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diff --git a/src/demos/dualDepthPeeling/shader/wsum_final.fp b/src/demos/dualDepthPeeling/shader/wsum_final.fp
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+++ b/src/demos/dualDepthPeeling/shader/wsum_final.fp
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+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Weighted Sums
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT ColorTex;
+uniform vec3 BackgroundColor;
+
+// Sum(A_i * C_i) + C_bg * (1 - Sum(A_i))
+void main(void)
+{
+	vec4 S = textureRect(ColorTex, gl_FragCoord.xy);
+	gl_FragColor.rgb = S.rgb + BackgroundColor * (1.0 - S.a);
+}