UNTITLED LOCAL UNTITLED
NAME
glutSetOption -- Allows you to set some general state/option variables.
LIBRARY
OpenGLUT - state
SYNOPSIS
#include <openglut.h>
void
glutSetOption(GLenum eWhat, int value);
PARAMETERS
eWhat Enumerated parameter ID.
value New value.
DESCRIPTION
Stores the value into a state variable named by eWhat.
Allowable eWhat IDs are:
- GLUT_ACTION_ON_WINDOW_CLOSE
Controls what happens when a window is closed by the user or system. GLUT_ACTION_EXIT will immediately exit the application (default).
GLUT_ACTION_GLUTMAINLOOP_RETURNS will immediately return from the main loop. GLUT_ACTION_CONTINUE_EXECUTION will contine execution of
remaining windows.
- GLUT_INIT_DISPLAY_MODE
An alternate way to set the display mode for a new window.
- GLUT_INIT_WINDOW_HEIGHT
An alternate way to set the height of new windows.
- GLUT_INIT_WINDOW_WIDTH
An alternate way to set the width of new windows.
- GLUT_INIT_WINDOW_X
An alternate way to set the initial horizontal position of new windows.
- GLUT_INIT_WINDOW_Y
An alternate way to set the initial vertical position of new windows.
- GLUT_RENDERING_CONTEXT
Set to either GLUT_CREATE_NEW_CONTEXT or GUT_USE_CURRENT_CONTEXT to indicate whether to share the current OpenGL rendering context with
new windows.
- GLUT_WINDOW_CURSOR
Attempt to set the current window 's current cursor as if by glutSetCursor().
SEE ALSO glutGet(3)glutDeviceGet(3)glutGetModifiers(3)glutLayerGet(3)glutDestroyWindow(3)glutMainLoop(3)glutInitDisplayMode(3)glutInit(3)glutInitWindowSize(3)glutInitWindowPosition(3)glutSetCursor(3)
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UNTITLED LOCAL UNTITLED
NAME
glutInit -- Initialize OpenGLUT data structures.
LIBRARY
OpenGLUT - mainloop
SYNOPSIS
#include <openglut.h>
void
glutInit(int *pargc, char **argv);
PARAMETERS
pargc Pointer to something like main()'s argc.
argv Something like main()'s argv.
DESCRIPTION
This function should be called once, near the start of any GLUT, freeglut, or OpenGLUT program. It serves two vital roles:
- It allows OpenGLUT to initialize internal structures.
- It allows OpenGLUT to process command-line arguments to control the initial window position, etc.
You should take note of the interaction between glutInit() and the related functions such as glutInitWindowPosition(). OpenGLUT always uses
the most recent configuration information, so if you call glutInit(), then glutInitWindowPosition(), you prevent the user from controlling
the initial window position via a command-line parameter.
glutInit() will remove from pargc, argv any parameters that it recognizes in the command line. The following command-line parameters are
suported:
- -display display-id This allows connection to an alternate X server.
- -geometry geometry-spec This takes width, height, and window position. The position is given as a signed value (negative values being
distance from the far boundary of the screen). For example, a window geometry of 5x7+11-17 is 5 pixels wide, 7 pixels tall, 11 pixels from
the left, and 17 pixels from the bottom edge of the screen.
- -direct Insist on only OpenGL direct rendering. Direct rendering is normally requested but indirect is normally accepted. -direct is
not always available. See -indirect.
- -indirect Attempt only indirect OpenGL rendering. -indirect is always available. See -direct.
- -iconic Open the window in iconized form.
- -gldebug Print any detected OpenGL errors via glutReportErrors(). Presently done at the bottom of glutMainLoopEvent().
- -sync Synchronize the window system communications heavily.
Additionally, this function checks whether the environment variable GLUT_FPS is defined (only on UNIX_X11); if so, OpenGLUT will periodi-
cally print the average number of times per second that your program calls glutSwapBuffers().
CAVEATS
You really should always call this, even if you are a WIN32 user. It provides a way for the user to directly inform OpenGLUT about prefer-
ences without the application needing to explicitly deal with those issues. This is also where OpenGLUT retrieves your program's name to
help disambiguate error and warning messages it may be forced to emit.
Option -sync sets a flag, but is not actually used at this time.
Lots of code does XFlush() on the X server, regardless of whether -sync is specified. Much of that appears to be required in order to sup-
port direct client invocation of glutMainLoopEvent(), regrettably. However, if one calls glutMainLoop(), instead, we might avoid gratuitous
XFlush() calls. (That last sentence isn't particularly germain to this function, but there's no better place to make this remark at this
time.) Even for glutMainLoopEvent(), we may be able to coalesce many XFlush() calls.
SEE ALSO glutInitWindowPosition(3)glutInitWindowSize(3)glutInitDisplayMode(3)glutInitDisplayString(3)glutCreateWindow(3)glutDisplayFunc(3)glutMainLoop(3)glutMainLoopEvent(3)glutReportErrors(3)glutSwapBuffers(3)
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