wined3d: Use GL_ARB_shading_language_420pack for swizzle operations on scalars.

dlls/wined3d/directx.c

@@ -152,6 +152,7 @@ static const struct wined3d_extension_map gl_extension_map[] =
     {"GL_ARB_shader_image_size",            ARB_SHADER_IMAGE_SIZE         },
     {"GL_ARB_shader_texture_lod",           ARB_SHADER_TEXTURE_LOD        },
     {"GL_ARB_shading_language_100",         ARB_SHADING_LANGUAGE_100      },
+    {"GL_ARB_shading_language_420pack",     ARB_SHADING_LANGUAGE_420PACK  },
     {"GL_ARB_shading_language_packing",     ARB_SHADING_LANGUAGE_PACKING  },
     {"GL_ARB_shadow",                       ARB_SHADOW                    },
     {"GL_ARB_stencil_texturing",            ARB_STENCIL_TEXTURING         },
@@ -3717,6 +3718,7 @@ static BOOL wined3d_adapter_init_gl_caps(struct wined3d_adapter *adapter, DWORD
         {ARB_INTERNALFORMAT_QUERY,         MAKEDWORD_VERSION(4, 2)},
         {ARB_MAP_BUFFER_ALIGNMENT,         MAKEDWORD_VERSION(4, 2)},
         {ARB_SHADER_IMAGE_LOAD_STORE,      MAKEDWORD_VERSION(4, 2)},
+        {ARB_SHADING_LANGUAGE_420PACK,     MAKEDWORD_VERSION(4, 2)},
         {ARB_SHADING_LANGUAGE_PACKING,     MAKEDWORD_VERSION(4, 2)},
         {ARB_TEXTURE_COMPRESSION_BPTC,     MAKEDWORD_VERSION(4, 2)},
         {ARB_TEXTURE_STORAGE,              MAKEDWORD_VERSION(4, 2)},

dlls/wined3d/glsl_shader.c

@@ -2860,7 +2860,10 @@ static void shader_glsl_get_register_name(const struct wined3d_shader_register *
             break;
 
         case WINED3DSPR_LOCALTHREADINDEX:
-            sprintf(register_name, "ivec2(gl_LocalInvocationIndex, 0)");
+            if (gl_info->supported[ARB_SHADING_LANGUAGE_420PACK])
+                sprintf(register_name, "int(gl_LocalInvocationIndex)");
+            else
+                sprintf(register_name, "ivec2(gl_LocalInvocationIndex, 0)");
             break;
 
         case WINED3DSPR_THREADID:
@@ -6459,6 +6462,8 @@ static void shader_glsl_enable_extensions(struct wined3d_string_buffer *buffer,
         shader_addline(buffer, "#extension GL_ARB_shader_image_load_store : enable\n");
     if (gl_info->supported[ARB_SHADER_IMAGE_SIZE])
         shader_addline(buffer, "#extension GL_ARB_shader_image_size : enable\n");
+    if (gl_info->supported[ARB_SHADING_LANGUAGE_420PACK])
+        shader_addline(buffer, "#extension GL_ARB_shading_language_420pack : enable\n");
     if (gl_info->supported[ARB_SHADING_LANGUAGE_PACKING])
         shader_addline(buffer, "#extension GL_ARB_shading_language_packing : enable\n");
     if (gl_info->supported[ARB_TEXTURE_CUBE_MAP_ARRAY])

dlls/wined3d/wined3d_gl.h

@@ -85,6 +85,7 @@ enum wined3d_gl_extension
     ARB_SHADER_IMAGE_SIZE,
     ARB_SHADER_TEXTURE_LOD,
     ARB_SHADING_LANGUAGE_100,
+    ARB_SHADING_LANGUAGE_420PACK,
     ARB_SHADING_LANGUAGE_PACKING,
     ARB_SHADOW,
     ARB_STENCIL_TEXTURING,