Workbench: normal packing

Normal packing. The sign is stored in the A of the color buffer.
if the A == 1.0 the normal should be inverted. before use.

The reason is that packing has more precision for frontfaces, than for
backfaces

1 files changed, 9 insertions, 5 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl
index 89e5b882536..6a5d6c71aba 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl
@@ -40,18 +40,22 @@ void main()
 	}
 #endif /* !V3D_DRAWOPTION_OBJECT_OVERLAP */
 
-	vec3 diffuse_color = texelFetch(colorBuffer, texel, 0).rgb;
 
 #ifdef V3D_LIGHTING_STUDIO
+	vec4 diffuse_color = texelFetch(colorBuffer, texel, 0);
 #ifdef WORKBENCH_ENCODE_NORMALS
-	vec3 normal_viewport = normal_decode(texelFetch(normalBuffer, texel, 0).rgb);
-#else
+	vec3 normal_viewport = normal_decode(texelFetch(normalBuffer, texel, 0).rg);
+	if (diffuse_color.a == 1.0) {
+		normal_viewport = - normal_viewport;
+	}
+#else /* WORKBENCH_ENCODE_NORMALS */
 	vec3 normal_viewport = texelFetch(normalBuffer, texel, 0).rgb;
-#endif
+#endif /* WORKBENCH_ENCODE_NORMALS */
 	vec3 diffuse_light = get_world_diffuse_light(world_data, normal_viewport);
-	vec3 shaded_color = diffuse_light * diffuse_color;
+	vec3 shaded_color = diffuse_light * diffuse_color.rgb;
 
 #else /* V3D_LIGHTING_STUDIO */
+	vec3 diffuse_color = texelFetch(colorBuffer, texel, 0).rgb;
 	vec3 shaded_color = diffuse_color;
 #endif /* V3D_LIGHTING_STUDIO */