shader-program.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_GL_SHADER_PROGRAM_HPP
#define ANTKEEPER_GL_SHADER_PROGRAM_HPP
 
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <cstdint>
#include <memory>
#include <engine/utility/hash/fnv1a.hpp>
 
namespace gl {
 
class shader_object;
class shader_variable;
 
class shader_program
{
public:
    shader_program();
    
    ~shader_program();
    
    shader_program(const shader_program&) = delete;
    shader_program(shader_program&&) = delete;
    shader_program& operator=(const shader_program&) = delete;
    shader_program& operator=(shader_program&&) = delete;
    
    void attach(const shader_object& object);
    
    void detach(const shader_object& object);
    
    void detach_all();
    
    bool link();
    
    [[nodiscard]] inline bool linked() const noexcept
    {
        return m_linked;
    }
    
    [[nodiscard]] inline const std::unordered_map<hash::fnv1a32_t, const std::unique_ptr<const shader_variable>>& variables() const noexcept
    {
        return variable_map;
    }
    
    [[nodiscard]] inline const shader_variable* variable(hash::fnv1a32_t key) const
    {
        if (auto i = variable_map.find(key); i != variable_map.end())
        {
            return i->second.get();
        }
        
        return nullptr;
    }
    
    [[nodiscard]] inline const std::string& info() const noexcept
    {
        return info_log;
    }
 
private:
    friend class pipeline;
    
    void load_variables();
    
    unsigned int gl_program_id{0};
    bool m_linked{false};
    std::unordered_set<const shader_object*> attached_objects;
    std::unordered_map<hash::fnv1a32_t, const std::unique_ptr<const shader_variable>> variable_map;
    std::string info_log;
};
 
} // namespace gl
 
#endif // ANTKEEPER_GL_SHADER_PROGRAM_HPP