738 lines
28 KiB
Markdown
738 lines
28 KiB
Markdown
# Common
|
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## Common.ush
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添加结构体，主要用在材质的CustomNode里。
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```c++
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// Used by toon shading.
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// Define a global custom data structure which can be filled by Custom node in material BP.
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struct FToonShadingPerMaterialCustomData
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{
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// Toon specular
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float3 ToonSpecularColor;
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float ToonSpecularLocation;
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float ToonSpecularSmoothness;
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// Toon shadow
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float3 ToonShadowColor;
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float ToonShadowLocation;
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float ToonShadowSmoothness;
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float ToonForceShadow;
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// Toon secondary shadow
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float3 ToonSecondaryShadowColor;
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float ToonSecondaryShadowLocation;
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float ToonSecondaryShadowSmoothness;
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// custom data, usually not used
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float4 CustomData0;
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float4 CustomData1;
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float4 CustomData2;
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float4 CustomData3;
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};
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static FToonShadingPerMaterialCustomData ToonShadingPerMaterialCustomData;
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```
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## DeferredShadingCommon.ush
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1. 实现[[#Encode/Decode函数]]
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2. HasCustomGBufferData()函数添加对应的ToonShadingModel宏判断
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3. [[#FGBufferData新增变量]]
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4. [[#Encode/Decode GBufferData新增逻辑]]
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1. Metallic/Specualr/Roughness => ToonShadowLocation/ToonForceShadow/ToonShadowSmoothness
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2. AO => ToonSecondaryShadowLocation
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3. CustomData => ToonShadowColor/ToonSecondaryShadowSmoothness
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4. PrecomputedShadowFactors => ToonSecondaryShadowColor
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5. `#define GBUFFER_REFACTOR 0` 以此关闭自动生成Encode/Decode GBufferData代码，并使用硬编码调用Encode/Decode GBufferData。
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6. `#if WRITES_VELOCITY_TO_GBUFFER` => `#if GBUFFER_HAS_VELOCITY`，以此**关闭写入VELOCITY到GBuffer中**。
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### Encode/Decode函数
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RGB655 to 8-bit RGB。
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将R 256 => 64 ,GB 256 => 32。之后使用2个8bit浮点来存储：通道1存储R与G的头两位；通道2存储G的后3位与B。
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```c++
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float2 EncodeColorToRGB655(float3 Color)
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{
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const uint ChannelR = (1 << 6) - 1;
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const uint ChannelG = (1 << 5) - 1;
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const uint ChannelB = (1 << 5) - 1;
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uint3 RoundedColor = uint3(float3(
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round(Color.r * ChannelR),
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round(Color.g * ChannelG),
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round(Color.b * ChannelB)
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));
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return float2(
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(RoundedColor.r << 2 | RoundedColor.g >> 3) / 255.0,
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(RoundedColor.g << 5 | RoundedColor.b ) / 255.0
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);
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}
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float3 DecodeRGB655ToColor(float2 RGB655)
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{
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const uint ChannelR = (1 << 6) - 1;
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const uint ChannelG = (1 << 5) - 1;
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const uint ChannelB = (1 << 5) - 1;
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uint2 Inputs = uint2(round(RGB655 * 255.0));
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uint BitBuffer = (Inputs.x << 8) | Inputs.y;
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uint R = (BitBuffer & 0xFC00) >> 10;
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uint G = (BitBuffer & 0x03E0) >> 5;
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uint B = (BitBuffer & 0x001F);
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return float3(R, G, B) * float3(1.0 / ChannelR, 1.0 / ChannelG, 1.0 / ChannelB);
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}
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```
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### FGBufferData新增变量
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```c++
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struct FGBufferData
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{
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...
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// Toon specular
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// 0..1, specular color
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half3 ToonSpecularColor;
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// 0..1, specular edge position
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half ToonSpecularLocation;
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// 0..1, specular edge smoothness
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half ToonSpecularSmoothness;
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// Toon shadow
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// 0..1, shadow color
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half3 ToonShadowColor;
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// 0..1, shadow egde location
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half ToonShadowLocation;
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// 0..1, shadow edge smoothness
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half ToonShadowSmoothness;
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// 0..1, force shadow
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half ToonForceShadow;
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// Toon secondary shadow
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// 0..1, secondary shadow color
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float3 ToonSecondaryShadowColor;
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// 0..1, secondary shadow edge location
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float ToonSecondaryShadowLocation;
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// 0..1, secondary shadow edge smoothness
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float ToonSecondaryShadowSmoothness;
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// Toon render
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half3 ToonCalcShadowColor;
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};
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```
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### Encode/Decode GBufferData新增逻辑
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```c++
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void EncodeGBuffer(
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FGBufferData GBuffer,
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out float4 OutGBufferA,
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out float4 OutGBufferB,
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out float4 OutGBufferC,
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out float4 OutGBufferD,
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out float4 OutGBufferE,
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out float4 OutGBufferVelocity,
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float QuantizationBias = 0 // -0.5 to 0.5 random float. Used to bias quantization.
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)
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{
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...
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switch(GBuffer.ShadingModelID)
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{
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case SHADINGMODELID_TOON_BASE:
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OutGBufferB.r = ToonShadingPerMaterialCustomData.ToonShadowLocation;
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OutGBufferB.g = ToonShadingPerMaterialCustomData.ToonForceShadow;
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OutGBufferB.b = ToonShadingPerMaterialCustomData.ToonShadowSmoothness;
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OutGBufferC.a = ToonShadingPerMaterialCustomData.ToonSecondaryShadowLocation;
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OutGBufferD.a = ToonShadingPerMaterialCustomData.ToonSecondaryShadowSmoothness;
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OutGBufferD.rgb = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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OutGBufferE.gba = ToonShadingPerMaterialCustomData.ToonSecondaryShadowColor.rgb;
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break;
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case SHADINGMODELID_TOON_PBR:
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OutGBufferB.g = ToonShadingPerMaterialCustomData.ToonShadowLocation;
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OutGBufferD.a = ToonShadingPerMaterialCustomData.ToonShadowSmoothness;
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OutGBufferD.rgb = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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OutGBufferE.gba = ToonShadingPerMaterialCustomData.ToonSpecularColor.rgb;
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break;
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case SHADINGMODELID_TOON_SKIN:
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OutGBufferB.r = ToonShadingPerMaterialCustomData.ToonShadowLocation;
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OutGBufferD.a = ToonShadingPerMaterialCustomData.ToonShadowSmoothness;
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OutGBufferD.rgb = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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break;
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default:
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break;
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}
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...
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}
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FGBufferData DecodeGBufferData(
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float4 InGBufferA,
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float4 InGBufferB,
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float4 InGBufferC,
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float4 InGBufferD,
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float4 InGBufferE,
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float4 InGBufferF,
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float4 InGBufferVelocity,
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float CustomNativeDepth,
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uint CustomStencil,
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float SceneDepth,
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bool bGetNormalizedNormal,
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bool bChecker)
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{
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FGBufferData GBuffer = (FGBufferData)0;
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...
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switch(GBuffer.ShadingModelID)
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{
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case SHADINGMODELID_TOON_BASE:
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GBuffer.ToonShadowColor = InGBufferD.rgb;
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GBuffer.ToonShadowLocation = InGBufferB.r;
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GBuffer.ToonShadowSmoothness = InGBufferB.b;
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GBuffer.ToonForceShadow = InGBufferB.g;
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GBuffer.ToonSecondaryShadowColor = InGBufferE.gba;
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GBuffer.ToonSecondaryShadowLocation = InGBufferC.a;
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GBuffer.ToonSecondaryShadowSmoothness = InGBufferD.a;
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GBuffer.Metallic = 0.0;
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GBuffer.Specular = 1.0;
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GBuffer.Roughness = 1.0;
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GBuffer.GBufferAO = 0.0;
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GBuffer.IndirectIrradiance = 1.0;
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GBuffer.PrecomputedShadowFactors = !(GBuffer.SelectiveOutputMask & SKIP_PRECSHADOW_MASK) ? float4(InGBufferE.r, 1.0, 1.0, 1.0) : ((GBuffer.SelectiveOutputMask & ZERO_PRECSHADOW_MASK) ? 0 : 1);
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GBuffer.StoredMetallic = 0.0;
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GBuffer.StoredSpecular = 1.0;
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break;
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case SHADINGMODELID_TOON_PBR:
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GBuffer.ToonSpecularColor = InGBufferE.gba;
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GBuffer.ToonShadowColor = InGBufferD.rgb;
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GBuffer.ToonShadowLocation = InGBufferB.g;
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GBuffer.ToonShadowSmoothness = InGBufferD.a;
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GBuffer.ToonSecondaryShadowColor = GBuffer.ToonShadowColor;
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GBuffer.ToonForceShadow = 1.0;
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GBuffer.ToonSpecularLocation = 1.0;
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GBuffer.Specular = 1.0;
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GBuffer.PrecomputedShadowFactors = !(GBuffer.SelectiveOutputMask & SKIP_PRECSHADOW_MASK) ? float4(InGBufferE.r, 1.0, 1.0, 1.0) : ((GBuffer.SelectiveOutputMask & ZERO_PRECSHADOW_MASK) ? 0 : 1);
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break;
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case SHADINGMODELID_TOON_SKIN:
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GBuffer.ToonShadowColor = InGBufferD.rgb;
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GBuffer.ToonShadowLocation = InGBufferB.r;
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GBuffer.ToonShadowSmoothness = InGBufferD.a;
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GBuffer.ToonSecondaryShadowColor = GBuffer.ToonShadowColor;
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GBuffer.ToonForceShadow = 1.0;
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GBuffer.Metallic = 0.0;
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GBuffer.StoredMetallic = 0.0;
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GBuffer.PrecomputedShadowFactors = !(GBuffer.SelectiveOutputMask & SKIP_PRECSHADOW_MASK) ? float4(InGBufferE.r, 1.0, 1.0, 1.0) : ((GBuffer.SelectiveOutputMask & ZERO_PRECSHADOW_MASK) ? 0 : 1);
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break;
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default:
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break;
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}
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...
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};
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```
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# BasePass
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BasePassPixelShader.usf
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1. `#if 1` => `#if GBUFFER_REFACTOR && 0`，以此关闭自动生成Encode/Decode GBufferData代码，并使用硬编码调用Encode/Decode GBufferData。
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2. 在FPixelShaderInOut_MainPS()中添加写入FGBufferData逻辑。代码如下：
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```c++
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...
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switch(GBuffer.ShadingModelID)
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{
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case SHADINGMODELID_TOON_BASE:
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GBuffer.ToonShadowColor = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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GBuffer.ToonShadowLocation = ToonShadingPerMaterialCustomData.ToonShadowLocation;
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GBuffer.ToonShadowSmoothness = ToonShadingPerMaterialCustomData.ToonShadowSmoothness;
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GBuffer.ToonForceShadow = ToonShadingPerMaterialCustomData.ToonForceShadow;
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GBuffer.ToonSecondaryShadowColor = ToonShadingPerMaterialCustomData.ToonSecondaryShadowColor.rgb;
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GBuffer.ToonSecondaryShadowLocation = ToonShadingPerMaterialCustomData.ToonSecondaryShadowLocation;
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GBuffer.ToonSecondaryShadowSmoothness = ToonShadingPerMaterialCustomData.ToonSecondaryShadowSmoothness;
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GBuffer.Specular = 1.0;
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GBuffer.GBufferAO = 0.0;
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GBuffer.PrecomputedShadowFactors.gba = 1;
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break;
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case SHADINGMODELID_TOON_PBR:
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GBuffer.ToonSpecularColor = ToonShadingPerMaterialCustomData.ToonSpecularColor.rgb;
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GBuffer.ToonShadowColor = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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GBuffer.ToonShadowLocation = ToonShadingPerMaterialCustomData.ToonShadowLocation;
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GBuffer.ToonShadowSmoothness = ToonShadingPerMaterialCustomData.ToonShadowSmoothness;
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GBuffer.ToonSecondaryShadowColor = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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GBuffer.ToonForceShadow = 1.0;
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GBuffer.Specular = 1.0;
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GBuffer.PrecomputedShadowFactors.gba = 1;
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break;
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case SHADINGMODELID_TOON_SKIN:
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GBuffer.ToonShadowColor = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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GBuffer.ToonShadowLocation = ToonShadingPerMaterialCustomData.ToonShadowLocation;
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GBuffer.ToonShadowSmoothness = ToonShadingPerMaterialCustomData.ToonShadowSmoothness;
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GBuffer.ToonSecondaryShadowColor = ToonShadingPerMaterialCustomData.ToonShadowColor.rgb;
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GBuffer.ToonForceShadow = 1.0;
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GBuffer.PrecomputedShadowFactors.g = 1;
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break;
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default:
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break;
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}
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...
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||
```
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# Lighting
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## ShadingModels
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### ShadingCommon.ush
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**添加ShadingModelID宏**：
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- SHADINGMODELID_TOON_BASE 13
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- SHADINGMODELID_TOON_PBR 14
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- SHADINGMODELID_TOON_SKIN 15
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- SHADINGMODELID_NUM 16
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判断是否是IsToonShadingModel:
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```c++
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bool IsToonShadingModel(uint ShadingModel)
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{
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uint4 ToonShadingModels = uint4(SHADINGMODELID_TOON_BASE, SHADINGMODELID_TOON_PBR, SHADINGMODELID_TOON_SKIN, 0xFF);
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return any(ShadingModel.xxxx == ToonShadingModels);
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}
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```
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## DeferredLightingCommon.ush
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修改了AccumulateDynamicLighting()的逻辑。
|
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```c++
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FLightAccumulator AccumulateDynamicLighting(
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float3 TranslatedWorldPosition, half3 CameraVector, FGBufferData GBuffer, half AmbientOcclusion, uint ShadingModelID,
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FDeferredLightData LightData, half4 LightAttenuation, float Dither, uint2 SVPos,
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inout float SurfaceShadow)
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{
|
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FLightAccumulator LightAccumulator = (FLightAccumulator)0;
|
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half3 V = -CameraVector;
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half3 N = GBuffer.WorldNormal;
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BRANCH if( GBuffer.ShadingModelID == SHADINGMODELID_CLEAR_COAT && CLEAR_COAT_BOTTOM_NORMAL)
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{
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const float2 oct1 = ((float2(GBuffer.CustomData.a, GBuffer.CustomData.z) * 4) - (512.0/255.0)) + UnitVectorToOctahedron(GBuffer.WorldNormal);
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N = OctahedronToUnitVector(oct1);
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}
|
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float3 L = LightData.Direction; // Already normalized
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float3 ToLight = L;
|
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float3 MaskedLightColor = LightData.Color;
|
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float LightMask = 1;
|
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if (LightData.bRadialLight)
|
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{
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LightMask = GetLocalLightAttenuation( TranslatedWorldPosition, LightData, ToLight, L );
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MaskedLightColor *= LightMask;
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}
|
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|
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LightAccumulator.EstimatedCost += 0.3f; // running the PixelShader at all has a cost
|
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|
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BRANCH
|
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if( LightMask > 0 )
|
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{
|
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FShadowTerms Shadow;
|
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Shadow.SurfaceShadow = AmbientOcclusion;
|
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Shadow.TransmissionShadow = 1;
|
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Shadow.TransmissionThickness = 1;
|
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Shadow.HairTransmittance.OpaqueVisibility = 1;
|
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const float ContactShadowOpacity = GBuffer.CustomData.a;
|
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GetShadowTerms(GBuffer.Depth, GBuffer.PrecomputedShadowFactors, GBuffer.ShadingModelID, ContactShadowOpacity,
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LightData, TranslatedWorldPosition, L, LightAttenuation, Dither, Shadow);
|
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SurfaceShadow = Shadow.SurfaceShadow;
|
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|
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LightAccumulator.EstimatedCost += 0.3f; // add the cost of getting the shadow terms
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|
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#if SHADING_PATH_MOBILE
|
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const bool bNeedsSeparateSubsurfaceLightAccumulation = UseSubsurfaceProfile(GBuffer.ShadingModelID);
|
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|
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FDirectLighting Lighting = (FDirectLighting)0;
|
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|
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half NoL = max(0, dot(GBuffer.WorldNormal, L));
|
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#if TRANSLUCENCY_NON_DIRECTIONAL
|
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NoL = 1.0f;
|
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#endif
|
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Lighting = EvaluateBxDF(GBuffer, N, V, L, NoL, Shadow);
|
||
|
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Lighting.Specular *= LightData.SpecularScale;
|
||
|
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LightAccumulator_AddSplit( LightAccumulator, Lighting.Diffuse, Lighting.Specular, Lighting.Diffuse, MaskedLightColor * Shadow.SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation );
|
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LightAccumulator_AddSplit( LightAccumulator, Lighting.Transmission, 0.0f, Lighting.Transmission, MaskedLightColor * Shadow.TransmissionShadow, bNeedsSeparateSubsurfaceLightAccumulation );
|
||
#else // SHADING_PATH_MOBILE
|
||
//修改了这里
|
||
bool UseToonShadow = IsToonShadingModel(GBuffer.ShadingModelID);
|
||
BRANCH
|
||
if( Shadow.SurfaceShadow + Shadow.TransmissionShadow > 0 || UseToonShadow)//修改结束
|
||
{
|
||
const bool bNeedsSeparateSubsurfaceLightAccumulation = UseSubsurfaceProfile(GBuffer.ShadingModelID);
|
||
//修改了这里
|
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BRANCH
|
||
if(UseToonShadow)
|
||
{
|
||
float NoL = dot(N, L);
|
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float ToonNoL = min(NoL, GBuffer.ToonForceShadow);
|
||
//合并SurfaceShadow以及Transmision Shadow
|
||
Shadow.SurfaceShadow = min(Shadow.SurfaceShadow, Shadow.TransmissionShadow);
|
||
|
||
//根据ToonShadowSmoothness、ToonShadowLocation、NoL计算阴影亮度，最后计算主阴影颜色。
|
||
float RangeHalf = GBuffer.ToonShadowSmoothness * 0.5;
|
||
float RangeMin = max(0.0, GBuffer.ToonShadowLocation - RangeHalf);
|
||
float RangeMax = min(1.0, GBuffer.ToonShadowLocation + RangeHalf);
|
||
float ShadowIntensity = Shadow.SurfaceShadow * smoothstep(RangeMin, RangeMax, ToonNoL);
|
||
GBuffer.ToonCalcShadowColor = lerp(GBuffer.ToonShadowColor * LightData.SpecularScale, (1.0).xxx, ShadowIntensity);
|
||
|
||
//计算次级阴影颜色，并最终合成。
|
||
RangeHalf = GBuffer.ToonSecondaryShadowSmoothness * 0.5;
|
||
RangeMin = max(0.0, GBuffer.ToonSecondaryShadowLocation - RangeHalf);
|
||
RangeMax = min(1.0, GBuffer.ToonSecondaryShadowLocation + RangeHalf);
|
||
ShadowIntensity = Shadow.SurfaceShadow * smoothstep(RangeMin, RangeMax, ToonNoL);
|
||
GBuffer.ToonCalcShadowColor = lerp(GBuffer.ToonSecondaryShadowColor * LightData.SpecularScale, GBuffer.ToonCalcShadowColor, ShadowIntensity);
|
||
}
|
||
//修改结束
|
||
|
||
#if NON_DIRECTIONAL_DIRECT_LIGHTING
|
||
float Lighting;
|
||
|
||
if( LightData.bRectLight )
|
||
{
|
||
FRect Rect = GetRect( ToLight, LightData );
|
||
|
||
Lighting = IntegrateLight( Rect );
|
||
}
|
||
else
|
||
{
|
||
FCapsuleLight Capsule = GetCapsule( ToLight, LightData );
|
||
|
||
Lighting = IntegrateLight( Capsule, LightData.bInverseSquared );
|
||
}
|
||
|
||
float3 LightingDiffuse = Diffuse_Lambert( GBuffer.DiffuseColor ) * Lighting;
|
||
LightAccumulator_AddSplit(LightAccumulator, LightingDiffuse, 0.0f, 0, MaskedLightColor * Shadow.SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation);
|
||
#else
|
||
FDirectLighting Lighting;
|
||
|
||
if (LightData.bRectLight)
|
||
{
|
||
FRect Rect = GetRect( ToLight, LightData );
|
||
const FRectTexture SourceTexture = ConvertToRectTexture(LightData);
|
||
|
||
#if REFERENCE_QUALITY
|
||
Lighting = IntegrateBxDF( GBuffer, N, V, Rect, Shadow, SourceTexture, SVPos );
|
||
#else
|
||
Lighting = IntegrateBxDF( GBuffer, N, V, Rect, Shadow, SourceTexture);
|
||
#endif
|
||
}
|
||
else
|
||
{
|
||
FCapsuleLight Capsule = GetCapsule( ToLight, LightData );
|
||
|
||
#if REFERENCE_QUALITY
|
||
Lighting = IntegrateBxDF( GBuffer, N, V, Capsule, Shadow, SVPos );
|
||
#else
|
||
Lighting = IntegrateBxDF( GBuffer, N, V, Capsule, Shadow, LightData.bInverseSquared );
|
||
#endif
|
||
}
|
||
//修改了这里
|
||
float SurfaceShadow = UseToonShadow ? 1.0 : Shadow.SurfaceShadow;
|
||
float TransmissionShadow = UseToonShadow ? 1.0 : Shadow.TransmissionShadow;
|
||
Lighting.Specular *= UseToonShadow ? GBuffer.ToonSpecularColor : LightData.SpecularScale;
|
||
|
||
LightAccumulator_AddSplit( LightAccumulator, Lighting.Diffuse, Lighting.Specular, Lighting.Diffuse, MaskedLightColor * SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation );
|
||
LightAccumulator_AddSplit( LightAccumulator, Lighting.Transmission, 0.0f, Lighting.Transmission, MaskedLightColor * TransmissionShadow, bNeedsSeparateSubsurfaceLightAccumulation );
|
||
//修改结束
|
||
LightAccumulator.EstimatedCost += 0.4f; // add the cost of the lighting computations (should sum up to 1 form one light)
|
||
#endif
|
||
}
|
||
#endif // SHADING_PATH_MOBILE
|
||
}
|
||
return LightAccumulator;
|
||
}
|
||
```
|
||
|
||
## ShadingModels.ush
|
||
```c++
|
||
float3 ToonSpecular(float ToonSpecularLocation, float ToonSpecularSmoothness, float3 ToonSpecularColor, float NoL)
|
||
{
|
||
float ToonSpecularRangeHalf = ToonSpecularSmoothness * 0.5;
|
||
float ToonSpecularRangeMin = ToonSpecularLocation - ToonSpecularRangeHalf;
|
||
float ToonSpecularRangeMax = ToonSpecularLocation + ToonSpecularRangeHalf;
|
||
return smoothstep(ToonSpecularRangeMin, ToonSpecularRangeMax, NoL) * ToonSpecularColor;
|
||
}
|
||
```
|
||
|
||
创建了ToonCustomBxDF（**SHADINGMODELID_TOON_BASE**）与ToonLitBxDF（**SHADINGMODELID_TOON_PBR**、**SHADINGMODELID_TOON_SKIN**）2个ShadingModel函数。
|
||
|
||
### ToonCustomBxDF的修改
|
||
Diffuse里面乘以之前在DeferredShadingCommon.ush中计算好的ShadowColor（已经计算了NoL）
|
||
`Lighting.Diffuse *= AreaLight.FalloffColor * (Falloff * NoL);`
|
||
=>
|
||
`Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;`
|
||
|
||
Speuclar直接归零，具体是在BasePass阶段进行计算了。
|
||
`Lighting.Specular = 0；`
|
||
### ToonLitBxDF的修改
|
||
Diffuse里面乘以之前在DeferredShadingCommon.ush中计算好的ShadowColor（已经计算了NoL）
|
||
`Lighting.Diffuse *= AreaLight.FalloffColor * (Falloff * NoL);`
|
||
=>
|
||
`Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;`
|
||
|
||
Speuclar最后乘以了**Shadow.SurfaceShadow**
|
||
`Lighting.Specular *= Shadow.SurfaceShadow;`
|
||
|
||
|
||
|
||
```c++
|
||
|
||
FDirectLighting ToonLitBxDF( FGBufferData GBuffer, half3 N, half3 V, half3 L, float Falloff, half NoL, FAreaLight AreaLight, FShadowTerms Shadow )
|
||
{
|
||
BxDFContext Context;
|
||
FDirectLighting Lighting;
|
||
|
||
#if SUPPORTS_ANISOTROPIC_MATERIALS
|
||
bool bHasAnisotropy = HasAnisotropy(GBuffer.SelectiveOutputMask);
|
||
#else
|
||
bool bHasAnisotropy = false;
|
||
#endif
|
||
|
||
float NoV, VoH, NoH;
|
||
BRANCH
|
||
if (bHasAnisotropy)
|
||
{
|
||
half3 X = GBuffer.WorldTangent;
|
||
half3 Y = normalize(cross(N, X));
|
||
Init(Context, N, X, Y, V, L);
|
||
|
||
NoV = Context.NoV;
|
||
VoH = Context.VoH;
|
||
NoH = Context.NoH;
|
||
}
|
||
else
|
||
{
|
||
#if SHADING_PATH_MOBILE
|
||
InitMobile(Context, N, V, L, NoL);
|
||
#else
|
||
Init(Context, N, V, L);
|
||
#endif
|
||
|
||
NoV = Context.NoV;
|
||
VoH = Context.VoH;
|
||
NoH = Context.NoH;
|
||
|
||
SphereMaxNoH(Context, AreaLight.SphereSinAlpha, true);
|
||
}
|
||
|
||
Context.NoV = saturate(abs( Context.NoV ) + 1e-5);
|
||
|
||
#if MATERIAL_ROUGHDIFFUSE
|
||
// Chan diffuse model with roughness == specular roughness. This is not necessarily a good modelisation of reality because when the mean free path is super small, the diffuse can in fact looks rougher. But this is a start.
|
||
// Also we cannot use the morphed context maximising NoH as this is causing visual artefact when interpolating rough/smooth diffuse response.
|
||
Lighting.Diffuse = Diffuse_Chan(GBuffer.DiffuseColor, Pow4(GBuffer.Roughness), NoV, NoL, VoH, NoH, GetAreaLightDiffuseMicroReflWeight(AreaLight));
|
||
#else
|
||
Lighting.Diffuse = Diffuse_Lambert(GBuffer.DiffuseColor);
|
||
#endif
|
||
// Toon Diffuse
|
||
Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;
|
||
|
||
BRANCH
|
||
if (bHasAnisotropy)
|
||
{
|
||
//Lighting.Specular = GBuffer.WorldTangent * .5f + .5f;
|
||
Lighting.Specular = AreaLight.FalloffColor * (Falloff * NoL) * SpecularGGX(GBuffer.Roughness, GBuffer.Anisotropy, GBuffer.SpecularColor, Context, NoL, AreaLight);
|
||
}
|
||
else
|
||
{
|
||
if( IsRectLight(AreaLight) )
|
||
{
|
||
Lighting.Specular = RectGGXApproxLTC(GBuffer.Roughness, GBuffer.SpecularColor, N, V, AreaLight.Rect, AreaLight.Texture);
|
||
}
|
||
else
|
||
{
|
||
// Toon specular
|
||
Lighting.Specular = AreaLight.FalloffColor * (Falloff * NoL) * SpecularGGX(GBuffer.Roughness, GBuffer.SpecularColor, Context, NoL, AreaLight);
|
||
}
|
||
}
|
||
Lighting.Specular *= Shadow.SurfaceShadow;
|
||
|
||
FBxDFEnergyTerms EnergyTerms = ComputeGGXSpecEnergyTerms(GBuffer.Roughness, Context.NoV, GBuffer.SpecularColor);
|
||
|
||
// Add energy presevation (i.e. attenuation of the specular layer onto the diffuse component
|
||
Lighting.Diffuse *= ComputeEnergyPreservation(EnergyTerms);
|
||
|
||
// Add specular microfacet multiple scattering term (energy-conservation)
|
||
Lighting.Specular *= ComputeEnergyConservation(EnergyTerms);
|
||
|
||
Lighting.Transmission = 0;
|
||
return Lighting;
|
||
}
|
||
|
||
FDirectLighting ToonCustomBxDF( FGBufferData GBuffer, half3 N, half3 V, half3 L, float Falloff, half NoL, FAreaLight AreaLight, FShadowTerms Shadow )
|
||
{
|
||
BxDFContext Context;
|
||
FDirectLighting Lighting;
|
||
|
||
float NoV, VoH, NoH;
|
||
#if SHADING_PATH_MOBILE
|
||
InitMobile(Context, N, V, L, NoL);
|
||
#else
|
||
Init(Context, N, V, L);
|
||
#endif
|
||
NoV = Context.NoV;
|
||
VoH = Context.VoH;
|
||
NoH = Context.NoH;
|
||
|
||
SphereMaxNoH(Context, AreaLight.SphereSinAlpha, true);
|
||
|
||
Context.NoV = saturate(abs( Context.NoV ) + 1e-5);
|
||
|
||
#if MATERIAL_ROUGHDIFFUSE
|
||
// Chan diffuse model with roughness == specular roughness. This is not necessarily a good modelisation of reality because when the mean free path is super small, the diffuse can in fact looks rougher. But this is a start.
|
||
// Also we cannot use the morphed context maximising NoH as this is causing visual artefact when interpolating rough/smooth diffuse response.
|
||
Lighting.Diffuse = Diffuse_Chan(GBuffer.DiffuseColor, Pow4(GBuffer.Roughness), NoV, NoL, VoH, NoH, GetAreaLightDiffuseMicroReflWeight(AreaLight));
|
||
#else
|
||
Lighting.Diffuse = Diffuse_Lambert(GBuffer.DiffuseColor);
|
||
#endif
|
||
// Toon Diffuse
|
||
Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;
|
||
|
||
// Toon specular
|
||
// Lighting.Specular = AreaLight.FalloffColor * (Falloff * NoL) * ToonSpecular(GBuffer.ToonSpecularLocation, GBuffer.ToonSpecularSmoothness, GBuffer.ToonSpecularColor, NoL);
|
||
// Lighting.Specular *= Shadow.SurfaceShadow;
|
||
|
||
// FBxDFEnergyTerms EnergyTerms = ComputeGGXSpecEnergyTerms(GBuffer.Roughness, Context.NoV, GBuffer.SpecularColor);
|
||
|
||
// Add energy presevation (i.e. attenuation of the specular layer onto the diffuse component
|
||
// Lighting.Diffuse *= ComputeEnergyPreservation(EnergyTerms);
|
||
|
||
Lighting.Specular = 0;
|
||
Lighting.Transmission = 0;
|
||
return Lighting;
|
||
}
|
||
|
||
FDirectLighting IntegrateBxDF( FGBufferData GBuffer, half3 N, half3 V, half3 L, float Falloff, half NoL, FAreaLight AreaLight, FShadowTerms Shadow )
|
||
{
|
||
switch( GBuffer.ShadingModelID )
|
||
{
|
||
case SHADINGMODELID_DEFAULT_LIT:
|
||
case SHADINGMODELID_SINGLELAYERWATER:
|
||
case SHADINGMODELID_THIN_TRANSLUCENT:
|
||
return DefaultLitBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_SUBSURFACE:
|
||
return SubsurfaceBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_PREINTEGRATED_SKIN:
|
||
return PreintegratedSkinBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_CLEAR_COAT:
|
||
return ClearCoatBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_SUBSURFACE_PROFILE:
|
||
return SubsurfaceProfileBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_TWOSIDED_FOLIAGE:
|
||
return TwoSidedBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_HAIR:
|
||
return HairBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_CLOTH:
|
||
return ClothBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_EYE:
|
||
return EyeBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_TOON_BASE:
|
||
return ToonCustomBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
case SHADINGMODELID_TOON_PBR:
|
||
case SHADINGMODELID_TOON_SKIN:
|
||
return ToonLitBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
|
||
default:
|
||
return (FDirectLighting)0;
|
||
}
|
||
}
|
||
```
|
||
|
||
## DeferredLightPixelShaders.usf
|
||
在DeferredLightPixelMain()中添加逻辑:
|
||
1. 非卡通材质正常渲染。
|
||
2. 材质材质只有在LightingChannel = 2时才会计算卡通光影效果。
|
||
```c++
|
||
bool UseToonShadow = IsToonShadingModel(ScreenSpaceData.GBuffer.ShadingModelID);
|
||
// LightingChannel Toon Shading only calculate light of LightingChannel = 2
|
||
BRANCH if (!UseToonShadow || (UseToonShadow && DeferredLightUniforms.LightingChannelMask & 0x4))
|
||
{
|
||
const float SceneDepth = CalcSceneDepth(InputParams.ScreenUV);
|
||
const FDerivedParams DerivedParams = GetDerivedParams(InputParams, SceneDepth);
|
||
|
||
FDeferredLightData LightData = InitDeferredLightFromUniforms(CURRENT_LIGHT_TYPE);
|
||
UpdateLightDataColor(LightData, InputParams, DerivedParams);
|
||
|
||
#if USE_HAIR_COMPLEX_TRANSMITTANCE
|
||
if (ScreenSpaceData.GBuffer.ShadingModelID == SHADINGMODELID_HAIR && ShouldUseHairComplexTransmittance(ScreenSpaceData.GBuffer))
|
||
{
|
||
LightData.HairTransmittance = EvaluateDualScattering(ScreenSpaceData.GBuffer, DerivedParams.CameraVector, -DeferredLightUniforms.Direction);
|
||
}
|
||
#endif
|
||
|
||
float Dither = InterleavedGradientNoise(InputParams.PixelPos, View.StateFrameIndexMod8);
|
||
|
||
float SurfaceShadow = 1.0f;
|
||
|
||
float4 LightAttenuation = GetLightAttenuationFromShadow(InputParams, SceneDepth);
|
||
float4 Radiance = GetDynamicLighting(DerivedParams.TranslatedWorldPosition, DerivedParams.CameraVector, ScreenSpaceData.GBuffer, ScreenSpaceData.AmbientOcclusion, ScreenSpaceData.GBuffer.ShadingModelID, LightData, LightAttenuation, Dither, uint2(InputParams.PixelPos), SurfaceShadow);
|
||
|
||
OutColor += Radiance;
|
||
}
|
||
```
|
||
|
||
# PostProcess
|
||
## ToneMapping
|
||
c++部分主要修改了：
|
||
1. PostProcessing.cpp
|
||
2. PostProcessTonemap.cpp
|
||
3. PostProcessTonemap.h
|
||
|
||
***实现向ToneMaper Shader传递 `TRDGUniformBufferRef<FSceneTextureUniformParameters>`的功能***
|
||
|
||
之后再PostProcessTonemap.usf中，对**CustomStencil**进行判断，如果为true，则直接返回之前渲染结果。实际上BufferVisualization里根本看不出来。
|
||
```c++
|
||
#include "DeferredShadingCommon.ush"
|
||
|
||
// pixel shader entry point
|
||
void MainPS(
|
||
in noperspective float2 UV : TEXCOORD0,
|
||
in noperspective float2 InVignette : TEXCOORD1,
|
||
in noperspective float4 GrainUV : TEXCOORD2,
|
||
in noperspective float2 ScreenPos : TEXCOORD3,
|
||
in noperspective float2 FullViewUV : TEXCOORD4,
|
||
float4 SvPosition : SV_POSITION, // after all interpolators
|
||
out float4 OutColor : SV_Target0
|
||
#if OUTPUT_LUMINANCE
|
||
, out float OutLuminance: SV_Target1
|
||
#endif
|
||
)
|
||
{
|
||
float Luminance;
|
||
FGBufferData SamplerBuffer = GetGBufferData(UV * View.ResolutionFractionAndInv.x, false);
|
||
if (SamplerBuffer.CustomStencil > 1.0f && abs(SamplerBuffer.CustomDepth - SamplerBuffer.Depth) < 1)
|
||
{
|
||
OutColor = SampleSceneColor(UV);
|
||
}
|
||
else
|
||
{
|
||
OutColor = TonemapCommonPS(UV, InVignette, GrainUV, ScreenPos, FullViewUV, SvPosition, Luminance);
|
||
}
|
||
#if OUTPUT_LUMINANCE
|
||
OutLuminance = Luminance;
|
||
#endif
|
||
}
|
||
```
|
||
|
||
## PostProcessCombineLUT.usf
|
||
主要移植了UE4版本的LUT，以此保证效果统一。
|
||
|
||
# 其他
|
||
## GpuSkinCacheComputeShader.usf
|
||
注释2行代码，用处不明。
|
||
```c++
|
||
#if GPUSKIN_MORPH_BLEND
|
||
{
|
||
Intermediates.UnpackedPosition += Unpacked.DeltaPosition;
|
||
// calc new normal by offseting it with the delta
|
||
LocalTangentZ = normalize( LocalTangentZ + Unpacked.DeltaTangentZ);
|
||
// derive the new tangent by orthonormalizing the new normal against
|
||
// the base tangent vector (assuming these are normalized)
|
||
LocalTangentX = normalize( LocalTangentX - (dot(LocalTangentX, LocalTangentZ) * LocalTangentZ) );
|
||
}#else
|
||
#if GPUSKIN_APEX_CLOTH
|
||
```
|
||
=>
|
||
```c++
|
||
#if GPUSKIN_MORPH_BLEND
|
||
{
|
||
Intermediates.UnpackedPosition += Unpacked.DeltaPosition;
|
||
// calc new normal by offseting it with the delta
|
||
//LocalTangentZ = normalize( LocalTangentZ + Unpacked.DeltaTangentZ);
|
||
// derive the new tangent by orthonormalizing the new normal against
|
||
// the base tangent vector (assuming these are normalized)
|
||
//LocalTangentX = normalize( LocalTangentX - (dot(LocalTangentX, LocalTangentZ) * LocalTangentZ) );
|
||
}#else
|
||
#if GPUSKIN_APEX_CLOTH
|
||
```
|