90 lines
3.1 KiB
Plaintext
90 lines
3.1 KiB
Plaintext
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Shader "SLS/Postprocessing/AdvancedVignette"
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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 _VignetteColors; // xy: Unused, z: Unused, w: Unused (颜色单独传)
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float4 _ColorInner; // 内部颜色 (过渡色)
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float4 _ColorOuter; // 外部颜色 (边缘色)
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float3 _VignetteParams1;
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// x: Intensity (强度)
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// y: Smoothness (柔和度)
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// z: Roundness (圆度)
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float4 _VignetteCenter; // xy: Center
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// 简单的伪随机噪声函数 (用于 Dithering)
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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))) * 43758.5453);
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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 = _VignetteParams1.x;
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float smoothness = max(0.001, _VignetteParams1.y);
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float roundness = _VignetteParams1.z;
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float2 center = _VignetteCenter.xy;
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half3 colInner = _ColorInner.rgb;
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half3 colOuter = _ColorOuter.rgb;
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// 2. 计算距离场 (SDF)
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float2 d = uv - center;
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// 圆度计算
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d = d * lerp(1.0, 0.5, roundness);
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float vdist = length(d);
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float boxDist = max(abs(d.x), abs(d.y));
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vdist = lerp(boxDist, vdist, roundness);
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// 3. 计算遮罩 (Mask)
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// 归一化距离，使其适配 Intensity
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float maxDist = 0.8;
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float threshold = 1.0 - intensity;
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// 计算平滑的 0-1 遮罩值
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// mask = 0 (中心区域，显示原图) -> 1 (边缘区域，显示暗角)
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float mask = smoothstep(threshold - smoothness * 0.5, threshold + smoothness * 0.5, vdist * 2.0);
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// 5. 计算最终暗角颜色 (Gradient)
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// 随着 mask 从 0 变到 1，颜色从 Inner 变到 Outer
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// 我们可以用 mask 本身作为插值系数，或者用 vdist
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// 这里用 mask 保证颜色变化与透明度变化同步
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half3 finalVignetteColor = lerp(colInner, colOuter, mask);
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// 6. 混合原图
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half4 sceneColor = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uv);
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// sceneColor * (1 - mask) + vignetteColor * mask
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// 即：Lerp(sceneColor, finalVignetteColor, mask)
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return lerp(sceneColor, half4(finalVignetteColor, 1), mask);
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}
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ENDHLSL
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Pass
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{
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Name "Advanced Vignette"
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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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}
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