Inventor/devices/SoGLExtension.h

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**=======================================================================*/
/*=======================================================================
** Author      : Rodolphe ALBOU (Oct 2001)
**=======================================================================*/

#ifndef _SO_GL_EXTENSION_H_
#define _SO_GL_EXTENSION_H_

#include <Inventor/SbBasic.h>
#include <Inventor/SbString.h>
#include <Inventor/STL/list>
#include <Inventor/threads/SbThreadSpinlock.h>

class SoGLWindow;
class SbPList;

#if defined (_WIN32)
// Prototype declarations for Win32 specific context handling
typedef int (WINAPI * PFNWGLCHOOSEPIXELFORMATPROC) (HDC hdc, const PIXELFORMATDESCRIPTOR* ppfd);  
typedef int (WINAPI * PFNWGLDESCRIBEPIXELFORMATPROC) (HDC hdc, int iPixelFormat, UINT nBytes, LPPIXELFORMATDESCRIPTOR ppfd);
typedef int (WINAPI * PFNWGLSETPIXELFORMATPROC) (HDC hDC, int pf, const PIXELFORMATDESCRIPTOR* pfd);
typedef int (WINAPI * PFNWGLSWAPBUFFERSPROC) (HDC hdc);

#define wglChoosePixelFormat    SoGLExtension::m_wglChoosePixelFormat
#define wglSetPixelFormat       SoGLExtension::m_wglSetPixelFormat
#define wglDescribePixelFormat  SoGLExtension::m_wglDescribePixelFormat
#define wglSwapBuffers          SoGLExtension::m_wglSwapBuffers

#endif // _WIN32

#ifdef _MSC_VER
#pragma warning( push )
#pragma warning(disable:4251)
#endif

class  SoGLExtension {

public:
  static SbBool isAvailable( const char* extension );

  static SbBool isAvailable( const SbString& extension );

  static void disableExtension(const SbString& extension);

private:
  static int          getExtID(const char *str);

  static SbBool       extSupported(int contextID, int ext);

private:
  static SbBool initClass();

  static void exitClass();

  static SbBool isInitialized();

#if defined(_WIN32)
  static PFNWGLCHOOSEPIXELFORMATPROC    m_wglChoosePixelFormat;
  static PFNWGLSETPIXELFORMATPROC       m_wglSetPixelFormat;
  static PFNWGLDESCRIBEPIXELFORMATPROC  m_wglDescribePixelFormat;
  static PFNWGLSWAPBUFFERSPROC          m_wglSwapBuffers;
#endif // _WIN32

  static SbBool hasFullFloat32TextureSupport();

private:
  static SoGLWindow* createAndEnableFakeContext();

  static std::list<char*> s_disabledList;
  static SbBool           s_initialized;

  static SbThreadSpinlock s_extensionListMutex;
  static SbPList* s_extensionList;

  static int s_checkContext;
};

#ifdef _MSC_VER
#pragma warning( pop )
#endif

#endif // _SO_GL_EXTENSION_H_

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Open Inventor Toolkit reference manual, generated on 15 Mar 2023
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