src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 24 Feb 2004 07:42:19 +0000
changeset 853 dddfc37e1f65
parent 769 b8d311d90021
child 883 50f5a29c6a17
permissions -rw-r--r--
Don't allow video modes larger than the maximum size
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2004 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #ifdef SAVE_RCSID
    24 static char rcsid =
    25  "@(#) $Id$";
    26 #endif
    27 
    28 /* The high-level video driver subsystem */
    29 
    30 #include <stdio.h>
    31 #include <stdlib.h>
    32 #include <string.h>
    33 
    34 #include "SDL.h"
    35 #include "SDL_error.h"
    36 #include "SDL_video.h"
    37 #include "SDL_events.h"
    38 #include "SDL_mutex.h"
    39 #include "SDL_sysvideo.h"
    40 #include "SDL_sysevents.h"
    41 #include "SDL_blit.h"
    42 #include "SDL_pixels_c.h"
    43 #include "SDL_events_c.h"
    44 #include "SDL_cursor_c.h"
    45 
    46 /* Available video drivers */
    47 static VideoBootStrap *bootstrap[] = {
    48 #ifdef ENABLE_X11
    49 	&X11_bootstrap,
    50 #endif
    51 #ifdef ENABLE_DGA
    52 	&DGA_bootstrap,
    53 #endif
    54 #ifdef ENABLE_NANOX
    55 	&NX_bootstrap,
    56 #endif
    57 #ifdef ENABLE_QTOPIA
    58 	&Qtopia_bootstrap,
    59 #endif
    60 #ifdef ENABLE_FBCON
    61 	&FBCON_bootstrap,
    62 #endif
    63 #ifdef ENABLE_DIRECTFB
    64 	&DirectFB_bootstrap,
    65 #endif
    66 #ifdef ENABLE_PS2GS
    67 	&PS2GS_bootstrap,
    68 #endif
    69 #ifdef ENABLE_GGI
    70 	&GGI_bootstrap,
    71 #endif
    72 #ifdef ENABLE_VGL
    73 	&VGL_bootstrap,
    74 #endif
    75 #ifdef ENABLE_SVGALIB
    76 	&SVGALIB_bootstrap,
    77 #endif
    78 #ifdef ENABLE_AALIB
    79 	&AALIB_bootstrap,
    80 #endif
    81 #ifdef ENABLE_DIRECTX
    82 	&DIRECTX_bootstrap,
    83 #endif
    84 #ifdef ENABLE_WINDIB
    85 	&WINDIB_bootstrap,
    86 #endif
    87 #ifdef ENABLE_BWINDOW
    88 	&BWINDOW_bootstrap,
    89 #endif
    90 #ifdef ENABLE_TOOLBOX
    91 	&TOOLBOX_bootstrap,
    92 #endif
    93 #ifdef ENABLE_DRAWSPROCKET
    94 	&DSp_bootstrap,
    95 #endif
    96 #ifdef ENABLE_QUARTZ
    97 	&QZ_bootstrap,
    98 #endif
    99 #ifdef ENABLE_CYBERGRAPHICS
   100 	&CGX_bootstrap,
   101 #endif
   102 #ifdef ENABLE_PHOTON
   103 	&ph_bootstrap,
   104 #endif
   105 #ifdef ENABLE_EPOC
   106 	&EPOC_bootstrap,
   107 #endif
   108 #ifdef ENABLE_XBIOS
   109 	&XBIOS_bootstrap,
   110 #endif
   111 #ifdef ENABLE_GEM
   112 	&GEM_bootstrap,
   113 #endif
   114 #ifdef ENABLE_PICOGUI
   115 	&PG_bootstrap,
   116 #endif
   117 #ifdef ENABLE_DC
   118 	&DC_bootstrap,
   119 #endif
   120 #ifdef ENABLE_RISCOS
   121     &RISCOS_bootstrap,
   122 #endif
   123 #ifdef ENABLE_DUMMYVIDEO
   124 	&DUMMY_bootstrap,
   125 #endif
   126 	NULL
   127 };
   128 
   129 SDL_VideoDevice *current_video = NULL;
   130 
   131 /* Various local functions */
   132 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   133 void SDL_VideoQuit(void);
   134 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect* rects);
   135 
   136 static SDL_GrabMode SDL_WM_GrabInputOff(void);
   137 #ifdef HAVE_OPENGL
   138 static int lock_count = 0;
   139 #endif
   140 
   141 
   142 /*
   143  * Initialize the video and event subsystems -- determine native pixel format
   144  */
   145 int SDL_VideoInit (const char *driver_name, Uint32 flags)
   146 {
   147 	SDL_VideoDevice *video;
   148 	int index;
   149 	int i;
   150 	SDL_PixelFormat vformat;
   151 	Uint32 video_flags;
   152 
   153 	/* Toggle the event thread flags, based on OS requirements */
   154 #if defined(MUST_THREAD_EVENTS)
   155 	flags |= SDL_INIT_EVENTTHREAD;
   156 #elif defined(CANT_THREAD_EVENTS)
   157 	if ( (flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {
   158 		SDL_SetError("OS doesn't support threaded events");
   159 		return(-1);
   160 	}
   161 #endif
   162 
   163 	/* Check to make sure we don't overwrite 'current_video' */
   164 	if ( current_video != NULL ) {
   165 		SDL_VideoQuit();
   166 	}
   167 
   168 	/* Select the proper video driver */
   169 	index = 0;
   170 	video = NULL;
   171 	if ( driver_name != NULL ) {
   172 #if 0	/* This will be replaced with a better driver selection API */
   173 		if ( strrchr(driver_name, ':') != NULL ) {
   174 			index = atoi(strrchr(driver_name, ':')+1);
   175 		}
   176 #endif
   177 		for ( i=0; bootstrap[i]; ++i ) {
   178 			if ( strncmp(bootstrap[i]->name, driver_name,
   179 			             strlen(bootstrap[i]->name)) == 0 ) {
   180 				if ( bootstrap[i]->available() ) {
   181 					video = bootstrap[i]->create(index);
   182 					break;
   183 				}
   184 			}
   185 		}
   186 	} else {
   187 		for ( i=0; bootstrap[i]; ++i ) {
   188 			if ( bootstrap[i]->available() ) {
   189 				video = bootstrap[i]->create(index);
   190 				if ( video != NULL ) {
   191 					break;
   192 				}
   193 			}
   194 		}
   195 	}
   196 	if ( video == NULL ) {
   197 		SDL_SetError("No available video device");
   198 		return(-1);
   199 	}
   200 	current_video = video;
   201 	current_video->name = bootstrap[i]->name;
   202 
   203 	/* Do some basic variable initialization */
   204 	video->screen = NULL;
   205 	video->shadow = NULL;
   206 	video->visible = NULL;
   207 	video->physpal = NULL;
   208 	video->gammacols = NULL;
   209 	video->gamma = NULL;
   210 	video->wm_title = NULL;
   211 	video->wm_icon  = NULL;
   212 	video->offset_x = 0;
   213 	video->offset_y = 0;
   214 	memset(&video->info, 0, (sizeof video->info));
   215 
   216 	/* Set some very sane GL defaults */
   217 	video->gl_config.driver_loaded = 0;
   218 	video->gl_config.dll_handle = NULL;
   219 	video->gl_config.red_size = 5;
   220 #if 1 /* This seems to work on more video cards, as a default */
   221 	video->gl_config.green_size = 5;
   222 #else
   223 	video->gl_config.green_size = 6;
   224 #endif
   225 	video->gl_config.blue_size = 5;
   226 	video->gl_config.alpha_size = 0;
   227 	video->gl_config.buffer_size = 0;
   228 	video->gl_config.depth_size = 16;
   229 	video->gl_config.stencil_size = 0;
   230 	video->gl_config.double_buffer = 1;
   231 	video->gl_config.accum_red_size = 0;
   232 	video->gl_config.accum_green_size = 0;
   233 	video->gl_config.accum_blue_size = 0;
   234 	video->gl_config.accum_alpha_size = 0;
   235 	video->gl_config.stereo = 0;
   236 	video->gl_config.multisamplebuffers = 0;
   237 	video->gl_config.multisamplesamples = 0;
   238 	
   239 	/* Initialize the video subsystem */
   240 	memset(&vformat, 0, sizeof(vformat));
   241 	if ( video->VideoInit(video, &vformat) < 0 ) {
   242 		SDL_VideoQuit();
   243 		return(-1);
   244 	}
   245 
   246 	/* Create a zero sized video surface of the appropriate format */
   247 	video_flags = SDL_SWSURFACE;
   248 	SDL_VideoSurface = SDL_CreateRGBSurface(video_flags, 0, 0,
   249 				vformat.BitsPerPixel,
   250 				vformat.Rmask, vformat.Gmask, vformat.Bmask, 0);
   251 	if ( SDL_VideoSurface == NULL ) {
   252 		SDL_VideoQuit();
   253 		return(-1);
   254 	}
   255 	SDL_PublicSurface = NULL;	/* Until SDL_SetVideoMode() */
   256 
   257 #if 0 /* Don't change the current palette - may be used by other programs.
   258        * The application can't do anything with the display surface until
   259        * a video mode has been set anyway. :)
   260        */
   261 	/* If we have a palettized surface, create a default palette */
   262 	if ( SDL_VideoSurface->format->palette ) {
   263 		SDL_PixelFormat *vf = SDL_VideoSurface->format;
   264 		SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   265 		video->SetColors(video,
   266 				 0, vf->palette->ncolors, vf->palette->colors);
   267 	}
   268 #endif
   269 	video->info.vfmt = SDL_VideoSurface->format;
   270 
   271 	/* Start the event loop */
   272 	if ( SDL_StartEventLoop(flags) < 0 ) {
   273 		SDL_VideoQuit();
   274 		return(-1);
   275 	}
   276 	SDL_CursorInit(flags & SDL_INIT_EVENTTHREAD);
   277 
   278 	/* We're ready to go! */
   279 	return(0);
   280 }
   281 
   282 char *SDL_VideoDriverName(char *namebuf, int maxlen)
   283 {
   284 	if ( current_video != NULL ) {
   285 		strncpy(namebuf, current_video->name, maxlen-1);
   286 		namebuf[maxlen-1] = '\0';
   287 		return(namebuf);
   288 	}
   289 	return(NULL);
   290 }
   291 
   292 /*
   293  * Get the current display surface
   294  */
   295 SDL_Surface *SDL_GetVideoSurface(void)
   296 {
   297 	SDL_Surface *visible;
   298 
   299 	visible = NULL;
   300 	if ( current_video ) {
   301 		visible = current_video->visible;
   302 	}
   303 	return(visible);
   304 }
   305 
   306 /*
   307  * Get the current information about the video hardware
   308  */
   309 const SDL_VideoInfo *SDL_GetVideoInfo(void)
   310 {
   311 	const SDL_VideoInfo *info;
   312 
   313 	info = NULL;
   314 	if ( current_video ) {
   315 		info = &current_video->info;
   316 	}
   317 	return(info);
   318 }
   319 
   320 /*
   321  * Return a pointer to an array of available screen dimensions for the
   322  * given format, sorted largest to smallest.  Returns NULL if there are
   323  * no dimensions available for a particular format, or (SDL_Rect **)-1
   324  * if any dimension is okay for the given format.  If 'format' is NULL,
   325  * the mode list will be for the format given by SDL_GetVideoInfo()->vfmt
   326  */
   327 SDL_Rect ** SDL_ListModes (SDL_PixelFormat *format, Uint32 flags)
   328 {
   329 	SDL_VideoDevice *video = current_video;
   330 	SDL_VideoDevice *this  = current_video;
   331 	SDL_Rect **modes;
   332 
   333 	modes = NULL;
   334 	if ( SDL_VideoSurface ) {
   335 		if ( format == NULL ) {
   336 			format = SDL_VideoSurface->format;
   337 		}
   338 		modes = video->ListModes(this, format, flags);
   339 	}
   340 	return(modes);
   341 }
   342 
   343 /*
   344  * Check to see if a particular video mode is supported.
   345  * It returns 0 if the requested mode is not supported under any bit depth,
   346  * or returns the bits-per-pixel of the closest available mode with the
   347  * given width and height.  If this bits-per-pixel is different from the
   348  * one used when setting the video mode, SDL_SetVideoMode() will succeed,
   349  * but will emulate the requested bits-per-pixel with a shadow surface.
   350  */
   351 static Uint8 SDL_closest_depths[4][8] = {
   352 	/* 8 bit closest depth ordering */
   353 	{ 0, 8, 16, 15, 32, 24, 0, 0 },
   354 	/* 15,16 bit closest depth ordering */
   355 	{ 0, 16, 15, 32, 24, 8, 0, 0 },
   356 	/* 24 bit closest depth ordering */
   357 	{ 0, 24, 32, 16, 15, 8, 0, 0 },
   358 	/* 32 bit closest depth ordering */
   359 	{ 0, 32, 16, 15, 24, 8, 0, 0 }
   360 };
   361 
   362 
   363 #ifdef macintosh /* MPW optimization bug? */
   364 #define NEGATIVE_ONE 0xFFFFFFFF
   365 #else
   366 #define NEGATIVE_ONE -1
   367 #endif
   368 
   369 int SDL_VideoModeOK (int width, int height, int bpp, Uint32 flags)
   370 {
   371 	int table, b, i;
   372 	int supported;
   373 	SDL_PixelFormat format;
   374 	SDL_Rect **sizes;
   375 
   376 	/* Currently 1 and 4 bpp are not supported */
   377 	if ( bpp < 8 || bpp > 32 ) {
   378 		return(0);
   379 	}
   380 	if ( (width <= 0) || (height <= 0) ) {
   381 		return(0);
   382 	}
   383 
   384 	/* Search through the list valid of modes */
   385 	memset(&format, 0, sizeof(format));
   386 	supported = 0;
   387 	table = ((bpp+7)/8)-1;
   388 	SDL_closest_depths[table][0] = bpp;
   389 	SDL_closest_depths[table][7] = 0;
   390 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   391 		format.BitsPerPixel = SDL_closest_depths[table][b];
   392 		sizes = SDL_ListModes(&format, flags);
   393 		if ( sizes == (SDL_Rect **)0 ) {
   394 			/* No sizes supported at this bit-depth */
   395 			continue;
   396 		} else 
   397 		if (sizes == (SDL_Rect **)NEGATIVE_ONE) {
   398 			/* Any size supported at this bit-depth */
   399 			supported = 1;
   400 			continue;
   401 		} else if (current_video->handles_any_size) {
   402 			/* Driver can center a smaller surface to simulate fullscreen */
   403 			for ( i=0; sizes[i]; ++i ) {
   404 				if ((sizes[i]->w >= width) && (sizes[i]->h >= height)) {
   405 					supported = 1; /* this mode can fit the centered window. */
   406 					break;
   407 				}
   408 			}
   409 		} else
   410 		for ( i=0; sizes[i]; ++i ) {
   411 			if ((sizes[i]->w == width) && (sizes[i]->h == height)) {
   412 				supported = 1;
   413 				break;
   414 			}
   415 		}
   416 	}
   417 	if ( supported ) {
   418 		--b;
   419 		return(SDL_closest_depths[table][b]);
   420 	} else {
   421 		return(0);
   422 	}
   423 }
   424 
   425 /*
   426  * Get the closest non-emulated video mode to the one requested
   427  */
   428 static int SDL_GetVideoMode (int *w, int *h, int *BitsPerPixel, Uint32 flags)
   429 {
   430 	int table, b, i;
   431 	int supported;
   432 	int native_bpp;
   433 	SDL_PixelFormat format;
   434 	SDL_Rect **sizes;
   435 
   436 	/* Check parameters */
   437 	if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {
   438 		SDL_SetError("Invalid bits per pixel (range is {8...32})");
   439 		return(0);
   440 	}
   441 	if ((*w <= 0) || (*h <= 0)) {
   442 		SDL_SetError("Invalid width or height");
   443 		return(0);
   444 	}
   445 
   446 	/* Try the original video mode, get the closest depth */
   447 	native_bpp = SDL_VideoModeOK(*w, *h, *BitsPerPixel, flags);
   448 	if ( native_bpp == *BitsPerPixel ) {
   449 		return(1);
   450 	}
   451 	if ( native_bpp > 0 ) {
   452 		*BitsPerPixel = native_bpp;
   453 		return(1);
   454 	}
   455 
   456 	/* No exact size match at any depth, look for closest match */
   457 	memset(&format, 0, sizeof(format));
   458 	supported = 0;
   459 	table = ((*BitsPerPixel+7)/8)-1;
   460 	SDL_closest_depths[table][0] = *BitsPerPixel;
   461 	SDL_closest_depths[table][7] = SDL_VideoSurface->format->BitsPerPixel;
   462 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   463 		format.BitsPerPixel = SDL_closest_depths[table][b];
   464 		sizes = SDL_ListModes(&format, flags);
   465 		if ( sizes == (SDL_Rect **)0 ) {
   466 			/* No sizes supported at this bit-depth */
   467 			continue;
   468 		}
   469 		for ( i=0; sizes[i]; ++i ) {
   470 			if ((sizes[i]->w < *w) || (sizes[i]->h < *h)) {
   471 				if ( i > 0 ) {
   472 					--i;
   473 					*w = sizes[i]->w;
   474 					*h = sizes[i]->h;
   475 					*BitsPerPixel = SDL_closest_depths[table][b];
   476 					supported = 1;
   477 				} else {
   478 					/* Largest mode too small... */;
   479 				}
   480 				break;
   481 			}
   482 		}
   483 		if ( (i > 0) && ! sizes[i] ) {
   484 			/* The smallest mode was larger than requested, OK */
   485 			--i;
   486 			*w = sizes[i]->w;
   487 			*h = sizes[i]->h;
   488 			*BitsPerPixel = SDL_closest_depths[table][b];
   489 			supported = 1;
   490 		}
   491 	}
   492 	if ( ! supported ) {
   493 		SDL_SetError("No video mode large enough for %dx%d", *w, *h);
   494 	}
   495 	return(supported);
   496 }
   497 
   498 /* This should probably go somewhere else -- like SDL_surface.c */
   499 static void SDL_ClearSurface(SDL_Surface *surface)
   500 {
   501 	Uint32 black;
   502 
   503 	black = SDL_MapRGB(surface->format, 0, 0, 0);
   504 	SDL_FillRect(surface, NULL, black);
   505 	if ((surface->flags&SDL_HWSURFACE) && (surface->flags&SDL_DOUBLEBUF)) {
   506 		SDL_Flip(surface);
   507 		SDL_FillRect(surface, NULL, black);
   508 	}
   509 	SDL_Flip(surface);
   510 }
   511 
   512 /*
   513  * Create a shadow surface suitable for fooling the app. :-)
   514  */
   515 static void SDL_CreateShadowSurface(int depth)
   516 {
   517 	Uint32 Rmask, Gmask, Bmask;
   518 
   519 	/* Allocate the shadow surface */
   520 	if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   521 		Rmask = (SDL_VideoSurface->format)->Rmask;
   522 		Gmask = (SDL_VideoSurface->format)->Gmask;
   523 		Bmask = (SDL_VideoSurface->format)->Bmask;
   524 	} else {
   525 		Rmask = Gmask = Bmask = 0;
   526 	}
   527 	SDL_ShadowSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,
   528 				SDL_VideoSurface->w, SDL_VideoSurface->h,
   529 						depth, Rmask, Gmask, Bmask, 0);
   530 	if ( SDL_ShadowSurface == NULL ) {
   531 		return;
   532 	}
   533 
   534 	/* 8-bit shadow surfaces report that they have exclusive palette */
   535 	if ( SDL_ShadowSurface->format->palette ) {
   536 		SDL_ShadowSurface->flags |= SDL_HWPALETTE;
   537 		if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   538 			memcpy(SDL_ShadowSurface->format->palette->colors,
   539 				SDL_VideoSurface->format->palette->colors,
   540 				SDL_VideoSurface->format->palette->ncolors*
   541 							sizeof(SDL_Color));
   542 		} else {
   543 			SDL_DitherColors(
   544 			SDL_ShadowSurface->format->palette->colors, depth);
   545 		}
   546 	}
   547 
   548 	/* If the video surface is resizable, the shadow should say so */
   549 	if ( (SDL_VideoSurface->flags & SDL_RESIZABLE) == SDL_RESIZABLE ) {
   550 		SDL_ShadowSurface->flags |= SDL_RESIZABLE;
   551 	}
   552 	/* If the video surface has no frame, the shadow should say so */
   553 	if ( (SDL_VideoSurface->flags & SDL_NOFRAME) == SDL_NOFRAME ) {
   554 		SDL_ShadowSurface->flags |= SDL_NOFRAME;
   555 	}
   556 	/* If the video surface is fullscreen, the shadow should say so */
   557 	if ( (SDL_VideoSurface->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
   558 		SDL_ShadowSurface->flags |= SDL_FULLSCREEN;
   559 	}
   560 	/* If the video surface is flippable, the shadow should say so */
   561 	if ( (SDL_VideoSurface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   562 		SDL_ShadowSurface->flags |= SDL_DOUBLEBUF;
   563 	}
   564 	return;
   565 }
   566 
   567 /*
   568  * Set the requested video mode, allocating a shadow buffer if necessary.
   569  */
   570 SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)
   571 {
   572 	SDL_VideoDevice *video, *this;
   573 	SDL_Surface *prev_mode, *mode;
   574 	int video_w;
   575 	int video_h;
   576 	int video_bpp;
   577 	int is_opengl;
   578 	SDL_GrabMode saved_grab;
   579 
   580 	/* Start up the video driver, if necessary..
   581 	   WARNING: This is the only function protected this way!
   582 	 */
   583 	if ( ! current_video ) {
   584 		if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) {
   585 			return(NULL);
   586 		}
   587 	}
   588 	this = video = current_video;
   589 
   590 	/* Default to the current video bpp */
   591 	if ( bpp == 0 ) {
   592 		flags |= SDL_ANYFORMAT;
   593 		bpp = SDL_VideoSurface->format->BitsPerPixel;
   594 	}
   595 
   596 	/* Get a good video mode, the closest one possible */
   597 	video_w = width;
   598 	video_h = height;
   599 	video_bpp = bpp;
   600 	if ( ! SDL_GetVideoMode(&video_w, &video_h, &video_bpp, flags) ) {
   601 		return(NULL);
   602 	}
   603 
   604 	/* Check the requested flags */
   605 	/* There's no palette in > 8 bits-per-pixel mode */
   606 	if ( video_bpp > 8 ) {
   607 		flags &= ~SDL_HWPALETTE;
   608 	}
   609 #if 0
   610 	if ( (flags&SDL_FULLSCREEN) != SDL_FULLSCREEN ) {
   611 		/* There's no windowed double-buffering */
   612 		flags &= ~SDL_DOUBLEBUF;
   613 	}
   614 #endif
   615 	if ( (flags&SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   616 		/* Use hardware surfaces when double-buffering */
   617 		flags |= SDL_HWSURFACE;
   618 	}
   619 
   620 	is_opengl = ( ( flags & SDL_OPENGL ) == SDL_OPENGL );
   621 	if ( is_opengl ) {
   622 		/* These flags are for 2D video modes only */
   623 		flags &= ~(SDL_HWSURFACE|SDL_DOUBLEBUF);
   624 	}
   625 
   626 	/* Reset the keyboard here so event callbacks can run */
   627 	SDL_ResetKeyboard();
   628 	SDL_ResetMouse();
   629 
   630 	/* Clean up any previous video mode */
   631 	if ( SDL_PublicSurface != NULL ) {
   632 		SDL_PublicSurface = NULL;
   633 	}
   634 	if ( SDL_ShadowSurface != NULL ) {
   635 		SDL_Surface *ready_to_go;
   636 		ready_to_go = SDL_ShadowSurface;
   637 		SDL_ShadowSurface = NULL;
   638 		SDL_FreeSurface(ready_to_go);
   639 	}
   640 	if ( video->physpal ) {
   641 		free(video->physpal->colors);
   642 		free(video->physpal);
   643 		video->physpal = NULL;
   644 	}
   645 	if( video->gammacols) {
   646 		free(video->gammacols);
   647 		video->gammacols = NULL;
   648 	}
   649 
   650 	/* Save the previous grab state and turn off grab for mode switch */
   651 	saved_grab = SDL_WM_GrabInputOff();
   652 
   653 	/* Try to set the video mode, along with offset and clipping */
   654 	prev_mode = SDL_VideoSurface;
   655 	SDL_LockCursor();
   656 	SDL_VideoSurface = NULL;	/* In case it's freed by driver */
   657 	mode = video->SetVideoMode(this, prev_mode,video_w,video_h,video_bpp,flags);
   658 	if ( mode ) { /* Prevent resize events from mode change */
   659 	    SDL_PrivateResize(mode->w, mode->h);
   660 
   661 	    /* Sam - If we asked for OpenGL mode, and didn't get it, fail */
   662 	    if ( is_opengl && !(mode->flags & SDL_OPENGL) ) {
   663 		mode = NULL;
   664 	    }
   665 	}
   666 	/*
   667 	 * rcg11292000
   668 	 * If you try to set an SDL_OPENGL surface, and fail to find a
   669 	 * matching  visual, then the next call to SDL_SetVideoMode()
   670 	 * will segfault, since  we no longer point to a dummy surface,
   671 	 * but rather NULL.
   672 	 * Sam 11/29/00
   673 	 * WARNING, we need to make sure that the previous mode hasn't
   674 	 * already been freed by the video driver.  What do we do in
   675 	 * that case?  Should we call SDL_VideoInit() again?
   676 	 */
   677 	SDL_VideoSurface = (mode != NULL) ? mode : prev_mode;
   678 
   679 	if ( (mode != NULL) && (!is_opengl) ) {
   680 		/* Sanity check */
   681 		if ( (mode->w < width) || (mode->h < height) ) {
   682 			SDL_SetError("Video mode smaller than requested");
   683 			return(NULL);
   684 		}
   685 
   686 		/* If we have a palettized surface, create a default palette */
   687 		if ( mode->format->palette ) {
   688 			SDL_PixelFormat *vf = mode->format;
   689 			SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   690 			video->SetColors(this, 0, vf->palette->ncolors,
   691 			                           vf->palette->colors);
   692 		}
   693 
   694 		/* Clear the surface to black */
   695 		video->offset_x = 0;
   696 		video->offset_y = 0;
   697 		mode->offset = 0;
   698 		SDL_SetClipRect(mode, NULL);
   699 		SDL_ClearSurface(mode);
   700 
   701 		/* Now adjust the offsets to match the desired mode */
   702 		video->offset_x = (mode->w-width)/2;
   703 		video->offset_y = (mode->h-height)/2;
   704 		mode->offset = video->offset_y*mode->pitch +
   705 				video->offset_x*mode->format->BytesPerPixel;
   706 #ifdef DEBUG_VIDEO
   707   fprintf(stderr,
   708 	"Requested mode: %dx%dx%d, obtained mode %dx%dx%d (offset %d)\n",
   709 		width, height, bpp,
   710 		mode->w, mode->h, mode->format->BitsPerPixel, mode->offset);
   711 #endif
   712 		mode->w = width;
   713 		mode->h = height;
   714 		SDL_SetClipRect(mode, NULL);
   715 	}
   716 	SDL_ResetCursor();
   717 	SDL_UnlockCursor();
   718 
   719 	/* If we failed setting a video mode, return NULL... (Uh Oh!) */
   720 	if ( mode == NULL ) {
   721 		return(NULL);
   722 	}
   723 
   724 	/* If there is no window manager, set the SDL_NOFRAME flag */
   725 	if ( ! video->info.wm_available ) {
   726 		mode->flags |= SDL_NOFRAME;
   727 	}
   728 
   729 	/* Reset the mouse cursor and grab for new video mode */
   730 	SDL_SetCursor(NULL);
   731 	if ( video->UpdateMouse ) {
   732 		video->UpdateMouse(this);
   733 	}
   734 	SDL_WM_GrabInput(saved_grab);
   735 	SDL_GetRelativeMouseState(NULL, NULL); /* Clear first large delta */
   736 
   737 #ifdef HAVE_OPENGL
   738 	/* Load GL symbols (before MakeCurrent, where we need glGetString). */
   739 	if ( flags & (SDL_OPENGL | SDL_OPENGLBLIT) ) {
   740 #ifndef __QNXNTO__
   741 #define SDL_PROC(ret,func,params) \
   742 do { \
   743 	video->func = SDL_GL_GetProcAddress(#func); \
   744 	if ( ! video->func ) { \
   745 		SDL_SetError("Couldn't load GL function: %s\n", #func); \
   746 		return(NULL); \
   747 	} \
   748 } while ( 0 );
   749 #else
   750 #define SDL_PROC(ret,func,params) video->func=func;
   751 #endif /* __QNXNTO__ */
   752 #include "SDL_glfuncs.h"
   753 #undef SDL_PROC	
   754 	}
   755 #endif
   756 
   757 	/* If we're running OpenGL, make the context current */
   758 	if ( (video->screen->flags & SDL_OPENGL) &&
   759 	      video->GL_MakeCurrent ) {
   760 		if ( video->GL_MakeCurrent(this) < 0 ) {
   761 			return(NULL);
   762 		}
   763 	}
   764 
   765 	/* Set up a fake SDL surface for OpenGL "blitting" */
   766 	if ( (flags & SDL_OPENGLBLIT) == SDL_OPENGLBLIT ) {
   767 		/* Load GL functions for performing the texture updates */
   768 #ifdef HAVE_OPENGL
   769 
   770 		/* Create a software surface for blitting */
   771 #ifdef GL_VERSION_1_2
   772 		/* If the implementation either supports the packed pixels
   773 		   extension, or implements the core OpenGL 1.2 API, it will
   774 		   support the GL_UNSIGNED_SHORT_5_6_5 texture format.
   775 		 */
   776 		if ( (bpp == 16) &&
   777 		     (strstr((const char *)video->glGetString(GL_EXTENSIONS), "GL_EXT_packed_pixels") ||
   778 		     (atof((const char *)video->glGetString(GL_VERSION)) >= 1.2f))
   779 		   ) {
   780 			video->is_32bit = 0;
   781 			SDL_VideoSurface = SDL_CreateRGBSurface(
   782 				flags, 
   783 				width, 
   784 				height,  
   785 				16,
   786 				31 << 11,
   787 				63 << 5,
   788 				31,
   789 				0
   790 				);
   791 		}
   792 		else
   793 #endif /* OpenGL 1.2 */
   794 		{
   795 			video->is_32bit = 1;
   796 			SDL_VideoSurface = SDL_CreateRGBSurface(
   797 				flags, 
   798 				width, 
   799 				height, 
   800 				32, 
   801 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   802 				0x000000FF,
   803 				0x0000FF00,
   804 				0x00FF0000,
   805 				0xFF000000
   806 #else
   807 				0xFF000000,
   808 				0x00FF0000,
   809 				0x0000FF00,
   810 				0x000000FF
   811 #endif
   812 				);
   813 		}
   814 		if ( ! SDL_VideoSurface ) {
   815 			return(NULL);
   816 		}
   817 		SDL_VideoSurface->flags = mode->flags | SDL_OPENGLBLIT;
   818 
   819 		/* Free the original video mode surface (is this safe?) */
   820 		SDL_FreeSurface(mode);
   821 
   822 		/* Set the surface completely opaque & white by default */
   823 		memset( SDL_VideoSurface->pixels, 255, SDL_VideoSurface->h * SDL_VideoSurface->pitch );
   824 		video->glGenTextures( 1, &video->texture );
   825 		video->glBindTexture( GL_TEXTURE_2D, video->texture );
   826 		video->glTexImage2D(
   827 			GL_TEXTURE_2D,
   828 			0,
   829 			video->is_32bit ? GL_RGBA : GL_RGB,
   830 			256,
   831 			256,
   832 			0,
   833 			video->is_32bit ? GL_RGBA : GL_RGB,
   834 #ifdef GL_VERSION_1_2
   835 			video->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
   836 #else
   837 			GL_UNSIGNED_BYTE,
   838 #endif
   839 			NULL);
   840 
   841 		video->UpdateRects = SDL_GL_UpdateRectsLock;
   842 #else
   843 		SDL_SetError("Somebody forgot to #define HAVE_OPENGL");
   844 		return(NULL);
   845 #endif
   846 	}
   847 
   848 	/* Create a shadow surface if necessary */
   849 	/* There are three conditions under which we create a shadow surface:
   850 		1.  We need a particular bits-per-pixel that we didn't get.
   851 		2.  We need a hardware palette and didn't get one.
   852 		3.  We need a software surface and got a hardware surface.
   853 	*/
   854 	if ( !(SDL_VideoSurface->flags & SDL_OPENGL) &&
   855 	     (
   856 	     (  !(flags&SDL_ANYFORMAT) &&
   857 			(SDL_VideoSurface->format->BitsPerPixel != bpp)) ||
   858 	     (   (flags&SDL_HWPALETTE) && 
   859 				!(SDL_VideoSurface->flags&SDL_HWPALETTE)) ||
   860 		/* If the surface is in hardware, video writes are visible
   861 		   as soon as they are performed, so we need to buffer them
   862 		 */
   863 	     (   ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) &&
   864 				(SDL_VideoSurface->flags&SDL_HWSURFACE)) ||
   865 	     (   (flags&SDL_DOUBLEBUF) &&
   866 				(SDL_VideoSurface->flags&SDL_HWSURFACE) &&
   867 				!(SDL_VideoSurface->flags&SDL_DOUBLEBUF))
   868 	     ) ) {
   869 		SDL_CreateShadowSurface(bpp);
   870 		if ( SDL_ShadowSurface == NULL ) {
   871 			SDL_SetError("Couldn't create shadow surface");
   872 			return(NULL);
   873 		}
   874 		SDL_PublicSurface = SDL_ShadowSurface;
   875 	} else {
   876 		SDL_PublicSurface = SDL_VideoSurface;
   877 	}
   878 	video->info.vfmt = SDL_VideoSurface->format;
   879 
   880 	/* We're done! */
   881 	return(SDL_PublicSurface);
   882 }
   883 
   884 /* 
   885  * Convert a surface into the video pixel format.
   886  */
   887 SDL_Surface * SDL_DisplayFormat (SDL_Surface *surface)
   888 {
   889 	Uint32 flags;
   890 
   891 	if ( ! SDL_PublicSurface ) {
   892 		SDL_SetError("No video mode has been set");
   893 		return(NULL);
   894 	}
   895 	/* Set the flags appropriate for copying to display surface */
   896 	if (((SDL_PublicSurface->flags&SDL_HWSURFACE) == SDL_HWSURFACE) && current_video->info.blit_hw)
   897 		flags = SDL_HWSURFACE;
   898 	else 
   899 		flags = SDL_SWSURFACE;
   900 #ifdef AUTORLE_DISPLAYFORMAT
   901 	flags |= (surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA));
   902 	flags |= SDL_RLEACCELOK;
   903 #else
   904 	flags |= surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA|SDL_RLEACCELOK);
   905 #endif
   906 	return(SDL_ConvertSurface(surface, SDL_PublicSurface->format, flags));
   907 }
   908 
   909 /*
   910  * Convert a surface into a format that's suitable for blitting to
   911  * the screen, but including an alpha channel.
   912  */
   913 SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface)
   914 {
   915 	SDL_PixelFormat *vf;
   916 	SDL_PixelFormat *format;
   917 	SDL_Surface *converted;
   918 	Uint32 flags;
   919 	/* default to ARGB8888 */
   920 	Uint32 amask = 0xff000000;
   921 	Uint32 rmask = 0x00ff0000;
   922 	Uint32 gmask = 0x0000ff00;
   923 	Uint32 bmask = 0x000000ff;
   924 
   925 	if ( ! SDL_PublicSurface ) {
   926 		SDL_SetError("No video mode has been set");
   927 		return(NULL);
   928 	}
   929 	vf = SDL_PublicSurface->format;
   930 
   931 	switch(vf->BytesPerPixel) {
   932 	    case 2:
   933 		/* For XGY5[56]5, use, AXGY8888, where {X, Y} = {R, B}.
   934 		   For anything else (like ARGB4444) it doesn't matter
   935 		   since we have no special code for it anyway */
   936 		if ( (vf->Rmask == 0x1f) &&
   937 		     (vf->Bmask == 0xf800 || vf->Bmask == 0x7c00)) {
   938 			rmask = 0xff;
   939 			bmask = 0xff0000;
   940 		}
   941 		break;
   942 
   943 	    case 3:
   944 	    case 4:
   945 		/* Keep the video format, as long as the high 8 bits are
   946 		   unused or alpha */
   947 		if ( (vf->Rmask == 0xff) && (vf->Bmask == 0xff0000) ) {
   948 			rmask = 0xff;
   949 			bmask = 0xff0000;
   950 		}
   951 		break;
   952 
   953 	    default:
   954 		/* We have no other optimised formats right now. When/if a new
   955 		   optimised alpha format is written, add the converter here */
   956 		break;
   957 	}
   958 	format = SDL_AllocFormat(32, rmask, gmask, bmask, amask);
   959 	flags = SDL_PublicSurface->flags & SDL_HWSURFACE;
   960 	flags |= surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
   961 	converted = SDL_ConvertSurface(surface, format, flags);
   962 	SDL_FreeFormat(format);
   963 	return(converted);
   964 }
   965 
   966 /*
   967  * Update a specific portion of the physical screen
   968  */
   969 void SDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
   970 {
   971 	if ( screen ) {
   972 		SDL_Rect rect;
   973 
   974 		/* Perform some checking */
   975 		if ( w == 0 )
   976 			w = screen->w;
   977 		if ( h == 0 )
   978 			h = screen->h;
   979 		if ( (int)(x+w) > screen->w )
   980 			return;
   981 		if ( (int)(y+h) > screen->h )
   982 			return;
   983 
   984 		/* Fill the rectangle */
   985 		rect.x = x;
   986 		rect.y = y;
   987 		rect.w = w;
   988 		rect.h = h;
   989 		SDL_UpdateRects(screen, 1, &rect);
   990 	}
   991 }
   992 void SDL_UpdateRects (SDL_Surface *screen, int numrects, SDL_Rect *rects)
   993 {
   994 	int i;
   995 	SDL_VideoDevice *video = current_video;
   996 	SDL_VideoDevice *this = current_video;
   997 
   998 	if ( screen == SDL_ShadowSurface ) {
   999 		/* Blit the shadow surface using saved mapping */
  1000 		SDL_Palette *pal = screen->format->palette;
  1001 		SDL_Color *saved_colors = NULL;
  1002 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1003 			/* simulated 8bpp, use correct physical palette */
  1004 			saved_colors = pal->colors;
  1005 			if ( video->gammacols ) {
  1006 				/* gamma-corrected palette */
  1007 				pal->colors = video->gammacols;
  1008 			} else if ( video->physpal ) {
  1009 				/* physical palette different from logical */
  1010 				pal->colors = video->physpal->colors;
  1011 			}
  1012 		}
  1013 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1014 			SDL_LockCursor();
  1015 			SDL_DrawCursor(SDL_ShadowSurface);
  1016 			for ( i=0; i<numrects; ++i ) {
  1017 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1018 						SDL_VideoSurface, &rects[i]);
  1019 			}
  1020 			SDL_EraseCursor(SDL_ShadowSurface);
  1021 			SDL_UnlockCursor();
  1022 		} else {
  1023 			for ( i=0; i<numrects; ++i ) {
  1024 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1025 						SDL_VideoSurface, &rects[i]);
  1026 			}
  1027 		}
  1028 		if ( saved_colors ) {
  1029 			pal->colors = saved_colors;
  1030 		}
  1031 
  1032 		/* Fall through to video surface update */
  1033 		screen = SDL_VideoSurface;
  1034 	}
  1035 	if ( screen == SDL_VideoSurface ) {
  1036 		/* Update the video surface */
  1037 		if ( screen->offset ) {
  1038 			for ( i=0; i<numrects; ++i ) {
  1039 				rects[i].x += video->offset_x;
  1040 				rects[i].y += video->offset_y;
  1041 			}
  1042 			video->UpdateRects(this, numrects, rects);
  1043 			for ( i=0; i<numrects; ++i ) {
  1044 				rects[i].x -= video->offset_x;
  1045 				rects[i].y -= video->offset_y;
  1046 			}
  1047 		} else {
  1048 			video->UpdateRects(this, numrects, rects);
  1049 		}
  1050 	}
  1051 }
  1052 
  1053 /*
  1054  * Performs hardware double buffering, if possible, or a full update if not.
  1055  */
  1056 int SDL_Flip(SDL_Surface *screen)
  1057 {
  1058 	SDL_VideoDevice *video = current_video;
  1059 	/* Copy the shadow surface to the video surface */
  1060 	if ( screen == SDL_ShadowSurface ) {
  1061 		SDL_Rect rect;
  1062 		SDL_Palette *pal = screen->format->palette;
  1063 		SDL_Color *saved_colors = NULL;
  1064 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1065 			/* simulated 8bpp, use correct physical palette */
  1066 			saved_colors = pal->colors;
  1067 			if ( video->gammacols ) {
  1068 				/* gamma-corrected palette */
  1069 				pal->colors = video->gammacols;
  1070 			} else if ( video->physpal ) {
  1071 				/* physical palette different from logical */
  1072 				pal->colors = video->physpal->colors;
  1073 			}
  1074 		}
  1075 
  1076 		rect.x = 0;
  1077 		rect.y = 0;
  1078 		rect.w = screen->w;
  1079 		rect.h = screen->h;
  1080 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1081 			SDL_LockCursor();
  1082 			SDL_DrawCursor(SDL_ShadowSurface);
  1083 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1084 					SDL_VideoSurface, &rect);
  1085 			SDL_EraseCursor(SDL_ShadowSurface);
  1086 			SDL_UnlockCursor();
  1087 		} else {
  1088 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1089 					SDL_VideoSurface, &rect);
  1090 		}
  1091 		if ( saved_colors ) {
  1092 			pal->colors = saved_colors;
  1093 		}
  1094 
  1095 		/* Fall through to video surface update */
  1096 		screen = SDL_VideoSurface;
  1097 	}
  1098 	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
  1099 		SDL_VideoDevice *this  = current_video;
  1100 		return(video->FlipHWSurface(this, SDL_VideoSurface));
  1101 	} else {
  1102 		SDL_UpdateRect(screen, 0, 0, 0, 0);
  1103 	}
  1104 	return(0);
  1105 }
  1106 
  1107 static void SetPalette_logical(SDL_Surface *screen, SDL_Color *colors,
  1108 			       int firstcolor, int ncolors)
  1109 {
  1110 	SDL_Palette *pal = screen->format->palette;
  1111 	SDL_Palette *vidpal;
  1112 
  1113 	if ( colors != (pal->colors + firstcolor) ) {
  1114 		memcpy(pal->colors + firstcolor, colors,
  1115 		       ncolors * sizeof(*colors));
  1116 	}
  1117 
  1118 	vidpal = SDL_VideoSurface->format->palette;
  1119 	if ( (screen == SDL_ShadowSurface) && vidpal ) {
  1120 		/*
  1121 		 * This is a shadow surface, and the physical
  1122 		 * framebuffer is also indexed. Propagate the
  1123 		 * changes to its logical palette so that
  1124 		 * updates are always identity blits
  1125 		 */
  1126 		memcpy(vidpal->colors + firstcolor, colors,
  1127 		       ncolors * sizeof(*colors));
  1128 	}
  1129 	SDL_FormatChanged(screen);
  1130 }
  1131 
  1132 static int SetPalette_physical(SDL_Surface *screen,
  1133                                SDL_Color *colors, int firstcolor, int ncolors)
  1134 {
  1135 	SDL_VideoDevice *video = current_video;
  1136 	int gotall = 1;
  1137 
  1138 	if ( video->physpal ) {
  1139 		/* We need to copy the new colors, since we haven't
  1140 		 * already done the copy in the logical set above.
  1141 		 */
  1142 		memcpy(video->physpal->colors + firstcolor,
  1143 		       colors, ncolors * sizeof(*colors));
  1144 	}
  1145 	if ( screen == SDL_ShadowSurface ) {
  1146 		if ( SDL_VideoSurface->flags & SDL_HWPALETTE ) {
  1147 			/*
  1148 			 * The real screen is also indexed - set its physical
  1149 			 * palette. The physical palette does not include the
  1150 			 * gamma modification, we apply it directly instead,
  1151 			 * but this only happens if we have hardware palette.
  1152 			 */
  1153 			screen = SDL_VideoSurface;
  1154 		} else {
  1155 			/*
  1156 			 * The video surface is not indexed - invalidate any
  1157 			 * active shadow-to-video blit mappings.
  1158 			 */
  1159 			if ( screen->map->dst == SDL_VideoSurface ) {
  1160 				SDL_InvalidateMap(screen->map);
  1161 			}
  1162 			if ( video->gamma ) {
  1163 				if( ! video->gammacols ) {
  1164 					SDL_Palette *pp = video->physpal;
  1165 					if(!pp)
  1166 						pp = screen->format->palette;
  1167 					video->gammacols = malloc(pp->ncolors
  1168 							  * sizeof(SDL_Color));
  1169 					SDL_ApplyGamma(video->gamma,
  1170 						       pp->colors,
  1171 						       video->gammacols,
  1172 						       pp->ncolors);
  1173 				} else {
  1174 					SDL_ApplyGamma(video->gamma, colors,
  1175 						       video->gammacols
  1176 						       + firstcolor,
  1177 						       ncolors);
  1178 				}
  1179 			}
  1180 			SDL_UpdateRect(screen, 0, 0, 0, 0);
  1181 		}
  1182 	}
  1183 
  1184 	if ( screen == SDL_VideoSurface ) {
  1185 		SDL_Color gcolors[256];
  1186 
  1187 		if ( video->gamma ) {
  1188 			SDL_ApplyGamma(video->gamma, colors, gcolors, ncolors);
  1189 			colors = gcolors;
  1190 		}
  1191 		gotall = video->SetColors(video, firstcolor, ncolors, colors);
  1192 		if ( ! gotall ) {
  1193 			/* The video flags shouldn't have SDL_HWPALETTE, and
  1194 			   the video driver is responsible for copying back the
  1195 			   correct colors into the video surface palette.
  1196 			*/
  1197 			;
  1198 		}
  1199 		SDL_CursorPaletteChanged();
  1200 	}
  1201 	return gotall;
  1202 }
  1203 
  1204 /*
  1205  * Set the physical and/or logical colormap of a surface:
  1206  * Only the screen has a physical colormap. It determines what is actually
  1207  * sent to the display.
  1208  * The logical colormap is used to map blits to/from the surface.
  1209  * 'which' is one or both of SDL_LOGPAL, SDL_PHYSPAL
  1210  *
  1211  * Return nonzero if all colours were set as requested, or 0 otherwise.
  1212  */
  1213 int SDL_SetPalette(SDL_Surface *screen, int which,
  1214 		   SDL_Color *colors, int firstcolor, int ncolors)
  1215 {
  1216 	SDL_Palette *pal;
  1217 	int gotall;
  1218 	int palsize;
  1219 
  1220 	if ( ! current_video ) {
  1221 		return 0;
  1222 	}
  1223 	if ( screen != SDL_PublicSurface ) {
  1224 		/* only screens have physical palettes */
  1225 		which &= ~SDL_PHYSPAL;
  1226 	} else if( (screen->flags & SDL_HWPALETTE) != SDL_HWPALETTE ) {
  1227 		/* hardware palettes required for split colormaps */
  1228 		which |= SDL_PHYSPAL | SDL_LOGPAL;
  1229 	}
  1230 
  1231 	/* Verify the parameters */
  1232 	pal = screen->format->palette;
  1233 	if( !pal ) {
  1234 		return 0;	/* not a palettized surface */
  1235 	}
  1236 	gotall = 1;
  1237 	palsize = 1 << screen->format->BitsPerPixel;
  1238 	if ( ncolors > (palsize - firstcolor) ) {
  1239 		ncolors = (palsize - firstcolor);
  1240 		gotall = 0;
  1241 	}
  1242 
  1243 	if ( which & SDL_LOGPAL ) {
  1244 		/*
  1245 		 * Logical palette change: The actual screen isn't affected,
  1246 		 * but the internal colormap is altered so that the
  1247 		 * interpretation of the pixel values (for blits etc) is
  1248 		 * changed.
  1249 		 */
  1250 		SetPalette_logical(screen, colors, firstcolor, ncolors);
  1251 	}
  1252 	if ( which & SDL_PHYSPAL ) {
  1253 		SDL_VideoDevice *video = current_video;
  1254 		/*
  1255 		 * Physical palette change: This doesn't affect the
  1256 		 * program's idea of what the screen looks like, but changes
  1257 		 * its actual appearance.
  1258 		 */
  1259 		if(!video)
  1260 			return gotall;	/* video not yet initialized */
  1261 		if(!video->physpal && !(which & SDL_LOGPAL) ) {
  1262 			/* Lazy physical palette allocation */
  1263 			int size;
  1264 			SDL_Palette *pp = malloc(sizeof(*pp));
  1265 			current_video->physpal = pp;
  1266 			pp->ncolors = pal->ncolors;
  1267 			size = pp->ncolors * sizeof(SDL_Color);
  1268 			pp->colors = malloc(size);
  1269 			memcpy(pp->colors, pal->colors, size);
  1270 		}
  1271 		if ( ! SetPalette_physical(screen,
  1272 		                           colors, firstcolor, ncolors) ) {
  1273 			gotall = 0;
  1274 		}
  1275 	}
  1276 	return gotall;
  1277 }
  1278 
  1279 int SDL_SetColors(SDL_Surface *screen, SDL_Color *colors, int firstcolor,
  1280 		  int ncolors)
  1281 {
  1282 	return SDL_SetPalette(screen, SDL_LOGPAL | SDL_PHYSPAL,
  1283 			      colors, firstcolor, ncolors);
  1284 }
  1285 
  1286 /*
  1287  * Clean up the video subsystem
  1288  */
  1289 void SDL_VideoQuit (void)
  1290 {
  1291 	SDL_Surface *ready_to_go;
  1292 
  1293 	if ( current_video ) {
  1294 		SDL_VideoDevice *video = current_video;
  1295 		SDL_VideoDevice *this  = current_video;
  1296 
  1297 		/* Halt event processing before doing anything else */
  1298 		SDL_StopEventLoop();
  1299 
  1300 		/* Clean up allocated window manager items */
  1301 		if ( SDL_PublicSurface ) {
  1302 			SDL_PublicSurface = NULL;
  1303 		}
  1304 		SDL_CursorQuit();
  1305 
  1306 		/* Just in case... */
  1307 		SDL_WM_GrabInputOff();
  1308 
  1309 		/* Clean up the system video */
  1310 		video->VideoQuit(this);
  1311 
  1312 		/* Free any lingering surfaces */
  1313 		ready_to_go = SDL_ShadowSurface;
  1314 		SDL_ShadowSurface = NULL;
  1315 		SDL_FreeSurface(ready_to_go);
  1316 		if ( SDL_VideoSurface != NULL ) {
  1317 			ready_to_go = SDL_VideoSurface;
  1318 			SDL_VideoSurface = NULL;
  1319 			SDL_FreeSurface(ready_to_go);
  1320 		}
  1321 		SDL_PublicSurface = NULL;
  1322 
  1323 		/* Clean up miscellaneous memory */
  1324 		if ( video->physpal ) {
  1325 			free(video->physpal->colors);
  1326 			free(video->physpal);
  1327 			video->physpal = NULL;
  1328 		}
  1329 		if ( video->gammacols ) {
  1330 			free(video->gammacols);
  1331 			video->gammacols = NULL;
  1332 		}
  1333 		if ( video->gamma ) {
  1334 			free(video->gamma);
  1335 			video->gamma = NULL;
  1336 		}
  1337 		if ( video->wm_title != NULL ) {
  1338 			free(video->wm_title);
  1339 			video->wm_title = NULL;
  1340 		}
  1341 		if ( video->wm_icon != NULL ) {
  1342 			free(video->wm_icon);
  1343 			video->wm_icon = NULL;
  1344 		}
  1345 
  1346 		/* Finish cleaning up video subsystem */
  1347 		video->free(this);
  1348 		current_video = NULL;
  1349 	}
  1350 	return;
  1351 }
  1352 
  1353 /* Load the GL driver library */
  1354 int SDL_GL_LoadLibrary(const char *path)
  1355 {
  1356 	SDL_VideoDevice *video = current_video;
  1357 	SDL_VideoDevice *this = current_video;
  1358 	int retval;
  1359 
  1360 	retval = -1;
  1361 	if ( video == NULL ) {
  1362 		SDL_SetError("Video subsystem has not been initialized");
  1363 	} else {
  1364 		if ( video->GL_LoadLibrary ) {
  1365 			retval = video->GL_LoadLibrary(this, path);
  1366 		} else {
  1367 			SDL_SetError("No dynamic GL support in video driver");
  1368 		}
  1369 	}
  1370 	return(retval);
  1371 }
  1372 
  1373 void *SDL_GL_GetProcAddress(const char* proc)
  1374 {
  1375 	SDL_VideoDevice *video = current_video;
  1376 	SDL_VideoDevice *this = current_video;
  1377 	void *func;
  1378 
  1379 	func = NULL;
  1380 	if ( video->GL_GetProcAddress ) {
  1381 		if ( video->gl_config.driver_loaded ) {
  1382 			func = video->GL_GetProcAddress(this, proc);
  1383 		} else {
  1384 			SDL_SetError("No GL driver has been loaded");
  1385 		}
  1386 	} else {
  1387 		SDL_SetError("No dynamic GL support in video driver");
  1388 	}
  1389 	return func;
  1390 }
  1391 
  1392 /* Set the specified GL attribute for setting up a GL video mode */
  1393 int SDL_GL_SetAttribute( SDL_GLattr attr, int value )
  1394 {
  1395 	int retval;
  1396 	SDL_VideoDevice *video = current_video;
  1397 
  1398 	retval = 0;
  1399 	switch (attr) {
  1400 		case SDL_GL_RED_SIZE:
  1401 			video->gl_config.red_size = value;
  1402 			break;
  1403 		case SDL_GL_GREEN_SIZE:
  1404 			video->gl_config.green_size = value;
  1405 			break;
  1406 		case SDL_GL_BLUE_SIZE:
  1407 			video->gl_config.blue_size = value;
  1408 			break;
  1409 		case SDL_GL_ALPHA_SIZE:
  1410 			video->gl_config.alpha_size = value;
  1411 			break;
  1412 		case SDL_GL_DOUBLEBUFFER:
  1413 			video->gl_config.double_buffer = value;
  1414 			break;
  1415 		case SDL_GL_BUFFER_SIZE:
  1416 			video->gl_config.buffer_size = value;
  1417 			break;
  1418 		case SDL_GL_DEPTH_SIZE:
  1419 			video->gl_config.depth_size = value;
  1420 			break;
  1421 		case SDL_GL_STENCIL_SIZE:
  1422 			video->gl_config.stencil_size = value;
  1423 			break;
  1424 		case SDL_GL_ACCUM_RED_SIZE:
  1425 			video->gl_config.accum_red_size = value;
  1426 			break;
  1427 		case SDL_GL_ACCUM_GREEN_SIZE:
  1428 			video->gl_config.accum_green_size = value;
  1429 			break;
  1430 		case SDL_GL_ACCUM_BLUE_SIZE:
  1431 			video->gl_config.accum_blue_size = value;
  1432 			break;
  1433 		case SDL_GL_ACCUM_ALPHA_SIZE:
  1434 			video->gl_config.accum_alpha_size = value;
  1435 			break;
  1436 		case SDL_GL_STEREO:
  1437 			video->gl_config.stereo = value;
  1438 			break;
  1439 		case SDL_GL_MULTISAMPLEBUFFERS:
  1440 			video->gl_config.multisamplebuffers = value;
  1441 			break;
  1442 		case SDL_GL_MULTISAMPLESAMPLES:
  1443 			video->gl_config.multisamplesamples = value;
  1444 			break;
  1445 		default:
  1446 			SDL_SetError("Unknown OpenGL attribute");
  1447 			retval = -1;
  1448 			break;
  1449 	}
  1450 	return(retval);
  1451 }
  1452 
  1453 /* Retrieve an attribute value from the windowing system. */
  1454 int SDL_GL_GetAttribute(SDL_GLattr attr, int* value)
  1455 {
  1456 	int retval = -1;
  1457 	SDL_VideoDevice* video = current_video;
  1458 	SDL_VideoDevice* this = current_video;
  1459 
  1460 	if ( video->GL_GetAttribute ) {
  1461 		retval = this->GL_GetAttribute(this, attr, value);
  1462 	} else {
  1463 		*value = 0;
  1464 		SDL_SetError("GL_GetAttribute not supported");
  1465 	}
  1466 	return retval;
  1467 }
  1468 
  1469 /* Perform a GL buffer swap on the current GL context */
  1470 void SDL_GL_SwapBuffers(void)
  1471 {
  1472 	SDL_VideoDevice *video = current_video;
  1473 	SDL_VideoDevice *this = current_video;
  1474 
  1475 	if ( video->screen->flags & SDL_OPENGL ) {
  1476 		video->GL_SwapBuffers(this);
  1477 	} else {
  1478 		SDL_SetError("OpenGL video mode has not been set");
  1479 	}
  1480 }
  1481 
  1482 /* Update rects with locking */
  1483 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect *rects)
  1484 {
  1485 	SDL_GL_Lock();
  1486  	SDL_GL_UpdateRects(numrects, rects);
  1487 	SDL_GL_Unlock();
  1488 }
  1489 
  1490 /* Update rects without state setting and changing (the caller is responsible for it) */
  1491 void SDL_GL_UpdateRects(int numrects, SDL_Rect *rects)
  1492 {
  1493 #ifdef HAVE_OPENGL
  1494 	SDL_VideoDevice *this = current_video;
  1495 	SDL_Rect update, tmp;
  1496 	int x, y, i;
  1497 
  1498 	for ( i = 0; i < numrects; i++ )
  1499 	{
  1500 		tmp.y = rects[i].y;
  1501 		tmp.h = rects[i].h;
  1502 		for ( y = 0; y <= rects[i].h / 256; y++ )
  1503 		{
  1504 			tmp.x = rects[i].x;
  1505 			tmp.w = rects[i].w;
  1506 			for ( x = 0; x <= rects[i].w / 256; x++ )
  1507 			{
  1508 				update.x = tmp.x;
  1509 				update.y = tmp.y;
  1510 				update.w = tmp.w;
  1511 				update.h = tmp.h;
  1512 
  1513 				if ( update.w > 256 )
  1514 					update.w = 256;
  1515 
  1516 				if ( update.h > 256 )
  1517 					update.h = 256;
  1518 			
  1519 				this->glFlush();
  1520 				this->glTexSubImage2D( 
  1521 					GL_TEXTURE_2D, 
  1522 					0, 
  1523 					0, 
  1524 					0, 
  1525 					update.w, 
  1526 					update.h, 
  1527 					this->is_32bit? GL_RGBA : GL_RGB,
  1528 #ifdef GL_VERSION_1_2
  1529 					this->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
  1530 #else
  1531 					GL_UNSIGNED_BYTE,
  1532 #endif
  1533 					(Uint8 *)this->screen->pixels + 
  1534 						this->screen->format->BytesPerPixel * update.x + 
  1535 						update.y * this->screen->pitch );
  1536 	
  1537 				this->glFlush();
  1538 				/*
  1539 				* Note the parens around the function name:
  1540 				* This is because some OpenGL implementations define glTexCoord etc 
  1541 				* as macros, and we don't want them expanded here.
  1542 				*/
  1543 				this->glBegin(GL_TRIANGLE_STRIP);
  1544 					(this->glTexCoord2f)( 0.0, 0.0 );	
  1545 					(this->glVertex2i)( update.x, update.y );
  1546 					(this->glTexCoord2f)( (float)(update.w / 256.0), 0.0 );	
  1547 					(this->glVertex2i)( update.x + update.w, update.y );
  1548 					(this->glTexCoord2f)( 0.0, (float)(update.h / 256.0) );
  1549 					(this->glVertex2i)( update.x, update.y + update.h );
  1550 					(this->glTexCoord2f)( (float)(update.w / 256.0), (float)(update.h / 256.0) );	
  1551 					(this->glVertex2i)( update.x + update.w	, update.y + update.h );
  1552 				this->glEnd();	
  1553 			
  1554 				tmp.x += 256;
  1555 				tmp.w -= 256;
  1556 			}
  1557 			tmp.y += 256;
  1558 			tmp.h -= 256;
  1559 		}
  1560 	}
  1561 #endif
  1562 }
  1563 
  1564 /* Lock == save current state */
  1565 void SDL_GL_Lock()
  1566 {
  1567 #ifdef HAVE_OPENGL
  1568 	lock_count--;
  1569 	if (lock_count==-1)
  1570 	{
  1571 		SDL_VideoDevice *this = current_video;
  1572 
  1573 		this->glPushAttrib( GL_ALL_ATTRIB_BITS );	/* TODO: narrow range of what is saved */
  1574 #ifdef GL_CLIENT_PIXEL_STORE_BIT
  1575 		this->glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
  1576 #endif
  1577 
  1578 		this->glEnable(GL_TEXTURE_2D);
  1579 		this->glEnable(GL_BLEND);
  1580 		this->glDisable(GL_FOG);
  1581 		this->glDisable(GL_ALPHA_TEST);
  1582 		this->glDisable(GL_DEPTH_TEST);
  1583 		this->glDisable(GL_SCISSOR_TEST);	
  1584 		this->glDisable(GL_STENCIL_TEST);
  1585 		this->glDisable(GL_CULL_FACE);
  1586 
  1587 		this->glBindTexture( GL_TEXTURE_2D, this->texture );
  1588 		this->glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
  1589 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
  1590 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
  1591 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
  1592 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
  1593 
  1594 		this->glPixelStorei( GL_UNPACK_ROW_LENGTH, this->screen->pitch / this->screen->format->BytesPerPixel );
  1595 		this->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  1596 		(this->glColor4f)(1.0, 1.0, 1.0, 1.0);		/* Solaris workaround */
  1597 
  1598 		this->glViewport(0, 0, this->screen->w, this->screen->h);
  1599 		this->glMatrixMode(GL_PROJECTION);
  1600 		this->glPushMatrix();
  1601 		this->glLoadIdentity();
  1602 
  1603 		this->glOrtho(0.0, (GLdouble) this->screen->w, (GLdouble) this->screen->h, 0.0, 0.0, 1.0);
  1604 
  1605 		this->glMatrixMode(GL_MODELVIEW);
  1606 		this->glPushMatrix();
  1607 		this->glLoadIdentity();
  1608 	}
  1609 #endif
  1610 }
  1611 
  1612 /* Unlock == restore saved state */
  1613 void SDL_GL_Unlock()
  1614 {
  1615 #ifdef HAVE_OPENGL
  1616 	lock_count++;
  1617 	if (lock_count==0)
  1618 	{
  1619 		SDL_VideoDevice *this = current_video;
  1620 
  1621 		this->glPopMatrix();
  1622 		this->glMatrixMode(GL_PROJECTION);
  1623 		this->glPopMatrix();
  1624 
  1625 		this->glPopClientAttrib();
  1626 		this->glPopAttrib();
  1627 	}
  1628 #endif
  1629 }
  1630 
  1631 /*
  1632  * Sets/Gets the title and icon text of the display window, if any.
  1633  */
  1634 void SDL_WM_SetCaption (const char *title, const char *icon)
  1635 {
  1636 	SDL_VideoDevice *video = current_video;
  1637 	SDL_VideoDevice *this  = current_video;
  1638 
  1639 	if ( video ) {
  1640 		if ( title ) {
  1641 			if ( video->wm_title ) {
  1642 				free(video->wm_title);
  1643 			}
  1644 			video->wm_title = (char *)malloc(strlen(title)+1);
  1645 			if ( video->wm_title != NULL ) {
  1646 				strcpy(video->wm_title, title);
  1647 			}
  1648 		}
  1649 		if ( icon ) {
  1650 			if ( video->wm_icon ) {
  1651 				free(video->wm_icon);
  1652 			}
  1653 			video->wm_icon = (char *)malloc(strlen(icon)+1);
  1654 			if ( video->wm_icon != NULL ) {
  1655 				strcpy(video->wm_icon, icon);
  1656 			}
  1657 		}
  1658 		if ( (title || icon) && (video->SetCaption != NULL) ) {
  1659 			video->SetCaption(this, video->wm_title,video->wm_icon);
  1660 		}
  1661 	}
  1662 }
  1663 void SDL_WM_GetCaption (char **title, char **icon)
  1664 {
  1665 	SDL_VideoDevice *video = current_video;
  1666 
  1667 	if ( video ) {
  1668 		if ( title ) {
  1669 			*title = video->wm_title;
  1670 		}
  1671 		if ( icon ) {
  1672 			*icon = video->wm_icon;
  1673 		}
  1674 	}
  1675 }
  1676 
  1677 /* Utility function used by SDL_WM_SetIcon();
  1678  * flags & 1 for color key, flags & 2 for alpha channel. */
  1679 static void CreateMaskFromColorKeyOrAlpha(SDL_Surface *icon, Uint8 *mask, int flags)
  1680 {
  1681 	int x, y;
  1682 	Uint32 colorkey;
  1683 #define SET_MASKBIT(icon, x, y, mask) \
  1684 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  1685 
  1686 	colorkey = icon->format->colorkey;
  1687 	switch (icon->format->BytesPerPixel) {
  1688 		case 1: { Uint8 *pixels;
  1689 			for ( y=0; y<icon->h; ++y ) {
  1690 				pixels = (Uint8 *)icon->pixels + y*icon->pitch;
  1691 				for ( x=0; x<icon->w; ++x ) {
  1692 					if ( *pixels++ == colorkey ) {
  1693 						SET_MASKBIT(icon, x, y, mask);
  1694 					}
  1695 				}
  1696 			}
  1697 		}
  1698 		break;
  1699 
  1700 		case 2: { Uint16 *pixels;
  1701 			for ( y=0; y<icon->h; ++y ) {
  1702 				pixels = (Uint16 *)icon->pixels +
  1703 				                   y*icon->pitch/2;
  1704 				for ( x=0; x<icon->w; ++x ) {
  1705 					if ( (flags & 1) && *pixels == colorkey ) {
  1706 						SET_MASKBIT(icon, x, y, mask);
  1707 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1708 						SET_MASKBIT(icon, x, y, mask);
  1709 					}
  1710 					pixels++;
  1711 				}
  1712 			}
  1713 		}
  1714 		break;
  1715 
  1716 		case 4: { Uint32 *pixels;
  1717 			for ( y=0; y<icon->h; ++y ) {
  1718 				pixels = (Uint32 *)icon->pixels +
  1719 				                   y*icon->pitch/4;
  1720 				for ( x=0; x<icon->w; ++x ) {
  1721 					if ( (flags & 1) && *pixels == colorkey ) {
  1722 						SET_MASKBIT(icon, x, y, mask);
  1723 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1724 						SET_MASKBIT(icon, x, y, mask);
  1725 					}
  1726 					pixels++;
  1727 				}
  1728 			}
  1729 		}
  1730 		break;
  1731 	}
  1732 }
  1733 
  1734 /*
  1735  * Sets the window manager icon for the display window.
  1736  */
  1737 void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
  1738 {
  1739 	SDL_VideoDevice *video = current_video;
  1740 	SDL_VideoDevice *this  = current_video;
  1741 
  1742 	if ( icon && video->SetIcon ) {
  1743 		/* Generate a mask if necessary, and create the icon! */
  1744 		if ( mask == NULL ) {
  1745 			int mask_len = icon->h*(icon->w+7)/8;
  1746 			int flags = 0;
  1747 			mask = (Uint8 *)malloc(mask_len);
  1748 			if ( mask == NULL ) {
  1749 				return;
  1750 			}
  1751 			memset(mask, ~0, mask_len);
  1752 			if ( icon->flags & SDL_SRCCOLORKEY ) flags |= 1;
  1753 			if ( icon->flags & SDL_SRCALPHA ) flags |= 2;
  1754 			if( flags ) {
  1755 				CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  1756 			}
  1757 			video->SetIcon(video, icon, mask);
  1758 			free(mask);
  1759 		} else {
  1760 			video->SetIcon(this, icon, mask);
  1761 		}
  1762 	}
  1763 }
  1764 
  1765 /*
  1766  * Grab or ungrab the keyboard and mouse input.
  1767  * This function returns the final grab mode after calling the
  1768  * driver dependent function.
  1769  */
  1770 static SDL_GrabMode SDL_WM_GrabInputRaw(SDL_GrabMode mode)
  1771 {
  1772 	SDL_VideoDevice *video = current_video;
  1773 	SDL_VideoDevice *this  = current_video;
  1774 
  1775 	/* Only do something if we have support for grabs */
  1776 	if ( video->GrabInput == NULL ) {
  1777 		return(video->input_grab);
  1778 	}
  1779 
  1780 	/* If the final grab mode if off, only then do we actually grab */
  1781 #ifdef DEBUG_GRAB
  1782   printf("SDL_WM_GrabInputRaw(%d) ... ", mode);
  1783 #endif
  1784 	if ( mode == SDL_GRAB_OFF ) {
  1785 		if ( video->input_grab != SDL_GRAB_OFF ) {
  1786 			mode = video->GrabInput(this, mode);
  1787 		}
  1788 	} else {
  1789 		if ( video->input_grab == SDL_GRAB_OFF ) {
  1790 			mode = video->GrabInput(this, mode);
  1791 		}
  1792 	}
  1793 	if ( mode != video->input_grab ) {
  1794 		video->input_grab = mode;
  1795 		if ( video->CheckMouseMode ) {
  1796 			video->CheckMouseMode(this);
  1797 		}
  1798 	}
  1799 #ifdef DEBUG_GRAB
  1800   printf("Final mode %d\n", video->input_grab);
  1801 #endif
  1802 
  1803 	/* Return the final grab state */
  1804 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1805 		mode -= SDL_GRAB_FULLSCREEN;
  1806 	}
  1807 	return(mode);
  1808 }
  1809 SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode)
  1810 {
  1811 	SDL_VideoDevice *video = current_video;
  1812 
  1813 	/* If the video isn't initialized yet, we can't do anything */
  1814 	if ( ! video ) {
  1815 		return SDL_GRAB_OFF;
  1816 	}
  1817 
  1818 	/* Return the current mode on query */
  1819 	if ( mode == SDL_GRAB_QUERY ) {
  1820 		mode = video->input_grab;
  1821 		if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1822 			mode -= SDL_GRAB_FULLSCREEN;
  1823 		}
  1824 		return(mode);
  1825 	}
  1826 
  1827 #ifdef DEBUG_GRAB
  1828   printf("SDL_WM_GrabInput(%d) ... ", mode);
  1829 #endif
  1830 	/* If the video surface is fullscreen, we always grab */
  1831 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1832 		mode -= SDL_GRAB_FULLSCREEN;
  1833 	}
  1834 	if ( SDL_VideoSurface && (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
  1835 		mode += SDL_GRAB_FULLSCREEN;
  1836 	}
  1837 	return(SDL_WM_GrabInputRaw(mode));
  1838 }
  1839 static SDL_GrabMode SDL_WM_GrabInputOff(void)
  1840 {
  1841 	SDL_GrabMode mode;
  1842 
  1843 	/* First query the current grab state */
  1844 	mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
  1845 
  1846 	/* Now explicitly turn off input grab */
  1847 	SDL_WM_GrabInputRaw(SDL_GRAB_OFF);
  1848 
  1849 	/* Return the old state */
  1850 	return(mode);
  1851 }
  1852 
  1853 /*
  1854  * Iconify the window in window managed environments.
  1855  * A successful iconification will result in an SDL_APPACTIVE loss event.
  1856  */
  1857 int SDL_WM_IconifyWindow(void)
  1858 {
  1859 	SDL_VideoDevice *video = current_video;
  1860 	SDL_VideoDevice *this  = current_video;
  1861 	int retval;
  1862 
  1863 	retval = 0;
  1864 	if ( video->IconifyWindow ) {
  1865 		retval = video->IconifyWindow(this);
  1866 	}
  1867 	return(retval);
  1868 }
  1869 
  1870 /*
  1871  * Toggle fullscreen mode
  1872  */
  1873 int SDL_WM_ToggleFullScreen(SDL_Surface *surface)
  1874 {
  1875 	SDL_VideoDevice *video = current_video;
  1876 	SDL_VideoDevice *this  = current_video;
  1877 	int toggled;
  1878 
  1879 	toggled = 0;
  1880 	if ( SDL_PublicSurface && (surface == SDL_PublicSurface) &&
  1881 	     video->ToggleFullScreen ) {
  1882 		if ( surface->flags & SDL_FULLSCREEN ) {
  1883 			toggled = video->ToggleFullScreen(this, 0);
  1884 			if ( toggled ) {
  1885 				SDL_VideoSurface->flags &= ~SDL_FULLSCREEN;
  1886 				SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
  1887 			}
  1888 		} else {
  1889 			toggled = video->ToggleFullScreen(this, 1);
  1890 			if ( toggled ) {
  1891 				SDL_VideoSurface->flags |= SDL_FULLSCREEN;
  1892 				SDL_PublicSurface->flags |= SDL_FULLSCREEN;
  1893 			}
  1894 		}
  1895 		/* Double-check the grab state inside SDL_WM_GrabInput() */
  1896 		if ( toggled ) {
  1897 			SDL_WM_GrabInput(video->input_grab);
  1898 		}
  1899 	}
  1900 	return(toggled);
  1901 }
  1902 
  1903 /*
  1904  * Get some platform dependent window manager information
  1905  */
  1906 int SDL_GetWMInfo (SDL_SysWMinfo *info)
  1907 {
  1908 	SDL_VideoDevice *video = current_video;
  1909 	SDL_VideoDevice *this  = current_video;
  1910 
  1911 	if ( video && video->GetWMInfo ) {
  1912 		return(video->GetWMInfo(this, info));
  1913 	} else {
  1914 		return(0);
  1915 	}
  1916 }