Fix T86037 EEVEE: SSR option changes render passes result

This was caused by the SSR option resetting the accumulation. But the
render passes were only cleared in the init phase. This means that
when SSR was resetting the `taa_render_sample` the actual renderpasses
would still contains 1 sample. This means the renderpasses were always
divided by the wrong number of samples.

The fix is to clear just before accumulation if the sample is 1.

The fact that it works for motion blur is kind of a blessing. This is because
we check `stl->effects->ssr_was_valid_double_buffer` before resetting the
sampling. So this only happens on the first motion step and does not affect
the rest of the rendering.

Differential Revision: https://developer.blender.org/D11033

source/blender/draw/engines/eevee/eevee_materials.c

@@ -961,22 +961,9 @@ void EEVEE_material_renderpasses_init(EEVEE_Data *vedata)
   }
 }
 
-static void material_renderpass_init(EEVEE_FramebufferList *fbl,
+static void material_renderpass_init(GPUTexture **output_tx, const eGPUTextureFormat format)
-                                     GPUTexture **output_tx,
-                                     const eGPUTextureFormat format,
-                                     const bool do_clear)
 {
   DRW_texture_ensure_fullscreen_2d(output_tx, format, 0);
-  /* Clear texture. */
-  if (do_clear) {
-    const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
-    /* TODO(fclem): replace by GPU_texture_clear once it is fast. */
-    GPU_framebuffer_texture_attach(fbl->material_accum_fb, *output_tx, 0, 0);
-    GPU_framebuffer_bind(fbl->material_accum_fb);
-    GPU_framebuffer_clear_color(fbl->material_accum_fb, clear);
-    GPU_framebuffer_bind(fbl->main_fb);
-    GPU_framebuffer_texture_detach(fbl->material_accum_fb, *output_tx);
-  }
 }
 
 void EEVEE_material_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata, uint tot_samples)
@@ -991,33 +978,32 @@ void EEVEE_material_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
   /* Should be enough precision for many samples. */
   const eGPUTextureFormat texture_format = (tot_samples > 128) ? GPU_RGBA32F : GPU_RGBA16F;
 
-  const bool do_clear = (effects->taa_current_sample == 1);
   /* Create FrameBuffer. */
   GPU_framebuffer_ensure_config(&fbl->material_accum_fb,
                                 {GPU_ATTACHMENT_TEXTURE(dtxl->depth), GPU_ATTACHMENT_LEAVE});
 
   if (pd->render_passes & EEVEE_RENDER_PASS_ENVIRONMENT) {
-    material_renderpass_init(fbl, &txl->env_accum, texture_format, do_clear);
+    material_renderpass_init(&txl->env_accum, texture_format);
   }
   if (pd->render_passes & EEVEE_RENDER_PASS_EMIT) {
-    material_renderpass_init(fbl, &txl->emit_accum, texture_format, do_clear);
+    material_renderpass_init(&txl->emit_accum, texture_format);
   }
   if (pd->render_passes & EEVEE_RENDER_PASS_DIFFUSE_COLOR) {
-    material_renderpass_init(fbl, &txl->diff_color_accum, texture_format, do_clear);
+    material_renderpass_init(&txl->diff_color_accum, texture_format);
   }
   if (pd->render_passes & EEVEE_RENDER_PASS_DIFFUSE_LIGHT) {
-    material_renderpass_init(fbl, &txl->diff_light_accum, texture_format, do_clear);
+    material_renderpass_init(&txl->diff_light_accum, texture_format);
   }
   if (pd->render_passes & EEVEE_RENDER_PASS_SPECULAR_COLOR) {
-    material_renderpass_init(fbl, &txl->spec_color_accum, texture_format, do_clear);
+    material_renderpass_init(&txl->spec_color_accum, texture_format);
   }
   if (pd->render_passes & EEVEE_RENDER_PASS_AOV) {
     for (int aov_index = 0; aov_index < pd->num_aovs_used; aov_index++) {
-      material_renderpass_init(fbl, &txl->aov_surface_accum[aov_index], texture_format, do_clear);
+      material_renderpass_init(&txl->aov_surface_accum[aov_index], texture_format);
     }
   }
   if (pd->render_passes & EEVEE_RENDER_PASS_SPECULAR_LIGHT) {
-    material_renderpass_init(fbl, &txl->spec_light_accum, texture_format, do_clear);
+    material_renderpass_init(&txl->spec_light_accum, texture_format);
 
     if (effects->enabled_effects & EFFECT_SSR) {
       EEVEE_reflection_output_init(sldata, vedata, tot_samples);
@@ -1025,7 +1011,8 @@ void EEVEE_material_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
   }
 }
 
-static void material_renderpass_accumulate(EEVEE_FramebufferList *fbl,
+static void material_renderpass_accumulate(EEVEE_EffectsInfo *effects,
+                                           EEVEE_FramebufferList *fbl,
                                            DRWPass *renderpass,
                                            DRWPass *renderpass2,
                                            EEVEE_PrivateData *pd,
@@ -1035,6 +1022,11 @@ static void material_renderpass_accumulate(EEVEE_FramebufferList *fbl,
   GPU_framebuffer_texture_attach(fbl->material_accum_fb, output_tx, 0, 0);
   GPU_framebuffer_bind(fbl->material_accum_fb);
 
+  if (effects->taa_current_sample == 1) {
+    const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+    GPU_framebuffer_clear_color(fbl->material_accum_fb, clear);
+  }
+
   pd->renderpass_ubo = renderpass_option_ubo;
   DRW_draw_pass(renderpass);
   if (renderpass2) {
@@ -1056,15 +1048,21 @@ void EEVEE_material_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *v
     DRWPass *material_accum_ps = psl->material_accum_ps;
     DRWPass *background_accum_ps = psl->background_accum_ps;
     if (pd->render_passes & EEVEE_RENDER_PASS_ENVIRONMENT) {
-      material_renderpass_accumulate(
+      material_renderpass_accumulate(effects,
-          fbl, background_accum_ps, NULL, pd, txl->env_accum, sldata->renderpass_ubo.environment);
+                                     fbl,
+                                     background_accum_ps,
+                                     NULL,
+                                     pd,
+                                     txl->env_accum,
+                                     sldata->renderpass_ubo.environment);
     }
     if (pd->render_passes & EEVEE_RENDER_PASS_EMIT) {
       material_renderpass_accumulate(
-          fbl, material_accum_ps, NULL, pd, txl->emit_accum, sldata->renderpass_ubo.emit);
+          effects, fbl, material_accum_ps, NULL, pd, txl->emit_accum, sldata->renderpass_ubo.emit);
     }
     if (pd->render_passes & EEVEE_RENDER_PASS_DIFFUSE_COLOR) {
-      material_renderpass_accumulate(fbl,
+      material_renderpass_accumulate(effects,
+                                     fbl,
                                      material_accum_ps,
                                      NULL,
                                      pd,
@@ -1072,7 +1070,8 @@ void EEVEE_material_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *v
                                      sldata->renderpass_ubo.diff_color);
     }
     if (pd->render_passes & EEVEE_RENDER_PASS_DIFFUSE_LIGHT) {
-      material_renderpass_accumulate(fbl,
+      material_renderpass_accumulate(effects,
+                                     fbl,
                                      material_accum_ps,
                                      NULL,
                                      pd,
@@ -1090,7 +1089,8 @@ void EEVEE_material_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *v
         sldata->common_data.ssr_toggle = false;
         GPU_uniformbuf_update(sldata->common_ubo, &sldata->common_data);
       }
-      material_renderpass_accumulate(fbl,
+      material_renderpass_accumulate(effects,
+                                     fbl,
                                      material_accum_ps,
                                      NULL,
                                      pd,
@@ -1102,7 +1102,8 @@ void EEVEE_material_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *v
       }
     }
     if (pd->render_passes & EEVEE_RENDER_PASS_SPECULAR_LIGHT) {
-      material_renderpass_accumulate(fbl,
+      material_renderpass_accumulate(effects,
+                                     fbl,
                                      material_accum_ps,
                                      NULL,
                                      pd,
@@ -1115,7 +1116,8 @@ void EEVEE_material_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *v
     }
     if (pd->render_passes & EEVEE_RENDER_PASS_AOV) {
       for (int aov_index = 0; aov_index < pd->num_aovs_used; aov_index++) {
-        material_renderpass_accumulate(fbl,
+        material_renderpass_accumulate(effects,
+                                       fbl,
                                        material_accum_ps,
                                        background_accum_ps,
                                        pd,

source/blender/draw/engines/eevee/eevee_mist.c

@@ -40,12 +40,9 @@ void EEVEE_mist_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
   EEVEE_TextureList *txl = vedata->txl;
   EEVEE_StorageList *stl = vedata->stl;
   EEVEE_PassList *psl = vedata->psl;
-  EEVEE_EffectsInfo *effects = stl->effects;
   EEVEE_PrivateData *g_data = stl->g_data;
   Scene *scene = draw_ctx->scene;
 
-  const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
-
   /* Create FrameBuffer. */
   /* Should be enough precision for many samples. */
   DRW_texture_ensure_fullscreen_2d(&txl->mist_accum, GPU_R32F, 0);
@@ -53,12 +50,6 @@ void EEVEE_mist_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
   GPU_framebuffer_ensure_config(&fbl->mist_accum_fb,
                                 {GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(txl->mist_accum)});
 
-  /* Clear texture. */
-  if (effects->taa_current_sample == 1) {
-    GPU_framebuffer_bind(fbl->mist_accum_fb);
-    GPU_framebuffer_clear_color(fbl->mist_accum_fb, clear);
-  }
-
   /* Mist settings. */
   if (scene && scene->world) {
     g_data->mist_start = scene->world->miststa;
@@ -103,9 +94,17 @@ void EEVEE_mist_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Dat
 {
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_PassList *psl = vedata->psl;
+  EEVEE_EffectsInfo *effects = vedata->stl->effects;
 
   if (fbl->mist_accum_fb != NULL) {
     GPU_framebuffer_bind(fbl->mist_accum_fb);
+
+    /* Clear texture. */
+    if (effects->taa_current_sample == 1) {
+      const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+      GPU_framebuffer_clear_color(fbl->mist_accum_fb, clear);
+    }
+
     DRW_draw_pass(psl->mist_accum_ps);
 
     /* Restore */

source/blender/draw/engines/eevee/eevee_occlusion.c

@@ -120,7 +120,6 @@ void EEVEE_occlusion_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata
   const eGPUTextureFormat texture_format = (tot_samples > 128) ? GPU_R32F : GPU_R16F;
 
   DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
-  const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
 
   /* Should be enough precision for many samples. */
   DRW_texture_ensure_fullscreen_2d(&txl->ao_accum, texture_format, 0);
@@ -128,12 +127,6 @@ void EEVEE_occlusion_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata
   GPU_framebuffer_ensure_config(&fbl->ao_accum_fb,
                                 {GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(txl->ao_accum)});
 
-  /* Clear texture. */
-  if (effects->taa_current_sample == 1) {
-    GPU_framebuffer_bind(fbl->ao_accum_fb);
-    GPU_framebuffer_clear_color(fbl->ao_accum_fb, clear);
-  }
-
   /* Accumulation pass */
   DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ADD;
   DRW_PASS_CREATE(psl->ao_accum_ps, state);
@@ -246,6 +239,7 @@ void EEVEE_occlusion_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *
 {
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_PassList *psl = vedata->psl;
+  EEVEE_EffectsInfo *effects = vedata->stl->effects;
 
   if (fbl->ao_accum_fb != NULL) {
     DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
@@ -255,6 +249,13 @@ void EEVEE_occlusion_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *
     EEVEE_occlusion_compute(sldata, vedata);
 
     GPU_framebuffer_bind(fbl->ao_accum_fb);
+
+    /* Clear texture. */
+    if (effects->taa_current_sample == 1) {
+      const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+      GPU_framebuffer_clear_color(fbl->ao_accum_fb, clear);
+    }
+
     DRW_draw_pass(psl->ao_accum_ps);
 
     /* Restore */

source/blender/draw/engines/eevee/eevee_renderpasses.c

@@ -291,6 +291,8 @@ void EEVEE_renderpasses_postprocess(EEVEE_ViewLayerData *UNUSED(sldata),
   g_data->renderpass_transmittance_input = volumetric_active ? txl->volume_transmittance_accum :
                                                                txl->color;
 
+  printf("renderpass_current_sample %d\n", g_data->renderpass_current_sample);
+
   if (!volumetric_active && renderpass_type == EEVEE_RENDER_PASS_VOLUME_LIGHT) {
     /* Early exit: Volumetric effect is off, but the volume light pass was requested. */
     static float clear_col[4] = {0.0f};

source/blender/draw/engines/eevee/eevee_screen_raytrace.c

@@ -234,10 +234,6 @@ void EEVEE_reflection_output_init(EEVEE_ViewLayerData *UNUSED(sldata),
 {
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_TextureList *txl = vedata->txl;
-  EEVEE_StorageList *stl = vedata->stl;
-  EEVEE_EffectsInfo *effects = stl->effects;
-
-  const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
 
   /* Create FrameBuffer. */
   const eGPUTextureFormat texture_format = (tot_samples > 256) ? GPU_RGBA32F : GPU_RGBA16F;
@@ -245,12 +241,6 @@ void EEVEE_reflection_output_init(EEVEE_ViewLayerData *UNUSED(sldata),
 
   GPU_framebuffer_ensure_config(&fbl->ssr_accum_fb,
                                 {GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(txl->ssr_accum)});
-
-  /* Clear texture. */
-  if (effects->taa_current_sample == 1) {
-    GPU_framebuffer_bind(fbl->ssr_accum_fb);
-    GPU_framebuffer_clear_color(fbl->ssr_accum_fb, clear);
-  }
 }
 
 void EEVEE_reflection_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
@@ -258,9 +248,18 @@ void EEVEE_reflection_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EEV
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_PassList *psl = vedata->psl;
   EEVEE_StorageList *stl = vedata->stl;
+  EEVEE_EffectsInfo *effects = vedata->stl->effects;
 
   if (stl->g_data->valid_double_buffer) {
     GPU_framebuffer_bind(fbl->ssr_accum_fb);
+
+    /* Clear texture. */
+    if (effects->taa_current_sample == 1) {
+      const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+      printf("Clear\n");
+      GPU_framebuffer_clear_color(fbl->ssr_accum_fb, clear);
+    }
+
     DRW_draw_pass(psl->ssr_resolve);
   }
 }

source/blender/draw/engines/eevee/eevee_shadows.c

@@ -361,12 +361,8 @@ void EEVEE_shadow_output_init(EEVEE_ViewLayerData *sldata,
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_TextureList *txl = vedata->txl;
   EEVEE_PassList *psl = vedata->psl;
-  EEVEE_StorageList *stl = vedata->stl;
-  EEVEE_EffectsInfo *effects = stl->effects;
   DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
 
-  const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
-
   /* Create FrameBuffer. */
   const eGPUTextureFormat texture_format = GPU_R32F;
   DRW_texture_ensure_fullscreen_2d(&txl->shadow_accum, texture_format, 0);
@@ -374,12 +370,6 @@ void EEVEE_shadow_output_init(EEVEE_ViewLayerData *sldata,
   GPU_framebuffer_ensure_config(&fbl->shadow_accum_fb,
                                 {GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(txl->shadow_accum)});
 
-  /* Clear texture. */
-  if (effects->taa_current_sample == 1) {
-    GPU_framebuffer_bind(fbl->shadow_accum_fb);
-    GPU_framebuffer_clear_color(fbl->shadow_accum_fb, clear);
-  }
-
   /* Create Pass and shgroup. */
   DRW_PASS_CREATE(psl->shadow_accum_pass,
                   DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_ALWAYS | DRW_STATE_BLEND_ADD_FULL);
@@ -404,9 +394,17 @@ void EEVEE_shadow_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_D
 {
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_PassList *psl = vedata->psl;
+  EEVEE_EffectsInfo *effects = vedata->stl->effects;
 
   if (fbl->shadow_accum_fb != NULL) {
     GPU_framebuffer_bind(fbl->shadow_accum_fb);
+
+    /* Clear texture. */
+    if (effects->taa_current_sample == 1) {
+      const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+      GPU_framebuffer_clear_color(fbl->shadow_accum_fb, clear);
+    }
+
     DRW_draw_pass(psl->shadow_accum_pass);
 
     /* Restore */

source/blender/draw/engines/eevee/eevee_volumes.c

@@ -394,10 +394,9 @@ static bool eevee_volume_object_grids_init(Object *ob, ListBase *gpu_grids, DRWS
      * - Grid exists and texture was loaded -> use texture.
      * - Grid exists but has zero size or failed to load -> use zero.
      * - Grid does not exist -> use default value. */
-    GPUTexture *grid_tex = (drw_grid) ? drw_grid->texture :
+    GPUTexture *grid_tex = (drw_grid)    ? drw_grid->texture :
-                                        (volume_grid) ?
+                           (volume_grid) ? e_data.dummy_zero :
-                                        e_data.dummy_zero :
+                                           eevee_volume_default_texture(gpu_grid->default_value);
-                                        eevee_volume_default_texture(gpu_grid->default_value);
 
     DRW_shgroup_uniform_texture(grp, gpu_grid->sampler_name, grid_tex);
 
@@ -800,8 +799,6 @@ void EEVEE_volumes_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
   EEVEE_PassList *psl = vedata->psl;
   EEVEE_EffectsInfo *effects = stl->effects;
 
-  const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
-
   /* Create FrameBuffer. */
 
   /* Should be enough precision for many samples. */
@@ -814,12 +811,6 @@ void EEVEE_volumes_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
                                  GPU_ATTACHMENT_TEXTURE(txl->volume_scatter_accum),
                                  GPU_ATTACHMENT_TEXTURE(txl->volume_transmittance_accum)});
 
-  /* Clear texture. */
-  if (effects->taa_current_sample == 1) {
-    GPU_framebuffer_bind(fbl->volumetric_accum_fb);
-    GPU_framebuffer_clear_color(fbl->volumetric_accum_fb, clear);
-  }
-
   /* Create Pass and shgroup. */
   DRW_PASS_CREATE(psl->volumetric_accum_ps, DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ADD_FULL);
   DRWShadingGroup *grp = NULL;
@@ -843,10 +834,18 @@ void EEVEE_volumes_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_
 {
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_PassList *psl = vedata->psl;
+  EEVEE_EffectsInfo *effects = vedata->stl->effects;
 
   if (fbl->volumetric_accum_fb != NULL) {
     /* Accum pass */
     GPU_framebuffer_bind(fbl->volumetric_accum_fb);
+
+    /* Clear texture. */
+    if (effects->taa_current_sample == 1) {
+      const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+      GPU_framebuffer_clear_color(fbl->volumetric_accum_fb, clear);
+    }
+
     DRW_draw_pass(psl->volumetric_accum_ps);
 
     /* Restore */