#include "EngineOpenGL.h"

EngineOpenGL::EngineOpenGL(std::string title, unsigned int height, unsigned int width) {
    this->title = title;
    this->height = height;
    this->width = width;
    this->window = NULL;

    this->contextOpenGL = NULL;
    this->sceneOpenGL = NULL;
}

EngineOpenGL::~EngineOpenGL() {
    SDL_GL_DeleteContext(contextOpenGL);
    SDL_DestroyWindow(window);
    SDL_Quit();
    delete sceneOpenGL;
}

void EngineOpenGL::initWindow() {
    // SDL Initialisation
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        throw new SDLInitVideoException();
    }

    // OpenGL Version
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);

    // Double Buffer
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);

    // Window creation
    window = SDL_CreateWindow(title.c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width,
        height, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
    if (window == NULL) {
        throw new SDLCreateWindowException();
    }

    // Add context OpenGL
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    contextOpenGL = SDL_GL_CreateContext(window);
    if (contextOpenGL == NULL) {
        throw new SDLCreateContextGLException();
    }
}

void EngineOpenGL::initGL() {
    //Initialisation of GLEW
    if (glewInit() != GLEW_OK) {
        throw new GLEWInitException();
    }
    glEnable(GL_DEPTH_TEST);
}

void EngineOpenGL::init() {
    initWindow();
    std::cout << "Window initialise..." << std::endl;
    initGL();
    std::cout << "Glew initialise..." << std::endl;
}

void EngineOpenGL::start() {
    sceneOpenGL = new SceneOpenGL(window);
    sceneOpenGL->start();
}