src/video/SDL_video.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 22 Nov 2005 15:19:50 +0000
changeset 1187 19d8949b4584
parent 1141 fe1fa56dcbc6
child 1190 173c063d4f55
permissions -rw-r--r--
To: sdl@libsdl.org
From: Staffan Ulfberg <staffan@ulfberg.se>
Date: 19 Nov 2005 01:00:48 +0100
Subject: [SDL] New driver for OpenBSD/wscons

Hello,

I've written an SDL driver for OpenBSD/wscons (console mode, somewhat
resembling the functionality of the svga driver for Linux). I use it
for playing MAME on my Sharp Zaurus. The alternative is to play under
X, which is slower.

I asked how to submit the driver a few days ago, and posted a link to
the patch in a follow-up, so maybe it was missed?

Anyway, the patch is on the web at:

http://multivac.fatburen.org/SDL-wscons.patch

Comments?

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