/**
* Preprocess a shader.
* @param OutPreprocessedShader - Upon return contains the preprocessed source code.
* @param ShaderOutput - ShaderOutput to which errors can be added.
* @param ShaderInput - The shader compiler input.
* @param AdditionalDefines - Additional defines with which to preprocess the shader.
* @returns true if the shader is preprocessed without error.
*/
bool PreprocessShaderFile(FString& OutPreprocessedShader, TArray<FShaderCompilerError>& OutShaderErrors, const FString& InShaderFile)
{
FString McppOptions;
FString McppOutput, McppErrors;
ANSICHAR* McppOutAnsi = nullptr;
ANSICHAR* McppErrAnsi = nullptr;
bool bSuccess = false;
// MCPP is not threadsafe.
static FCriticalSection McppCriticalSection;
FScopeLock McppLock(&McppCriticalSection);
FSimpleMcppFileLoader FileLoader(InShaderFile);
int32 Result = mcpp_run(
TCHAR_TO_ANSI(*McppOptions),
TCHAR_TO_ANSI(*FileLoader.GetInputShaderFilename()),
&McppOutAnsi,
&McppErrAnsi,
FileLoader.GetMcppInterface()
);
McppOutput = McppOutAnsi;
McppErrors = McppErrAnsi;
if (ParseMcppErrors(OutShaderErrors, McppErrors, false))
{
// exchange strings
FMemory::Memswap( &OutPreprocessedShader, &McppOutput, sizeof(FString) );
bSuccess = true;
}
return bSuccess;
}
/**
* Preprocess a shader.
* @param OutPreprocessedShader - Upon return contains the preprocessed source code.
* @param ShaderOutput - ShaderOutput to which errors can be added.
* @param ShaderInput - The shader compiler input.
* @param AdditionalDefines - Additional defines with which to preprocess the shader.
* @returns true if the shader is preprocessed without error.
*/
bool PreprocessShader(
FString& OutPreprocessedShader,
FShaderCompilerOutput& ShaderOutput,
const FShaderCompilerInput& ShaderInput,
const FShaderCompilerDefinitions& AdditionalDefines
)
{
FString McppOptions;
FString McppOutput, McppErrors;
ANSICHAR* McppOutAnsi = NULL;
ANSICHAR* McppErrAnsi = NULL;
bool bSuccess = false;
// MCPP is not threadsafe.
static FCriticalSection McppCriticalSection;
FScopeLock McppLock(&McppCriticalSection);
FMcppFileLoader FileLoader(ShaderInput);
AddMcppDefines(McppOptions, ShaderInput.Environment.GetDefinitions());
AddMcppDefines(McppOptions, AdditionalDefines.GetDefinitionMap());
int32 Result = mcpp_run(
TCHAR_TO_ANSI(*McppOptions),
TCHAR_TO_ANSI(*FileLoader.GetInputShaderFilename()),
&McppOutAnsi,
&McppErrAnsi,
FileLoader.GetMcppInterface()
);
McppOutput = McppOutAnsi;
McppErrors = McppErrAnsi;
if (ParseMcppErrors(ShaderOutput, McppErrors))
{
// exchange strings
FMemory::Memswap( &OutPreprocessedShader, &McppOutput, sizeof(FString) );
bSuccess = true;
}
return bSuccess;
}
