Workbench: Matcaps T55291

- users can use their own matcaps
.config/blender/2.80/datafiles/studiolights/matcap/ folder
- upto 100 matcaps can be loaded
- color of the matcap is influenced by the color of the material/single
color etc. To show the plain matcap use single color at 1.0
- chosing a matcap is at lighting level (flat/studio/matcap)
- matcap only possible in solid mode
- also works for X-Ray mode

As the old matcaps are still in used by the clay engine I didn't remove
it yet.

1 files changed, 25 insertions, 12 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_deferred_composite_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_deferred_composite_frag.glsl
index 5f37490603d..326837bc69f 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_deferred_composite_frag.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_deferred_composite_frag.glsl
@@ -11,6 +11,9 @@ uniform float lightMultiplier;
 uniform float shadowShift = 0.1;
 uniform mat3 normalWorldMatrix;
 
+#ifdef STUDIOLIGHT_ORIENTATION_VIEWNORMAL
+uniform sampler2D matcapImage;
+#endif
 
 layout(std140) uniform world_block {
 	WorldData world_data;
@@ -43,16 +46,21 @@ void main()
 #endif /* !V3D_SHADING_OBJECT_OUTLINE */
 
 	vec4 diffuse_color = texelFetch(colorBuffer, texel, 0);
+
 /* Do we need normals */
 #ifdef NORMAL_VIEWPORT_PASS_ENABLED
-#ifdef WORKBENCH_ENCODE_NORMALS
+#  ifdef WORKBENCH_ENCODE_NORMALS
 	vec3 normal_viewport = normal_decode(texelFetch(normalBuffer, texel, 0).rg);
 	if (diffuse_color.a == 0.0) {
 		normal_viewport = -normal_viewport;
 	}
-#else /* WORKBENCH_ENCODE_NORMALS */
+#  else /* WORKBENCH_ENCODE_NORMALS */
 	vec3 normal_viewport = texelFetch(normalBuffer, texel, 0).rgb;
-#endif /* WORKBENCH_ENCODE_NORMALS */
+#  endif /* WORKBENCH_ENCODE_NORMALS */
+#endif
+
+#ifdef STUDIOLIGHT_ORIENTATION_VIEWNORMAL
+	diffuse_color = texture(matcapImage, normal_viewport.xy / 2.0 + 0.5);
 #endif
 
 #ifdef V3D_SHADING_SPECULAR_HIGHLIGHT
@@ -64,22 +72,27 @@ void main()
 	vec3 specular_color = vec3(0.0);
 #endif
 
+#ifdef V3D_LIGHTING_FLAT
+	vec3 diffuse_light = vec3(1.0);
+#endif
+
+#ifdef V3D_LIGHTING_MATCAP
+	/* TODO: if pixel data is matcap. then */
+	vec3 diffuse_light = texelFetch(specularBuffer, texel, 0).rgb;
+#endif
+
 #ifdef V3D_LIGHTING_STUDIO
-  #ifdef STUDIOLIGHT_ORIENTATION_CAMERA
+#  ifdef STUDIOLIGHT_ORIENTATION_CAMERA
 	vec3 diffuse_light = get_camera_diffuse_light(world_data, normal_viewport);
-  #endif
+#  endif
 
-  #ifdef STUDIOLIGHT_ORIENTATION_WORLD
+#  ifdef STUDIOLIGHT_ORIENTATION_WORLD
 	vec3 normal_world = normalWorldMatrix * normal_viewport;
 	vec3 diffuse_light = get_world_diffuse_light(world_data, normal_world);
-  #endif
+#  endif
+#endif
 	vec3 shaded_color = diffuse_light * diffuse_color.rgb + specular_color;
 
-#else /* V3D_LIGHTING_STUDIO */
-	vec3 shaded_color = diffuse_color.rgb + specular_color;
-
-#endif /* V3D_LIGHTING_STUDIO */
-
 #ifdef V3D_SHADING_SHADOW
 	float light_factor = -dot(normal_viewport, world_data.light_direction_vs.xyz);
 	/* The step function might be ok for meshes but it's