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This represents UE4/Main @18073326, Release-5.0 @18081140 and Dev-PerfTest @18045971 [CL 18081471 by aurel cordonnier in ue5-release-engine-test branch]
107 lines
4.1 KiB
C++
107 lines
4.1 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "RHIDefinitions.h"
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#include "hlslcc.h"
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#if PLATFORM_WINDOWS
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#include "Windows/WindowsHWrapper.h"
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#endif
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struct FShaderCompilerInput;
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struct FShaderCompilerOutput;
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class FShaderCompilerFlags;
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enum GLSLVersion
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{
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GLSL_150_REMOVED,
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GLSL_430_REMOVED,
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GLSL_ES2_REMOVED,
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GLSL_ES2_WEBGL_REMOVED,
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GLSL_150_ES2_DEPRECATED, // ES2 Emulation
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GLSL_150_ES2_NOUB_DEPRECATED, // ES2 Emulation with NoUBs
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GLSL_150_ES3_1, // ES3.1 Emulation
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GLSL_ES2_IOS_REMOVED,
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GLSL_310_ES_EXT_REMOVED,
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GLSL_ES3_1_ANDROID,
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GLSL_SWITCH,
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GLSL_SWITCH_FORWARD,
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GLSL_MAX
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};
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class SHADERFORMATOPENGL_API FOpenGLFrontend
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{
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public:
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virtual ~FOpenGLFrontend()
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{
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}
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void CompileShader(const struct FShaderCompilerInput& Input, struct FShaderCompilerOutput& Output, const class FString& WorkingDirectory, GLSLVersion Version);
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protected:
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// does the given version support SSO? Allows subclasses to device based on it's own format
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virtual bool SupportsSeparateShaderObjects(GLSLVersion Version);
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// if true, the shader output map will contain true names (i.e. ColorModifier) instead of helper names for runtime binding (i.e. pb_5)
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virtual bool OutputTrueParameterNames()
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{
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return false;
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}
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virtual bool IsSM5(GLSLVersion Version)
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{
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return false;
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}
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// what is the max number of samplers the shader platform can use?
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virtual uint32 GetMaxSamplers(GLSLVersion Version);
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virtual uint32 CalculateCrossCompilerFlags(GLSLVersion Version, const bool bFullPrecisionInPS, const FShaderCompilerFlags& CompilerFlags);
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// set up compilation information like defines and HlslCompileTarget
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virtual void SetupPerVersionCompilationEnvironment(GLSLVersion Version, class FShaderCompilerDefinitions& AdditionalDefines, EHlslCompileTarget& HlslCompilerTarget);
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virtual void ConvertOpenGLVersionFromGLSLVersion(GLSLVersion InVersion, int& OutMajorVersion, int& OutMinorVersion);
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// create the compiling backend
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virtual struct FGlslCodeBackend* CreateBackend(GLSLVersion Version, uint32 CCFlags, EHlslCompileTarget HlslCompilerTarget);
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// create the language spec
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virtual class FGlslLanguageSpec* CreateLanguageSpec(GLSLVersion Version, bool bDefaultPrecisionIsHalf);
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// Allow a subclass to perform additional work on the cross compiled source code
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virtual bool PostProcessShaderSource(GLSLVersion Version, EShaderFrequency Frequency, const ANSICHAR* ShaderSource,
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uint32 SourceLen, class FShaderParameterMap& ParameterMap, TMap<FString, FString>& BindingNameMap, TArray<struct FShaderCompilerError>& Errors,
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const FShaderCompilerInput& ShaderInput)
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{
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return true;
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}
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// allow subclass to write out different output, returning true if it did write everything it needed
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virtual bool OptionalSerializeOutputAndReturnIfSerialized(FArchive& Ar)
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{
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return false;
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}
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void BuildShaderOutput(FShaderCompilerOutput& ShaderOutput, const FShaderCompilerInput& ShaderInput, const ANSICHAR* InShaderSource, int32 SourceLen, GLSLVersion Version);
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void PrecompileShader(FShaderCompilerOutput& ShaderOutput, const FShaderCompilerInput& ShaderInput, const ANSICHAR* ShaderSource, GLSLVersion Version, EHlslShaderFrequency Frequency);
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bool PlatformSupportsOfflineCompilation(const GLSLVersion ShaderVersion) const;
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// fills device capabilities in 'offline', mostly hardcoded values
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void FillDeviceCapsOfflineCompilation(struct FDeviceCapabilities &Caps, const GLSLVersion ShaderVersion) const;
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// final source code processing, based on device capabilities, before actual (offline) compilation; it mostly mirrors the behaviour of OpenGLShaders.cpp/GLSLToDeviceCompatibleGLSL()
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TSharedPtr<ANSICHAR> PrepareCodeForOfflineCompilation(GLSLVersion ShaderVersion, EShaderFrequency Frequency, const ANSICHAR* InShaderSource) const;
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void CompileOffline(const FShaderCompilerInput& ShaderInput, FShaderCompilerOutput &Output, const GLSLVersion ShaderVersion, const ANSICHAR *InShaderSource);
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// based on ShaderVersion decides what platform specific compiler to use
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void PlatformCompileOffline(const FShaderCompilerInput &Input, FShaderCompilerOutput& ShaderOutput, const ANSICHAR* ShaderSource, const GLSLVersion ShaderVersion);
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};
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