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Source/Shaders/Forward.shader

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#include "./Flax/Common.hlsl"
+
+Texture2D Input : register(t0);
+Texture2D Distortion : register(t1);
+
+// Pixel shader for applying distortion pass results to the combined frame
+META_PS(true, FEATURE_LEVEL_ES2)
+float4 PS_ApplyDistortion(Quad_VS2PS input) : SV_Target
+{
+	// Sample accumulated distortion offset
+	half4 accumDist = Distortion.Sample(SamplerPointClamp, input.TexCoord);
+
+	// Offset = [R-B,G-A]
+	half2 distOffset = (accumDist.rg - accumDist.ba);
+
+	static const half InvDistortionScaleBias = 1 / 4.0f;
+	distOffset *= InvDistortionScaleBias;
+
+	float2 newTexCoord = input.TexCoord + distOffset;
+
+	// If we're about to sample outside the valid area, set to 0 distortion
+	FLATTEN
+	if (newTexCoord.x < 0 || newTexCoord.x > 1 || newTexCoord.y < 0 || newTexCoord.y > 1)
+	{
+		newTexCoord = input.TexCoord;
+	}
+
+	// Sample screen using offset coords
+	return Input.SampleLevel(SamplerPointClamp, newTexCoord, 0);
+}