EEVEE Next: Disable TILE_COPY shadow update method

Disabling tile_copy method for shadow update for
stability in scenes with large geometry counts
which may exceed parameter buffer size.

This pass can be re-used in future if the workload
distribution for shadow updates is changed to
better suit this method.

Authored by Apple: Michael Parkin-White

Pull Request: https://projects.blender.org/blender/blender/pulls/121623

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

@@ -660,10 +660,15 @@ void ShadowModule::init()
    * NOTE(Metal): Metal utilizes a tile-optimized approach for Apple Silicon's architecture. */
   const bool is_metal_backend = (GPU_backend_get_type() == GPU_BACKEND_METAL);
   const bool is_tile_based_arch = (GPU_platform_architecture() == GPU_ARCHITECTURE_TBDR);
+  /* Temp: Disable TILE_COPY path while efficient solution for parameter buffer overflow is
+   * identified. This path can be re-enabled in future. */
+#if 0
   if (is_metal_backend && is_tile_based_arch) {
     ShadowModule::shadow_technique = ShadowTechnique::TILE_COPY;
   }
-  else {
+  else
+#endif
+  {
     ShadowModule::shadow_technique = ShadowTechnique::ATOMIC_RASTER;
   }
 

source/blender/gpu/intern/gpu_shader_create_info.cc

@@ -545,10 +545,14 @@ void gpu_shader_create_info_init()
     /* NOTE: As atomic data types can alter shader gen if native atomics are unsupported, we need
      * to use differing create info's to handle the tile optimized check. This does prevent
      * the shadow techniques from being dynamically switchable. */
+#  if 0
+    /* Temp: Disable TILE_COPY path while efficient solution for parameter buffer overflow is
+     * identified. This path can be re-enabled in future. */
     const bool is_tile_based_arch = (GPU_platform_architecture() == GPU_ARCHITECTURE_TBDR);
     if (is_tile_based_arch) {
       eevee_shadow_data = eevee_shadow_data_non_atomic;
     }
+#  endif
   }
 #endif