83 lines
3.7 KiB
Markdown
83 lines
3.7 KiB
Markdown
---
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title: ToonPostProcess
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date: 2024-05-15 16:50:13
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excerpt:
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tags:
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rating: ⭐
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---
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# Bloom
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Bloom主要分
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- Bloom
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- FFTBloom
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- LensFlares
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## FFTBloom
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**FBloomFindKernelCenterCS**：用于找到Bloom效果的核（Kernel）中心(纹理中找到最亮的像素)。用于在一个，并记录其位置。主要通过计算Luminance来获取到中心区域，而在这里的中心区域可以有多个，这也代表着在最终输出的SceneColor里可以有多个【曝点光晕(Bloom)效果】
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# 实用代码
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代码位于DeferredShadingCommon.ush：
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```c++
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// @param UV - UV space in the GBuffer textures (BufferSize resolution)
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FGBufferData GetGBufferData(float2 UV, bool bGetNormalizedNormal = true)
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{
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#if GBUFFER_REFACTOR
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return DecodeGBufferDataUV(UV,bGetNormalizedNormal);
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#else
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float4 GBufferA = Texture2DSampleLevel(SceneTexturesStruct.GBufferATexture, SceneTexturesStruct_GBufferATextureSampler, UV, 0);
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float4 GBufferB = Texture2DSampleLevel(SceneTexturesStruct.GBufferBTexture, SceneTexturesStruct_GBufferBTextureSampler, UV, 0);
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float4 GBufferC = Texture2DSampleLevel(SceneTexturesStruct.GBufferCTexture, SceneTexturesStruct_GBufferCTextureSampler, UV, 0);
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float4 GBufferD = Texture2DSampleLevel(SceneTexturesStruct.GBufferDTexture, SceneTexturesStruct_GBufferDTextureSampler, UV, 0);
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float CustomNativeDepth = Texture2DSampleLevel(SceneTexturesStruct.CustomDepthTexture, SceneTexturesStruct_CustomDepthTextureSampler, UV, 0).r;
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// BufferToSceneTextureScale is necessary when translucent materials are rendered in a render target
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// that has a different resolution than the scene color textures, e.g. r.SeparateTranslucencyScreenPercentage < 100.
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int2 IntUV = (int2)trunc(UV * View.BufferSizeAndInvSize.xy * View.BufferToSceneTextureScale.xy);
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uint CustomStencil = SceneTexturesStruct.CustomStencilTexture.Load(int3(IntUV, 0)) STENCIL_COMPONENT_SWIZZLE;
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#if ALLOW_STATIC_LIGHTING
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float4 GBufferE = Texture2DSampleLevel(SceneTexturesStruct.GBufferETexture, SceneTexturesStruct_GBufferETextureSampler, UV, 0);
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#else
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float4 GBufferE = 1;
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#endif
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float4 GBufferF = Texture2DSampleLevel(SceneTexturesStruct.GBufferFTexture, SceneTexturesStruct_GBufferFTextureSampler, UV, 0);
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#if WRITES_VELOCITY_TO_GBUFFER
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float4 GBufferVelocity = Texture2DSampleLevel(SceneTexturesStruct.GBufferVelocityTexture, SceneTexturesStruct_GBufferVelocityTextureSampler, UV, 0);
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#else
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float4 GBufferVelocity = 0;
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#endif
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float SceneDepth = CalcSceneDepth(UV);
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return DecodeGBufferData(GBufferA, GBufferB, GBufferC, GBufferD, GBufferE, GBufferF, GBufferVelocity, CustomNativeDepth, CustomStencil, SceneDepth, bGetNormalizedNormal, CheckerFromSceneColorUV(UV));
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#endif
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}
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// Minimal path for just the lighting model, used to branch around unlit pixels (skybox)
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uint GetShadingModelId(float2 UV)
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{
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return DecodeShadingModelId(Texture2DSampleLevel(SceneTexturesStruct.GBufferBTexture, SceneTexturesStruct_GBufferBTextureSampler, UV, 0).a);
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}
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```
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## ShadingModel判断
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```c++
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bool IsToonShadingModel(float2 UV)
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{
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uint ShadingModel = DecodeShadingModelId(Texture2DSampleLevel(SceneTexturesStruct.GBufferBTexture, SceneTexturesStruct_GBufferBTextureSampler, UV, 0).a);
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return ShadingModel == SHADINGMODELID_TOONSTANDARD
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|| ShadingModel == SHADINGMODELID_PREINTEGRATED_SKIN;
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}
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```
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PS.需要Shader添加FSceneTextureShaderParameters/FSceneTextureUniformParameters。
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```c++
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IMPLEMENT_STATIC_UNIFORM_BUFFER_STRUCT(FSceneTextureUniformParameters, "SceneTexturesStruct", SceneTextures);
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BEGIN_SHADER_PARAMETER_STRUCT(FSceneTextureShaderParameters, ENGINE_API)
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SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSceneTextureUniformParameters, SceneTextures)
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SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FMobileSceneTextureUniformParameters, MobileSceneTextures)
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END_SHADER_PARAMETER_STRUCT()
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``` |