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  3. FOpenGLFrontend

FOpenGLFrontend

Unreal Engine C++ API Reference > Developer > ShaderFormatOpenGL

References

   
Module ShaderFormatOpenGL
Header /Engine/Source/Developer/ShaderFormatOpenGL/Public/ShaderFormatOpenGL.h
Include #include "ShaderFormatOpenGL.h"

Syntax

class FOpenGLFrontend

Destructors

  Type Name Description
Public function Virtual    

Functions

  Type Name Description
Protected function void

BuildShaderOutput ( FShaderCompilerOutput& ShaderOutput,
const FShaderCompilerInput& ShaderInput,
const ANSICHAR* InShaderSource,
int32 SourceLen,
GLSLVersion Version
)

 Construct the final microcode from the compiled and verified shader source.
Protected function Virtual uint32

CalculateCrossCompilerFlags ( GLSLVersion Version,
const bool bFullPrecisionInPS,
const FShaderCompilerFlags& CompilerFlags
)

  
Protected function void

CompileOffline ( const FShaderCompilerInput& ShaderInput,
FShaderCompilerOutput& Output,
const GLSLVersion ShaderVersion,
const ANSICHAR* InShaderSource
)

  
Public function void

CompileShader ( const FShaderCompilerInput& Input,
FShaderCompilerOutput& Output,
const FString& WorkingDirectory,
GLSLVersion Version
)

 Compile a shader for OpenGL on Windows.
Protected function Virtual void

ConvertOpenGLVersionFromGLSLVersion ( GLSLVersion InVersion,
int& OutMajorVersion,
int& OutMinorVersion
)

  
Protected function Virtual FGlslCodeBackend *

CreateBackend ( GLSLVersion Version,
uint32 CCFlags,
EHlslCompileTarget HlslCompilerTarget
)

 Create the compiling backend
Protected function Virtual FGlslLanguageSpec *

CreateLanguageSpec ( GLSLVersion Version,
bool bDefaultPrecisionIsHalf
)

 Create the language spec
Protected function Const void

FillDeviceCapsOfflineCompilation ( FDeviceCapabilities& Caps,
const GLSLVersion ShaderVersion
)

 Fills device capabilities in 'offline', mostly hardcoded values
Protected function Virtual uint32 What is the max number of samplers the shader platform can use?
Protected function Virtual bool

IsSM5 ( GLSLVersion Version
)

  
Protected function Virtual bool Allow subclass to write out different output, returning true if it did write everything it needed
Protected function Virtual bool If true, the shader output map will contain true names (i.e. ColorModifier) instead of helper names for runtime binding (i.e. pb_5)
Protected function void

PlatformCompileOffline ( const FShaderCompilerInput& Input,
FShaderCompilerOutput& ShaderOutput,
const ANSICHAR* ShaderSource,
const GLSLVersion ShaderVersion
)

 Based on ShaderVersion decides what platform specific compiler to use
Protected function Const bool  
Protected function Virtual bool

PostProcessShaderSource ( GLSLVersion Version,
EShaderFrequency Frequency,
const ANSICHAR* ShaderSource,
uint32 SourceLen,
FShaderParameterMap& ParameterMap,
TMap< FString, FString >& BindingNameMap,
TArray< struct FShaderCompilerError >& Errors,
const FShaderCompilerInput& ShaderInput
)

 Allow a subclass to perform additional work on the cross compiled source code.
Protected function void

PrecompileShader ( FShaderCompilerOutput& ShaderOutput,
const FShaderCompilerInput& ShaderInput,
const ANSICHAR* ShaderSource,
GLSLVersion Version,
EHlslShaderFrequency Frequency
)

 Precompile a GLSL shader.
Protected function Const TSharedPtr< ANSICHAR >

PrepareCodeForOfflineCompilation ( GLSLVersion ShaderVersion,
EShaderFrequency Frequency,
const ANSICHAR* InShaderSource
)

 Final source code processing, based on device capabilities, before actual (offline) compilation; it mostly mirrors the behaviour of OpenGLShaders.cpp/GLSLToDeviceCompatibleGLSL()
Protected function Virtual void

SetupPerVersionCompilationEnvironment ( GLSLVersion Version,
FShaderCompilerDefinitions& AdditionalDefines,
EHlslCompileTarget& HlslCompilerTarget
)

 Set up compilation information like defines and HlslCompileTarget

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