Query 3 GTKGLEXT Library QueryFunctions to query OpenGL support information #include <gdk/gdkgl.h> void (*GdkGLProc) (void); gboolean gdk_gl_query_extension (void); gboolean gdk_gl_query_extension_for_display (GdkDisplay *display); gboolean gdk_gl_query_version (int *major, int *minor); gboolean gdk_gl_query_version_for_display (GdkDisplay *display, int *major, int *minor); gboolean gdk_gl_query_gl_extension (const char *extension); GdkGLProc gdk_gl_get_proc_address (const char *proc_name); GdkGLProcvoid (*GdkGLProc) (void); gdk_gl_query_extensiongboolean gdk_gl_query_extension (void); Indicates whether the window system supports the OpenGL extension (GLX, WGL, etc.). Returns : TRUE if OpenGL is supported, FALSE otherwise. gdk_gl_query_extension_for_displaygboolean gdk_gl_query_extension_for_display (GdkDisplay *display); Indicates whether the window system supports the OpenGL extension (GLX, WGL, etc.). display : the GdkDisplay where the query is sent to. Returns : TRUE if OpenGL is supported, FALSE otherwise. gdk_gl_query_versiongboolean gdk_gl_query_version (int *major, int *minor); Returns the version numbers of the OpenGL extension to the window system. In the X Window System, it returns the GLX version. In the Microsoft Windows, it returns the Windows version. major : returns the major version number of the OpenGL extension. minor : returns the minor version number of the OpenGL extension. Returns : FALSE if it fails, TRUE otherwise. gdk_gl_query_version_for_displaygboolean gdk_gl_query_version_for_display (GdkDisplay *display, int *major, int *minor); Returns the version numbers of the OpenGL extension to the window system. In the X Window System, it returns the GLX version. In the Microsoft Windows, it returns the Windows version. display : the GdkDisplay where the query is sent to. major : returns the major version number of the OpenGL extension. minor : returns the minor version number of the OpenGL extension. Returns : FALSE if it fails, TRUE otherwise. gdk_gl_query_gl_extensiongboolean gdk_gl_query_gl_extension (const char *extension); Determines whether a given OpenGL extension is supported. There must be a valid current rendering context to call gdk_gl_query_gl_extension(). gdk_gl_query_gl_extension() returns information about OpenGL extensions only. This means that window system dependent extensions (for example, GLX extensions) are not reported by gdk_gl_query_gl_extension(). extension : name of OpenGL extension. Returns : TRUE if the OpenGL extension is supported, FALSE if not supported. gdk_gl_get_proc_addressGdkGLProc gdk_gl_get_proc_address (const char *proc_name); Returns the address of the OpenGL, GLU, or GLX function. proc_name : function name. Returns : the address of the function named by proc_name.