1 files changed, 63 insertions, 0 deletions
diff --git a/source/blender/draw/engines/overlay/shaders/edit_uv_edges_geom.glsl b/source/blender/draw/engines/overlay/shaders/edit_uv_edges_geom.glsl
new file mode 100644
index 00000000000..4f8d553a220
--- /dev/null
+++ b/source/blender/draw/engines/overlay/shaders/edit_uv_edges_geom.glsl
@@ -0,0 +1,63 @@
+#pragma BLENDER_REQUIRE(common_globals_lib.glsl)
+#pragma BLENDER_REQUIRE(common_overlay_lib.glsl)
+
+layout(lines) in;
+layout(triangle_strip, max_vertices = 4) out;
+
+in float selectionFac[2];
+flat in vec2 stippleStart[2];
+noperspective in vec2 stipplePos[2];
+
+uniform int lineStyle;
+uniform bool doSmoothWire;
+
+out float selectionFac_f;
+noperspective out float edgeCoord_f;
+noperspective out vec2 stipplePos_f;
+flat out vec2 stippleStart_f;
+
+void do_vertex(
+    vec4 pos, float selection_fac, vec2 stipple_start, vec2 stipple_pos, float coord, vec2 offset)
+{
+  selectionFac_f = selection_fac;
+  edgeCoord_f = coord;
+  stippleStart_f = stipple_start;
+  stipplePos_f = stipple_pos;
+
+  gl_Position = pos;
+  /* Multiply offset by 2 because gl_Position range is [-1..1]. */
+  gl_Position.xy += offset * 2.0;
+  EmitVertex();
+}
+
+void main()
+{
+  vec2 ss_pos[2];
+  vec4 pos0 = gl_in[0].gl_Position;
+  vec4 pos1 = gl_in[1].gl_Position;
+  ss_pos[0] = pos0.xy / pos0.w;
+  ss_pos[1] = pos1.xy / pos1.w;
+
+  float half_size = sizeEdge;
+  /* Enlarge edge for outline drawing. */
+  /* Factor of 3.0 out of nowhere! Seems to fix issues with float imprecision. */
+  half_size += (lineStyle == OVERLAY_UV_LINE_STYLE_OUTLINE) ?
+                   max(sizeEdge * (doSmoothWire ? 1.0 : 3.0), 1.0) :
+                   0.0;
+  /* Add 1 px for AA */
+  if (doSmoothWire) {
+    half_size += 0.5;
+  }
+
+  vec2 line = ss_pos[0] - ss_pos[1];
+  vec2 line_dir = normalize(line);
+  vec2 line_perp = vec2(-line_dir.y, line_dir.x);
+  vec2 edge_ofs = line_perp * sizeViewportInv * ceil(half_size);
+
+  do_vertex(pos0, selectionFac[0], stippleStart[0], stipplePos[0], half_size, edge_ofs.xy);
+  do_vertex(pos0, selectionFac[0], stippleStart[0], stipplePos[0], -half_size, -edge_ofs.xy);
+  do_vertex(pos1, selectionFac[1], stippleStart[1], stipplePos[1], half_size, edge_ofs.xy);
+  do_vertex(pos1, selectionFac[1], stippleStart[1], stipplePos[1], -half_size, -edge_ofs.xy);
+
+  EndPrimitive();
+}