WGL_EXT_pbuffer
http://oss.sgi.com/projects/ogl-sample/registry/EXT/wgl_pbuffer.txt
	WGL_DRAW_TO_PBUFFER_EXT 0x202D
	WGL_MAX_PBUFFER_PIXELS_EXT 0x202E
	WGL_MAX_PBUFFER_WIDTH_EXT 0x202F
	WGL_MAX_PBUFFER_HEIGHT_EXT 0x2030
	WGL_OPTIMAL_PBUFFER_WIDTH_EXT 0x2031
	WGL_OPTIMAL_PBUFFER_HEIGHT_EXT 0x2032
	WGL_PBUFFER_LARGEST_EXT 0x2033
	WGL_PBUFFER_WIDTH_EXT 0x2034
	WGL_PBUFFER_HEIGHT_EXT 0x2035
	HPBUFFEREXT wglCreatePbufferEXT (HDC hDC, int iPixelFormat, int iWidth, int iHeight, const int* piAttribList)
	BOOL wglDestroyPbufferEXT (HPBUFFEREXT hPbuffer)
	HDC wglGetPbufferDCEXT (HPBUFFEREXT hPbuffer)
	BOOL wglQueryPbufferEXT (HPBUFFEREXT hPbuffer, int iAttribute, int* piValue)
	int wglReleasePbufferDCEXT (HPBUFFEREXT hPbuffer, HDC hDC)
	DECLARE_HANDLE(HPBUFFEREXT);