1 files changed, 9 insertions, 0 deletions
diff --git a/source/blender/draw/engines/overlay/shaders/wireframe_vert.glsl b/source/blender/draw/engines/overlay/shaders/wireframe_vert.glsl
index 9b0a61b7bae..78ce8fd8a8f 100644
--- a/source/blender/draw/engines/overlay/shaders/wireframe_vert.glsl
+++ b/source/blender/draw/engines/overlay/shaders/wireframe_vert.glsl
@@ -16,6 +16,10 @@ out vec3 finalColor_g;
 out float edgeSharpness_g;
 
 #else /* USE_GEOM */
+
+flat out vec2 edgeStart;
+noperspective out vec2 edgePos;
+
 out vec3 finalColor;
 flat out float edgeSharpness;
 #  define finalColor_g finalColor
@@ -111,6 +115,11 @@ void main()
   vec3 wpos = point_object_to_world(pos);
   gl_Position = point_world_to_ndc(wpos);
 
+#if !(defined(SELECT_EDGES) || defined(USE_GEOM))
+  /* Convert to screen position [0..sizeVp]. */
+  edgePos = edgeStart = ((gl_Position.xy / gl_Position.w) * 0.5 + 0.5) * sizeViewport.xy;
+#endif
+
   edgeSharpness_g = get_edge_sharpness(wd);
 
   vec3 rim_col, wire_col;