1 files changed, 30 insertions, 0 deletions
diff --git a/source/blender/draw/engines/overlay/shaders/overlay_edit_gpencil_canvas_vert.glsl b/source/blender/draw/engines/overlay/shaders/overlay_edit_gpencil_canvas_vert.glsl
new file mode 100644
index 00000000000..47d9439ed80
--- /dev/null
+++ b/source/blender/draw/engines/overlay/shaders/overlay_edit_gpencil_canvas_vert.glsl
@@ -0,0 +1,30 @@
+
+#pragma BLENDER_REQUIRE(common_view_clipping_lib.glsl)
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+
+void main()
+{
+  GPU_INTEL_VERTEX_SHADER_WORKAROUND
+
+  vec2 pos;
+  pos.x = float(gl_VertexID % 2);
+  pos.y = float(gl_VertexID / 2) / float(halfLineCount - 1);
+
+  if (pos.y > 1.0) {
+    pos.xy = pos.yx;
+    pos.x -= 1.0 + 1.0 / float(halfLineCount - 1);
+  }
+
+  pos -= 0.5;
+
+  vec3 world_pos = xAxis * pos.x + yAxis * pos.y + origin;
+
+  gl_Position = point_world_to_ndc(world_pos);
+
+  view_clipping_distances(world_pos);
+
+  finalColor = color;
+
+  /* Convert to screen position [0..sizeVp]. */
+  edgePos = edgeStart = ((gl_Position.xy / gl_Position.w) * 0.5 + 0.5) * sizeViewport.xy;
+}