src/video/SDL_video.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 19 Jan 2006 08:43:00 +0000
changeset 1251 86d0d01290ea
parent 1210 8609567ea02f
child 1254 c2ee0f7fa711
permissions -rw-r--r--
Updated Windows CE/PocketPC support...adds GAPI driver, landscape mode,
updated project files, VS2005 support, VGA mode, more device support, etc,
etc, etc.

Fixes Bugzilla #47 and #28.

--ryan.
     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_QUARTZ
    49 	&QZ_bootstrap,
    50 #endif
    51 #ifdef ENABLE_X11
    52 	&X11_bootstrap,
    53 #endif
    54 #ifdef ENABLE_DGA
    55 	&DGA_bootstrap,
    56 #endif
    57 #ifdef ENABLE_NANOX
    58 	&NX_bootstrap,
    59 #endif
    60 #ifdef ENABLE_IPOD
    61 	&iPod_bootstrap,
    62 #endif
    63 #ifdef ENABLE_QTOPIA
    64 	&Qtopia_bootstrap,
    65 #endif
    66 #ifdef ENABLE_WSCONS
    67 	&WSCONS_bootstrap,
    68 #endif
    69 #ifdef ENABLE_FBCON
    70 	&FBCON_bootstrap,
    71 #endif
    72 #ifdef ENABLE_DIRECTFB
    73 	&DirectFB_bootstrap,
    74 #endif
    75 #ifdef ENABLE_PS2GS
    76 	&PS2GS_bootstrap,
    77 #endif
    78 #ifdef ENABLE_GGI
    79 	&GGI_bootstrap,
    80 #endif
    81 #ifdef ENABLE_VGL
    82 	&VGL_bootstrap,
    83 #endif
    84 #ifdef ENABLE_SVGALIB
    85 	&SVGALIB_bootstrap,
    86 #endif
    87 #ifdef ENABLE_AALIB
    88 	&AALIB_bootstrap,
    89 #endif
    90 #ifdef ENABLE_GAPI
    91 	&GAPI_bootstrap,
    92 #endif
    93 #ifdef ENABLE_WINDIB
    94 	&WINDIB_bootstrap,
    95 #endif
    96 #ifdef ENABLE_DIRECTX
    97 	&DIRECTX_bootstrap,
    98 #endif
    99 #ifdef ENABLE_BWINDOW
   100 	&BWINDOW_bootstrap,
   101 #endif
   102 #ifdef ENABLE_TOOLBOX
   103 	&TOOLBOX_bootstrap,
   104 #endif
   105 #ifdef ENABLE_DRAWSPROCKET
   106 	&DSp_bootstrap,
   107 #endif
   108 #ifdef ENABLE_CYBERGRAPHICS
   109 	&CGX_bootstrap,
   110 #endif
   111 #ifdef ENABLE_PHOTON
   112 	&ph_bootstrap,
   113 #endif
   114 #ifdef ENABLE_EPOC
   115 	&EPOC_bootstrap,
   116 #endif
   117 #ifdef ENABLE_XBIOS
   118 	&XBIOS_bootstrap,
   119 #endif
   120 #ifdef ENABLE_GEM
   121 	&GEM_bootstrap,
   122 #endif
   123 #ifdef ENABLE_PICOGUI
   124 	&PG_bootstrap,
   125 #endif
   126 #ifdef ENABLE_DC
   127 	&DC_bootstrap,
   128 #endif
   129 #ifdef ENABLE_RISCOS
   130     &RISCOS_bootstrap,
   131 #endif
   132 #ifdef __OS2__
   133 	&OS2FSLib_bootstrap,
   134 #endif
   135 #ifdef ENABLE_DUMMYVIDEO
   136 	&DUMMY_bootstrap,
   137 #endif
   138 	NULL
   139 };
   140 
   141 SDL_VideoDevice *current_video = NULL;
   142 
   143 /* Various local functions */
   144 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   145 void SDL_VideoQuit(void);
   146 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect* rects);
   147 
   148 static SDL_GrabMode SDL_WM_GrabInputOff(void);
   149 #ifdef HAVE_OPENGL
   150 static int lock_count = 0;
   151 #endif
   152 
   153 
   154 /*
   155  * Initialize the video and event subsystems -- determine native pixel format
   156  */
   157 int SDL_VideoInit (const char *driver_name, Uint32 flags)
   158 {
   159 	SDL_VideoDevice *video;
   160 	int index;
   161 	int i;
   162 	SDL_PixelFormat vformat;
   163 	Uint32 video_flags;
   164 
   165 	/* Toggle the event thread flags, based on OS requirements */
   166 #if defined(MUST_THREAD_EVENTS)
   167 	flags |= SDL_INIT_EVENTTHREAD;
   168 #elif defined(CANT_THREAD_EVENTS)
   169 	if ( (flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {
   170 		SDL_SetError("OS doesn't support threaded events");
   171 		return(-1);
   172 	}
   173 #endif
   174 
   175 	/* Check to make sure we don't overwrite 'current_video' */
   176 	if ( current_video != NULL ) {
   177 		SDL_VideoQuit();
   178 	}
   179 
   180 	/* Select the proper video driver */
   181 	index = 0;
   182 	video = NULL;
   183 	if ( driver_name != NULL ) {
   184 #if 0	/* This will be replaced with a better driver selection API */
   185 		if ( strrchr(driver_name, ':') != NULL ) {
   186 			index = atoi(strrchr(driver_name, ':')+1);
   187 		}
   188 #endif
   189 		for ( i=0; bootstrap[i]; ++i ) {
   190 			if ( strncmp(bootstrap[i]->name, driver_name,
   191 			             strlen(bootstrap[i]->name)) == 0 ) {
   192 				if ( bootstrap[i]->available() ) {
   193 					video = bootstrap[i]->create(index);
   194 					break;
   195 				}
   196 			}
   197 		}
   198 	} else {
   199 		for ( i=0; bootstrap[i]; ++i ) {
   200 			if ( bootstrap[i]->available() ) {
   201 				video = bootstrap[i]->create(index);
   202 				if ( video != NULL ) {
   203 					break;
   204 				}
   205 			}
   206 		}
   207 	}
   208 	if ( video == NULL ) {
   209 		SDL_SetError("No available video device");
   210 		return(-1);
   211 	}
   212 	current_video = video;
   213 	current_video->name = bootstrap[i]->name;
   214 
   215 	/* Do some basic variable initialization */
   216 	video->screen = NULL;
   217 	video->shadow = NULL;
   218 	video->visible = NULL;
   219 	video->physpal = NULL;
   220 	video->gammacols = NULL;
   221 	video->gamma = NULL;
   222 	video->wm_title = NULL;
   223 	video->wm_icon  = NULL;
   224 	video->offset_x = 0;
   225 	video->offset_y = 0;
   226 	memset(&video->info, 0, (sizeof video->info));
   227 	
   228 	video->displayformatalphapixel = NULL;
   229 
   230 	/* Set some very sane GL defaults */
   231 	video->gl_config.driver_loaded = 0;
   232 	video->gl_config.dll_handle = NULL;
   233 	video->gl_config.red_size = 5;
   234 #if 1 /* This seems to work on more video cards, as a default */
   235 	video->gl_config.green_size = 5;
   236 #else
   237 	video->gl_config.green_size = 6;
   238 #endif
   239 	video->gl_config.blue_size = 5;
   240 	video->gl_config.alpha_size = 0;
   241 	video->gl_config.buffer_size = 0;
   242 	video->gl_config.depth_size = 16;
   243 	video->gl_config.stencil_size = 0;
   244 	video->gl_config.double_buffer = 1;
   245 	video->gl_config.accum_red_size = 0;
   246 	video->gl_config.accum_green_size = 0;
   247 	video->gl_config.accum_blue_size = 0;
   248 	video->gl_config.accum_alpha_size = 0;
   249 	video->gl_config.stereo = 0;
   250 	video->gl_config.multisamplebuffers = 0;
   251 	video->gl_config.multisamplesamples = 0;
   252 	
   253 	/* Initialize the video subsystem */
   254 	memset(&vformat, 0, sizeof(vformat));
   255 	if ( video->VideoInit(video, &vformat) < 0 ) {
   256 		SDL_VideoQuit();
   257 		return(-1);
   258 	}
   259 
   260 	/* Create a zero sized video surface of the appropriate format */
   261 	video_flags = SDL_SWSURFACE;
   262 	SDL_VideoSurface = SDL_CreateRGBSurface(video_flags, 0, 0,
   263 				vformat.BitsPerPixel,
   264 				vformat.Rmask, vformat.Gmask, vformat.Bmask, 0);
   265 	if ( SDL_VideoSurface == NULL ) {
   266 		SDL_VideoQuit();
   267 		return(-1);
   268 	}
   269 	SDL_PublicSurface = NULL;	/* Until SDL_SetVideoMode() */
   270 
   271 #if 0 /* Don't change the current palette - may be used by other programs.
   272        * The application can't do anything with the display surface until
   273        * a video mode has been set anyway. :)
   274        */
   275 	/* If we have a palettized surface, create a default palette */
   276 	if ( SDL_VideoSurface->format->palette ) {
   277 		SDL_PixelFormat *vf = SDL_VideoSurface->format;
   278 		SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   279 		video->SetColors(video,
   280 				 0, vf->palette->ncolors, vf->palette->colors);
   281 	}
   282 #endif
   283 	video->info.vfmt = SDL_VideoSurface->format;
   284 
   285 	/* Start the event loop */
   286 	if ( SDL_StartEventLoop(flags) < 0 ) {
   287 		SDL_VideoQuit();
   288 		return(-1);
   289 	}
   290 	SDL_CursorInit(flags & SDL_INIT_EVENTTHREAD);
   291 
   292 	/* We're ready to go! */
   293 	return(0);
   294 }
   295 
   296 char *SDL_VideoDriverName(char *namebuf, int maxlen)
   297 {
   298 	if ( current_video != NULL ) {
   299 		strncpy(namebuf, current_video->name, maxlen-1);
   300 		namebuf[maxlen-1] = '\0';
   301 		return(namebuf);
   302 	}
   303 	return(NULL);
   304 }
   305 
   306 /*
   307  * Get the current display surface
   308  */
   309 SDL_Surface *SDL_GetVideoSurface(void)
   310 {
   311 	SDL_Surface *visible;
   312 
   313 	visible = NULL;
   314 	if ( current_video ) {
   315 		visible = current_video->visible;
   316 	}
   317 	return(visible);
   318 }
   319 
   320 /*
   321  * Get the current information about the video hardware
   322  */
   323 const SDL_VideoInfo *SDL_GetVideoInfo(void)
   324 {
   325 	const SDL_VideoInfo *info;
   326 
   327 	info = NULL;
   328 	if ( current_video ) {
   329 		info = &current_video->info;
   330 	}
   331 	return(info);
   332 }
   333 
   334 /*
   335  * Return a pointer to an array of available screen dimensions for the
   336  * given format, sorted largest to smallest.  Returns NULL if there are
   337  * no dimensions available for a particular format, or (SDL_Rect **)-1
   338  * if any dimension is okay for the given format.  If 'format' is NULL,
   339  * the mode list will be for the format given by SDL_GetVideoInfo()->vfmt
   340  */
   341 SDL_Rect ** SDL_ListModes (SDL_PixelFormat *format, Uint32 flags)
   342 {
   343 	SDL_VideoDevice *video = current_video;
   344 	SDL_VideoDevice *this  = current_video;
   345 	SDL_Rect **modes;
   346 
   347 	modes = NULL;
   348 	if ( SDL_VideoSurface ) {
   349 		if ( format == NULL ) {
   350 			format = SDL_VideoSurface->format;
   351 		}
   352 		modes = video->ListModes(this, format, flags);
   353 	}
   354 	return(modes);
   355 }
   356 
   357 /*
   358  * Check to see if a particular video mode is supported.
   359  * It returns 0 if the requested mode is not supported under any bit depth,
   360  * or returns the bits-per-pixel of the closest available mode with the
   361  * given width and height.  If this bits-per-pixel is different from the
   362  * one used when setting the video mode, SDL_SetVideoMode() will succeed,
   363  * but will emulate the requested bits-per-pixel with a shadow surface.
   364  */
   365 static Uint8 SDL_closest_depths[4][8] = {
   366 	/* 8 bit closest depth ordering */
   367 	{ 0, 8, 16, 15, 32, 24, 0, 0 },
   368 	/* 15,16 bit closest depth ordering */
   369 	{ 0, 16, 15, 32, 24, 8, 0, 0 },
   370 	/* 24 bit closest depth ordering */
   371 	{ 0, 24, 32, 16, 15, 8, 0, 0 },
   372 	/* 32 bit closest depth ordering */
   373 	{ 0, 32, 16, 15, 24, 8, 0, 0 }
   374 };
   375 
   376 
   377 #ifdef macintosh /* MPW optimization bug? */
   378 #define NEGATIVE_ONE 0xFFFFFFFF
   379 #else
   380 #define NEGATIVE_ONE -1
   381 #endif
   382 
   383 int SDL_VideoModeOK (int width, int height, int bpp, Uint32 flags)
   384 {
   385 	int table, b, i;
   386 	int supported;
   387 	SDL_PixelFormat format;
   388 	SDL_Rect **sizes;
   389 
   390 	/* Currently 1 and 4 bpp are not supported */
   391 	if ( bpp < 8 || bpp > 32 ) {
   392 		return(0);
   393 	}
   394 	if ( (width <= 0) || (height <= 0) ) {
   395 		return(0);
   396 	}
   397 
   398 	/* Search through the list valid of modes */
   399 	memset(&format, 0, sizeof(format));
   400 	supported = 0;
   401 	table = ((bpp+7)/8)-1;
   402 	SDL_closest_depths[table][0] = bpp;
   403 	SDL_closest_depths[table][7] = 0;
   404 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   405 		format.BitsPerPixel = SDL_closest_depths[table][b];
   406 		sizes = SDL_ListModes(&format, flags);
   407 		if ( sizes == (SDL_Rect **)0 ) {
   408 			/* No sizes supported at this bit-depth */
   409 			continue;
   410 		} else 
   411 		if (sizes == (SDL_Rect **)NEGATIVE_ONE) {
   412 			/* Any size supported at this bit-depth */
   413 			supported = 1;
   414 			continue;
   415 		} else if (current_video->handles_any_size) {
   416 			/* Driver can center a smaller surface to simulate fullscreen */
   417 			for ( i=0; sizes[i]; ++i ) {
   418 				if ((sizes[i]->w >= width) && (sizes[i]->h >= height)) {
   419 					supported = 1; /* this mode can fit the centered window. */
   420 					break;
   421 				}
   422 			}
   423 		} else
   424 		for ( i=0; sizes[i]; ++i ) {
   425 			if ((sizes[i]->w == width) && (sizes[i]->h == height)) {
   426 				supported = 1;
   427 				break;
   428 			}
   429 		}
   430 	}
   431 	if ( supported ) {
   432 		--b;
   433 		return(SDL_closest_depths[table][b]);
   434 	} else {
   435 		return(0);
   436 	}
   437 }
   438 
   439 /*
   440  * Get the closest non-emulated video mode to the one requested
   441  */
   442 static int SDL_GetVideoMode (int *w, int *h, int *BitsPerPixel, Uint32 flags)
   443 {
   444 	int table, b, i;
   445 	int supported;
   446 	int native_bpp;
   447 	SDL_PixelFormat format;
   448 	SDL_Rect **sizes;
   449 
   450 	/* Check parameters */
   451 	if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {
   452 		SDL_SetError("Invalid bits per pixel (range is {8...32})");
   453 		return(0);
   454 	}
   455 	if ((*w <= 0) || (*h <= 0)) {
   456 		SDL_SetError("Invalid width or height");
   457 		return(0);
   458 	}
   459 
   460 	/* Try the original video mode, get the closest depth */
   461 	native_bpp = SDL_VideoModeOK(*w, *h, *BitsPerPixel, flags);
   462 	if ( native_bpp == *BitsPerPixel ) {
   463 		return(1);
   464 	}
   465 	if ( native_bpp > 0 ) {
   466 		*BitsPerPixel = native_bpp;
   467 		return(1);
   468 	}
   469 
   470 	/* No exact size match at any depth, look for closest match */
   471 	memset(&format, 0, sizeof(format));
   472 	supported = 0;
   473 	table = ((*BitsPerPixel+7)/8)-1;
   474 	SDL_closest_depths[table][0] = *BitsPerPixel;
   475 	SDL_closest_depths[table][7] = SDL_VideoSurface->format->BitsPerPixel;
   476 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   477 		int best;
   478 
   479 		format.BitsPerPixel = SDL_closest_depths[table][b];
   480 		sizes = SDL_ListModes(&format, flags);
   481 		if ( sizes == (SDL_Rect **)0 ) {
   482 			/* No sizes supported at this bit-depth */
   483 			continue;
   484 		}
   485 		best=0;
   486 		for ( i=0; sizes[i]; ++i ) {
   487 			/* Mode with both dimensions bigger or equal than asked ? */
   488 			if ((sizes[i]->w >= *w) && (sizes[i]->h >= *h)) {
   489 				/* Mode with any dimension smaller or equal than current best ? */
   490 				if ((sizes[i]->w <= sizes[best]->w) || (sizes[i]->h <= sizes[best]->h)) {
   491 					best=i;
   492 					supported = 1;
   493 				}
   494 			}
   495 		}
   496 		if (supported) {
   497 			*w=sizes[best]->w;
   498 			*h=sizes[best]->h;
   499 			*BitsPerPixel = SDL_closest_depths[table][b];
   500 		}
   501 	}
   502 	if ( ! supported ) {
   503 		SDL_SetError("No video mode large enough for %dx%d", *w, *h);
   504 	}
   505 	return(supported);
   506 }
   507 
   508 /* This should probably go somewhere else -- like SDL_surface.c */
   509 static void SDL_ClearSurface(SDL_Surface *surface)
   510 {
   511 	Uint32 black;
   512 
   513 	black = SDL_MapRGB(surface->format, 0, 0, 0);
   514 	SDL_FillRect(surface, NULL, black);
   515 	if ((surface->flags&SDL_HWSURFACE) && (surface->flags&SDL_DOUBLEBUF)) {
   516 		SDL_Flip(surface);
   517 		SDL_FillRect(surface, NULL, black);
   518 	}
   519 	SDL_Flip(surface);
   520 }
   521 
   522 /*
   523  * Create a shadow surface suitable for fooling the app. :-)
   524  */
   525 static void SDL_CreateShadowSurface(int depth)
   526 {
   527 	Uint32 Rmask, Gmask, Bmask;
   528 
   529 	/* Allocate the shadow surface */
   530 	if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   531 		Rmask = (SDL_VideoSurface->format)->Rmask;
   532 		Gmask = (SDL_VideoSurface->format)->Gmask;
   533 		Bmask = (SDL_VideoSurface->format)->Bmask;
   534 	} else {
   535 		Rmask = Gmask = Bmask = 0;
   536 	}
   537 	SDL_ShadowSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,
   538 				SDL_VideoSurface->w, SDL_VideoSurface->h,
   539 						depth, Rmask, Gmask, Bmask, 0);
   540 	if ( SDL_ShadowSurface == NULL ) {
   541 		return;
   542 	}
   543 
   544 	/* 8-bit shadow surfaces report that they have exclusive palette */
   545 	if ( SDL_ShadowSurface->format->palette ) {
   546 		SDL_ShadowSurface->flags |= SDL_HWPALETTE;
   547 		if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   548 			memcpy(SDL_ShadowSurface->format->palette->colors,
   549 				SDL_VideoSurface->format->palette->colors,
   550 				SDL_VideoSurface->format->palette->ncolors*
   551 							sizeof(SDL_Color));
   552 		} else {
   553 			SDL_DitherColors(
   554 			SDL_ShadowSurface->format->palette->colors, depth);
   555 		}
   556 	}
   557 
   558 	/* If the video surface is resizable, the shadow should say so */
   559 	if ( (SDL_VideoSurface->flags & SDL_RESIZABLE) == SDL_RESIZABLE ) {
   560 		SDL_ShadowSurface->flags |= SDL_RESIZABLE;
   561 	}
   562 	/* If the video surface has no frame, the shadow should say so */
   563 	if ( (SDL_VideoSurface->flags & SDL_NOFRAME) == SDL_NOFRAME ) {
   564 		SDL_ShadowSurface->flags |= SDL_NOFRAME;
   565 	}
   566 	/* If the video surface is fullscreen, the shadow should say so */
   567 	if ( (SDL_VideoSurface->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
   568 		SDL_ShadowSurface->flags |= SDL_FULLSCREEN;
   569 	}
   570 	/* If the video surface is flippable, the shadow should say so */
   571 	if ( (SDL_VideoSurface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   572 		SDL_ShadowSurface->flags |= SDL_DOUBLEBUF;
   573 	}
   574 	return;
   575 }
   576 
   577 #ifdef __QNXNTO__
   578     #include <sys/neutrino.h>
   579 #endif /* __QNXNTO__ */
   580 
   581 /*
   582  * Set the requested video mode, allocating a shadow buffer if necessary.
   583  */
   584 SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)
   585 {
   586 	SDL_VideoDevice *video, *this;
   587 	SDL_Surface *prev_mode, *mode;
   588 	int video_w;
   589 	int video_h;
   590 	int video_bpp;
   591 	int is_opengl;
   592 	SDL_GrabMode saved_grab;
   593 
   594 	/* Start up the video driver, if necessary..
   595 	   WARNING: This is the only function protected this way!
   596 	 */
   597 	if ( ! current_video ) {
   598 		if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) {
   599 			return(NULL);
   600 		}
   601 	}
   602 	this = video = current_video;
   603 
   604 	/* Default to the current video bpp */
   605 	if ( bpp == 0 ) {
   606 		flags |= SDL_ANYFORMAT;
   607 		bpp = SDL_VideoSurface->format->BitsPerPixel;
   608 	}
   609 
   610 	/* Get a good video mode, the closest one possible */
   611 	video_w = width;
   612 	video_h = height;
   613 	video_bpp = bpp;
   614 	if ( ! SDL_GetVideoMode(&video_w, &video_h, &video_bpp, flags) ) {
   615 		return(NULL);
   616 	}
   617 
   618 	/* Check the requested flags */
   619 	/* There's no palette in > 8 bits-per-pixel mode */
   620 	if ( video_bpp > 8 ) {
   621 		flags &= ~SDL_HWPALETTE;
   622 	}
   623 #if 0
   624 	if ( (flags&SDL_FULLSCREEN) != SDL_FULLSCREEN ) {
   625 		/* There's no windowed double-buffering */
   626 		flags &= ~SDL_DOUBLEBUF;
   627 	}
   628 #endif
   629 	if ( (flags&SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   630 		/* Use hardware surfaces when double-buffering */
   631 		flags |= SDL_HWSURFACE;
   632 	}
   633 
   634 	is_opengl = ( ( flags & SDL_OPENGL ) == SDL_OPENGL );
   635 	if ( is_opengl ) {
   636 		/* These flags are for 2D video modes only */
   637 		flags &= ~(SDL_HWSURFACE|SDL_DOUBLEBUF);
   638 	}
   639 
   640 	/* Reset the keyboard here so event callbacks can run */
   641 	SDL_ResetKeyboard();
   642 	SDL_ResetMouse();
   643 
   644 	/* Clean up any previous video mode */
   645 	if ( SDL_PublicSurface != NULL ) {
   646 		SDL_PublicSurface = NULL;
   647 	}
   648 	if ( SDL_ShadowSurface != NULL ) {
   649 		SDL_Surface *ready_to_go;
   650 		ready_to_go = SDL_ShadowSurface;
   651 		SDL_ShadowSurface = NULL;
   652 		SDL_FreeSurface(ready_to_go);
   653 	}
   654 	if ( video->physpal ) {
   655 		free(video->physpal->colors);
   656 		free(video->physpal);
   657 		video->physpal = NULL;
   658 	}
   659 	if( video->gammacols) {
   660 		free(video->gammacols);
   661 		video->gammacols = NULL;
   662 	}
   663 
   664 	/* Save the previous grab state and turn off grab for mode switch */
   665 	saved_grab = SDL_WM_GrabInputOff();
   666 
   667 	/* Try to set the video mode, along with offset and clipping */
   668 	prev_mode = SDL_VideoSurface;
   669 	SDL_LockCursor();
   670 	SDL_VideoSurface = NULL;	/* In case it's freed by driver */
   671 	mode = video->SetVideoMode(this, prev_mode,video_w,video_h,video_bpp,flags);
   672 	if ( mode ) { /* Prevent resize events from mode change */
   673           /* But not on OS/2 */
   674 #ifndef __OS2__
   675 	    SDL_PrivateResize(mode->w, mode->h);
   676 #endif
   677 
   678 	    /* Sam - If we asked for OpenGL mode, and didn't get it, fail */
   679 	    if ( is_opengl && !(mode->flags & SDL_OPENGL) ) {
   680 		mode = NULL;
   681 		SDL_SetError("OpenGL not available");
   682 	    }
   683 	}
   684 	/*
   685 	 * rcg11292000
   686 	 * If you try to set an SDL_OPENGL surface, and fail to find a
   687 	 * matching  visual, then the next call to SDL_SetVideoMode()
   688 	 * will segfault, since  we no longer point to a dummy surface,
   689 	 * but rather NULL.
   690 	 * Sam 11/29/00
   691 	 * WARNING, we need to make sure that the previous mode hasn't
   692 	 * already been freed by the video driver.  What do we do in
   693 	 * that case?  Should we call SDL_VideoInit() again?
   694 	 */
   695 	SDL_VideoSurface = (mode != NULL) ? mode : prev_mode;
   696 
   697 	if ( (mode != NULL) && (!is_opengl) ) {
   698 		/* Sanity check */
   699 		if ( (mode->w < width) || (mode->h < height) ) {
   700 			SDL_SetError("Video mode smaller than requested");
   701 			return(NULL);
   702 		}
   703 
   704 		/* If we have a palettized surface, create a default palette */
   705 		if ( mode->format->palette ) {
   706 			SDL_PixelFormat *vf = mode->format;
   707 			SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   708 			video->SetColors(this, 0, vf->palette->ncolors,
   709 			                           vf->palette->colors);
   710 		}
   711 
   712 		/* Clear the surface to black */
   713 		video->offset_x = 0;
   714 		video->offset_y = 0;
   715 		mode->offset = 0;
   716 		SDL_SetClipRect(mode, NULL);
   717 		SDL_ClearSurface(mode);
   718 
   719 		/* Now adjust the offsets to match the desired mode */
   720 		video->offset_x = (mode->w-width)/2;
   721 		video->offset_y = (mode->h-height)/2;
   722 		mode->offset = video->offset_y*mode->pitch +
   723 				video->offset_x*mode->format->BytesPerPixel;
   724 #ifdef DEBUG_VIDEO
   725   fprintf(stderr,
   726 	"Requested mode: %dx%dx%d, obtained mode %dx%dx%d (offset %d)\n",
   727 		width, height, bpp,
   728 		mode->w, mode->h, mode->format->BitsPerPixel, mode->offset);
   729 #endif
   730 		mode->w = width;
   731 		mode->h = height;
   732 		SDL_SetClipRect(mode, NULL);
   733 	}
   734 	SDL_ResetCursor();
   735 	SDL_UnlockCursor();
   736 
   737 	/* If we failed setting a video mode, return NULL... (Uh Oh!) */
   738 	if ( mode == NULL ) {
   739 		return(NULL);
   740 	}
   741 
   742 	/* If there is no window manager, set the SDL_NOFRAME flag */
   743 	if ( ! video->info.wm_available ) {
   744 		mode->flags |= SDL_NOFRAME;
   745 	}
   746 
   747 	/* Reset the mouse cursor and grab for new video mode */
   748 	SDL_SetCursor(NULL);
   749 	if ( video->UpdateMouse ) {
   750 		video->UpdateMouse(this);
   751 	}
   752 	SDL_WM_GrabInput(saved_grab);
   753 	SDL_GetRelativeMouseState(NULL, NULL); /* Clear first large delta */
   754 
   755 #ifdef HAVE_OPENGL
   756 	/* Load GL symbols (before MakeCurrent, where we need glGetString). */
   757 	if ( flags & (SDL_OPENGL | SDL_OPENGLBLIT) ) {
   758 
   759 #if defined(__QNXNTO__) && (_NTO_VERSION < 630)
   760 #define __SDL_NOGETPROCADDR__
   761 #elif defined(__MINT__)
   762 #define __SDL_NOGETPROCADDR__
   763 #endif
   764 #ifdef __SDL_NOGETPROCADDR__
   765     #define SDL_PROC(ret,func,params) video->func=func;
   766 #else
   767     #define SDL_PROC(ret,func,params) \
   768     do { \
   769         video->func = SDL_GL_GetProcAddress(#func); \
   770         if ( ! video->func ) { \
   771             SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \
   772         return(NULL); \
   773         } \
   774     } while ( 0 );
   775 
   776 #endif /* __SDL_NOGETPROCADDR__ */
   777 
   778 #include "SDL_glfuncs.h"
   779 #undef SDL_PROC	
   780 	}
   781 #endif /* HAVE_OPENGL */
   782 
   783 	/* If we're running OpenGL, make the context current */
   784 	if ( (video->screen->flags & SDL_OPENGL) &&
   785 	      video->GL_MakeCurrent ) {
   786 		if ( video->GL_MakeCurrent(this) < 0 ) {
   787 			return(NULL);
   788 		}
   789 	}
   790 
   791 	/* Set up a fake SDL surface for OpenGL "blitting" */
   792 	if ( (flags & SDL_OPENGLBLIT) == SDL_OPENGLBLIT ) {
   793 		/* Load GL functions for performing the texture updates */
   794 #ifdef HAVE_OPENGL
   795 
   796 		/* Create a software surface for blitting */
   797 #ifdef GL_VERSION_1_2
   798 		/* If the implementation either supports the packed pixels
   799 		   extension, or implements the core OpenGL 1.2 API, it will
   800 		   support the GL_UNSIGNED_SHORT_5_6_5 texture format.
   801 		 */
   802 		if ( (bpp == 16) &&
   803 		     (strstr((const char *)video->glGetString(GL_EXTENSIONS), "GL_EXT_packed_pixels") ||
   804 		     (atof((const char *)video->glGetString(GL_VERSION)) >= 1.2f))
   805 		   ) {
   806 			video->is_32bit = 0;
   807 			SDL_VideoSurface = SDL_CreateRGBSurface(
   808 				flags, 
   809 				width, 
   810 				height,  
   811 				16,
   812 				31 << 11,
   813 				63 << 5,
   814 				31,
   815 				0
   816 				);
   817 		}
   818 		else
   819 #endif /* OpenGL 1.2 */
   820 		{
   821 			video->is_32bit = 1;
   822 			SDL_VideoSurface = SDL_CreateRGBSurface(
   823 				flags, 
   824 				width, 
   825 				height, 
   826 				32, 
   827 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   828 				0x000000FF,
   829 				0x0000FF00,
   830 				0x00FF0000,
   831 				0xFF000000
   832 #else
   833 				0xFF000000,
   834 				0x00FF0000,
   835 				0x0000FF00,
   836 				0x000000FF
   837 #endif
   838 				);
   839 		}
   840 		if ( ! SDL_VideoSurface ) {
   841 			return(NULL);
   842 		}
   843 		SDL_VideoSurface->flags = mode->flags | SDL_OPENGLBLIT;
   844 
   845 		/* Free the original video mode surface (is this safe?) */
   846 		SDL_FreeSurface(mode);
   847 
   848 		/* Set the surface completely opaque & white by default */
   849 		memset( SDL_VideoSurface->pixels, 255, SDL_VideoSurface->h * SDL_VideoSurface->pitch );
   850 		video->glGenTextures( 1, &video->texture );
   851 		video->glBindTexture( GL_TEXTURE_2D, video->texture );
   852 		video->glTexImage2D(
   853 			GL_TEXTURE_2D,
   854 			0,
   855 			video->is_32bit ? GL_RGBA : GL_RGB,
   856 			256,
   857 			256,
   858 			0,
   859 			video->is_32bit ? GL_RGBA : GL_RGB,
   860 #ifdef GL_VERSION_1_2
   861 			video->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
   862 #else
   863 			GL_UNSIGNED_BYTE,
   864 #endif
   865 			NULL);
   866 
   867 		video->UpdateRects = SDL_GL_UpdateRectsLock;
   868 #else
   869 		SDL_SetError("Somebody forgot to #define HAVE_OPENGL");
   870 		return(NULL);
   871 #endif
   872 	}
   873 
   874 	/* Create a shadow surface if necessary */
   875 	/* There are three conditions under which we create a shadow surface:
   876 		1.  We need a particular bits-per-pixel that we didn't get.
   877 		2.  We need a hardware palette and didn't get one.
   878 		3.  We need a software surface and got a hardware surface.
   879 	*/
   880 	if ( !(SDL_VideoSurface->flags & SDL_OPENGL) &&
   881 	     (
   882 	     (  !(flags&SDL_ANYFORMAT) &&
   883 			(SDL_VideoSurface->format->BitsPerPixel != bpp)) ||
   884 	     (   (flags&SDL_HWPALETTE) && 
   885 				!(SDL_VideoSurface->flags&SDL_HWPALETTE)) ||
   886 		/* If the surface is in hardware, video writes are visible
   887 		   as soon as they are performed, so we need to buffer them
   888 		 */
   889 	     (   ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) &&
   890 				(SDL_VideoSurface->flags&SDL_HWSURFACE)) ||
   891 	     (   (flags&SDL_DOUBLEBUF) &&
   892 				(SDL_VideoSurface->flags&SDL_HWSURFACE) &&
   893 				!(SDL_VideoSurface->flags&SDL_DOUBLEBUF))
   894 	     ) ) {
   895 		SDL_CreateShadowSurface(bpp);
   896 		if ( SDL_ShadowSurface == NULL ) {
   897 			SDL_SetError("Couldn't create shadow surface");
   898 			return(NULL);
   899 		}
   900 		SDL_PublicSurface = SDL_ShadowSurface;
   901 	} else {
   902 		SDL_PublicSurface = SDL_VideoSurface;
   903 	}
   904 	video->info.vfmt = SDL_VideoSurface->format;
   905 
   906 	/* We're done! */
   907 	return(SDL_PublicSurface);
   908 }
   909 
   910 /* 
   911  * Convert a surface into the video pixel format.
   912  */
   913 SDL_Surface * SDL_DisplayFormat (SDL_Surface *surface)
   914 {
   915 	Uint32 flags;
   916 
   917 	if ( ! SDL_PublicSurface ) {
   918 		SDL_SetError("No video mode has been set");
   919 		return(NULL);
   920 	}
   921 	/* Set the flags appropriate for copying to display surface */
   922 	if (((SDL_PublicSurface->flags&SDL_HWSURFACE) == SDL_HWSURFACE) && current_video->info.blit_hw)
   923 		flags = SDL_HWSURFACE;
   924 	else 
   925 		flags = SDL_SWSURFACE;
   926 #ifdef AUTORLE_DISPLAYFORMAT
   927 	flags |= (surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA));
   928 	flags |= SDL_RLEACCELOK;
   929 #else
   930 	flags |= surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA|SDL_RLEACCELOK);
   931 #endif
   932 	return(SDL_ConvertSurface(surface, SDL_PublicSurface->format, flags));
   933 }
   934 
   935 /*
   936  * Convert a surface into a format that's suitable for blitting to
   937  * the screen, but including an alpha channel.
   938  */
   939 SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface)
   940 {
   941 	SDL_PixelFormat *vf;
   942 	SDL_PixelFormat *format;
   943 	SDL_Surface *converted;
   944 	Uint32 flags;
   945 	/* default to ARGB8888 */
   946 	Uint32 amask = 0xff000000;
   947 	Uint32 rmask = 0x00ff0000;
   948 	Uint32 gmask = 0x0000ff00;
   949 	Uint32 bmask = 0x000000ff;
   950 
   951 	if ( ! SDL_PublicSurface ) {
   952 		SDL_SetError("No video mode has been set");
   953 		return(NULL);
   954 	}
   955 	vf = SDL_PublicSurface->format;
   956 
   957 	switch(vf->BytesPerPixel) {
   958 	    case 2:
   959 		/* For XGY5[56]5, use, AXGY8888, where {X, Y} = {R, B}.
   960 		   For anything else (like ARGB4444) it doesn't matter
   961 		   since we have no special code for it anyway */
   962 		if ( (vf->Rmask == 0x1f) &&
   963 		     (vf->Bmask == 0xf800 || vf->Bmask == 0x7c00)) {
   964 			rmask = 0xff;
   965 			bmask = 0xff0000;
   966 		}
   967 		break;
   968 
   969 	    case 3:
   970 	    case 4:
   971 		/* Keep the video format, as long as the high 8 bits are
   972 		   unused or alpha */
   973 		if ( (vf->Rmask == 0xff) && (vf->Bmask == 0xff0000) ) {
   974 			rmask = 0xff;
   975 			bmask = 0xff0000;
   976 		}
   977 		break;
   978 
   979 	    default:
   980 		/* We have no other optimised formats right now. When/if a new
   981 		   optimised alpha format is written, add the converter here */
   982 		break;
   983 	}
   984 	format = SDL_AllocFormat(32, rmask, gmask, bmask, amask);
   985 	flags = SDL_PublicSurface->flags & SDL_HWSURFACE;
   986 	flags |= surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
   987 	converted = SDL_ConvertSurface(surface, format, flags);
   988 	SDL_FreeFormat(format);
   989 	return(converted);
   990 }
   991 
   992 /*
   993  * Update a specific portion of the physical screen
   994  */
   995 void SDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
   996 {
   997 	if ( screen ) {
   998 		SDL_Rect rect;
   999 
  1000 		/* Perform some checking */
  1001 		if ( w == 0 )
  1002 			w = screen->w;
  1003 		if ( h == 0 )
  1004 			h = screen->h;
  1005 		if ( (int)(x+w) > screen->w )
  1006 			return;
  1007 		if ( (int)(y+h) > screen->h )
  1008 			return;
  1009 
  1010 		/* Fill the rectangle */
  1011 		rect.x = x;
  1012 		rect.y = y;
  1013 		rect.w = w;
  1014 		rect.h = h;
  1015 		SDL_UpdateRects(screen, 1, &rect);
  1016 	}
  1017 }
  1018 void SDL_UpdateRects (SDL_Surface *screen, int numrects, SDL_Rect *rects)
  1019 {
  1020 	int i;
  1021 	SDL_VideoDevice *video = current_video;
  1022 	SDL_VideoDevice *this = current_video;
  1023 
  1024 	if ( screen == SDL_ShadowSurface ) {
  1025 		/* Blit the shadow surface using saved mapping */
  1026 		SDL_Palette *pal = screen->format->palette;
  1027 		SDL_Color *saved_colors = NULL;
  1028 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1029 			/* simulated 8bpp, use correct physical palette */
  1030 			saved_colors = pal->colors;
  1031 			if ( video->gammacols ) {
  1032 				/* gamma-corrected palette */
  1033 				pal->colors = video->gammacols;
  1034 			} else if ( video->physpal ) {
  1035 				/* physical palette different from logical */
  1036 				pal->colors = video->physpal->colors;
  1037 			}
  1038 		}
  1039 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1040 			SDL_LockCursor();
  1041 			SDL_DrawCursor(SDL_ShadowSurface);
  1042 			for ( i=0; i<numrects; ++i ) {
  1043 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1044 						SDL_VideoSurface, &rects[i]);
  1045 			}
  1046 			SDL_EraseCursor(SDL_ShadowSurface);
  1047 			SDL_UnlockCursor();
  1048 		} else {
  1049 			for ( i=0; i<numrects; ++i ) {
  1050 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1051 						SDL_VideoSurface, &rects[i]);
  1052 			}
  1053 		}
  1054 		if ( saved_colors ) {
  1055 			pal->colors = saved_colors;
  1056 		}
  1057 
  1058 		/* Fall through to video surface update */
  1059 		screen = SDL_VideoSurface;
  1060 	}
  1061 	if ( screen == SDL_VideoSurface ) {
  1062 		/* Update the video surface */
  1063 		if ( screen->offset ) {
  1064 			for ( i=0; i<numrects; ++i ) {
  1065 				rects[i].x += video->offset_x;
  1066 				rects[i].y += video->offset_y;
  1067 			}
  1068 			video->UpdateRects(this, numrects, rects);
  1069 			for ( i=0; i<numrects; ++i ) {
  1070 				rects[i].x -= video->offset_x;
  1071 				rects[i].y -= video->offset_y;
  1072 			}
  1073 		} else {
  1074 			video->UpdateRects(this, numrects, rects);
  1075 		}
  1076 	}
  1077 }
  1078 
  1079 /*
  1080  * Performs hardware double buffering, if possible, or a full update if not.
  1081  */
  1082 int SDL_Flip(SDL_Surface *screen)
  1083 {
  1084 	SDL_VideoDevice *video = current_video;
  1085 	/* Copy the shadow surface to the video surface */
  1086 	if ( screen == SDL_ShadowSurface ) {
  1087 		SDL_Rect rect;
  1088 		SDL_Palette *pal = screen->format->palette;
  1089 		SDL_Color *saved_colors = NULL;
  1090 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1091 			/* simulated 8bpp, use correct physical palette */
  1092 			saved_colors = pal->colors;
  1093 			if ( video->gammacols ) {
  1094 				/* gamma-corrected palette */
  1095 				pal->colors = video->gammacols;
  1096 			} else if ( video->physpal ) {
  1097 				/* physical palette different from logical */
  1098 				pal->colors = video->physpal->colors;
  1099 			}
  1100 		}
  1101 
  1102 		rect.x = 0;
  1103 		rect.y = 0;
  1104 		rect.w = screen->w;
  1105 		rect.h = screen->h;
  1106 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1107 			SDL_LockCursor();
  1108 			SDL_DrawCursor(SDL_ShadowSurface);
  1109 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1110 					SDL_VideoSurface, &rect);
  1111 			SDL_EraseCursor(SDL_ShadowSurface);
  1112 			SDL_UnlockCursor();
  1113 		} else {
  1114 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1115 					SDL_VideoSurface, &rect);
  1116 		}
  1117 		if ( saved_colors ) {
  1118 			pal->colors = saved_colors;
  1119 		}
  1120 
  1121 		/* Fall through to video surface update */
  1122 		screen = SDL_VideoSurface;
  1123 	}
  1124 	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
  1125 		SDL_VideoDevice *this  = current_video;
  1126 		return(video->FlipHWSurface(this, SDL_VideoSurface));
  1127 	} else {
  1128 		SDL_UpdateRect(screen, 0, 0, 0, 0);
  1129 	}
  1130 	return(0);
  1131 }
  1132 
  1133 static void SetPalette_logical(SDL_Surface *screen, SDL_Color *colors,
  1134 			       int firstcolor, int ncolors)
  1135 {
  1136 	SDL_Palette *pal = screen->format->palette;
  1137 	SDL_Palette *vidpal;
  1138 
  1139 	if ( colors != (pal->colors + firstcolor) ) {
  1140 		memcpy(pal->colors + firstcolor, colors,
  1141 		       ncolors * sizeof(*colors));
  1142 	}
  1143 
  1144 	vidpal = SDL_VideoSurface->format->palette;
  1145 	if ( (screen == SDL_ShadowSurface) && vidpal ) {
  1146 		/*
  1147 		 * This is a shadow surface, and the physical
  1148 		 * framebuffer is also indexed. Propagate the
  1149 		 * changes to its logical palette so that
  1150 		 * updates are always identity blits
  1151 		 */
  1152 		memcpy(vidpal->colors + firstcolor, colors,
  1153 		       ncolors * sizeof(*colors));
  1154 	}
  1155 	SDL_FormatChanged(screen);
  1156 }
  1157 
  1158 static int SetPalette_physical(SDL_Surface *screen,
  1159                                SDL_Color *colors, int firstcolor, int ncolors)
  1160 {
  1161 	SDL_VideoDevice *video = current_video;
  1162 	int gotall = 1;
  1163 
  1164 	if ( video->physpal ) {
  1165 		/* We need to copy the new colors, since we haven't
  1166 		 * already done the copy in the logical set above.
  1167 		 */
  1168 		memcpy(video->physpal->colors + firstcolor,
  1169 		       colors, ncolors * sizeof(*colors));
  1170 	}
  1171 	if ( screen == SDL_ShadowSurface ) {
  1172 		if ( SDL_VideoSurface->flags & SDL_HWPALETTE ) {
  1173 			/*
  1174 			 * The real screen is also indexed - set its physical
  1175 			 * palette. The physical palette does not include the
  1176 			 * gamma modification, we apply it directly instead,
  1177 			 * but this only happens if we have hardware palette.
  1178 			 */
  1179 			screen = SDL_VideoSurface;
  1180 		} else {
  1181 			/*
  1182 			 * The video surface is not indexed - invalidate any
  1183 			 * active shadow-to-video blit mappings.
  1184 			 */
  1185 			if ( screen->map->dst == SDL_VideoSurface ) {
  1186 				SDL_InvalidateMap(screen->map);
  1187 			}
  1188 			if ( video->gamma ) {
  1189 				if( ! video->gammacols ) {
  1190 					SDL_Palette *pp = video->physpal;
  1191 					if(!pp)
  1192 						pp = screen->format->palette;
  1193 					video->gammacols = malloc(pp->ncolors
  1194 							  * sizeof(SDL_Color));
  1195 					SDL_ApplyGamma(video->gamma,
  1196 						       pp->colors,
  1197 						       video->gammacols,
  1198 						       pp->ncolors);
  1199 				} else {
  1200 					SDL_ApplyGamma(video->gamma, colors,
  1201 						       video->gammacols
  1202 						       + firstcolor,
  1203 						       ncolors);
  1204 				}
  1205 			}
  1206 			SDL_UpdateRect(screen, 0, 0, 0, 0);
  1207 		}
  1208 	}
  1209 
  1210 	if ( screen == SDL_VideoSurface ) {
  1211 		SDL_Color gcolors[256];
  1212 
  1213 		if ( video->gamma ) {
  1214 			SDL_ApplyGamma(video->gamma, colors, gcolors, ncolors);
  1215 			colors = gcolors;
  1216 		}
  1217 		gotall = video->SetColors(video, firstcolor, ncolors, colors);
  1218 		if ( ! gotall ) {
  1219 			/* The video flags shouldn't have SDL_HWPALETTE, and
  1220 			   the video driver is responsible for copying back the
  1221 			   correct colors into the video surface palette.
  1222 			*/
  1223 			;
  1224 		}
  1225 		SDL_CursorPaletteChanged();
  1226 	}
  1227 	return gotall;
  1228 }
  1229 
  1230 /*
  1231  * Set the physical and/or logical colormap of a surface:
  1232  * Only the screen has a physical colormap. It determines what is actually
  1233  * sent to the display.
  1234  * The logical colormap is used to map blits to/from the surface.
  1235  * 'which' is one or both of SDL_LOGPAL, SDL_PHYSPAL
  1236  *
  1237  * Return nonzero if all colours were set as requested, or 0 otherwise.
  1238  */
  1239 int SDL_SetPalette(SDL_Surface *screen, int which,
  1240 		   SDL_Color *colors, int firstcolor, int ncolors)
  1241 {
  1242 	SDL_Palette *pal;
  1243 	int gotall;
  1244 	int palsize;
  1245 
  1246 	if ( ! current_video ) {
  1247 		return 0;
  1248 	}
  1249 	if ( screen != SDL_PublicSurface ) {
  1250 		/* only screens have physical palettes */
  1251 		which &= ~SDL_PHYSPAL;
  1252 	} else if( (screen->flags & SDL_HWPALETTE) != SDL_HWPALETTE ) {
  1253 		/* hardware palettes required for split colormaps */
  1254 		which |= SDL_PHYSPAL | SDL_LOGPAL;
  1255 	}
  1256 
  1257 	/* Verify the parameters */
  1258 	pal = screen->format->palette;
  1259 	if( !pal ) {
  1260 		return 0;	/* not a palettized surface */
  1261 	}
  1262 	gotall = 1;
  1263 	palsize = 1 << screen->format->BitsPerPixel;
  1264 	if ( ncolors > (palsize - firstcolor) ) {
  1265 		ncolors = (palsize - firstcolor);
  1266 		gotall = 0;
  1267 	}
  1268 
  1269 	if ( which & SDL_LOGPAL ) {
  1270 		/*
  1271 		 * Logical palette change: The actual screen isn't affected,
  1272 		 * but the internal colormap is altered so that the
  1273 		 * interpretation of the pixel values (for blits etc) is
  1274 		 * changed.
  1275 		 */
  1276 		SetPalette_logical(screen, colors, firstcolor, ncolors);
  1277 	}
  1278 	if ( which & SDL_PHYSPAL ) {
  1279 		SDL_VideoDevice *video = current_video;
  1280 		/*
  1281 		 * Physical palette change: This doesn't affect the
  1282 		 * program's idea of what the screen looks like, but changes
  1283 		 * its actual appearance.
  1284 		 */
  1285 		if(!video)
  1286 			return gotall;	/* video not yet initialized */
  1287 		if(!video->physpal && !(which & SDL_LOGPAL) ) {
  1288 			/* Lazy physical palette allocation */
  1289 			int size;
  1290 			SDL_Palette *pp = malloc(sizeof(*pp));
  1291 			if ( !pp ) {
  1292 				return 0;
  1293 			}
  1294 			current_video->physpal = pp;
  1295 			pp->ncolors = pal->ncolors;
  1296 			size = pp->ncolors * sizeof(SDL_Color);
  1297 			pp->colors = malloc(size);
  1298 			if ( !pp->colors ) {
  1299 				return 0;
  1300 			}
  1301 			memcpy(pp->colors, pal->colors, size);
  1302 		}
  1303 		if ( ! SetPalette_physical(screen,
  1304 		                           colors, firstcolor, ncolors) ) {
  1305 			gotall = 0;
  1306 		}
  1307 	}
  1308 	return gotall;
  1309 }
  1310 
  1311 int SDL_SetColors(SDL_Surface *screen, SDL_Color *colors, int firstcolor,
  1312 		  int ncolors)
  1313 {
  1314 	return SDL_SetPalette(screen, SDL_LOGPAL | SDL_PHYSPAL,
  1315 			      colors, firstcolor, ncolors);
  1316 }
  1317 
  1318 /*
  1319  * Clean up the video subsystem
  1320  */
  1321 void SDL_VideoQuit (void)
  1322 {
  1323 	SDL_Surface *ready_to_go;
  1324 
  1325 	if ( current_video ) {
  1326 		SDL_VideoDevice *video = current_video;
  1327 		SDL_VideoDevice *this  = current_video;
  1328 
  1329 		/* Halt event processing before doing anything else */
  1330 		SDL_StopEventLoop();
  1331 
  1332 		/* Clean up allocated window manager items */
  1333 		if ( SDL_PublicSurface ) {
  1334 			SDL_PublicSurface = NULL;
  1335 		}
  1336 		SDL_CursorQuit();
  1337 
  1338 		/* Just in case... */
  1339 		SDL_WM_GrabInputOff();
  1340 
  1341 		/* Clean up the system video */
  1342 		video->VideoQuit(this);
  1343 
  1344 		/* Free any lingering surfaces */
  1345 		ready_to_go = SDL_ShadowSurface;
  1346 		SDL_ShadowSurface = NULL;
  1347 		SDL_FreeSurface(ready_to_go);
  1348 		if ( SDL_VideoSurface != NULL ) {
  1349 			ready_to_go = SDL_VideoSurface;
  1350 			SDL_VideoSurface = NULL;
  1351 			SDL_FreeSurface(ready_to_go);
  1352 		}
  1353 		SDL_PublicSurface = NULL;
  1354 
  1355 		/* Clean up miscellaneous memory */
  1356 		if ( video->physpal ) {
  1357 			free(video->physpal->colors);
  1358 			free(video->physpal);
  1359 			video->physpal = NULL;
  1360 		}
  1361 		if ( video->gammacols ) {
  1362 			free(video->gammacols);
  1363 			video->gammacols = NULL;
  1364 		}
  1365 		if ( video->gamma ) {
  1366 			free(video->gamma);
  1367 			video->gamma = NULL;
  1368 		}
  1369 		if ( video->wm_title != NULL ) {
  1370 			free(video->wm_title);
  1371 			video->wm_title = NULL;
  1372 		}
  1373 		if ( video->wm_icon != NULL ) {
  1374 			free(video->wm_icon);
  1375 			video->wm_icon = NULL;
  1376 		}
  1377 
  1378 		/* Finish cleaning up video subsystem */
  1379 		video->free(this);
  1380 		current_video = NULL;
  1381 	}
  1382 	return;
  1383 }
  1384 
  1385 /* Load the GL driver library */
  1386 int SDL_GL_LoadLibrary(const char *path)
  1387 {
  1388 	SDL_VideoDevice *video = current_video;
  1389 	SDL_VideoDevice *this = current_video;
  1390 	int retval;
  1391 
  1392 	retval = -1;
  1393 	if ( video == NULL ) {
  1394 		SDL_SetError("Video subsystem has not been initialized");
  1395 	} else {
  1396 		if ( video->GL_LoadLibrary ) {
  1397 			retval = video->GL_LoadLibrary(this, path);
  1398 		} else {
  1399 			SDL_SetError("No dynamic GL support in video driver");
  1400 		}
  1401 	}
  1402 	return(retval);
  1403 }
  1404 
  1405 void *SDL_GL_GetProcAddress(const char* proc)
  1406 {
  1407 	SDL_VideoDevice *video = current_video;
  1408 	SDL_VideoDevice *this = current_video;
  1409 	void *func;
  1410 
  1411 	func = NULL;
  1412 	if ( video->GL_GetProcAddress ) {
  1413 		if ( video->gl_config.driver_loaded ) {
  1414 			func = video->GL_GetProcAddress(this, proc);
  1415 		} else {
  1416 			SDL_SetError("No GL driver has been loaded");
  1417 		}
  1418 	} else {
  1419 		SDL_SetError("No dynamic GL support in video driver");
  1420 	}
  1421 	return func;
  1422 }
  1423 
  1424 /* Set the specified GL attribute for setting up a GL video mode */
  1425 int SDL_GL_SetAttribute( SDL_GLattr attr, int value )
  1426 {
  1427 	int retval;
  1428 	SDL_VideoDevice *video = current_video;
  1429 
  1430 	retval = 0;
  1431 	switch (attr) {
  1432 		case SDL_GL_RED_SIZE:
  1433 			video->gl_config.red_size = value;
  1434 			break;
  1435 		case SDL_GL_GREEN_SIZE:
  1436 			video->gl_config.green_size = value;
  1437 			break;
  1438 		case SDL_GL_BLUE_SIZE:
  1439 			video->gl_config.blue_size = value;
  1440 			break;
  1441 		case SDL_GL_ALPHA_SIZE:
  1442 			video->gl_config.alpha_size = value;
  1443 			break;
  1444 		case SDL_GL_DOUBLEBUFFER:
  1445 			video->gl_config.double_buffer = value;
  1446 			break;
  1447 		case SDL_GL_BUFFER_SIZE:
  1448 			video->gl_config.buffer_size = value;
  1449 			break;
  1450 		case SDL_GL_DEPTH_SIZE:
  1451 			video->gl_config.depth_size = value;
  1452 			break;
  1453 		case SDL_GL_STENCIL_SIZE:
  1454 			video->gl_config.stencil_size = value;
  1455 			break;
  1456 		case SDL_GL_ACCUM_RED_SIZE:
  1457 			video->gl_config.accum_red_size = value;
  1458 			break;
  1459 		case SDL_GL_ACCUM_GREEN_SIZE:
  1460 			video->gl_config.accum_green_size = value;
  1461 			break;
  1462 		case SDL_GL_ACCUM_BLUE_SIZE:
  1463 			video->gl_config.accum_blue_size = value;
  1464 			break;
  1465 		case SDL_GL_ACCUM_ALPHA_SIZE:
  1466 			video->gl_config.accum_alpha_size = value;
  1467 			break;
  1468 		case SDL_GL_STEREO:
  1469 			video->gl_config.stereo = value;
  1470 			break;
  1471 		case SDL_GL_MULTISAMPLEBUFFERS:
  1472 			video->gl_config.multisamplebuffers = value;
  1473 			break;
  1474 		case SDL_GL_MULTISAMPLESAMPLES:
  1475 			video->gl_config.multisamplesamples = value;
  1476 			break;
  1477 		default:
  1478 			SDL_SetError("Unknown OpenGL attribute");
  1479 			retval = -1;
  1480 			break;
  1481 	}
  1482 	return(retval);
  1483 }
  1484 
  1485 /* Retrieve an attribute value from the windowing system. */
  1486 int SDL_GL_GetAttribute(SDL_GLattr attr, int* value)
  1487 {
  1488 	int retval = -1;
  1489 	SDL_VideoDevice* video = current_video;
  1490 	SDL_VideoDevice* this = current_video;
  1491 
  1492 	if ( video->GL_GetAttribute ) {
  1493 		retval = this->GL_GetAttribute(this, attr, value);
  1494 	} else {
  1495 		*value = 0;
  1496 		SDL_SetError("GL_GetAttribute not supported");
  1497 	}
  1498 	return retval;
  1499 }
  1500 
  1501 /* Perform a GL buffer swap on the current GL context */
  1502 void SDL_GL_SwapBuffers(void)
  1503 {
  1504 	SDL_VideoDevice *video = current_video;
  1505 	SDL_VideoDevice *this = current_video;
  1506 
  1507 	if ( video->screen->flags & SDL_OPENGL ) {
  1508 		video->GL_SwapBuffers(this);
  1509 	} else {
  1510 		SDL_SetError("OpenGL video mode has not been set");
  1511 	}
  1512 }
  1513 
  1514 /* Update rects with locking */
  1515 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect *rects)
  1516 {
  1517 	SDL_GL_Lock();
  1518  	SDL_GL_UpdateRects(numrects, rects);
  1519 	SDL_GL_Unlock();
  1520 }
  1521 
  1522 /* Update rects without state setting and changing (the caller is responsible for it) */
  1523 void SDL_GL_UpdateRects(int numrects, SDL_Rect *rects)
  1524 {
  1525 #ifdef HAVE_OPENGL
  1526 	SDL_VideoDevice *this = current_video;
  1527 	SDL_Rect update, tmp;
  1528 	int x, y, i;
  1529 
  1530 	for ( i = 0; i < numrects; i++ )
  1531 	{
  1532 		tmp.y = rects[i].y;
  1533 		tmp.h = rects[i].h;
  1534 		for ( y = 0; y <= rects[i].h / 256; y++ )
  1535 		{
  1536 			tmp.x = rects[i].x;
  1537 			tmp.w = rects[i].w;
  1538 			for ( x = 0; x <= rects[i].w / 256; x++ )
  1539 			{
  1540 				update.x = tmp.x;
  1541 				update.y = tmp.y;
  1542 				update.w = tmp.w;
  1543 				update.h = tmp.h;
  1544 
  1545 				if ( update.w > 256 )
  1546 					update.w = 256;
  1547 
  1548 				if ( update.h > 256 )
  1549 					update.h = 256;
  1550 			
  1551 				this->glFlush();
  1552 				this->glTexSubImage2D( 
  1553 					GL_TEXTURE_2D, 
  1554 					0, 
  1555 					0, 
  1556 					0, 
  1557 					update.w, 
  1558 					update.h, 
  1559 					this->is_32bit? GL_RGBA : GL_RGB,
  1560 #ifdef GL_VERSION_1_2
  1561 					this->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
  1562 #else
  1563 					GL_UNSIGNED_BYTE,
  1564 #endif
  1565 					(Uint8 *)this->screen->pixels + 
  1566 						this->screen->format->BytesPerPixel * update.x + 
  1567 						update.y * this->screen->pitch );
  1568 	
  1569 				this->glFlush();
  1570 				/*
  1571 				* Note the parens around the function name:
  1572 				* This is because some OpenGL implementations define glTexCoord etc 
  1573 				* as macros, and we don't want them expanded here.
  1574 				*/
  1575 				this->glBegin(GL_TRIANGLE_STRIP);
  1576 					(this->glTexCoord2f)( 0.0, 0.0 );	
  1577 					(this->glVertex2i)( update.x, update.y );
  1578 					(this->glTexCoord2f)( (float)(update.w / 256.0), 0.0 );	
  1579 					(this->glVertex2i)( update.x + update.w, update.y );
  1580 					(this->glTexCoord2f)( 0.0, (float)(update.h / 256.0) );
  1581 					(this->glVertex2i)( update.x, update.y + update.h );
  1582 					(this->glTexCoord2f)( (float)(update.w / 256.0), (float)(update.h / 256.0) );	
  1583 					(this->glVertex2i)( update.x + update.w	, update.y + update.h );
  1584 				this->glEnd();	
  1585 			
  1586 				tmp.x += 256;
  1587 				tmp.w -= 256;
  1588 			}
  1589 			tmp.y += 256;
  1590 			tmp.h -= 256;
  1591 		}
  1592 	}
  1593 #endif
  1594 }
  1595 
  1596 /* Lock == save current state */
  1597 void SDL_GL_Lock()
  1598 {
  1599 #ifdef HAVE_OPENGL
  1600 	lock_count--;
  1601 	if (lock_count==-1)
  1602 	{
  1603 		SDL_VideoDevice *this = current_video;
  1604 
  1605 		this->glPushAttrib( GL_ALL_ATTRIB_BITS );	/* TODO: narrow range of what is saved */
  1606 #ifdef GL_CLIENT_PIXEL_STORE_BIT
  1607 		this->glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
  1608 #endif
  1609 
  1610 		this->glEnable(GL_TEXTURE_2D);
  1611 		this->glEnable(GL_BLEND);
  1612 		this->glDisable(GL_FOG);
  1613 		this->glDisable(GL_ALPHA_TEST);
  1614 		this->glDisable(GL_DEPTH_TEST);
  1615 		this->glDisable(GL_SCISSOR_TEST);	
  1616 		this->glDisable(GL_STENCIL_TEST);
  1617 		this->glDisable(GL_CULL_FACE);
  1618 
  1619 		this->glBindTexture( GL_TEXTURE_2D, this->texture );
  1620 		this->glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
  1621 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
  1622 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
  1623 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
  1624 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
  1625 
  1626 		this->glPixelStorei( GL_UNPACK_ROW_LENGTH, this->screen->pitch / this->screen->format->BytesPerPixel );
  1627 		this->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  1628 		(this->glColor4f)(1.0, 1.0, 1.0, 1.0);		/* Solaris workaround */
  1629 
  1630 		this->glViewport(0, 0, this->screen->w, this->screen->h);
  1631 		this->glMatrixMode(GL_PROJECTION);
  1632 		this->glPushMatrix();
  1633 		this->glLoadIdentity();
  1634 
  1635 		this->glOrtho(0.0, (GLdouble) this->screen->w, (GLdouble) this->screen->h, 0.0, 0.0, 1.0);
  1636 
  1637 		this->glMatrixMode(GL_MODELVIEW);
  1638 		this->glPushMatrix();
  1639 		this->glLoadIdentity();
  1640 	}
  1641 #endif
  1642 }
  1643 
  1644 /* Unlock == restore saved state */
  1645 void SDL_GL_Unlock()
  1646 {
  1647 #ifdef HAVE_OPENGL
  1648 	lock_count++;
  1649 	if (lock_count==0)
  1650 	{
  1651 		SDL_VideoDevice *this = current_video;
  1652 
  1653 		this->glPopMatrix();
  1654 		this->glMatrixMode(GL_PROJECTION);
  1655 		this->glPopMatrix();
  1656 
  1657 		this->glPopClientAttrib();
  1658 		this->glPopAttrib();
  1659 	}
  1660 #endif
  1661 }
  1662 
  1663 /*
  1664  * Sets/Gets the title and icon text of the display window, if any.
  1665  */
  1666 void SDL_WM_SetCaption (const char *title, const char *icon)
  1667 {
  1668 	SDL_VideoDevice *video = current_video;
  1669 	SDL_VideoDevice *this  = current_video;
  1670 
  1671 	if ( video ) {
  1672 		if ( title ) {
  1673 			if ( video->wm_title ) {
  1674 				free(video->wm_title);
  1675 			}
  1676 			video->wm_title = (char *)malloc(strlen(title)+1);
  1677 			if ( video->wm_title != NULL ) {
  1678 				strcpy(video->wm_title, title);
  1679 			}
  1680 		}
  1681 		if ( icon ) {
  1682 			if ( video->wm_icon ) {
  1683 				free(video->wm_icon);
  1684 			}
  1685 			video->wm_icon = (char *)malloc(strlen(icon)+1);
  1686 			if ( video->wm_icon != NULL ) {
  1687 				strcpy(video->wm_icon, icon);
  1688 			}
  1689 		}
  1690 		if ( (title || icon) && (video->SetCaption != NULL) ) {
  1691 			video->SetCaption(this, video->wm_title,video->wm_icon);
  1692 		}
  1693 	}
  1694 }
  1695 void SDL_WM_GetCaption (char **title, char **icon)
  1696 {
  1697 	SDL_VideoDevice *video = current_video;
  1698 
  1699 	if ( video ) {
  1700 		if ( title ) {
  1701 			*title = video->wm_title;
  1702 		}
  1703 		if ( icon ) {
  1704 			*icon = video->wm_icon;
  1705 		}
  1706 	}
  1707 }
  1708 
  1709 /* Utility function used by SDL_WM_SetIcon();
  1710  * flags & 1 for color key, flags & 2 for alpha channel. */
  1711 static void CreateMaskFromColorKeyOrAlpha(SDL_Surface *icon, Uint8 *mask, int flags)
  1712 {
  1713 	int x, y;
  1714 	Uint32 colorkey;
  1715 #define SET_MASKBIT(icon, x, y, mask) \
  1716 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  1717 
  1718 	colorkey = icon->format->colorkey;
  1719 	switch (icon->format->BytesPerPixel) {
  1720 		case 1: { Uint8 *pixels;
  1721 			for ( y=0; y<icon->h; ++y ) {
  1722 				pixels = (Uint8 *)icon->pixels + y*icon->pitch;
  1723 				for ( x=0; x<icon->w; ++x ) {
  1724 					if ( *pixels++ == colorkey ) {
  1725 						SET_MASKBIT(icon, x, y, mask);
  1726 					}
  1727 				}
  1728 			}
  1729 		}
  1730 		break;
  1731 
  1732 		case 2: { Uint16 *pixels;
  1733 			for ( y=0; y<icon->h; ++y ) {
  1734 				pixels = (Uint16 *)icon->pixels +
  1735 				                   y*icon->pitch/2;
  1736 				for ( x=0; x<icon->w; ++x ) {
  1737 					if ( (flags & 1) && *pixels == colorkey ) {
  1738 						SET_MASKBIT(icon, x, y, mask);
  1739 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1740 						SET_MASKBIT(icon, x, y, mask);
  1741 					}
  1742 					pixels++;
  1743 				}
  1744 			}
  1745 		}
  1746 		break;
  1747 
  1748 		case 4: { Uint32 *pixels;
  1749 			for ( y=0; y<icon->h; ++y ) {
  1750 				pixels = (Uint32 *)icon->pixels +
  1751 				                   y*icon->pitch/4;
  1752 				for ( x=0; x<icon->w; ++x ) {
  1753 					if ( (flags & 1) && *pixels == colorkey ) {
  1754 						SET_MASKBIT(icon, x, y, mask);
  1755 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1756 						SET_MASKBIT(icon, x, y, mask);
  1757 					}
  1758 					pixels++;
  1759 				}
  1760 			}
  1761 		}
  1762 		break;
  1763 	}
  1764 }
  1765 
  1766 /*
  1767  * Sets the window manager icon for the display window.
  1768  */
  1769 void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
  1770 {
  1771 	SDL_VideoDevice *video = current_video;
  1772 	SDL_VideoDevice *this  = current_video;
  1773 
  1774 	if ( icon && video->SetIcon ) {
  1775 		/* Generate a mask if necessary, and create the icon! */
  1776 		if ( mask == NULL ) {
  1777 			int mask_len = icon->h*(icon->w+7)/8;
  1778 			int flags = 0;
  1779 			mask = (Uint8 *)malloc(mask_len);
  1780 			if ( mask == NULL ) {
  1781 				return;
  1782 			}
  1783 			memset(mask, ~0, mask_len);
  1784 			if ( icon->flags & SDL_SRCCOLORKEY ) flags |= 1;
  1785 			if ( icon->flags & SDL_SRCALPHA ) flags |= 2;
  1786 			if( flags ) {
  1787 				CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  1788 			}
  1789 			video->SetIcon(video, icon, mask);
  1790 			free(mask);
  1791 		} else {
  1792 			video->SetIcon(this, icon, mask);
  1793 		}
  1794 	}
  1795 }
  1796 
  1797 /*
  1798  * Grab or ungrab the keyboard and mouse input.
  1799  * This function returns the final grab mode after calling the
  1800  * driver dependent function.
  1801  */
  1802 static SDL_GrabMode SDL_WM_GrabInputRaw(SDL_GrabMode mode)
  1803 {
  1804 	SDL_VideoDevice *video = current_video;
  1805 	SDL_VideoDevice *this  = current_video;
  1806 
  1807 	/* Only do something if we have support for grabs */
  1808 	if ( video->GrabInput == NULL ) {
  1809 		return(video->input_grab);
  1810 	}
  1811 
  1812 	/* If the final grab mode if off, only then do we actually grab */
  1813 #ifdef DEBUG_GRAB
  1814   printf("SDL_WM_GrabInputRaw(%d) ... ", mode);
  1815 #endif
  1816 	if ( mode == SDL_GRAB_OFF ) {
  1817 		if ( video->input_grab != SDL_GRAB_OFF ) {
  1818 			mode = video->GrabInput(this, mode);
  1819 		}
  1820 	} else {
  1821 		if ( video->input_grab == SDL_GRAB_OFF ) {
  1822 			mode = video->GrabInput(this, mode);
  1823 		}
  1824 	}
  1825 	if ( mode != video->input_grab ) {
  1826 		video->input_grab = mode;
  1827 		if ( video->CheckMouseMode ) {
  1828 			video->CheckMouseMode(this);
  1829 		}
  1830 	}
  1831 #ifdef DEBUG_GRAB
  1832   printf("Final mode %d\n", video->input_grab);
  1833 #endif
  1834 
  1835 	/* Return the final grab state */
  1836 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1837 		mode -= SDL_GRAB_FULLSCREEN;
  1838 	}
  1839 	return(mode);
  1840 }
  1841 SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode)
  1842 {
  1843 	SDL_VideoDevice *video = current_video;
  1844 
  1845 	/* If the video isn't initialized yet, we can't do anything */
  1846 	if ( ! video ) {
  1847 		return SDL_GRAB_OFF;
  1848 	}
  1849 
  1850 	/* Return the current mode on query */
  1851 	if ( mode == SDL_GRAB_QUERY ) {
  1852 		mode = video->input_grab;
  1853 		if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1854 			mode -= SDL_GRAB_FULLSCREEN;
  1855 		}
  1856 		return(mode);
  1857 	}
  1858 
  1859 #ifdef DEBUG_GRAB
  1860   printf("SDL_WM_GrabInput(%d) ... ", mode);
  1861 #endif
  1862 	/* If the video surface is fullscreen, we always grab */
  1863 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1864 		mode -= SDL_GRAB_FULLSCREEN;
  1865 	}
  1866 	if ( SDL_VideoSurface && (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
  1867 		mode += SDL_GRAB_FULLSCREEN;
  1868 	}
  1869 	return(SDL_WM_GrabInputRaw(mode));
  1870 }
  1871 static SDL_GrabMode SDL_WM_GrabInputOff(void)
  1872 {
  1873 	SDL_GrabMode mode;
  1874 
  1875 	/* First query the current grab state */
  1876 	mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
  1877 
  1878 	/* Now explicitly turn off input grab */
  1879 	SDL_WM_GrabInputRaw(SDL_GRAB_OFF);
  1880 
  1881 	/* Return the old state */
  1882 	return(mode);
  1883 }
  1884 
  1885 /*
  1886  * Iconify the window in window managed environments.
  1887  * A successful iconification will result in an SDL_APPACTIVE loss event.
  1888  */
  1889 int SDL_WM_IconifyWindow(void)
  1890 {
  1891 	SDL_VideoDevice *video = current_video;
  1892 	SDL_VideoDevice *this  = current_video;
  1893 	int retval;
  1894 
  1895 	retval = 0;
  1896 	if ( video->IconifyWindow ) {
  1897 		retval = video->IconifyWindow(this);
  1898 	}
  1899 	return(retval);
  1900 }
  1901 
  1902 /*
  1903  * Toggle fullscreen mode
  1904  */
  1905 int SDL_WM_ToggleFullScreen(SDL_Surface *surface)
  1906 {
  1907 	SDL_VideoDevice *video = current_video;
  1908 	SDL_VideoDevice *this  = current_video;
  1909 	int toggled;
  1910 
  1911 	toggled = 0;
  1912 	if ( SDL_PublicSurface && (surface == SDL_PublicSurface) &&
  1913 	     video->ToggleFullScreen ) {
  1914 		if ( surface->flags & SDL_FULLSCREEN ) {
  1915 			toggled = video->ToggleFullScreen(this, 0);
  1916 			if ( toggled ) {
  1917 				SDL_VideoSurface->flags &= ~SDL_FULLSCREEN;
  1918 				SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
  1919 			}
  1920 		} else {
  1921 			toggled = video->ToggleFullScreen(this, 1);
  1922 			if ( toggled ) {
  1923 				SDL_VideoSurface->flags |= SDL_FULLSCREEN;
  1924 				SDL_PublicSurface->flags |= SDL_FULLSCREEN;
  1925 			}
  1926 		}
  1927 		/* Double-check the grab state inside SDL_WM_GrabInput() */
  1928 		if ( toggled ) {
  1929 			SDL_WM_GrabInput(video->input_grab);
  1930 		}
  1931 	}
  1932 	return(toggled);
  1933 }
  1934 
  1935 /*
  1936  * Get some platform dependent window manager information
  1937  */
  1938 int SDL_GetWMInfo (SDL_SysWMinfo *info)
  1939 {
  1940 	SDL_VideoDevice *video = current_video;
  1941 	SDL_VideoDevice *this  = current_video;
  1942 
  1943 	if ( video && video->GetWMInfo ) {
  1944 		return(video->GetWMInfo(this, info));
  1945 	} else {
  1946 		return(0);
  1947 	}
  1948 }