/******************************************************************************
 * $id: mapoglcontext.h 7725 2011-04-09 15:56:58Z toby $
 *
 * Project:  MapServer
 * Purpose:  Various template processing functions.
 * Author:   Steve Lime and the MapServer team.
 *
 ******************************************************************************
 * Copyright (c) 1996-2008 Regents of the University of Minnesota.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in 
 * all copies of this Software or works derived from this Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#ifndef MAPOGLCONTEXT_H_
#define MAPOGLCONTEXT_H_

#ifdef USE_OGL


#if defined(_WIN32) && !defined(__CYGWIN__)

#include <windows.h>
#include<GL/gl.h>
#include<GL/glu.h>

#include "opengl/glext.h"
#include "opengl/wglext.h"

typedef HDC OGL_WINDOW;
typedef HGLRC OGL_CONTEXT;
typedef HGLRC OGL_PBUFFER;

#define CALLBACK __stdcall

#else

#include<GL/gl.h>
#include<GL/glx.h>
#include<GL/glu.h>

typedef Display* OGL_WINDOW;
typedef GLXContext OGL_CONTEXT;
typedef GLXPbuffer OGL_PBUFFER;

#define CALLBACK

#endif

class OglRenderer;

class OglContext {
private:
    static OglContext* current;
    static bool initWindow();
    static bool initSharingContext();
    static ms_uint32 getTextureSize(GLuint dimension, ms_uint32 value);
    static GLuint NextPowerOf2(GLuint in);

#if defined(_WIN32) && !defined(__CYGWIN__)
    static HDC window;
    static HGLRC sharingContext;
    HDC hPBufferDC;
    HGLRC hPBufferRC;
#else
    static Display* window;
    static GLXContext sharingContext;
    static GLXFBConfig* configs;
    GLXPbuffer pbuffer;
#endif

public:
    static ms_uint32 MAX_MULTISAMPLE_SAMPLES;
    static ms_uint32 MAX_ANISOTROPY;
    static ms_uint32 MAX_TEXTURE_SIZE;
    static ms_uint32 MIN_TEXTURE_SIZE;

    OglContext(ms_uint32 width, ms_uint32 height);
    ~OglContext();
    int getHeight() const { return height; }
    int getWidth() const { return width; }
    bool isValid() const { return valid; }
    bool makeCurrent();
    void bindPBufferToTexture();
private:
    bool createPBuffer(ms_uint32 width, ms_uint32 height);
    ms_uint32 width;
    ms_uint32 height;
    bool valid;
    int windowPixelFormat;    

#if defined(_WIN32) && !defined(__CYGWIN__)
    static PFNWGLCHOOSEPIXELFORMATARBPROC wglChoosePixelFormatARB;
    static PFNWGLCREATEPBUFFERARBPROC wglCreatePbufferARB;
    static PFNWGLGETPBUFFERDCARBPROC wglGetPbufferDCARB;
    static PFNWGLRELEASEPBUFFERDCARBPROC wglReleasePbufferDCARB;
    static PFNWGLMAKECONTEXTCURRENTARBPROC wglMakeContextCurrentARB;
#endif
};

#endif /* USE_OGL */
#endif /* MAPOGLCONTEXT_H_ */