EEVEE: Fix volumetric resolve in large scenes.

On NVIDIA volumetric resolve failed for large production scenes.
The result would remove most color from the final render. The cause
seems to be a faulty driver.

This change ported the fragment shader to a compute shader which
would select a different compiler branch and didn't show the error.

2 files changed, 16 insertions, 0 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index 7b80ffd2b88..b49203d85f6 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -207,6 +207,10 @@ struct GPUShader *DRW_shader_create_with_lib_ex(const char *vert,
                                                 const char *lib,
                                                 const char *defines,
                                                 const char *name);
+struct GPUShader *DRW_shader_create_compute_with_shaderlib(const char *comp,
+                                                           const DRWShaderLibrary *lib,
+                                                           const char *defines,
+                                                           const char *name);
 struct GPUShader *DRW_shader_create_with_shaderlib_ex(const char *vert,
                                                       const char *geom,
                                                       const char *frag,
diff --git a/source/blender/draw/intern/draw_manager_shader.c b/source/blender/draw/intern/draw_manager_shader.c
index 4bc3898c5e7..1ada99093c6 100644
--- a/source/blender/draw/intern/draw_manager_shader.c
+++ b/source/blender/draw/intern/draw_manager_shader.c
@@ -297,6 +297,18 @@ GPUShader *DRW_shader_create_with_lib_ex(const char *vert,
   return sh;
 }
 
+GPUShader *DRW_shader_create_compute_with_shaderlib(const char *comp,
+                                                    const DRWShaderLibrary *lib,
+                                                    const char *defines,
+                                                    const char *name)
+{
+  char *comp_with_lib = DRW_shader_library_create_shader_string(lib, comp);
+  GPUShader *sh = GPU_shader_create_compute(comp_with_lib, NULL, defines, name);
+  MEM_SAFE_FREE(comp_with_lib);
+
+  return sh;
+}
+
 GPUShader *DRW_shader_create_with_shaderlib_ex(const char *vert,
                                                const char *geom,
                                                const char *frag,