vault backup: 2024-06-21 11:07:35

02-Note/DAWA/ASoul/渲染方案/Shader修改部分.md

@@ -35,8 +35,84 @@ static FToonShadingPerMaterialCustomData ToonShadingPerMaterialCustomData;
 
 
 ## DeferredShadingCommon.ush
+1. 实现[[#Encode/Decode函数]]
+2. HasCustomGBufferData()函数添加对应的ToonShadingModel宏判断
+3. [[#FGBufferData新增变量]]
+4. 在Encode/Decode GBufferData中新增逻辑。
 
+### Encode/Decode函数
+RGB655 to 8-bit RGB。
+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。
 
+```c++
+float2 EncodeColorToRGB655(float3 Color)  
+{  
+    const uint ChannelR = (1 << 6) - 1;  
+    const uint ChannelG = (1 << 5) - 1;  
+    const uint ChannelB = (1 << 5) - 1;  
+  
+    uint3 RoundedColor = uint3(float3(  
+       round(Color.r * ChannelR),  
+       round(Color.g * ChannelG),  
+       round(Color.b * ChannelB)  
+    ));  
+    return float2(  
+       (RoundedColor.r << 2 | RoundedColor.g >> 3) / 255.0,  
+       (RoundedColor.g << 5 | RoundedColor.b     ) / 255.0  
+    );  
+}  
+  
+float3 DecodeRGB655ToColor(float2 RGB655)  
+{  
+    const uint ChannelR = (1 << 6) - 1;  
+    const uint ChannelG = (1 << 5) - 1;  
+    const uint ChannelB = (1 << 5) - 1;  
+  
+    uint2 Inputs = uint2(round(RGB655 * 255.0));  
+    uint BitBuffer = (Inputs.x << 8) | Inputs.y;  
+    uint R = (BitBuffer & 0xFC00) >> 10;  
+    uint G = (BitBuffer & 0x03E0) >> 5;  
+    uint B = (BitBuffer & 0x001F);  
+  
+    return float3(R, G, B) * float3(1.0 / ChannelR, 1.0 / ChannelG, 1.0 / ChannelB);  
+}
+```
+
+### FGBufferData新增变量
+```c++
+struct FGBufferData  
+{
+...
+	// Toon specular  
+	// 0..1, specular color  
+	half3 ToonSpecularColor;  
+	// 0..1, specular edge position  
+	half ToonSpecularLocation;  
+	// 0..1, specular edge smoothness  
+	half ToonSpecularSmoothness;  
+	  
+	// Toon shadow  
+	// 0..1, shadow color  
+	half3 ToonShadowColor;  
+	// 0..1, shadow egde location  
+	half ToonShadowLocation;  
+	// 0..1, shadow edge smoothness  
+	half ToonShadowSmoothness;  
+	// 0..1, force shadow  
+	half ToonForceShadow;  
+	  
+	// Toon secondary shadow  
+	// 0..1, secondary shadow color  
+	float3 ToonSecondaryShadowColor;  
+	// 0..1, secondary shadow edge location  
+	float ToonSecondaryShadowLocation;  
+	// 0..1, secondary shadow edge smoothness  
+	float ToonSecondaryShadowSmoothness;  
+	  
+	// Toon render  
+	half3 ToonCalcShadowColor;
+};
+```
 # BasePass
 BasePassPixelShader.usf