blender-archive/source/blender/draw/modes/edit_armature_mode.c

/*
 * 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.
 *
 * Copyright 2016, Blender Foundation.
 */

/** \file
 * \ingroup draw
 */

#include "DRW_engine.h"
#include "DRW_render.h"

#include "DNA_armature_types.h"
#include "DNA_view3d_types.h"

#include "draw_common.h"
#include "draw_mode_engines.h"

/* *********** LISTS *********** */
typedef struct EDIT_ARMATURE_PassList {
	struct DRWPass *bone_solid[2];
	struct DRWPass *bone_transp[2];
	struct DRWPass *bone_wire[2];
	struct DRWPass *bone_outline[2];
	struct DRWPass *bone_envelope[2];
	struct DRWPass *bone_axes;
	struct DRWPass *relationship[2];
} EDIT_ARMATURE_PassList;

typedef struct EDIT_ARMATURE_StorageList {
	struct EDIT_ARMATURE_PrivateData *g_data;
} EDIT_ARMATURE_StorageList;

typedef struct EDIT_ARMATURE_Data {
	void *engine_type;
	DRWViewportEmptyList *fbl;
	DRWViewportEmptyList *txl;
	EDIT_ARMATURE_PassList *psl;
	EDIT_ARMATURE_StorageList *stl;
} EDIT_ARMATURE_Data;

/* *********** STATIC *********** */

typedef struct EDIT_ARMATURE_PrivateData {
	bool transparent_bones;
} EDIT_ARMATURE_PrivateData; /* Transient data */

/* *********** FUNCTIONS *********** */

static void EDIT_ARMATURE_cache_init(void *vedata)
{
	EDIT_ARMATURE_PassList *psl = ((EDIT_ARMATURE_Data *)vedata)->psl;
	EDIT_ARMATURE_StorageList *stl = ((EDIT_ARMATURE_Data *)vedata)->stl;
	const DRWContextState *draw_ctx = DRW_context_state_get();

	if (!stl->g_data) {
		/* Alloc transient pointers */
		stl->g_data = MEM_callocN(sizeof(*stl->g_data), __func__);
	}
	stl->g_data->transparent_bones = (draw_ctx->v3d->shading.type == OB_WIRE) ||
	                                 (draw_ctx->v3d->overlay.arm_flag & V3D_OVERLAY_ARM_TRANSP_BONES) != 0;

	for (int i = 0; i < 2; ++i) {
		/* Solid bones */
		DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_CULL_BACK;
		psl->bone_solid[i] = DRW_pass_create("Bone Solid Pass", state | DRW_STATE_WRITE_DEPTH);
		psl->bone_transp[i] = DRW_pass_create("Bone Transp Pass", state | DRW_STATE_BLEND);

		/* Bones Outline */
		state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL;
		psl->bone_outline[i] = DRW_pass_create("Bone Outline Pass", state);

		/* Wire bones */
		state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_BLEND;
		psl->bone_wire[i] = DRW_pass_create("Bone Wire Pass", state);

		/* distance outline around envelope bones */
		state = DRW_STATE_ADDITIVE | DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_CULL_FRONT;
		psl->bone_envelope[i] = DRW_pass_create("Bone Envelope Outline Pass", state);

		state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL |
		        DRW_STATE_BLEND | DRW_STATE_WIRE;
		psl->relationship[i] = DRW_pass_create("Bone Relationship Pass", state);
	}

	{
		DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_WIRE_SMOOTH | DRW_STATE_BLEND;
		psl->bone_axes = DRW_pass_create("Bone Axes Pass", state);
	}
}

static void EDIT_ARMATURE_cache_populate(void *vedata, Object *ob)
{
	bArmature *arm = ob->data;

	if (ob->type == OB_ARMATURE) {
		if (arm->edbo) {
			EDIT_ARMATURE_PassList *psl = ((EDIT_ARMATURE_Data *)vedata)->psl;
			EDIT_ARMATURE_StorageList *stl = ((EDIT_ARMATURE_Data *)vedata)->stl;

			int ghost = (ob->dtx & OB_DRAWXRAY) ? 1 : 0;
			bool transp = (stl->g_data->transparent_bones || (ob->dt <= OB_WIRE));

			DRWArmaturePasses passes = {
			    .bone_solid = (transp) ? psl->bone_transp[ghost] : psl->bone_solid[ghost],
			    .bone_outline = psl->bone_outline[ghost],
			    .bone_wire = psl->bone_wire[ghost],
			    .bone_envelope = psl->bone_envelope[ghost],
			    .bone_axes = psl->bone_axes,
			    .relationship_lines = psl->relationship[ghost],
			};
			DRW_shgroup_armature_edit(ob, passes, transp);
		}
	}
}

static void EDIT_ARMATURE_draw_scene(void *vedata)
{
	EDIT_ARMATURE_PassList *psl = ((EDIT_ARMATURE_Data *)vedata)->psl;
	DefaultFramebufferList *dfbl = DRW_viewport_framebuffer_list_get();
	DefaultTextureList *dtxl = DRW_viewport_texture_list_get();

	DRW_draw_pass(psl->bone_envelope[0]);

	/* For performance reason, avoid blending on MS target. */
	DRW_draw_pass(psl->bone_transp[0]);

	MULTISAMPLE_SYNC_ENABLE(dfbl, dtxl);

	DRW_draw_pass(psl->bone_solid[0]);
	DRW_draw_pass(psl->bone_outline[0]);
	DRW_draw_pass(psl->bone_wire[0]);
	DRW_draw_pass(psl->relationship[0]);

	MULTISAMPLE_SYNC_DISABLE(dfbl, dtxl);

	if (!DRW_pass_is_empty(psl->bone_envelope[1]) ||
	    !DRW_pass_is_empty(psl->bone_solid[1]) ||
	    !DRW_pass_is_empty(psl->bone_transp[1]) ||
	    !DRW_pass_is_empty(psl->bone_outline[1]) ||
	    !DRW_pass_is_empty(psl->bone_wire[1]) ||
	    !DRW_pass_is_empty(psl->relationship[1]))
	{
		if (DRW_state_is_fbo()) {
			GPU_framebuffer_bind(dfbl->default_fb);
			GPU_framebuffer_clear_depth(dfbl->default_fb, 1.0f);
		}

		DRW_draw_pass(psl->bone_envelope[1]);
		DRW_draw_pass(psl->bone_solid[1]);
		DRW_draw_pass(psl->bone_transp[1]);
		DRW_draw_pass(psl->bone_outline[1]);
		DRW_draw_pass(psl->bone_wire[1]);
		DRW_draw_pass(psl->relationship[1]);
	}

	/* Draw axes with linesmooth and outside of multisample buffer. */
	DRW_draw_pass(psl->bone_axes);
}

static const DrawEngineDataSize EDIT_ARMATURE_data_size = DRW_VIEWPORT_DATA_SIZE(EDIT_ARMATURE_Data);

DrawEngineType draw_engine_edit_armature_type = {
	NULL, NULL,
	N_("EditArmatureMode"),
	&EDIT_ARMATURE_data_size,
	NULL,
	NULL,
	&EDIT_ARMATURE_cache_init,
	&EDIT_ARMATURE_cache_populate,
	NULL,
	NULL,
	&EDIT_ARMATURE_draw_scene,
	NULL,
	NULL,
};