#include <windows.h>
#include <gl/gl.h>
#include "GLContext.h"

GLContext::GLContext ()
{
	reset();
}

GLContext::GLContext (HWND hWnd)
{
	init (hWnd);
}

GLContext::~GLContext ()
{
	purge();
}

void GLContext::init (HWND hWnd)
{
	PIXELFORMATDESCRIPTOR pfd; // Description du Pixel Format
	int format;

	this->hWnd = hWnd; // Obtention du Handle de la fenetre hwnd
	hDC = GetDC (hWnd); // Obtention du device context (DC)

	// Configuration du Pixel format pour le DC
	ZeroMemory (&pfd, sizeof (pfd));
	pfd.nSize = sizeof (pfd);
	pfd.nVersion = 1;
	pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
	pfd.iPixelType = PFD_TYPE_RGBA;
	pfd.cColorBits = 24;
	pfd.cDepthBits = 32;
	pfd.iLayerType = PFD_MAIN_PLANE;
	format = ChoosePixelFormat (hDC, &pfd);
	SetPixelFormat (hDC, format, &pfd);

	hRC = wglCreateContext (hDC); // Creation du context de rendu (RC)
	wglMakeCurrent (hDC, hRC); // Application du context de rendu actuel
}

void GLContext::purge ()
{
	if (hRC)
	{
		wglMakeCurrent (NULL, NULL);
		wglDeleteContext (hRC);
	}
	if (hWnd && hDC)
	{
		ReleaseDC (hWnd, hDC);
	}
	reset();
}

void GLContext::reset ()
{
	hWnd = NULL;
	hDC = NULL;
	hRC = NULL;
}

HDC GLContext::getHDC ()
{
	return hDC;
}

HGLRC GLContext::getHGLRC ()
{
	return hRC;
}