Edit Mode: Change face mode edges display

This improve visibility in edit face select mode by using the face select color
instead of the edge select color (which is in default theme a bit more red). Also
makes the selected edges in this mode a bit more opaque (0.75 instead of  0.4).
Full opacity is still reserved for edge select mode.

3 files changed, 13 insertions, 8 deletions

diff --git a/source/blender/draw/modes/shaders/edit_mesh_overlay_common_lib.glsl b/source/blender/draw/modes/shaders/edit_mesh_overlay_common_lib.glsl
index 50e9c3677f9..7d4cba66933 100644
--- a/source/blender/draw/modes/shaders/edit_mesh_overlay_common_lib.glsl
+++ b/source/blender/draw/modes/shaders/edit_mesh_overlay_common_lib.glsl
@@ -17,16 +17,21 @@ vec4 EDIT_MESH_edge_color_outer(int edge_flag, int face_flag, float crease, floa
 vec4 EDIT_MESH_edge_color_inner(int edge_flag)
 {
   vec4 color = colorWireEdit;
-  color = (doEdges && ((edge_flag & EDGE_SELECTED) != 0)) ? colorEdgeSelect : color;
+  vec4 color_select = (selectEdges) ? colorEdgeSelect : colorFaceSelect;
+  color = (doEdges && ((edge_flag & EDGE_SELECTED) != 0)) ? color_select : color;
   color = (doEdges && ((edge_flag & EDGE_ACTIVE) != 0)) ? colorEditMeshActive : color;
+
+  float non_edge_select_alpha = (selectFaces && (edge_flag & EDGE_SELECTED) != 0) ? 0.75 : 0.4;
+  color.a = (selectEdges) ? 1.0 : non_edge_select_alpha;
   return color;
 }
 
 vec4 EDIT_MESH_edge_vertex_color(int vertex_flag)
 {
   vec4 color = colorWireEdit;
-  color = (doEdges && (vertex_flag & (VERT_ACTIVE | VERT_SELECTED)) != 0) ? colorEdgeSelect :
-                                                                            color;
+  vec4 color_select = (selectEdges) ? colorEdgeSelect : colorFaceSelect;
+  color = (doEdges && (vertex_flag & (VERT_ACTIVE | VERT_SELECTED)) != 0) ? color_select : color;
+  color.a = (selectEdges) ? 1.0 : 0.4;
   return color;
 }
 
@@ -46,10 +51,10 @@ vec4 EDIT_MESH_vertex_color(int vertex_flag)
 vec4 EDIT_MESH_face_color(int face_flag)
 {
   vec4 color = colorFace;
+  vec4 color_active = mix(colorFaceSelect, colorEditMeshActive, 0.5);
   color = ((face_flag & FACE_FREESTYLE) != 0) ? colorFaceFreestyle : color;
   color = ((face_flag & FACE_SELECTED) != 0) ? colorFaceSelect : color;
-  color = ((face_flag & FACE_ACTIVE) != 0) ? mix(colorFaceSelect, colorEditMeshActive, 0.5) :
-                                             color;
+  color = ((face_flag & FACE_ACTIVE) != 0) ? color_active : color;
   color.a *= ((face_flag & (FACE_FREESTYLE | FACE_SELECTED | FACE_ACTIVE)) == 0 || selectFaces) ?
                  1.0 :
                  0.5;
diff --git a/source/blender/draw/modes/shaders/edit_mesh_overlay_frag.glsl b/source/blender/draw/modes/shaders/edit_mesh_overlay_frag.glsl
index 5f1008b2f72..2c2cd1f0610 100644
--- a/source/blender/draw/modes/shaders/edit_mesh_overlay_frag.glsl
+++ b/source/blender/draw/modes/shaders/edit_mesh_overlay_frag.glsl
@@ -29,7 +29,8 @@ void main()
   float mix_w = step(0.5, dist);
   float mix_w_outer = step(0.5, dist_outer);
 #endif
+  /* Line color & alpha. */
   FragColor = mix(finalColorOuter_f, finalColor_f, 1.0 - mix_w * finalColorOuter_f.a);
+  /* Line edges shape. */
   FragColor.a *= 1.0 - (finalColorOuter_f.a > 0.0 ? mix_w_outer : mix_w);
-  FragColor.a *= (selectEdges) ? 1.0 : 0.4;
 }
diff --git a/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl b/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl
index 6b93193c9ae..d700e69fb57 100644
--- a/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl
+++ b/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl
@@ -82,8 +82,7 @@ void main()
   float facing = dot(view_vec, view_normal);
   facing = 1.0 - abs(facing) * 0.2;
 
-  finalColor = mix(colorEditMeshMiddle, finalColor, facing);
-  finalColor.a = 1.0;
+  finalColor.rgb = mix(colorEditMeshMiddle.rgb, finalColor.rgb, facing);
 
 #endif