_vertformat_attr_add(format, "vflag", GPU_COMP_U32, 1, GPU_FETCH_INT);
	}
	return &g_ui_batch_cache.format;
}

#define INNER 0
#define OUTLINE 1
#define EMBOSS 2
#define NO_AA WIDGET_AA_JITTER

static void set_roundbox_vertex_data(
        GPUVertBufRaw *vflag_step, uint32_t d)
{
	uint32_t *data = GPU_vertbuf_raw_step(vflag_step);
	*data = d;
}

static uint32_t set_roundbox_vertex(
        GPUVertBufRaw *vflag_step,
        int corner_id, int corner_v, int jit_v, bool inner, bool emboss, int color)
{
	uint32_t *data = GPU_vertbuf_raw_step(vflag_step);
	*data  = corner_id;
	*data |= corner_v << 2;
	*data |= jit_v << 6;
	*data |= color << 12;
	*data |= (inner) ? (1 << 10) : 0; /* is inner vert */
	*data |= (emboss) ? (1 << 11) : 0; /* is emboss vert */
	return *data;
}

static uint32_t set_tria_vertex(
        GPUVertBufRaw *vflag_step,
        int tria_type, int tria_v, int tria_id, int jit_v)
{
	uint32_t *data = GPU_vertbuf_raw_step(vflag_step);
	if (ELEM(tria_type, ROUNDBOX_TRIA_ARROWS)) {
		tria_v += tria_id * tria_vcount[ROUNDBOX_TRIA_ARROWS];
	}
	*data  = tria_ofs[tria_type] + tria_v;
	*data |= jit_v << 6;
	*data |= (tria_id == 0) ? (1 << 10) : 0; /* is first tria */
	*data |= 1 << 14; /* is tria vert */
	return *data;
}

static void roundbox_batch_add_tria(GPUVertBufRaw *vflag_step, int tria, uint32_t last_data)
{
	const int tria_num = ELEM(tria, ROUNDBOX_TRIA_CHECK, ROUNDBOX_TRIA_HOLD_ACTION_ARROW, ROUNDBOX_TRIA_MENU) ? 1 : 2;
	/* for each tria */
	for (int t = 0; t < tria_num; ++t) {
		for (int j = 0; j < WIDGET_AA_JITTER; j++) {
			/* restart */
			set_roundbox_vertex_data(vflag_step, last_data);
			set_tria_vertex(vflag_step, tria, 0, t, j);
			for (int v = 0; v < tria_vcount[tria]; v++) {
				last_data = set_tria_vertex(vflag_step, tria, v, t, j);
			}
		}
	}
}

GPUBatch *ui_batch_roundbox_widget_get(int tria)
{
	if (g_ui_batch_cache.roundbox_widget[tria] == NULL) {
		uint32_t last_data;
		GPUVertBufRaw vflag_step;
		GPUVertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());
		int vcount = WIDGET_SIZE_MAX; /* inner */
		vcount += 2; /* restart */
		vcount += ((WIDGET_SIZE_MAX + 1) * 2) * WIDGET_AA_JITTER; /* outline (edges) */
		vcount += 2; /* restart */
		vcount += ((WIDGET_CURVE_RESOLU * 2) * 2) * WIDGET_AA_JITTER; /* emboss */
		if (tria) {
			vcount += (tria_vcount[tria] + 2) * WIDGET_AA_JITTER; /* tria1 */
			if (!ELEM(tria, ROUNDBOX_TRIA_CHECK, ROUNDBOX_TRIA_HOLD_ACTION_ARROW, ROUNDBOX_TRIA_MENU)) {
				vcount += (tria_vcount[tria] + 2) * WIDGET_AA_JITTER; /* tria2 */
			}
		}
		GPU_vertbuf_data_alloc(vbo, vcount);
		GPU_vertbuf_attr_get_raw_data(vbo, g_ui_batch_cache.vflag_id, &vflag_step);
		/* Inner */
		for (int c1 = 0, c2 = 3; c1 < 2; c1++, c2--) {
			for (int a1 = 0, a2 = WIDGET_CURVE_RESOLU -1; a2 >= 0; a1++, a2--) {
				last_data = set_roundbox_vertex(&vflag_step, c1, a1, NO_AA, true, false, INNER);
				last_data = set_roundbox_vertex(&vflag_step, c2, a2, NO_AA, true, false, INNER);
			}
		}
		/* restart */
		set_roundbox_vertex_data(&vflag_step, last_data);
		set_roundbox_vertex(&vflag_step, 0, 0, 0, true, false, OUTLINE);
		/* Outlines */
		for (int j = 0; j < WIDGET_AA_JITTER; j++) {
			for (int c = 0; c < 4; c++) {
				for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
					set_roundbox_vertex(&vflag_step, c, a, j, true, false, OUTLINE);
					set_roundbox_vertex(&vflag_step, c, a, j, false, false, OUTLINE);
				}
			}
			/* Close the loop. */
			set_roundbox_vertex(&vflag_step, 0, 0, j, true, false, OUTLINE);
			last_data = set_roundbox_vertex(&vflag_step, 0, 0, j, false, false, OUTLINE);
		}
		/* restart */
		set_roundbox_vertex_data(&vflag_step, last_data);
		set_roundbox_vertex(&vflag_step, 0, 0, 0, false, false, EMBOSS);
		/* Emboss */
		/* go back and forth : avoid degenerate triangle (but beware of backface cull) */
		bool rev = false;
		for (int j = 0; j < WIDGET_AA_JITTER; j++, rev = !rev) {
			for (int c = (rev) ? 1 : 0; (rev) ? c >= 0 : c < 2; (rev) ? c-- : c++) {
				int sta = (rev) ? WIDGET_CURVE_RESOLU - 1 : 0;
				int end = WIDGET_CURVE_RESOLU;
				for (int a = sta; (rev) ? a >= 0 : a < end; (rev) ? a-- : a++) {
					set_roundbox_vertex(&vflag_step, c, a, j, false, false, EMBOSS);
					last_data = set_roundbox_vertex(&vflag_step, c, a, j, false, true, EMBOSS);
				}
			}
		}
		if (tria) {
			roundbox_batch_add_tria(&vflag_step, tria, last_data);
		}
		g_ui_batch_cache.roundbox_widget[tria] = GPU_batch_create_ex(GPU_PRIM_TRI_STRIP, vbo, NULL, GPU_BATCH_OWNS_VBO);
		gpu_batch_presets_register(g_ui_batch_cache.roundbox_widget[tria]);
	}
	return g_ui_batch_cache.roundbox_widget[tria];
}

GPUBatch *ui_batch_roundbox_get(bool filled, bool antialiased)
{
	GPUBatch **batch = NULL;

	if (filled) {
		if (antialiased)
			batch = &g_ui_batch_cache.roundbox_simple_aa;
		else
			batch = &g_ui_batch_cache.roundbox_simple;
	}
	else {
		if (antialiased)
			BLI_assert(0); /* Use GL_LINE_SMOOTH instead!!: */
		else
			batch = &g_ui_batch_cache.roundbox_simple_outline;
	}

	if (*batch == NULL) {
		uint32_t last_data;
		GPUVertBufRaw vflag_step;
		GPUVertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());
		int vcount = WIDGET_SIZE_MAX;
		vcount += (filled) ? 2 : 0;
		vcount *= (antialiased) ? WIDGET_AA_JITTER : 1;
		GPU_vertbuf_data_alloc(vbo, vcount);
		GPU_vertbuf_attr_get_raw_data(vbo, g_ui_batch_cache.vflag_id, &vflag_step);

		if (filled) {
			for (int j = 0; j < WIDGET_AA_JITTER; j++) {
				if (!antialiased) {
					j = NO_AA;
				}
				/* restart */
				set_roundbox_vertex(&vflag_step, 0, 0, j, true, false, INNER);
				for (int c1 = 0, c2 = 3; c1 < 2; c1++, c2--) {
					for (int a1 = 0, a2 = WIDGET_CURVE_RESOLU -1; a2 >= 0; a1++, a2--) {
						last_data = set_roundbox_vertex(&vflag_step, c1, a1, j, true, false, INNER);
						last_data = set_roundbox_vertex(&vflag_step, c2, a2, j, true, false, INNER);
					}
				}
				/* restart */
				set_roundbox_vertex_data(&vflag_step, last_data);
				if (!antialiased) {
					break;
				}
			}
			*batch = GPU_batch_create_ex(GPU_PRIM_TRI_STRIP, vbo, NULL, GPU_BATCH_OWNS_VBO);
		}
		else {
			for (int j = 0; j < WIDGET_AA_JITTER; j++) {
				if (!antialiased) {
					j = NO_AA;
				}
				for (int c = 0; c < 4; c++) {
					for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
						set_roundbox_vertex(&vflag_step, c, a, j, true, false, INNER);
					}
				}
				if (!antialiased) {
					break;
				}
			}
			*batch = GPU_batch_create_ex(GPU_PRIM_LINE_LOOP, vbo, NULL, GPU_BATCH_OWNS_VBO);
		}

		gpu_batch_presets_register(*batch);
	}
	return *batch;
}

GPUBatch *ui_batch_roundbox_shadow_get(void)
{
	if (g_ui_batch_cache.roundbox_shadow == NULL) {
		uint32_t last_data;
		GPUVertBufRaw vflag_step;
		GPUVertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());
		int vcount = (WIDGET_SIZE_MAX + 1) * 2 + 2 + WIDGET_SIZE_MAX;
		GPU_vertbuf_data_alloc(vbo, vcount);
		GPU_vertbuf_attr_get_raw_data(vbo, g_ui_batch_cache.vflag_id, &vflag_step);

		for (int c = 0; c < 4; c++) {
			for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
				set_roundbox_vertex(&vflag_step, c, a, NO_AA, true, false, INNER);
				set_roundbox_vertex(&vflag_step, c, a, NO_AA, false, false, INNER);
			}
		}
		/* close loop */
		last_data = set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, true, false, INNER);
		last_data = set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, false, false, INNER);
		/* restart */
		set_roundbox_vertex_data(&vflag_step, last_data);
		set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, true, false, INNER);
		/* filled */
		for (int c1 = 0, c2 = 3; c1 < 2; c1++, c2--) {
			for (int a1 = 0, a2 = WIDGET_CURVE_RESOLU -1; a2 >= 0; a1++, a2--) {
				set_roundbox_vertex(&vflag_step, c1, a1, NO_AA, true, false, INNER);
				set_roundbox_vertex(&vflag_step, c2, a2, NO_AA, true, false, INNER);
			}
		}
		g_ui_batch_cache.roundbox_shadow = GPU_batch_create_ex(GPU_PRIM_TRI_STRIP, vbo, NULL, GPU_BATCH_OWNS_VBO);
		gpu_batch_presets_register(g_ui_batch_cache.roundbox_shadow);
	}
	return g_ui_batch_cache.roundbox_shadow;
}

#undef INNER
#undef OUTLINE
#undef EMBOSS
#undef NO_AA

/* ************************************************* */

void UI_draw_anti_tria(float x1, float y1, float x2, float y2, float x3, float y3,
                       const float color[4])
{
	float tri_arr[3][2] = {{x1, y1}, {x2, y2}, {x3, y3}};
	float draw_color[4];

	copy_v4_v4(draw_color, color);
	/* Note: This won't give back the original color. */
	draw_color[3] *= 1.0f / WIDGET_AA_JITTER;

	GPU_blend(true);

	uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

	immUniformColor4fv(draw_color);
	immBegin(GPU_PRIM_TRIS, 3 * WIDGET_AA_JITTER);

	/* for each AA step */
	for (int j = 0; j < WIDGET_AA_JITTER; j++) {
		immVertex2f(pos, tri_arr[0][0] + jit[j][0], tri_arr[0][1] + jit[j][1]);
		immVertex2f(pos, tri_arr[1][0] + jit[j][0], tri_arr[1][1] + jit[j][1]);
		immVertex2f(pos, tri_arr[2][0] + jit[j][0], tri_arr[2][1] + jit[j][1]);
	}

	immEnd();

	immUnbindProgram();

	GPU_blend(false);
}

/* triangle 'icon' inside rect */
void ui_draw_anti_tria_rect(const rctf *rect, char dir, const float color[4])
{
	if (dir == 'h') {
		float half = 0.5f * BLI_rctf_size_y(rect);
		UI_draw_anti_tria(rect->xmin, rect->ymin, rect->xmin, rect->ymax, rect->xmax, rect->ymin + half, color);
	}
	else {
		float half = 0.5f * BLI_rctf_size_x(rect);
		UI_draw_anti_tria(rect->xmin, rect->ymax, rect->xmax, rect->ymax, rect->xmin + half, rect->ymin, color);
	}
}


void UI_draw_anti_fan(float tri_array[][2], uint length, const float color[4])
{
	float draw_color[4];

	copy_v4_v4(draw_color, color);
	draw_color[3] *= 2.0f / WIDGET_AA_JITTER;

	GPU_blend(true);

	uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

	immUniformColor4fv(draw_color);

	/* for each AA step */
	for (int j = 0; j < WIDGET_AA_JITTER; j++) {
		immBegin(GPU_PRIM_TRI_FAN, length);
		immVertex2f(pos, tri_array[0][0], tri_array[0][1]);
		immVertex2f(pos, tri_array[1][0], tri_array[1][1]);

		/* We jitter only the middle of the fan, the extremes are pinned. */
		for (int i = 2; i < length - 1; i++) {
			immVertex2f(pos, tri_array[i][0] + jit[j][0], tri_array[i][1] + jit[j][1]);
		}

		immVertex2f(pos, tri_array[length - 1][0], tri_array[length - 1][1]);
		immEnd();
	}

	immUnbindProgram();

	GPU_blend(false);
}

static void widget_init(uiWidgetBase *wtb)
{
	wtb->totvert = wtb->halfwayvert = 0;
	wtb->tria1.tot = 0;
	wtb->tria2.tot = 0;
	wtb->tria1.type = ROUNDBOX_TRIA_NONE;
	wtb->tria1.size = 0;
	wtb->tria2.size = 0;

	wtb->draw_inner = true;
	wtb->draw_outline = true;
	wtb->draw_emboss = true;

	wtb->uniform_params.shade_dir = 1.0f;
	wtb->uniform_params.alpha_discard = 1.0f;
}

/* helper call, makes shadow rect, with 'sun' above menu, so only shadow to left/right/bottom */
/* return tot */
static int round_box_shadow_edges(float (*vert)[2], const rcti *rect, float rad, int roundboxalign, float step)
{
	float vec[WIDGET_CURVE_RESOLU][2];
	float minx, miny, maxx, maxy;
	int a, tot = 0;

	rad += step;

	if (2.0f * rad > BLI_rcti_size_y(rect))
		rad = 0.5f * BLI_rcti_size_y(rect);

	minx = rect->xmin - step;
	miny = rect->ymin - step;
	maxx = rect->xmax + step;
	maxy = rect->ymax + step;

	/* mult */
	for (a = 0; a < WIDGET_CURVE_RESOLU; a++) {
		vec[a][0] = rad * cornervec[a][0];
		vec[a][1] = rad * cornervec[a][1];
	}

	/* start with left-top, anti clockwise */
	if (roundboxalign & UI_CNR_TOP_LEFT) {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = minx + rad - vec[a][0];
			vert[tot][1] = maxy - vec[a][1];
		}
	}
	else {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = minx;
			vert[tot][1] = maxy;
		}
	}

	if (roundboxalign & UI_CNR_BOTTOM_LEFT) {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = minx + vec[a][1];
			vert[tot][1] = miny + rad - vec[a][0];
		}
	}
	else {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = minx;
			vert[tot][1] = miny;
		}
	}

	if (roundboxalign & UI_CNR_BOTTOM_RIGHT) {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = maxx - rad + vec[a][0];
			vert[tot][1] = miny + vec[a][1];
		}
	}
	else {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = maxx;
			vert[tot][1] = miny;
		}
	}

	if (roundboxalign & UI_CNR_TOP_RIGHT) {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = maxx - vec[a][1];
			vert[tot][1] = maxy - rad + vec[a][0];
		}
	}
	else {
		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			vert[tot][0] = maxx;
			vert[tot][1] = maxy;
		}
	}
	return tot;
}

/* this call has 1 extra arg to allow mask outline */
static void round_box__edges(uiWidgetBase *wt, int roundboxalign, const rcti *rect, float rad, float radi)
{
	float vec[WIDGET_CURVE_RESOLU][2], veci[WIDGET_CURVE_RESOLU][2];
	float minx = rect->xmin, miny = rect->ymin, maxx = rect->xmax, maxy = rect->ymax;
	float minxi = minx + U.pixelsize; /* boundbox inner */
	float maxxi = maxx - U.pixelsize;
	float minyi = miny + U.pixelsize;
	float maxyi = maxy - U.pixelsize;
	/* for uv, can divide by zero */
	float facxi = (maxxi != minxi) ? 1.0f / (maxxi - minxi) : 0.0f;
	float facyi = (maxyi != minyi) ? 1.0f / (maxyi - minyi) : 0.0f;
	int a, tot = 0, minsize;
	const int hnum = (
	        (roundboxalign & (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT)) == (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT) ||
	        (roundboxalign & (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT)) == (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT)) ? 1 : 2;
	const int vnum = (
	        (roundboxalign & (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT)) == (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT) ||
	        (roundboxalign & (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT)) == (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT)) ? 1 : 2;

	minsize = min_ii(
	        BLI_rcti_size_x(rect) * hnum,
	        BLI_rcti_size_y(rect) * vnum);

	if (2.0f * rad > minsize)
		rad = 0.5f * minsize;

	if (2.0f * (radi + 1.0f) > minsize)
		radi = 0.5f * minsize - U.pixelsize;

	wt->uniform_params.rad = rad;
	wt->uniform_params.radi = radi;
	wt->uniform_params.facxi = facxi;
	wt->uniform_params.facyi = facyi;
	wt->uniform_params.round_corners[0] = (roundboxalign & UI_CNR_BOTTOM_LEFT) ? 1.0f : 0.0f;
	wt->uniform_params.round_corners[1] = (roundboxalign & UI_CNR_BOTTOM_RIGHT) ? 1.0f : 0.0f;
	wt->uniform_params.round_corners[2] = (roundboxalign & UI_CNR_TOP_RIGHT) ? 1.0f : 0.0f;
	wt->uniform_params.round_corners[3] = (roundboxalign & UI_CNR_TOP_LEFT) ? 1.0f : 0.0f;
	BLI_rctf_rcti_copy(&wt->uniform_params.rect, rect);
	BLI_rctf_init(&wt->uniform_params.recti, minxi, maxxi, minyi, maxyi);

	/* mult */
	for (a = 0; a < WIDGET_CURVE_RESOLU; a++) {
		veci[a][0] = radi * cornervec[a][0];
		veci[a][1] = radi * cornervec[a][1];
		vec[a][0] = rad * cornervec[a][0];
		vec[a][1] = rad * cornervec[a][1];
	}

	/* corner left-bottom */
	if (roundboxalign & UI_CNR_BOTTOM_LEFT) {

		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			wt->inner_v[tot][0] = minxi + veci[a][1];
			wt->inner_v[tot][1] = minyi + radi - veci[a][0];

			wt->outer_v[tot][0] = minx + vec[a][1];
			wt->outer_v[tot][1] = miny + rad - vec[a][0];

			wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
			wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
		}
	}
	else {
		wt->inner_v[tot][0] = minxi;
		wt->inner_v[tot][1] = minyi;

		wt->outer_v[tot][0] = minx;
		wt->outer_v[tot][1] = miny;

		wt->inner_uv[tot][0] = 0.0f;
		wt->inner_uv[tot][1] = 0.0f;

		tot++;
	}

	/* corner right-bottom */
	if (roundboxalign & UI_CNR_BOTTOM_RIGHT) {

		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			wt->inner_v[tot][0] = maxxi - radi + veci[a][0];
			wt->inner_v[tot][1] = minyi + veci[a][1];

			wt->outer_v[tot][0] = maxx - rad + vec[a][0];
			wt->outer_v[tot][1] = miny + vec[a][1];

			wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
			wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
		}
	}
	else {
		wt->inner_v[tot][0] = maxxi;
		wt->inner_v[tot][1] = minyi;

		wt->outer_v[tot][0] = maxx;
		wt->outer_v[tot][1] = miny;

		wt->inner_uv[tot][0] = 1.0f;
		wt->inner_uv[tot][1] = 0.0f;

		tot++;
	}

	wt->halfwayvert = tot;

	/* corner right-top */
	if (roundboxalign & UI_CNR_TOP_RIGHT) {

		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			wt->inner_v[tot][0] = maxxi - veci[a][1];
			wt->inner_v[tot][1] = maxyi - radi + veci[a][0];

			wt->outer_v[tot][0] = maxx - vec[a][1];
			wt->outer_v[tot][1] = maxy - rad + vec[a][0];

			wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
			wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
		}
	}
	else {
		wt->inner_v[tot][0] = maxxi;
		wt->inner_v[tot][1] = maxyi;

		wt->outer_v[tot][0] = maxx;
		wt->outer_v[tot][1] = maxy;

		wt->inner_uv[tot][0] = 1.0f;
		wt->inner_uv[tot][1] = 1.0f;

		tot++;
	}

	/* corner left-top */
	if (roundboxalign & UI_CNR_TOP_LEFT) {

		for (a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
			wt->inner_v[tot][0] = minxi + radi - veci[a][0];
			wt->inner_v[tot][1] = maxyi - veci[a][1];

			wt->outer_v[tot][0] = minx + rad - vec[a][0];
			wt->outer_v[tot][1] = maxy - vec[a][1];

			wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
			wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
		}

	}
	else {

		wt->inner_v[tot][0] = minxi;
		wt->inner_v[tot][1] = maxyi;

		wt->outer_v[tot][0] = minx;
		wt->outer_v[tot][1] = maxy;

		wt->inner_uv[tot][0] = 0.0f;
		wt->inner_uv[tot][1] = 1.0f;

		tot++;
	}

	BLI_assert(tot <= WIDGET_SIZE_MAX);

	wt->totvert = tot;
}

static void round_box_edges(uiWidgetBase *wt, int roundboxalign, const rcti *rect, float rad)
{
	round_box__edges(wt, roundboxalign, rect, rad, rad - U.pixelsize);
}

/* -------------------------------------------------------------------- */
/** \name Shape Preset Mini API
 * \{ */

/* based on button rect, return scaled array of triangles */
static void shape_preset_init_trias_ex(
        uiWidgetTrias *tria, const rcti *rect, float triasize, char where,
        /* input data */
        const float verts[][2], const int verts_tot,
        const uint tris[][3], const int tris_tot)
{
	float centx, centy, sizex, sizey, minsize;
	int a, i1 = 0, i2 = 1;

	if (where == 'r' || where == 'l') {
		minsize = BLI_rcti_size_y(rect);
	}
	else {
		minsize = BLI_rcti_size_x(rect);
	}

	/* center position and size */
	centx = (float)rect->xmin + 0.4f * minsize;
	centy = (float)rect->ymin + 0.5f * minsize;
	tria->size = sizex = sizey = -0.5f * triasize * minsize;

	if (where == 'r') {
		centx = (float)rect->xmax - 0.4f * minsize;
		sizex = -sizex;
	}
	else if (where == 't') {
		centx = (float)rect->xmin + 0.5f * minsize;
		centy = (float)rect->ymax - 0.5f * minsize;
		sizey = -sizey;
		i2 = 0; i1 = 1;
	}
	else if (where == 'b') {
		centx = (float)rect->xmin + 0.5f * minsize;
		sizex = -sizex;
		i2 = 0; i1 = 1;
	}

	for (a = 0; a < verts_tot; a++) {
		tria->vec[a][0] = sizex * verts[a][i1] + centx;
		tria->vec[a][1] = sizey * verts[a][i2] + centy;
	}

	tria->center[0] = centx;
	tria->center[1] = centy;

	tria->tot = tris_tot;
	tria->index = tris;
}

static void shape_preset_init_number_arrows(uiWidgetTrias *tria, const rcti *rect, float triasize, char where)
{
	tria->type = ROUNDBOX_TRIA_ARROWS;
	shape_preset_init_trias_ex(
	        tria, rect, triasize, where,
	        g_shape_preset_number_arrow_vert, ARRAY_SIZE(g_shape_preset_number_arrow_vert),
	        g_shape_preset_number_arrow_face, ARRAY_SIZE(g_shape_preset_number_arrow_face));
}

static void shape_preset_init_hold_action(uiWidgetTrias *tria, const rcti *rect, float triasize, char where)
{
	tria->type = ROUNDBOX_TRIA_HOLD_ACTION_ARROW;
	/* With the current changes to use batches for widget drawing, the code
	 * below is doing almost nothing effectively. 'where' doesn't work either,
	 * shader is currently hardcoded to work for the button triangle pointing
	 * at the lower right. The same limitation applies to other trias as well.
	 * XXX Should be addressed. */
	shape_preset_init_trias_ex(
	        tria, rect, triasize, where,
	        g_shape_preset_hold_action_vert, ARRAY_SIZE(g_shape_preset_hold_action_vert),
	        g_shape_preset_hold_action_face, ARRAY_SIZE(g_shape_preset_hold_action_face));
}

static void shape_preset_init_scroll_circle(uiWidgetTrias *tria, const rcti *rect, float triasize, char where)
{
	tria->type = ROUNDBOX_TRIA_SCROLL;
	shape_preset_init_trias_ex(
	        tria, rect, triasize, where,
	        g_shape_preset_scroll_circle_vert, ARRAY_SIZE(g_shape_preset_scroll_circle_vert),
	        g_shape_preset_scroll_circle_face, ARRAY_SIZE(g_shape_preset_scroll_circle_face));
}

static void widget_draw_vertex_buffer(uint pos, uint col, int mode,
                                      const float quads_pos[WIDGET_SIZE_MAX][2],
                                      const uchar quads_col[WIDGET_SIZE_MAX][4],
                                      uint totvert)
{
	immBegin(mode, totvert);
	for (int i = 0; i < totvert; ++i) {
		if (quads_col)
			immAttr4ubv(col, quads_col[i]);
		immVertex2fv(pos, quads_pos[i]);
	}
	immEnd();
}

static void shape_preset_trias_from_rect_menu(uiWidgetTrias *tria, const rcti *rect)
{
	float width = BLI_rcti_size_x(rect);
	float height = BLI_rcti_size_y(rect);
	float centx, centy, size;

	tria->type = ROUNDBOX_TRIA_MENU;

	/* Center position and size. */
	tria->center[0] = centx = rect->xmin + 0.52f * BLI_rcti_size_y(rect);
	tria->center[1] = centy = rect->ymin + 0.52f * BLI_rcti_size_y(rect);
	tria->size = size = 0.4f * height;

	if (width > height * 1.1f) {
		/* For wider buttons align tighter to the right. */
		tria->center[0] = centx = rect->xmax - 0.32f * height;
	}

	for (int a = 0; a < 6; a++) {
		tria->vec[a][0] = size * g_shape_preset_menu_arrow_vert[a][0] + centx;
		tria->vec[a][1] = size * g_shape_preset_menu_arrow_vert[a][1] + centy;
	}

	tria->tot = 2;
	tria->index = g_shape_preset_menu_arrow_face;
}

static void shape_preset_trias_from_rect_checkmark(uiWidgetTrias *tria, const rcti *rect)
{
	float centx, centy, size;

	tria->type = ROUNDBOX_TRIA_CHECK;

	/* Center position and size. */
	tria->center[0] = centx = rect->xmin + 0.5f * BLI_rcti_size_y(rect);
	tria->center[1] = centy = rect->ymin + 0.5f * BLI_rcti_size_y(rect);
	tria->size = size = 0.5f * BLI_rcti_size_y(rect);

	for (int a = 0; a < 6; a++) {
		tria->vec[a][0] = size * g_shape_preset_checkmark_vert[a][0] + centx;
		tria->vec[a][1] = size * g_shape_preset_checkmark_vert[a][1] + centy;
	}

	tria->tot = 4;
	tria->index = g_shape_preset_checkmark_face;
}

/** \} */


/* prepares shade colors */
static void shadecolors4(char coltop[4], char coldown[4], const char *color, short shadetop, short shadedown)
{
	coltop[0] = CLAMPIS(color[0] + shadetop, 0, 255);
	coltop[1] = CLAMPIS(color[1] + shadetop, 0, 255);
	coltop[2] = CLAMPIS(color[2] + shadetop, 0, 255);
	coltop[3] = color[3];

	coldown[0] = CLAMPIS(color[0] + shadedown, 0, 255);
	coldown[1] = CLAMPIS(color[1] + shadedown, 0, 255);
	coldown[2] = CLAMPIS(color[2] + shadedown, 0, 255);
	coldown[3] = color[3];
}

static void round_box_shade_col4_r(uchar r_col[4], const char col1[4], const char col2[4], const float fac)
{
	const int faci = unit_float_to_uchar_clamp(fac);
	const int facm = 255 - faci;

	r_col[0] = (faci * col1[0] + facm * col2[0]) / 256;
	r_col[1] = (faci * col1[1] + facm * col2[1]) / 256;
	r_col[2] = (faci * col1[2] + facm * col2[2]) / 256;
	r_col[3] = (faci * col1[3] + facm * col2[3]) / 256;
}

static void widget_verts_to_triangle_strip(uiWidgetBase *wtb, const int totvert, float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2])
{
	int a;
	for (a = 0; a < totvert; a++) {
		copy_v2_v2(triangle_strip[a * 2], wtb->outer_v[a]);
		copy_v2_v2(triangle_strip[a * 2 + 1], wtb->inner_v[a]);
	}
	copy_v2_v2(triangle_strip[a * 2], wtb->outer_v[0]);
	copy_v2_v2(triangle_strip[a * 2 + 1], wtb->inner_v[0]);
}

static void widgetbase_outline(uiWidgetBase *wtb, uint pos)
{
	float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2]; /* + 2 because the last pair is wrapped */
	widget_verts_to_triangle_strip(wtb, wtb->totvert, triangle_strip);

	widget_draw_vertex_buffer(pos, 0, GL_TRIANGLE_STRIP, triangle_strip, NULL, wtb->totvert * 2 + 2);
}

static void widgetbase_set_uniform_alpha_discard(
        uiWidgetBase *wtb,
        const bool alpha_check,
        const float discard_factor)
{
	if (alpha_check) {
		wtb->uniform_params.alpha_discard = -discard_factor;
	}
	else {
		wtb->uniform_params.alpha_discard = discard_factor;
	}
}

static void widgetbase_set_uniform_alpha_check(
        uiWidgetBase *wtb,
        const bool alpha_check)
{
	const float discard_factor = fabs(wtb->uniform_params.alpha_discard);
	widgetbase_set_uniform_alpha_discard(wtb, alpha_check, discard_factor);
}

static void widgetbase_set_uniform_discard_factor(
        uiWidgetBase *wtb,
        const float discard_factor)
{
	bool alpha_check = wtb->uniform_params.alpha_discard < 0.0f;
	widgetbase_set_uniform_alpha_discard(wtb, alpha_check, discard_factor);
}

static void widgetbase_set_uniform_colors_ubv(
        uiWidgetBase *wtb,
        const uchar *col1, const uchar *col2,
        const uchar *outline,
        const uchar *emboss,
        const uchar *tria,
        const bool alpha_check)
{
	widgetbase_set_uniform_alpha_check(wtb, alpha_check);
	rgba_float_args_set_ch(wtb->uniform_params.color_inner1, col1[0], col1[1], col1[2], col1[3]);
	rgba_float_args_set_ch(wtb->uniform_params.color_inner2, col2[0], col2[1], col2[2], col2[3]);
	rgba_float_args_set_ch(wtb->uniform_params.color_outline, outline[0], outline[1], outline[2], outline[3]);
	rgba_float_args_set_ch(wtb->uniform_params.color_emboss, emboss[0], emboss[1], emboss[2], emboss[3]);
	rgba_float_args_set_ch(wtb->uniform_params.color_tria, tria[0], tria[1], tria[2], tria[3]);
}

/* keep in sync with shader */
#define MAX_WIDGET_BASE_BATCH 6
#define MAX_WIDGET_PARAMETERS 11

static struct {
	GPUBatch *batch; /* Batch type */
	uiWidgetBaseParameters params[MAX_WIDGET_BASE_BATCH];
	int count;
	bool enabled;
} g_widget_base_batch = {0};

void UI_widgetbase_draw_cache_flush(void)
{
	float checker_params[3] = {UI_ALPHA_CHECKER_DARK / 255.0f, UI_ALPHA_CHECKER_LIGHT / 255.0f, 8.0f};

	if (g_widget_base_batch.count == 0)
		return;

	GPUBatch *batch = g_widget_base_batch.batch;
	if (g_widget_base_batch.count == 1) {
		/* draw single */
		GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE);
		GPU_batch_uniform_4fv_array(batch, "parameters", MAX_WIDGET_PARAMETERS, (float *)g_widget_base_batch.params);
		GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
		GPU_batch_draw(batch);
	}
	else {
		GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE_INST);
		GPU_batch_uniform_4fv_array(batch, "parameters", MAX_WIDGET_PARAMETERS * MAX_WIDGET_BASE_BATCH,
		                            (float *)g_widget_base_batch.params);
		GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
		GPU_matrix_bind(batch->interface);
		GPU_batch_draw_range_ex(batch, 0, g_widget_base_batch.count, true);
		GPU_batch_program_use_end(batch);
	}
	g_widget_base_batch.count = 0;
}

void UI_widgetbase_draw_cache_begin(void)
{
	BLI_assert(g_widget_base_batch.enabled == false);
	g_widget_base_batch.enabled = true;
}

void UI_widgetbase_draw_cache_end(void)
{
	BLI_assert(g_widget_base_batch.enabled == true);
	g_widget_base_batch.enabled = false;

	GPU_blend(true);

	UI_widgetbase_draw_cache_flush();

	GPU_blend(false);
}

static void draw_widgetbase_batch(GPUBatch *batch, uiWidgetBase *wtb)
{
	wtb->uniform_params.tria1_size = wtb->tria1.size;
	wtb->uniform_params.tria2_size = wtb->tria2.size;
	copy_v2_v2(wtb->uniform_params.tria1_center, wtb->tria1.center);
	copy_v2_v2(wtb->uniform_params.tria2_center, wtb->tria2.center);

	if (g_widget_base_batch.enabled) {
		if (g_widget_base_batch.batch == NULL) {
			g_widget_base_batch.batch = ui_batch_roundbox_widget_get(ROUNDBOX_TRIA_ARROWS);
		}

		/* draw multi */
		if (batch != g_ui_batch_cache.roundbox_widget[ROUNDBOX_TRIA_NONE] &&
		    batch != g_widget_base_batch.batch)
		{
			/* issue previous calls before changing batch type. */
			UI_widgetbase_draw_cache_flush();
			g_widget_base_batch.batch = batch;
		}

		/* No need to change batch if tria is not visible. Just scale it to 0. */
		if (batch == g_ui_batch_cache.roundbox_widget[ROUNDBOX_TRIA_NONE]) {
			wtb->uniform_params.tria1_size = wtb->uniform_params.tria2_size = 0;
		}

		g_widget_base_batch.params[g_widget_base_batch.count] = wtb->uniform_params;
		g_widget_base_batch.count++;

		if (g_widget_base_batch.count == MAX_WIDGET_BASE_BATCH) {
			UI_widgetbase_draw_cache_flush();
		}
	}
	else {
		float checker_params[3] = {UI_ALPHA_CHECKER_DARK / 255.0f, UI_ALPHA_CHECKER_LIGHT / 255.0f, 8.0f};
		/* draw single */
		GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE);
		GPU_batch_uniform_4fv_array(batch, "parameters", MAX_WIDGET_PARAMETERS, (float *)&wtb->uniform_params);
		GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
		GPU_batch_draw(batch);
	}
}

static void widgetbase_draw_ex(
        uiWidgetBase *wtb, const uiWidgetColors *wcol,
        bool show_alpha_checkers)
{
	uchar inner_col1[4] = {0};
	uchar inner_col2[4] = {0};
	uchar emboss_col[4] = {0};
	uchar outline_col[4] = {0};
	uchar tria_col[4] = {0};
	/* For color widget. */
	if (wcol->shaded != 0) {
		show_alpha_checkers = false;
	}

	GPU_blend(true);

	/* backdrop non AA */
	if (wtb->draw_inner) {
		if (wcol->shaded == 0) {
			/* simple fill */
			inner_col1[0] = inner_col2[0] = (uchar)wcol->inner[0];
			inner_col1[1] = inner_col2[1] = (uchar)wcol->inner[1];
			inner_col1[2] = inner_col2[2] = (uchar)wcol->inner[2];
			inner_col1[3] = inner_col2[3] = (uchar)wcol->inner[3];
		}
		else {
			/* gradient fill */
			shadecolors4((char *)inner_col1, (char *)inner_col2, wcol->inner, wcol->shadetop, wcol->shadedown);
		}
	}

	if (wtb->draw_outline) {
		outline_col[0] = wcol->outline[0];
		outline_col[1] = wcol->outline[1];
		outline_col[2] = wcol->outline[2];
		outline_col[3] = wcol->outline[3] / WIDGET_AA_JITTER;

		/* emboss bottom shadow */
		if (wtb->draw_emboss) {
			UI_GetThemeColor4ubv(TH_WIDGET_EMBOSS, emboss_col);
		}
	}

	if (wtb->tria1.type != ROUNDBOX_TRIA_NONE) {
		tria_col[0] = wcol->item[0];
		tria_col[1] = wcol->item[1];
		tria_col[2] = wcol->item[2];
		tria_col[3] = (uchar)((float)wcol->item[3] / WIDGET_AA_JITTER);
	}

	/* Draw everything in one drawcall */
	if (inner_col1[3] || inner_col2[3] || outline_col[3] || emboss_col[3] || tria_col[3] || show_alpha_checkers) {
		widgetbase_set_uniform_colors_ubv(wtb, inner_col1, inner_col2, outline_col, emboss_col, tria_col, show_alpha_checkers);

		GPUBatch *roundbox_batch = ui_batch_roundbox_widget_get(wtb->tria1.type);
		draw_widgetbase_batch(roundbox_batch, wtb);
	}

	GPU_blend(false);
}

static void widgetbase_draw(uiWidgetBase *wtb, const uiWidgetColors *wcol)
{
	widgetbase_draw_ex(wtb, wcol, false);
}

/* *********************** text/icon ************************************** */

#define UI_TEXT_CLIP_MARGIN (0.25f * U.widget_unit / but->block->aspect)

#define PREVIEW_PAD 4

static void widget_draw_preview(BIFIconID icon, float alpha, const rcti *rect)
{
	int w, h, size;

	if (icon == ICON_NONE)
		return;

	w = BLI_rcti_size_x(rect);
	h = BLI_rcti_size_y(rect);
	size = MIN2(w, h);
	size -= PREVIEW_PAD * 2;  /* padding */

	if (size > 0) {
		int x = rect->xmin + w / 2 - size / 2;
		int y = rect->ymin + h / 2 - size / 2;

		UI_icon_draw_preview_aspect_size(x, y, icon, 1.0f, alpha, size);
	}
}


static int ui_but_draw_menu_icon(const uiBut *but)
{
	return (but->flag & UI_BUT_ICON_SUBMENU) && (but->dt == UI_EMBOSS_PULLDOWN);
}

/* icons have been standardized... and this call draws in untransformed coordinates */

static void widget_draw_icon(
        const uiBut *but, BIFIconID icon, float alpha,
        const rcti *rect, const char mono_color[4])
{
	float xs = 0.0f, ys = 0.0f;
	float aspect, height;

	if (but->flag & UI_BUT_ICON_PREVIEW) {
		GPU_blend(true);
		widget_draw_preview(icon, alpha, rect);
		GPU_blend(false);
		return;
	}

	/* this icon doesn't need draw... */
	if (icon == ICON_BLANK1 && (but->flag & UI_BUT_ICON_SUBMENU) == 0) return;

	aspect = but->block->aspect / UI_DPI_FAC;
	height = ICON_DEFAULT_HEIGHT / aspect;

	/* calculate blend color */
	if (ELEM(but->type, UI_BTYPE_TOGGLE, UI_BTYPE_ROW, UI_BTYPE_TOGGLE_N, UI_BTYPE_LISTROW)) {
		if (but->flag & UI_SELECT) {}
		else if (but->flag & UI_ACTIVE) {}
		else alpha = 0.75f;
	}
	else if ((but->type == UI_BTYPE_LABEL)) {
		/* extra feature allows more alpha blending */
		if (but->a1 == 1.0f) {
			alpha *= but->a2;
		}
	}
	else if (ELEM(but->type, UI_BTYPE_BUT)) {
		if (but->flag & UI_BUT_DISABLED) {
			alpha *= 0.5f;
		}
	}

	GPU_blend(true);

	if (icon && icon != ICON_BLANK1) {
		float ofs = 1.0f / aspect;

		if (but->drawflag & UI_BUT_ICON_LEFT) {
			/* special case - icon_only pie buttons */
			if (ui_block_is_pie_menu(but->block) && !ELEM(but->type, UI_BTYPE_MENU, UI_BTYPE_POPOVER) && but->str && but->str[0] == '\0')
				xs = rect->xmin + 2.0f * ofs;
			else if (but->dt == UI_EMBOSS_NONE || but->type == UI_BTYPE_LABEL)
				xs = rect->xmin + 2.0f * ofs;
			else
				xs = rect->xmin + 4.0f * ofs;
		}
		else {
			xs = (rect->xmin + rect->xmax - height) / 2.0f;
		}
		ys = (rect->ymin + rect->ymax - height) / 2.0f;

		/* force positions to integers, for zoom levels near 1. draws icons crisp. */
		if (aspect > 0.95f && aspect < 1.05f) {
			xs = (int)(xs + 0.1f);
			ys = (int)(ys + 0.1f);
		}

		/* to indicate draggable */
		if (but->dragpoin && (but->flag & UI_ACTIVE)) {
			float rgb[3] = {1.25f, 1.25f, 1.25f};
			UI_icon_draw_aspect_color(xs, ys, icon, aspect, rgb, mono_color);
		}
		else if ((but->flag & (UI_ACTIVE | UI_SELECT | UI_SELECT_DRAW)) || !UI_but_is_tool(but)) {
			UI_icon_draw_aspect(xs, ys, icon, aspect, alpha, mono_color);
		}
		else {
			const bTheme *btheme = UI_GetTheme();
			UI_icon_draw_desaturate(xs, ys, icon, aspect, alpha, 1.0 - btheme->tui.icon_saturation, mono_color);
		}
	}

	GPU_blend(false);
}

static void widget_draw_submenu_tria(const uiBut *but, const rcti *rect, const uiWidgetColors *wcol)
{
	const float aspect = but->block->aspect / UI_DPI_FAC;
	const int tria_height = (int)(ICON_DEFAULT_HEIGHT / aspect);
	const int tria_width = (int)(ICON_DEFAULT_WIDTH / aspect) - 2 * U.pixelsize;
	const int xs = rect->xmax - tria_width;
	const int ys = (rect->ymin + rect->ymax - tria_height) / 2.0f;
	float col[4];
	rctf tria_rect;

	rgba_uchar_to_float(col, (const uchar *)wcol->text);
	col[3] *= 0.8f;

	BLI_rctf_init(&tria_rect, xs, xs + tria_width, ys, ys + tria_height);
	BLI_rctf_scale(&tria_rect, 0.4f);

	GPU_blend(true);
	UI_widgetbase_draw_cache_flush();
	GPU_blend(false);
	ui_draw_anti_tria_rect(&tria_rect, 'h', col);
}

static void ui_text_clip_give_prev_off(uiBut *but, const char *str)
{
	const char *prev_utf8 = BLI_str_find_prev_char_utf8(str, str + but->ofs);
	int bytes = str + but->ofs - prev_utf8;

	but->ofs -= bytes;
}

static void ui_text_clip_give_next_off(uiBut *but, const char *str)
{
	const char *next_utf8 = BLI_str_find_next_char_utf8(str + but->ofs, NULL);
	int bytes = next_utf8 - (str + but->ofs);

	but->ofs += bytes;
}

/**
 * Helper.
 * This func assumes things like kerning handling have already been handled!
 * Return the length of modified (right-clipped + ellipsis) string.
 */
static void ui_text_clip_right_ex(
        const uiFontStyle *fstyle, char *str, const size_t max_len, const float okwidth,
        const char *sep, const int sep_len, const float sep_strwidth, size_t *r_final_len)
{
	float tmp;
	int l_end;

	BLI_assert(str[0]);

	/* If the trailing ellipsis takes more than 20% of all available width, just cut the string
	 * (as using the ellipsis would remove even more useful chars, and we cannot show much already!).
	 */
	if (sep_strwidth / okwidth > 0.2f) {
		l_end = BLF_width_to_strlen(fstyle->uifont_id, str, max_len, okwidth, &tmp);
		str[l_end] = '\0';
		if (r_final_len) {
			*r_final_len = (size_t)l_end;
		}
	}
	else {
		l_end = BLF_width_to_strlen(fstyle->uifont_id, str, max_len, okwidth - sep_strwidth, &tmp);
		memcpy(str + l_end, sep, sep_len + 1);  /* +1 for trailing '\0'. */
		if (r_final_len) {
			*r_final_len = (size_t)(l_end + sep_len);
		}
	}
}

/**
 * Cut off the middle of the text to fit into the given width.
 * Note in case this middle clipping would just remove a few chars, it rather clips right, which is more readable.
 * If rpart_sep is not Null, the part of str starting to first occurrence of rpart_sep is preserved at all cost (useful
 * for strings with shortcuts, like 'AVeryLongFooBarLabelForMenuEntry|Ctrl O' -> 'AVeryLong...MenuEntry|Ctrl O').
 */
float UI_text_clip_middle_ex(
        const uiFontStyle *fstyle, char *str, float okwidth, const float minwidth,
        const size_t max_len, const char rpart_sep)
{
	float strwidth;

	/* Add some epsilon to OK width, avoids 'ellipsing' text that nearly fits!
	 * Better to have a small piece of the last char cut out,
	 * than two remaining chars replaced by an ellipsis... */
	okwidth += 1.0f + UI_DPI_FAC;

	BLI_assert(str[0]);

	/* need to set this first */
	UI_fontstyle_set(fstyle);

	if (fstyle->kerning == 1) {  /* for BLF_width */
		BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
	}

	strwidth = BLF_width(fstyle->uifont_id, str, max_len);

	if ((okwidth > 0.0f) && (strwidth > okwidth)) {
		/* utf8 two-dots leader '..' (shorter than ellipsis '...'),
		 * some compilers complain with real litteral string. */
		const char sep[] = {0xe2, 0x80, 0xA5, 0x0};
		const int sep_len = sizeof(sep) - 1;
		const float sep_strwidth = BLF_width(fstyle->uifont_id, sep, sep_len + 1);
		float parts_strwidth;
		size_t l_end;

		char *rpart = NULL, rpart_buf[UI_MAX_DRAW_STR];
		float rpart_width = 0.0f;
		size_t rpart_len = 0;
		size_t final_lpart_len;

		if (rpart_sep) {
			rpart = strrchr(str, rpart_sep);

			if (rpart) {
				rpart_len = strlen(rpart);
				rpart_width = BLF_width(fstyle->uifont_id, rpart, rpart_len);
				okwidth -= rpart_width;
				strwidth -= rpart_width;

				if (okwidth < 0.0f) {
					/* Not enough place for actual label, just display protected right part.
					 * Here just for safety, should never happen in real life! */
					memmove(str, rpart, rpart_len + 1);
					rpart = NULL;
					okwidth += rpart_width;
					strwidth = rpart_width;
				}
			}
		}

		parts_strwidth = (okwidth - sep_strwidth) / 2.0f;

		if (rpart) {
			strcpy(rpart_buf, rpart);
			*rpart = '\0';
			rpart = rpart_buf;
		}

		l_end = BLF_width_to_strlen(fstyle->uifont_id, str, max_len, parts_strwidth, NULL);
		if (l_end < 10 || min_ff(parts_strwidth, strwidth - okwidth) < minwidth) {
			/* If we really have no place, or we would clip a very small piece of string in the middle,
			 * only show start of string.
			 */
			ui_text_clip_right_ex(fstyle, str, max_len, okwidth, sep, sep_len, sep_strwidth, &final_lpart_len);
		}
		else {
			size_t r_offset, r_len;

			r_offset = BLF_width_to_rstrlen(fstyle->uifont_id, str, max_len, parts_strwidth, NULL);
			r_len = strlen(str + r_offset) + 1;  /* +1 for the trailing '\0'. */

			if (l_end + sep_len + r_len + rpart_len > max_len) {
				/* Corner case, the str already takes all available mem, and the ellipsis chars would actually
				 * add more chars...
				 * Better to just trim one or two letters to the right in this case...
				 * Note: with a single-char ellipsis, this should never happen! But better be safe here...
				 */
				ui_text_clip_right_ex(fstyle, str, max_len, okwidth, sep, sep_len, sep_strwidth, &final_lpart_len);
			}
			else {
				memmove(str + l_end + sep_len, str + r_offset, r_len);
				memcpy(str + l_end, sep, sep_len);
				/* -1 to remove trailing '\0'! */
				final_lpart_len = (size_t)(l_end + sep_len + r_len - 1);

				while (BLF_width(fstyle->uifont_id, str, max_len) > okwidth) {
					/* This will happen because a lot of string width processing is done in integer pixels,
					 * which can introduce a rather high error in the end (about 2 pixels or so).
					 * Only one char removal shall ever be needed in real-life situation... */
					r_len--;
					final_lpart_len--;
					char *c = str + l_end + sep_len;
					memmove(c, c + 1, r_len);
				}
			}
		}

		if (rpart) {
			/* Add back preserved right part to our shorten str. */
			memcpy(str + final_lpart_len, rpart, rpart_len + 1);  /* +1 for trailing '\0'. */
			okwidth += rpart_width;
		}

		strwidth = BLF_width(fstyle->uifont_id, str, max_len);
	}

	if (fstyle->kerning == 1) {
		BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
	}

	BLI_assert(strwidth <= okwidth);

	return strwidth;
}

/**
 * Wrapper around UI_text_clip_middle_ex.
 */
static void ui_text_clip_middle(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
	/* No margin for labels! */
	const int border = ELEM(but->type, UI_BTYPE_LABEL, UI_BTYPE_MENU, UI_BTYPE_POPOVER) ? 0 : (int)(UI_TEXT_CLIP_MARGIN + 0.5f);
	const float okwidth = (float)max_ii(BLI_rcti_size_x(rect) - border, 0);
	const size_t max_len = sizeof(but->drawstr);
	const float minwidth = (float)(UI_DPI_ICON_SIZE) / but->block->aspect * 2.0f;

	but->ofs = 0;
	but->strwidth = UI_text_clip_middle_ex(fstyle, but->drawstr, okwidth, minwidth, max_len, '\0');
}

/**
 * Like ui_text_clip_middle(), but protect/preserve at all cost the right part of the string after sep.
 * Useful for strings with shortcuts (like 'AVeryLongFooBarLabelForMenuEntry|Ctrl O' -> 'AVeryLong...MenuEntry|Ctrl O').
 */
static void ui_text_clip_middle_protect_right(const uiFontStyle *fstyle, uiBut *but, const rcti *rect, const char rsep)
{
	/* No margin for labels! */
	const int border = ELEM(but->type, UI_BTYPE_LABEL, UI_BTYPE_MENU, UI_BTYPE_POPOVER) ? 0 : (int)(UI_TEXT_CLIP_MARGIN + 0.5f);
	const float okwidth = (float)max_ii(BLI_rcti_size_x(rect) - border, 0);
	const size_t max_len = sizeof(but->drawstr);
	const float minwidth = (float)(UI_DPI_ICON_SIZE) / but->block->aspect * 2.0f;

	but->ofs = 0;
	but->strwidth = UI_text_clip_middle_ex(fstyle, but->drawstr, okwidth, minwidth, max_len, rsep);
}

/**
 * Cut off the text, taking into account the cursor location (text display while editing).
 */
static void ui_text_clip_cursor(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
	const int border = (int)(UI_TEXT_CLIP_MARGIN + 0.5f);
	const int okwidth = max_ii(BLI_rcti_size_x(rect) - border, 0);

	BLI_assert(but->editstr && but->pos >= 0);

	/* need to set this first */
	UI_fontstyle_set(fstyle);

	if (fstyle->kerning == 1) /* for BLF_width */
		BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);

	/* define ofs dynamically */
	if (but->ofs > but->pos)
		but->ofs = but->pos;

	if (BLF_width(fstyle->uifont_id, but->editstr, INT_MAX) <= okwidth)
		but->ofs = 0;

	but->strwidth = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, INT_MAX);

	if (but->strwidth > okwidth) {
		int len = strlen(but->editstr);

		while (but->strwidth > okwidth) {
			float width;

			/* string position of cursor */
			width = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, (but->pos - but->ofs));

			/* if cursor is at 20 pixels of right side button we clip left */
			if (width > okwidth - 20) {
				ui_text_clip_give_next_off(but, but->editstr);
			}
			else {
				int bytes;
				/* shift string to the left */
				if (width < 20 && but->ofs > 0)
					ui_text_clip_give_prev_off(but, but->editstr);
				bytes = BLI_str_utf8_size(BLI_str_find_prev_char_utf8(but->editstr, but->editstr + len));
				if (bytes == -1)
					bytes = 1;
				len -= bytes;
			}

			but->strwidth = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, len - but->ofs);

			if (but->strwidth < 10) break;
		}
	}

	if (fstyle->kerning == 1) {
		BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
	}
}

/**
 * Cut off the end of text to fit into the width of \a rect.
 *
 * \note deals with ': ' especially for number buttons
 */
static void ui_text_clip_right_label(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
	const int border = UI_TEXT_CLIP_MARGIN + 1;
	const int okwidth = max_ii(BLI_rcti_size_x(rect) - border, 0);
	char *cpoin = NULL;
	int drawstr_len = strlen(but->drawstr);
	const char *cpend = but->drawstr + drawstr_len;

	/* need to set this first */
	UI_fontstyle_set(fstyle);

	if (fstyle->kerning == 1) /* for BLF_width */
		BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);

	but->strwidth = BLF_width(fstyle->uifont_id, but->drawstr, sizeof(but->drawstr));
	but->ofs = 0;


	/* First shorten num-buttons eg,
	 *   Translucency: 0.000
	 * becomes
	 *   Trans: 0.000
	 */

	/* find the space after ':' separator */
	cpoin = strrchr(but->drawstr, ':');

	if (cpoin && (cpoin < cpend - 2)) {
		char *cp2 = cpoin;

		/* chop off the leading text, starting from the right */
		while (but->strwidth > okwidth && cp2 > but->drawstr) {
			const char *prev_utf8 = BLI_str_find_prev_char_utf8(but->drawstr, cp2);
			int bytes = cp2 - prev_utf8;

			/* shift the text after and including cp2 back by 1 char,
			 * +1 to include null terminator */
			memmove(cp2 - bytes, cp2, drawstr_len + 1);
			cp2 -= bytes;

			drawstr_len -= bytes;
			// BLI_assert(strlen(but->drawstr) == drawstr_len);

			but->strwidth = BLF_width(fstyle->uifont_id, but->drawstr + but->ofs, sizeof(but->drawstr) - but->ofs);
			if (but->strwidth < 10) break;
		}


		/* after the leading text is gone, chop off the : and following space, with ofs */
		while ((but->strwidth > okwidth) && (but->ofs < 2)) {
			ui_text_clip_give_next_off(but, but->drawstr);
			but->strwidth = BLF_width(fstyle->uifont_id, but->drawstr + but->ofs, sizeof(but->drawstr) - but->ofs);
			if (but->strwidth < 10) break;
		}
	}


	/* Now just remove trailing chars */
	/* once the label's gone, chop off the least significant digits */
	if (but->strwidth > okwidth) {
		float strwidth;
		drawstr_len = BLF_width_to_strlen(
		        fstyle->uifont_id, but->drawstr + but->ofs,
		        drawstr_len - but->ofs, okwidth, &strwidth) + but->ofs;
		but->strwidth = strwidth;
		but->drawstr[drawstr_len] = 0;
	}

	if (fstyle->kerning == 1)
		BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
}

#ifdef WITH_INPUT_IME
static void widget_draw_text_ime_underline(
        uiFontStyle *fstyle, uiWidgetColors *wcol, uiBut *but, const rcti *rect,
        const wmIMEData *ime_data, const char *drawstr)
{
	int ofs_x, width;
	int rect_x = BLI_rcti_size_x(rect);
	int sel_start = ime_data->sel_start, sel_end = ime_data->sel_end;
	float fcol[4];

	if (drawstr[0] != 0) {
		if (but->pos >= but->ofs) {
			ofs_x = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->pos - but->ofs);
		}
		else {
			ofs_x = 0;
		}

		width = BLF_width(
		        fstyle->uifont_id, drawstr + but->ofs,
		        ime_data->composite_len + but->pos - but->ofs);

		rgba_uchar_to_float(fcol, wcol->text);
		UI_draw_text_underline(rect->xmin + ofs_x, rect->ymin + 6 * U.pixelsize, min_ii(width, rect_x - 2) - ofs_x, 1, fcol);

		/* draw the thick line */
		if (sel_start != -1 && sel_end != -1) {
			sel_end -= sel_start;
			sel_start += but->pos;

			if (sel_start >= but->ofs) {
				ofs_x = BLF_width(fstyle->uifont_id, drawstr + but->ofs, sel_start - but->ofs);
			}
			else {
				ofs_x = 0;
			}

			width = BLF_width(
			        fstyle->uifont_id, drawstr + but->ofs,
			        sel_end + sel_start - but->ofs);

			UI_draw_text_underline(rect->xmin + ofs_x, rect->ymin + 6 * U.pixelsize, min_ii(width, rect_x - 2) - ofs_x, 2, fcol);
		}
	}
}
#endif  /* WITH_INPUT_IME */

static void widget_draw_text(const uiFontStyle *fstyle, const uiWidgetColors *wcol, uiBut *but, rcti *rect)
{
	int drawstr_left_len = UI_MAX_DRAW_STR;
	const char *drawstr = but->drawstr;
	const char *drawstr_right = NULL;
	bool use_right_only = false;

#ifdef WITH_INPUT_IME
	const wmIMEData *ime_data;
#endif

	UI_fontstyle_set(fstyle);

	eFontStyle_Align align;
	if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
		align = UI_STYLE_TEXT_LEFT;
	}
	else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
		align = UI_STYLE_TEXT_RIGHT;
	}
	else {
		align = UI_STYLE_TEXT_CENTER;
	}

	if (fstyle->kerning == 1) /* for BLF_width */
		BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);


	/* Special case: when we're entering text for multiple buttons,
	 * don't draw the text for any of the multi-editing buttons */
	if (UNLIKELY(but->flag & UI_BUT_DRAG_MULTI)) {
		uiBut *but_edit = ui_but_drag_multi_edit_get(but);
		if (but_edit) {
			drawstr = but_edit->editstr;
			align = UI_STYLE_TEXT_LEFT;
		}
	}
	else {
		if (but->editstr) {
			/* max length isn't used in this case,
			 * we rely on string being NULL terminated. */
			drawstr_left_len = INT_MAX;

#ifdef WITH_INPUT_IME
			/* FIXME, IME is modifying 'const char *drawstr! */
			ime_data = ui_but_ime_data_get(but);

			if (ime_data && ime_data->composite_len) {
				/* insert composite string into cursor pos */
				BLI_snprintf(
				        (char *)drawstr, UI_MAX_DRAW_STR, "%s%s%s",
				        but->editstr, ime_data->str_composite,
				        but->editstr + but->pos);
			}
			else
#endif
			{
				drawstr = but->editstr;
			}
		}
	}


	/* text button selection, cursor, composite underline */
	if (but->editstr && but->pos != -1) {
		int but_pos_ofs;
		int tx, ty;

		/* text button selection */
		if ((but->selend - but->selsta) > 0) {
			int selsta_draw, selwidth_draw;

			if (drawstr[0] != 0) {
				/* We are drawing on top of widget bases. Flush cache. */
				GPU_blend(true);
				UI_widgetbase_draw_cache_flush();
				GPU_blend(false);

				if (but->selsta >= but->ofs) {
					selsta_draw = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->selsta - but->ofs);
				}
				else {
					selsta_draw = 0;
				}

				selwidth_draw = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->selend - but->ofs);

				uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
				immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

				immUniformColor4ubv((uchar *)wcol->item);
				immRecti(pos, rect->xmin + selsta_draw,
				         rect->ymin + 2,
				         min_ii(rect->xmin + selwidth_draw, rect->xmax - 2),
				         rect->ymax - 2);

				immUnbindProgram();
			}
		}

		/* text cursor */
		but_pos_ofs = but->pos;

#ifdef WITH_INPUT_IME
		/* if is ime compositing, move the cursor */
		if (ime_data && ime_data->composite_len && ime_data->cursor_pos != -1) {
			but_pos_ofs += ime_data->cursor_pos;
		}
#endif

		if (but->pos >= but->ofs) {
			int t;
			if (drawstr[0] != 0) {
				t = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but_pos_ofs - but->ofs);
			}
			else {
				t = 0;
			}
			/* We are drawing on top of widget bases. Flush cache. */
			GPU_blend(true);
			UI_widgetbase_draw_cache_flush();
			GPU_blend(false);

			uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
			immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

			immUniformColor3f(0.2f, 0.6f, 0.9f);

			tx = rect->xmin + t + 2;
			ty = rect->ymin + 2;

			/* draw cursor */
			immRecti(pos, rect->xmin + t, ty, tx, rect->ymax - 2);

			immUnbindProgram();
		}

#ifdef WITH_INPUT_IME
		if (ime_data && ime_data->composite_len) {
			/* ime cursor following */
			if (but->pos >= but->ofs) {
				ui_but_ime_reposition(but, tx + 5, ty + 3, false);
			}

			/* composite underline */
			widget_draw_text_ime_underline(fstyle, wcol, but, rect, ime_data, drawstr);
		}
#endif
	}

	if (fstyle->kerning == 1)
		BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);

#if 0
	ui_rasterpos_safe(x, y, but->aspect);
	transopts = ui_translate_buttons();
#endif

	/* cut string in 2 parts - only for menu entries */
	if ((but->drawflag & UI_BUT_HAS_SHORTCUT) &&
	    (but->editstr == NULL))
	{
		if (but->flag & UI_BUT_HAS_SEP_CHAR) {
			drawstr_right = strrchr(drawstr, UI_SEP_CHAR);
			if (drawstr_right) {
				drawstr_left_len = (drawstr_right - drawstr);
				drawstr_right++;
			}
		}
	}

#ifdef USE_NUMBUTS_LR_ALIGN
	if (!drawstr_right &&
	    (but->drawflag & UI_BUT_TEXT_LEFT) &&
	    ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER) &&
	    /* if we're editing or multi-drag (fake editing), then use left alignment */
	    (but->editstr == NULL) && (drawstr == but->drawstr))
	{
		drawstr_right = strchr(drawstr + but->ofs, ':');
		if (drawstr_right) {
			drawstr_right++;
			drawstr_left_len = (drawstr_right - drawstr);

			while (*drawstr_right == ' ') {
				drawstr_right++;
			}
		}
		else {
			/* no prefix, even so use only cpoin */
			drawstr_right = drawstr + but->ofs;
			use_right_only = true;
		}
	}
#endif

	if (!use_right_only) {
		/* for underline drawing */
		float font_xofs, font_yofs;

		int drawlen = (drawstr_left_len == INT_MAX) ? strlen(drawstr + but->ofs) : (drawstr_left_len - but->ofs);

		if (drawlen > 0) {
			UI_fontstyle_draw_ex(
			        fstyle, rect, drawstr + but->ofs, (uchar *)wcol->text,
			        &(struct uiFontStyleDraw_Params) { .align = align, },
			        drawlen, &font_xofs, &font_yofs);

			if (but->menu_key != '\0') {
				char fixedbuf[128];
				const char *str;

				BLI_strncpy(fixedbuf, drawstr + but->ofs, min_ii(sizeof(fixedbuf), drawlen));

				str = strchr(fixedbuf, but->menu_key - 32); /* upper case */
				if (str == NULL)
					str = strchr(fixedbuf, but->menu_key);

				if (str) {
					int ul_index = -1;
					float ul_advance;

					ul_index = (int)(str - fixedbuf);

					if (fstyle->kerning == 1) {
						BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
					}

					fixedbuf[ul_index] = '\0';
					ul_advance = BLF_width(fstyle->uifont_id, fixedbuf, ul_index) + (1.0f * UI_DPI_FAC);

					BLF_position(fstyle->uifont_id, rect->xmin + font_xofs + ul_advance, rect->ymin + font_yofs, 0.0f);
					BLF_color4ubv(fstyle->uifont_id, (uchar *)wcol->text);
					BLF_draw(fstyle->uifont_id, "_", 2);

					if (fstyle->kerning == 1) {
						BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
					}
				}
			}
		}
	}

	/* part text right aligned */
	if (drawstr_right) {
		char col[4];
		copy_v4_v4_char(col, wcol->text);
		if (but->drawflag & UI_BUT_HAS_SHORTCUT) {
			col[3] *= 0.5f;
		}

		rect->xmax -= UI_TEXT_CLIP_MARGIN;
		UI_fontstyle_draw(
		        fstyle, rect, drawstr_right, (const uchar *)col,
		        &(struct uiFontStyleDraw_Params) { .align = UI_STYLE_TEXT_RIGHT, });
	}
}

static BIFIconID widget_icon_id(uiBut *but)
{
	if (!(but->flag & UI_HAS_ICON)) {
		return ICON_NONE;
	}

	/* Consecutive icons can be toggle between. */
	if (but->drawflag & UI_BUT_ICON_REVERSE) {
		return but->icon - but->iconadd;
	}
	else {
		return but->icon + but->iconadd;
	}
}

/* draws text and icons for buttons */
static void widget_draw_text_icon(const uiFontStyle *fstyle, const uiWidgetColors *wcol, uiBut *but, rcti *rect)
{
	const uiButExtraIconType extra_icon_type = ui_but_icon_extra_get(but);
	const bool show_menu_icon = ui_but_draw_menu_icon(but);
	float alpha = (float)wcol->text[3] / 255.0f;
	char password_str[UI_MAX_DRAW_STR];

	ui_but_text_password_hide(password_str, but, false);

	/* check for button text label */
	if (ELEM(but->type, UI_BTYPE_MENU, UI_BTYPE_POPOVER) && (but->flag & UI_BUT_NODE_LINK)) {
		rcti temp = *rect;
		temp.xmin = rect->xmax - BLI_rcti_size_y(rect) - 1;
		widget_draw_icon(but, ICON_LAYER_USED, alpha, &temp, wcol->text);
		rect->xmax = temp.xmin;
	}

	/* If there's an icon too (made with uiDefIconTextBut) then draw the icon
	 * and offset the text label to accommodate it */

	/* Big previews with optional text label below */
	if (but->flag & UI_BUT_ICON_PREVIEW && ui_block_is_menu(but->block)) {
		const BIFIconID icon = widget_icon_id(but);
		int icon_size = BLI_rcti_size_y(rect);
		int text_size = 0;

		/* This is a bit britle, but avoids adding an 'UI_BUT_HAS_LABEL' flag to but... */
		if (icon_size > BLI_rcti_size_x(rect)) {
			/* button is not square, it has extra height for label */
			text_size = UI_UNIT_Y;
			icon_size -= text_size;
		}

		/* draw icon in rect above the space reserved for the label */
		rect->ymin += text_size;
		GPU_blend(true);
		widget_draw_preview(icon, alpha, rect);
		GPU_blend(false);

		/* offset rect to draw label in */
		rect->ymin -= text_size;
		rect->ymax -= icon_size;

		/* vertically centering text */
		rect->ymin += UI_UNIT_Y / 2;
	}
	/* Icons on the left with optional text label on the right */
	else if (but->flag & UI_HAS_ICON || show_menu_icon) {
		const bool is_tool = UI_but_is_tool(but);

		/* XXX add way to draw icons at a different size!
		 * Use small icons for popup. */
#ifdef USE_UI_TOOLBAR_HACK
		const float aspect_orig = but->block->aspect;
		if (is_tool && (but->block->flag & UI_BLOCK_POPOVER)) {
			but->block->aspect *= 2.0f;
		}
#endif

		const BIFIconID icon = widget_icon_id(but);
		int icon_size_init = is_tool ? ICON_DEFAULT_HEIGHT_TOOLBAR : ICON_DEFAULT_HEIGHT;
		const float icon_size = icon_size_init / (but->block->aspect / UI_DPI_FAC);
		const float icon_padding = 2 * UI_DPI_FAC;

#ifdef USE_UI_TOOLBAR_HACK
		if (is_tool) {
			/* pass (even if its a menu toolbar) */
			but->drawflag |= UI_BUT_TEXT_LEFT;
			but->drawflag |= UI_BUT_ICON_LEFT;
		}
#endif

		/* menu item - add some more padding so menus don't feel cramped. it must
		 * be part of the button so that this area is still clickable */
		if (is_tool) {
			/* pass (even if its a menu toolbar) */
		}
		else if (ui_block_is_pie_menu(but->block)) {
			if (but->dt == UI_EMBOSS_RADIAL)
				rect->xmin += 0.3f * U.widget_unit;
		}
		else if (ui_block_is_menu(but->block))
			rect->xmin += 0.2f * U.widget_unit;

		widget_draw_icon(but, icon, alpha, rect, wcol->text);
		if (show_menu_icon) {
			BLI_assert(but->block->content_hints & UI_BLOCK_CONTAINS_SUBMENU_BUT);
			widget_draw_submenu_tria(but, rect, wcol);
		}

#ifdef USE_UI_TOOLBAR_HACK
		but->block->aspect = aspect_orig;
#endif

		rect->xmin += icon_size + icon_padding;
	}

	if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
		rect->xmin += (UI_TEXT_MARGIN_X * U.widget_unit) / but->block->aspect;
	}
	else if ((but->drawflag & UI_BUT_TEXT_RIGHT)) {
		rect->xmax -= (UI_TEXT_MARGIN_X * U.widget_unit) / but->block->aspect;
	}

	/* Menu contains sub-menu items with triangle icon on their right. Shortcut
	 * strings should be drawn with some padding to the right then. */
	if (ui_block_is_menu(but->block) && (but->block->content_hints & UI_BLOCK_CONTAINS_SUBMENU_BUT)) {
		rect->xmax -= UI_MENU_SUBMENU_PADDING;
	}

	/* extra icons, e.g. 'x' icon to clear text or icon for eyedropper */
	if (extra_icon_type != UI_BUT_ICONEXTRA_NONE) {
		rcti temp = *rect;

		temp.xmin = temp.xmax - (BLI_rcti_size_y(rect) * 1.08f);

		if (extra_icon_type == UI_BUT_ICONEXTRA_CLEAR) {
			widget_draw_icon(but, ICON_PANEL_CLOSE, alpha, &temp, wcol->text);
		}
		else if (extra_icon_type == UI_BUT_ICONEXTRA_EYEDROPPER) {
			widget_draw_icon(but, ICON_EYEDROPPER, alpha, &temp, wcol->text);
		}
		else {
			BLI_assert(0);
		}

		rect->xmax -= ICON_SIZE_FROM_BUTRECT(rect);
	}

	/* clip but->drawstr to fit in available space */
	if (but->editstr && but->pos >= 0) {
		ui_text_clip_cursor(fstyle, but, rect);
	}
	else if (but->drawstr[0] == '\0') {
		/* bypass text clipping on icon buttons */
		but->ofs = 0;
		but->strwidth = 0;
	}
	else if (ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER)) {
		ui_text_clip_right_label(fstyle, but, rect);
	}
	else if (but->flag & UI_BUT_HAS_SEP_CHAR) {
		/* Clip middle, but protect in all case right part containing the shortcut, if any. */
		ui_text_clip_middle_protect_right(fstyle, but, rect, UI_SEP_CHAR);
	}
	else {
		ui_text_clip_middle(fstyle, but, rect);
	}

	/* always draw text for textbutton cursor */
	widget_draw_text(fstyle, wcol, but, rect);

	ui_but_text_password_hide(password_str, but, true);

	/* if a widget uses font shadow it has to be deactivated now */
	BLF_disable(fstyle->uifont_id, BLF_SHADOW);
}

#undef UI_TEXT_CLIP_MARGIN


/* *********************** widget types ************************************* */

/* ************ button callbacks, state ***************** */

static void widget_state_blend(char cp[3], const char cpstate[3], const float fac)
{
	if (fac != 0.0f) {
		cp[0] = (int)((1.0f - fac) * cp[0] + fac * cpstate[0]);
		cp[1] = (int)((1.0f - fac) * cp[1] + fac * cpstate[1]);
		cp[2] = (int)((1.0f - fac) * cp[2] + fac * cpstate[2]);
	}
}

/* put all widget colors on half alpha, use local storage */
static void ui_widget_color_disabled(uiWidgetType *wt)
{
	static uiWidgetColors wcol_theme_s;

	wcol_theme_s = *wt->wcol_theme;

	wcol_theme_s.outline[3] *= 0.5;
	wcol_theme_s.inner[3] *= 0.5;
	wcol_theme_s.inner_sel[3] *= 0.5;
	wcol_theme_s.item[3] *= 0.5;
	wcol_theme_s.text[3] *= 0.5;
	wcol_theme_s.text_sel[3] *= 0.5;

	wt->wcol_theme = &wcol_theme_s;
}

static void widget_active_color(char cp[3])
{
	cp[0] = cp[0] >= 240 ? 255 : cp[0] + 15;
	cp[1] = cp[1] >= 240 ? 255 : cp[1] + 15;
	cp[2] = cp[2] >= 240 ? 255 : cp[2] + 15;
}

/* copy colors from theme, and set changes in it based on state */
static void widget_state(uiWidgetType *wt, int state, int drawflag)
{
	uiWidgetStateColors *wcol_state = wt->wcol_state;

	if ((state & UI_BUT_LIST_ITEM) && !(state & UI_STATE_TEXT_INPUT)) {
		/* Override default widget's colors. */
		bTheme *btheme = UI_GetTheme();
		wt->wcol_theme = &btheme->tui.wcol_list_item;

		if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
			ui_widget_color_disabled(wt);
		}
	}

	wt->wcol = *(wt->wcol_theme);

	if (state & UI_SELECT) {
		copy_v4_v4_char(wt->wcol.inner, wt->wcol.inner_sel);
		if (drawflag & UI_BUT_ANIMATED_CHANGED)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_changed_sel, wcol_state->blend);
		else if (state & UI_BUT_ANIMATED_KEY)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_key_sel, wcol_state->blend);
		else if (state & UI_BUT_ANIMATED)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_anim_sel, wcol_state->blend);
		else if (state & UI_BUT_DRIVEN)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_driven_sel, wcol_state->blend);
		else if (state & UI_BUT_OVERRIDEN)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_overridden_sel, wcol_state->blend);

		copy_v3_v3_char(wt->wcol.text, wt->wcol.text_sel);

		if (state & UI_SELECT)
			SWAP(short, wt->wcol.shadetop, wt->wcol.shadedown);
	}
	else {
		if (drawflag & UI_BUT_ANIMATED_CHANGED)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_changed, wcol_state->blend);
		else if (state & UI_BUT_ANIMATED_KEY)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_key, wcol_state->blend);
		else if (state & UI_BUT_ANIMATED)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_anim, wcol_state->blend);
		else if (state & UI_BUT_DRIVEN)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_driven, wcol_state->blend);
		else if (state & UI_BUT_OVERRIDEN)
			widget_state_blend(wt->wcol.inner, wcol_state->inner_overridden, wcol_state->blend);

		if (state & UI_ACTIVE) { /* mouse over? */
			widget_active_color(wt->wcol.inner);
		}
	}

	if (state & UI_BUT_REDALERT) {
		char red[4] = {255, 0, 0};
		if (wt->draw) {
			widget_state_blend(wt->wcol.inner, red, 0.4f);
		}
		else {
			widget_state_blend(wt->wcol.text, red, 0.4f);
		}
	}

	if (state & UI_BUT_DRAG_MULTI) {
		/* the button isn't SELECT but we're editing this so draw with sel color */
		copy_v4_v4_char(wt->wcol.inner, wt->wcol.inner_sel);
		SWAP(short, wt->wcol.shadetop, wt->wcol.shadedown);
		widget_state_blend(wt->wcol.text, wt->wcol.text_sel, 0.85f);
	}

	if (state & UI_BUT_NODE_ACTIVE) {
		char blue[4] = {86, 128, 194};
		widget_state_blend(wt->wcol.inner, blue, 0.3f);
	}
}

/* sliders use special hack which sets 'item' as inner when drawing filling */
static void widget_state_numslider(uiWidgetType *wt, int state, int drawflag)
{
	uiWidgetStateColors *wcol_state = wt->wcol_state;
	/* XXX special tweak to make sure that bar will still be visible */
	float blend = wcol_state->blend - 0.2f;

	/* call this for option button */
	widget_state(wt, state, drawflag);

	/* now, set the inner-part so that it reflects state settings too */
	/* TODO: maybe we should have separate settings for the blending colors used for this case? */
	if (state & UI_SELECT) {

		if (drawflag & UI_BUT_ANIMATED_CHANGED)
			widget_state_blend(wt->wcol.item, wcol_state->inner_changed_sel, blend);
		else if (state & UI_BUT_ANIMATED_KEY)
			widget_state_blend(wt->wcol.item, wcol_state->inner_key_sel, blend);
		else if (state & UI_BUT_ANIMATED)
			widget_state_blend(wt->wcol.item, wcol_state->inner_anim_sel, blend);
		else if (state & UI_BUT_DRIVEN)
			widget_state_blend(wt->wcol.item, wcol_state->inner_driven_sel, blend);
		else if (state & UI_BUT_OVERRIDEN)
			widget_state_blend(wt->wcol.item, wcol_state->inner_overridden_sel, blend);

		if (state & UI_SELECT)
			SWAP(short, wt->wcol.shadetop, wt->wcol.shadedown);
	}
	else {
		if (drawflag & UI_BUT_ANIMATED_CHANGED)
			widget_state_blend(wt->wcol.item, wcol_state->inner_changed, blend);
		else if (state & UI_BUT_ANIMATED_KEY)
			widget_state_blend(wt->wcol.item, wcol_state->inner_key, blend);
		else if (state & UI_BUT_ANIMATED)
			widget_state_blend(wt->wcol.item, wcol_state->inner_anim, blend);
		else if (state & UI_BUT_DRIVEN)
			widget_state_blend(wt->wcol.item, wcol_state->inner_driven, blend);
		else if (state & UI_BUT_OVERRIDEN)
			widget_state_blend(wt->wcol.item, wcol_state->inner_overridden, blend);
	}
}

/* labels use theme colors for text */
static void widget_state_option_menu(uiWidgetType *wt, int state, int drawflag)
{
	bTheme *btheme = UI_GetTheme(); /* XXX */

	/* call this for option button */
	widget_state(wt, state, drawflag);

	/* if not selected we get theme from menu back */
	if (state & UI_SELECT)
		copy_v3_v3_char(wt->wcol.text, btheme->tui.wcol_menu_back.text_sel);
	else
		copy_v3_v3_char(wt->wcol.text, btheme->tui.wcol_menu_back.text);
}


static void widget_state_nothing(uiWidgetType *wt, int UNUSED(state), int UNUSED(drawflag))
{
	wt->wcol = *(wt->wcol_theme);
}

/* special case, button that calls pulldown */
static void widget_state_pulldown(uiWidgetType *wt, int UNUSED(state), int UNUSED(drawflag))
{
	wt->wcol = *(wt->wcol_theme);
}

/* special case, pie menu items */
static void widget_state_pie_menu_item(uiWidgetType *wt, int state, int UNUSED(drawflag))
{
	wt->wcol = *(wt->wcol_theme);

	/* active and disabled (not so common) */
	if ((state & UI_BUT_DISABLED) && (state & UI_ACTIVE)) {
		widget_state_blend(wt->wcol.text, wt->wcol.text_sel, 0.5f);
		/* draw the backdrop at low alpha, helps navigating with keys
		 * when disabled items are active */
		copy_v4_v4_char(wt->wcol.inner, wt->wcol.item);
		wt->wcol.inner[3] = 64;
	}
	else {
		/* regular active */
		if (state & (UI_SELECT | UI_ACTIVE)) {
			copy_v3_v3_char(wt->wcol.text, wt->wcol.text_sel);
		}
		else if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
			/* regular disabled */
			widget_state_blend(wt->wcol.text, wt->wcol.inner, 0.5f);
		}

		if (state & UI_SELECT) {
			copy_v4_v4_char(wt->wcol.inner, wt->wcol.inner_sel);
		}
		else if (state & UI_ACTIVE) {
			copy_v4_v4_char(wt->wcol.inner, wt->wcol.item);
		}
	}
}

/* special case, menu items */
static void widget_state_menu_item(uiWidgetType *wt, int state, int UNUSED(drawflag))
{
	wt->wcol = *(wt->wcol_theme);

	/* active and disabled (not so common) */
	if ((state & UI_BUT_DISABLED) && (state & UI_ACTIVE)) {
		widget_state_blend(wt->wcol.text, wt->wcol.text_sel, 0.5f);
		/* draw the backdrop at low alpha, helps navigating with keys
		 * when disabled items are active */
		copy_v4_v4_char(wt->wcol.inner, wt->wcol.inner_sel);
		wt->wcol.inner[3] = 64;
	}
	else {
		/* regular active */
		if (state & UI_ACTIVE) {
			copy_v3_v3_char(wt->wcol.text, wt->wcol.text_sel);
		}
		else if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
			/* regular disabled */
			widget_state_blend(wt->wcol.text, wt->wcol.inner, 0.5f);
		}

		if (state & UI_ACTIVE) {
			copy_v4_v4_char(wt->wcol.inner, wt->wcol.inner_sel);
		}
	}
}


/* ************ menu backdrop ************************* */

/* outside of rect, rad to left/bottom/right */
static void widget_softshadow(const rcti *rect, int roundboxalign, const float radin)
{
	bTheme *btheme = UI_GetTheme();
	uiWidgetBase wtb;
	rcti rect1 = *rect;
	float alphastep;
	int step, totvert;
	float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2];
	const float radout = UI_ThemeMenuShadowWidth();

	/* disabled shadow */
	if (radout == 0.0f)
		return;

	/* prevent tooltips to not show round shadow */
	if (radout > 0.2f * BLI_rcti_size_y(&rect1))
		rect1.ymax -= 0.2f * BLI_rcti_size_y(&rect1);
	else
		rect1.ymax -= radout;

	/* inner part */
	totvert = round_box_shadow_edges(wtb.inner_v, &rect1, radin, roundboxalign & (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT), 0.0f);

	/* we draw a number of increasing size alpha quad strips */
	alphastep = 3.0f * btheme->tui.menu_shadow_fac / radout;

	uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

	for (step = 1; step <= (int)radout; step++) {
		float expfac = sqrtf(step / radout);

		round_box_shadow_edges(wtb.outer_v, &rect1, radin, UI_CNR_ALL, (float)step);

		immUniformColor4f(0.0f, 0.0f, 0.0f, alphastep * (1.0f - expfac));

		widget_verts_to_triangle_strip(&wtb, totvert, triangle_strip);

		widget_draw_vertex_buffer(pos, 0, GL_TRIANGLE_STRIP, triangle_strip, NULL, totvert * 2);
	}

	immUnbindProgram();
}

static void widget_menu_back(uiWidgetColors *wcol, rcti *rect, int flag, int direction)
{
	uiWidgetBase wtb;
	int roundboxalign = UI_CNR_ALL;

	widget_init(&wtb);

	/* menu is 2nd level or deeper */
	if (flag & UI_BLOCK_POPUP) {
		//rect->ymin -= 4.0;
		//rect->ymax += 4.0;
	}
	else if (direction == UI_DIR_DOWN) {
		roundboxalign = (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
		rect->ymin -= 0.1f * U.widget_unit;
	}
	else if (direction == UI_DIR_UP) {
		roundboxalign = UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT;
		rect->ymax += 0.1f * U.widget_unit;
	}

	GPU_blend_set_func_separate(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
	GPU_blend(true);
	widget_softshadow(rect, roundboxalign, wcol->roundness * U.widget_unit);

	round_box_edges(&wtb, roundboxalign, rect, wcol->roundness * U.widget_unit);
	wtb.draw_emboss = false;
	widgetbase_draw(&wtb, wcol);

	GPU_blend(false);
}

static void ui_hsv_cursor(float x, float y)
{
	uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

	immUniformColor3f(1.0f, 1.0f, 1.0f);
	imm_draw_circle_fill_2d(pos, x, y, 3.0f * U.pixelsize, 8);

	GPU_blend(true);
	GPU_line_smooth(true);
	immUniformColor3f(0.0f, 0.0f, 0.0f);
	imm_draw_circle_wire_2d(pos, x, y, 3.0f * U.pixelsize, 12);
	GPU_blend(false);
	GPU_line_smooth(false);

	immUnbindProgram();
}

void ui_hsvcircle_vals_from_pos(
        float *val_rad, float *val_dist, const rcti *rect,
        const float mx, const float my)
{
	/* duplication of code... well, simple is better now */
	const float centx = BLI_rcti_cent_x_fl(rect);
	const float centy = BLI_rcti_cent_y_fl(rect);
	const float radius = (float)min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)) / 2.0f;
	const float m_delta[2] = {mx - centx, my - centy};
	const float dist_sq = len_squared_v2(m_delta);

	*val_dist = (dist_sq < (radius * radius)) ? sqrtf(dist_sq) / radius : 1.0f;
	*val_rad = atan2f(m_delta[0], m_delta[1]) / (2.0f * (float)M_PI) + 0.5f;
}

/* cursor in hsv circle, in float units -1 to 1, to map on radius */
void ui_hsvcircle_pos_from_vals(uiBut *but, const rcti *rect, float *hsv, float *xpos, float *ypos)
{
	/* duplication of code... well, simple is better now */
	const float centx = BLI_rcti_cent_x_fl(rect);
	const float centy = BLI_rcti_cent_y_fl(rect);
	float radius = (float)min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)) / 2.0f;
	float ang, radius_t;

	ang = 2.0f * (float)M_PI * hsv[0] + (float)M_PI_2;

	if ((but->flag & UI_BUT_COLOR_CUBIC) && (U.color_picker_type == USER_CP_CIRCLE_HSV))
		radius_t = (1.0f - pow3f(1.0f - hsv[1]));
	else
		radius_t = hsv[1];

	radius = clamp_f(radius_t, 0.0f, 1.0f) * radius;
	*xpos = centx + cosf(-ang) * radius;
	*ypos = centy + sinf(-ang) * radius;
}

static void ui_draw_but_HSVCIRCLE(uiBut *but, const uiWidgetColors *wcol, const rcti *rect)
{
	/* TODO(merwin): reimplement as shader for pixel-perfect colors */

	const int tot = 64;
	const float radstep = 2.0f * (float)M_PI / (float)tot;
	const float centx = BLI_rcti_cent_x_fl(rect);
	const float centy = BLI_rcti_cent_y_fl(rect);
	float radius = (float)min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)) / 2.0f;

	ColorPicker *cpicker = but->custom_data;
	float rgb[3], hsv[3], rgb_center[3];
	bool is_color_gamma = ui_but_is_color_gamma(but);

	/* Initialize for compatibility. */
	copy_v3_v3(hsv, cpicker->color_data);

	/* Compute current hue. */
	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);
	ui_rgb_to_color_picker_compat_v(rgb, hsv);

	CLAMP(hsv[2], 0.0f, 1.0f); /* for display only */

	/* exception: if 'lock' is set
	 * lock the value of the color wheel to 1.
	 * Useful for color correction tools where you're only interested in hue. */
	if (but->flag & UI_BUT_COLOR_LOCK) {
		if (U.color_picker_type == USER_CP_CIRCLE_HSV)
			hsv[2] = 1.0f;
		else
			hsv[2] = 0.5f;
	}

	const float hsv_center[3] = {0.0f, 0.0f, hsv[2]};
	ui_color_picker_to_rgb_v(hsv_center, rgb_center);
	ui_color_picker_to_scene_linear_space(but, rgb_center);

	if (!is_color_gamma) {
		ui_block_cm_to_display_space_v3(but->block, rgb_center);
	}

	GPUVertFormat *format = immVertexFormat();
	uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	uint color = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);

	immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);

	immBegin(GPU_PRIM_TRI_FAN, tot + 2);
	immAttr3fv(color, rgb_center);
	immVertex2f(pos, centx, centy);

	float ang = 0.0f;
	for (int a = 0; a <= tot; a++, ang += radstep) {
		float si = sinf(ang);
		float co = cosf(ang);
		float hsv_ang[3];
		float rgb_ang[3];

		ui_hsvcircle_vals_from_pos(hsv_ang, hsv_ang + 1, rect, centx + co * radius, centy + si * radius);
		hsv_ang[2] = hsv[2];

		ui_color_picker_to_rgb_v(hsv_ang, rgb_ang);
		ui_color_picker_to_scene_linear_space(but, rgb_ang);

		if (!is_color_gamma) {
			ui_block_cm_to_display_space_v3(but->block, rgb_ang);
		}

		immAttr3fv(color, rgb_ang);
		immVertex2f(pos, centx + co * radius, centy + si * radius);
	}
	immEnd();
	immUnbindProgram();

	/* fully rounded outline */
	format = immVertexFormat();
	pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

	GPU_blend(true);
	GPU_line_smooth(true);

	immUniformColor3ubv((uchar *)wcol->outline);
	imm_draw_circle_wire_2d(pos, centx, centy, radius, tot);

	immUnbindProgram();

	GPU_blend(false);
	GPU_line_smooth(false);

	/* cursor */
	copy_v3_v3(hsv, cpicker->color_data);
	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);
	ui_rgb_to_color_picker_compat_v(rgb, hsv);

	float xpos, ypos;
	ui_hsvcircle_pos_from_vals(but, rect, hsv, &xpos, &ypos);
	ui_hsv_cursor(xpos, ypos);
}

/* ************ custom buttons, old stuff ************** */

/* draws in resolution of 48x4 colors */
void ui_draw_gradient(const rcti *rect, const float hsv[3], const int type, const float alpha)
{
	/* allows for 4 steps (red->yellow) */
	const int steps = 48;
	const float color_step = 1.0f / steps;
	int a;
	float h = hsv[0], s = hsv[1], v = hsv[2];
	float dx, dy, sx1, sx2, sy;
	float col0[4][3];   /* left half, rect bottom to top */
	float col1[4][3];   /* right half, rect bottom to top */

	/* draw series of gouraud rects */

	switch (type) {
		case UI_GRAD_SV:
			hsv_to_rgb(h, 0.0, 0.0,   &col1[0][0], &col1[0][1], &col1[0][2]);
			hsv_to_rgb(h, 0.0, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
			hsv_to_rgb(h, 0.0, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
			hsv_to_rgb(h, 0.0, 1.0,   &col1[3][0], &col1[3][1], &col1[3][2]);
			break;
		case UI_GRAD_HV:
			hsv_to_rgb(0.0, s, 0.0,   &col1[0][0], &col1[0][1], &col1[0][2]);
			hsv_to_rgb(0.0, s, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
			hsv_to_rgb(0.0, s, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
			hsv_to_rgb(0.0, s, 1.0,   &col1[3][0], &col1[3][1], &col1[3][2]);
			break;
		case UI_GRAD_HS:
			hsv_to_rgb(0.0, 0.0, v,   &col1[0][0], &col1[0][1], &col1[0][2]);
			hsv_to_rgb(0.0, 0.333, v, &col1[1][0], &col1[1][1], &col1[1][2]);
			hsv_to_rgb(0.0, 0.666, v, &col1[2][0], &col1[2][1], &col1[2][2]);
			hsv_to_rgb(0.0, 1.0, v,   &col1[3][0], &col1[3][1], &col1[3][2]);
			break;
		case UI_GRAD_H:
			hsv_to_rgb(0.0, 1.0, 1.0, &col1[0][0], &col1[0][1], &col1[0][2]);
			copy_v3_v3(col1[1], col1[0]);
			copy_v3_v3(col1[2], col1[0]);
			copy_v3_v3(col1[3], col1[0]);
			break;
		case UI_GRAD_S:
			hsv_to_rgb(1.0, 0.0, 1.0, &col1[1][0], &col1[1][1], &col1[1][2]);
			copy_v3_v3(col1[0], col1[1]);
			copy_v3_v3(col1[2], col1[1]);
			copy_v3_v3(col1[3], col1[1]);
			break;
		case UI_GRAD_V:
			hsv_to_rgb(1.0, 1.0, 0.0, &col1[2][0], &col1[2][1], &col1[2][2]);
			copy_v3_v3(col1[0], col1[2]);
			copy_v3_v3(col1[1], col1[2]);
			copy_v3_v3(col1[3], col1[2]);
			break;
		default:
			assert(!"invalid 'type' argument");
			hsv_to_rgb(1.0, 1.0, 1.0, &col1[2][0], &col1[2][1], &col1[2][2]);
			copy_v3_v3(col1[0], col1[2]);
			copy_v3_v3(col1[1], col1[2]);
			copy_v3_v3(col1[3], col1[2]);
			break;
	}

	/* old below */
	GPUVertFormat *format = immVertexFormat();
	uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
	immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);

	immBegin(GPU_PRIM_TRIS, steps * 3 * 6);

	/* 0.999 = prevent float inaccuracy for steps */
	for (dx = 0.0f; dx < 0.999f; dx += color_step) {
		const float dx_next = dx + color_step;

		/* previous color */
		copy_v3_v3(col0[0], col1[0]);
		copy_v3_v3(col0[1], col1[1]);
		copy_v3_v3(col0[2], col1[2]);
		copy_v3_v3(col0[3], col1[3]);

		/* new color */
		switch (type) {
			case UI_GRAD_SV:
				hsv_to_rgb(h, dx, 0.0,   &col1[0][0], &col1[0][1], &col1[0][2]);
				hsv_to_rgb(h, dx, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
				hsv_to_rgb(h, dx, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
				hsv_to_rgb(h, dx, 1.0,   &col1[3][0], &col1[3][1], &col1[3][2]);
				break;
			case UI_GRAD_HV:
				hsv_to_rgb(dx_next, s, 0.0,   &col1[0][0], &col1[0][1], &col1[0][2]);
				hsv_to_rgb(dx_next, s, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
				hsv_to_rgb(dx_next, s, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
				hsv_to_rgb(dx_next, s, 1.0,   &col1[3][0], &col1[3][1], &col1[3][2]);
				break;
			case UI_GRAD_HS:
				hsv_to_rgb(dx_next, 0.0, v,   &col1[0][0], &col1[0][1], &col1[0][2]);
				hsv_to_rgb(dx_next, 0.333, v, &col1[1][0], &col1[1][1], &col1[1][2]);
				hsv_to_rgb(dx_next, 0.666, v, &col1[2][0], &col1[2][1], &col1[2][2]);
				hsv_to_rgb(dx_next, 1.0, v,   &col1[3][0], &col1[3][1], &col1[3][2]);
				break;
			case UI_GRAD_H:
				/* annoying but without this the color shifts - could be solved some other way
				 * - campbell */
				hsv_to_rgb(dx_next, 1.0, 1.0, &col1[0][0], &col1[0][1], &col1[0][2]);
				copy_v3_v3(col1[1], col1[0]);
				copy_v3_v3(col1[2], col1[0]);
				copy_v3_v3(col1[3], col1[0]);
				break;
			case UI_GRAD_S:
				hsv_to_rgb(h, dx, 1.0, &col1[1][0], &col1[1][1], &col1[1][2]);
				copy_v3_v3(col1[0], col1[1]);
				copy_v3_v3(col1[2], col1[1]);
				copy_v3_v3(col1[3], col1[1]);
				break;
			case UI_GRAD_V:
				hsv_to_rgb(h, 1.0, dx, &col1[2][0], &col1[2][1], &col1[2][2]);
				copy_v3_v3(col1[0], col1[2]);
				copy_v3_v3(col1[1], col1[2]);
				copy_v3_v3(col1[3], col1[2]);
				break;
		}

		/* rect */
		sx1 = rect->xmin + dx      * BLI_rcti_size_x(rect);
		sx2 = rect->xmin + dx_next * BLI_rcti_size_x(rect);
		sy = rect->ymin;
		dy = (float)BLI_rcti_size_y(rect) / 3.0f;

		for (a = 0; a < 3; a++, sy += dy) {
			immAttr4f(col, col0[a][0], col0[a][1], col0[a][2], alpha);
			immVertex2f(pos, sx1, sy);

			immAttr4f(col, col1[a][0], col1[a][1], col1[a][2], alpha);
			immVertex2f(pos, sx2, sy);

			immAttr4f(col, col1[a + 1][0], col1[a + 1][1], col1[a + 1][2], alpha);
			immVertex2f(pos, sx2, sy + dy);

			immAttr4f(col, col0[a][0], col0[a][1], col0[a][2], alpha);
			immVertex2f(pos, sx1, sy);

			immAttr4f(col, col1[a + 1][0], col1[a + 1][1], col1[a + 1][2], alpha);
			immVertex2f(pos, sx2, sy + dy);

			immAttr4f(col, col0[a + 1][0], col0[a + 1][1], col0[a + 1][2], alpha);
			immVertex2f(pos, sx1, sy + dy);
		}
	}
	immEnd();

	immUnbindProgram();
}

void ui_hsvcube_pos_from_vals(uiBut *but, const rcti *rect, float *hsv, float *xp, float *yp)
{
	float x = 0.0f, y = 0.0f;

	switch ((int)but->a1) {
		case UI_GRAD_SV:
			x = hsv[1]; y = hsv[2]; break;
		case UI_GRAD_HV:
			x = hsv[0]; y = hsv[2]; break;
		case UI_GRAD_HS:
			x = hsv[0]; y = hsv[1]; break;
		case UI_GRAD_H:
			x = hsv[0]; y = 0.5; break;
		case UI_GRAD_S:
			x = hsv[1]; y = 0.5; break;
		case UI_GRAD_V:
			x = hsv[2]; y = 0.5; break;
		case UI_GRAD_L_ALT:
			x = 0.5f;
			/* exception only for value strip - use the range set in but->min/max */
			y = hsv[2];
			break;
		case UI_GRAD_V_ALT:
			x = 0.5f;
			/* exception only for value strip - use the range set in but->min/max */
			y = (hsv[2] - but->softmin) / (but->softmax - but->softmin);
			break;
	}

	/* cursor */
	*xp = rect->xmin + x * BLI_rcti_size_x(rect);
	*yp = rect->ymin + y * BLI_rcti_size_y(rect);
}

static void ui_draw_but_HSVCUBE(uiBut *but, const rcti *rect)
{
	float rgb[3];
	float x = 0.0f, y = 0.0f;
	ColorPicker *cpicker = but->custom_data;
	float *hsv = cpicker->color_data;
	float hsv_n[3];

	/* Initialize for compatibility. */
	copy_v3_v3(hsv_n, hsv);

	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);
	rgb_to_hsv_compat_v(rgb, hsv_n);

	ui_draw_gradient(rect, hsv_n, but->a1, 1.0f);

	ui_hsvcube_pos_from_vals(but, rect, hsv_n, &x, &y);
	CLAMP(x, rect->xmin + 3.0f, rect->xmax - 3.0f);
	CLAMP(y, rect->ymin + 3.0f, rect->ymax - 3.0f);

	ui_hsv_cursor(x, y);

	/* outline */
	uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
	immUniformColor3ub(0, 0, 0);
	imm_draw_box_wire_2d(pos, (rect->xmin), (rect->ymin), (rect->xmax), (rect->ymax));
	immUnbindProgram();
}

/* vertical 'value' slider, using new widget code */
static void ui_draw_but_HSV_v(uiBut *but, const rcti *rect)
{
	bTheme *btheme = UI_GetTheme();
	uiWidgetColors *wcol = &btheme->tui.wcol_numslider;
	uiWidgetBase wtb;
	const float rad = wcol->roundness * BLI_rcti_size_x(rect);
	float x, y;
	float rgb[3], hsv[3], v;

	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);

	if (but->a1 == UI_GRAD_L_ALT)
		rgb_to_hsl_v(rgb, hsv);
	else
		rgb_to_hsv_v(rgb, hsv);
	v = hsv[2];

	/* map v from property range to [0,1] */
	if (but->a1 == UI_GRAD_V_ALT) {
		float min = but->softmin, max = but->softmax;
		v = (v - min) / (max - min);
	}

	widget_init(&wtb);

	/* fully rounded */
	round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

	/* setup temp colors */
	widgetbase_draw(
	        &wtb,
	        &((uiWidgetColors){
	            .outline = {0, 0, 0, 255},
	            .inner = {128, 128, 128, 255},
	            .shadetop = 127,
	            .shadedown = -128,
	            .shaded = 1,
	        })
	);

	/* We are drawing on top of widget bases. Flush cache. */
	GPU_blend(true);
	UI_widgetbase_draw_cache_flush();
	GPU_blend(false);

	/* cursor */
	x = rect->xmin + 0.5f * BLI_rcti_size_x(rect);
	y = rect->ymin + v    * BLI_rcti_size_y(rect);
	CLAMP(y, rect->ymin + 3.0f, rect->ymax - 3.0f);

	ui_hsv_cursor(x, y);
}

/* Generic round-box drawing. */
static void ui_draw_roundbox(const rcti *rect, const float rad, const uiWidgetColors *wcol)
{
	uiWidgetBase wtb;
	widget_init(&wtb);
	round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
	widgetbase_draw(&wtb, wcol);

	/* We are drawing on top of widget bases. Flush cache. */
	GPU_blend(true);
	UI_widgetbase_draw_cache_flush();
	GPU_blend(false);
}


/* ************ separator, for menus etc ***************** */
static void ui_draw_separator(const rcti *rect, const uiWidgetColors *wcol)
{
	int y = rect->ymin + BLI_rcti_size_y(rect) / 2 - 1;
	uchar col[4] = {
		wcol->text[0],
		wcol->text[1],
		wcol->text[2],
		30
	};

	uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

	GPU_blend(true);
	immUniformColor4ubv(col);
	GPU_line_width(1.0f);

	immBegin(GPU_PRIM_LINES, 2);
	immVertex2f(pos, rect->xmin, y);
	immVertex2f(pos, rect->xmax, y);
	immEnd();

	GPU_blend(false);

	immUnbindProgram();
}

/* ************ button callbacks, draw ***************** */
static void widget_numbut_draw(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign, bool emboss)
{
	uiWidgetBase wtb;
	const float rad = wcol->roundness * BLI_rcti_size_y(rect);
	const int handle_width = min_ii(BLI_rcti_size_x(rect) / 3, BLI_rcti_size_y(rect) * 0.7f);

	if (state & UI_SELECT)
		SWAP(short, wcol->shadetop, wcol->shadedown);

	widget_init(&wtb);

	if (!emboss) {
		round_box_edges(&wtb, roundboxalign, rect, rad);
	}
	else {
		wtb.draw_inner = false;
		wtb.draw_outline = false;
	}

	/* decoration */
	if ((state & UI_ACTIVE) && !(state & UI_STATE_TEXT_INPUT)) {
		uiWidgetColors wcol_zone;
		uiWidgetBase wtb_zone;
		rcti rect_zone;
		int roundboxalign_zone;

		/* left arrow zone */
		widget_init(&wtb_zone);
		wtb_zone.draw_outline = false;
		wtb_zone.draw_emboss = false;

		wcol_zone = *wcol;
		copy_v3_v3_char(wcol_zone.item, wcol->text);
		if (state & UI_STATE_ACTIVE_LEFT) {
			widget_active_color(wcol_zone.inner);
		}

		rect_zone = *rect;
		rect_zone.xmax = rect->xmin + handle_width + U.pixelsize;
		roundboxalign_zone = roundboxalign & ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
		round_box_edges(&wtb_zone, roundboxalign_zone, &rect_zone, rad);

		shape_preset_init_number_arrows(&wtb_zone.tria1, &rect_zone, 0.6f, 'l');
		widgetbase_draw(&wtb_zone, &wcol_zone);

		/* right arrow zone */
		widget_init(&wtb_zone);
		wtb_zone.draw_outline = false;
		wtb_zone.draw_emboss = false;
		wtb_zone.tria1.type = ROUNDBOX_TRIA_ARROWS;

		wcol_zone = *wcol;
		copy_v3_v3_char(wcol_zone.item, wcol->text);
		if (state & UI_STATE_ACTIVE_RIGHT) {
			widget_active_color(wcol_zone.inner);
		}

		rect_zone = *rect;
		rect_zone.xmin = rect->xmax - handle_width - U.pixelsize;
		roundboxalign_zone = roundboxalign & ~(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
		round_box_edges(&wtb_zone, roundboxalign_zone, &rect_zone, rad);

		shape_preset_init_number_arrows(&wtb_zone.tria2, &rect_zone, 0.6f, 'r');
		widgetbase_draw(&wtb_zone, &wcol_zone);

		/* middle highlight zone */
		widget_init(&wtb_zone);
		wtb_zone.draw_outline = false;
		wtb_zone.draw_emboss = false;

		wcol_zone = *wcol;
		copy_v3_v3_char(wcol_zone.item, wcol->text);
		if (!(state & (UI_STATE_ACTIVE_LEFT | UI_STATE_ACTIVE_RIGHT))) {
			widget_active_color(wcol_zone.inner);
		}

		rect_zone = *rect;
		rect_zone.xmin = rect->xmin + handle_width - U.pixelsize;
		rect_zone.xmax = rect->xmax - handle_width + U.pixelsize;
		round_box_edges(&wtb_zone, 0, &rect_zone, 0);
		widgetbase_draw(&wtb_zone, &wcol_zone);

		/* outline */
		wtb.draw_inner = false;
		widgetbase_draw(&wtb, wcol);
	}
	else {
		/* inner and outline */
		widgetbase_draw(&wtb, wcol);
	}

	if (!(state & UI_STATE_TEXT_INPUT)) {
		const float textofs = 0.425f * BLI_rcti_size_y(rect);

		/* text space */
		rect->xmin += textofs;
		rect->xmax -= textofs;
	}
}

static void widget_numbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	widget_numbut_draw(wcol, rect, state, roundboxalign, false);
}

/**
 * Draw number buttons still with triangles when field is not embossed
 */
static void widget_numbut_embossn(uiBut *UNUSED(but), uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	widget_numbut_draw(wcol, rect, state, roundboxalign, true);
}

/* function in use for buttons and for view2d sliders */
void UI_draw_widget_scroll(uiWidgetColors *wcol, const rcti *rect, const rcti *slider, int state)
{
	uiWidgetBase wtb;
	int horizontal;
	float rad;
	bool outline = false;

	widget_init(&wtb);

	/* determine horizontal/vertical */
	horizontal = (BLI_rcti_size_x(rect) > BLI_rcti_size_y(rect));

	if (horizontal)
		rad = wcol->roundness * BLI_rcti_size_y(rect);
	else
		rad = wcol->roundness * BLI_rcti_size_x(rect);

	wtb.uniform_params.shade_dir = (horizontal) ? 1.0f : 0.0;

	/* draw back part, colors swapped and shading inverted */
	if (horizontal)
		SWAP(short, wcol->shadetop, wcol->shadedown);

	round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
	widgetbase_draw(&wtb, wcol);

	/* slider */
	if ((BLI_rcti_size_x(slider) < 2) || (BLI_rcti_size_y(slider) < 2)) {
		/* pass */
	}
	else {
		SWAP(short, wcol->shadetop, wcol->shadedown);

		copy_v4_v4_char(wcol->inner, wcol->item);

		if (wcol->shadetop > wcol->shadedown)
			wcol->shadetop += 20;   /* XXX violates themes... */
		else wcol->shadedown += 20;

		if (state & UI_SCROLL_PRESSED) {
			wcol->inner[0] = wcol->inner[0] >= 250 ? 255 : wcol->inner[0] + 5;
			wcol->inner[1] = wcol->inner[1] >= 250 ? 255 : wcol->inner[1] + 5;
			wcol->inner[2] = wcol->inner[2] >= 250 ? 255 : wcol->inner[2] + 5;
		}

		/* draw */
		wtb.draw_emboss = false; /* only emboss once */

		/* exception for progress bar */
		if (state & UI_SCROLL_NO_OUTLINE) {
			SWAP(bool, outline, wtb.draw_outline);
		}

		round_box_edges(&wtb, UI_CNR_ALL, slider, rad);

		if (state & UI_SCROLL_ARROWS) {
			if (wcol->item[0] > 48) wcol->item[0] -= 48;
			if (wcol->item[1] > 48) wcol->item[1] -= 48;
			if (wcol->item[2] > 48) wcol->item[2] -= 48;
			wcol->item[3] = 255;

			if (horizontal) {
				shape_preset_init_scroll_circle(&wtb.tria1, slider, 0.6f, 'l');
				shape_preset_init_scroll_circle(&wtb.tria2, slider, 0.6f, 'r');
			}
			else {
				shape_preset_init_scroll_circle(&wtb.tria1, slider, 0.6f, 'b');
				shape_preset_init_scroll_circle(&wtb.tria2, slider, 0.6f, 't');
			}
		}
		widgetbase_draw(&wtb, wcol);

		if (state & UI_SCROLL_NO_OUTLINE) {
			SWAP(bool, outline, wtb.draw_outline);
		}
	}
}

static void widget_scroll(uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int UNUSED(roundboxalign))
{
	rcti rect1;
	double value;
	float fac, size, min;
	int horizontal;

	/* calculate slider part */
	value = ui_but_value_get(but);

	size = (but->softmax + but->a1 - but->softmin);
	size = max_ff(size, 2.0f);

	/* position */
	rect1 = *rect;

	/* determine horizontal/vertical */
	horizontal = (BLI_rcti_size_x(rect) > BLI_rcti_size_y(rect));

	if (horizontal) {
		fac = BLI_rcti_size_x(rect) / size;
		rect1.xmin = rect1.xmin + ceilf(fac * ((float)value - but->softmin));
		rect1.xmax = rect1.xmin + ceilf(fac * (but->a1 - but->softmin));

		/* ensure minimium size */
		min = BLI_rcti_size_y(rect);

		if (BLI_rcti_size_x(&rect1) < min) {
			rect1.xmax = rect1.xmin + min;

			if (rect1.xmax > rect->xmax) {
				rect1.xmax = rect->xmax;
				rect1.xmin = max_ii(rect1.xmax - min, rect->xmin);
			}
		}
	}
	else {
		fac = BLI_rcti_size_y(rect) / size;
		rect1.ymax = rect1.ymax - ceilf(fac * ((float)value - but->softmin));
		rect1.ymin = rect1.ymax - ceilf(fac * (but->a1 - but->softmin));

		/* ensure minimium size */
		min = BLI_rcti_size_x(rect);

		if (BLI_rcti_size_y(&rect1) < min) {
			rect1.ymax = rect1.ymin + min;

			if (rect1.ymax > rect->ymax) {
				rect1.ymax = rect->ymax;
				rect1.ymin = max_ii(rect1.ymax - min, rect->ymin);
			}
		}
	}

	if (state & UI_SELECT)
		state = UI_SCROLL_PRESSED;
	else
		state = 0;
	UI_draw_widget_scroll(wcol, rect, &rect1, state);
}

static void widget_progressbar(uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb, wtb_bar;
	rcti rect_prog = *rect, rect_bar = *rect;

	widget_init(&wtb);
	widget_init(&wtb_bar);

	/* round corners */
	float value = but->a1;
	float offs = wcol->roundness * BLI_rcti_size_y(&rect_prog);
	float w = value * BLI_rcti_size_x(&rect_prog);

	/* ensure minimium size */
	w = MAX2(w, offs);

	rect_bar.xmax = rect_bar.xmin + w;

	round_box_edges(&wtb, roundboxalign, &rect_prog, offs);
	round_box_edges(&wtb_bar, roundboxalign, &rect_bar, offs);

	wtb.draw_outline = true;
	widgetbase_draw(&wtb, wcol);

	/* "slider" bar color */
	copy_v3_v3_char(wcol->inner, wcol->item);
	widgetbase_draw(&wtb_bar, wcol);

	/* raise text a bit */
	rect->xmin += (BLI_rcti_size_x(&rect_prog) / 2);
	rect->xmax += (BLI_rcti_size_x(&rect_prog) / 2);
}

static void widget_numslider(uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	uiWidgetBase wtb, wtb1;
	rcti rect1;
	float offs, toffs;
	char outline[3];

	widget_init(&wtb);
	widget_init(&wtb1);

	/* Backdrop first. */
	offs = wcol->roundness * BLI_rcti_size_y(rect);
	toffs = offs * 0.75f;
	round_box_edges(&wtb, roundboxalign, rect, offs);

	wtb.draw_outline = false;
	widgetbase_draw(&wtb, wcol);

	/* Draw slider part only when not in text editing. */
	if (!(state & UI_STATE_TEXT_INPUT)) {
		int roundboxalign_slider = roundboxalign;

		copy_v3_v3_char(outline, wcol->outline);
		copy_v3_v3_char(wcol->outline, wcol->item);
		copy_v3_v3_char(wcol->inner, wcol->item);

		if (!(state & UI_SELECT)) {
			SWAP(short, wcol->shadetop, wcol->shadedown);
		}

		rect1 = *rect;
		float factor, factor_ui;
		float factor_discard = 1.0f; /* No discard. */
		float value = (float)ui_but_value_get(but);

		if (but->rnaprop && (RNA_property_subtype(but->rnaprop) == PROP_PERCENTAGE)) {
			factor = value / but->softmax;
		}
		else {
			factor = (value - but->softmin) / (but->softmax - but->softmin);
		}

		float width = (float)BLI_rcti_size_x(rect);
		factor_ui = factor * width;

		if (factor_ui <= offs) {
			/* Left part only. */
			roundboxalign_slider &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
			rect1.xmax = rect1.xmin + offs;
			factor_discard = factor_ui / offs;
		}
		else if (factor_ui <= width - offs) {
			/* Left part + middle part. */
			roundboxalign_slider &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
			rect1.xmax = rect1.xmin + factor_ui;
		}
		else {
			/* Left part + middle part + right part. */
			factor_discard = factor;
		}

		round_box_edges(&wtb1, roundboxalign_slider, &rect1, offs);
		wtb1.draw_outline = false;
		widgetbase_set_uniform_discard_factor(&wtb1, factor_discard);
		widgetbase_draw(&wtb1, wcol);

		copy_v3_v3_char(wcol->outline, outline);

		if (!(state & UI_SELECT)) {
			SWAP(short, wcol->shadetop, wcol->shadedown);
		}
	}

	/* Outline. */
	wtb.draw_outline = true;
	wtb.draw_inner = false;
	widgetbase_draw(&wtb, wcol);

	/* Add space at either side of the button so text aligns with numbuttons
	 * (which have arrow icons). */
	if (!(state & UI_STATE_TEXT_INPUT)) {
		rect->xmax -= toffs;
		rect->xmin += toffs;
	}
}

/* I think 3 is sufficient border to indicate keyed status */
#define SWATCH_KEYED_BORDER 3

static void widget_swatch(uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	uiWidgetBase wtb;
	float rad, col[4];

	col[3] = 1.0f;

	if (but->rnaprop) {
		BLI_assert(but->rnaindex == -1);

		if (RNA_property_array_length(&but->rnapoin, but->rnaprop) == 4) {
			col[3] = RNA_property_float_get_index(&but->rnapoin, but->rnaprop, 3);
		}
	}

	widget_init(&wtb);

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	ui_but_v3_get(but, col);

	if ((state & (UI_BUT_ANIMATED | UI_BUT_ANIMATED_KEY | UI_BUT_DRIVEN | UI_BUT_OVERRIDEN | UI_BUT_REDALERT)) ||
	    (but->drawflag & UI_BUT_ANIMATED_CHANGED))
	{
		/* draw based on state - color for keyed etc */
		widgetbase_draw(&wtb, wcol);

		/* inset to draw swatch color */
		rect->xmin += SWATCH_KEYED_BORDER;
		rect->xmax -= SWATCH_KEYED_BORDER;
		rect->ymin += SWATCH_KEYED_BORDER;
		rect->ymax -= SWATCH_KEYED_BORDER;

		round_box_edges(&wtb, roundboxalign, rect, rad);
	}

	if (!ui_but_is_color_gamma(but))
		ui_block_cm_to_display_space_v3(but->block, col);

	rgba_float_to_uchar((uchar *)wcol->inner, col);
	const bool show_alpha_checkers = (wcol->inner[3] < 255);

	wcol->shaded = 0;

	if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
		/* Now we reduce alpha of the inner color (i.e. the color shown)
		 * so that this setting can look grayed out, while retaining
		 * the checkboard (for transparent values). This is needed
		 * here as the effects of ui_widget_color_disabled() are overwritten.
		 */
		wcol->inner[3] /= 2;
	}

	widgetbase_draw_ex(&wtb, wcol, show_alpha_checkers);
	if (but->a1 == UI_PALETTE_COLOR && ((Palette *)but->rnapoin.id.data)->active_color == (int)but->a2) {
		float width = rect->xmax - rect->xmin;
		float height = rect->ymax - rect->ymin;
		/* find color luminance and change it slightly */
		float bw = rgb_to_grayscale(col);

		bw += (bw < 0.5f) ? 0.5f : -0.5f;

		/* We are drawing on top of widget bases. Flush cache. */
		GPU_blend(true);
		UI_widgetbase_draw_cache_flush();
		GPU_blend(false);

		uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
		immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

		immUniformColor3f(bw, bw, bw);
		immBegin(GPU_PRIM_TRIS, 3);
		immVertex2f(pos, rect->xmin + 0.1f * width, rect->ymin + 0.9f * height);
		immVertex2f(pos, rect->xmin + 0.1f * width, rect->ymin + 0.5f * height);
		immVertex2f(pos, rect->xmin + 0.5f * width, rect->ymin + 0.9f * height);
		immEnd();

		immUnbindProgram();
	}
}

static void widget_unitvec(uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
	ui_draw_but_UNITVEC(but, wcol, rect);
}

static void widget_icon_has_anim(uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	if (state & (UI_BUT_ANIMATED | UI_BUT_ANIMATED_KEY | UI_BUT_DRIVEN | UI_BUT_REDALERT)) {
		uiWidgetBase wtb;
		float rad;

		widget_init(&wtb);
		wtb.draw_outline = false;

		rad = wcol->roundness * BLI_rcti_size_y(rect);
		round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
		widgetbase_draw(&wtb, wcol);
	}
	else if (but->type == UI_BTYPE_NUM) {
		/* Draw number buttons still with left/right
		 * triangles when field is not embossed */
		widget_numbut_embossn(but, wcol, rect, state, roundboxalign);
	}
}


static void widget_textbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	uiWidgetBase wtb;
	float rad;

	if (state & UI_SELECT)
		SWAP(short, wcol->shadetop, wcol->shadedown);

	widget_init(&wtb);

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	widgetbase_draw(&wtb, wcol);
}


static void widget_menubut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb;
	float rad;

	widget_init(&wtb);

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	/* decoration */
	shape_preset_trias_from_rect_menu(&wtb.tria1, rect);
	/* copy size and center to 2nd tria */
	wtb.tria2 = wtb.tria1;

	widgetbase_draw(&wtb, wcol);

	/* text space, arrows are about 0.6 height of button */
	rect->xmax -= (6 * BLI_rcti_size_y(rect)) / 10;
}

static void widget_menuiconbut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb;
	float rad;

	widget_init(&wtb);

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	/* decoration */
	widgetbase_draw(&wtb, wcol);
}

static void widget_pulldownbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	float back[4];
	UI_GetThemeColor4fv(TH_BACK, back);

	if ((state & UI_ACTIVE) || (back[3] < 1.0f)) {
		uiWidgetBase wtb;
		const float rad = wcol->roundness * U.widget_unit;

		if (state & UI_ACTIVE) {
			copy_v4_v4_char(wcol->inner, wcol->inner_sel);
			copy_v3_v3_char(wcol->text, wcol->text_sel);
			copy_v3_v3_char(wcol->outline, wcol->inner);
		}
		else {
			wcol->inner[3] *= 1.0f - back[3];
			wcol->outline[3] = 0.0f;
		}

		widget_init(&wtb);

		/* half rounded */
		round_box_edges(&wtb, roundboxalign, rect, rad);

		widgetbase_draw(&wtb, wcol);
	}
}

static void widget_menu_itembut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
	uiWidgetBase wtb;

	widget_init(&wtb);

	/* not rounded, no outline */
	wtb.draw_outline = false;
	round_box_edges(&wtb, 0, rect, 0.0f);

	widgetbase_draw(&wtb, wcol);
}

static void widget_menu_radial_itembut(uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
	uiWidgetBase wtb;
	float rad;
	float fac = but->block->pie_data.alphafac;

	widget_init(&wtb);

	wtb.draw_emboss = false;

	rad = wcol->roundness * BLI_rcti_size_y(rect);
	round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

	wcol->inner[3] *= fac;
	wcol->inner_sel[3] *= fac;
	wcol->item[3] *= fac;
	wcol->text[3] *= fac;
	wcol->text_sel[3] *= fac;
	wcol->outline[3] *= fac;

	widgetbase_draw(&wtb, wcol);
}

static void widget_list_itembut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
	uiWidgetBase wtb;
	float rad;

	widget_init(&wtb);

	/* no outline */
	wtb.draw_outline = false;
	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

	widgetbase_draw(&wtb, wcol);
}

static void widget_optionbut(uiWidgetColors *wcol, rcti *rect, int state, int UNUSED(roundboxalign))
{
	uiWidgetBase wtb;
	rcti recttemp = *rect;
	float rad;
	int delta;

	widget_init(&wtb);

	/* square */
	recttemp.xmax = recttemp.xmin + BLI_rcti_size_y(&recttemp);

	/* smaller */
	delta = 1 + BLI_rcti_size_y(&recttemp) / 8;
	recttemp.xmin += delta;
	recttemp.ymin += delta;
	recttemp.xmax -= delta;
	recttemp.ymax -= delta;

	rad = wcol->roundness * BLI_rcti_size_y(&recttemp);
	round_box_edges(&wtb, UI_CNR_ALL, &recttemp, rad);

	/* decoration */
	if (state & UI_SELECT) {
		shape_preset_trias_from_rect_checkmark(&wtb.tria1, &recttemp);
	}

	widgetbase_draw(&wtb, wcol);

	/* text space */
	rect->xmin += BLI_rcti_size_y(rect) * 0.7 + delta;
}

/* labels use Editor theme colors for text */
static void widget_state_label(uiWidgetType *wt, int state, int drawflag)
{
	if (state & UI_BUT_LIST_ITEM) {
		/* Override default label theme's colors. */
		bTheme *btheme = UI_GetTheme();
		wt->wcol_theme = &btheme->tui.wcol_list_item;
		/* call this for option button */
		widget_state(wt, state, drawflag);
	}
	else {
		/* call this for option button */
		widget_state(wt, state, drawflag);
		if (state & UI_SELECT)
			UI_GetThemeColor3ubv(TH_TEXT_HI, (uchar *)wt->wcol.text);
		else
			UI_GetThemeColor3ubv(TH_TEXT, (uchar *)wt->wcol.text);
	}

	if (state & UI_BUT_REDALERT) {
		char red[4] = {255, 0, 0};
		widget_state_blend(wt->wcol.text, red, 0.4f);
	}
}

static void widget_radiobut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb;
	float rad;

	widget_init(&wtb);

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	widgetbase_draw(&wtb, wcol);
}

static void widget_box(uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb;
	float rad;
	char old_col[3];

	widget_init(&wtb);

	copy_v3_v3_char(old_col, wcol->inner);

	/* abuse but->hsv - if it's non-zero, use this color as the box's background */
	if (but->col[3]) {
		wcol->inner[0] = but->col[0];
		wcol->inner[1] = but->col[1];
		wcol->inner[2] = but->col[2];
		wcol->inner[3] = but->col[3];
	}

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	widgetbase_draw(&wtb, wcol);

	copy_v3_v3_char(wcol->inner, old_col);
}

static void widget_but(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb;
	float rad;

	widget_init(&wtb);

	rad = wcol->roundness * U.widget_unit;
	round_box_edges(&wtb, roundboxalign, rect, rad);

	widgetbase_draw(&wtb, wcol);
}

#if 0
static void widget_roundbut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
	uiWidgetBase wtb;
	const float rad = wcol->roundness * U.widget_unit;

	widget_init(&wtb);

	/* half rounded */
	round_box_edges(&wtb, roundboxalign, rect, rad);

	widgetbase_draw(&wtb, wcol);
}
#endif

static void widget_roundbut_exec(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	uiWidgetBase wtb;
	const float rad = wcol->roundness * U.widget_unit;

	widget_init(&wtb);

	if (state & UI_STATE_HOLD_ACTION) {
		/* Show that keeping pressed performs another action (typically a menu). */
		shape_preset_init_hold_action(&wtb.tria1, rect, 0.75f, 'r');
	}

	/* half rounded */
	round_box_edges(&wtb, roundboxalign, rect, rad);

	widgetbase_draw(&wtb, wcol);
}

static void widget_tab(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
	const float rad = wcol->roundness * U.widget_unit;
	const bool is_active = (state & UI_SELECT);

/* Draw shaded outline - Disabled for now,
 * seems incorrect and also looks nicer without it imho ;) */
//#define USE_TAB_SHADED_HIGHLIGHT

	uiWidgetBase wtb;
	uchar theme_col_tab_highlight[3];

#ifdef USE_TAB_SHADED_HIGHLIGHT
	/* create outline highlight colors */
	if (is_active) {
		interp_v3_v3v3_uchar(theme_col_tab_highlight, (uchar *)wcol->inner_sel,
		                     (uchar *)wcol->outline, 0.2f);
	}
	else {
		interp_v3_v3v3_uchar(theme_col_tab_highlight, (uchar *)wcol->inner,
		                     (uchar *)wcol->outline, 0.12f);
	}
#endif

	widget_init(&wtb);

	/* half rounded */
	round_box_edges(&wtb, roundboxalign, rect, rad);

	/* draw inner */
#ifdef USE_TAB_SHADED_HIGHLIGHT
	wtb.draw_outline = 0;
#endif
	widgetbase_draw(&wtb, wcol);

	/* We are drawing on top of widget bases. Flush cache. */
	GPU_blend(true);
	UI_widgetbase_draw_cache_flush();
	GPU_blend(false);

#ifdef USE_TAB_SHADED_HIGHLIGHT
	/* draw outline (3d look) */
	ui_draw_but_TAB_outline(rect, rad, theme_col_tab_highlight, (uchar *)wcol->inner);
#endif

#ifndef USE_TAB_SHADED_HIGHLIGHT
	UNUSED_VARS(is_active, theme_col_tab_highlight);
#endif
}

static void widget_draw_extra_mask(const bContext *C, uiBut *but, uiWidgetType *wt, rcti *rect)
{
	bTheme *btheme = UI_GetTheme();
	uiWidgetColors *wcol = &btheme->tui.wcol_radio;
	uiWidgetBase wtb;
	const float rad = wcol->roundness * U.widget_unit;
	uchar col[4];

	/* state copy! */
	wt->wcol = *(wt->wcol_theme);

	widget_init(&wtb);

	if (but->block->drawextra) {
		/* note: drawextra can change rect +1 or -1, to match round errors of existing previews */
		but->block->drawextra(C, but->poin, but->block->drawextra_arg1, but->block->drawextra_arg2, rect);

		uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
		immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

		/* make mask to draw over image */
		UI_GetThemeColor3ubv(TH_BACK, col);
		immUniformColor3ubv(col);

		round_box__edges(&wtb, UI_CNR_ALL, rect, 0.0f, rad);
		widgetbase_outline(&wtb, pos);

		immUnbindProgram();
	}

	/* outline */
	round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
	wtb.draw_outline = true;
	wtb.draw_inner = false;
	widgetbase_draw(&wtb, &wt->wcol);
}

static uiWidgetType *widget_type(uiWidgetTypeEnum type)
{
	bTheme *btheme = UI_GetTheme();
	static uiWidgetType wt;

	/* defaults */
	wt.wcol_theme = &btheme->tui.wcol_regular;
	wt.wcol_state = &btheme->tui.wcol_state;
	wt.state = widget_state;
	wt.draw = widget_but;
	wt.custom = NULL;
	wt.text = widget_draw_text_icon;

	switch (type) {
		case UI_WTYPE_REGULAR:
			break;

		case UI_WTYPE_LABEL:
			wt.draw = NULL;
			wt.state = widget_state_label;
			break;

		case UI_WTYPE_TOGGLE:
			wt.wcol_theme = &btheme->tui.wcol_toggle;
			break;

		case UI_WTYPE_CHECKBOX:
			wt.wcol_theme = &btheme->tui.wcol_option;
			wt.draw = widget_optionbut;
			break;

		case UI_WTYPE_RADIO:
			wt.wcol_theme = &btheme->tui.wcol_radio;
			wt.draw = widget_radiobut;
			break;

		case UI_WTYPE_NUMBER:
			wt.wcol_theme = &btheme->tui.wcol_num;
			wt.draw = widget_numbut;
			break;

		case UI_WTYPE_SLIDER:
			wt.wcol_theme = &btheme->tui.wcol_numslider;
			wt.custom = widget_numslider;
			wt.state = widget_state_numslider;
			break;

		case UI_WTYPE_EXEC:
			wt.wcol_theme = &btheme->tui.wcol_tool;
			wt.draw = widget_roundbut_exec;
			break;

		case UI_WTYPE_TOOLBAR_ITEM:
			wt.wcol_theme = &btheme->tui.wcol_toolbar_item;
			wt.draw = widget_roundbut_exec;
			break;

		case UI_WTYPE_TAB:
			wt.wcol_theme = &btheme->tui.wcol_tab;
			wt.draw = widget_tab;
			break;

		case UI_WTYPE_TOOLTIP:
			wt.wcol_theme = &btheme->tui.wcol_tooltip;
			wt.draw = widget_menu_back;
			break;


		/* strings */
		case UI_WTYPE_NAME:
			wt.wcol_theme = &btheme->tui.wcol_text;
			wt.draw = widget_textbut;
			break;

		case UI_WTYPE_NAME_LINK:
			break;

		case UI_WTYPE_POINTER_LINK:
			break;

		case UI_WTYPE_FILENAME:
			break;


		/* start menus */
		case UI_WTYPE_MENU_RADIO:
			wt.wcol_theme = &btheme->tui.wcol_menu;
			wt.draw = widget_menubut;
			break;

		case UI_WTYPE_MENU_ICON_RADIO:
		case UI_WTYPE_MENU_NODE_LINK:
			wt.wcol_theme = &btheme->tui.wcol_menu;
			wt.draw = widget_menuiconbut;
			break;

		case UI_WTYPE_MENU_POINTER_LINK:
			wt.wcol_theme = &btheme->tui.wcol_menu;
			wt.draw = widget_menubut;
			break;

		case UI_WTYPE_PULLDOWN:
			wt.wcol_theme = &btheme->tui.wcol_pulldown;
			wt.draw = widget_pulldownbut;
			wt.state = widget_state_pulldown;
			break;

		/* in menus */
		case UI_WTYPE_MENU_ITEM:
			wt.wcol_theme = &btheme->tui.wcol_menu_item;
			wt.draw = widget_menu_itembut;
			wt.state = widget_state_menu_item;
			break;

		case UI_WTYPE_MENU_BACK:
			wt.wcol_theme = &btheme->tui.wcol_menu_back;
			wt.draw = widget_menu_back;
			break;

		/* specials */
		case UI_WTYPE_ICON:
			wt.custom = widget_icon_has_anim;
			break;

		case UI_WTYPE_ICON_LABEL:
			/* behave like regular labels (this is simply a label with an icon) */
			wt.state = widget_state_label;
			wt.custom = widget_icon_has_anim;
			break;

		case UI_WTYPE_SWATCH:
			wt.custom = widget_swatch;
			break;

		case UI_WTYPE_BOX:
			wt.custom = widget_box;
			wt.wcol_theme = &btheme->tui.wcol_box;
			break;

		case UI_WTYPE_RGB_PICKER:
			break;

		case UI_WTYPE_UNITVEC:
			wt.custom = widget_unitvec;
			break;

		case UI_WTYPE_SCROLL:
			wt.wcol_theme = &btheme->tui.wcol_scroll;
			wt.state = widget_state_nothing;
			wt.custom = widget_scroll;
			break;

		case UI_WTYPE_LISTITEM:
			wt.wcol_theme = &btheme->tui.wcol_list_item;
			wt.draw = widget_list_itembut;
			break;

		case UI_WTYPE_PROGRESSBAR:
			wt.wcol_theme = &btheme->tui.wcol_progress;
			wt.custom = widget_progressbar;
			break;

		case UI_WTYPE_MENU_ITEM_RADIAL:
			wt.wcol_theme = &btheme->tui.wcol_pie_menu;
			wt.custom = widget_menu_radial_itembut;
			wt.state = widget_state_pie_menu_item;
			break;
	}

	return &wt;
}


static int widget_roundbox_set(uiBut *but, rcti *rect)
{
	int roundbox = UI_CNR_ALL;

	/* alignment */
	if ((but->drawflag & UI_BUT_ALIGN) && but->type != UI_BTYPE_PULLDOWN) {

		/* ui_popup_block_position has this correction too, keep in sync */
		if (but->drawflag & (UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_STITCH_TOP))
			rect->ymax += U.pixelsize;
		if (but->drawflag & (UI_BUT_ALIGN_LEFT | UI_BUT_ALIGN_STITCH_LEFT))
			rect->xmin -= U.pixelsize;

		switch (but->drawflag & UI_BUT_ALIGN) {
			case UI_BUT_ALIGN_TOP:
				roundbox = UI_CNR_BOTTOM_LEFT | UI_CNR_BOTTOM_RIGHT;
				break;
			case UI_BUT_ALIGN_DOWN:
				roundbox = UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT;
				break;
			case UI_BUT_ALIGN_LEFT:
				roundbox = UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT;
				break;
			case UI_BUT_ALIGN_RIGHT:
				roundbox = UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT;
				break;
			case UI_BUT_ALIGN_DOWN | UI_BUT_ALIGN_RIGHT:
				roundbox = UI_CNR_TOP_LEFT;
				break;
			case UI_BUT_ALIGN_DOWN | UI_BUT_ALIGN_LEFT:
				roundbox = UI_CNR_TOP_RIGHT;
				break;
			case UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_RIGHT:
				roundbox = UI_CNR_BOTTOM_LEFT;
				break;
			case UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_LEFT:
				roundbox = UI_CNR_BOTTOM_RIGHT;
				break;
			default:
				roundbox = 0;
				break;
		}
	}

	/* align with open menu */
	if (but->active && (but->type != UI_BTYPE_POPOVER)) {
		int direction = ui_but_menu_direction(but);

		if      (direction == UI_DIR_UP)    roundbox &= ~(UI_CNR_TOP_RIGHT    | UI_CNR_TOP_LEFT);
		else if (direction == UI_DIR_DOWN)  roundbox &= ~(UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
		else if (direction == UI_DIR_LEFT)  roundbox &= ~(UI_CNR_TOP_LEFT     | UI_CNR_BOTTOM_LEFT);
		else if (direction == UI_DIR_RIGHT) roundbox &= ~(UI_CNR_TOP_RIGHT    | UI_CNR_BOTTOM_RIGHT);
	}

	return roundbox;
}

/* -------------------------------------------------------------------- */
/** \name Public API
 * \{ */

/* conversion from old to new buttons, so still messy */
void ui_draw_but(const bContext *C, ARegion *ar, uiStyle *style, uiBut *but, rcti *rect)
{
	bTheme *btheme = UI_GetTheme();
	const ThemeUI *tui = &btheme->tui;
	const uiFontStyle *fstyle = &style->widget;
	uiWidgetType *wt = NULL;

#ifdef USE_UI_POPOVER_ONCE
	const rcti rect_orig = *rect;
#endif

	/* handle menus separately */
	if (but->dt == UI_EMBOSS_PULLDOWN) {
		switch (but->type) {
			case UI_BTYPE_LABEL:
				widget_draw_text_icon(&style->widgetlabel, &tui->wcol_menu_back, but, rect);
				break;
			case UI_BTYPE_SEPR_LINE:
				ui_draw_separator(rect, &tui->wcol_menu_item);
				break;
			default:
				wt = widget_type(UI_WTYPE_MENU_ITEM);
				break;
		}
	}
	else if (but->dt == UI_EMBOSS_NONE) {
		/* "nothing" */
		switch (but->type) {
			case UI_BTYPE_LABEL:
				wt = widget_type(UI_WTYPE_ICON_LABEL);
				break;
			default:
				wt = widget_type(UI_WTYPE_ICON);
				break;
		}
	}
	else if (but->dt == UI_EMBOSS_RADIAL) {
		wt = widget_type(UI_WTYPE_MENU_ITEM_RADIAL);
	}
	else {
		BLI_assert(but->dt == UI_EMBOSS);

		switch (but->type) {
			case UI_BTYPE_LABEL:
				wt = widget_type(UI_WTYPE_LABEL);
				fstyle = &style->widgetlabel;
				if (but->drawflag & UI_BUT_BOX_ITEM) {
					wt->wcol_theme = &tui->wcol_box;
					wt->state = widget_state;
				}
				else if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
					wt->wcol_theme = &tui->wcol_menu_back;
					wt->state = widget_state;
				}
				break;

			case UI_BTYPE_SEPR:
			case UI_BTYPE_SEPR_LINE:
			case UI_BTYPE_SEPR_SPACER:
				break;

			case UI_BTYPE_BUT:
#ifdef USE_UI_TOOLBAR_HACK
				if (UI_but_is_tool(but)) {
					wt = widget_type(UI_WTYPE_TOOLBAR_ITEM);
				}
				else {
					wt = widget_type(UI_WTYPE_EXEC);
				}
#else
				wt = widget_type(UI_WTYPE_EXEC);
#endif
				break;

			case UI_BTYPE_NUM:
				wt = widget_type(UI_WTYPE_NUMBER);
				break;

			case UI_BTYPE_NUM_SLIDER:
				wt = widget_type(UI_WTYPE_SLIDER);
				break;

			case UI_BTYPE_ROW:
				wt = widget_type(UI_WTYPE_RADIO);
				break;

			case UI_BTYPE_LISTROW:
				wt = widget_type(UI_WTYPE_LISTITEM);
				break;

			case UI_BTYPE_TEXT:
				wt = widget_type(UI_WTYPE_NAME);
				break;

			case UI_BTYPE_SEARCH_MENU:
				wt = widget_type(UI_WTYPE_NAME);
				if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
					wt->wcol_theme = &btheme->tui.wcol_menu_back;
				}
				break;

			case UI_BTYPE_TAB:
				wt = widget_type(UI_WTYPE_TAB);
				break;

			case UI_BTYPE_BUT_TOGGLE:
			case UI_BTYPE_TOGGLE:
			case UI_BTYPE_TOGGLE_N:
				wt = widget_type(UI_WTYPE_TOGGLE);
				break;

			case UI_BTYPE_CHECKBOX:
			case UI_BTYPE_CHECKBOX_N:
				if (!(but->flag & UI_HAS_ICON)) {
					wt = widget_type(UI_WTYPE_CHECKBOX);
					but->drawflag |= UI_BUT_TEXT_LEFT;
				}
				else
					wt = widget_type(UI_WTYPE_TOGGLE);

				/* option buttons have strings outside, on menus use different colors */
				if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
					wt->state = widget_state_option_menu;
				}
				break;

			case UI_BTYPE_MENU:
			case UI_BTYPE_BLOCK:
			case UI_BTYPE_POPOVER:
				if (but->flag & UI_BUT_NODE_LINK) {
					/* new node-link button, not active yet XXX */
					wt = widget_type(UI_WTYPE_MENU_NODE_LINK);
				}
				else {
					/* with menu arrows */

					/* we could use a flag for this, but for now just check size,
					 * add updown arrows if there is room. */
					if ((!but->str[0] && but->icon && (BLI_rcti_size_x(rect) < BLI_rcti_size_y(rect) + 2)) ||
					    /* disable for brushes also */
					    (but->flag & UI_BUT_ICON_PREVIEW))
					{
						/* no arrows */
						wt = widget_type(UI_WTYPE_MENU_ICON_RADIO);
					}
					else {
						wt = widget_type(UI_WTYPE_MENU_RADIO);
					}
				}
				break;

			case UI_BTYPE_PULLDOWN:
				wt = widget_type(UI_WTYPE_PULLDOWN);
				break;

			case UI_BTYPE_BUT_MENU:
				wt = widget_type(UI_WTYPE_MENU_ITEM);
				break;

			case UI_BTYPE_COLOR:
				wt = widget_type(UI_WTYPE_SWATCH);
				break;

			case UI_BTYPE_ROUNDBOX:
			case UI_BTYPE_LISTBOX:
				wt = widget_type(UI_WTYPE_BOX);
				break;

			case UI_BTYPE_EXTRA:
				widget_draw_extra_mask(C, but, widget_type(UI_WTYPE_BOX), rect);
				break;

			case UI_BTYPE_HSVCUBE:
				if (ELEM(but->a1, UI_GRAD_V_ALT, UI_GRAD_L_ALT)) {
					/* vertical V slider, uses new widget draw now */
					ui_draw_but_HSV_v(but, rect);
				}
				else {  /* other HSV pickers... */
					ui_draw_but_HSVCUBE(but, rect);
				}
				break;

			case UI_BTYPE_HSVCIRCLE:
				ui_draw_but_HSVCIRCLE(but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_COLORBAND:
				ui_draw_but_COLORBAND(but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_UNITVEC:
				wt = widget_type(UI_WTYPE_UNITVEC);
				break;

			case UI_BTYPE_IMAGE:
				ui_draw_but_IMAGE(ar, but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_HISTOGRAM:
				ui_draw_but_HISTOGRAM(ar, but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_WAVEFORM:
				ui_draw_but_WAVEFORM(ar, but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_VECTORSCOPE:
				ui_draw_but_VECTORSCOPE(ar, but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_CURVE:
				ui_draw_but_CURVE(ar, but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_PROGRESS_BAR:
				wt = widget_type(UI_WTYPE_PROGRESSBAR);
				fstyle = &style->widgetlabel;
				break;

			case UI_BTYPE_SCROLL:
				wt = widget_type(UI_WTYPE_SCROLL);
				break;

			case UI_BTYPE_GRIP:
				wt = widget_type(UI_WTYPE_ICON);
				break;

			case UI_BTYPE_TRACK_PREVIEW:
				ui_draw_but_TRACKPREVIEW(ar, but, &tui->wcol_regular, rect);
				break;

			case UI_BTYPE_NODE_SOCKET:
				ui_draw_but_NODESOCKET(ar, but, &tui->wcol_regular, rect);
				break;

			default:
				wt = widget_type(UI_WTYPE_REGULAR);
				break;
		}
	}

	if (wt) {
		//rcti disablerect = *rect; /* rect gets clipped smaller for text */
		int roundboxalign, state, drawflag;
		bool disabled = false;

		roundboxalign = widget_roundbox_set(but, rect);

		/* Mask out flags re-used for local state. */
		state = but->flag & ~UI_STATE_FLAGS_ALL;
		drawflag = but->drawflag;

		if (state & UI_SELECT_DRAW) {
			state |= UI_SELECT;
		}

		if ((but->editstr) ||
		    (UNLIKELY(but->flag & UI_BUT_DRAG_MULTI) && ui_but_drag_multi_edit_get(but)))
		{
			state |= UI_STATE_TEXT_INPUT;
		}

		if (but->hold_func) {
			state |= UI_STATE_HOLD_ACTION;
		}

		if (state & UI_ACTIVE) {
			if (but->drawflag & UI_BUT_ACTIVE_LEFT) {
				state |= UI_STATE_ACTIVE_LEFT;
			}
			else if (but->drawflag & UI_BUT_ACTIVE_RIGHT) {
				state |= UI_STATE_ACTIVE_RIGHT;
			}
		}

		if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE))
			if (but->dt != UI_EMBOSS_PULLDOWN)
				disabled = true;

		if (disabled)
			ui_widget_color_disabled(wt);

		wt->state(wt, state, drawflag);
		if (wt->custom)
			wt->custom(but, &wt->wcol, rect, state, roundboxalign);
		else if (wt->draw)
			wt->draw(&wt->wcol, rect, state, roundboxalign);

		if (disabled)
			GPU_blend(true);

#ifdef USE_UI_POPOVER_ONCE
		if (but->block->flag & UI_BLOCK_POPOVER_ONCE) {
			if ((state & UI_ACTIVE) && ui_but_is_popover_once_compat(but)) {
				uiWidgetType wt_back = *wt;
				uiWidgetType *wt_temp = widget_type(UI_WTYPE_MENU_ITEM);
				wt_temp->state(wt_temp, state, drawflag);
				copy_v4_v4_char(wt->wcol.inner, wt->wcol.inner_sel);
				wt->wcol.inner[3] = 128;
				wt->wcol.roundness = 0.5f;
				ui_draw_roundbox(
				        &rect_orig,
				        0.25f * min_ff(BLI_rcti_size_x(&rect_orig), BLI_rcti_size_y(&rect_orig)),
				        &wt_temp->wcol);
				*wt = wt_back;
			}
		}
#endif

		wt->text(fstyle, &wt->wcol, but, rect);
		if (disabled)
			GPU_blend(false);

//		if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE))
//			if (but->dt != UI_EMBOSS_PULLDOWN)
//				widget_disabled(&disablerect);
	}
}

static void ui_draw_clip_tri(uiBlock *block, rcti *rect, uiWidgetType *wt)
{
	if (block) {
		float draw_color[4];
		uchar *color = (uchar *)wt->wcol.text;

		draw_color[0] = ((float)color[0]) / 255.0f;
		draw_color[1] = ((float)color[1]) / 255.0f;
		draw_color[2] = ((float)color[2]) / 255.0f;
		draw_color[3] = 1.0f;

		if (block->flag & UI_BLOCK_CLIPTOP) {
			/* XXX no scaling for UI here yet */
			UI_draw_icon_tri(BLI_rcti_cent_x(rect), rect->ymax - 8, 't', draw_color);
		}
		if (block->flag & UI_BLOCK_CLIPBOTTOM) {
			/* XXX no scaling for UI here yet */
			UI_draw_icon_tri(BLI_rcti_cent_x(rect), rect->ymin + 10, 'v', draw_color);
		}
	}
}

void ui_draw_menu_back(uiStyle *UNUSED(style), uiBlock *block, rcti *rect)
{
	uiWidgetType *wt = widget_type(UI_WTYPE_MENU_BACK);

	wt->state(wt, 0, 0);
	if (block)
		wt->draw(&wt->wcol, rect, block->flag, block->direction);
	else
		wt->draw(&wt->wcol, rect, 0, 0);

	ui_draw_clip_tri(block, rect, wt);
}

/**
 * Similar to 'widget_menu_back', however we can't use the widget preset system
 * because we need to pass in the original location so we know where to show the arrow.
 */
static void ui_draw_popover_back_impl(
        const uiWidgetColors *wcol, rcti *rect, int direction, const float unit_size,
        const float mval_origin[2])
{
	/* tsk, this isn't nice. */
	const float unit_half = unit_size / 2;
	const float cent_x = mval_origin ? mval_origin[0] : BLI_rcti_cent_x(rect);
	rect->ymax -= unit_half;
	rect->ymin += unit_half;

	GPU_blend(true);

	/* Extracted from 'widget_menu_back', keep separate to avoid menu changes breaking popovers */
	{
		uiWidgetBase wtb;
		widget_init(&wtb);

		const int roundboxalign = UI_CNR_ALL;
		widget_softshadow(rect, roundboxalign, wcol->roundness * U.widget_unit);

		round_box_edges(&wtb, roundboxalign, rect, wcol->roundness * U.widget_unit);
		wtb.draw_emboss = false;
		widgetbase_draw(&wtb, wcol);
	}

	/* Draw popover arrow (top/bottom) */
	if (ELEM(direction, UI_DIR_UP, UI_DIR_DOWN)) {
		uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
		immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
		immUniformColor4ubv((uchar *)wcol->inner);
		GPU_blend(true);
		immBegin(GPU_PRIM_TRIS, 3);
		if (direction == UI_DIR_DOWN) {
			const float y = rect->ymax;
			immVertex2f(pos, cent_x - unit_half, y);
			immVertex2f(pos, cent_x + unit_half, y);
			immVertex2f(pos, cent_x, y + unit_half);
		}
		else {
			const float y = rect->ymin;
			immVertex2f(pos, cent_x - unit_half, y);
			immVertex2f(pos, cent_x + unit_half, y);
			immVertex2f(pos, cent_x, y - unit_half);
		}
		immEnd();
		immUnbindProgram();
	}

	GPU_blend(false);
}

void ui_draw_popover_back(ARegion *ar, uiStyle *UNUSED(style), uiBlock *block, rcti *rect)
{
	uiWidgetType *wt = widget_type(UI_WTYPE_MENU_BACK);

	if (block) {
		float mval_origin[2] = {block->mx, block->my};
		ui_window_to_block_fl(ar, block, &mval_origin[0], &mval_origin[1]);
		ui_draw_popover_back_impl(wt->wcol_theme, rect, block->direction, U.widget_unit / block->aspect,  mval_origin);
	}
	else {
		wt->state(wt, 0, 0);
		wt->draw(&wt->wcol, rect, 0, 0);
	}

	ui_draw_clip_tri(block, rect, wt);
}

static void draw_disk_shaded(
        float start, float angle,
        float radius_int, float radius_ext, int subd,
        const char col1[4], const char col2[4],
        bool shaded)
{
	const float radius_ext_scale = (0.5f / radius_ext);  /* 1 / (2 * radius_ext) */
	int i;

	float s, c;
	float y1, y2;
	float fac;
	uchar r_col[4];
	uint pos, col;

	GPUVertFormat *format = immVertexFormat();
	pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	if (shaded) {
		col = GPU_vertformat_attr_add(format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
		immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
	}
	else {
		immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
		immUniformColor4ubv((uchar *)col1);
	}

	immBegin(GPU_PRIM_TRI_STRIP, subd * 2);
	for (i = 0; i < subd; i++) {
		float a;

		a = start + ((i) / (float)(subd - 1)) * angle;
		s = sinf(a);
		c = cosf(a);
		y1 = s * radius_int;
		y2 = s * radius_ext;

		if (shaded) {
			fac = (y1 + radius_ext) * radius_ext_scale;
			round_box_shade_col4_r(r_col, col1, col2, fac);
			immAttr4ubv(col, r_col);
		}
		immVertex2f(pos, c * radius_int, s * radius_int);

		if (shaded) {
			fac = (y2 + radius_ext) * radius_ext_scale;
			round_box_shade_col4_r(r_col, col1, col2, fac);
			immAttr4ubv(col, r_col);
		}
		immVertex2f(pos, c * radius_ext, s * radius_ext);
	}
	immEnd();

	immUnbindProgram();
}

void ui_draw_pie_center(uiBlock *block)
{
	bTheme *btheme = UI_GetTheme();
	float cx = block->pie_data.pie_center_spawned[0];
	float cy = block->pie_data.pie_center_spawned[1];

	float *pie_dir = block->pie_data.pie_dir;

	float pie_radius_internal = U.dpi_fac * U.pie_menu_threshold;
	float pie_radius_external = U.dpi_fac * (U.pie_menu_threshold + 7.0f);

	int subd = 40;

	float angle = atan2f(pie_dir[1], pie_dir[0]);
	float range = (block->pie_data.flags & UI_PIE_DEGREES_RANGE_LARGE) ? M_PI_2 : M_PI_4;

	GPU_matrix_push();
	GPU_matrix_translate_2f(cx, cy);

	GPU_blend(true);
	if (btheme->tui.wcol_pie_menu.shaded) {
		char col1[4], col2[4];
		shadecolors4(col1, col2, btheme->tui.wcol_pie_menu.inner, btheme->tui.wcol_pie_menu.shadetop, btheme->tui.wcol_pie_menu.shadedown);
		draw_disk_shaded(0.0f, (float)(M_PI * 2.0), pie_radius_internal, pie_radius_external, subd, col1, col2, true);
	}
	else {
		draw_disk_shaded(0.0f, (float)(M_PI * 2.0), pie_radius_internal, pie_radius_external, subd, btheme->tui.wcol_pie_menu.inner, NULL, false);
	}

	if (!(block->pie_data.flags & UI_PIE_INVALID_DIR)) {
		if (btheme->tui.wcol_pie_menu.shaded) {
			char col1[4], col2[4];
			shadecolors4(col1, col2, btheme->tui.wcol_pie_menu.inner_sel, btheme->tui.wcol_pie_menu.shadetop, btheme->tui.wcol_pie_menu.shadedown);
			draw_disk_shaded(angle - range / 2.0f, range, pie_radius_internal, pie_radius_external, subd, col1, col2, true);
		}
		else {
			draw_disk_shaded(angle - range / 2.0f, range, pie_radius_internal, pie_radius_external, subd, btheme->tui.wcol_pie_menu.inner_sel, NULL, false);
		}
	}

	GPUVertFormat *format = immVertexFormat();
	uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
	immUniformColor4ubv((uchar *)btheme->tui.wcol_pie_menu.outline);

	imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_internal, subd);
	imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_external, subd);

	immUnbindProgram();

	if (U.pie_menu_confirm > 0 && !(block->pie_data.flags & (UI_PIE_INVALID_DIR | UI_PIE_CLICK_STYLE))) {
		float pie_confirm_radius = U.dpi_fac * (pie_radius_internal + U.pie_menu_confirm);
		float pie_confirm_external = U.dpi_fac * (pie_radius_internal + U.pie_menu_confirm + 7.0f);

		const char col[4] = {btheme->tui.wcol_pie_menu.text_sel[0],
		                     btheme->tui.wcol_pie_menu.text_sel[1],
		                     btheme->tui.wcol_pie_menu.text_sel[2],
		                     64};

		draw_disk_shaded(angle - range / 2.0f, range, pie_confirm_radius, pie_confirm_external, subd, col, NULL, false);
	}

	GPU_blend(false);
	GPU_matrix_pop();
}


const uiWidgetColors *ui_tooltip_get_theme(void)
{
	uiWidgetType *wt = widget_type(UI_WTYPE_TOOLTIP);
	return wt->wcol_theme;
}

/**
 * Generic drawing for background.
 */
void ui_draw_widget_back_color(
        uiWidgetTypeEnum type, bool use_shadow, const rcti *rect,
        const float color[4])
{
	uiWidgetType *wt = widget_type(type);

	if (use_shadow) {
		GPU_blend(true);
		GPU_blend_set_func_separate(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
		widget_softshadow(rect, UI_CNR_ALL, 0.25f * U.widget_unit);
		GPU_blend(false);
	}

	rcti rect_copy = *rect;
	wt->state(wt, 0, 0);
	if (color) {
		rgba_float_to_uchar((uchar *)wt->wcol.inner, color);
	}
	wt->draw(&wt->wcol, &rect_copy, 0, UI_CNR_ALL);
}
void ui_draw_widget_back(uiWidgetTypeEnum type, bool use_shadow, const rcti *rect)
{
	ui_draw_widget_back_color(type, use_shadow, rect, NULL);
}

void ui_draw_tooltip_background(uiStyle *UNUSED(style), uiBlock *UNUSED(block), rcti *rect)
{
	uiWidgetType *wt = widget_type(UI_WTYPE_TOOLTIP);
	wt->state(wt, 0, 0);
	/* wt->draw ends up using same function to draw the tooltip as menu_back */
	wt->draw(&wt->wcol, rect, 0, 0);
}

/* helper call to draw a menu item without button */
/* state: UI_ACTIVE or 0 */
void ui_draw_menu_item(const uiFontStyle *fstyle, rcti *rect, const char *name, int iconid, int state, bool use_sep)
{
	uiWidgetType *wt = widget_type(UI_WTYPE_MENU_ITEM);
	rcti _rect = *rect;
	char *cpoin = NULL;

	wt->state(wt, state, 0);
	wt->draw(&wt->wcol, rect, 0, 0);

	UI_fontstyle_set(fstyle);

	/* text location offset */
	rect->xmin += 0.25f * UI_UNIT_X;
	if (iconid) rect->xmin += UI_DPI_ICON_SIZE;

	/* cut string in 2 parts? */
	if (use_sep) {
		cpoin = strchr(name, UI_SEP_CHAR);
		if (cpoin) {
			*cpoin = 0;

			/* need to set this first */
			UI_fontstyle_set(fstyle);

			if (fstyle->kerning == 1) { /* for BLF_width */
				BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
			}

			rect->xmax -= BLF_width(fstyle->uifont_id, cpoin + 1, INT_MAX) + UI_DPI_ICON_SIZE;

			if (fstyle->kerning == 1) {
				BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
			}
		}
	}

	{
		char drawstr[UI_MAX_DRAW_STR];
		const float okwidth = (float)BLI_rcti_size_x(rect);
		const size_t max_len = sizeof(drawstr);
		const float minwidth = (float)(UI_DPI_ICON_SIZE);

		BLI_strncpy(drawstr, name, sizeof(drawstr));
		if (drawstr[0]) {
			UI_text_clip_middle_ex(fstyle, drawstr, okwidth, minwidth, max_len, '\0');
		}

		UI_fontstyle_draw(
		        fstyle, rect, drawstr, (uchar *)wt->wcol.text,
		        &(struct uiFontStyleDraw_Params) { .align = UI_STYLE_TEXT_LEFT, });
	}

	/* part text right aligned */
	if (use_sep) {
		if (cpoin) {
			rect->xmax = _rect.xmax - 5;
			UI_fontstyle_draw(
			        fstyle, rect, cpoin + 1, (uchar *)wt->wcol.text,
			        &(struct uiFontStyleDraw_Params) { .align = UI_STYLE_TEXT_RIGHT, });
			*cpoin = UI_SEP_CHAR;
		}
	}

	/* restore rect, was messed with */
	*rect = _rect;

	if (iconid) {
		float height, aspect;
		int xs = rect->xmin + 0.2f * UI_UNIT_X;
		int ys = rect->ymin + 0.1f * BLI_rcti_size_y(rect);

		height = ICON_SIZE_FROM_BUTRECT(rect);
		aspect = ICON_DEFAULT_HEIGHT / height;

		GPU_blend(true);
		/* XXX scale weak get from fstyle? */
		UI_icon_draw_aspect(xs, ys, iconid, aspect, 1.0f, wt->wcol.text);
		GPU_blend(false);
	}
}

void ui_draw_preview_item(const uiFontStyle *fstyle, rcti *rect, const char *name, int iconid, int state)
{
	rcti trect = *rect;
	const float text_size = UI_UNIT_Y;
	float font_dims[2] = {0.0f, 0.0f};
	uiWidgetType *wt = widget_type(UI_WTYPE_MENU_ITEM);

	/* drawing button background */
	wt->state(wt, state, 0);
	wt->draw(&wt->wcol, rect, 0, 0);

	/* draw icon in rect above the space reserved for the label */
	rect->ymin += text_size;
	GPU_blend(true);
	widget_draw_preview(iconid, 1.0f, rect);
	GPU_blend(false);

	BLF_width_and_height(fstyle->uifont_id, name, BLF_DRAW_STR_DUMMY_MAX, &font_dims[0], &font_dims[1]);

	/* text rect */
	trect.xmin += 0;
	trect.xmax = trect.xmin + font_dims[0] + U.widget_unit / 2;
	trect.ymin += U.widget_unit / 2;
	trect.ymax = trect.ymin + font_dims[1];
	if (trect.xmax > rect->xmax - PREVIEW_PAD)
		trect.xmax = rect->xmax - PREVIEW_PAD;

	{
		char drawstr[UI_MAX_DRAW_STR];
		const float okwidth = (float)BLI_rcti_size_x(&trect);
		const size_t max_len = sizeof(drawstr);
		const float minwidth = (float)(UI_DPI_ICON_SIZE);

		BLI_strncpy(drawstr, name, sizeof(drawstr));
		UI_text_clip_middle_ex(fstyle, drawstr, okwidth, minwidth, max_len, '\0');

		UI_fontstyle_draw(
		        fstyle, &trect, drawstr, (uchar *)wt->wcol.text,
		        &(struct uiFontStyleDraw_Params) { .align = UI_STYLE_TEXT_CENTER, });
	}
}

/** \} */