60 lines
1.7 KiB
Text
60 lines
1.7 KiB
Text
#pragma kernel CSMain
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
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RWTexture2D<float4> Result;
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texture2D<float4> InputTextureRed;
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bool invertRed;
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uint inputChannelRed;
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texture2D<float4> InputTextureGreen;
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bool invertGreen;
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uint inputChannelGreen;
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texture2D<float4> InputTextureBlue;
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bool invertBlue;
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uint inputChannelBlue;
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texture2D<float4> InputTextureAlpha;
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bool invertAlpha;
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uint inputChannelAlpha;
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SamplerState _LinearClamp;
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float InvertColor(float input, bool invert) {
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return invert ? 1 - input : input;
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}
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float ExtractData(float2 UV, texture2D InputTexture, uint inputChannel) {
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float returnfloat = 0; //To avoid 'use of potentially uninitialized variable' warning
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float4 colors = LinearToSRGB(InputTexture.SampleLevel(_LinearClamp, UV, 0));
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if (inputChannel == 0) returnfloat = colors.r;
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else if (inputChannel == 1) returnfloat = colors.g;
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else if (inputChannel == 2) returnfloat = colors.b;
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else if (inputChannel == 3) returnfloat = colors.a;
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return returnfloat;
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}
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[numthreads(32,32,1)]
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void CSMain (uint2 id : SV_DispatchThreadID)
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{
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float4 colorBuffer = float4(0, 0, 0, 1);
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float2 wh = (float2)0;
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Result.GetDimensions(wh.x, wh.y);
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float2 UV = (id + 0.5) / wh;
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colorBuffer.r = InvertColor(ExtractData(UV.xy, InputTextureRed, inputChannelRed), invertRed);
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colorBuffer.g = InvertColor(ExtractData(UV.xy, InputTextureGreen, inputChannelGreen), invertGreen);
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colorBuffer.b = InvertColor(ExtractData(UV.xy, InputTextureBlue, inputChannelBlue), invertBlue);
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colorBuffer.a = InvertColor(ExtractData(UV.xy, InputTextureAlpha, inputChannelAlpha), invertAlpha);
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Result[id.xy] = colorBuffer;
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}
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