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/*
* Copyright 2010 Inalogic® Inc.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, as
* published by the Free Software Foundation; either version 2.1 or 3.0
* of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the applicable version of the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of both the GNU Lesser General Public
* License along with this program. If not, see <http://www.gnu.org/licenses/>
*
* Authored by: Jay Taoko <jaytaoko@inalogic.com>
*
*/
#ifndef __PBUFFERS_H__
#define __PBUFFERS_H__
#ifndef NUX_OPENGLES_20
#if defined(WIN32)
#include "GLResource.h"
# pragma warning (disable : 4786)
#elif defined(UNIX)
# include <GL/glx.h>
# include <GL/glxext.h>
#elif defined(__APPLE__)
# include <AGL/agl.h>
#endif
#include <string>
#include <vector>
// The pixel format for the pbuffer is controlled by the mode string passed
// into the PBuffer constructor. This string can have the following attributes:
//
// r - r pixel format (for float buffer).
// rg - rg pixel format (for float buffer).
// rgb - rgb pixel format. 8 bit or 16/32 bit in float buffer mode
// rgba - same as "rgb alpha" string
// alpha - must have alpha channel
// depth - must have a depth buffer
// depth=n - must have n-bit depth buffer
// stencil - must have a stencil buffer
// double - must support double buffered rendering
// samples=n - must support n-sample antialiasing (n can be 2 or 4)
// float=n - must support n-bit per channel floating point
//
// texture2D
// textureRECT
// textureCUBE - must support binding pbuffer as texture to specified target
// - binding the depth buffer is also supporting by specifying
// '=depth' like so: texture2D=depth or textureRECT=depth
// - the internal format of the texture will be rgba by default or
// float if pbuffer is floating point
//
namespace nux
{
class PBuffer
{
public:
// see above for documentation on strMode format
// set managed to true if you want the class to cleanup OpenGL objects in destructor
PBuffer (const char *strMode, bool managed = false);
~PBuffer();
bool Initialize (int iWidth, int iHeight, bool bShareContexts, bool bShareObjects);
void Destroy();
void Activate (PBuffer *current = NULL); // to switch between pbuffers, pass active pbuffer as argument
void Deactivate();
#if defined(WIN32)
int Bind (int iBuffer);
int Release (int iBuffer);
void HandleModeSwitch();
#endif
unsigned int GetSizeInBytes();
unsigned int CopyToBuffer (void *ptr, int w = -1, int h = -1);
inline int GetNumComponents()
{
return m_iNComponents;
}
inline int GetBitsPerComponent()
{
return m_iBitsPerComponent;
}
inline int GetWidth()
{
return m_iWidth;
}
inline int GetHeight()
{
return m_iHeight;
}
inline bool IsSharedContext()
{
return m_bSharedContext;
}
#if defined(WIN32)
inline bool IsTexture()
{
return m_bIsTexture;
}
#endif
protected:
#if defined(NUX_OS_WINDOWS)
HDC m_hDC; ///< Handle to a device context.
HGLRC m_hGLRC; ///< Handle to a GL context.
HPBUFFERARB m_hPBuffer;///< Handle to a pbuffer.
HGLRC m_hOldGLRC;
HDC m_hOldDC;
std::vector<int> m_pfAttribList;
std::vector<int> m_pbAttribList;
bool m_bIsTexture;
#elif defined(NUX_OS_LINUX)
Display *m_pDisplay;
GLXPbuffer m_glxPbuffer;
GLXContext m_glxContext;
Display *m_pOldDisplay;
GLXPbuffer m_glxOldDrawable;
GLXContext m_glxOldContext;
std::vector<int> m_pfAttribList;
std::vector<int> m_pbAttribList;
#elif defined(NUX_OS_MACOSX)
AGLContext m_context;
WindowPtr m_window;
std::vector<int> m_pfAttribList;
#endif
int m_iWidth;
int m_iHeight;
int m_iNComponents;
int m_iBitsPerComponent;
const char *m_strMode;
bool m_bSharedContext;
bool m_bShareObjects;
private:
std::string getStringValue (std::string token);
int getIntegerValue (std::string token);
#if defined(NUX_OS_WINDOWS) || defined(NUX_OS_LINUX)
void parseModeString (const char *modeString, std::vector<int> *pfAttribList, std::vector<int> *pbAttribList);
bool m_bIsBound;
bool m_bIsActive;
bool m_bManaged;
#endif
};
}
#endif // NUX_OPENGLES_20
#endif // __PBUFFERS_H__
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