forked from BilalY/Rasagar
100 lines
3.7 KiB
Plaintext
100 lines
3.7 KiB
Plaintext
Shader "Hidden/Universal Render Pipeline/Scaling Setup"
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{
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HLSLINCLUDE
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#pragma multi_compile_local_fragment _ _FXAA
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#pragma multi_compile_local_fragment _ _GAMMA_20 _GAMMA_20_AND_HDR_INPUT
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#pragma multi_compile_local_fragment _ _ENABLE_ALPHA_OUTPUT
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#if defined(_GAMMA_20_AND_HDR_INPUT)
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#define _GAMMA_20 1
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#define HDR_INPUT 1
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#endif
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/Shaders/PostProcessing/Common.hlsl"
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float4 _SourceSize;
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float4 _HDROutputLuminanceParams;
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#define PaperWhite _HDROutputLuminanceParams.z
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#define OneOverPaperWhite _HDROutputLuminanceParams.w
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half4 FragScalingSetup(Varyings input) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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float2 uv = UnityStereoTransformScreenSpaceTex(input.texcoord);
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float2 positionNDC = uv;
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int2 positionSS = uv * _SourceSize.xy;
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half4 color = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_PointClamp, uv);
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#if _FXAA
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#if _ENABLE_ALPHA_OUTPUT
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// When alpha processing is enabled, FXAA should not affect pixels with zero alpha
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UNITY_BRANCH
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if(color.a > 0)
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color.rgb = ApplyFXAA(color.rgb, positionNDC, positionSS, _SourceSize, _BlitTexture, PaperWhite, OneOverPaperWhite);
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#else
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color.rgb = ApplyFXAA(color.rgb, positionNDC, positionSS, _SourceSize, _BlitTexture, PaperWhite, OneOverPaperWhite);
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#endif
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#endif
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#if _GAMMA_20 && !UNITY_COLORSPACE_GAMMA
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#ifdef HDR_INPUT
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// In HDR output mode, the colors are expressed in nits, which can go up to 10k nits.
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// We divide by the display max nits to get a max value closer to 1.0 but it could still be > 1.0.
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// Finally, use FastTonemap() to squash everything < 1.0.
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color = FastTonemap(color * OneOverPaperWhite);
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#endif
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// EASU expects perceptually encoded color data so either encode to gamma 2.0 here if the input
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// data is linear, or let it pass through unchanged if it's already gamma encoded.
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color = LinearToGamma20(color);
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#endif
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#if _ENABLE_ALPHA_OUTPUT
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// Alpha will lose precision and band due to low bits in alpha.
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// Should be fine for alpha test mask.
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// Or a simple 2-bit dither can be done.
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// uint2 b = positionSS & 1;
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// uint dp = b.y ? (b.x ? 1 : 3) : (b.x ? 2 : 0);
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// half d = ((dp / 3.0) - 0.5) * 0.25;
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// color.a += d;
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return color;
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#else
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return half4(color.rgb, 1.0);
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#endif
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}
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ENDHLSL
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///
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/// Scaling Setup Shader
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///
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/// This shader is used to perform any operations that need to place before image scaling occurs.
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/// It is not expected to be executed unless image scaling is active.
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///
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/// Supported Operations:
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///
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/// FXAA
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/// The FXAA shader does not support mismatched input and output dimensions so it must be run before any image
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/// scaling takes place.
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///
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SubShader
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{
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Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline"}
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LOD 100
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ZTest Always ZWrite Off Cull Off
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Pass
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{
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Name "ScalingSetup"
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HLSLPROGRAM
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#pragma vertex Vert
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#pragma fragment FragScalingSetup
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ENDHLSL
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}
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}
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}
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