Fix T64913 Eevee: shader compilation does not reset TAA

This tracks the number of compiling shaders and just reset the TAA
if previous number mismatch.

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

@@ -60,6 +60,7 @@ static void eevee_engine_init(void *ved)
   stl->g_data->background_alpha = DRW_state_draw_background() ? 1.0f : 0.0f;
   stl->g_data->valid_double_buffer = (txl->color_double_buffer != NULL);
   stl->g_data->valid_taa_history = (txl->taa_history != NULL);
+  stl->g_data->queued_shaders_count = 0;
 
   /* Main Buffer */
   DRW_texture_ensure_fullscreen_2d(&txl->color, GPU_RGBA16F, DRW_TEX_FILTER | DRW_TEX_MIPMAP);
@@ -145,6 +146,7 @@ void EEVEE_cache_populate(void *vedata, Object *ob)
 static void eevee_cache_finish(void *vedata)
 {
   EEVEE_ViewLayerData *sldata = EEVEE_view_layer_data_ensure();
+  EEVEE_PrivateData *g_data = ((EEVEE_Data *)vedata)->stl->g_data;
 
   EEVEE_volumes_cache_finish(sldata, vedata);
   EEVEE_materials_cache_finish(sldata, vedata);
@@ -153,6 +155,13 @@ static void eevee_cache_finish(void *vedata)
 
   EEVEE_effects_draw_init(sldata, vedata);
   EEVEE_volumes_draw_init(sldata, vedata);
+
+  /* Restart taa if a shader has finish compiling. */
+  /* HACK We should use notification of some sort from the compilation job instead. */
+  if (g_data->queued_shaders_count != g_data->queued_shaders_count_prev) {
+    g_data->queued_shaders_count_prev = g_data->queued_shaders_count;
+    EEVEE_temporal_sampling_reset(vedata);
+  }
 }
 
 /* As renders in an HDR offscreen buffer, we need draw everything once

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

@@ -344,6 +344,7 @@ void EEVEE_lightprobes_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedat
 
       if (wo->use_nodes && wo->nodetree) {
         static float error_col[3] = {1.0f, 0.0f, 1.0f};
+        static float queue_col[3] = {0.5f, 0.5f, 0.5f};
         struct GPUMaterial *gpumat = EEVEE_material_world_lightprobe_get(scene, wo);
 
         eGPUMaterialStatus status = GPU_material_status(gpumat);
@@ -361,6 +362,10 @@ void EEVEE_lightprobes_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedat
             DRW_shgroup_uniform_block(grp, "shadow_block", sldata->shadow_ubo);
             DRW_shgroup_call(grp, geom, NULL);
             break;
+          case GPU_MAT_QUEUED:
+            stl->g_data->queued_shaders_count++;
+            col = queue_col;
+            break;
           default:
             col = error_col;
             break;

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

@@ -1000,6 +1000,7 @@ void EEVEE_materials_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
             break;
           case GPU_MAT_QUEUED:
             /* TODO Bypass probe compilation. */
+            stl->g_data->queued_shaders_count++;
             col = compile_col;
             break;
           case GPU_MAT_FAILED:
@@ -1352,6 +1353,7 @@ static void material_opaque(Material *ma,
         break;
       }
       case GPU_MAT_QUEUED: {
+        stl->g_data->queued_shaders_count++;
         color_p = compile_col;
         metal_p = spec_p = rough_p = ½
         break;
@@ -1458,6 +1460,7 @@ static void material_transparent(Material *ma,
       }
       case GPU_MAT_QUEUED: {
         /* TODO Bypass probe compilation. */
+        stl->g_data->queued_shaders_count++;
         color_p = compile_col;
         metal_p = spec_p = rough_p = ½
         break;
@@ -1785,6 +1788,7 @@ void EEVEE_hair_cache_populate(EEVEE_Data *vedata,
               break;
             }
             case GPU_MAT_QUEUED: {
+              stl->g_data->queued_shaders_count++;
               color_p = compile_col;
               metal_p = spec_p = rough_p = ½
               break;

source/blender/draw/engines/eevee/eevee_private.h

@@ -840,6 +840,10 @@ typedef struct EEVEE_PrivateData {
   /* Color Management */
   bool use_color_render_settings;
 
+  /* Compiling shaders count. This is to track if a shader has finished compiling. */
+  int queued_shaders_count;
+  int queued_shaders_count_prev;
+
   /* LookDev Settings */
   int studiolight_index;
   float studiolight_rot_z;

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

@@ -394,9 +394,13 @@ void EEVEE_volumes_cache_object_add(EEVEE_ViewLayerData *sldata,
   }
 
   struct GPUMaterial *mat = EEVEE_material_mesh_volume_get(scene, ma);
+  eGPUMaterialStatus status = GPU_material_status(mat);
 
+  if (status == GPU_MAT_QUEUED) {
+    vedata->stl->g_data->queued_shaders_count++;
+  }
   /* If shader failed to compile or is currently compiling. */
-  if (GPU_material_status(mat) != GPU_MAT_SUCCESS) {
+  if (status != GPU_MAT_SUCCESS) {
     return;
   }