ue 后效里宏的设置

shader model以外的宏的设置

	static inline void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment)
	{
		FGlobalShader::ModifyCompilationEnvironment(Parameters, OutEnvironment);

		OutEnvironment.SetDefine(TEXT("THREADGROUPSIZE_X"), ThreadGroupSizeX);
		OutEnvironment.SetDefine(TEXT("THREADGROUPSIZE_Y"), ThreadGroupSizeY);
		OutEnvironment.SetDefine(TEXT("THREADGROUPSIZE_Z"), ThreadGroupSizeZ);
		OutEnvironment.SetDefine(TEXT("SRC_TYPE"), uint32(SrcType));
		OutEnvironment.SetDefine(TEXT("DST_TYPE"), uint32(DstType));

		switch (ValueType)
		{
		case ECopyTextureValueType::Float:
			switch (NumChannels)
			{
			case 1: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("float"));  break;
			case 2: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("float2")); break;
			case 3: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("float3")); break;
			case 4: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("float4")); break;
			}
			break;

		case ECopyTextureValueType::Int32:
			switch (NumChannels)
			{
			case 1: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("int"));  break;
			case 2: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("int2")); break;
			case 3: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("int3")); break;
			case 4: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("int4")); break;
			}
			break;

		case ECopyTextureValueType::Uint32:
			switch (NumChannels)
			{
			case 1: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("uint"));  break;
			case 2: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("uint2")); break;
			case 3: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("uint3")); break;
			case 4: OutEnvironment.SetDefine(TEXT("VALUE_TYPE"), TEXT("uint4")); break;
			}
			break;
		}
	}

　　

	static void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment)
	{
		FGlobalShader::ModifyCompilationEnvironment(Parameters, OutEnvironment);
		CA_SUPPRESS(6313);
		OutEnvironment.SetDefine(TEXT("ES2_USE_BLOOM"), (UseSunBloom & 1) ? (uint32)1 : (uint32)0);
		OutEnvironment.SetDefine(TEXT("ES2_USE_SUN"), (UseSunBloom >> 1) ? (uint32)1 : (uint32)0);
	}

　　

开都可以这么开

static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters)

这个函数还没理解好 有待理解

这是用的时候 usf里

1

[numthreads(THREADGROUPSIZE_X, THREADGROUPSIZE_Y, THREADGROUPSIZE_Z)]

2

#elif DST_TYPE == 2

RWTexture3D <VALUE_TYPE> DstResource;
#define DST_ADDR(p,o) ((p).xyz + (o).xyz)

#endif

3

#if ES2_USE_BLOOM

#endif