blender-archive/source/blender/editors/space_view3d/view3d_draw_legacy.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.
 *
 * The Original Code is Copyright (C) 2008 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup spview3d
 */

#include <string.h>
#include <stdio.h>
#include <math.h>

#include "DNA_armature_types.h"
#include "DNA_camera_types.h"
#include "DNA_collection_types.h"
#include "DNA_customdata_types.h"
#include "DNA_object_types.h"
#include "DNA_mesh_types.h"
#include "DNA_key_types.h"
#include "DNA_light_types.h"
#include "DNA_scene_types.h"
#include "DNA_world_types.h"
#include "DNA_brush_types.h"

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "BLI_endian_switch.h"
#include "BLI_threads.h"

#include "BKE_anim.h"
#include "BKE_camera.h"
#include "BKE_context.h"
#include "BKE_customdata.h"
#include "BKE_image.h"
#include "BKE_key.h"
#include "BKE_layer.h"
#include "BKE_object.h"
#include "BKE_global.h"
#include "BKE_paint.h"
#include "BKE_scene.h"
#include "BKE_unit.h"
#include "BKE_movieclip.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"

#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_colormanagement.h"

#include "BIF_glutil.h"

#include "WM_api.h"
#include "WM_types.h"

#include "BLF_api.h"
#include "BLT_translation.h"

#include "ED_armature.h"
#include "ED_keyframing.h"
#include "ED_gpencil.h"
#include "ED_screen.h"
#include "ED_space_api.h"
#include "ED_screen_types.h"
#include "ED_transform.h"
#include "ED_view3d.h"

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

#include "GPU_draw.h"
#include "GPU_framebuffer.h"
#include "GPU_material.h"
#include "GPU_extensions.h"
#include "GPU_immediate.h"
#include "GPU_immediate_util.h"
#include "GPU_select.h"
#include "GPU_matrix.h"
#include "GPU_state.h"
#include "GPU_viewport.h"

#include "RE_engine.h"

#include "DRW_engine.h"

#include "view3d_intern.h"  /* own include */

/* ********* custom clipping *********** */

/* Legacy 2.7x, now use shaders that use clip distance instead.
 * Remove once clipping is working properly. */
#define USE_CLIP_PLANES

void ED_view3d_clipping_set(RegionView3D *rv3d)
{
#ifdef USE_CLIP_PLANES
	double plane[4];
	const uint tot = (rv3d->viewlock & RV3D_BOXCLIP) ? 4 : 6;

	for (unsigned a = 0; a < tot; a++) {
		copy_v4db_v4fl(plane, rv3d->clip[a]);
		glClipPlane(GL_CLIP_PLANE0 + a, plane);
		glEnable(GL_CLIP_PLANE0 + a);
		glEnable(GL_CLIP_DISTANCE0 + a);
	}
#else
	for (unsigned a = 0; a < 6; a++) {
		glEnable(GL_CLIP_DISTANCE0 + a);
	}
#endif
}

/* use these to temp disable/enable clipping when 'rv3d->rflag & RV3D_CLIPPING' is set */
void ED_view3d_clipping_disable(void)
{
	for (unsigned a = 0; a < 6; a++) {
#ifdef USE_CLIP_PLANES
		glDisable(GL_CLIP_PLANE0 + a);
#endif
		glDisable(GL_CLIP_DISTANCE0 + a);
	}
}
void ED_view3d_clipping_enable(void)
{
	for (unsigned a = 0; a < 6; a++) {
#ifdef USE_CLIP_PLANES
		glEnable(GL_CLIP_PLANE0 + a);
#endif
		glEnable(GL_CLIP_DISTANCE0 + a);
	}
}

/* *********************** backdraw for selection *************** */

static void validate_object_select_id(
        struct Depsgraph *depsgraph, Scene *scene,
        ARegion *ar, View3D *v3d,
        Object *obact, Object *obedit,
        short select_mode)
{
	RegionView3D *rv3d = ar->regiondata;
	Scene *scene_eval = (Scene *)DEG_get_evaluated_id(depsgraph, &scene->id);
	Object *obact_eval = DEG_get_evaluated_object(depsgraph, obact);

	BLI_assert(ar->regiontype == RGN_TYPE_WINDOW);

	if (obact_eval && (obact_eval->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT) ||
	             BKE_paint_select_face_test(obact_eval)))
	{
		/* do nothing */
	}
	/* texture paint mode sampling */
	else if (obact_eval && (obact_eval->mode & OB_MODE_TEXTURE_PAINT) &&
	         (v3d->shading.type > OB_WIRE))
	{
		/* do nothing */
	}
	else if ((obact_eval && (obact_eval->mode & OB_MODE_PARTICLE_EDIT)) &&
	         !XRAY_ENABLED(v3d))
	{
		/* do nothing */
	}
	else if ((obedit && (obedit->mode & OB_MODE_EDIT)) &&
	         !XRAY_FLAG_ENABLED(v3d))
	{
		/* do nothing */
	}
	else {
		v3d->flag &= ~V3D_INVALID_BACKBUF;
		return;
	}

	if (!(v3d->flag & V3D_INVALID_BACKBUF)) {
		return;
	}

#if 0
	if (test) {
		if (qtest()) {
			addafterqueue(ar->win, BACKBUFDRAW, 1);
			return;
		}
	}
#endif

#if 0 /* v3d->zbuf deprecated */
	if (v3d->shading.type > OB_WIRE) {
		v3d->zbuf = true;
	}
#endif

	G.f |= G_FLAG_BACKBUFSEL;

	if (obact_eval && ((obact_eval->base_flag & BASE_VISIBLE) != 0)) {
		DRW_framebuffer_select_id_setup(ar, true);
		draw_object_select_id(depsgraph, scene_eval, v3d, rv3d, obact_eval, select_mode);
		DRW_framebuffer_select_id_release(ar);
	}

	/* TODO: Create a flag in `DRW_manager` because the drawing is no longer
	 *       made on the backbuffer in this case. */
	v3d->flag &= ~V3D_INVALID_BACKBUF;

	G.f &= ~G_FLAG_BACKBUFSEL;
}

void view3d_opengl_read_pixels(ARegion *ar, int x, int y, int w, int h, int format, int type, void *data)
{
	glReadPixels(ar->winrct.xmin + x, ar->winrct.ymin + y, w, h, format, type, data);
}

/* TODO: Creating, attaching texture, and destroying a framebuffer is quite slow.
 *       Calling this function should be avoided during interactive drawing. */
static void view3d_opengl_read_Z_pixels(GPUViewport *viewport, rcti *rect, void *data)
{
	DefaultTextureList *dtxl = (DefaultTextureList *)GPU_viewport_texture_list_get(viewport);

	GPUFrameBuffer *tmp_fb = GPU_framebuffer_create();
	GPU_framebuffer_texture_attach(tmp_fb, dtxl->depth, 0, 0);
	GPU_framebuffer_bind(tmp_fb);
	glDisable(GL_SCISSOR_TEST);

	glReadPixels(rect->xmin, rect->ymin,
	             BLI_rcti_size_x(rect), BLI_rcti_size_y(rect),
	             GL_DEPTH_COMPONENT, GL_FLOAT, data);

	glEnable(GL_SCISSOR_TEST);
	GPU_framebuffer_restore();

	GPU_framebuffer_free(tmp_fb);
}

void ED_view3d_select_id_validate_with_select_mode(ViewContext *vc, short select_mode)
{
	/* TODO: Create a flag in `DRW_manager` because the drawing is no longer
	 *       made on the backbuffer in this case. */
	if (vc->v3d->flag & V3D_INVALID_BACKBUF) {
		validate_object_select_id(
		        vc->depsgraph, vc->scene, vc->ar, vc->v3d,
		        vc->obact, vc->obedit, select_mode);
	}
}

void ED_view3d_select_id_validate(ViewContext *vc)
{
	ED_view3d_select_id_validate_with_select_mode(vc, -1);
}

void ED_view3d_backbuf_depth_validate(ViewContext *vc)
{
	if (vc->v3d->flag & V3D_INVALID_BACKBUF) {
		ARegion *ar = vc->ar;
		RegionView3D *rv3d = ar->regiondata;
		Object *obact_eval = DEG_get_evaluated_object(vc->depsgraph, vc->obact);

		if (obact_eval && ((obact_eval->base_flag & BASE_VISIBLE) != 0)) {
			GPU_scissor(ar->winrct.xmin, ar->winrct.ymin,
			            BLI_rcti_size_x(&ar->winrct),
			            BLI_rcti_size_y(&ar->winrct));

			GPU_depth_test(true);
			GPU_clear(GPU_DEPTH_BIT);

			if (rv3d->rflag & RV3D_CLIPPING) {
				ED_view3d_clipping_set(rv3d);
			}

			draw_object_depth(rv3d, obact_eval);

			if (rv3d->rflag & RV3D_CLIPPING) {
				ED_view3d_clipping_disable();
			}

			GPU_depth_test(false);
		}

		vc->v3d->flag &= ~V3D_INVALID_BACKBUF;
	}
}

uint *ED_view3d_select_id_read_rect(ViewContext *vc, const rcti *clip, uint *r_buf_len)
{
	ED_view3d_select_id_validate(vc);

	uint width = BLI_rcti_size_x(clip);
	uint height = BLI_rcti_size_y(clip);
	uint buf_len = width * height;
	uint *buf = MEM_mallocN(buf_len * sizeof(*buf), __func__);

	DRW_framebuffer_select_id_read(clip, buf);

	if (r_buf_len) {
		*r_buf_len = buf_len;
	}

	return buf;
}

/**
 * allow for small values [0.5 - 2.5],
 * and large values, FLT_MAX by clamping by the area size
 */
int ED_view3d_backbuf_sample_size_clamp(ARegion *ar, const float dist)
{
	return (int)min_ff(ceilf(dist), (float)max_ii(ar->winx, ar->winx));
}

/* samples a single pixel (copied from vpaint) */
uint ED_view3d_select_id_sample(
        ViewContext *vc, int x, int y)
{
	if (x >= vc->ar->winx || y >= vc->ar->winy) {
		return 0;
	}

	uint buf_len;
	uint *buf = ED_view3d_select_id_read(vc, x, y, x, y, &buf_len);
	BLI_assert(0 != buf_len);
	uint ret = buf[0];
	MEM_freeN(buf);

	return ret;
}

/* reads full rect, converts indices */
uint *ED_view3d_select_id_read(
        ViewContext *vc, int xmin, int ymin, int xmax, int ymax, uint *r_buf_len)
{
	if (UNLIKELY((xmin > xmax) || (ymin > ymax))) {
		return NULL;
	}

	const rcti rect = {
		.xmin = xmin, .xmax = xmax + 1,
		.ymin = ymin, .ymax = ymax + 1,
	};

	uint buf_len;
	uint *buf = ED_view3d_select_id_read_rect(vc, &rect, &buf_len);

	if (r_buf_len) {
		*r_buf_len = buf_len;
	}

	return buf;
}

/* smart function to sample a rect spiralling outside, nice for backbuf selection */
uint ED_view3d_select_id_read_nearest(
        struct ViewContext *UNUSED(vc), const int mval[2],
        const uint id_min, const uint id_max, uint *r_dist)
{
	/* Create region around mouse cursor. This must be square and have an odd
	 * width, the spiralling algorithm does not work with arbitrary rectangles. */
	rcti rect;
	BLI_rcti_init_pt_radius(&rect, mval, *r_dist);
	rect.xmax += 1;
	rect.ymax += 1;

	int width = BLI_rcti_size_x(&rect);
	int height = width;
	BLI_assert(width == height);

	/* Read from selection framebuffer. */
	uint *buf = MEM_mallocN(width * height * sizeof(*buf), __func__);
	DRW_framebuffer_select_id_read(&rect, buf);

	/* Spiral, starting from center of buffer. */
	int spiral_offset = height * (int)(width / 2) + (height / 2);
	int spiral_direction = 0;

	uint index = 0;

	for (int nr = 1; nr <= height; nr++) {
		for (int a = 0; a < 2; a++) {
			for (int b = 0; b < nr; b++) {
				/* Find hit within the specified range. */
				uint hit_id = buf[spiral_offset];

				if (hit_id && hit_id >= id_min && hit_id < id_max) {
					/* Get x/y from spiral offset. */
					int hit_x = spiral_offset % width;
					int hit_y = spiral_offset / width;

					int center_x = width / 2;
					int center_y = height / 2;

					/* Manhatten distance in keeping with other screen-based selection. */
					*r_dist = (uint)(abs(hit_x - center_x) + abs(hit_y - center_y));

					/* Indices start at 1 here. */
					index = (hit_id - id_min) + 1;
					goto exit;
				}

				/* Next spiral step. */
				if (spiral_direction == 0) {
					spiral_offset += 1; /* right */
				}
				else if (spiral_direction == 1) {
					spiral_offset -= width; /* down */
				}
				else if (spiral_direction == 2) {
					spiral_offset -= 1; /* left */
				}
				else {
					spiral_offset += width; /* up */
				}

				/* Stop if we are outside the buffer. */
				if (spiral_offset < 0 || spiral_offset >= width * height) {
					goto exit;
				}
			}

			spiral_direction = (spiral_direction + 1) % 4;
		}
	}

exit:
	MEM_freeN(buf);
	return index;
}


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

static void view3d_stereo_bgpic_setup(Scene *scene, View3D *v3d, Image *ima, ImageUser *iuser)
{
	if (BKE_image_is_stereo(ima)) {
		iuser->flag |= IMA_SHOW_STEREO;

		if ((scene->r.scemode & R_MULTIVIEW) == 0) {
			iuser->multiview_eye = STEREO_LEFT_ID;
		}
		else if (v3d->stereo3d_camera != STEREO_3D_ID) {
			/* show only left or right camera */
			iuser->multiview_eye = v3d->stereo3d_camera;
		}

		BKE_image_multiview_index(ima, iuser);
	}
	else {
		iuser->flag &= ~IMA_SHOW_STEREO;
	}
}

static void view3d_draw_bgpic(Scene *scene, Depsgraph *depsgraph,
                              ARegion *ar, View3D *v3d,
                              const bool do_foreground, const bool do_camera_frame)
{
	RegionView3D *rv3d = ar->regiondata;
	int fg_flag = do_foreground ? CAM_BGIMG_FLAG_FOREGROUND : 0;
	if (v3d->camera == NULL || v3d->camera->type != OB_CAMERA) {
		return;
	}
	Camera *cam = v3d->camera->data;

	for (CameraBGImage *bgpic = cam->bg_images.first; bgpic; bgpic = bgpic->next) {
		if ((bgpic->flag & CAM_BGIMG_FLAG_FOREGROUND) != fg_flag) {
			continue;
		}

		{
			float image_aspect[2];
			float x1, y1, x2, y2, centx, centy;

			void *lock;

			Image *ima = NULL;

			/* disable individual images */
			if ((bgpic->flag & CAM_BGIMG_FLAG_DISABLED)) {
				continue;
			}

			ImBuf *ibuf = NULL;
			ImBuf *freeibuf = NULL;
			ImBuf *releaseibuf = NULL;
			if (bgpic->source == CAM_BGIMG_SOURCE_IMAGE) {
				ima = bgpic->ima;
				if (ima == NULL) {
					continue;
				}

				ImageUser iuser = bgpic->iuser;
				iuser.scene = scene;  /* Needed for render results. */
				BKE_image_user_frame_calc(&iuser, (int)DEG_get_ctime(depsgraph));
				if (ima->source == IMA_SRC_SEQUENCE && !(iuser.flag & IMA_USER_FRAME_IN_RANGE)) {
					ibuf = NULL; /* frame is out of range, dont show */
				}
				else {
					view3d_stereo_bgpic_setup(scene, v3d, ima, &iuser);
					ibuf = BKE_image_acquire_ibuf(ima, &iuser, &lock);
					releaseibuf = ibuf;
				}

				image_aspect[0] = ima->aspx;
				image_aspect[1] = ima->aspy;
			}
			else if (bgpic->source == CAM_BGIMG_SOURCE_MOVIE) {
				/* TODO: skip drawing when out of frame range (as image sequences do above) */
				MovieClip *clip = NULL;

				if (bgpic->flag & CAM_BGIMG_FLAG_CAMERACLIP) {
					if (scene->camera) {
						clip = BKE_object_movieclip_get(scene, scene->camera, true);
					}
				}
				else {
					clip = bgpic->clip;
				}

				if (clip == NULL) {
					continue;
				}

				BKE_movieclip_user_set_frame(&bgpic->cuser, (int)DEG_get_ctime(depsgraph));
				ibuf = BKE_movieclip_get_ibuf(clip, &bgpic->cuser);

				image_aspect[0] = clip->aspx;
				image_aspect[1] = clip->aspy;

				/* working with ibuf from image and clip has got different workflow now.
				 * ibuf acquired from clip is referenced by cache system and should
				 * be dereferenced after usage. */
				freeibuf = ibuf;
			}
			else {
				/* perhaps when loading future files... */
				BLI_assert(0);
				copy_v2_fl(image_aspect, 1.0f);
			}

			if (ibuf == NULL) {
				continue;
			}

			if ((ibuf->rect == NULL && ibuf->rect_float == NULL) || ibuf->channels != 4) {
				/* invalid image format */
				if (freeibuf) {
					IMB_freeImBuf(freeibuf);
				}
				if (releaseibuf) {
					BKE_image_release_ibuf(ima, releaseibuf, lock);
				}

				continue;
			}

			if (ibuf->rect == NULL) {
				IMB_rect_from_float(ibuf);
			}

			BLI_assert(rv3d->persp == RV3D_CAMOB);
			{
				if (do_camera_frame) {
					rctf vb;
					ED_view3d_calc_camera_border(scene, depsgraph, ar, v3d, rv3d, &vb, false);
					x1 = vb.xmin;
					y1 = vb.ymin;
					x2 = vb.xmax;
					y2 = vb.ymax;
				}
				else {
					x1 = ar->winrct.xmin;
					y1 = ar->winrct.ymin;
					x2 = ar->winrct.xmax;
					y2 = ar->winrct.ymax;
				}

				/* apply offset last - camera offset is different to offset in blender units */
				/* so this has some sane way of working - this matches camera's shift _exactly_ */
				{
					const float max_dim = max_ff(x2 - x1, y2 - y1);
					const float xof_scale = bgpic->offset[0] * max_dim;
					const float yof_scale = bgpic->offset[1] * max_dim;

					x1 += xof_scale;
					y1 += yof_scale;
					x2 += xof_scale;
					y2 += yof_scale;
				}

				centx = (x1 + x2) * 0.5f;
				centy = (y1 + y2) * 0.5f;

				/* aspect correction */
				if (bgpic->flag & CAM_BGIMG_FLAG_CAMERA_ASPECT) {
					/* apply aspect from clip */
					const float w_src = ibuf->x * image_aspect[0];
					const float h_src = ibuf->y * image_aspect[1];

					/* destination aspect is already applied from the camera frame */
					const float w_dst = x1 - x2;
					const float h_dst = y1 - y2;

					const float asp_src = w_src / h_src;
					const float asp_dst = w_dst / h_dst;

					if (fabsf(asp_src - asp_dst) >= FLT_EPSILON) {
						if ((asp_src > asp_dst) == ((bgpic->flag & CAM_BGIMG_FLAG_CAMERA_CROP) != 0)) {
							/* fit X */
							const float div = asp_src / asp_dst;
							x1 = ((x1 - centx) * div) + centx;
							x2 = ((x2 - centx) * div) + centx;
						}
						else {
							/* fit Y */
							const float div = asp_dst / asp_src;
							y1 = ((y1 - centy) * div) + centy;
							y2 = ((y2 - centy) * div) + centy;
						}
					}
				}
			}

			/* complete clip? */
			rctf clip_rect;
			BLI_rctf_init(&clip_rect, x1, x2, y1, y2);
			if (bgpic->rotation) {
				BLI_rctf_rotate_expand(&clip_rect, &clip_rect, bgpic->rotation);
			}

			if (clip_rect.xmax < 0 || clip_rect.ymax < 0 || clip_rect.xmin > ar->winx || clip_rect.ymin > ar->winy) {
				if (freeibuf) {
					IMB_freeImBuf(freeibuf);
				}
				if (releaseibuf) {
					BKE_image_release_ibuf(ima, releaseibuf, lock);
				}

				continue;
			}

			float zoomx = (x2 - x1) / ibuf->x;
			float zoomy = (y2 - y1) / ibuf->y;

			/* For some reason; zoom-levels down refuses to use GL_ALPHA_SCALE. */
			if (zoomx < 1.0f || zoomy < 1.0f) {
				float tzoom = min_ff(zoomx, zoomy);
				int mip = 0;

				if ((ibuf->userflags & IB_MIPMAP_INVALID) != 0) {
					IMB_remakemipmap(ibuf, 0);
					ibuf->userflags &= ~IB_MIPMAP_INVALID;
				}
				else if (ibuf->mipmap[0] == NULL) {
					IMB_makemipmap(ibuf, 0);
				}

				while (tzoom < 1.0f && mip < 8 && ibuf->mipmap[mip]) {
					tzoom *= 2.0f;
					zoomx *= 2.0f;
					zoomy *= 2.0f;
					mip++;
				}
				if (mip > 0) {
					ibuf = ibuf->mipmap[mip - 1];
				}
			}

			GPU_depth_test(!do_foreground);
			glDepthMask(GL_FALSE);

			GPU_blend(true);
			GPU_blend_set_func_separate(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);

			GPU_matrix_push_projection();
			GPU_matrix_push();
			ED_region_pixelspace(ar);

			GPU_matrix_translate_2f(centx, centy);
			GPU_matrix_scale_1f(bgpic->scale);
			GPU_matrix_rotate_2d(RAD2DEGF(-bgpic->rotation));

			if (bgpic->flag & CAM_BGIMG_FLAG_FLIP_X) {
				zoomx *= -1.0f;
				x1 = x2;
			}
			if (bgpic->flag & CAM_BGIMG_FLAG_FLIP_Y) {
				zoomy *= -1.0f;
				y1 = y2;
			}

			float col[4] = {1.0f, 1.0f, 1.0f, bgpic->alpha};
			IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
			immDrawPixelsTex(&state, x1 - centx, y1 - centy, ibuf->x, ibuf->y, GL_RGBA, GL_UNSIGNED_BYTE, GL_LINEAR, ibuf->rect,
			                 zoomx, zoomy, col);

			GPU_matrix_pop_projection();
			GPU_matrix_pop();

			GPU_blend(false);

			glDepthMask(GL_TRUE);
			GPU_depth_test(true);

			if (freeibuf) {
				IMB_freeImBuf(freeibuf);
			}
			if (releaseibuf) {
				BKE_image_release_ibuf(ima, releaseibuf, lock);
			}
		}
	}
}

void ED_view3d_draw_bgpic_test(
        Scene *scene, Depsgraph *depsgraph,
        ARegion *ar, View3D *v3d,
        const bool do_foreground, const bool do_camera_frame)
{
	RegionView3D *rv3d = ar->regiondata;

	if ((rv3d->persp == RV3D_CAMOB) && v3d->camera && (v3d->camera->type == OB_CAMERA)) {
		Camera *cam = v3d->camera->data;
		if ((cam->flag & CAM_SHOW_BG_IMAGE) == 0) {
			return;
		}
	}
	else {
		return;
	}

	/* disabled - mango request, since footage /w only render is quite useful
	 * and this option is easy to disable all background images at once */
#if 0
	if (v3d->flag2 & V3D_HIDE_OVERLAYS) {
		return;
	}
#endif

	if ((rv3d->view == RV3D_VIEW_USER) || (rv3d->persp != RV3D_ORTHO)) {
		if (rv3d->persp == RV3D_CAMOB) {
			view3d_draw_bgpic(scene, depsgraph, ar, v3d, do_foreground, do_camera_frame);
		}
	}
	else {
		view3d_draw_bgpic(scene, depsgraph, ar, v3d, do_foreground, do_camera_frame);
	}
}

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

void view3d_update_depths_rect(ARegion *ar, ViewDepths *d, rcti *rect)
{
	/* clamp rect by region */
	rcti r = {
		.xmin = 0,
		.xmax = ar->winx - 1,
		.ymin = 0,
		.ymax = ar->winy - 1,
	};

	/* Constrain rect to depth bounds */
	BLI_rcti_isect(&r, rect, rect);

	/* assign values to compare with the ViewDepths */
	int x = rect->xmin;
	int y = rect->ymin;

	int w = BLI_rcti_size_x(rect);
	int h = BLI_rcti_size_y(rect);

	if (w <= 0 || h <= 0) {
		if (d->depths) {
			MEM_freeN(d->depths);
		}
		d->depths = NULL;

		d->damaged = false;
	}
	else if (d->w != w ||
	         d->h != h ||
	         d->x != x ||
	         d->y != y ||
	         d->depths == NULL
	         )
	{
		d->x = x;
		d->y = y;
		d->w = w;
		d->h = h;

		if (d->depths) {
			MEM_freeN(d->depths);
		}

		d->depths = MEM_mallocN(sizeof(float) * d->w * d->h, "View depths Subset");

		d->damaged = true;
	}

	if (d->damaged) {
		GPUViewport *viewport = WM_draw_region_get_viewport(ar, 0);
		view3d_opengl_read_Z_pixels(viewport, rect, d->depths);
		glGetDoublev(GL_DEPTH_RANGE, d->depth_range);
		d->damaged = false;
	}
}

/* note, with nouveau drivers the glReadPixels() is very slow. [#24339] */
void ED_view3d_depth_update(ARegion *ar)
{
	RegionView3D *rv3d = ar->regiondata;

	/* Create storage for, and, if necessary, copy depth buffer */
	if (!rv3d->depths) {
		rv3d->depths = MEM_callocN(sizeof(ViewDepths), "ViewDepths");
	}
	if (rv3d->depths) {
		ViewDepths *d = rv3d->depths;
		if (d->w != ar->winx ||
		    d->h != ar->winy ||
		    !d->depths)
		{
			d->w = ar->winx;
			d->h = ar->winy;
			if (d->depths) {
				MEM_freeN(d->depths);
			}
			d->depths = MEM_mallocN(sizeof(float) * d->w * d->h, "View depths");
			d->damaged = true;
		}

		if (d->damaged) {
			view3d_opengl_read_pixels(ar, 0, 0, d->w, d->h, GL_DEPTH_COMPONENT, GL_FLOAT, d->depths);
			glGetDoublev(GL_DEPTH_RANGE, d->depth_range);

			d->damaged = false;
		}
	}
}

/* utility function to find the closest Z value, use for autodepth */
float view3d_depth_near(ViewDepths *d)
{
	/* convert to float for comparisons */
	const float near = (float)d->depth_range[0];
	const float far_real = (float)d->depth_range[1];
	float far = far_real;

	const float *depths = d->depths;
	float depth = FLT_MAX;
	int i = (int)d->w * (int)d->h; /* cast to avoid short overflow */

	/* far is both the starting 'far' value
	 * and the closest value found. */
	while (i--) {
		depth = *depths++;
		if ((depth < far) && (depth > near)) {
			far = depth;
		}
	}

	return far == far_real ? FLT_MAX : far;
}

void ED_view3d_draw_depth_gpencil(
        Depsgraph *depsgraph, Scene *scene, ARegion *ar, View3D *v3d)
{
	/* Setup view matrix. */
	ED_view3d_draw_setup_view(NULL, depsgraph, scene, ar, v3d, NULL, NULL, NULL);

	GPU_clear(GPU_DEPTH_BIT);

	GPU_depth_test(true);

	GPUViewport *viewport = WM_draw_region_get_viewport(ar, 0);
	DRW_draw_depth_loop_gpencil(depsgraph, ar, v3d, viewport);

	GPU_depth_test(false);
}

/* *********************** customdata **************** */

void ED_view3d_datamask(
        const bContext *C, const Scene *UNUSED(scene), const View3D *v3d, CustomData_MeshMasks *r_cddata_masks)
{
	const int drawtype = view3d_effective_drawtype(v3d);

	if (ELEM(drawtype, OB_TEXTURE, OB_MATERIAL)) {
		r_cddata_masks->lmask |= CD_MASK_MLOOPUV | CD_MASK_MLOOPCOL;

		if (drawtype == OB_MATERIAL) {
			r_cddata_masks->vmask |= CD_MASK_ORCO;
		}
	}

	if ((CTX_data_mode_enum(C) == CTX_MODE_EDIT_MESH) &&
	    (v3d->overlay.edit_flag & V3D_OVERLAY_EDIT_WEIGHT))
	{
		r_cddata_masks->vmask |= CD_MASK_MDEFORMVERT;
	}
}

/* goes over all modes and view3d settings */
void ED_view3d_screen_datamask(
        const bContext *C, const Scene *scene, const bScreen *screen, CustomData_MeshMasks *r_cddata_masks)
{
	CustomData_MeshMasks_update(r_cddata_masks, &CD_MASK_BAREMESH);

	/* check if we need tfaces & mcols due to view mode */
	for (const ScrArea *sa = screen->areabase.first; sa; sa = sa->next) {
		if (sa->spacetype == SPACE_VIEW3D) {
			ED_view3d_datamask(C, scene, sa->spacedata.first, r_cddata_masks);
		}
	}
}

/**
 * Store values from #RegionView3D, set when drawing.
 * This is needed when we draw with to a viewport using a different matrix (offscreen drawing for example).
 *
 * Values set by #ED_view3d_update_viewmat should be handled here.
 */
struct RV3DMatrixStore {
	float winmat[4][4];
	float viewmat[4][4];
	float viewinv[4][4];
	float persmat[4][4];
	float persinv[4][4];
	float viewcamtexcofac[4];
	float pixsize;
};

struct RV3DMatrixStore *ED_view3d_mats_rv3d_backup(struct RegionView3D *rv3d)
{
	struct RV3DMatrixStore *rv3dmat = MEM_mallocN(sizeof(*rv3dmat), __func__);
	copy_m4_m4(rv3dmat->winmat, rv3d->winmat);
	copy_m4_m4(rv3dmat->viewmat, rv3d->viewmat);
	copy_m4_m4(rv3dmat->persmat, rv3d->persmat);
	copy_m4_m4(rv3dmat->persinv, rv3d->persinv);
	copy_m4_m4(rv3dmat->viewinv, rv3d->viewinv);
	copy_v4_v4(rv3dmat->viewcamtexcofac, rv3d->viewcamtexcofac);
	rv3dmat->pixsize = rv3d->pixsize;
	return (void *)rv3dmat;
}

void ED_view3d_mats_rv3d_restore(struct RegionView3D *rv3d, struct RV3DMatrixStore *rv3dmat_pt)
{
	struct RV3DMatrixStore *rv3dmat = rv3dmat_pt;
	copy_m4_m4(rv3d->winmat, rv3dmat->winmat);
	copy_m4_m4(rv3d->viewmat, rv3dmat->viewmat);
	copy_m4_m4(rv3d->persmat, rv3dmat->persmat);
	copy_m4_m4(rv3d->persinv, rv3dmat->persinv);
	copy_m4_m4(rv3d->viewinv, rv3dmat->viewinv);
	copy_v4_v4(rv3d->viewcamtexcofac, rv3dmat->viewcamtexcofac);
	rv3d->pixsize = rv3dmat->pixsize;
}

/**
 * \note The info that this uses is updated in #ED_refresh_viewport_fps,
 * which currently gets called during #SCREEN_OT_animation_step.
 */
void ED_scene_draw_fps(Scene *scene, int xoffset, int *yoffset)
{
	ScreenFrameRateInfo *fpsi = scene->fps_info;
	char printable[16];

	if (!fpsi || !fpsi->lredrawtime || !fpsi->redrawtime) {
		return;
	}

	printable[0] = '\0';

#if 0
	/* this is too simple, better do an average */
	fps = (float)(1.0 / (fpsi->lredrawtime - fpsi->redrawtime))
#else
	fpsi->redrawtimes_fps[fpsi->redrawtime_index] = (float)(1.0 / (fpsi->lredrawtime - fpsi->redrawtime));

	float fps = 0.0f;
	int tot = 0;
	for (int i = 0; i < REDRAW_FRAME_AVERAGE; i++) {
		if (fpsi->redrawtimes_fps[i]) {
			fps += fpsi->redrawtimes_fps[i];
			tot++;
		}
	}
	if (tot) {
		fpsi->redrawtime_index = (fpsi->redrawtime_index + 1) % REDRAW_FRAME_AVERAGE;

		//fpsi->redrawtime_index++;
		//if (fpsi->redrawtime >= REDRAW_FRAME_AVERAGE) {
		//	fpsi->redrawtime = 0;
		//}

		fps = fps / tot;
	}
#endif

	const int font_id = BLF_default();

	/* is this more than half a frame behind? */
	if (fps + 0.5f < (float)(FPS)) {
		UI_FontThemeColor(font_id, TH_REDALERT);
		BLI_snprintf(printable, sizeof(printable), IFACE_("fps: %.2f"), fps);
	}
	else {
		UI_FontThemeColor(font_id, TH_TEXT_HI);
		BLI_snprintf(printable, sizeof(printable), IFACE_("fps: %i"), (int)(fps + 0.5f));
	}

	BLF_enable(font_id, BLF_SHADOW);
	BLF_shadow(font_id, 5, (const float[4]){0.0f, 0.0f, 0.0f, 1.0f});
	BLF_shadow_offset(font_id, 1, -1);

	*yoffset -= U.widget_unit;

#ifdef WITH_INTERNATIONAL
	BLF_draw_default(xoffset, *yoffset, 0.0f, printable, sizeof(printable));
#else
	BLF_draw_default_ascii(xoffset, *yoffset, 0.0f, printable, sizeof(printable));
#endif

	BLF_disable(font_id, BLF_SHADOW);
}

static bool view3d_main_region_do_render_draw(const Scene *scene)
{
	RenderEngineType *type = RE_engines_find(scene->r.engine);
	return (type && type->view_update && type->view_draw);
}

bool ED_view3d_calc_render_border(const Scene *scene, Depsgraph *depsgraph, View3D *v3d, ARegion *ar, rcti *rect)
{
	RegionView3D *rv3d = ar->regiondata;
	bool use_border;

	/* test if there is a 3d view rendering */
	if (v3d->shading.type != OB_RENDER || !view3d_main_region_do_render_draw(scene)) {
		return false;
	}

	/* test if there is a border render */
	if (rv3d->persp == RV3D_CAMOB) {
		use_border = (scene->r.mode & R_BORDER) != 0;
	}
	else {
		use_border = (v3d->flag2 & V3D_RENDER_BORDER) != 0;
	}

	if (!use_border) {
		return false;
	}

	/* compute border */
	if (rv3d->persp == RV3D_CAMOB) {
		rctf viewborder;
		ED_view3d_calc_camera_border(scene, depsgraph, ar, v3d, rv3d, &viewborder, false);

		rect->xmin = viewborder.xmin + scene->r.border.xmin * BLI_rctf_size_x(&viewborder);
		rect->ymin = viewborder.ymin + scene->r.border.ymin * BLI_rctf_size_y(&viewborder);
		rect->xmax = viewborder.xmin + scene->r.border.xmax * BLI_rctf_size_x(&viewborder);
		rect->ymax = viewborder.ymin + scene->r.border.ymax * BLI_rctf_size_y(&viewborder);
	}
	else {
		rect->xmin = v3d->render_border.xmin * ar->winx;
		rect->xmax = v3d->render_border.xmax * ar->winx;
		rect->ymin = v3d->render_border.ymin * ar->winy;
		rect->ymax = v3d->render_border.ymax * ar->winy;
	}

	BLI_rcti_translate(rect, ar->winrct.xmin, ar->winrct.ymin);
	BLI_rcti_isect(&ar->winrct, rect, rect);

	return true;
}