glutreporterrors(3glut) [mojave man page]

glutReportErrors(3GLUT) 					       GLUT						   glutReportErrors(3GLUT)

NAME

       glutReportErrors - for debugging purposes; prints out OpenGL run-time errors.

SYNTAX

       #include <GLUT/glut.h>

       void glutReportErrors(void);

DESCRIPTION

       This routine prints out any OpenGL run-time errors pending and clears the errors.  This routine typically should only be used for debugging
       purposes since calling it will slow OpenGL programs.  It is provided as a convenience; all the routine does is  call  glGetError  until	no
       more  errors  are  reported.   Any  errors detected are reported with a GLUT warning and the corresponding text message generated by gluEr-
       rorString.

       Calling glutReportErrors repeatedly in your program can help isolate OpenGL errors to the offending OpenGL command.  Remember that you  can
       use the -gldebug option to detect OpenGL errors in any GLUT program.

SEE ALSO

       glutInit, glutCreateWindow, glutInitDisplayMode, gluErrorString, glGetError

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7						   glutReportErrors(3GLUT)

glutExtensionSupported(3GLUT)					       GLUT					     glutExtensionSupported(3GLUT)

NAME

       glutExtensionSupported - helps to easily determine whether a given OpenGL extension is supported.

SYNTAX

       #include <GLUT/glut.h>

       int glutExtensionSupported(char *extension);

ARGUMENTS

       extension Name of OpenGL extension.

DESCRIPTION

       glutExtensionSupported  helps  to  easily determine whether a given OpenGL extension is supported or not. The extension parameter names the
       extension to query. The supported extensions can also be determined with glGetString(GL_EXTENSIONS), but  glutExtensionSupported  does  the
       correct parsing of the returned string.

       glutExtensionSupported returns non-zero if the extension is supported, zero if not supported.

       There must be a valid current window to call glutExtensionSupported.

       glutExtensionSupported  only  returns information about OpenGL extensions only. This means window system dependent extensions (for example,
       GLX extensions) are not reported by glutExtensionSupported.

EXAMPLE

       Here is an example of using glutExtensionSupported:

	 if (!glutExtensionSupported("GL_EXT_texture")) {
	   fprintf(stderr, "Missing the texture extension!
");
	   exit(1);
	 }

       Notice that the name argument includes both the GL prefix and the extension family prefix (EXT).

SEE ALSO

       glutGet, glGetString

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7					     glutExtensionSupported(3GLUT)