source/blender/draw/CMakeLists.txt

@@ -467,6 +467,7 @@ set(GLSL_SRC
   engines/eevee_next/shaders/eevee_sampling_lib.glsl
   engines/eevee_next/shaders/eevee_shadow_debug_frag.glsl
   engines/eevee_next/shaders/eevee_shadow_lib.glsl
+  engines/eevee_next/shaders/eevee_shadow_clipmap_clear_comp.glsl
   engines/eevee_next/shaders/eevee_shadow_page_allocate_comp.glsl
   engines/eevee_next/shaders/eevee_shadow_page_clear_comp.glsl
   engines/eevee_next/shaders/eevee_shadow_page_defrag_comp.glsl

source/blender/draw/engines/eevee_next/eevee_defines.hh

@@ -54,6 +54,7 @@
 #define SHADOW_PAGE_PER_ROW 64
 #define SHADOW_ATLAS_SLOT 5
 #define SHADOW_BOUNDS_GROUP_SIZE 64
+#define SHADOW_CLIPMAP_GROUP_SIZE 64
 #define SHADOW_VIEW_MAX 64 /* Must match DRW_VIEW_MAX. */
 
 /* Ray-tracing. */

source/blender/draw/engines/eevee_next/eevee_shader.cc

@@ -142,6 +142,8 @@ const char *ShaderModule::static_shader_create_info_name_get(eShaderType shader_
       return "eevee_light_culling_tile";
     case LIGHT_CULLING_ZBIN:
       return "eevee_light_culling_zbin";
+    case SHADOW_CLIPMAP_CLEAR:
+      return "eevee_shadow_clipmap_clear";
     case SHADOW_DEBUG:
       return "eevee_shadow_debug";
     case SHADOW_PAGE_ALLOCATE:

source/blender/draw/engines/eevee_next/eevee_shader.hh

@@ -62,6 +62,7 @@ enum eShaderType {
   MOTION_BLUR_TILE_FLATTEN_RENDER,
   MOTION_BLUR_TILE_FLATTEN_VIEWPORT,
 
+  SHADOW_CLIPMAP_CLEAR,
   SHADOW_DEBUG,
   SHADOW_PAGE_ALLOCATE,
   SHADOW_PAGE_CLEAR,

source/blender/draw/engines/eevee_next/eevee_shadow.cc

@@ -835,17 +835,6 @@ void ShadowModule::end_sync()
     /* Clear tiles to not reference any page. */
     tilemap_pool.tiles_data.clear_to_zero();
 
-    /* Clear tile-map clip buffer. */
-    union {
-      ShadowTileMapClip clip;
-      int4 i;
-    } u;
-    u.clip.clip_near_stored = 0.0f;
-    u.clip.clip_far_stored = 0.0f;
-    u.clip.clip_near = int(0xFF7FFFFFu ^ 0x7FFFFFFFu); /* floatBitsToOrderedInt(-FLT_MAX) */
-    u.clip.clip_far = 0x7F7FFFFF;                      /* floatBitsToOrderedInt(FLT_MAX) */
-    GPU_storagebuf_clear(tilemap_pool.tilemaps_clip, GPU_RGBA32I, GPU_DATA_INT, &u.i);
-
     /* Clear cached page buffer. */
     int2 data = {-1, -1};
     GPU_storagebuf_clear(pages_cached_data_, GPU_RG32I, GPU_DATA_INT, &data);
@@ -867,6 +856,17 @@ void ShadowModule::end_sync()
       PassSimple &pass = tilemap_setup_ps_;
       pass.init();
 
+      {
+        /** Clear tile-map clip buffer. */
+        PassSimple::Sub &sub = pass.sub("ClearClipmap");
+        sub.shader_set(inst_.shaders.static_shader_get(SHADOW_CLIPMAP_CLEAR));
+        sub.bind_ssbo("tilemaps_clip_buf", tilemap_pool.tilemaps_clip);
+        sub.push_constant("tilemaps_clip_buf_len", int(tilemap_pool.tilemaps_clip.size()));
+        sub.dispatch(int3(
+            divide_ceil_u(tilemap_pool.tilemaps_clip.size(), SHADOW_CLIPMAP_GROUP_SIZE), 1, 1));
+        sub.barrier(GPU_BARRIER_SHADER_STORAGE);
+      }
+
       {
         /** Compute near/far clip distances for directional shadows based on casters bounds. */
         PassSimple::Sub &sub = pass.sub("DirectionalBounds");

source/blender/draw/engines/eevee_next/shaders/eevee_shadow_clipmap_clear_comp.glsl

@@ -0,0 +1,13 @@
+
+#pragma BLENDER_REQUIRE(gpu_shader_utildefines_lib.glsl)
+
+void main()
+{
+  int index = int(gl_GlobalInvocationID.x);
+  if (index < tilemaps_clip_buf_len) {
+    tilemaps_clip_buf[index].clip_near_stored = 0;
+    tilemaps_clip_buf[index].clip_far_stored = 0;
+    tilemaps_clip_buf[index].clip_near = floatBitsToOrderedInt(-FLT_MAX);
+    tilemaps_clip_buf[index].clip_far = floatBitsToOrderedInt(FLT_MAX);
+  }
+}

source/blender/draw/engines/eevee_next/shaders/infos/eevee_shadow_info.hh

@@ -8,6 +8,14 @@
 /** \name Shadow pipeline
  * \{ */
 
+GPU_SHADER_CREATE_INFO(eevee_shadow_clipmap_clear)
+    .do_static_compilation(true)
+    .local_group_size(SHADOW_CLIPMAP_GROUP_SIZE)
+    .storage_buf(0, Qualifier::WRITE, "ShadowTileMapClip", "tilemaps_clip_buf[]")
+    .push_constant(Type::INT, "tilemaps_clip_buf_len")
+    .additional_info("eevee_shared")
+    .compute_source("eevee_shadow_clipmap_clear_comp.glsl");
+
 GPU_SHADER_CREATE_INFO(eevee_shadow_tilemap_bounds)
     .do_static_compilation(true)
     .local_group_size(SHADOW_BOUNDS_GROUP_SIZE)