OpenGL.hpp

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#ifndef OPENGL_HPP
#define OPENGL_HPP
#include <cstdint>
#include <filesystem>
#include <engine/resources/Shader.hpp>
 
namespace engine::resources {
    class Skybox;
}
 
#define CHECKED_GL_CALL(func, ...) engine::graphics::OpenGL::call(std::source_location::current(), func, __VA_ARGS__)
 
namespace engine::graphics {
    class OpenGL {
    public:
        using ShaderProgramId = uint32_t;
 
        template<typename TResult, typename... TOpenGLArgs, typename... Args>
        static TResult call(std::source_location location, TResult (*glfun)(TOpenGLArgs...), Args... args) {
            // @formatter:off
            if constexpr (!std::is_same_v<TResult, void>) {
                auto result = glfun(std::forward<Args>(args)...);
                #ifndef NDEBUG
                    assert_no_error(location);
                #endif
                return result;
            } else {
                glfun(std::forward<Args>(args)...);
                #ifndef NDEBUG
                    assert_no_error(location);
                #endif
            }
            // @formatter:on
        }
 
        static int32_t shader_type_to_opengl_type(resources::ShaderType type);
 
        static uint32_t generate_texture(const std::filesystem::path &path, bool flip_uvs);
 
        static int32_t texture_format(int32_t number_of_channels);
 
        static uint32_t init_skybox_cube();
 
        static bool shader_compiled_successfully(uint32_t shader_id);
 
        static uint32_t compile_shader(const std::string &shader_source,
                                       resources::ShaderType shader_type);
 
        static uint32_t load_skybox_textures(const std::filesystem::path &path, bool flip_uvs = false);
 
        static void enable_depth_testing();
 
        static void disable_depth_testing();
 
        static void clear_buffers();
 
        static std::string get_compilation_error_message(uint32_t shader_id);
 
    private
    :
        static void assert_no_error(std::source_location location);
    };
}
#endif //OPENGL_HPP