Implement Stencil Mask Drawing for Texture Painting

Stencil mask drawing was not implemented yet. This commit will implement this for texture painting.
It brings the state back to how it was for B279.

Reviewed By: fclem

Maniphest Tasks: T58727

Differential Revision: https://developer.blender.org/D4570

1 files changed, 13 insertions, 1 deletions

diff --git a/source/blender/draw/modes/shaders/paint_texture_vert.glsl b/source/blender/draw/modes/shaders/paint_texture_vert.glsl
index c53439f46a0..43a353f0278 100644
--- a/source/blender/draw/modes/shaders/paint_texture_vert.glsl
+++ b/source/blender/draw/modes/shaders/paint_texture_vert.glsl
@@ -5,15 +5,27 @@ uniform mat4 ModelMatrix;
 in vec2 u; /* active uv map */
 in vec3 pos;
 
+#ifdef TEXTURE_PAINT_MASK
+in vec2 mu; /* masking uv map */
+#endif
+
 out vec2 uv_interp;
 
+#ifdef TEXTURE_PAINT_MASK
+out vec2 masking_uv_interp;
+#endif
+
 void main()
 {
 	gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
 
 	uv_interp = u;
 
+#ifdef TEXTURE_PAINT_MASK
+	masking_uv_interp = mu;
+#endif
+
 #ifdef USE_WORLD_CLIP_PLANES
-		world_clip_planes_calc_clip_distance((ModelMatrix * vec4(pos, 1.0)).xyz);
+	world_clip_planes_calc_clip_distance((ModelMatrix * vec4(pos, 1.0)).xyz);
 #endif
 }