109 lines
3.6 KiB
Plaintext
109 lines
3.6 KiB
Plaintext
Shader "SLS/Postprocessing/AnimeACES"
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{
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SubShader
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{
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Tags
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{
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"RenderType" = "Opaque"
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"RenderPipeline" = "UniversalPipeline"
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}
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ZWrite Off
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Cull Off
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ZTest Always
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Pass
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{
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Name "Anime ACES Tonemapping"
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Blend Off // 强制覆盖
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HLSLPROGRAM
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#pragma vertex Vert
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#pragma fragment Frag
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#include "Packages/com.unity.render-pipelines.core/Runtime/Utilities/Blit.hlsl"
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// --- 参数定义 ---
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float4 _TonemapParams;
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// x: Exposure
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// y: Contrast
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// z: Saturation
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// w: Hue Preservation (新增：色彩保留强度 0-1)
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float4 _ACESCoeffs;
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// x: A, y: B, z: C, w: D
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float _ACES_E; // E
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float4 _ColorFilter;
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// Narkowicz ACES 曲线
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float3 ACESCurve(float3 x)
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{
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float a = _ACESCoeffs.x;
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float b = _ACESCoeffs.y;
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float c = _ACESCoeffs.z;
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float d = _ACESCoeffs.w;
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float e = _ACES_E;
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return saturate((x * (a * x + b)) / (x * (c * x + d) + e));
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}
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// 标量版本
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float ACESCurve(float x)
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{
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float a = _ACESCoeffs.x;
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float b = _ACESCoeffs.y;
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float c = _ACESCoeffs.z;
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float d = _ACESCoeffs.w;
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float e = _ACES_E;
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return saturate((x * (a * x + b)) / (x * (c * x + d) + e));
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}
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half4 Frag(Varyings input) : SV_Target
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{
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float2 uv = input.texcoord;
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half4 sceneColor = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uv);
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half3 color = sceneColor.rgb;
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// 1. Exposure (曝光)
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color *= _TonemapParams.x;
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// 2. Contrast (对比度) - 【核心修正】
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// Pivot 从 0.5 改为 0.18 (Linear Middle Gray)
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// 这样增加对比度会压暗阴影，而不是提亮阴影
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float midGray = 0.18;
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color = (color - midGray) * _TonemapParams.y + midGray;
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color = max(0, color);
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// 3. ACES Tonemapping with Hue Preservation (色彩保留) - 【核心修正】
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float huePreserve = _TonemapParams.w;
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// A. 标准 ACES (会吃色，RGB 通道独立压缩)
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float3 acesFit = ACESCurve(color);
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// B. 亮度 ACES (不吃色，只压缩亮度)
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float lum = Luminance(color);
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float lumTonemapped = ACESCurve(lum);
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// 重建颜色：保持原色相，只改变亮度
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float3 colorPreserved = color * (lumTonemapped / max(lum, 1e-4));
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// 混合两者：二次元通常希望皮肤保色(B)，但场景光影有电影感(A)
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// 建议 Hue Preservation 设为 0.5 左右
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color = lerp(acesFit, colorPreserved, huePreserve);
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// 4. Saturation (饱和度)
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// 重新计算亮度进行饱和度调整
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float finalLum = Luminance(color);
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color = lerp(finalLum.xxx, color, _TonemapParams.z);
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// 5. Color Filter
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color *= _ColorFilter.rgb;
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return half4(color, sceneColor.a);
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}
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ENDHLSL
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}
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}
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} |