src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 20 May 2006 04:35:58 +0000
branchSDL-1.3
changeset 1660 8b9d79e7eacf
parent 1658 e49147870aac
child 1662 782fd950bd46
permissions -rw-r--r--
Added API requested in bug #43:

Added SDL_GetNumVideoDrivers() and SDL_GetVideoDriver().
Replaced SDL_VideoDriverName() with SDL_GetCurrentVideoDriver()
Added SDL_GetNumAudioDrivers() and SDL_GetAudioDriver().
Replaced SDL_AudioDriverName() with SDL_GetCurrentAudioDriver()
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2006 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 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     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* The high-level video driver subsystem */
    25 
    26 #include "SDL.h"
    27 #include "SDL_sysvideo.h"
    28 #include "SDL_blit.h"
    29 #include "SDL_pixels_c.h"
    30 #include "SDL_cursor_c.h"
    31 #include "../events/SDL_sysevents.h"
    32 #include "../events/SDL_events_c.h"
    33 
    34 /* Available video drivers */
    35 static VideoBootStrap *bootstrap[] = {
    36 #if SDL_VIDEO_DRIVER_QUARTZ
    37 	&QZ_bootstrap,
    38 #endif
    39 #if SDL_VIDEO_DRIVER_X11
    40 	&X11_bootstrap,
    41 #endif
    42 #if SDL_VIDEO_DRIVER_DGA
    43 	&DGA_bootstrap,
    44 #endif
    45 #if SDL_VIDEO_DRIVER_NANOX
    46 	&NX_bootstrap,
    47 #endif
    48 #if SDL_VIDEO_DRIVER_IPOD
    49 	&iPod_bootstrap,
    50 #endif
    51 #if SDL_VIDEO_DRIVER_QTOPIA
    52 	&Qtopia_bootstrap,
    53 #endif
    54 #if SDL_VIDEO_DRIVER_WSCONS
    55 	&WSCONS_bootstrap,
    56 #endif
    57 #if SDL_VIDEO_DRIVER_FBCON
    58 	&FBCON_bootstrap,
    59 #endif
    60 #if SDL_VIDEO_DRIVER_DIRECTFB
    61 	&DirectFB_bootstrap,
    62 #endif
    63 #if SDL_VIDEO_DRIVER_PS2GS
    64 	&PS2GS_bootstrap,
    65 #endif
    66 #if SDL_VIDEO_DRIVER_GGI
    67 	&GGI_bootstrap,
    68 #endif
    69 #if SDL_VIDEO_DRIVER_VGL
    70 	&VGL_bootstrap,
    71 #endif
    72 #if SDL_VIDEO_DRIVER_SVGALIB
    73 	&SVGALIB_bootstrap,
    74 #endif
    75 #if SDL_VIDEO_DRIVER_GAPI
    76 	&GAPI_bootstrap,
    77 #endif
    78 #if SDL_VIDEO_DRIVER_WINDIB
    79 	&WINDIB_bootstrap,
    80 #endif
    81 #if SDL_VIDEO_DRIVER_DDRAW
    82 	&DIRECTX_bootstrap,
    83 #endif
    84 #if SDL_VIDEO_DRIVER_BWINDOW
    85 	&BWINDOW_bootstrap,
    86 #endif
    87 #if SDL_VIDEO_DRIVER_TOOLBOX
    88 	&TOOLBOX_bootstrap,
    89 #endif
    90 #if SDL_VIDEO_DRIVER_DRAWSPROCKET
    91 	&DSp_bootstrap,
    92 #endif
    93 #if SDL_VIDEO_DRIVER_CYBERGRAPHICS
    94 	&CGX_bootstrap,
    95 #endif
    96 #if SDL_VIDEO_DRIVER_PHOTON
    97 	&ph_bootstrap,
    98 #endif
    99 #if SDL_VIDEO_DRIVER_EPOC
   100 	&EPOC_bootstrap,
   101 #endif
   102 #if SDL_VIDEO_DRIVER_XBIOS
   103 	&XBIOS_bootstrap,
   104 #endif
   105 #if SDL_VIDEO_DRIVER_GEM
   106 	&GEM_bootstrap,
   107 #endif
   108 #if SDL_VIDEO_DRIVER_PICOGUI
   109 	&PG_bootstrap,
   110 #endif
   111 #if SDL_VIDEO_DRIVER_DC
   112 	&DC_bootstrap,
   113 #endif
   114 #if SDL_VIDEO_DRIVER_RISCOS
   115 	&RISCOS_bootstrap,
   116 #endif
   117 #if SDL_VIDEO_DRIVER_OS2FS
   118 	&OS2FSLib_bootstrap,
   119 #endif
   120 #if SDL_VIDEO_DRIVER_AALIB
   121 	&AALIB_bootstrap,
   122 #endif
   123 #if SDL_VIDEO_DRIVER_DUMMY
   124 	&DUMMY_bootstrap,
   125 #endif
   126 #if SDL_VIDEO_DRIVER_GLSDL
   127 	&glSDL_bootstrap,
   128 #endif
   129 	NULL
   130 };
   131 
   132 SDL_VideoDevice *current_video = NULL;
   133 
   134 /* Various local functions */
   135 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   136 void SDL_VideoQuit(void);
   137 
   138 static SDL_GrabMode SDL_WM_GrabInputOff(void);
   139 
   140 int SDL_GetNumVideoDrivers(void)
   141 {
   142 	return(SDL_arraysize(bootstrap)-1);
   143 }
   144 
   145 const char *SDL_GetVideoDriver(int index)
   146 {
   147 	if ( index >= 0 && index < SDL_GetNumVideoDrivers() ) {
   148 		return(bootstrap[index]->name);
   149 	}
   150 	return(NULL);
   151 }
   152 
   153 /*
   154  * Initialize the video and event subsystems -- determine native pixel format
   155  */
   156 int SDL_VideoInit (const char *driver_name, Uint32 flags)
   157 {
   158 	SDL_VideoDevice *video;
   159 	int index;
   160 	int i;
   161 	SDL_PixelFormat vformat;
   162 	Uint32 video_flags;
   163 
   164 	/* Toggle the event thread flags, based on OS requirements */
   165 #if defined(MUST_THREAD_EVENTS)
   166 	flags |= SDL_INIT_EVENTTHREAD;
   167 #elif defined(CANT_THREAD_EVENTS)
   168 	if ( (flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {
   169 		SDL_SetError("OS doesn't support threaded events");
   170 		return(-1);
   171 	}
   172 #endif
   173 
   174 	/* Check to make sure we don't overwrite 'current_video' */
   175 	if ( current_video != NULL ) {
   176 		SDL_VideoQuit();
   177 	}
   178 
   179 	/* Select the proper video driver */
   180 	index = 0;
   181 	video = NULL;
   182 	if ( driver_name != NULL ) {
   183 #if 0	/* This will be replaced with a better driver selection API */
   184 		if ( SDL_strrchr(driver_name, ':') != NULL ) {
   185 			index = atoi(SDL_strrchr(driver_name, ':')+1);
   186 		}
   187 #endif
   188 		for ( i=0; bootstrap[i]; ++i ) {
   189 			if ( SDL_strncmp(bootstrap[i]->name, driver_name,
   190 			             SDL_strlen(bootstrap[i]->name)) == 0 ) {
   191 				if ( bootstrap[i]->available() ) {
   192 					video = bootstrap[i]->create(index);
   193 					break;
   194 				}
   195 			}
   196 		}
   197 	} else {
   198 		for ( i=0; bootstrap[i]; ++i ) {
   199 			if ( bootstrap[i]->available() ) {
   200 				video = bootstrap[i]->create(index);
   201 				if ( video != NULL ) {
   202 					break;
   203 				}
   204 			}
   205 		}
   206 	}
   207 	if ( video == NULL ) {
   208 		SDL_SetError("No available video device");
   209 		return(-1);
   210 	}
   211 	current_video = video;
   212 	current_video->name = bootstrap[i]->name;
   213 
   214 	/* Do some basic variable initialization */
   215 	video->screen = NULL;
   216 	video->shadow = NULL;
   217 	video->visible = NULL;
   218 	video->physpal = NULL;
   219 	video->gammacols = NULL;
   220 	video->gamma = NULL;
   221 	video->wm_title = NULL;
   222 	video->wm_icon  = NULL;
   223 	video->offset_x = 0;
   224 	video->offset_y = 0;
   225 	SDL_memset(&video->info, 0, (sizeof video->info));
   226 	
   227 	video->displayformatalphapixel = NULL;
   228 
   229 	/* Set some very sane GL defaults */
   230 	video->gl_config.driver_loaded = 0;
   231 	video->gl_config.dll_handle = NULL;
   232 	video->gl_config.red_size = 3;
   233 	video->gl_config.green_size = 3;
   234 	video->gl_config.blue_size = 2;
   235 	video->gl_config.alpha_size = 0;
   236 	video->gl_config.buffer_size = 0;
   237 	video->gl_config.depth_size = 16;
   238 	video->gl_config.stencil_size = 0;
   239 	video->gl_config.double_buffer = 1;
   240 	video->gl_config.accum_red_size = 0;
   241 	video->gl_config.accum_green_size = 0;
   242 	video->gl_config.accum_blue_size = 0;
   243 	video->gl_config.accum_alpha_size = 0;
   244 	video->gl_config.stereo = 0;
   245 	video->gl_config.multisamplebuffers = 0;
   246 	video->gl_config.multisamplesamples = 0;
   247 	video->gl_config.accelerated = -1; /* not known, don't set */
   248 	video->gl_config.swap_control = -1; /* not known, don't set */
   249 	
   250 	/* Initialize the video subsystem */
   251 	SDL_memset(&vformat, 0, sizeof(vformat));
   252 	if ( video->VideoInit(video, &vformat) < 0 ) {
   253 		SDL_VideoQuit();
   254 		return(-1);
   255 	}
   256 
   257 	/* Create a zero sized video surface of the appropriate format */
   258 	video_flags = SDL_SWSURFACE;
   259 	SDL_VideoSurface = SDL_CreateRGBSurface(video_flags, 0, 0,
   260 				vformat.BitsPerPixel,
   261 				vformat.Rmask, vformat.Gmask, vformat.Bmask, 0);
   262 	if ( SDL_VideoSurface == NULL ) {
   263 		SDL_VideoQuit();
   264 		return(-1);
   265 	}
   266 	SDL_PublicSurface = NULL;	/* Until SDL_SetVideoMode() */
   267 
   268 #if 0 /* Don't change the current palette - may be used by other programs.
   269        * The application can't do anything with the display surface until
   270        * a video mode has been set anyway. :)
   271        */
   272 	/* If we have a palettized surface, create a default palette */
   273 	if ( SDL_VideoSurface->format->palette ) {
   274 		SDL_PixelFormat *vf = SDL_VideoSurface->format;
   275 		SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   276 		video->SetColors(video,
   277 				 0, vf->palette->ncolors, vf->palette->colors);
   278 	}
   279 #endif
   280 	video->info.vfmt = SDL_VideoSurface->format;
   281 
   282 	/* Start the event loop */
   283 	if ( SDL_StartEventLoop(flags) < 0 ) {
   284 		SDL_VideoQuit();
   285 		return(-1);
   286 	}
   287 	SDL_CursorInit(flags & SDL_INIT_EVENTTHREAD);
   288 
   289 	/* We're ready to go! */
   290 	return(0);
   291 }
   292 
   293 const char *SDL_GetCurrentVideoDriver()
   294 {
   295 	if ( current_video ) {
   296 		return current_video->name;
   297 	}
   298 	return(NULL);
   299 }
   300 
   301 /*
   302  * Get the current display surface
   303  */
   304 SDL_Surface *SDL_GetVideoSurface(void)
   305 {
   306 	SDL_Surface *visible;
   307 
   308 	visible = NULL;
   309 	if ( current_video ) {
   310 		visible = current_video->visible;
   311 	}
   312 	return(visible);
   313 }
   314 
   315 /*
   316  * Get the current information about the video hardware
   317  */
   318 const SDL_VideoInfo *SDL_GetVideoInfo(void)
   319 {
   320 	const SDL_VideoInfo *info;
   321 
   322 	info = NULL;
   323 	if ( current_video ) {
   324 		info = &current_video->info;
   325 	}
   326 	return(info);
   327 }
   328 
   329 /*
   330  * Return a pointer to an array of available screen dimensions for the
   331  * given format, sorted largest to smallest.  Returns NULL if there are
   332  * no dimensions available for a particular format, or (SDL_Rect **)-1
   333  * if any dimension is okay for the given format.  If 'format' is NULL,
   334  * the mode list will be for the format given by SDL_GetVideoInfo()->vfmt
   335  */
   336 SDL_Rect ** SDL_ListModes (SDL_PixelFormat *format, Uint32 flags)
   337 {
   338 	SDL_VideoDevice *video = current_video;
   339 	SDL_VideoDevice *this  = current_video;
   340 	SDL_Rect **modes;
   341 
   342 	modes = NULL;
   343 	if ( SDL_VideoSurface ) {
   344 		if ( format == NULL ) {
   345 			format = SDL_VideoSurface->format;
   346 		}
   347 		modes = video->ListModes(this, format, flags);
   348 	}
   349 	return(modes);
   350 }
   351 
   352 /*
   353  * Check to see if a particular video mode is supported.
   354  * It returns 0 if the requested mode is not supported under any bit depth,
   355  * or returns the bits-per-pixel of the closest available mode with the
   356  * given width and height.  If this bits-per-pixel is different from the
   357  * one used when setting the video mode, SDL_SetVideoMode() will succeed,
   358  * but will emulate the requested bits-per-pixel with a shadow surface.
   359  */
   360 static Uint8 SDL_closest_depths[4][8] = {
   361 	/* 8 bit closest depth ordering */
   362 	{ 0, 8, 16, 15, 32, 24, 0, 0 },
   363 	/* 15,16 bit closest depth ordering */
   364 	{ 0, 16, 15, 32, 24, 8, 0, 0 },
   365 	/* 24 bit closest depth ordering */
   366 	{ 0, 24, 32, 16, 15, 8, 0, 0 },
   367 	/* 32 bit closest depth ordering */
   368 	{ 0, 32, 16, 15, 24, 8, 0, 0 }
   369 };
   370 
   371 
   372 #ifdef __MACOS__ /* MPW optimization bug? */
   373 #define NEGATIVE_ONE 0xFFFFFFFF
   374 #else
   375 #define NEGATIVE_ONE -1
   376 #endif
   377 
   378 int SDL_VideoModeOK (int width, int height, int bpp, Uint32 flags)
   379 {
   380 	int table, b, i;
   381 	int supported;
   382 	SDL_PixelFormat format;
   383 	SDL_Rect **sizes;
   384 
   385 	/* Currently 1 and 4 bpp are not supported */
   386 	if ( bpp < 8 || bpp > 32 ) {
   387 		return(0);
   388 	}
   389 	if ( (width <= 0) || (height <= 0) ) {
   390 		return(0);
   391 	}
   392 
   393 	/* Search through the list valid of modes */
   394 	SDL_memset(&format, 0, sizeof(format));
   395 	supported = 0;
   396 	table = ((bpp+7)/8)-1;
   397 	SDL_closest_depths[table][0] = bpp;
   398 	SDL_closest_depths[table][7] = 0;
   399 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   400 		format.BitsPerPixel = SDL_closest_depths[table][b];
   401 		sizes = SDL_ListModes(&format, flags);
   402 		if ( sizes == (SDL_Rect **)0 ) {
   403 			/* No sizes supported at this bit-depth */
   404 			continue;
   405 		} else 
   406 		if (sizes == (SDL_Rect **)NEGATIVE_ONE) {
   407 			/* Any size supported at this bit-depth */
   408 			supported = 1;
   409 			continue;
   410 		} else if (current_video->handles_any_size) {
   411 			/* Driver can center a smaller surface to simulate fullscreen */
   412 			for ( i=0; sizes[i]; ++i ) {
   413 				if ((sizes[i]->w >= width) && (sizes[i]->h >= height)) {
   414 					supported = 1; /* this mode can fit the centered window. */
   415 					break;
   416 				}
   417 			}
   418 		} else
   419 		for ( i=0; sizes[i]; ++i ) {
   420 			if ((sizes[i]->w == width) && (sizes[i]->h == height)) {
   421 				supported = 1;
   422 				break;
   423 			}
   424 		}
   425 	}
   426 	if ( supported ) {
   427 		--b;
   428 		return(SDL_closest_depths[table][b]);
   429 	} else {
   430 		return(0);
   431 	}
   432 }
   433 
   434 /*
   435  * Get the closest non-emulated video mode to the one requested
   436  */
   437 static int SDL_GetVideoMode (int *w, int *h, int *BitsPerPixel, Uint32 flags)
   438 {
   439 	int table, b, i;
   440 	int supported;
   441 	int native_bpp;
   442 	SDL_PixelFormat format;
   443 	SDL_Rect **sizes;
   444 
   445 	/* Check parameters */
   446 	if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {
   447 		SDL_SetError("Invalid bits per pixel (range is {8...32})");
   448 		return(0);
   449 	}
   450 	if ((*w <= 0) || (*h <= 0)) {
   451 		SDL_SetError("Invalid width or height");
   452 		return(0);
   453 	}
   454 
   455 	/* Try the original video mode, get the closest depth */
   456 	native_bpp = SDL_VideoModeOK(*w, *h, *BitsPerPixel, flags);
   457 	if ( native_bpp == *BitsPerPixel ) {
   458 		return(1);
   459 	}
   460 	if ( native_bpp > 0 ) {
   461 		*BitsPerPixel = native_bpp;
   462 		return(1);
   463 	}
   464 
   465 	/* No exact size match at any depth, look for closest match */
   466 	SDL_memset(&format, 0, sizeof(format));
   467 	supported = 0;
   468 	table = ((*BitsPerPixel+7)/8)-1;
   469 	SDL_closest_depths[table][0] = *BitsPerPixel;
   470 	SDL_closest_depths[table][7] = SDL_VideoSurface->format->BitsPerPixel;
   471 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   472 		int best;
   473 
   474 		format.BitsPerPixel = SDL_closest_depths[table][b];
   475 		sizes = SDL_ListModes(&format, flags);
   476 		if ( sizes == (SDL_Rect **)0 ) {
   477 			/* No sizes supported at this bit-depth */
   478 			continue;
   479 		}
   480 		best=0;
   481 		for ( i=0; sizes[i]; ++i ) {
   482 			/* Mode with both dimensions bigger or equal than asked ? */
   483 			if ((sizes[i]->w >= *w) && (sizes[i]->h >= *h)) {
   484 				/* Mode with any dimension smaller or equal than current best ? */
   485 				if ((sizes[i]->w <= sizes[best]->w) || (sizes[i]->h <= sizes[best]->h)) {
   486 					/* Now choose the mode that has less pixels */
   487 					if ((sizes[i]->w * sizes[i]->h) <= (sizes[best]->w * sizes[best]->h)) {
   488 						best=i;
   489 						supported = 1;
   490 					}
   491 				}
   492 			}
   493 		}
   494 		if (supported) {
   495 			*w=sizes[best]->w;
   496 			*h=sizes[best]->h;
   497 			*BitsPerPixel = SDL_closest_depths[table][b];
   498 		}
   499 	}
   500 	if ( ! supported ) {
   501 		SDL_SetError("No video mode large enough for %dx%d", *w, *h);
   502 	}
   503 	return(supported);
   504 }
   505 
   506 /* This should probably go somewhere else -- like SDL_surface.c */
   507 static void SDL_ClearSurface(SDL_Surface *surface)
   508 {
   509 	Uint32 black;
   510 
   511 	black = SDL_MapRGB(surface->format, 0, 0, 0);
   512 	SDL_FillRect(surface, NULL, black);
   513 	if ((surface->flags&SDL_HWSURFACE) && (surface->flags&SDL_DOUBLEBUF)) {
   514 		SDL_Flip(surface);
   515 		SDL_FillRect(surface, NULL, black);
   516 	}
   517 	SDL_Flip(surface);
   518 }
   519 
   520 /*
   521  * Create a shadow surface suitable for fooling the app. :-)
   522  */
   523 static void SDL_CreateShadowSurface(int depth)
   524 {
   525 	Uint32 Rmask, Gmask, Bmask;
   526 
   527 	/* Allocate the shadow surface */
   528 	if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   529 		Rmask = (SDL_VideoSurface->format)->Rmask;
   530 		Gmask = (SDL_VideoSurface->format)->Gmask;
   531 		Bmask = (SDL_VideoSurface->format)->Bmask;
   532 	} else {
   533 		Rmask = Gmask = Bmask = 0;
   534 	}
   535 	SDL_ShadowSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,
   536 				SDL_VideoSurface->w, SDL_VideoSurface->h,
   537 						depth, Rmask, Gmask, Bmask, 0);
   538 	if ( SDL_ShadowSurface == NULL ) {
   539 		return;
   540 	}
   541 
   542 	/* 8-bit shadow surfaces report that they have exclusive palette */
   543 	if ( SDL_ShadowSurface->format->palette ) {
   544 		SDL_ShadowSurface->flags |= SDL_HWPALETTE;
   545 		if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   546 			SDL_memcpy(SDL_ShadowSurface->format->palette->colors,
   547 				SDL_VideoSurface->format->palette->colors,
   548 				SDL_VideoSurface->format->palette->ncolors*
   549 							sizeof(SDL_Color));
   550 		} else {
   551 			SDL_DitherColors(
   552 			SDL_ShadowSurface->format->palette->colors, depth);
   553 		}
   554 	}
   555 
   556 	/* If the video surface is resizable, the shadow should say so */
   557 	if ( (SDL_VideoSurface->flags & SDL_RESIZABLE) == SDL_RESIZABLE ) {
   558 		SDL_ShadowSurface->flags |= SDL_RESIZABLE;
   559 	}
   560 	/* If the video surface has no frame, the shadow should say so */
   561 	if ( (SDL_VideoSurface->flags & SDL_NOFRAME) == SDL_NOFRAME ) {
   562 		SDL_ShadowSurface->flags |= SDL_NOFRAME;
   563 	}
   564 	/* If the video surface is fullscreen, the shadow should say so */
   565 	if ( (SDL_VideoSurface->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
   566 		SDL_ShadowSurface->flags |= SDL_FULLSCREEN;
   567 	}
   568 	/* If the video surface is flippable, the shadow should say so */
   569 	if ( (SDL_VideoSurface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   570 		SDL_ShadowSurface->flags |= SDL_DOUBLEBUF;
   571 	}
   572 	return;
   573 }
   574 
   575 #ifdef __QNXNTO__
   576     #include <sys/neutrino.h>
   577 #endif /* __QNXNTO__ */
   578 
   579 /*
   580  * Set the requested video mode, allocating a shadow buffer if necessary.
   581  */
   582 SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)
   583 {
   584 	SDL_VideoDevice *video, *this;
   585 	SDL_Surface *prev_mode, *mode;
   586 	int video_w;
   587 	int video_h;
   588 	int video_bpp;
   589 	int is_opengl;
   590 	SDL_GrabMode saved_grab;
   591 
   592 	/* Start up the video driver, if necessary..
   593 	   WARNING: This is the only function protected this way!
   594 	 */
   595 	if ( ! current_video ) {
   596 		if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) {
   597 			return(NULL);
   598 		}
   599 	}
   600 	this = video = current_video;
   601 
   602 	/* Default to the current width and height */
   603 	if ( width == 0 ) {
   604 		width = video->info.current_w;
   605 	}
   606 	if ( height == 0 ) {
   607 		height = video->info.current_h;
   608 	}
   609 	/* Default to the current video bpp */
   610 	if ( bpp == 0 ) {
   611 		flags |= SDL_ANYFORMAT;
   612 		bpp = SDL_VideoSurface->format->BitsPerPixel;
   613 	}
   614 
   615 	/* Get a good video mode, the closest one possible */
   616 	video_w = width;
   617 	video_h = height;
   618 	video_bpp = bpp;
   619 	if ( ! SDL_GetVideoMode(&video_w, &video_h, &video_bpp, flags) ) {
   620 		return(NULL);
   621 	}
   622 
   623 	/* Check the requested flags */
   624 	if ( flags & SDL_INTERNALOPENGL ) {
   625 		SDL_SetError("SDL_INTERNALOPENGL is for internal use only");
   626 		return(NULL);
   627 	}
   628 	if ( video_bpp > 8 ) {
   629 		/* There's no palette in > 8 bits-per-pixel mode */
   630 		flags &= ~SDL_HWPALETTE;
   631 	}
   632 #if 0
   633 	if ( (flags&SDL_FULLSCREEN) != SDL_FULLSCREEN ) {
   634 		/* There's no windowed double-buffering */
   635 		flags &= ~SDL_DOUBLEBUF;
   636 	}
   637 #endif
   638 	if ( (flags&SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   639 		/* Use hardware surfaces when double-buffering */
   640 		flags |= SDL_HWSURFACE;
   641 	}
   642 
   643 	is_opengl = ( ( flags & SDL_OPENGL ) == SDL_OPENGL );
   644 	if ( is_opengl ) {
   645 		/* These flags are for 2D video modes only */
   646 		flags &= ~(SDL_HWSURFACE|SDL_DOUBLEBUF);
   647 		/* This flag tells the backends to treat the surface accordingly */
   648 		flags |= SDL_INTERNALOPENGL;
   649 	}
   650 
   651 	/* Reset the keyboard here so event callbacks can run */
   652 	SDL_ResetKeyboard();
   653 	SDL_ResetMouse();
   654 	SDL_cursorstate &= ~CURSOR_USINGSW;
   655 
   656 	/* Clean up any previous video mode */
   657 	if ( SDL_PublicSurface != NULL ) {
   658 		SDL_PublicSurface = NULL;
   659 	}
   660 	if ( SDL_ShadowSurface != NULL ) {
   661 		SDL_Surface *ready_to_go;
   662 		ready_to_go = SDL_ShadowSurface;
   663 		SDL_ShadowSurface = NULL;
   664 		SDL_FreeSurface(ready_to_go);
   665 	}
   666 	if ( video->physpal ) {
   667 		SDL_free(video->physpal->colors);
   668 		SDL_free(video->physpal);
   669 		video->physpal = NULL;
   670 	}
   671 	if( video->gammacols) {
   672 		SDL_free(video->gammacols);
   673 		video->gammacols = NULL;
   674 	}
   675 
   676 	/* Save the previous grab state and turn off grab for mode switch */
   677 	saved_grab = SDL_WM_GrabInputOff();
   678 
   679 	/* Try to set the video mode, along with offset and clipping */
   680 	prev_mode = SDL_VideoSurface;
   681 	SDL_LockCursor();
   682 	SDL_VideoSurface = NULL;	/* In case it's freed by driver */
   683 	mode = video->SetVideoMode(this, prev_mode,video_w,video_h,video_bpp,flags);
   684 	if ( mode ) { /* Prevent resize events from mode change */
   685           /* But not on OS/2 */
   686 #ifndef __OS2__
   687 	    SDL_PrivateResize(mode->w, mode->h);
   688 #endif
   689 
   690 	    /* Sam - If we asked for OpenGL mode, and didn't get it, fail */
   691 	    if ( is_opengl && !(mode->flags & SDL_INTERNALOPENGL) ) {
   692 		mode = NULL;
   693 		SDL_SetError("OpenGL not available");
   694 	    }
   695 	}
   696 	/*
   697 	 * rcg11292000
   698 	 * If you try to set an SDL_OPENGL surface, and fail to find a
   699 	 * matching  visual, then the next call to SDL_SetVideoMode()
   700 	 * will segfault, since  we no longer point to a dummy surface,
   701 	 * but rather NULL.
   702 	 * Sam 11/29/00
   703 	 * WARNING, we need to make sure that the previous mode hasn't
   704 	 * already been freed by the video driver.  What do we do in
   705 	 * that case?  Should we call SDL_VideoInit() again?
   706 	 */
   707 	SDL_VideoSurface = (mode != NULL) ? mode : prev_mode;
   708 
   709 	if ( (mode != NULL) && (!is_opengl) ) {
   710 		/* Sanity check */
   711 		if ( (mode->w < width) || (mode->h < height) ) {
   712 			SDL_SetError("Video mode smaller than requested");
   713 			return(NULL);
   714 		}
   715 
   716 		/* If we have a palettized surface, create a default palette */
   717 		if ( mode->format->palette ) {
   718 			SDL_PixelFormat *vf = mode->format;
   719 			SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   720 			video->SetColors(this, 0, vf->palette->ncolors,
   721 			                           vf->palette->colors);
   722 		}
   723 
   724 		/* Clear the surface to black */
   725 		video->offset_x = 0;
   726 		video->offset_y = 0;
   727 		mode->offset = 0;
   728 		SDL_SetClipRect(mode, NULL);
   729 		SDL_ClearSurface(mode);
   730 
   731 		/* Now adjust the offsets to match the desired mode */
   732 		video->offset_x = (mode->w-width)/2;
   733 		video->offset_y = (mode->h-height)/2;
   734 		mode->offset = video->offset_y*mode->pitch +
   735 				video->offset_x*mode->format->BytesPerPixel;
   736 #ifdef DEBUG_VIDEO
   737   fprintf(stderr,
   738 	"Requested mode: %dx%dx%d, obtained mode %dx%dx%d (offset %d)\n",
   739 		width, height, bpp,
   740 		mode->w, mode->h, mode->format->BitsPerPixel, mode->offset);
   741 #endif
   742 		mode->w = width;
   743 		mode->h = height;
   744 		SDL_SetClipRect(mode, NULL);
   745 	}
   746 	SDL_ResetCursor();
   747 	SDL_UnlockCursor();
   748 
   749 	/* If we failed setting a video mode, return NULL... (Uh Oh!) */
   750 	if ( mode == NULL ) {
   751 		return(NULL);
   752 	}
   753 
   754 	/* If there is no window manager, set the SDL_NOFRAME flag */
   755 	if ( ! video->info.wm_available ) {
   756 		mode->flags |= SDL_NOFRAME;
   757 	}
   758 
   759 	/* Reset the mouse cursor and grab for new video mode */
   760 	SDL_SetCursor(NULL);
   761 	if ( video->UpdateMouse ) {
   762 		video->UpdateMouse(this);
   763 	}
   764 	SDL_WM_GrabInput(saved_grab);
   765 	SDL_GetRelativeMouseState(NULL, NULL); /* Clear first large delta */
   766 
   767 #if SDL_VIDEO_OPENGL
   768 	/* Load GL symbols (before MakeCurrent, where we need glGetString). */
   769 	if ( flags & SDL_INTERNALOPENGL ) {
   770 
   771 #if defined(__QNXNTO__) && (_NTO_VERSION < 630)
   772 #define __SDL_NOGETPROCADDR__
   773 #elif defined(__MINT__)
   774 #define __SDL_NOGETPROCADDR__
   775 #endif
   776 #ifdef __SDL_NOGETPROCADDR__
   777     #define SDL_PROC(ret,func,params) video->func=func;
   778 #else
   779     #define SDL_PROC(ret,func,params) \
   780     do { \
   781         video->func = SDL_GL_GetProcAddress(#func); \
   782         if ( ! video->func ) { \
   783             SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \
   784         return(NULL); \
   785         } \
   786     } while ( 0 );
   787 
   788 #endif /* __SDL_NOGETPROCADDR__ */
   789 
   790 #include "SDL_glfuncs.h"
   791 #undef SDL_PROC	
   792 	}
   793 #endif /* SDL_VIDEO_OPENGL */
   794 
   795 	/* If we're running OpenGL, make the context current */
   796 	if ( (video->screen->flags & SDL_INTERNALOPENGL) &&
   797 	      video->GL_MakeCurrent ) {
   798 		if ( video->GL_MakeCurrent(this) < 0 ) {
   799 			return(NULL);
   800 		}
   801 	}
   802 
   803 	/* Create a shadow surface if necessary */
   804 	/* There are three conditions under which we create a shadow surface:
   805 		1.  We need a particular bits-per-pixel that we didn't get.
   806 		2.  We need a hardware palette and didn't get one.
   807 		3.  We need a software surface and got a hardware surface.
   808 	*/
   809 	if ( !(SDL_VideoSurface->flags & SDL_OPENGL) &&
   810 	     (
   811 	     (  !(flags&SDL_ANYFORMAT) &&
   812 			(SDL_VideoSurface->format->BitsPerPixel != bpp)) ||
   813 	     (   (flags&SDL_HWPALETTE) && 
   814 				!(SDL_VideoSurface->flags&SDL_HWPALETTE)) ||
   815 		/* If the surface is in hardware, video writes are visible
   816 		   as soon as they are performed, so we need to buffer them
   817 		 */
   818 	     (   ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) &&
   819 				(SDL_VideoSurface->flags&SDL_HWSURFACE)) ||
   820 	     (   (flags&SDL_DOUBLEBUF) &&
   821 				(SDL_VideoSurface->flags&SDL_HWSURFACE) &&
   822 				!(SDL_VideoSurface->flags&SDL_DOUBLEBUF))
   823 	     ) ) {
   824 		SDL_CreateShadowSurface(bpp);
   825 		if ( SDL_ShadowSurface == NULL ) {
   826 			SDL_SetError("Couldn't create shadow surface");
   827 			return(NULL);
   828 		}
   829 		SDL_PublicSurface = SDL_ShadowSurface;
   830 	} else {
   831 		SDL_PublicSurface = SDL_VideoSurface;
   832 	}
   833 	video->info.vfmt = SDL_VideoSurface->format;
   834 	video->info.current_w = SDL_VideoSurface->w;
   835 	video->info.current_h = SDL_VideoSurface->h;
   836 
   837 	/* We're done! */
   838 	return(SDL_PublicSurface);
   839 }
   840 
   841 /* 
   842  * Convert a surface into the video pixel format.
   843  */
   844 SDL_Surface * SDL_DisplayFormat (SDL_Surface *surface)
   845 {
   846 	Uint32 flags;
   847 
   848 	if ( ! SDL_PublicSurface ) {
   849 		SDL_SetError("No video mode has been set");
   850 		return(NULL);
   851 	}
   852 	/* Set the flags appropriate for copying to display surface */
   853 	if (((SDL_PublicSurface->flags&SDL_HWSURFACE) == SDL_HWSURFACE) && current_video->info.blit_hw)
   854 		flags = SDL_HWSURFACE;
   855 	else 
   856 		flags = SDL_SWSURFACE;
   857 #ifdef AUTORLE_DISPLAYFORMAT
   858 	flags |= (surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA));
   859 	flags |= SDL_RLEACCELOK;
   860 #else
   861 	flags |= surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA|SDL_RLEACCELOK);
   862 #endif
   863 	return(SDL_ConvertSurface(surface, SDL_PublicSurface->format, flags));
   864 }
   865 
   866 /*
   867  * Convert a surface into a format that's suitable for blitting to
   868  * the screen, but including an alpha channel.
   869  */
   870 SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface)
   871 {
   872 	SDL_PixelFormat *vf;
   873 	SDL_PixelFormat *format;
   874 	SDL_Surface *converted;
   875 	Uint32 flags;
   876 	/* default to ARGB8888 */
   877 	Uint32 amask = 0xff000000;
   878 	Uint32 rmask = 0x00ff0000;
   879 	Uint32 gmask = 0x0000ff00;
   880 	Uint32 bmask = 0x000000ff;
   881 
   882 	if ( ! SDL_PublicSurface ) {
   883 		SDL_SetError("No video mode has been set");
   884 		return(NULL);
   885 	}
   886 	vf = SDL_PublicSurface->format;
   887 
   888 	switch(vf->BytesPerPixel) {
   889 	    case 2:
   890 		/* For XGY5[56]5, use, AXGY8888, where {X, Y} = {R, B}.
   891 		   For anything else (like ARGB4444) it doesn't matter
   892 		   since we have no special code for it anyway */
   893 		if ( (vf->Rmask == 0x1f) &&
   894 		     (vf->Bmask == 0xf800 || vf->Bmask == 0x7c00)) {
   895 			rmask = 0xff;
   896 			bmask = 0xff0000;
   897 		}
   898 		break;
   899 
   900 	    case 3:
   901 	    case 4:
   902 		/* Keep the video format, as long as the high 8 bits are
   903 		   unused or alpha */
   904 		if ( (vf->Rmask == 0xff) && (vf->Bmask == 0xff0000) ) {
   905 			rmask = 0xff;
   906 			bmask = 0xff0000;
   907 		}
   908 		break;
   909 
   910 	    default:
   911 		/* We have no other optimised formats right now. When/if a new
   912 		   optimised alpha format is written, add the converter here */
   913 		break;
   914 	}
   915 	format = SDL_AllocFormat(32, rmask, gmask, bmask, amask);
   916 	flags = SDL_PublicSurface->flags & SDL_HWSURFACE;
   917 	flags |= surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
   918 	converted = SDL_ConvertSurface(surface, format, flags);
   919 	SDL_FreeFormat(format);
   920 	return(converted);
   921 }
   922 
   923 /*
   924  * Update a specific portion of the physical screen
   925  */
   926 void SDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
   927 {
   928 	if ( screen ) {
   929 		SDL_Rect rect;
   930 
   931 		/* Perform some checking */
   932 		if ( w == 0 )
   933 			w = screen->w;
   934 		if ( h == 0 )
   935 			h = screen->h;
   936 		if ( (int)(x+w) > screen->w )
   937 			return;
   938 		if ( (int)(y+h) > screen->h )
   939 			return;
   940 
   941 		/* Fill the rectangle */
   942 		rect.x = (Sint16)x;
   943 		rect.y = (Sint16)y;
   944 		rect.w = (Uint16)w;
   945 		rect.h = (Uint16)h;
   946 		SDL_UpdateRects(screen, 1, &rect);
   947 	}
   948 }
   949 void SDL_UpdateRects (SDL_Surface *screen, int numrects, SDL_Rect *rects)
   950 {
   951 	int i;
   952 	SDL_VideoDevice *video = current_video;
   953 	SDL_VideoDevice *this = current_video;
   954 
   955 	if ( screen->flags & SDL_OPENGL ) {
   956 		SDL_SetError("OpenGL active, use SDL_GL_SwapBuffers()");
   957 		return;
   958 	}
   959 	if ( screen == SDL_ShadowSurface ) {
   960 		/* Blit the shadow surface using saved mapping */
   961 		SDL_Palette *pal = screen->format->palette;
   962 		SDL_Color *saved_colors = NULL;
   963 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
   964 			/* simulated 8bpp, use correct physical palette */
   965 			saved_colors = pal->colors;
   966 			if ( video->gammacols ) {
   967 				/* gamma-corrected palette */
   968 				pal->colors = video->gammacols;
   969 			} else if ( video->physpal ) {
   970 				/* physical palette different from logical */
   971 				pal->colors = video->physpal->colors;
   972 			}
   973 		}
   974 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
   975 			SDL_LockCursor();
   976 			SDL_DrawCursor(SDL_ShadowSurface);
   977 			for ( i=0; i<numrects; ++i ) {
   978 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
   979 						SDL_VideoSurface, &rects[i]);
   980 			}
   981 			SDL_EraseCursor(SDL_ShadowSurface);
   982 			SDL_UnlockCursor();
   983 		} else {
   984 			for ( i=0; i<numrects; ++i ) {
   985 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
   986 						SDL_VideoSurface, &rects[i]);
   987 			}
   988 		}
   989 		if ( saved_colors ) {
   990 			pal->colors = saved_colors;
   991 		}
   992 
   993 		/* Fall through to video surface update */
   994 		screen = SDL_VideoSurface;
   995 	}
   996 	if ( screen == SDL_VideoSurface ) {
   997 		/* Update the video surface */
   998 		if ( screen->offset ) {
   999 			for ( i=0; i<numrects; ++i ) {
  1000 				rects[i].x += video->offset_x;
  1001 				rects[i].y += video->offset_y;
  1002 			}
  1003 			video->UpdateRects(this, numrects, rects);
  1004 			for ( i=0; i<numrects; ++i ) {
  1005 				rects[i].x -= video->offset_x;
  1006 				rects[i].y -= video->offset_y;
  1007 			}
  1008 		} else {
  1009 			video->UpdateRects(this, numrects, rects);
  1010 		}
  1011 	}
  1012 }
  1013 
  1014 /*
  1015  * Performs hardware double buffering, if possible, or a full update if not.
  1016  */
  1017 int SDL_Flip(SDL_Surface *screen)
  1018 {
  1019 	SDL_VideoDevice *video = current_video;
  1020 	/* Copy the shadow surface to the video surface */
  1021 	if ( screen == SDL_ShadowSurface ) {
  1022 		SDL_Rect rect;
  1023 		SDL_Palette *pal = screen->format->palette;
  1024 		SDL_Color *saved_colors = NULL;
  1025 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1026 			/* simulated 8bpp, use correct physical palette */
  1027 			saved_colors = pal->colors;
  1028 			if ( video->gammacols ) {
  1029 				/* gamma-corrected palette */
  1030 				pal->colors = video->gammacols;
  1031 			} else if ( video->physpal ) {
  1032 				/* physical palette different from logical */
  1033 				pal->colors = video->physpal->colors;
  1034 			}
  1035 		}
  1036 
  1037 		rect.x = 0;
  1038 		rect.y = 0;
  1039 		rect.w = screen->w;
  1040 		rect.h = screen->h;
  1041 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1042 			SDL_LockCursor();
  1043 			SDL_DrawCursor(SDL_ShadowSurface);
  1044 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1045 					SDL_VideoSurface, &rect);
  1046 			SDL_EraseCursor(SDL_ShadowSurface);
  1047 			SDL_UnlockCursor();
  1048 		} else {
  1049 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1050 					SDL_VideoSurface, &rect);
  1051 		}
  1052 		if ( saved_colors ) {
  1053 			pal->colors = saved_colors;
  1054 		}
  1055 
  1056 		/* Fall through to video surface update */
  1057 		screen = SDL_VideoSurface;
  1058 	}
  1059 	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
  1060 		SDL_VideoDevice *this  = current_video;
  1061 		return(video->FlipHWSurface(this, SDL_VideoSurface));
  1062 	} else {
  1063 		SDL_UpdateRect(screen, 0, 0, 0, 0);
  1064 	}
  1065 	return(0);
  1066 }
  1067 
  1068 static void SetPalette_logical(SDL_Surface *screen, SDL_Color *colors,
  1069 			       int firstcolor, int ncolors)
  1070 {
  1071 	SDL_Palette *pal = screen->format->palette;
  1072 	SDL_Palette *vidpal;
  1073 
  1074 	if ( colors != (pal->colors + firstcolor) ) {
  1075 		SDL_memcpy(pal->colors + firstcolor, colors,
  1076 		       ncolors * sizeof(*colors));
  1077 	}
  1078 
  1079 	vidpal = SDL_VideoSurface->format->palette;
  1080 	if ( (screen == SDL_ShadowSurface) && vidpal ) {
  1081 		/*
  1082 		 * This is a shadow surface, and the physical
  1083 		 * framebuffer is also indexed. Propagate the
  1084 		 * changes to its logical palette so that
  1085 		 * updates are always identity blits
  1086 		 */
  1087 		SDL_memcpy(vidpal->colors + firstcolor, colors,
  1088 		       ncolors * sizeof(*colors));
  1089 	}
  1090 	SDL_FormatChanged(screen);
  1091 }
  1092 
  1093 static int SetPalette_physical(SDL_Surface *screen,
  1094                                SDL_Color *colors, int firstcolor, int ncolors)
  1095 {
  1096 	SDL_VideoDevice *video = current_video;
  1097 	int gotall = 1;
  1098 
  1099 	if ( video->physpal ) {
  1100 		/* We need to copy the new colors, since we haven't
  1101 		 * already done the copy in the logical set above.
  1102 		 */
  1103 		SDL_memcpy(video->physpal->colors + firstcolor,
  1104 		       colors, ncolors * sizeof(*colors));
  1105 	}
  1106 	if ( screen == SDL_ShadowSurface ) {
  1107 		if ( SDL_VideoSurface->flags & SDL_HWPALETTE ) {
  1108 			/*
  1109 			 * The real screen is also indexed - set its physical
  1110 			 * palette. The physical palette does not include the
  1111 			 * gamma modification, we apply it directly instead,
  1112 			 * but this only happens if we have hardware palette.
  1113 			 */
  1114 			screen = SDL_VideoSurface;
  1115 		} else {
  1116 			/*
  1117 			 * The video surface is not indexed - invalidate any
  1118 			 * active shadow-to-video blit mappings.
  1119 			 */
  1120 			if ( screen->map->dst == SDL_VideoSurface ) {
  1121 				SDL_InvalidateMap(screen->map);
  1122 			}
  1123 			if ( video->gamma ) {
  1124 				if( ! video->gammacols ) {
  1125 					SDL_Palette *pp = video->physpal;
  1126 					if(!pp)
  1127 						pp = screen->format->palette;
  1128 					video->gammacols = SDL_malloc(pp->ncolors
  1129 							  * sizeof(SDL_Color));
  1130 					SDL_ApplyGamma(video->gamma,
  1131 						       pp->colors,
  1132 						       video->gammacols,
  1133 						       pp->ncolors);
  1134 				} else {
  1135 					SDL_ApplyGamma(video->gamma, colors,
  1136 						       video->gammacols
  1137 						       + firstcolor,
  1138 						       ncolors);
  1139 				}
  1140 			}
  1141 			SDL_UpdateRect(screen, 0, 0, 0, 0);
  1142 		}
  1143 	}
  1144 
  1145 	if ( screen == SDL_VideoSurface ) {
  1146 		SDL_Color gcolors[256];
  1147 
  1148 		if ( video->gamma ) {
  1149 			SDL_ApplyGamma(video->gamma, colors, gcolors, ncolors);
  1150 			colors = gcolors;
  1151 		}
  1152 		gotall = video->SetColors(video, firstcolor, ncolors, colors);
  1153 		if ( ! gotall ) {
  1154 			/* The video flags shouldn't have SDL_HWPALETTE, and
  1155 			   the video driver is responsible for copying back the
  1156 			   correct colors into the video surface palette.
  1157 			*/
  1158 			;
  1159 		}
  1160 		SDL_CursorPaletteChanged();
  1161 	}
  1162 	return gotall;
  1163 }
  1164 
  1165 /*
  1166  * Set the physical and/or logical colormap of a surface:
  1167  * Only the screen has a physical colormap. It determines what is actually
  1168  * sent to the display.
  1169  * The logical colormap is used to map blits to/from the surface.
  1170  * 'which' is one or both of SDL_LOGPAL, SDL_PHYSPAL
  1171  *
  1172  * Return nonzero if all colours were set as requested, or 0 otherwise.
  1173  */
  1174 int SDL_SetPalette(SDL_Surface *screen, int which,
  1175 		   SDL_Color *colors, int firstcolor, int ncolors)
  1176 {
  1177 	SDL_Palette *pal;
  1178 	int gotall;
  1179 	int palsize;
  1180 
  1181 	if ( ! current_video ) {
  1182 		return 0;
  1183 	}
  1184 	if ( screen != SDL_PublicSurface ) {
  1185 		/* only screens have physical palettes */
  1186 		which &= ~SDL_PHYSPAL;
  1187 	} else if( (screen->flags & SDL_HWPALETTE) != SDL_HWPALETTE ) {
  1188 		/* hardware palettes required for split colormaps */
  1189 		which |= SDL_PHYSPAL | SDL_LOGPAL;
  1190 	}
  1191 
  1192 	/* Verify the parameters */
  1193 	pal = screen->format->palette;
  1194 	if( !pal ) {
  1195 		return 0;	/* not a palettized surface */
  1196 	}
  1197 	gotall = 1;
  1198 	palsize = 1 << screen->format->BitsPerPixel;
  1199 	if ( ncolors > (palsize - firstcolor) ) {
  1200 		ncolors = (palsize - firstcolor);
  1201 		gotall = 0;
  1202 	}
  1203 
  1204 	if ( which & SDL_LOGPAL ) {
  1205 		/*
  1206 		 * Logical palette change: The actual screen isn't affected,
  1207 		 * but the internal colormap is altered so that the
  1208 		 * interpretation of the pixel values (for blits etc) is
  1209 		 * changed.
  1210 		 */
  1211 		SetPalette_logical(screen, colors, firstcolor, ncolors);
  1212 	}
  1213 	if ( which & SDL_PHYSPAL ) {
  1214 		SDL_VideoDevice *video = current_video;
  1215 		/*
  1216 		 * Physical palette change: This doesn't affect the
  1217 		 * program's idea of what the screen looks like, but changes
  1218 		 * its actual appearance.
  1219 		 */
  1220 		if(!video)
  1221 			return gotall;	/* video not yet initialized */
  1222 		if(!video->physpal && !(which & SDL_LOGPAL) ) {
  1223 			/* Lazy physical palette allocation */
  1224 			int size;
  1225 			SDL_Palette *pp = SDL_malloc(sizeof(*pp));
  1226 			if ( !pp ) {
  1227 				return 0;
  1228 			}
  1229 			current_video->physpal = pp;
  1230 			pp->ncolors = pal->ncolors;
  1231 			size = pp->ncolors * sizeof(SDL_Color);
  1232 			pp->colors = SDL_malloc(size);
  1233 			if ( !pp->colors ) {
  1234 				return 0;
  1235 			}
  1236 			SDL_memcpy(pp->colors, pal->colors, size);
  1237 		}
  1238 		if ( ! SetPalette_physical(screen,
  1239 		                           colors, firstcolor, ncolors) ) {
  1240 			gotall = 0;
  1241 		}
  1242 	}
  1243 	return gotall;
  1244 }
  1245 
  1246 int SDL_SetColors(SDL_Surface *screen, SDL_Color *colors, int firstcolor,
  1247 		  int ncolors)
  1248 {
  1249 	return SDL_SetPalette(screen, SDL_LOGPAL | SDL_PHYSPAL,
  1250 			      colors, firstcolor, ncolors);
  1251 }
  1252 
  1253 /*
  1254  * Clean up the video subsystem
  1255  */
  1256 void SDL_VideoQuit (void)
  1257 {
  1258 	SDL_Surface *ready_to_go;
  1259 
  1260 	if ( current_video ) {
  1261 		SDL_VideoDevice *video = current_video;
  1262 		SDL_VideoDevice *this  = current_video;
  1263 
  1264 		/* Halt event processing before doing anything else */
  1265 		SDL_StopEventLoop();
  1266 
  1267 		/* Clean up allocated window manager items */
  1268 		if ( SDL_PublicSurface ) {
  1269 			SDL_PublicSurface = NULL;
  1270 		}
  1271 		SDL_CursorQuit();
  1272 
  1273 		/* Just in case... */
  1274 		SDL_WM_GrabInputOff();
  1275 
  1276 		/* Clean up the system video */
  1277 		video->VideoQuit(this);
  1278 
  1279 		/* Free any lingering surfaces */
  1280 		ready_to_go = SDL_ShadowSurface;
  1281 		SDL_ShadowSurface = NULL;
  1282 		SDL_FreeSurface(ready_to_go);
  1283 		if ( SDL_VideoSurface != NULL ) {
  1284 			ready_to_go = SDL_VideoSurface;
  1285 			SDL_VideoSurface = NULL;
  1286 			SDL_FreeSurface(ready_to_go);
  1287 		}
  1288 		SDL_PublicSurface = NULL;
  1289 
  1290 		/* Clean up miscellaneous memory */
  1291 		if ( video->physpal ) {
  1292 			SDL_free(video->physpal->colors);
  1293 			SDL_free(video->physpal);
  1294 			video->physpal = NULL;
  1295 		}
  1296 		if ( video->gammacols ) {
  1297 			SDL_free(video->gammacols);
  1298 			video->gammacols = NULL;
  1299 		}
  1300 		if ( video->gamma ) {
  1301 			SDL_free(video->gamma);
  1302 			video->gamma = NULL;
  1303 		}
  1304 		if ( video->wm_title != NULL ) {
  1305 			SDL_free(video->wm_title);
  1306 			video->wm_title = NULL;
  1307 		}
  1308 		if ( video->wm_icon != NULL ) {
  1309 			SDL_free(video->wm_icon);
  1310 			video->wm_icon = NULL;
  1311 		}
  1312 
  1313 		/* Finish cleaning up video subsystem */
  1314 		video->free(this);
  1315 		current_video = NULL;
  1316 	}
  1317 	return;
  1318 }
  1319 
  1320 /* Load the GL driver library */
  1321 int SDL_GL_LoadLibrary(const char *path)
  1322 {
  1323 	SDL_VideoDevice *video = current_video;
  1324 	SDL_VideoDevice *this = current_video;
  1325 	int retval;
  1326 
  1327 	retval = -1;
  1328 	if ( video == NULL ) {
  1329 		SDL_SetError("Video subsystem has not been initialized");
  1330 	} else {
  1331 		if ( video->GL_LoadLibrary ) {
  1332 			retval = video->GL_LoadLibrary(this, path);
  1333 		} else {
  1334 			SDL_SetError("No dynamic GL support in video driver");
  1335 		}
  1336 	}
  1337 	return(retval);
  1338 }
  1339 
  1340 void *SDL_GL_GetProcAddress(const char* proc)
  1341 {
  1342 	SDL_VideoDevice *video = current_video;
  1343 	SDL_VideoDevice *this = current_video;
  1344 	void *func;
  1345 
  1346 	func = NULL;
  1347 	if ( video->GL_GetProcAddress ) {
  1348 		if ( video->gl_config.driver_loaded ) {
  1349 			func = video->GL_GetProcAddress(this, proc);
  1350 		} else {
  1351 			SDL_SetError("No GL driver has been loaded");
  1352 		}
  1353 	} else {
  1354 		SDL_SetError("No dynamic GL support in video driver");
  1355 	}
  1356 	return func;
  1357 }
  1358 
  1359 /* Set the specified GL attribute for setting up a GL video mode */
  1360 int SDL_GL_SetAttribute( SDL_GLattr attr, int value )
  1361 {
  1362 	int retval;
  1363 	SDL_VideoDevice *video = current_video;
  1364 
  1365 	retval = 0;
  1366 	switch (attr) {
  1367 		case SDL_GL_RED_SIZE:
  1368 			video->gl_config.red_size = value;
  1369 			break;
  1370 		case SDL_GL_GREEN_SIZE:
  1371 			video->gl_config.green_size = value;
  1372 			break;
  1373 		case SDL_GL_BLUE_SIZE:
  1374 			video->gl_config.blue_size = value;
  1375 			break;
  1376 		case SDL_GL_ALPHA_SIZE:
  1377 			video->gl_config.alpha_size = value;
  1378 			break;
  1379 		case SDL_GL_DOUBLEBUFFER:
  1380 			video->gl_config.double_buffer = value;
  1381 			break;
  1382 		case SDL_GL_BUFFER_SIZE:
  1383 			video->gl_config.buffer_size = value;
  1384 			break;
  1385 		case SDL_GL_DEPTH_SIZE:
  1386 			video->gl_config.depth_size = value;
  1387 			break;
  1388 		case SDL_GL_STENCIL_SIZE:
  1389 			video->gl_config.stencil_size = value;
  1390 			break;
  1391 		case SDL_GL_ACCUM_RED_SIZE:
  1392 			video->gl_config.accum_red_size = value;
  1393 			break;
  1394 		case SDL_GL_ACCUM_GREEN_SIZE:
  1395 			video->gl_config.accum_green_size = value;
  1396 			break;
  1397 		case SDL_GL_ACCUM_BLUE_SIZE:
  1398 			video->gl_config.accum_blue_size = value;
  1399 			break;
  1400 		case SDL_GL_ACCUM_ALPHA_SIZE:
  1401 			video->gl_config.accum_alpha_size = value;
  1402 			break;
  1403 		case SDL_GL_STEREO:
  1404 			video->gl_config.stereo = value;
  1405 			break;
  1406 		case SDL_GL_MULTISAMPLEBUFFERS:
  1407 			video->gl_config.multisamplebuffers = value;
  1408 			break;
  1409 		case SDL_GL_MULTISAMPLESAMPLES:
  1410 			video->gl_config.multisamplesamples = value;
  1411 			break;
  1412 		case SDL_GL_ACCELERATED_VISUAL:
  1413 			video->gl_config.accelerated = value;
  1414 			break;
  1415 		case SDL_GL_SWAP_CONTROL:
  1416 			video->gl_config.swap_control = value;
  1417 			break;
  1418 		default:
  1419 			SDL_SetError("Unknown OpenGL attribute");
  1420 			retval = -1;
  1421 			break;
  1422 	}
  1423 	return(retval);
  1424 }
  1425 
  1426 /* Retrieve an attribute value from the windowing system. */
  1427 int SDL_GL_GetAttribute(SDL_GLattr attr, int* value)
  1428 {
  1429 	int retval = -1;
  1430 	SDL_VideoDevice* video = current_video;
  1431 	SDL_VideoDevice* this = current_video;
  1432 
  1433 	if ( video->GL_GetAttribute ) {
  1434 		retval = this->GL_GetAttribute(this, attr, value);
  1435 	} else {
  1436 		*value = 0;
  1437 		SDL_SetError("GL_GetAttribute not supported");
  1438 	}
  1439 	return retval;
  1440 }
  1441 
  1442 /* Perform a GL buffer swap on the current GL context */
  1443 void SDL_GL_SwapBuffers(void)
  1444 {
  1445 	SDL_VideoDevice *video = current_video;
  1446 	SDL_VideoDevice *this = current_video;
  1447 
  1448 	if ( video->screen->flags & SDL_INTERNALOPENGL ) {
  1449 		video->GL_SwapBuffers(this);
  1450 	} else {
  1451 		SDL_SetError("OpenGL video mode has not been set");
  1452 	}
  1453 }
  1454 
  1455 /*
  1456  * Sets/Gets the title and icon text of the display window, if any.
  1457  */
  1458 void SDL_WM_SetCaption (const char *title, const char *icon)
  1459 {
  1460 	SDL_VideoDevice *video = current_video;
  1461 	SDL_VideoDevice *this  = current_video;
  1462 
  1463 	if ( video ) {
  1464 		if ( title ) {
  1465 			if ( video->wm_title ) {
  1466 				SDL_free(video->wm_title);
  1467 			}
  1468 			video->wm_title = SDL_strdup(title);
  1469 		}
  1470 		if ( icon ) {
  1471 			if ( video->wm_icon ) {
  1472 				SDL_free(video->wm_icon);
  1473 			}
  1474 			video->wm_icon = SDL_strdup(icon);
  1475 		}
  1476 		if ( (title || icon) && (video->SetCaption != NULL) ) {
  1477 			video->SetCaption(this, video->wm_title,video->wm_icon);
  1478 		}
  1479 	}
  1480 }
  1481 void SDL_WM_GetCaption (char **title, char **icon)
  1482 {
  1483 	SDL_VideoDevice *video = current_video;
  1484 
  1485 	if ( video ) {
  1486 		if ( title ) {
  1487 			*title = video->wm_title;
  1488 		}
  1489 		if ( icon ) {
  1490 			*icon = video->wm_icon;
  1491 		}
  1492 	}
  1493 }
  1494 
  1495 /* Utility function used by SDL_WM_SetIcon();
  1496  * flags & 1 for color key, flags & 2 for alpha channel. */
  1497 static void CreateMaskFromColorKeyOrAlpha(SDL_Surface *icon, Uint8 *mask, int flags)
  1498 {
  1499 	int x, y;
  1500 	Uint32 colorkey;
  1501 #define SET_MASKBIT(icon, x, y, mask) \
  1502 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  1503 
  1504 	colorkey = icon->format->colorkey;
  1505 	switch (icon->format->BytesPerPixel) {
  1506 		case 1: { Uint8 *pixels;
  1507 			for ( y=0; y<icon->h; ++y ) {
  1508 				pixels = (Uint8 *)icon->pixels + y*icon->pitch;
  1509 				for ( x=0; x<icon->w; ++x ) {
  1510 					if ( *pixels++ == colorkey ) {
  1511 						SET_MASKBIT(icon, x, y, mask);
  1512 					}
  1513 				}
  1514 			}
  1515 		}
  1516 		break;
  1517 
  1518 		case 2: { Uint16 *pixels;
  1519 			for ( y=0; y<icon->h; ++y ) {
  1520 				pixels = (Uint16 *)icon->pixels +
  1521 				                   y*icon->pitch/2;
  1522 				for ( x=0; x<icon->w; ++x ) {
  1523 					if ( (flags & 1) && *pixels == colorkey ) {
  1524 						SET_MASKBIT(icon, x, y, mask);
  1525 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1526 						SET_MASKBIT(icon, x, y, mask);
  1527 					}
  1528 					pixels++;
  1529 				}
  1530 			}
  1531 		}
  1532 		break;
  1533 
  1534 		case 4: { Uint32 *pixels;
  1535 			for ( y=0; y<icon->h; ++y ) {
  1536 				pixels = (Uint32 *)icon->pixels +
  1537 				                   y*icon->pitch/4;
  1538 				for ( x=0; x<icon->w; ++x ) {
  1539 					if ( (flags & 1) && *pixels == colorkey ) {
  1540 						SET_MASKBIT(icon, x, y, mask);
  1541 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1542 						SET_MASKBIT(icon, x, y, mask);
  1543 					}
  1544 					pixels++;
  1545 				}
  1546 			}
  1547 		}
  1548 		break;
  1549 	}
  1550 }
  1551 
  1552 /*
  1553  * Sets the window manager icon for the display window.
  1554  */
  1555 void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
  1556 {
  1557 	SDL_VideoDevice *video = current_video;
  1558 	SDL_VideoDevice *this  = current_video;
  1559 
  1560 	if ( icon && video->SetIcon ) {
  1561 		/* Generate a mask if necessary, and create the icon! */
  1562 		if ( mask == NULL ) {
  1563 			int mask_len = icon->h*(icon->w+7)/8;
  1564 			int flags = 0;
  1565 			mask = (Uint8 *)SDL_malloc(mask_len);
  1566 			if ( mask == NULL ) {
  1567 				return;
  1568 			}
  1569 			SDL_memset(mask, ~0, mask_len);
  1570 			if ( icon->flags & SDL_SRCCOLORKEY ) flags |= 1;
  1571 			if ( icon->flags & SDL_SRCALPHA ) flags |= 2;
  1572 			if( flags ) {
  1573 				CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  1574 			}
  1575 			video->SetIcon(video, icon, mask);
  1576 			SDL_free(mask);
  1577 		} else {
  1578 			video->SetIcon(this, icon, mask);
  1579 		}
  1580 	}
  1581 }
  1582 
  1583 /*
  1584  * Grab or ungrab the keyboard and mouse input.
  1585  * This function returns the final grab mode after calling the
  1586  * driver dependent function.
  1587  */
  1588 static SDL_GrabMode SDL_WM_GrabInputRaw(SDL_GrabMode mode)
  1589 {
  1590 	SDL_VideoDevice *video = current_video;
  1591 	SDL_VideoDevice *this  = current_video;
  1592 
  1593 	/* Only do something if we have support for grabs */
  1594 	if ( video->GrabInput == NULL ) {
  1595 		return(video->input_grab);
  1596 	}
  1597 
  1598 	/* If the final grab mode if off, only then do we actually grab */
  1599 #ifdef DEBUG_GRAB
  1600   printf("SDL_WM_GrabInputRaw(%d) ... ", mode);
  1601 #endif
  1602 	if ( mode == SDL_GRAB_OFF ) {
  1603 		if ( video->input_grab != SDL_GRAB_OFF ) {
  1604 			mode = video->GrabInput(this, mode);
  1605 		}
  1606 	} else {
  1607 		if ( video->input_grab == SDL_GRAB_OFF ) {
  1608 			mode = video->GrabInput(this, mode);
  1609 		}
  1610 	}
  1611 	if ( mode != video->input_grab ) {
  1612 		video->input_grab = mode;
  1613 		if ( video->CheckMouseMode ) {
  1614 			video->CheckMouseMode(this);
  1615 		}
  1616 	}
  1617 #ifdef DEBUG_GRAB
  1618   printf("Final mode %d\n", video->input_grab);
  1619 #endif
  1620 
  1621 	/* Return the final grab state */
  1622 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1623 		mode -= SDL_GRAB_FULLSCREEN;
  1624 	}
  1625 	return(mode);
  1626 }
  1627 SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode)
  1628 {
  1629 	SDL_VideoDevice *video = current_video;
  1630 
  1631 	/* If the video isn't initialized yet, we can't do anything */
  1632 	if ( ! video ) {
  1633 		return SDL_GRAB_OFF;
  1634 	}
  1635 
  1636 	/* Return the current mode on query */
  1637 	if ( mode == SDL_GRAB_QUERY ) {
  1638 		mode = video->input_grab;
  1639 		if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1640 			mode -= SDL_GRAB_FULLSCREEN;
  1641 		}
  1642 		return(mode);
  1643 	}
  1644 
  1645 #ifdef DEBUG_GRAB
  1646   printf("SDL_WM_GrabInput(%d) ... ", mode);
  1647 #endif
  1648 	/* If the video surface is fullscreen, we always grab */
  1649 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1650 		mode -= SDL_GRAB_FULLSCREEN;
  1651 	}
  1652 	if ( SDL_VideoSurface && (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
  1653 		mode += SDL_GRAB_FULLSCREEN;
  1654 	}
  1655 	return(SDL_WM_GrabInputRaw(mode));
  1656 }
  1657 static SDL_GrabMode SDL_WM_GrabInputOff(void)
  1658 {
  1659 	SDL_GrabMode mode;
  1660 
  1661 	/* First query the current grab state */
  1662 	mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
  1663 
  1664 	/* Now explicitly turn off input grab */
  1665 	SDL_WM_GrabInputRaw(SDL_GRAB_OFF);
  1666 
  1667 	/* Return the old state */
  1668 	return(mode);
  1669 }
  1670 
  1671 /*
  1672  * Iconify the window in window managed environments.
  1673  * A successful iconification will result in an SDL_APPACTIVE loss event.
  1674  */
  1675 int SDL_WM_IconifyWindow(void)
  1676 {
  1677 	SDL_VideoDevice *video = current_video;
  1678 	SDL_VideoDevice *this  = current_video;
  1679 	int retval;
  1680 
  1681 	retval = 0;
  1682 	if ( video->IconifyWindow ) {
  1683 		retval = video->IconifyWindow(this);
  1684 	}
  1685 	return(retval);
  1686 }
  1687 
  1688 /*
  1689  * Toggle fullscreen mode
  1690  */
  1691 int SDL_WM_ToggleFullScreen(SDL_Surface *surface)
  1692 {
  1693 	SDL_VideoDevice *video = current_video;
  1694 	SDL_VideoDevice *this  = current_video;
  1695 	int toggled;
  1696 
  1697 	toggled = 0;
  1698 	if ( SDL_PublicSurface && (surface == SDL_PublicSurface) &&
  1699 	     video->ToggleFullScreen ) {
  1700 		if ( surface->flags & SDL_FULLSCREEN ) {
  1701 			toggled = video->ToggleFullScreen(this, 0);
  1702 			if ( toggled ) {
  1703 				SDL_VideoSurface->flags &= ~SDL_FULLSCREEN;
  1704 				SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
  1705 			}
  1706 		} else {
  1707 			toggled = video->ToggleFullScreen(this, 1);
  1708 			if ( toggled ) {
  1709 				SDL_VideoSurface->flags |= SDL_FULLSCREEN;
  1710 				SDL_PublicSurface->flags |= SDL_FULLSCREEN;
  1711 			}
  1712 		}
  1713 		/* Double-check the grab state inside SDL_WM_GrabInput() */
  1714 		if ( toggled ) {
  1715 			SDL_WM_GrabInput(video->input_grab);
  1716 		}
  1717 	}
  1718 	return(toggled);
  1719 }
  1720 
  1721 /*
  1722  * Get some platform dependent window manager information
  1723  */
  1724 int SDL_GetWMInfo (SDL_SysWMinfo *info)
  1725 {
  1726 	SDL_VideoDevice *video = current_video;
  1727 	SDL_VideoDevice *this  = current_video;
  1728 
  1729 	if ( video && video->GetWMInfo ) {
  1730 		return(video->GetWMInfo(this, info));
  1731 	} else {
  1732 		return(0);
  1733 	}
  1734 }