3D View: add opacity for sculpt mask display

This matches vertex/texture paint opacity options.

Useful because 0.75 is sometimes too dark to see the surface shading.

Resolves T63746

2 files changed, 9 insertions, 2 deletions

diff --git a/source/blender/draw/modes/sculpt_mode.c b/source/blender/draw/modes/sculpt_mode.c
index b25a8af795b..e2b73a0fac7 100644
--- a/source/blender/draw/modes/sculpt_mode.c
+++ b/source/blender/draw/modes/sculpt_mode.c
@@ -135,9 +135,15 @@ static void SCULPT_cache_init(void *vedata)
   }
 
   {
+    const DRWContextState *draw_ctx = DRW_context_state_get();
+    View3D *v3d = draw_ctx->v3d;
+
     DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_EQUAL | DRW_STATE_MULTIPLY;
     psl->pass = DRW_pass_create("Sculpt Pass", state);
-    stl->g_data->group_smooth = DRW_shgroup_create(e_data.shader_smooth, psl->pass);
+
+    DRWShadingGroup *shgrp = DRW_shgroup_create(e_data.shader_smooth, psl->pass);
+    DRW_shgroup_uniform_float(shgrp, "maskOpacity", &v3d->overlay.sculpt_mode_mask_opacity, 1);
+    stl->g_data->group_smooth = shgrp;
   }
 }
 
diff --git a/source/blender/draw/modes/shaders/sculpt_mask_vert.glsl b/source/blender/draw/modes/shaders/sculpt_mask_vert.glsl
index 5ae97ec5cb9..e5e34fee57e 100644
--- a/source/blender/draw/modes/shaders/sculpt_mask_vert.glsl
+++ b/source/blender/draw/modes/shaders/sculpt_mask_vert.glsl
@@ -1,5 +1,6 @@
 
 uniform mat4 ModelViewProjectionMatrix;
+uniform float maskOpacity;
 
 in vec3 pos;
 in float msk;
@@ -10,6 +11,6 @@ void main()
 {
   gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
 
-  float mask = 1.0 - msk * 0.75;
+  float mask = 1.0 - (msk * maskOpacity);
   finalColor = vec4(mask, mask, mask, 1.0);
 }