#include "display.h"
#include <GL/glew.h>
#include <stdexcept>

Display::Display(int width, int height, const std::string & title)
{
	SDL_Init(SDL_INIT_EVERYTHING);

	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32);
	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

	m_window = m_window.create(SDL_CreateWindow, SDL_DestroyWindow, title.c_str(), SDL_WINDOWPOS_CENTERED,
			SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_OPENGL);
	m_glContext = m_glContext.create(SDL_GL_CreateContext, SDL_GL_DeleteContext, m_window);

	if (glewInit() != GLEW_OK) {
		throw std::runtime_error {"Glew failed to initialize!"};
	}

	glEnable(GL_DEPTH_TEST);

	glEnable(GL_CULL_FACE);
	glCullFace(GL_BACK);
}

Display::~Display()
{
	SDL_Quit();
}

void
Display::Clear(float r, float g, float b, float a) const
{
	glClearColor(r, g, b, a);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

void
Display::SwapBuffers() const
{
	SDL_GL_SwapWindow(m_window);
}