Add stencil buffer usage with object layer information

#3080 #967

Source/Engine/Graphics/RenderBuffers.h

@@ -13,6 +13,17 @@
 #define GBUFFER2_FORMAT PixelFormat::R8G8B8A8_UNorm
 #define GBUFFER3_FORMAT PixelFormat::R8G8B8A8_UNorm
 
+// Stencil bits usage (must match GBuffer.hlsl)
+// [0] | Object Layer
+// [1] | Object Layer
+// [2] | Object Layer
+// [3] | Object Layer
+// [4] | Object Layer
+// [5] | <unsued>
+// [6] | <unsued>
+// [7] | <unsued>
+#define STENCIL_BUFFER_OBJECT_LAYER(value) uint8(value & 0x1f)
+
 /// <summary>
 /// The scene rendering buffers container.
 /// </summary>