4 * Various freeglut initialization functions.
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Thu Dec 2 1999
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
24 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 #define FREEGLUT_BUILDING_LIB
29 #include <GL/freeglut.h>
30 #include "freeglut_internal.h"
32 #if TARGET_HOST_POSIX_X11
33 #include <limits.h> /* LONG_MAX */
37 * TODO BEFORE THE STABLE RELEASE:
39 * fgDeinitialize() -- Win32's OK, X11 needs the OS-specific
40 * deinitialization done
41 * glutInitDisplayString() -- display mode string parsing
43 * Wouldn't it be cool to use gettext() for error messages? I just love
44 * bash saying "nie znaleziono pliku" instead of "file not found" :)
45 * Is gettext easily portable?
48 /* -- GLOBAL VARIABLES ----------------------------------------------------- */
51 * A structure pointed by g_pDisplay holds all information
52 * regarding the display, screen, root window etc.
54 SFG_Display fgDisplay;
57 * The settings for the current freeglut session
59 SFG_State fgState = { { -1, -1, GL_FALSE }, /* Position */
60 { 300, 300, GL_TRUE }, /* Size */
61 GLUT_RGBA | GLUT_SINGLE | GLUT_DEPTH, /* DisplayMode */
62 GL_FALSE, /* Initialised */
63 GLUT_TRY_DIRECT_CONTEXT, /* DirectContext */
64 GL_FALSE, /* ForceIconic */
65 GL_FALSE, /* UseCurrentContext */
66 GL_FALSE, /* GLDebugSwitch */
67 GL_FALSE, /* XSyncSwitch */
68 GLUT_KEY_REPEAT_ON, /* KeyRepeat */
69 INVALID_MODIFIERS, /* Modifiers */
74 { NULL, NULL }, /* Timers */
75 { NULL, NULL }, /* FreeTimers */
76 NULL, /* IdleCallback */
78 NULL, /* MenuStateCallback */
79 NULL, /* MenuStatusCallback */
80 { 640, 480, GL_TRUE }, /* GameModeSize */
81 16, /* GameModeDepth */
82 72, /* GameModeRefresh */
83 GLUT_ACTION_EXIT, /* ActionOnWindowClose */
84 GLUT_EXEC_STATE_INIT, /* ExecState */
85 NULL, /* ProgramName */
86 GL_FALSE, /* JoysticksInitialised */
87 0, /* NumActiveJoysticks */
88 GL_FALSE, /* InputDevsInitialised */
89 1, /* AuxiliaryBufferNumber */
94 0, /* ContextProfile */
96 NULL /* WarningFunc */
100 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
102 #if TARGET_HOST_POSIX_X11
104 /* Return the atom associated with "name". */
105 static Atom fghGetAtom(const char * name)
107 return XInternAtom(fgDisplay.Display, name, False);
111 * Check if "property" is set on "window". The property's values are returned
112 * through "data". If the property is set and is of type "type", return the
113 * number of elements in "data". Return zero otherwise. In both cases, use
114 * "Xfree()" to free "data".
116 static int fghGetWindowProperty(Window window,
119 unsigned char ** data)
122 * Caller always has to use "Xfree()" to free "data", since
123 * "XGetWindowProperty() always allocates one extra byte in prop_return
124 * [i.e. "data"] (even if the property is zero length) [..]".
127 int status; /* Returned by "XGetWindowProperty". */
130 int temp_format; /* Not used. */
131 unsigned long number_of_elements;
132 unsigned long temp_bytes_after; /* Not used. */
135 status = XGetWindowProperty(fgDisplay.Display,
148 FREEGLUT_INTERNAL_ERROR_EXIT(status == Success,
149 "XGetWindowProperty failled",
150 "fghGetWindowProperty");
152 if (type_returned != type)
154 number_of_elements = 0;
157 return number_of_elements;
160 /* Check if the window manager is NET WM compliant. */
161 static int fghNetWMSupported(void)
164 Window ** window_ptr_1;
166 int number_of_windows;
167 int net_wm_supported;
170 net_wm_supported = 0;
172 wm_check = fghGetAtom("_NET_SUPPORTING_WM_CHECK");
173 window_ptr_1 = malloc(sizeof(Window *));
176 * Check that the window manager has set this property on the root window.
177 * The property must be the ID of a child window.
179 number_of_windows = fghGetWindowProperty(fgDisplay.RootWindow,
182 (unsigned char **) window_ptr_1);
183 if (number_of_windows == 1)
185 Window ** window_ptr_2;
187 window_ptr_2 = malloc(sizeof(Window *));
189 /* Check that the window has the same property set to the same value. */
190 number_of_windows = fghGetWindowProperty(**window_ptr_1,
193 (unsigned char **) window_ptr_2);
194 if ((number_of_windows == 1) && (**window_ptr_1 == **window_ptr_2))
196 /* NET WM compliant */
197 net_wm_supported = 1;
200 XFree(*window_ptr_2);
204 XFree(*window_ptr_1);
207 return net_wm_supported;
210 /* Check if "hint" is present in "property" for "window". */
211 int fgHintPresent(Window window, Atom property, Atom hint)
220 atoms_ptr = malloc(sizeof(Atom *));
221 number_of_atoms = fghGetWindowProperty(window,
224 (unsigned char **) atoms_ptr);
225 for (i = 0; i < number_of_atoms; i++)
227 if ((*atoms_ptr)[i] == hint)
237 #endif /* TARGET_HOST_POSIX_X11 */
241 * A call to this function should initialize all the display stuff...
243 static void fghInitialize( const char* displayName )
245 #if TARGET_HOST_POSIX_X11
246 fgDisplay.Display = XOpenDisplay( displayName );
248 if( fgDisplay.Display == NULL )
249 fgError( "failed to open display '%s'", XDisplayName( displayName ) );
251 if( !glXQueryExtension( fgDisplay.Display, NULL, NULL ) )
252 fgError( "OpenGL GLX extension not supported by display '%s'",
253 XDisplayName( displayName ) );
255 fgDisplay.Screen = DefaultScreen( fgDisplay.Display );
256 fgDisplay.RootWindow = RootWindow(
261 fgDisplay.ScreenWidth = DisplayWidth(
265 fgDisplay.ScreenHeight = DisplayHeight(
270 fgDisplay.ScreenWidthMM = DisplayWidthMM(
274 fgDisplay.ScreenHeightMM = DisplayHeightMM(
279 fgDisplay.Connection = ConnectionNumber( fgDisplay.Display );
281 /* Create the window deletion atom */
282 fgDisplay.DeleteWindow = fghGetAtom("WM_DELETE_WINDOW");
284 /* Create the state and full screen atoms */
285 fgDisplay.State = None;
286 fgDisplay.StateFullScreen = None;
288 if (fghNetWMSupported())
290 const Atom supported = fghGetAtom("_NET_SUPPORTED");
291 const Atom state = fghGetAtom("_NET_WM_STATE");
293 /* Check if the state hint is supported. */
294 if (fgHintPresent(fgDisplay.RootWindow, supported, state))
296 const Atom full_screen = fghGetAtom("_NET_WM_STATE_FULLSCREEN");
298 fgDisplay.State = state;
300 /* Check if the window manager supports full screen. */
301 /** Check "_NET_WM_ALLOWED_ACTIONS" on our window instead? **/
302 if (fgHintPresent(fgDisplay.RootWindow, supported, full_screen))
304 fgDisplay.StateFullScreen = full_screen;
309 #elif TARGET_HOST_MS_WINDOWS
314 /* What we need to do is to initialize the fgDisplay global structure here. */
315 fgDisplay.Instance = GetModuleHandle( NULL );
316 fgDisplay.DisplayName=strdup(displayName);
317 atom = GetClassInfo( fgDisplay.Instance, _T("FREEGLUT"), &wc );
321 ZeroMemory( &wc, sizeof(WNDCLASS) );
324 * Each of the windows should have its own device context, and we
325 * want redraw events during Vertical and Horizontal Resizes by
328 * XXX Old code had "| CS_DBCLCKS" commented out. Plans for the
329 * XXX future? Dead-end idea?
331 wc.lpfnWndProc = fgWindowProc;
334 wc.hInstance = fgDisplay.Instance;
335 wc.hIcon = LoadIcon( fgDisplay.Instance, _T("GLUT_ICON") );
337 #if defined(_WIN32_WCE)
338 wc.style = CS_HREDRAW | CS_VREDRAW;
340 wc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
342 wc.hIcon = LoadIcon( NULL, IDI_WINLOGO );
345 wc.hCursor = LoadCursor( NULL, IDC_ARROW );
346 wc.hbrBackground = NULL;
347 wc.lpszMenuName = NULL;
348 wc.lpszClassName = _T("FREEGLUT");
350 /* Register the window class */
351 atom = RegisterClass( &wc );
352 FREEGLUT_INTERNAL_ERROR_EXIT ( atom, "Window Class Not Registered", "fghInitialize" );
355 /* The screen dimensions can be obtained via GetSystemMetrics() calls */
356 fgDisplay.ScreenWidth = GetSystemMetrics( SM_CXSCREEN );
357 fgDisplay.ScreenHeight = GetSystemMetrics( SM_CYSCREEN );
360 HWND desktop = GetDesktopWindow( );
361 HDC context = GetDC( desktop );
363 fgDisplay.ScreenWidthMM = GetDeviceCaps( context, HORZSIZE );
364 fgDisplay.ScreenHeightMM = GetDeviceCaps( context, VERTSIZE );
366 ReleaseDC( desktop, context );
368 /* If we have a DisplayName try to use it for metrics */
369 if( fgDisplay.DisplayName )
371 HDC context = CreateDC(fgDisplay.DisplayName,0,0,0);
374 fgDisplay.ScreenWidth = GetDeviceCaps( context, HORZRES );
375 fgDisplay.ScreenHeight = GetDeviceCaps( context, VERTRES );
376 fgDisplay.ScreenWidthMM = GetDeviceCaps( context, HORZSIZE );
377 fgDisplay.ScreenHeightMM = GetDeviceCaps( context, VERTSIZE );
381 fgWarning("fghInitialize: "
382 "CreateDC failed, Screen size info may be incorrect\n"
383 "This is quite likely caused by a bad '-display' parameter");
386 /* Set the timer granularity to 1 ms */
387 timeBeginPeriod ( 1 );
391 fgState.Initialised = GL_TRUE;
392 atexit(fgDeinitialize);
394 /* InputDevice uses GlutTimerFunc(), so fgState.Initialised must be TRUE */
395 fgInitialiseInputDevices();
399 * Perform the freeglut deinitialization...
401 void fgDeinitialize( void )
405 if( !fgState.Initialised )
410 /* If there was a menu created, destroy the rendering context */
411 if( fgStructure.MenuContext )
413 #if TARGET_HOST_POSIX_X11
414 /* Note that the MVisualInfo is not owned by the MenuContext! */
415 glXDestroyContext( fgDisplay.Display, fgStructure.MenuContext->MContext );
417 free( fgStructure.MenuContext );
418 fgStructure.MenuContext = NULL;
421 fgDestroyStructure( );
423 while( ( timer = fgState.Timers.First) )
425 fgListRemove( &fgState.Timers, &timer->Node );
429 while( ( timer = fgState.FreeTimers.First) )
431 fgListRemove( &fgState.FreeTimers, &timer->Node );
435 #if !defined(_WIN32_WCE)
436 if ( fgState.JoysticksInitialised )
439 if ( fgState.InputDevsInitialised )
440 fgInputDeviceClose( );
441 #endif /* !defined(_WIN32_WCE) */
442 fgState.JoysticksInitialised = GL_FALSE;
443 fgState.InputDevsInitialised = GL_FALSE;
445 fgState.MajorVersion = 1;
446 fgState.MinorVersion = 0;
447 fgState.ContextFlags = 0;
448 fgState.ContextProfile = 0;
450 fgState.Initialised = GL_FALSE;
452 fgState.Position.X = -1;
453 fgState.Position.Y = -1;
454 fgState.Position.Use = GL_FALSE;
456 fgState.Size.X = 300;
457 fgState.Size.Y = 300;
458 fgState.Size.Use = GL_TRUE;
460 fgState.DisplayMode = GLUT_RGBA | GLUT_SINGLE | GLUT_DEPTH;
462 fgState.DirectContext = GLUT_TRY_DIRECT_CONTEXT;
463 fgState.ForceIconic = GL_FALSE;
464 fgState.UseCurrentContext = GL_FALSE;
465 fgState.GLDebugSwitch = GL_FALSE;
466 fgState.XSyncSwitch = GL_FALSE;
467 fgState.ActionOnWindowClose = GLUT_ACTION_EXIT;
468 fgState.ExecState = GLUT_EXEC_STATE_INIT;
470 fgState.KeyRepeat = GLUT_KEY_REPEAT_ON;
471 fgState.Modifiers = INVALID_MODIFIERS;
473 fgState.GameModeSize.X = 640;
474 fgState.GameModeSize.Y = 480;
475 fgState.GameModeDepth = 16;
476 fgState.GameModeRefresh = 72;
478 fgListInit( &fgState.Timers );
479 fgListInit( &fgState.FreeTimers );
481 fgState.IdleCallback = NULL;
482 fgState.MenuStateCallback = ( FGCBMenuState )NULL;
483 fgState.MenuStatusCallback = ( FGCBMenuStatus )NULL;
485 fgState.SwapCount = 0;
486 fgState.SwapTime = 0;
487 fgState.FPSInterval = 0;
489 if( fgState.ProgramName )
491 free( fgState.ProgramName );
492 fgState.ProgramName = NULL;
495 #if TARGET_HOST_POSIX_X11
498 * Make sure all X-client data we have created will be destroyed on
501 XSetCloseDownMode( fgDisplay.Display, DestroyAll );
504 * Close the display connection, destroying all windows we have
507 XCloseDisplay( fgDisplay.Display );
509 #elif TARGET_HOST_MS_WINDOWS
510 if( fgDisplay.DisplayName )
512 free( fgDisplay.DisplayName );
513 fgDisplay.DisplayName = NULL;
516 /* Reset the timer granularity */
521 fgState.Initialised = GL_FALSE;
525 * Everything inside the following #ifndef is copied from the X sources.
528 #if TARGET_HOST_MS_WINDOWS
532 Copyright 1985, 1986, 1987,1998 The Open Group
534 Permission to use, copy, modify, distribute, and sell this software and its
535 documentation for any purpose is hereby granted without fee, provided that
536 the above copyright notice appear in all copies and that both that
537 copyright notice and this permission notice appear in supporting
540 The above copyright notice and this permission notice shall be included
541 in all copies or substantial portions of the Software.
543 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
544 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
545 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
546 IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
547 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
548 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
549 OTHER DEALINGS IN THE SOFTWARE.
551 Except as contained in this notice, the name of The Open Group shall
552 not be used in advertising or otherwise to promote the sale, use or
553 other dealings in this Software without prior written authorization
558 #define NoValue 0x0000
559 #define XValue 0x0001
560 #define YValue 0x0002
561 #define WidthValue 0x0004
562 #define HeightValue 0x0008
563 #define AllValues 0x000F
564 #define XNegative 0x0010
565 #define YNegative 0x0020
568 * XParseGeometry parses strings of the form
569 * "=<width>x<height>{+-}<xoffset>{+-}<yoffset>", where
570 * width, height, xoffset, and yoffset are unsigned integers.
571 * Example: "=80x24+300-49"
572 * The equal sign is optional.
573 * It returns a bitmask that indicates which of the four values
574 * were actually found in the string. For each value found,
575 * the corresponding argument is updated; for each value
576 * not found, the corresponding argument is left unchanged.
580 ReadInteger(char *string, char **NextString)
582 register int Result = 0;
587 else if (*string == '-')
592 for (; (*string >= '0') && (*string <= '9'); string++)
594 Result = (Result * 10) + (*string - '0');
596 *NextString = string;
603 static int XParseGeometry (
607 unsigned int *width, /* RETURN */
608 unsigned int *height) /* RETURN */
611 register char *strind;
612 unsigned int tempWidth = 0, tempHeight = 0;
613 int tempX = 0, tempY = 0;
616 if ( (string == NULL) || (*string == '\0'))
619 string++; /* ignore possible '=' at beg of geometry spec */
621 strind = (char *)string;
622 if (*strind != '+' && *strind != '-' && *strind != 'x') {
623 tempWidth = ReadInteger(strind, &nextCharacter);
624 if (strind == nextCharacter)
626 strind = nextCharacter;
630 if (*strind == 'x' || *strind == 'X') {
632 tempHeight = ReadInteger(strind, &nextCharacter);
633 if (strind == nextCharacter)
635 strind = nextCharacter;
639 if ((*strind == '+') || (*strind == '-')) {
640 if (*strind == '-') {
642 tempX = -ReadInteger(strind, &nextCharacter);
643 if (strind == nextCharacter)
645 strind = nextCharacter;
651 tempX = ReadInteger(strind, &nextCharacter);
652 if (strind == nextCharacter)
654 strind = nextCharacter;
657 if ((*strind == '+') || (*strind == '-')) {
658 if (*strind == '-') {
660 tempY = -ReadInteger(strind, &nextCharacter);
661 if (strind == nextCharacter)
663 strind = nextCharacter;
669 tempY = ReadInteger(strind, &nextCharacter);
670 if (strind == nextCharacter)
672 strind = nextCharacter;
678 /* If strind isn't at the end of the string the it's an invalid
679 geometry specification. */
681 if (*strind != '\0') return 0;
687 if (mask & WidthValue)
689 if (mask & HeightValue)
690 *height = tempHeight;
695 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
698 * Perform initialization. This usually happens on the program startup
699 * and restarting after glutMainLoop termination...
701 void FGAPIENTRY glutInit( int* pargc, char** argv )
703 char* displayName = NULL;
704 char* geometry = NULL;
705 int i, j, argc = *pargc;
707 if( fgState.Initialised )
708 fgError( "illegal glutInit() reinitialization attempt" );
710 if (pargc && *pargc && argv && *argv && **argv)
712 fgState.ProgramName = strdup (*argv);
714 if( !fgState.ProgramName )
715 fgError ("Could not allocate space for the program's name.");
718 fgCreateStructure( );
721 fgState.Time = fgSystemTime();
723 /* check if GLUT_FPS env var is set */
726 const char *fps = getenv( "GLUT_FPS" );
731 sscanf( fps, "%d", &interval );
734 fgState.FPSInterval = 5000; /* 5000 millisecond default */
736 fgState.FPSInterval = interval;
740 displayName = getenv( "DISPLAY" );
742 for( i = 1; i < argc; i++ )
744 if( strcmp( argv[ i ], "-display" ) == 0 )
747 fgError( "-display parameter must be followed by display name" );
749 displayName = argv[ i ];
751 argv[ i - 1 ] = NULL;
755 else if( strcmp( argv[ i ], "-geometry" ) == 0 )
758 fgError( "-geometry parameter must be followed by window "
759 "geometry settings" );
761 geometry = argv[ i ];
763 argv[ i - 1 ] = NULL;
767 else if( strcmp( argv[ i ], "-direct" ) == 0)
769 if( fgState.DirectContext == GLUT_FORCE_INDIRECT_CONTEXT )
770 fgError( "parameters ambiguity, -direct and -indirect "
771 "cannot be both specified" );
773 fgState.DirectContext = GLUT_FORCE_DIRECT_CONTEXT;
777 else if( strcmp( argv[ i ], "-indirect" ) == 0 )
779 if( fgState.DirectContext == GLUT_FORCE_DIRECT_CONTEXT )
780 fgError( "parameters ambiguity, -direct and -indirect "
781 "cannot be both specified" );
783 fgState.DirectContext = GLUT_FORCE_INDIRECT_CONTEXT;
787 else if( strcmp( argv[ i ], "-iconic" ) == 0 )
789 fgState.ForceIconic = GL_TRUE;
793 else if( strcmp( argv[ i ], "-gldebug" ) == 0 )
795 fgState.GLDebugSwitch = GL_TRUE;
799 else if( strcmp( argv[ i ], "-sync" ) == 0 )
801 fgState.XSyncSwitch = GL_TRUE;
807 /* Compact {argv}. */
808 for( i = j = 1; i < *pargc; i++, j++ )
810 /* Guaranteed to end because there are "*pargc" arguments left */
811 while ( argv[ j ] == NULL )
814 argv[ i ] = argv[ j ];
817 #endif /* _WIN32_WCE */
820 * Have the display created now. If there wasn't a "-display"
821 * in the program arguments, we will use the DISPLAY environment
822 * variable for opening the X display (see code above):
824 fghInitialize( displayName );
827 * Geometry parsing deffered until here because we may need the screen
833 unsigned int parsedWidth, parsedHeight;
834 int mask = XParseGeometry( geometry,
835 &fgState.Position.X, &fgState.Position.Y,
836 &parsedWidth, &parsedHeight );
837 /* TODO: Check for overflow? */
838 fgState.Size.X = parsedWidth;
839 fgState.Size.Y = parsedHeight;
841 if( (mask & (WidthValue|HeightValue)) == (WidthValue|HeightValue) )
842 fgState.Size.Use = GL_TRUE;
844 if( mask & XNegative )
845 fgState.Position.X += fgDisplay.ScreenWidth - fgState.Size.X;
847 if( mask & YNegative )
848 fgState.Position.Y += fgDisplay.ScreenHeight - fgState.Size.Y;
850 if( (mask & (XValue|YValue)) == (XValue|YValue) )
851 fgState.Position.Use = GL_TRUE;
855 #if TARGET_HOST_MS_WINDOWS
856 void (__cdecl *__glutExitFunc)( int return_value ) = NULL;
858 void FGAPIENTRY __glutInitWithExit( int *pargc, char **argv, void (__cdecl *exit_function)(int) )
860 __glutExitFunc = exit_function;
861 glutInit(pargc, argv);
866 * Undoes all the "glutInit" stuff
868 void FGAPIENTRY glutExit ( void )
874 * Sets the default initial window position for new windows
876 void FGAPIENTRY glutInitWindowPosition( int x, int y )
878 fgState.Position.X = x;
879 fgState.Position.Y = y;
881 if( ( x >= 0 ) && ( y >= 0 ) )
882 fgState.Position.Use = GL_TRUE;
884 fgState.Position.Use = GL_FALSE;
888 * Sets the default initial window size for new windows
890 void FGAPIENTRY glutInitWindowSize( int width, int height )
892 fgState.Size.X = width;
893 fgState.Size.Y = height;
895 if( ( width > 0 ) && ( height > 0 ) )
896 fgState.Size.Use = GL_TRUE;
898 fgState.Size.Use = GL_FALSE;
902 * Sets the default display mode for all new windows
904 void FGAPIENTRY glutInitDisplayMode( unsigned int displayMode )
906 /* We will make use of this value when creating a new OpenGL context... */
907 fgState.DisplayMode = displayMode;
911 /* -- INIT DISPLAY STRING PARSING ------------------------------------------ */
913 static char* Tokens[] =
915 "alpha", "acca", "acc", "blue", "buffer", "conformant", "depth", "double",
916 "green", "index", "num", "red", "rgba", "rgb", "luminance", "stencil",
917 "single", "stereo", "samples", "slow", "win32pdf", "win32pfd", "xvisual",
918 "xstaticgray", "xgrayscale", "xstaticcolor", "xpseudocolor",
919 "xtruecolor", "xdirectcolor",
920 "xstaticgrey", "xgreyscale", "xstaticcolour", "xpseudocolour",
921 "xtruecolour", "xdirectcolour", "borderless", "aux"
923 #define NUM_TOKENS (sizeof(Tokens) / sizeof(*Tokens))
925 void FGAPIENTRY glutInitDisplayString( const char* displayMode )
927 int glut_state_flag = 0 ;
929 * Unpack a lot of options from a character string. The options are
930 * delimited by blanks or tabs.
933 size_t len = strlen ( displayMode );
934 char *buffer = (char *)malloc ( (len+1) * sizeof(char) );
935 memcpy ( buffer, displayMode, len );
938 token = strtok ( buffer, " \t" );
942 /* Process this token */
945 /* Temporary fix: Ignore any length specifications and at least
946 * process the basic token
947 * TODO: Fix this permanently
949 size_t cleanlength = strcspn ( token, "=<>~!" );
951 for ( i = 0; i < NUM_TOKENS; i++ )
953 if ( strncmp ( token, Tokens[i], cleanlength ) == 0 ) break ;
958 case 0 : /* "alpha": Alpha color buffer precision in bits */
959 glut_state_flag |= GLUT_ALPHA ; /* Somebody fix this for me! */
962 case 1 : /* "acca": Red, green, blue, and alpha accumulation buffer
966 case 2 : /* "acc": Red, green, and blue accumulation buffer precision
967 in bits with zero bits alpha */
968 glut_state_flag |= GLUT_ACCUM ; /* Somebody fix this for me! */
971 case 3 : /* "blue": Blue color buffer precision in bits */
974 case 4 : /* "buffer": Number of bits in the color index color buffer
978 case 5 : /* "conformant": Boolean indicating if the frame buffer
979 configuration is conformant or not */
982 case 6 : /* "depth": Number of bits of precsion in the depth buffer */
983 glut_state_flag |= GLUT_DEPTH ; /* Somebody fix this for me! */
986 case 7 : /* "double": Boolean indicating if the color buffer is
988 glut_state_flag |= GLUT_DOUBLE ;
991 case 8 : /* "green": Green color buffer precision in bits */
994 case 9 : /* "index": Boolean if the color model is color index or not
996 glut_state_flag |= GLUT_INDEX ;
999 case 10 : /* "num": A special capability name indicating where the
1000 value represents the Nth frame buffer configuration
1001 matching the description string */
1004 case 11 : /* "red": Red color buffer precision in bits */
1007 case 12 : /* "rgba": Number of bits of red, green, blue, and alpha in
1008 the RGBA color buffer */
1009 glut_state_flag |= GLUT_RGBA ; /* Somebody fix this for me! */
1012 case 13 : /* "rgb": Number of bits of red, green, and blue in the
1013 RGBA color buffer with zero bits alpha */
1014 glut_state_flag |= GLUT_RGB ; /* Somebody fix this for me! */
1017 case 14 : /* "luminance": Number of bits of red in the RGBA and zero
1018 bits of green, blue (alpha not specified) of color buffer
1020 glut_state_flag |= GLUT_LUMINANCE ; /* Somebody fix this for me! */
1023 case 15 : /* "stencil": Number of bits in the stencil buffer */
1024 glut_state_flag |= GLUT_STENCIL; /* Somebody fix this for me! */
1027 case 16 : /* "single": Boolean indicate the color buffer is single
1029 glut_state_flag |= GLUT_SINGLE ;
1032 case 17 : /* "stereo": Boolean indicating the color buffer supports
1033 OpenGL-style stereo */
1034 glut_state_flag |= GLUT_STEREO ;
1037 case 18 : /* "samples": Indicates the number of multisamples to use
1038 based on GLX's SGIS_multisample extension (for
1040 glut_state_flag |= GLUT_MULTISAMPLE ; /*Somebody fix this for me!*/
1043 case 19 : /* "slow": Boolean indicating if the frame buffer
1044 configuration is slow or not */
1047 case 20 : /* "win32pdf": (incorrect spelling but was there before */
1048 case 21 : /* "win32pfd": matches the Win32 Pixel Format Descriptor by
1050 #if TARGET_HOST_MS_WINDOWS
1054 case 22 : /* "xvisual": matches the X visual ID by number */
1055 #if TARGET_HOST_POSIX_X11
1059 case 23 : /* "xstaticgray": */
1060 case 29 : /* "xstaticgrey": boolean indicating if the frame buffer
1061 configuration's X visual is of type StaticGray */
1062 #if TARGET_HOST_POSIX_X11
1066 case 24 : /* "xgrayscale": */
1067 case 30 : /* "xgreyscale": boolean indicating if the frame buffer
1068 configuration's X visual is of type GrayScale */
1069 #if TARGET_HOST_POSIX_X11
1073 case 25 : /* "xstaticcolor": */
1074 case 31 : /* "xstaticcolour": boolean indicating if the frame buffer
1075 configuration's X visual is of type StaticColor */
1076 #if TARGET_HOST_POSIX_X11
1080 case 26 : /* "xpseudocolor": */
1081 case 32 : /* "xpseudocolour": boolean indicating if the frame buffer
1082 configuration's X visual is of type PseudoColor */
1083 #if TARGET_HOST_POSIX_X11
1087 case 27 : /* "xtruecolor": */
1088 case 33 : /* "xtruecolour": boolean indicating if the frame buffer
1089 configuration's X visual is of type TrueColor */
1090 #if TARGET_HOST_POSIX_X11
1094 case 28 : /* "xdirectcolor": */
1095 case 34 : /* "xdirectcolour": boolean indicating if the frame buffer
1096 configuration's X visual is of type DirectColor */
1097 #if TARGET_HOST_POSIX_X11
1101 case 35 : /* "borderless": windows should not have borders */
1102 #if TARGET_HOST_POSIX_X11
1106 case 36 : /* "aux": some number of aux buffers */
1107 glut_state_flag |= GLUT_AUX;
1110 case 37 : /* Unrecognized */
1111 fgWarning ( "WARNING - Display string token not recognized: %s",
1116 token = strtok ( NULL, " \t" );
1121 /* We will make use of this value when creating a new OpenGL context... */
1122 fgState.DisplayMode = glut_state_flag;
1125 /* -- SETTING OPENGL 3.0 CONTEXT CREATION PARAMETERS ---------------------- */
1127 void FGAPIENTRY glutInitContextVersion( int majorVersion, int minorVersion )
1129 /* We will make use of these valuse when creating a new OpenGL context... */
1130 fgState.MajorVersion = majorVersion;
1131 fgState.MinorVersion = minorVersion;
1135 void FGAPIENTRY glutInitContextFlags( int flags )
1137 /* We will make use of this value when creating a new OpenGL context... */
1138 fgState.ContextFlags = flags;
1141 void FGAPIENTRY glutInitContextProfile( int profile )
1143 /* We will make use of this value when creating a new OpenGL context... */
1144 fgState.ContextProfile = profile;
1147 /* -------------- User Defined Error/Warning Handler Support -------------- */
1150 * Sets the user error handler (note the use of va_list for the args to the fmt)
1152 void FGAPIENTRY glutInitErrorFunc( void (* vfgError) ( const char *fmt, va_list ap ) )
1154 /* This allows user programs to handle freeglut errors */
1155 fgState.ErrorFunc = vfgError;
1159 * Sets the user warning handler (note the use of va_list for the args to the fmt)
1161 void FGAPIENTRY glutInitWarningFunc( void (* vfgWarning) ( const char *fmt, va_list ap ) )
1163 /* This allows user programs to handle freeglut warnings */
1164 fgState.WarningFunc = vfgWarning;
1167 /*** END OF FILE ***/