GLProgram.h

// Copyright 2022 ShenMian
// License(Apache-2.0)
 
#pragma once
 
#include "Program.h"
#include <glad/glad.h>
#include <unordered_map>
 
class Shader;
 
class GLProgram : public Program
{
public:
    GLProgram(const Descriptor& desc);
    virtual ~GLProgram();
 
    void use() override;
 
    void set_uniform(const std::string& name, int value) override;
    void set_uniform(const std::string& name, float value) override;
    void set_uniform(const std::string& name, const Vector2& value) override;
    void set_uniform(const std::string& name, const Vector3& value) override;
    void set_uniform(const std::string& name, const Vector4& value) override;
    void set_uniform(const std::string& name, const Matrix4& value) override;
 
    operator GLuint() const noexcept;
 
private:
    int get_uniform_buffer_location(const std::string& name) const;
 
    int get_uniform_location(const std::string& name) const;
 
    void attach(const std::shared_ptr<Shader> shader);
    void detach(const std::shared_ptr<Shader> shader);
    void link();
 
    GLuint                                       handle_;
    mutable std::unordered_map<std::string, int> uniform_location_cache_;
};