*/
void FGAPIENTRY glutDisplayFunc( void (* callback)( void ) )
{
+ if( !callback )
+ fgError ("Fatal error in program. NULL display callback not "
+ "permitted in GLUT 3.0+ or freeglut 2.0.1+\n");
SET_CALLBACK( Display );
/*
/*
* Create a new freeglut timer hook structure
*/
- timer = calloc( sizeof(SFG_Timer), 1 );
+ timer = (SFG_Timer *)calloc( sizeof(SFG_Timer), 1 );
+ if (!timer)
+ fgError ("Fatal error: "
+ "Memory allocation failure in glutTimerFunc()\n");
/*
* Remember the callback address and timer hook's ID
*/
static void fghVisibility( int status )
{
- freeglut_assert_ready; freeglut_return_if_fail( fgStructure.Window != NULL );
+ freeglut_assert_ready;
+ freeglut_return_if_fail( fgStructure.Window != NULL );
freeglut_return_if_fail( fgStructure.Window->Callbacks.Visibility != NULL );
if( status == GLUT_HIDDEN || status == GLUT_FULLY_COVERED )