UniformPacker.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "Visitor.hpp"
 
#include "CeresEngine/DataTypes.hpp"
 
#include "CeresEngine/Foundation/String.hpp"
 
#include "CeresEngine/Material/ShaderCompiler/AST/TypeDenoter.hpp"
 
namespace CeresEngine::ShaderCompiler {
 
    class UniformPacker {
    public:
        struct CbufferAttributes {
//NOTE: workaround bug in Clang and GCC where the default constructor struggles with default arguments of braced initializers
#if defined __clang__ || defined __GNUC__
            inline CbufferAttributes() {}
            CbufferAttributes(const CbufferAttributes&) = default;
            CbufferAttributes& operator=(const CbufferAttributes&) = default;
#endif
 
            // Zero-based binding slot, where a negative number indicates to ignore this value.
            Int32 bindingSlot = 0;
 
            // Name of the uniform buffer object.
            String name = "xsp_cbuffer";
        };
 
    private:
        CbufferAttributes mCbufferAttribs;
 
        UniformBufferDeclarationPtr mUniformBufferDeclaration;
        BasicDeclarationStatementPtr mDeclarationStatement;
 
    public:
        // Converts the program by moving all global uniform declarations into a single uniform buffer.
        void convert(Program& program, const CbufferAttributes& cbufferAttribs = {}, bool onlyReachableStatements = true);
 
    private:
        void makeUniformBuffer();
        void appendUniform(const VarDeclarationStatementPtr& varDeclarationStatement);
 
        [[nodiscard]] bool canConvertUniformWithTypeDenoter(const TypeDenoter& typeDen) const;
    };
 
} // namespace CeresEngine::ShaderCompiler