1 files changed, 27 insertions, 0 deletions
diff --git a/source/blender/draw/engines/overlay/shaders/overlay_edit_uv_edges_vert.glsl b/source/blender/draw/engines/overlay/shaders/overlay_edit_uv_edges_vert.glsl
new file mode 100644
index 00000000000..23f1a44c321
--- /dev/null
+++ b/source/blender/draw/engines/overlay/shaders/overlay_edit_uv_edges_vert.glsl
@@ -0,0 +1,27 @@
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+
+void main()
+{
+  vec3 world_pos = point_object_to_world(vec3(au, 0.0));
+  gl_Position = point_world_to_ndc(world_pos);
+  /* Snap vertices to the pixel grid to reduce artifacts. */
+  vec2 half_viewport_res = drw_view.viewport_size * 0.5;
+  vec2 half_pixel_offset = drw_view.viewport_size_inverse * 0.5;
+  gl_Position.xy = floor(gl_Position.xy * half_viewport_res) / half_viewport_res +
+                   half_pixel_offset;
+
+#ifdef USE_EDGE_SELECT
+  bool is_select = (flag & EDGE_UV_SELECT) != 0;
+#else
+  bool is_select = (flag & VERT_UV_SELECT) != 0;
+#endif
+  geom_in.selectionFac = is_select ? 1.0 : 0.0;
+  /* Move selected edges to the top
+   * Vertices are between 0.0 and 0.2, Edges between 0.2 and 0.4
+   * actual pixels are at 0.75, 1.0 is used for the background. */
+  float depth = is_select ? 0.25 : 0.35;
+  gl_Position.z = depth;
+
+  /* Avoid precision loss. */
+  geom_in.stippleStart = geom_in.stipplePos = 500.0 + 500.0 * (gl_Position.xy / gl_Position.w);
+}