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105 lines
3.0 KiB
C++
105 lines
3.0 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 "hlslcc.h"
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#include "LanguageSpec.h"
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class SHADERFORMATOPENGL_API FGlslLanguageSpec : public ILanguageSpec
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{
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protected:
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bool bDefaultPrecisionIsHalf;
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public:
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FGlslLanguageSpec(bool bInDefaultPrecisionIsHalf)
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: bDefaultPrecisionIsHalf(bInDefaultPrecisionIsHalf)
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{}
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virtual bool SupportsDeterminantIntrinsic() const override
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{
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return true;
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}
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virtual bool SupportsTransposeIntrinsic() const override
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{
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return true;
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}
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virtual bool SupportsIntegerModulo() const override
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{
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return true;
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}
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virtual bool SupportsMatrixConversions() const override { return true; }
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//#todo-rco: Enable
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virtual bool AllowsSharingSamplers() const override { return false; }
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virtual void SetupLanguageIntrinsics(_mesa_glsl_parse_state* State, exec_list* ir) override;
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virtual bool AllowsImageLoadsForNonScalar() const { return true; }
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virtual bool EmulateStructuredWithTypedBuffers() const override { return false; }
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};
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class ir_variable;
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// Generates GLSL compliant code from IR tokens
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#ifdef __GNUC__
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#pragma GCC visibility push(default)
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#endif // __GNUC__
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struct SHADERFORMATOPENGL_API FGlslCodeBackend : public FCodeBackend
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{
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FGlslCodeBackend(unsigned int InHlslCompileFlags, EHlslCompileTarget InTarget) :
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FCodeBackend(InHlslCompileFlags, InTarget),
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bExplicitDepthWrites(false)
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{
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}
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virtual char* GenerateCode(struct exec_list* ir, struct _mesa_glsl_parse_state* ParseState, EHlslShaderFrequency Frequency) override;
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// Return false if there were restrictions that made compilation fail
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virtual bool ApplyAndVerifyPlatformRestrictions(exec_list* Instructions, _mesa_glsl_parse_state* ParseState, EHlslShaderFrequency Frequency) override;
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/**
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* Generate a GLSL main() function that calls the entry point and handles
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* reading and writing all input and output semantics.
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* @param Frequency - The shader frequency.
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* @param EntryPoint - The name of the shader entry point.
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* @param Instructions - IR code.
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* @param ParseState - Parse state.
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*/
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virtual bool GenerateMain(EHlslShaderFrequency Frequency, const char* EntryPoint, exec_list* Instructions, _mesa_glsl_parse_state* ParseState) override;
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void GenShaderPatchConstantFunctionInputs(_mesa_glsl_parse_state* ParseState, ir_variable* OutputPatchVar, exec_list &PostCallInstructions);
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void CallPatchConstantFunction(_mesa_glsl_parse_state* ParseState, ir_variable* OutputPatchVar, ir_function_signature* PatchConstantSig, exec_list& DeclInstructions, exec_list &PostCallInstructions);
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ir_function_signature* FindPatchConstantFunction(exec_list* Instructions, _mesa_glsl_parse_state* ParseState);
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// subclass functionality
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virtual bool AllowsGlobalUniforms()
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{
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return true;
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}
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virtual bool AllowsESLanguage()
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{
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return true;
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}
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virtual bool WantsPrecisionModifiers()
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{
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return Target == HCT_FeatureLevelES3_1 || Target == HCT_FeatureLevelES3_1Ext;
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}
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bool bExplicitDepthWrites;
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};
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#ifdef __GNUC__
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#pragma GCC visibility pop
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#endif // __GNUC__
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