122 lines
4.5 KiB
Plaintext
122 lines
4.5 KiB
Plaintext
Shader "SLS/Postprocessing/AdvancedChromaticAberration"
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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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HLSLINCLUDE
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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 _ACA_Params1;
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// x: Intensity (总强度)
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// y: Center X
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// z: Center Y
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// w: Mask Radius (中心保留半径)
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float4 _ACA_Params2;
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// x: Jitter Intensity
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// y: Jitter Speed
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// z: Dispersion Map Strength (贴图影响力度)
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// w: Mask Hardness (边缘硬度)
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float4 _ACA_Split; // x: R权重, y: G权重, z: B权重
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// 纹理
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TEXTURE2D(_DispersionMap);
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SAMPLER(sampler_DispersionMap); // 建议设置为 Repeat 模式
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// --- 辅助函数 ---
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// 简单的伪随机函数 (0-1)
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float random(float2 uv)
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{
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return frac(sin(dot(uv, float2(12.9898, 78.233))) * 43758.5453123);
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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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// 1. 参数解包
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float intensity = _ACA_Params1.x;
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float2 center = _ACA_Params1.yz;
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float maskRadius = _ACA_Params1.w;
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float jitterAmount = _ACA_Params2.x;
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float jitterSpeed = _ACA_Params2.y;
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float mapStrength = _ACA_Params2.z;
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float maskHardness = _ACA_Params2.w;
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float3 splitWeights = _ACA_Split.rgb;
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// 2. 计算基础方向向量 (径向)
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float2 dir = uv - center;
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float dist = length(dir);
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// 3. 计算中心遮罩 (Vignette Mask)
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// 距离小于 Radius 的地方强度为 0，向外渐变
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float mask = smoothstep(maskRadius, maskRadius + maskHardness, dist);
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// 如果在遮罩内，直接返回原图，节省性能
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// (为了 Jitter 的连贯性，这里我们只把 mask 乘到 offset 上，不直接 return)
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// 4. 计算 Jitter (采样抖动)
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// 利用 Time 和 UV 做随机，模拟不稳定的信号
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float timeVal = _Time.y * jitterSpeed;
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// 这里的 floor 模拟“跳动”的帧率感，如果想要平滑 jitter 可以去掉 floor
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float2 jitterUV = uv + float2(random(uv + timeVal), random(uv - timeVal)) * 0.1;
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float2 jitterOffset = (float2(random(jitterUV), random(jitterUV * 1.5)) - 0.5) * 2.0; // -1 ~ 1
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jitterOffset *= jitterAmount * 0.05; // 缩放幅度
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// 5. 采样 Dispersion Map (破碎感)
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// 让贴图随时间缓慢流动一点点，或者固定
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float4 noiseTex = SAMPLE_TEXTURE2D(_DispersionMap, sampler_DispersionMap, uv * 3.0 + jitterOffset); // 缩放 UV
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float noiseFactor = noiseTex.r * 2.0 - 1.0; // -1 ~ 1
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// 混合 Map 影响
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// 如果 mapStrength 为 0，则 noiseFactor 为 0 (不影响)，我们希望默认为 1
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float finalNoise = lerp(1.0, noiseFactor, mapStrength);
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// 6. 组合最终偏移量
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// 基础方向 * (1 + 噪声) + 抖动
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float2 finalOffset = dir * finalNoise;
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// 加上纯粹的位置抖动 (不依赖方向)
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finalOffset += jitterOffset;
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// 应用遮罩和总强度
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finalOffset *= mask * intensity;
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// 7. 分离通道采样
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// 注意：URP 的 _BlitTexture 采样时最好 Clamp，防止边缘溢出
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float2 uvR = uv - finalOffset * splitWeights.r;
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float2 uvG = uv - finalOffset * splitWeights.g;
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float2 uvB = uv - finalOffset * splitWeights.b;
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half r = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uvR).r;
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half g = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uvG).g;
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half b = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uvB).b;
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// 8. 重新组合
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return half4(r, g, b, 1.0);
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}
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ENDHLSL
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Pass
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{
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Name "Advanced Chromatic Aberration"
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HLSLPROGRAM
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#pragma vertex Vert
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#pragma fragment Frag
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ENDHLSL
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}
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}
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} |