Section 3: library functions
glutInit – Initialize OpenGLUT data structures. Library OpenGLUT – mainloop Synopsis In openglut.h Ft void Fn glutInit int *pargc char **argv Parameters Bf Em pargc Ef Pointer to something like main()’s Bf Sy argc. Ef Bf Em argv Ef Something like main()’s Bf Sy argv. Ef Description This function should be called once,…
glutIgnoreKeyRepeat – Set autorepeat status. Library OpenGLUT – inputstate Synopsis In openglut.h Ft void Fn glutIgnoreKeyRepeat int ignore Parameters Bf Em ignore Ef Whether to ignore autorepeated keys. Description If Bf Sy ignore Ef is non-zero, then auto-repeat is disabled for keyboard callbacks for the Bf Li current window Ef . See Also glutSetKeyRepeat(3)
glutIdleFunc – Sets the global idle callback. Library OpenGLUT – idletimer Synopsis In openglut.h Ft void Fn glutIdleFunc void( *callback )( void ) Parameters Bf Em callback Ef Client function for idle event. Description When OpenGLUT’s glutMainLoop() is doing nothing else, it checks to see if an “idle” callback set. If so, OpenGLUT invokes that…
glutIconifyWindow – Iconify the current window Library OpenGLUT – window Synopsis In openglut.h Ft void Fn glutIconifyWindow void Description Most window systems have some kind of “minimized” or “iconified” state for windows. All systems currently supported by OpenGLUT do so. The exact meaning of iconification is somewhat system-dependant, but this makes a request of the…
glutHideWindow – Make the current window hidden Library OpenGLUT – window Synopsis In openglut.h Ft void Fn glutHideWindow void Description Even if a window is “open”, it need not be visible. It may be convenient to hide a window rather than to close it, if you want to re-display the window at the same location…
glutHideOverlay – Make an overlay invisible. Library OpenGLUT – overlays Synopsis In openglut.h Ft void Fn glutHideOverlay void Description Causes a visible overlay to become invisible. Applies to the Bf Li current window Ef . Caveats Unimplemented. See Also glutEstablishOverlay(3) glutRemoveOverlay(3) glutUseLayer(3) glutPostOverlayRedisplay(3) glutPostWindowOverlayRedisplay(3) glutShowOverlay(3)
glutGetWindowData – Get the user data for the current window Library OpenGLUT – window Synopsis In openglut.h Ft void* Fn glutGetWindowData void Description This function will return whatever Bf Sy void* Ef value is associated with the Bf Li current window Ef via glutSetWindowData(). This is Bf Sy NULL Ef if you did not associate…
glutGetWindow – Return the current window identifier, 0 if undefined Library OpenGLUT – window Synopsis In openglut.h Ft int Fn glutGetWindow void Description glutGetWindow() returns the Bf Li window id Ef of the Bf Li current window Ef . This is useful, e.g., if you have a generic function that is used with several windows and…
glutGetProcAddress – Determine if an OpenGLUT feature or extension is available. Library OpenGLUT – openglut Synopsis In openglut.h Ft void Fn glutGetProcAddress const char *procName Parameters Bf Em procName Ef Procedure name. Description Given a function name, searches for the function (or "procedure", hence "Proc") in internal tables. If the function is found, a pointer…
glutGetModifiers – Returns the status of Alt, Shift, and Ctrl keys. Library OpenGLUT – inputstate Synopsis In openglut.h Ft int Fn glutGetModifiers void Description According to which, if any, modifier keys are held, the return value is the logical Bf Sy OR Ef combination of any of the following symbolic bitmasks: – Bf Sy GLUT_ACTIVE_SHIFT…
glutGetMenuData – Retrieve menu user data pointer Library OpenGLUT – menus Synopsis In openglut.h Ft void Fn glutGetMenuData void Description Retrieve a previously stored user data pointer from the current menu. See Also glutSetMenuData(3)
glutGetMenu – Get the current menu ID. Library OpenGLUT – menus Synopsis In openglut.h Ft int Fn glutGetMenu void Description Returns the integer ID of the current menu. See Also glutSetMenu(3)
glutGetColor – Gets an indexed color-mode entry’s Red, Green, or Blue value. Library OpenGLUT – colormap Synopsis In openglut.h Ft GLfloat Fn glutGetColor int color int component Parameters Bf Em color Ef The palette entry to fetch. Bf Em component Ef Whether to fetch Red, Green, or Blue. Description Allows you to get individual color-map…
glutGet – Allows you to query some general state/option variables. Library OpenGLUT – state Synopsis In openglut.h Ft int Fn glutGet GLenum eWhat Parameters Bf Em eWhat Ef Enumerated parameter ID. Description This function permits you to query for the current value of many different OpenGLUT state variables. The current list is: – Bf Sy…
glutGameModeString – Set the game mode display string Library OpenGLUT – gamemode Synopsis In openglut.h Ft void Fn glutGameModeString const char *string Parameters Bf Em string Ef A configuration parameter as a string. Description Sets the gamemode status according to an undocumented string. Glancing at old GLUT 3.7, the freeglut codebase that we inherited does…
glutGameModeGet – Return the value of a game mode parameter Library OpenGLUT – gamemode Synopsis In openglut.h Ft int Fn glutGameModeGet GLenum pname Parameters Bf Em pname Ef The parameter value to be returned Description Bf Sy pname Ef is one of: – Bf Sy GLUT_GAME_MODE_ACTIVE Ef Return non-zero if we are presently in…
glutFullScreen – Resize the current window to cover the entire screen Library OpenGLUT – window Synopsis In openglut.h Ft void Fn glutFullScreen void Description The glutFullScreen() function resizes the window to cover the entire screen and hide window decorations such as title bars and icons. Caveats The desktop resolution is not affected by a call…
glutForceJoystickFunc – Forces a joystick poll and callback. Library OpenGLUT – input Synopsis In openglut.h Ft void Fn glutForceJoystickFunc void Description Forces the OpenGLUT joystick code to poll your joystick(s) and to call your joystick callbacks with the result. The operation completes, including callbacks, before glutForceJoystickFunc() returns. Bugs The original WINCE import used a #if…
glutExtensionSupported – Determine if an OpenGL extension is available. Library OpenGLUT – opengl Synopsis In openglut.h Ft int Fn glutExtensionSupported const char *extension Parameters Bf Em extension Ef A string-name of an extension. Description Returns 0 if OpenGLUT cannot determine that the requested extension is definitely present. Only checks extensions from glGetString(). Todo Wouldn’t this…
glutEstablishOverlay – Creates an overlay. Library OpenGLUT – overlays Synopsis In openglut.h Ft void Fn glutEstablishOverlay void Description Creates an overlay associated with the Bf Li current window Ef . Caveats Unimplemented. Old GLUT would terminate the program when an overlay was not possible. freeglut ignores the request; OpenGLUT ignores the request as well. See…