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.
32 #define G_LOG_DOMAIN "freeglut-init"
34 #include "../include/GL/freeglut.h"
35 #include "freeglut_internal.h"
38 * TODO BEFORE THE STABLE RELEASE:
40 * fgDeinitialize() -- Win32's OK, X11 needs the OS-specific deinitialization done
41 * glutInitDisplayString() -- display mode string parsing
43 * Wouldn't it be cool to use gettext() for error messages? I just love bash saying
44 * "nie znaleziono pliku" instead of "file not found" :) Is gettext easily portable?
47 /* -- GLOBAL VARIABLES ----------------------------------------------------- */
50 * A structure pointed by g_pDisplay holds all information
51 * regarding the display, screen, root window etc.
53 SFG_Display fgDisplay;
56 * The settings for the current freeglut session
58 SFG_State fgState = { { -1, -1, FALSE }, /* Position */
59 { 300, 300, TRUE }, /* Size */
60 GLUT_RGBA | GLUT_SINGLE | GLUT_DEPTH, /* DisplayMode */
61 FALSE, /* ForceDirectContext */
62 TRUE, /* TryDirectContext */
63 FALSE, /* ForceIconic */
64 FALSE, /* UseCurrentContext */
65 FALSE, /* GLDebugSwitch */
66 FALSE, /* XSyncSwitch */
67 TRUE, /* IgnoreKeyRepeat */
71 #ifdef TARGET_HOST_WIN32
72 { 0, FALSE }, /* Time */
76 { NULL, NULL }, /* Timers */
77 NULL, /* IdleCallback */
78 NULL, /* MenuStateCallback */
79 NULL, /* MenuStatusCallback */
80 { 640, 480, TRUE }, /* GameModeSize */
81 16, /* GameModeDepth */
82 72, /* GameModeRefresh */
83 GLUT_ACTION_EXIT, /* ActionOnWindowClose */
84 GLUT_EXEC_STATE_INIT /* ExecState */
88 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
91 * A call to this function should initialize all the display stuff...
93 void fgInitialize( const char* displayName )
95 #if TARGET_HOST_UNIX_X11
97 * Have the display created
99 fgDisplay.Display = XOpenDisplay( displayName );
101 if( fgDisplay.Display == NULL )
104 * Failed to open a display. That's no good.
106 fgError( "failed to open display '%s'", XDisplayName( displayName ) );
110 * Check for the OpenGL GLX extension availability:
112 if( !glXQueryExtension( fgDisplay.Display, NULL, NULL ) )
115 * GLX extensions have not been found...
117 fgError( "OpenGL GLX extension not supported by display '%s'", XDisplayName( displayName ) );
121 * Grab the default screen for the display we have just opened
123 fgDisplay.Screen = DefaultScreen( fgDisplay.Display );
126 * The same applying to the root window
128 fgDisplay.RootWindow = RootWindow(
134 * Grab the logical screen's geometry
136 fgDisplay.ScreenWidth = DisplayWidth(
141 fgDisplay.ScreenHeight = DisplayHeight(
147 * Grab the physical screen's geometry
149 fgDisplay.ScreenWidthMM = DisplayWidthMM(
154 fgDisplay.ScreenHeightMM = DisplayHeightMM(
160 * The display's connection number
162 fgDisplay.Connection = ConnectionNumber( fgDisplay.Display );
165 * Create the window deletion atom
167 fgDisplay.DeleteWindow = XInternAtom(
173 #elif TARGET_HOST_WIN32
179 * What we need to do is to initialize the fgDisplay global structure here...
181 fgDisplay.Instance = GetModuleHandle( NULL );
184 * Check if the freeglut window class has been registered before...
186 atom = GetClassInfo( fgDisplay.Instance, "FREEGLUT", &wc );
189 * ...nope, it has not, and we have to do it right now:
194 * Make sure the unitialized fields are reset to zero
196 ZeroMemory( &wc, sizeof(WNDCLASS) );
199 * Each of the windows should have its own device context...
202 wc.lpfnWndProc = fgWindowProc;
205 wc.hInstance = fgDisplay.Instance;
206 wc.hIcon = LoadIcon( fgDisplay.Instance, "GLUT_ICON" );
208 wc.hIcon = LoadIcon( NULL, IDI_WINLOGO );
210 wc.hCursor = LoadCursor( NULL, IDC_ARROW );
211 wc.hbrBackground = NULL;
212 wc.lpszMenuName = NULL;
213 wc.lpszClassName = "FREEGLUT";
216 * Register the window class
218 atom = RegisterClass( &wc );
223 * The screen dimensions can be obtained via GetSystemMetrics() calls
225 fgDisplay.ScreenWidth = GetSystemMetrics( SM_CXSCREEN );
226 fgDisplay.ScreenHeight = GetSystemMetrics( SM_CYSCREEN );
230 * Checking the display's size in millimeters isn't too hard, too:
232 HWND desktop = GetDesktopWindow();
233 HDC context = GetDC( desktop );
236 * Grab the appropriate values now (HORZSIZE and VERTSIZE respectably):
238 fgDisplay.ScreenWidthMM = GetDeviceCaps( context, HORZSIZE );
239 fgDisplay.ScreenHeightMM = GetDeviceCaps( context, VERTSIZE );
242 * Whoops, forgot to release the device context :)
244 ReleaseDC( desktop, context );
250 * Have the joystick device initialized now
256 * Perform the freeglut deinitialization...
258 void fgDeinitialize( void )
263 * Check if initialization has been performed before
265 if( !fgState.Time.Set )
267 fgWarning( "fgDeinitialize(): fgState.Timer is null => no valid initialization has been performed" );
272 * Perform the freeglut structure deinitialization
274 fgDestroyStructure();
277 * Delete all the timers and their storage list
279 while ( (timer = fgState.Timers.First) != NULL )
281 fgListRemove ( &fgState.Timers, &timer->Node ) ;
286 * Deinitialize the joystick device
291 * Reset the state structure
294 fgState.Position.X = -1 ;
295 fgState.Position.Y = -1 ;
296 fgState.Position.Use = FALSE ;
298 fgState.Size.X = 300 ;
299 fgState.Size.Y = 300 ;
300 fgState.Size.Use = TRUE ;
303 * The default display mode to be used
305 fgState.DisplayMode = GLUT_RGBA | GLUT_SINGLE | GLUT_DEPTH;
307 fgState.ForceDirectContext = FALSE;
308 fgState.TryDirectContext = TRUE;
309 fgState.ForceIconic = FALSE;
310 fgState.UseCurrentContext = FALSE;
311 fgState.GLDebugSwitch = FALSE;
312 fgState.XSyncSwitch = FALSE;
313 fgState.ActionOnWindowClose = GLUT_ACTION_EXIT ;
314 fgState.ExecState = GLUT_EXEC_STATE_INIT ;
317 * Assume we want to ignore the automatic key repeat
319 fgState.IgnoreKeyRepeat = TRUE;
322 * Set the default game mode settings
324 fgState.GameModeSize.X = 640;
325 fgState.GameModeSize.Y = 480;
326 fgState.GameModeDepth = 16;
327 fgState.GameModeRefresh = 72;
329 fgState.Time.Set = FALSE ;
331 fgState.Timers.First = fgState.Timers.Last = NULL ;
332 fgState.IdleCallback = NULL ;
333 fgState.MenuStateCallback = (FGCBmenuState)NULL ;
334 fgState.MenuStatusCallback = (FGCBmenuStatus)NULL ;
339 fgState.SwapCount = 0;
340 fgState.SwapTime = 0;
341 fgState.FPSInterval = 0;
344 #if TARGET_HOST_UNIX_X11
347 * Make sure all X-client data we have created will be destroyed on display closing
349 XSetCloseDownMode( fgDisplay.Display, DestroyAll );
352 * Close the display connection, destroying all windows we have created so far
354 XCloseDisplay( fgDisplay.Display );
360 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
363 * Perform initialization. This usually happens on the program startup
364 * and restarting after glutMainLoop termination...
366 void FGAPIENTRY glutInit( int* pargc, char** argv )
368 char* displayName = NULL;
369 int i, j, argc = *pargc;
372 * Do not allow multiple initialization of the library
374 if( fgState.Time.Set )
377 * We can't have multiple initialization performed
379 fgError( "illegal glutInit() reinitialization attemp" );
383 * Have the internal freeglut structure initialized now
388 * Remember the function's call time
390 #if TARGET_HOST_UNIX_X11
391 gettimeofday(&fgState.Time.Value, NULL);
392 #elif TARGET_HOST_WIN32
393 fgState.Time.Value = timeGetTime();
395 fgState.Time.Set = TRUE;
397 /* check if GLUT_FPS env var is set */
399 const char *fps = getenv ( "GLUT_FPS" );
402 sscanf ( fps, "%d", &fgState.FPSInterval ) ;
403 if ( fgState.FPSInterval <= 0 )
404 fgState.FPSInterval = 5000 ; /* 5000 milliseconds */
409 * Grab the environment variable indicating the X display to use.
410 * This is harmless under Win32, so let's let it stay here...
412 #if TARGET_HOST_WIN32
413 if ( !getenv ( "DISPLAY" ) )
414 displayName = strdup ( "" ) ;
417 displayName = strdup( getenv( "DISPLAY" ) );
420 * Have the program arguments parsed.
422 for( i=1; i<argc; i++ )
425 * The X display name settings
427 if( strcmp( argv[ i ], "-display" ) == 0 )
430 * Check for possible lack of the next argument
433 fgError( "-display parameter must be followed by display name" );
436 * Release the previous display name (the one from app's environment)
441 * Make a working copy of the name for us to use
443 displayName = strdup( argv[ i ] );
446 * Have both arguments removed
448 argv[ i - 1 ] = NULL;
454 * The geometry settings
456 else if( strcmp( argv[ i ], "-geometry" ) == 0 )
462 * Again, check if there is at least one more argument
465 fgError( "-geometry parameter must be followed by window geometry settings" );
468 * Otherwise scan the geometry settings...
470 result = sscanf ( argv[i], "%dx%d+%d+%d", &x, &y, &w, &h );
473 * Check what we have been supplied with...
484 fgState.Position.Y = fgDisplay.ScreenHeight + y - fgState.Size.Y;
486 fgState.Position.Y = y;
492 fgState.Position.X = fgDisplay.ScreenWidth + x - fgState.Size.X;
494 fgState.Position.X = x;
498 * Have both arguments removed
500 argv[ i - 1 ] = NULL;
506 * The direct/indirect OpenGL contexts settings
508 else if( strcmp( argv[ i ], "-direct" ) == 0)
511 * We try to force direct rendering...
513 if( fgState.TryDirectContext == FALSE )
514 fgError( "parameters ambiguity, -direct and -indirect cannot be both specified" );
516 fgState.ForceDirectContext = TRUE;
520 else if( strcmp( argv[ i ], "-indirect" ) == 0 )
523 * We try to force indirect rendering...
525 if( fgState.ForceDirectContext == TRUE )
526 fgError( "parameters ambiguity, -direct and -indirect cannot be both specified" );
528 fgState.TryDirectContext = FALSE;
534 * The '-iconic' parameter makes all new top-level
535 * windows created in iconified state...
537 else if( strcmp( argv[ i ], "-iconic" ) == 0 )
539 fgState.ForceIconic = TRUE;
545 * The '-gldebug' option activates some OpenGL state debugging features
547 else if( strcmp( argv[ i ], "-gldebug" ) == 0 )
549 fgState.GLDebugSwitch = TRUE;
555 * The '-sync' option activates X protocol synchronization (for debugging purposes)
557 else if( strcmp( argv[ i ], "-sync" ) == 0 )
559 fgState.XSyncSwitch = TRUE;
566 * Have the arguments list compacted now
569 for( i = 1; i < *pargc; i++, j++ )
571 if( argv[ i ] == NULL )
573 while ( argv[j] == NULL ) j++ ; /* Guaranteed to end because there are "*pargc" arguments left */
579 * Have the display created now. As I am too lazy to implement
580 * the program arguments parsing, we will have the DISPLAY
581 * environment variable used for opening the X display:
583 fgInitialize( displayName );
586 * Check for the minus one settings for both position and size...
588 if( fgState.Position.X < 0 || fgState.Position.Y < 0 )
589 fgState.Position.Use = FALSE;
591 if( fgState.Size.X < 0 || fgState.Size.Y < 0 )
592 fgState.Size.Use = FALSE;
595 * Do not forget about releasing the display name string
601 * Sets the default initial window position for new windows
603 void FGAPIENTRY glutInitWindowPosition( int x, int y )
606 * The settings can be disables when both coordinates are negative
608 if( (x >= 0) && (y >= 0) )
611 * We want to specify the initial position of each of the windows
613 fgState.Position.X = x;
614 fgState.Position.Y = y;
615 fgState.Position.Use = TRUE;
620 * The initial position of each of the windows is specified by the wm
622 fgState.Position.X = -1;
623 fgState.Position.Y = -1;
624 fgState.Position.Use = FALSE;
629 * Sets the default initial window size for new windows
631 void FGAPIENTRY glutInitWindowSize( int width, int height )
634 * The settings can be disables when both values are negative
636 if( (width > 0) && (height > 0) )
639 * We want to specify the initial size of each of the windows
641 fgState.Size.X = width;
642 fgState.Size.Y = height;
643 fgState.Size.Use = TRUE;
648 * The initial size of each of the windows is specified by the wm (officially this is an error condition)
652 fgState.Size.Use = FALSE;
657 * Sets the default display mode for all new windows
659 void FGAPIENTRY glutInitDisplayMode( unsigned int displayMode )
662 * We will make use of this value when creating a new OpenGL context...
664 fgState.DisplayMode = displayMode;
668 /* -- INIT DISPLAY STRING PARSING ------------------------------------------ */
670 #if 0 /* FIXME: CJP */
672 * There is a discrete number of comparison operators we can encounter:
674 * comparison ::= "=" | "!=" | "<" | ">" | "<=" | ">=" | "~"
676 #define FG_NONE 0x0000
677 #define FG_EQUAL 0x0001
678 #define FG_NOT_EQUAL 0x0002
679 #define FG_LESS 0x0003
680 #define FG_MORE 0x0004
681 #define FG_LESS_OR_EQUAL 0x0005
682 #define FG_MORE_OR_EQUAL 0x0006
683 #define FG_CLOSEST 0x0007
686 * The caller can feed us with a number of capability tokens:
688 * capability ::= "alpha" | "acca" | "acc" | "blue" | "buffer" | "conformant" | "depth" | "double" |
689 * "green" | "index" | "num" | "red" | "rgba" | "rgb" | "luminance" | "stencil" |
690 * "single" | "stereo" | "samples" | "slow" | "win32pdf" | "xvisual" | "xstaticgray" |
691 * "xgrayscale" | "xstaticcolor" | "xpseudocolor" | "xtruecolor" | "xdirectcolor"
693 static gchar* g_Tokens[] =
695 "none", "alpha", "acca", "acc", "blue", "buffer", "conformant", "depth", "double", "green",
696 "index", "num", "red", "rgba", "rgb", "luminance", "stencil", "single", "stereo", "samples",
697 "slow", "win32pdf", "xvisual", "xstaticgray", "xgrayscale", "xstaticcolor", "xpseudocolor",
698 "xtruecolor", "xdirectcolor", NULL
702 * The structure to hold the parsed display string tokens
704 typedef struct tagSFG_Capability SFG_Capability;
705 struct tagSFG_Capability
707 gint capability; /* the capability token enumerator */
708 gint comparison; /* the comparison operator used */
709 gint value; /* the value we're comparing to */
713 * The scanner configuration for the init display string
715 static GScannerConfig fgInitDisplayStringScannerConfig =
717 ( " \t\r\n" ) /* cset_skip_characters */,
722 ) /* cset_identifier_first */,
730 ) /* cset_identifier_nth */,
731 ( "#\n" ) /* cpair_comment_single */,
732 FALSE /* case_sensitive */,
733 TRUE /* skip_comment_multi */,
734 TRUE /* skip_comment_single */,
735 TRUE /* scan_comment_multi */,
736 TRUE /* scan_identifier */,
737 FALSE /* scan_identifier_1char */,
738 FALSE /* scan_identifier_NULL */,
739 TRUE /* scan_symbols */,
740 FALSE /* scan_binary */,
741 TRUE /* scan_octal */,
742 TRUE /* scan_float */,
744 FALSE /* scan_hex_dollar */,
745 TRUE /* scan_string_sq */,
746 TRUE /* scan_string_dq */,
747 TRUE /* numbers_2_int */,
748 FALSE /* int_2_float */,
749 FALSE /* identifier_2_string */,
750 TRUE /* char_2_token */,
751 FALSE /* symbol_2_token */,
752 FALSE /* scope_0_fallback */,
756 * Sets the default display mode for all new windows using a string
758 void FGAPIENTRY glutInitDisplayString( char* displayMode )
761 * display_string ::= (switch)
762 * switch ::= capability [comparison value]
763 * comparison ::= "=" | "!=" | "<" | ">" | "<=" | ">=" | "~"
764 * capability ::= "alpha" | "acca" | "acc" | "blue" | "buffer" | "conformant" |
765 * "depth" | "double" | "green" | "index" | "num" | "red" | "rgba" |
766 * "rgb" | "luminance" | "stencil" | "single" | "stereo" |
767 * "samples" | "slow" | "win32pdf" | "xvisual" | "xstaticgray" |
768 * "xgrayscale" | "xstaticcolor" | "xpseudocolor" |
769 * "xtruecolor" | "xdirectcolor"
770 * value ::= 0..9 [value]
772 * The display string grammar. This should be EBNF, but I couldn't find the definitions so, to
773 * clarify: (expr) means 0 or more times the expression, [expr] means 0 or 1 times expr.
775 * Create a new GLib lexical analyzer to process the display mode string
777 GScanner* scanner = g_scanner_new( &fgInitDisplayStringScannerConfig );
782 * Fail if the display mode string is empty or the scanner failed to initialize
784 freeglut_return_if_fail( (scanner != NULL) && (strlen( displayMode ) > 0) );
787 * Set the scanner's input name (for debugging)
789 scanner->input_name = "glutInitDisplayString";
792 * Start the lexical analysis of the extensions string
794 g_scanner_input_text( scanner, displayMode, strlen( displayMode ) );
797 * While there are any more tokens to be checked...
799 while( !g_scanner_eof( scanner ) )
802 * Actually we're expecting only string tokens
804 GTokenType tokenType = g_scanner_get_next_token( scanner );
807 * We are looking for identifiers
809 if( tokenType == G_TOKEN_IDENTIFIER )
811 gchar* capability = NULL; /* the capability identifier string (always present) */
812 gint capID = 0; /* the capability identifier value (from g_Tokens) */
813 gint comparison = 0; /* the comparison operator value, see definitions */
814 gchar* valueString = NULL; /* if the previous one is present, this is needed */
815 gint value = 0; /* the integer value converted using a strtol call */
816 SFG_Capability* capStruct; /* the capability description structure */
819 * OK. The general rule of thumb that we always should be getting a capability identifier
820 * string (see the grammar description). If it is followed by a comparison identifier, then
821 * there must follow an integer value we're comparing the capability to...
823 * Have the current token analyzed with that in mind...
825 for( i=0; i<(gint) strlen( scanner->value.v_identifier ); i++ )
827 gchar c = scanner->value.v_identifier[ i ];
829 if( (c == '=') || (c == '!') || (c == '<') || (c == '>') || (c == '~') )
834 * Here we go with the length of the capability identifier string.
835 * In the worst of cases, it is as long as the token identifier.
837 capability = g_strndup( scanner->value.v_identifier, i );
840 * OK. Is there a chance for comparison and value identifiers to follow?
841 * Note: checking against i+1 as this handles two cases: single character
842 * comparison operator and first of value's digits, which must always be
843 * there, or the two-character comparison operators.
845 if( (i + 1) < (gint) strlen( scanner->value.v_identifier ) )
848 * Yeah, indeed, it is the i-th character to start the identifier, then.
850 gchar c1 = scanner->value.v_identifier[ i + 0 ];
851 gchar c2 = scanner->value.v_identifier[ i + 1 ];
853 if( (c1 == '=') ) { i += 1; comparison = FG_EQUAL; } else
854 if( (c1 == '!') && (c2 == '=') ) { i += 2; comparison = FG_NOT_EQUAL; } else
855 if( (c1 == '<') && (c2 == '=') ) { i += 2; comparison = FG_LESS_OR_EQUAL; } else
856 if( (c1 == '>') && (c2 == '=') ) { i += 2; comparison = FG_MORE_OR_EQUAL; } else
857 if( (c1 == '<') ) { i += 1; comparison = FG_LESS; } else
858 if( (c1 == '>') ) { i += 1; comparison = FG_MORE; } else
859 if( (c1 == '~') ) { i += 1; comparison = FG_CLOSEST; } else
860 g_warning( "invalid comparison operator in token `%s'", scanner->value.v_identifier );
864 * Grab the value string that must follow the comparison operator...
866 if( comparison != FG_NONE && i < (gint) strlen( scanner->value.v_identifier ) )
867 valueString = strdup( scanner->value.v_identifier + i );
870 * If there was a value string, convert it to integer...
872 if( comparison != FG_NONE && strlen( valueString ) > 0 )
873 value = strtol( valueString, NULL, 0 );
876 * Now we need to match the capability string and its ID
878 for( i=0; g_Tokens[ i ]!=NULL; i++ )
880 if( strcmp( capability, g_Tokens[ i ] ) == 0 )
883 * Looks like we've found the one we were looking for
891 * Create a new capability description structure
893 capStruct = g_new0( SFG_Capability, 1 );
896 * Fill in the cap's values, as we have parsed it:
898 capStruct->capability = capID;
899 capStruct->comparison = comparison;
900 capStruct->value = value;
903 * Add the new capabaility to the caps list
905 caps = g_list_append( caps, capStruct );
908 * Clean up the local mess and keep rolling on
910 g_free( valueString );
911 g_free( capability );
916 * Now that we have converted the string into somewhat more machine-friendly
917 * form, proceed with matching the frame buffer configuration...
919 * The caps list could be passed to a function that would try finding the closest
920 * matching pixel format, visual, frame buffer configuration or whatever. It would
921 * be good to convert the glutInitDisplayMode() to use the same method.
924 g_message( "found %i capability preferences", g_list_length( caps ) );
926 g_message( "token `%s': cap: %i, com: %i, val: %i",
927 scanner->value.v_identifier,
928 capStruct->capability,
929 capStruct->comparison,
935 * Free the capabilities we have parsed
937 for( i=0; i<(gint) g_list_length( caps ); i++ )
938 g_free( g_list_nth( caps, i )->data );
941 * Destroy the capabilities list itself
946 * Free the lexical scanner now...
948 g_scanner_destroy( scanner );
952 #define NUM_TOKENS 28
953 static char* Tokens[] =
955 "alpha", "acca", "acc", "blue", "buffer", "conformant", "depth", "double", "green",
956 "index", "num", "red", "rgba", "rgb", "luminance", "stencil", "single", "stereo", "samples",
957 "slow", "win32pdf", "xvisual", "xstaticgray", "xgrayscale", "xstaticcolor", "xpseudocolor",
958 "xtruecolor", "xdirectcolor"
961 static int TokenLengths[] =
963 5, 4, 3, 4, 6, 10, 5, 6, 5,
964 5, 3, 3, 4, 3, 9, 7, 6, 6, 7,
965 4, 8, 7, 11, 10, 12, 12,
969 void FGAPIENTRY glutInitDisplayString( const char* displayMode )
971 int glut_state_flag = 0 ;
973 * Unpack a lot of options from a character string. The options are delimited by blanks or tabs.
976 int len = strlen ( displayMode ) ;
977 char *buffer = malloc ( (len+1) * sizeof(char) ) ;
978 memcpy ( buffer, displayMode, len ) ;
981 token = strtok ( buffer, " \t" ) ;
988 for ( i = 0; i < NUM_TOKENS; i++ )
990 if ( strncmp ( token, Tokens[i], TokenLengths[i] ) == 0 ) break ;
995 case 0 : /* "alpha": Alpha color buffer precision in bits */
996 glut_state_flag |= GLUT_ALPHA ; /* Somebody fix this for me! */
999 case 1 : /* "acca": Red, green, blue, and alpha accumulation buffer precision in bits */
1002 case 2 : /* "acc": Red, green, and blue accumulation buffer precision in bits with zero bits alpha */
1003 glut_state_flag |= GLUT_ACCUM ; /* Somebody fix this for me! */
1006 case 3 : /* "blue": Blue color buffer precision in bits */
1009 case 4 : /* "buffer": Number of bits in the color index color buffer */
1012 case 5 : /* "conformant": Boolean indicating if the frame buffer configuration is conformant or not */
1015 case 6 : /* "depth": Number of bits of precsion in the depth buffer */
1016 glut_state_flag |= GLUT_DEPTH ; /* Somebody fix this for me! */
1019 case 7 : /* "double": Boolean indicating if the color buffer is double buffered */
1020 glut_state_flag |= GLUT_DOUBLE ;
1023 case 8 : /* "green": Green color buffer precision in bits */
1026 case 9 : /* "index": Boolean if the color model is color index or not */
1027 glut_state_flag |= GLUT_INDEX ;
1030 case 10 : /* "num": A special capability name indicating where the value represents the Nth frame buffer configuration matching the description string */
1033 case 11 : /* "red": Red color buffer precision in bits */
1036 case 12 : /* "rgba": Number of bits of red, green, blue, and alpha in the RGBA color buffer */
1037 glut_state_flag |= GLUT_RGBA ; /* Somebody fix this for me! */
1040 case 13 : /* "rgb": Number of bits of red, green, and blue in the RGBA color buffer with zero bits alpha */
1041 glut_state_flag |= GLUT_RGB ; /* Somebody fix this for me! */
1044 case 14 : /* "luminance": Number of bits of red in the RGBA and zero bits of green, blue (alpha not specified) of color buffer precision */
1045 glut_state_flag |= GLUT_LUMINANCE ; /* Somebody fix this for me! */
1048 case 15 : /* "stencil": Number of bits in the stencil buffer */
1049 glut_state_flag |= GLUT_STENCIL ; /* Somebody fix this for me! */
1052 case 16 : /* "single": Boolean indicate the color buffer is single buffered */
1053 glut_state_flag |= GLUT_SINGLE ;
1056 case 17 : /* "stereo": Boolean indicating the color buffer supports OpenGL-style stereo */
1057 glut_state_flag |= GLUT_STEREO ;
1060 case 18 : /* "samples": Indicates the number of multisamples to use based on GLX's SGIS_multisample extension (for antialiasing) */
1061 glut_state_flag |= GLUT_MULTISAMPLE ; /* Somebody fix this for me! */
1064 case 19 : /* "slow": Boolean indicating if the frame buffer configuration is slow or not */
1067 case 20 : /* "win32pdf": matches the Win32 Pixel Format Descriptor by number */
1068 #ifdef TARGET_HOST_WIN32
1072 case 21 : /* "xvisual": matches the X visual ID by number */
1073 #ifdef TARGET_HOST_UNIX_X11
1077 case 22 : /* "xstaticgray": boolean indicating if the frame buffer configuration's X visual is of type StaticGray */
1078 #ifdef TARGET_HOST_UNIX_X11
1082 case 23 : /* "xgrayscale": boolean indicating if the frame buffer configuration's X visual is of type GrayScale */
1083 #ifdef TARGET_HOST_UNIX_X11
1087 case 24 : /* "xstaticcolor": boolean indicating if the frame buffer configuration's X visual is of type StaticColor */
1088 #ifdef TARGET_HOST_UNIX_X11
1092 case 25 : /* "xpseudocolor": boolean indicating if the frame buffer configuration's X visual is of type PseudoColor */
1093 #ifdef TARGET_HOST_UNIX_X11
1097 case 26 : /* "xtruecolor": boolean indicating if the frame buffer configuration's X visual is of type TrueColor */
1098 #ifdef TARGET_HOST_UNIX_X11
1102 case 27 : /* "xdirectcolor": boolean indicating if the frame buffer configuration's X visual is of type DirectColor */
1103 #ifdef TARGET_HOST_UNIX_X11
1107 case 28 : /* Unrecognized */
1108 printf ( "WARNING - Display string token not recognized: %s\n", token ) ;
1112 token = strtok ( NULL, " \t" ) ;
1118 * We will make use of this value when creating a new OpenGL context...
1120 fgState.DisplayMode = glut_state_flag;
1123 /*** END OF FILE ***/