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-rw-r--r--source/blender/draw/engines/eevee/eevee_cryptomatte.c10
-rw-r--r--source/blender/draw/engines/eevee/eevee_effects.c24
-rw-r--r--source/blender/draw/engines/eevee/eevee_engine.c2
-rw-r--r--source/blender/draw/engines/eevee/eevee_private.h1
-rw-r--r--source/blender/draw/engines/eevee/shaders/ambient_occlusion_lib.glsl2
-rw-r--r--source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl13
-rw-r--r--source/blender/draw/engines/eevee/shaders/effect_minmaxz_frag.glsl19
-rw-r--r--source/blender/draw/engines/external/external_engine.c202
-rw-r--r--source/blender/draw/engines/external/external_engine.h8
-rw-r--r--source/blender/draw/engines/select/select_engine.c2
-rw-r--r--source/blender/draw/engines/workbench/workbench_engine.c2
11 files changed, 251 insertions, 34 deletions
diff --git a/source/blender/draw/engines/eevee/eevee_cryptomatte.c b/source/blender/draw/engines/eevee/eevee_cryptomatte.c
index 76a1b561972..49780abc6f4 100644
--- a/source/blender/draw/engines/eevee/eevee_cryptomatte.c
+++ b/source/blender/draw/engines/eevee/eevee_cryptomatte.c
@@ -139,8 +139,6 @@ void EEVEE_cryptomatte_renderpasses_init(EEVEE_Data *vedata)
g_data->cryptomatte_session = session;
g_data->render_passes |= EEVEE_RENDER_PASS_CRYPTOMATTE | EEVEE_RENDER_PASS_VOLUME_LIGHT;
- g_data->cryptomatte_accurate_mode = (view_layer->cryptomatte_flag &
- VIEW_LAYER_CRYPTOMATTE_ACCURATE) != 0;
}
}
@@ -405,7 +403,6 @@ void EEVEE_cryptomatte_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EE
{
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_StorageList *stl = vedata->stl;
- EEVEE_PrivateData *g_data = stl->g_data;
EEVEE_EffectsInfo *effects = stl->effects;
EEVEE_PassList *psl = vedata->psl;
const DRWContextState *draw_ctx = DRW_context_state_get();
@@ -413,10 +410,9 @@ void EEVEE_cryptomatte_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EE
const int cryptomatte_levels = view_layer->cryptomatte_levels;
const int current_sample = effects->taa_current_sample;
- /* In accurate mode all render samples are evaluated. In inaccurate mode this is limited to the
- * number of cryptomatte levels. This will reduce the overhead of downloading the GPU buffer and
- * integrating it into the accum buffer. */
- if (g_data->cryptomatte_accurate_mode || current_sample < cryptomatte_levels) {
+ /* Render samples used by cryptomatte are limited to the number of cryptomatte levels. This will
+ * reduce the overhead of downloading the GPU buffer and integrating it into the accum buffer. */
+ if (current_sample < cryptomatte_levels) {
static float clear_color[4] = {0.0};
GPU_framebuffer_bind(fbl->cryptomatte_fb);
GPU_framebuffer_clear_color(fbl->cryptomatte_fb, clear_color);
diff --git a/source/blender/draw/engines/eevee/eevee_effects.c b/source/blender/draw/engines/eevee/eevee_effects.c
index 3a38edecec6..d5960ea57d5 100644
--- a/source/blender/draw/engines/eevee/eevee_effects.c
+++ b/source/blender/draw/engines/eevee/eevee_effects.c
@@ -38,7 +38,8 @@ static struct {
struct GPUTexture *color_src;
int depth_src_layer;
- float cube_texel_size;
+ /* Size can be vec3. But we only use 2 components in the shader. */
+ float texel_size[2];
} e_data = {NULL}; /* Engine data */
#define SETUP_BUFFER(tex, fb, fb_color) \
@@ -259,6 +260,7 @@ void EEVEE_effects_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
DRW_PASS_CREATE(psl->color_downsample_ps, DRW_STATE_WRITE_COLOR);
grp = DRW_shgroup_create(EEVEE_shaders_effect_downsample_sh_get(), psl->color_downsample_ps);
DRW_shgroup_uniform_texture_ex(grp, "source", txl->filtered_radiance, GPU_SAMPLER_FILTER);
+ DRW_shgroup_uniform_vec2(grp, "texelSize", e_data.texel_size, 1);
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
}
@@ -267,7 +269,7 @@ void EEVEE_effects_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
grp = DRW_shgroup_create(EEVEE_shaders_effect_downsample_cube_sh_get(),
psl->color_downsample_cube_ps);
DRW_shgroup_uniform_texture_ref(grp, "source", &e_data.color_src);
- DRW_shgroup_uniform_float(grp, "texelSize", &e_data.cube_texel_size, 1);
+ DRW_shgroup_uniform_float(grp, "texelSize", e_data.texel_size, 1);
DRW_shgroup_uniform_int_copy(grp, "Layer", 0);
DRW_shgroup_call_instances(grp, NULL, quad, 6);
}
@@ -277,6 +279,7 @@ void EEVEE_effects_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
DRW_PASS_CREATE(psl->maxz_downlevel_ps, downsample_write);
grp = DRW_shgroup_create(EEVEE_shaders_effect_maxz_downlevel_sh_get(), psl->maxz_downlevel_ps);
DRW_shgroup_uniform_texture_ref_ex(grp, "depthBuffer", &txl->maxzbuffer, GPU_SAMPLER_DEFAULT);
+ DRW_shgroup_uniform_vec2(grp, "texelSize", e_data.texel_size, 1);
DRW_shgroup_call(grp, quad, NULL);
/* Copy depth buffer to top level of HiZ */
@@ -345,16 +348,22 @@ static void min_downsample_cb(void *vedata, int UNUSED(level))
}
#endif
-static void max_downsample_cb(void *vedata, int UNUSED(level))
+static void max_downsample_cb(void *vedata, int level)
{
EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
+ EEVEE_TextureList *txl = ((EEVEE_Data *)vedata)->txl;
+ int texture_size[3];
+ GPU_texture_get_mipmap_size(txl->maxzbuffer, level - 1, texture_size);
+ e_data.texel_size[0] = 1.0f / texture_size[0];
+ e_data.texel_size[1] = 1.0f / texture_size[1];
DRW_draw_pass(psl->maxz_downlevel_ps);
}
static void simple_downsample_cube_cb(void *vedata, int level)
{
EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
- e_data.cube_texel_size = (float)(1 << level) / (float)GPU_texture_width(e_data.color_src);
+ e_data.texel_size[0] = (float)(1 << level) / (float)GPU_texture_width(e_data.color_src);
+ e_data.texel_size[1] = e_data.texel_size[0];
DRW_draw_pass(psl->color_downsample_cube_ps);
}
@@ -390,9 +399,14 @@ void EEVEE_create_minmax_buffer(EEVEE_Data *vedata, GPUTexture *depth_src, int l
}
}
-static void downsample_radiance_cb(void *vedata, int UNUSED(level))
+static void downsample_radiance_cb(void *vedata, int level)
{
EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
+ EEVEE_TextureList *txl = ((EEVEE_Data *)vedata)->txl;
+ int texture_size[3];
+ GPU_texture_get_mipmap_size(txl->filtered_radiance, level - 1, texture_size);
+ e_data.texel_size[0] = 1.0f / texture_size[0];
+ e_data.texel_size[1] = 1.0f / texture_size[1];
DRW_draw_pass(psl->color_downsample_ps);
}
diff --git a/source/blender/draw/engines/eevee/eevee_engine.c b/source/blender/draw/engines/eevee/eevee_engine.c
index 6a66e8b1a58..f8e1cc9c923 100644
--- a/source/blender/draw/engines/eevee/eevee_engine.c
+++ b/source/blender/draw/engines/eevee/eevee_engine.c
@@ -648,6 +648,8 @@ RenderEngineType DRW_engine_viewport_eevee_type = {
NULL,
NULL,
NULL,
+ NULL,
+ NULL,
&EEVEE_render_update_passes,
&draw_engine_eevee_type,
{NULL, NULL, NULL},
diff --git a/source/blender/draw/engines/eevee/eevee_private.h b/source/blender/draw/engines/eevee/eevee_private.h
index f51b4fa0127..eae5d161cc3 100644
--- a/source/blender/draw/engines/eevee/eevee_private.h
+++ b/source/blender/draw/engines/eevee/eevee_private.h
@@ -1042,7 +1042,6 @@ typedef struct EEVEE_PrivateData {
int aov_hash;
int num_aovs_used;
struct CryptomatteSession *cryptomatte_session;
- bool cryptomatte_accurate_mode;
EEVEE_CryptomatteSample *cryptomatte_accum_buffer;
float *cryptomatte_download_buffer;
diff --git a/source/blender/draw/engines/eevee/shaders/ambient_occlusion_lib.glsl b/source/blender/draw/engines/eevee/shaders/ambient_occlusion_lib.glsl
index d4e3b879426..93641443cac 100644
--- a/source/blender/draw/engines/eevee/shaders/ambient_occlusion_lib.glsl
+++ b/source/blender/draw/engines/eevee/shaders/ambient_occlusion_lib.glsl
@@ -379,7 +379,7 @@ float specular_occlusion(
/* Visibility to cone angle (eq. 18). */
float vis_angle = fast_acos(sqrt(1 - visibility));
/* Roughness to cone angle (eq. 26). */
- float spec_angle = max(0.001, fast_acos(cone_cosine(roughness)));
+ float spec_angle = max(0.00990998744964599609375, fast_acos(cone_cosine(roughness)));
/* Angle between cone axes. */
float cone_cone_dist = fast_acos(saturate(dot(visibility_dir, specular_dir)));
float cone_nor_dist = fast_acos(saturate(dot(N, specular_dir)));
diff --git a/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl b/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
index d1cb25af82f..9fc258da185 100644
--- a/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
@@ -9,14 +9,16 @@
uniform sampler2D source;
uniform float fireflyFactor;
+#ifndef COPY_SRC
+uniform vec2 texelSize;
+#endif
+
out vec4 FragColor;
void main()
{
- vec2 texel_size = 1.0 / vec2(textureSize(source, 0));
- vec2 uvs = gl_FragCoord.xy * texel_size;
-
#ifdef COPY_SRC
+ vec2 uvs = gl_FragCoord.xy / vec2(textureSize(source, 0));
FragColor = textureLod(source, uvs, 0.0);
FragColor = safe_color(FragColor);
@@ -25,7 +27,10 @@ void main()
FragColor *= 1.0 - max(0.0, luma - fireflyFactor) / luma;
#else
- vec4 ofs = texel_size.xyxy * vec4(0.75, 0.75, -0.75, -0.75);
+ /* NOTE(@fclem): textureSize() does not work the same on all implementations
+ * when changing the min and max texture levels. Use uniform instead (see T87801). */
+ vec2 uvs = gl_FragCoord.xy * texelSize;
+ vec4 ofs = texelSize.xyxy * vec4(0.75, 0.75, -0.75, -0.75);
uvs *= 2.0;
FragColor = textureLod(source, uvs + ofs.xy, 0.0);
diff --git a/source/blender/draw/engines/eevee/shaders/effect_minmaxz_frag.glsl b/source/blender/draw/engines/eevee/shaders/effect_minmaxz_frag.glsl
index ccb65d2e5a6..8ef39a55921 100644
--- a/source/blender/draw/engines/eevee/shaders/effect_minmaxz_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/effect_minmaxz_frag.glsl
@@ -14,6 +14,10 @@ uniform int depthLayer;
uniform sampler2D depthBuffer;
#endif
+#ifndef COPY_DEPTH
+uniform vec2 texelSize;
+#endif
+
#ifdef LAYERED
# define sampleLowerMip(t) texture(depthBuffer, vec3(t, depthLayer)).r
# define gatherLowerMip(t) textureGather(depthBuffer, vec3(t, depthLayer))
@@ -41,23 +45,24 @@ out vec4 fragColor;
void main()
{
vec2 texel = gl_FragCoord.xy;
- vec2 texel_size = 1.0 / vec2(textureSize(depthBuffer, 0).xy);
#ifdef COPY_DEPTH
- vec2 uv = texel * texel_size;
+ vec2 uv = texel / vec2(textureSize(depthBuffer, 0).xy);
float val = sampleLowerMip(uv);
#else
- vec2 uv = texel * 2.0 * texel_size;
+ /* NOTE(@fclem): textureSize() does not work the same on all implementations
+ * when changing the min and max texture levels. Use uniform instead (see T87801). */
+ vec2 uv = texel * 2.0 * texelSize;
vec4 samp;
# ifdef GPU_ARB_texture_gather
samp = gatherLowerMip(uv);
# else
- samp.x = sampleLowerMip(uv + vec2(-0.5, -0.5) * texel_size);
- samp.y = sampleLowerMip(uv + vec2(-0.5, 0.5) * texel_size);
- samp.z = sampleLowerMip(uv + vec2(0.5, -0.5) * texel_size);
- samp.w = sampleLowerMip(uv + vec2(0.5, 0.5) * texel_size);
+ samp.x = sampleLowerMip(uv + vec2(-0.5, -0.5) * texelSize);
+ samp.y = sampleLowerMip(uv + vec2(-0.5, 0.5) * texelSize);
+ samp.z = sampleLowerMip(uv + vec2(0.5, -0.5) * texelSize);
+ samp.w = sampleLowerMip(uv + vec2(0.5, 0.5) * texelSize);
# endif
float val = minmax4(samp.x, samp.y, samp.z, samp.w);
diff --git a/source/blender/draw/engines/external/external_engine.c b/source/blender/draw/engines/external/external_engine.c
index 89ee3f1b293..cc548a53a8e 100644
--- a/source/blender/draw/engines/external/external_engine.c
+++ b/source/blender/draw/engines/external/external_engine.c
@@ -32,13 +32,19 @@
#include "BKE_object.h"
#include "BKE_particle.h"
+#include "ED_image.h"
#include "ED_screen.h"
+#include "GPU_batch.h"
+#include "GPU_debug.h"
#include "GPU_matrix.h"
#include "GPU_shader.h"
#include "GPU_state.h"
#include "GPU_viewport.h"
+#include "RE_engine.h"
+#include "RE_pipeline.h"
+
#include "external_engine.h" /* own include */
/* Shaders */
@@ -137,6 +143,22 @@ static void external_engine_init(void *vedata)
}
}
+/* Add shading group call which will take care of writing to the depth buffer, so that the
+ * alpha-under overlay will happen for the render buffer. */
+static void external_cache_image_add(DRWShadingGroup *grp)
+{
+ float obmat[4][4];
+ unit_m4(obmat);
+ scale_m4_fl(obmat, 0.5f);
+
+ /* NOTE: Use the same Z-depth value as in the regular image drawing engine. */
+ translate_m4(obmat, 1.0f, 1.0f, 0.75f);
+
+ GPUBatch *geom = DRW_cache_quad_get();
+
+ DRW_shgroup_call_obmat(grp, geom, obmat);
+}
+
static void external_cache_init(void *vedata)
{
EXTERNAL_PassList *psl = ((EXTERNAL_Data *)vedata)->psl;
@@ -162,14 +184,33 @@ static void external_cache_init(void *vedata)
stl->g_data->depth_shgrp = DRW_shgroup_create(e_data.depth_sh, psl->depth_pass);
}
- /* Do not draw depth pass when overlays are turned off. */
- stl->g_data->need_depth = (v3d->flag2 & V3D_HIDE_OVERLAYS) == 0;
+ if (v3d != NULL) {
+ /* Do not draw depth pass when overlays are turned off. */
+ stl->g_data->need_depth = (v3d->flag2 & V3D_HIDE_OVERLAYS) == 0;
+ }
+ else if (draw_ctx->space_data != NULL) {
+ const eSpace_Type space_type = draw_ctx->space_data->spacetype;
+ if (space_type == SPACE_IMAGE) {
+ external_cache_image_add(stl->g_data->depth_shgrp);
+
+ stl->g_data->need_depth = true;
+ stl->g_data->update_depth = true;
+ }
+ }
}
static void external_cache_populate(void *vedata, Object *ob)
{
+ const DRWContextState *draw_ctx = DRW_context_state_get();
EXTERNAL_StorageList *stl = ((EXTERNAL_Data *)vedata)->stl;
+ if (draw_ctx->space_data != NULL) {
+ const eSpace_Type space_type = draw_ctx->space_data->spacetype;
+ if (space_type == SPACE_IMAGE) {
+ return;
+ }
+ }
+
if (!(DRW_object_is_renderable(ob) &&
DRW_object_visibility_in_active_context(ob) & OB_VISIBLE_SELF)) {
return;
@@ -210,13 +251,11 @@ static void external_cache_finish(void *UNUSED(vedata))
{
}
-static void external_draw_scene_do(void *vedata)
+static void external_draw_scene_do_v3d(void *vedata)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
- Scene *scene = draw_ctx->scene;
RegionView3D *rv3d = draw_ctx->rv3d;
ARegion *region = draw_ctx->region;
- const RenderEngineType *type;
DRW_state_reset_ex(DRW_STATE_DEFAULT & ~DRW_STATE_DEPTH_LESS_EQUAL);
@@ -229,8 +268,6 @@ static void external_draw_scene_do(void *vedata)
}
RenderEngine *engine = RE_engine_create(engine_type);
- engine->tile_x = scene->r.tilex;
- engine->tile_y = scene->r.tiley;
engine_type->view_update(engine, draw_ctx->evil_C, draw_ctx->depsgraph);
rv3d->render_engine = engine;
}
@@ -241,7 +278,7 @@ static void external_draw_scene_do(void *vedata)
ED_region_pixelspace(region);
/* Render result draw. */
- type = rv3d->render_engine->type;
+ const RenderEngineType *type = rv3d->render_engine->type;
type->view_draw(rv3d->render_engine, draw_ctx->evil_C, draw_ctx->depsgraph);
GPU_bgl_end();
@@ -259,6 +296,116 @@ static void external_draw_scene_do(void *vedata)
}
}
+/* Configure current matrix stack so that the external engine can use the same drawing code for
+ * both viewport and image editor drawing.
+ *
+ * The engine draws result in the pixel space, and is applying render offset. For image editor we
+ * need to switch from normalized space to pixel space, and "un-apply" offset. */
+static void external_image_space_matrix_set(const RenderEngine *engine)
+{
+ BLI_assert(engine != NULL);
+
+ const DRWContextState *draw_ctx = DRW_context_state_get();
+ const DRWView *view = DRW_view_get_active();
+ struct SpaceImage *space_image = (struct SpaceImage *)draw_ctx->space_data;
+
+ /* Apply current view as transformation matrix.
+ * This will configure drawing for normalized space with current zoom and pan applied. */
+
+ float view_matrix[4][4];
+ DRW_view_viewmat_get(view, view_matrix, false);
+
+ float projection_matrix[4][4];
+ DRW_view_winmat_get(view, projection_matrix, false);
+
+ GPU_matrix_projection_set(projection_matrix);
+ GPU_matrix_set(view_matrix);
+
+ /* Switch from normalized space to pixel space. */
+ {
+ int width, height;
+ ED_space_image_get_size(space_image, &width, &height);
+
+ const float width_inv = width ? 1.0f / width : 0.0f;
+ const float height_inv = height ? 1.0f / height : 0.0f;
+ GPU_matrix_scale_2f(width_inv, height_inv);
+ }
+
+ /* Un-apply render offset. */
+ {
+ Render *render = engine->re;
+ rctf view_rect;
+ rcti render_rect;
+ RE_GetViewPlane(render, &view_rect, &render_rect);
+
+ GPU_matrix_translate_2f(-render_rect.xmin, -render_rect.ymin);
+ }
+}
+
+static void external_draw_scene_do_image(void *UNUSED(vedata))
+{
+ const DRWContextState *draw_ctx = DRW_context_state_get();
+ Scene *scene = draw_ctx->scene;
+ Render *re = RE_GetSceneRender(scene);
+ RenderEngine *engine = RE_engine_get(re);
+
+ /* Is tested before enabling the drawing engine. */
+ BLI_assert(re != NULL);
+ BLI_assert(engine != NULL);
+
+ const DefaultFramebufferList *dfbl = DRW_viewport_framebuffer_list_get();
+
+ /* Clear the depth buffer to the value used by the background overlay so that the overlay is not
+ * happening outside of the drawn image.
+ *
+ * NOTE: The external engine only draws color. The depth is taken care of using the depth pass
+ * which initialized the depth to the values expected by the background overlay. */
+ GPU_framebuffer_clear_depth(dfbl->default_fb, 1.0f);
+
+ GPU_matrix_push_projection();
+ GPU_matrix_push();
+
+ external_image_space_matrix_set(engine);
+
+ GPU_debug_group_begin("External Engine");
+
+ const RenderEngineType *engine_type = engine->type;
+ BLI_assert(engine_type != NULL);
+ BLI_assert(engine_type->draw != NULL);
+
+ engine_type->draw(engine, draw_ctx->evil_C, draw_ctx->depsgraph);
+
+ GPU_debug_group_end();
+
+ GPU_matrix_pop();
+ GPU_matrix_pop_projection();
+
+ DRW_state_reset();
+ GPU_bgl_end();
+
+ RE_engine_draw_release(re);
+}
+
+static void external_draw_scene_do(void *vedata)
+{
+ const DRWContextState *draw_ctx = DRW_context_state_get();
+
+ if (draw_ctx->v3d != NULL) {
+ external_draw_scene_do_v3d(vedata);
+ return;
+ }
+
+ if (draw_ctx->space_data == NULL) {
+ return;
+ }
+
+ const eSpace_Type space_type = draw_ctx->space_data->spacetype;
+ if (space_type == SPACE_IMAGE) {
+ external_draw_scene_do_image(vedata);
+ return;
+ }
+}
+
static void external_draw_scene(void *vedata)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
@@ -297,7 +444,7 @@ static void external_engine_free(void)
static const DrawEngineDataSize external_data_size = DRW_VIEWPORT_DATA_SIZE(EXTERNAL_Data);
-static DrawEngineType draw_engine_external_type = {
+DrawEngineType draw_engine_external_type = {
NULL,
NULL,
N_("External"),
@@ -330,8 +477,45 @@ RenderEngineType DRW_engine_viewport_external_type = {
NULL,
NULL,
NULL,
+ NULL,
+ NULL,
&draw_engine_external_type,
{NULL, NULL, NULL},
};
+bool DRW_engine_external_acquire_for_image_editor(void)
+{
+ const DRWContextState *draw_ctx = DRW_context_state_get();
+ const SpaceLink *space_data = draw_ctx->space_data;
+ Scene *scene = draw_ctx->scene;
+
+ if (space_data == NULL) {
+ return false;
+ }
+
+ const eSpace_Type space_type = draw_ctx->space_data->spacetype;
+ if (space_type != SPACE_IMAGE) {
+ return false;
+ }
+
+ struct SpaceImage *space_image = (struct SpaceImage *)space_data;
+ const Image *image = ED_space_image(space_image);
+ if (image == NULL || image->type != IMA_TYPE_R_RESULT) {
+ return false;
+ }
+
+ if (image->render_slot != image->last_render_slot) {
+ return false;
+ }
+
+ /* Render is allocated on main thread, so it is safe to access it from here. */
+ Render *re = RE_GetSceneRender(scene);
+
+ if (re == NULL) {
+ return false;
+ }
+
+ return RE_engine_draw_acquire(re);
+}
+
#undef EXTERNAL_ENGINE
diff --git a/source/blender/draw/engines/external/external_engine.h b/source/blender/draw/engines/external/external_engine.h
index c645fb99e0e..14ec4e2d3c5 100644
--- a/source/blender/draw/engines/external/external_engine.h
+++ b/source/blender/draw/engines/external/external_engine.h
@@ -22,4 +22,12 @@
#pragma once
+extern DrawEngineType draw_engine_external_type;
extern RenderEngineType DRW_engine_viewport_external_type;
+
+/* Check whether an external engine is to be used to draw content of an image editor.
+ * If the drawing is possible, the render engine is "acquired" so that it is not freed by the
+ * render engine for until drawing is finished.
+ *
+ * NOTE: Released by the draw engine when it is done drawing. */
+bool DRW_engine_external_acquire_for_image_editor(void);
diff --git a/source/blender/draw/engines/select/select_engine.c b/source/blender/draw/engines/select/select_engine.c
index 96ab8a28e09..20edd78597b 100644
--- a/source/blender/draw/engines/select/select_engine.c
+++ b/source/blender/draw/engines/select/select_engine.c
@@ -388,6 +388,8 @@ RenderEngineType DRW_engine_viewport_select_type = {
NULL,
NULL,
NULL,
+ NULL,
+ NULL,
&draw_engine_select_type,
{NULL, NULL, NULL},
};
diff --git a/source/blender/draw/engines/workbench/workbench_engine.c b/source/blender/draw/engines/workbench/workbench_engine.c
index f09c019ef8d..635aa7cef25 100644
--- a/source/blender/draw/engines/workbench/workbench_engine.c
+++ b/source/blender/draw/engines/workbench/workbench_engine.c
@@ -651,6 +651,8 @@ RenderEngineType DRW_engine_viewport_workbench_type = {
NULL,
NULL,
NULL,
+ NULL,
+ NULL,
&workbench_render_update_passes,
&draw_engine_workbench,
{NULL, NULL, NULL},