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03-UnrealEngine/卡通渲染相关资料/渲染功能/ShaderModel/GBuffer&Material&BasePass.md

@@ -53,8 +53,6 @@ GBuffer相关信息（精度、顺序）可以参考FetchLegacyGBufferInfo()。
 	- TargetSeparatedMainDirLight(MRT7)
 
 几个动态MRT的存在条件与Shader判断宏：
-***查找IsUsingBasePassVelocity()*** 被使用过的地方。
-
 - OutGBufferE(PrecomputedShadowFactors)：r.AllowStaticLighting = 1
 	- GBUFFER_HAS_PRECSHADOWFACTOR
 	- WRITES_PRECSHADOWFACTOR_ZERO
@@ -180,6 +178,38 @@ else if (Mat.IS_BASE_PASS)
 }
 ```
 
+位于FShaderCompileUtilities::ApplyDerivedDefines()，新版本逻辑遍历数据由GBufferInfo.cpp中的FetchLegacyGBufferInfo()处理。
+```c++
+#if 1
+	static bool bTestNewVersion = true;
+	if (bTestNewVersion)
+	{
+		//if (DerivedDefines.USES_GBUFFER)
+		{
+			for (int32 Iter = 0; Iter < FGBufferInfo::MaxTargets; Iter++)
+			{
+				if (bTargetUsage[Iter])
+				{
+					FString TargetName = FString::Printf(TEXT("PIXELSHADEROUTPUT_MRT%d"), Iter);
+					OutEnvironment.SetDefine(TargetName.GetCharArray().GetData(), TEXT("1"));
+				}
+			}
+		}
+	}
+	else
+	{
+		// This uses the legacy logic from CalculateDerivedMaterialParameters(); Just keeping it around momentarily for testing during the transition.
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT0)
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT1)
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT2)
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT3)
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT4)
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT5)
+		SET_COMPILE_BOOL_IF_TRUE(PIXELSHADEROUTPUT_MRT6)
+	}
+#endif
+```
+
 ### 是否需要Toon
 在材质中：
 ```c++