1 files changed, 10 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_difference_matte.glsl b/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_difference_matte.glsl
new file mode 100644
index 00000000000..d769cadce3c
--- /dev/null
+++ b/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_difference_matte.glsl
@@ -0,0 +1,10 @@
+void node_composite_difference_matte(
+    vec4 color, vec4 key, float tolerance, float falloff, out vec4 result, out float matte)
+{
+  vec4 difference = abs(color - key);
+  float average_difference = (difference.r + difference.g + difference.b) / 3.0;
+  bool is_opaque = average_difference > tolerance + falloff;
+  float alpha = is_opaque ? color.a : (max(0.0, average_difference - tolerance) / falloff);
+  matte = min(alpha, color.a);
+  result = color * matte;
+}