1 files changed, 14 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_luminance_matte.glsl b/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_luminance_matte.glsl
new file mode 100644
index 00000000000..3647ac583fe
--- /dev/null
+++ b/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_luminance_matte.glsl
@@ -0,0 +1,14 @@
+#pragma BLENDER_REQUIRE(gpu_shader_common_color_utils.glsl)
+
+void node_composite_luminance_matte(vec4 color,
+                                    float high,
+                                    float low,
+                                    const vec3 luminance_coefficients,
+                                    out vec4 result,
+                                    out float matte)
+{
+  float luminance = get_luminance(color.rgb, luminance_coefficients);
+  float alpha = clamp(0.0, 1.0, (luminance - low) / (high - low));
+  matte = min(alpha, color.a);
+  result = color * matte;
+}