include/RenderBackend/OpenGL/ShaderProgram.hpp


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#pragma once

#include "VertexShader.hpp"
#include "PixelShader.hpp"
#include "../../Result.hpp"
#include "../../types.hpp"
#include <vector>

namespace amalgine
{
    class ShaderProgram
    {
    public:
        ShaderProgram();
        
        const std::string& getOutputAttributeName(i32 attributeIndex);
        ShaderOutputVec4 defineOutputVec4(const std::string &name);
        //Result<std::string> addVertexShader(const VertexShader &vertexShader);
        //Result<std::string> addPixelShader(const PixelShader &pixelShader);
        //void build();
    private:
        /*
         * Throws PixelShaderTooManyAttributes if too many pixel attributes are defined for the platform.
         * Throws PixelShaderAttributeAlreadyDefined if a pixel attribute with the same name has already been defined.
         */
        i32 defineOutputVariable(const std::string &variableName, const char *typeName);
    private:
        int locationCounter;
        i32 maxPixelAttribs; // Could make this static
        std::unordered_map<std::string, i32> pixelAttributes;
        std::vector<std::string> pixelAttributeNames;
        std::vector<u32> shaderIds;
    };
}