src/video/SDL_video.c
author Holmes Futrell <hfutrell@umail.ucsb.edu>
Tue, 02 Sep 2008 20:19:45 +0000
changeset 2745 587d2b5fb805
parent 2744 1aede15771d0
child 2753 0969758c8809
permissions -rw-r--r--
Added support for OpenGL ES renderer
     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_renderer_gl.h"
    31 #include "SDL_renderer_gles.h"
    32 #include "SDL_renderer_sw.h"
    33 #include "../events/SDL_sysevents.h"
    34 #include "../events/SDL_events_c.h"
    35 
    36 #if SDL_VIDEO_OPENGL_ES
    37 #include "SDL_opengles.h"
    38 #endif				/* SDL_VIDEO_OPENGL_ES */
    39 
    40 #if SDL_VIDEO_OPENGL
    41 #include "SDL_opengl.h"
    42 
    43 /* On Windows, windows.h defines CreateWindow */
    44 #ifdef CreateWindow
    45 #undef CreateWindow
    46 #endif
    47 #endif				/* SDL_VIDEO_OPENGL */
    48 
    49 /* Available video drivers */
    50 static VideoBootStrap *bootstrap[] = {
    51 #if SDL_VIDEO_DRIVER_COCOA
    52 	&COCOA_bootstrap,
    53 #endif
    54 #if SDL_VIDEO_DRIVER_X11
    55 	&X11_bootstrap,
    56 #endif
    57 #if SDL_VIDEO_DRIVER_NANOX
    58 	&NX_bootstrap,
    59 #endif
    60 #if SDL_VIDEO_DRIVER_IPOD
    61 	&iPod_bootstrap,
    62 #endif
    63 #if SDL_VIDEO_DRIVER_WSCONS
    64 	&WSCONS_bootstrap,
    65 #endif
    66 #if SDL_VIDEO_DRIVER_FBCON
    67 	&FBCON_bootstrap,
    68 #endif
    69 #if SDL_VIDEO_DRIVER_DIRECTFB
    70 	&DirectFB_bootstrap,
    71 #endif
    72 #if SDL_VIDEO_DRIVER_PS2GS
    73 	&PS2GS_bootstrap,
    74 #endif
    75 #if SDL_VIDEO_DRIVER_VGL
    76 	&VGL_bootstrap,
    77 #endif
    78 #if SDL_VIDEO_DRIVER_SVGALIB
    79 	&SVGALIB_bootstrap,
    80 #endif
    81 #if SDL_VIDEO_DRIVER_GAPI
    82 	&GAPI_bootstrap,
    83 #endif
    84 #if SDL_VIDEO_DRIVER_WIN32
    85 	&WIN32_bootstrap,
    86 #endif
    87 #if SDL_VIDEO_DRIVER_BWINDOW
    88 	&BWINDOW_bootstrap,
    89 #endif
    90 #if SDL_VIDEO_DRIVER_PHOTON
    91 	&ph_bootstrap,
    92 #endif
    93 #if SDL_VIDEO_DRIVER_EPOC
    94 	&EPOC_bootstrap,
    95 #endif
    96 #if SDL_VIDEO_DRIVER_XBIOS
    97 	&XBIOS_bootstrap,
    98 #endif
    99 #if SDL_VIDEO_DRIVER_GEM
   100 	&GEM_bootstrap,
   101 #endif
   102 #if SDL_VIDEO_DRIVER_DC
   103 	&DC_bootstrap,
   104 #endif
   105 #if SDL_VIDEO_DRIVER_RISCOS
   106 	&RISCOS_bootstrap,
   107 #endif
   108 #if SDL_VIDEO_DRIVER_OS2FS
   109 	&OS2FSLib_bootstrap,
   110 #endif
   111 #if SDL_VIDEO_DRIVER_NDS
   112 	&NDS_bootstrap,
   113 #endif
   114 #if SDL_VIDEO_DRIVER_UIKIT
   115 	&UIKIT_bootstrap,
   116 #endif
   117 #if SDL_VIDEO_DRIVER_DUMMY
   118 	&DUMMY_bootstrap,
   119 #endif
   120 	NULL
   121 };
   122 
   123 static SDL_VideoDevice *_this = NULL;
   124 
   125 /* Various local functions */
   126 int             SDL_VideoInit(const char *driver_name, Uint32 flags);
   127 void            SDL_VideoQuit(void);
   128 
   129 static int
   130 cmpmodes(const void *A, const void *B)
   131 {
   132 	SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   133 	SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   134 
   135 	if (a.w != b.w) {
   136 		return b.w - a.w;
   137 	}
   138 	if (a.h != b.h) {
   139 		return b.h - a.h;
   140 	}
   141 	if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   142 		return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   143 	}
   144 	if (a.refresh_rate != b.refresh_rate) {
   145 		return b.refresh_rate - a.refresh_rate;
   146 	}
   147 	return 0;
   148 }
   149 
   150 static void
   151 SDL_UninitializedVideo()
   152 {
   153 	SDL_SetError("Video subsystem has not been initialized");
   154 }
   155 
   156 int
   157 SDL_GetNumVideoDrivers(void)
   158 {
   159 	return SDL_arraysize(bootstrap) - 1;
   160 }
   161 
   162 const char     *
   163 SDL_GetVideoDriver(int index)
   164 {
   165 	if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   166 		return bootstrap[index]->name;
   167 	}
   168 	return NULL;
   169 }
   170 
   171 /*
   172  * Initialize the video and event subsystems -- determine native pixel format
   173  */
   174 int
   175 SDL_VideoInit(const char *driver_name, Uint32 flags)
   176 {
   177 	SDL_VideoDevice *video;
   178 	int             index;
   179 	int             i;
   180 
   181 	/* Toggle the event thread flags, based on OS requirements */
   182 #if defined(MUST_THREAD_EVENTS)
   183 	flags |= SDL_INIT_EVENTTHREAD;
   184 #elif defined(CANT_THREAD_EVENTS)
   185 	if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   186 		SDL_SetError("OS doesn't support threaded events");
   187 		return -1;
   188 	}
   189 #endif
   190 
   191 	/* Start the event loop */
   192 	if (SDL_StartEventLoop(flags) < 0) {
   193 		return -1;
   194 	}
   195 	/* Check to make sure we don't overwrite '_this' */
   196 	if (_this != NULL) {
   197 		SDL_VideoQuit();
   198 	}
   199 	/* Select the proper video driver */
   200 	index = 0;
   201 	video = NULL;
   202 	if (driver_name == NULL) {
   203 		driver_name = SDL_getenv("SDL_VIDEODRIVER");
   204 	}
   205 	if (driver_name != NULL) {
   206 		for (i = 0; bootstrap[i]; ++i) {
   207 			if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   208 				if (bootstrap[i]->available()) {
   209 					video = bootstrap[i]->create(index);
   210 				}
   211 				break;
   212 			}
   213 		}
   214 	} else {
   215 		for (i = 0; bootstrap[i]; ++i) {
   216 			if (bootstrap[i]->available()) {
   217 				video = bootstrap[i]->create(index);
   218 				if (video != NULL) {
   219 					break;
   220 				}
   221 			}
   222 		}
   223 	}
   224 	if (video == NULL) {
   225 		if (driver_name) {
   226 			SDL_SetError("%s not available", driver_name);
   227 		} else {
   228 			SDL_SetError("No available video device");
   229 		}
   230 		return -1;
   231 	}
   232 	_this = video;
   233 	_this->name = bootstrap[i]->name;
   234 	_this->next_object_id = 1;
   235 
   236 
   237 	/* Set some very sane GL defaults */
   238 	_this->gl_config.driver_loaded = 0;
   239 	_this->gl_config.dll_handle = NULL;
   240 	_this->gl_config.red_size = 3;
   241 	_this->gl_config.green_size = 3;
   242 	_this->gl_config.blue_size = 2;
   243 	_this->gl_config.alpha_size = 0;
   244 	_this->gl_config.buffer_size = 0;
   245 	_this->gl_config.depth_size = 16;
   246 	_this->gl_config.stencil_size = 0;
   247 	_this->gl_config.double_buffer = 1;
   248 	_this->gl_config.accum_red_size = 0;
   249 	_this->gl_config.accum_green_size = 0;
   250 	_this->gl_config.accum_blue_size = 0;
   251 	_this->gl_config.accum_alpha_size = 0;
   252 	_this->gl_config.stereo = 0;
   253 	_this->gl_config.multisamplebuffers = 0;
   254 	_this->gl_config.multisamplesamples = 0;
   255 	_this->gl_config.retained_backing = 1;
   256 	_this->gl_config.accelerated = -1;	/* not known, don't set */
   257 
   258 	/* Initialize the video subsystem */
   259 	if (_this->VideoInit(_this) < 0) {
   260 		SDL_VideoQuit();
   261 		return -1;
   262 	}
   263 	/* Make sure some displays were added */
   264 	if (_this->num_displays == 0) {
   265 		SDL_SetError("The video driver did not add any displays");
   266 		SDL_VideoQuit();
   267 		return (-1);
   268 	}
   269 	/* The software renderer is always available */
   270 	for (i = 0; i < _this->num_displays; ++i) {
   271 #if SDL_VIDEO_RENDER_OGL
   272 		SDL_AddRenderDriver(i, &GL_RenderDriver);
   273 #endif
   274 
   275 #if SDL_VIDEO_RENDER_OGL_ES
   276 		SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
   277 #endif
   278 		if (_this->displays[i].num_render_drivers > 0) {
   279 			SDL_AddRenderDriver(i, &SW_RenderDriver);
   280 		}
   281 	}
   282 
   283 	/* We're ready to go! */
   284 	return 0;
   285 }
   286 
   287 const char     *
   288 SDL_GetCurrentVideoDriver()
   289 {
   290 	if (!_this) {
   291 		SDL_UninitializedVideo();
   292 		return NULL;
   293 	}
   294 	return _this->name;
   295 }
   296 
   297 SDL_VideoDevice *
   298 SDL_GetVideoDevice()
   299 {
   300 	return _this;
   301 }
   302 
   303 int
   304 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   305 {
   306 	SDL_VideoDisplay display;
   307 
   308 	SDL_zero(display);
   309 	if (desktop_mode) {
   310 		display.desktop_mode = *desktop_mode;
   311 	}
   312 	display.current_mode = display.desktop_mode;
   313 
   314 	return SDL_AddVideoDisplay(&display);
   315 }
   316 
   317 int
   318 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   319 {
   320 	SDL_VideoDisplay *displays;
   321 	int             index = -1;
   322 
   323 	displays =
   324 		SDL_realloc(_this->displays,
   325 			    (_this->num_displays + 1) * sizeof(*displays));
   326 	if (displays) {
   327 		index = _this->num_displays++;
   328 		displays[index] = *display;
   329 		displays[index].device = _this;
   330 		_this->displays = displays;
   331 	} else {
   332 		SDL_OutOfMemory();
   333 	}
   334 	return index;
   335 }
   336 
   337 int
   338 SDL_GetNumVideoDisplays(void)
   339 {
   340 	if (!_this) {
   341 		SDL_UninitializedVideo();
   342 		return 0;
   343 	}
   344 	return _this->num_displays;
   345 }
   346 
   347 int
   348 SDL_SelectVideoDisplay(int index)
   349 {
   350 	if (!_this) {
   351 		SDL_UninitializedVideo();
   352 		return (-1);
   353 	}
   354 	if (index < 0 || index >= _this->num_displays) {
   355 		SDL_SetError("index must be in the range 0 - %d",
   356 			     _this->num_displays - 1);
   357 		return -1;
   358 	}
   359 	_this->current_display = index;
   360 	return 0;
   361 }
   362 
   363 int
   364 SDL_GetCurrentVideoDisplay(void)
   365 {
   366 	if (!_this) {
   367 		SDL_UninitializedVideo();
   368 		return (-1);
   369 	}
   370 	return _this->current_display;
   371 }
   372 
   373 SDL_bool
   374 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   375 {
   376 	SDL_VideoDisplay *display = &_this->displays[displayIndex];
   377 	SDL_DisplayMode *modes;
   378 	int             i, nmodes;
   379 
   380 	/* Make sure we don't already have the mode in the list */
   381 	modes = display->display_modes;
   382 	nmodes = display->num_display_modes;
   383 	for (i = nmodes; i--;) {
   384 		if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   385 			return SDL_FALSE;
   386 		}
   387 	}
   388 
   389 	/* Go ahead and add the new mode */
   390 	if (nmodes == display->max_display_modes) {
   391 		modes =
   392 			SDL_realloc(modes,
   393 			(display->max_display_modes + 32) * sizeof(*modes));
   394 		if (!modes) {
   395 			return SDL_FALSE;
   396 		}
   397 		display->display_modes = modes;
   398 		display->max_display_modes += 32;
   399 	}
   400 	modes[nmodes] = *mode;
   401 	display->num_display_modes++;
   402 
   403 	return SDL_TRUE;
   404 }
   405 
   406 int
   407 SDL_GetNumDisplayModes()
   408 {
   409 	if (_this) {
   410 		SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   411 		if (!display->num_display_modes && _this->GetDisplayModes) {
   412 			_this->GetDisplayModes(_this);
   413 			SDL_qsort(display->display_modes, display->num_display_modes,
   414 				  sizeof(SDL_DisplayMode), cmpmodes);
   415 		}
   416 		return display->num_display_modes;
   417 	}
   418 	return 0;
   419 }
   420 
   421 int
   422 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   423 {
   424 	if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   425 		SDL_SetError("index must be in the range of 0 - %d",
   426 			     SDL_GetNumDisplayModes() - 1);
   427 		return -1;
   428 	}
   429 	if (mode) {
   430 		*mode = SDL_CurrentDisplay.display_modes[index];
   431 	}
   432 	return 0;
   433 }
   434 
   435 int
   436 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   437 {
   438 	if (!_this) {
   439 		SDL_UninitializedVideo();
   440 		return -1;
   441 	}
   442 	if (mode) {
   443 		*mode = SDL_CurrentDisplay.desktop_mode;
   444 	}
   445 	return 0;
   446 }
   447 
   448 int
   449 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   450 {
   451 	if (!_this) {
   452 		SDL_UninitializedVideo();
   453 		return -1;
   454 	}
   455 	if (mode) {
   456 		*mode = SDL_CurrentDisplay.current_mode;
   457 	}
   458 	return 0;
   459 }
   460 
   461 SDL_DisplayMode *
   462 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   463 			  SDL_DisplayMode * closest)
   464 {
   465 	Uint32          target_format;
   466 	int             target_refresh_rate;
   467 	int             i;
   468 	SDL_DisplayMode *current, *match;
   469 
   470 	if (!_this || !mode || !closest) {
   471 		return NULL;
   472 	}
   473 	/* Default to the desktop format */
   474 	if (mode->format) {
   475 		target_format = mode->format;
   476 	} else {
   477 		target_format = SDL_CurrentDisplay.desktop_mode.format;
   478 	}
   479 
   480 	/* Default to the desktop refresh rate */
   481 	if (mode->refresh_rate) {
   482 		target_refresh_rate = mode->refresh_rate;
   483 	} else {
   484 		target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   485 	}
   486 
   487 	match = NULL;
   488 	for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   489 		current = &SDL_CurrentDisplay.display_modes[i];
   490 
   491 		if ((current->w && current->h) &&
   492 		    (current->w < mode->w || current->h < mode->h)) {
   493 			/* Out of sorted modes large enough here */
   494 			break;
   495 		}
   496 		if (!match || current->w < match->w || current->h < match->h) {
   497 			match = current;
   498 			continue;
   499 		}
   500 		if (current->format != match->format) {
   501 			/* Sorted highest depth to lowest */
   502 			if (current->format == target_format ||
   503 			    (SDL_BITSPERPIXEL(current->format) >=
   504 			     SDL_BITSPERPIXEL(target_format)
   505 			     && SDL_PIXELTYPE(current->format) ==
   506 			     SDL_PIXELTYPE(target_format))) {
   507 				match = current;
   508 			}
   509 			continue;
   510 		}
   511 		if (current->refresh_rate != match->refresh_rate) {
   512 			/* Sorted highest refresh to lowest */
   513 			if (current->refresh_rate >= target_refresh_rate) {
   514 				match = current;
   515 			}
   516 		}
   517 	}
   518 	if (match) {
   519 		if (match->format) {
   520 			closest->format = match->format;
   521 		} else {
   522 			closest->format = mode->format;
   523 		}
   524 		if (match->w && match->h) {
   525 			closest->w = match->w;
   526 			closest->h = match->h;
   527 		} else {
   528 			closest->w = mode->w;
   529 			closest->h = mode->h;
   530 		}
   531 		if (match->refresh_rate) {
   532 			closest->refresh_rate = match->refresh_rate;
   533 		} else {
   534 			closest->refresh_rate = mode->refresh_rate;
   535 		}
   536 		closest->driverdata = match->driverdata;
   537 
   538 		/*
   539 		 * Pick some reasonable defaults if the app and driver don't
   540 		 * care
   541 		 */
   542 		if (!closest->format) {
   543 			closest->format = SDL_PIXELFORMAT_RGB888;
   544 		}
   545 		if (!closest->w) {
   546 			closest->w = 640;
   547 		}
   548 		if (!closest->h) {
   549 			closest->h = 480;
   550 		}
   551 		return closest;
   552 	}
   553 	return NULL;
   554 }
   555 
   556 int
   557 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   558 {
   559 	SDL_VideoDisplay *display;
   560 	SDL_DisplayMode display_mode;
   561 	SDL_DisplayMode current_mode;
   562 	int             i, ncolors;
   563 
   564 	if (!_this) {
   565 		SDL_UninitializedVideo();
   566 		return -1;
   567 	}
   568 	display = &SDL_CurrentDisplay;
   569 	if (!mode) {
   570 		mode = &display->desktop_mode;
   571 	}
   572 	display_mode = *mode;
   573 
   574 	/* Default to the current mode */
   575 	if (!display_mode.format) {
   576 		display_mode.format = display->current_mode.format;
   577 	}
   578 	if (!display_mode.w) {
   579 		display_mode.w = display->current_mode.w;
   580 	}
   581 	if (!display_mode.h) {
   582 		display_mode.h = display->current_mode.h;
   583 	}
   584 	if (!display_mode.refresh_rate) {
   585 		display_mode.refresh_rate = display->current_mode.refresh_rate;
   586 	}
   587 	/* Get a good video mode, the closest one possible */
   588 	if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   589 		SDL_SetError("No video mode large enough for %dx%d",
   590 			     display_mode.w, display_mode.h);
   591 		return -1;
   592 	}
   593 	/* See if there's anything left to do */
   594 	SDL_GetCurrentDisplayMode(&current_mode);
   595 	if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   596 		return 0;
   597 	}
   598 	/* Actually change the display mode */
   599 	if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   600 		return -1;
   601 	}
   602 	display->current_mode = display_mode;
   603 
   604 	/* Set up a palette, if necessary */
   605 	if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   606 		ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   607 	} else {
   608 		ncolors = 0;
   609 	}
   610 	if ((!ncolors && display->palette) || (ncolors && !display->palette)
   611 	    || (ncolors && ncolors != display->palette->ncolors)) {
   612 		if (display->palette) {
   613 			SDL_FreePalette(display->palette);
   614 			display->palette = NULL;
   615 		}
   616 		if (ncolors) {
   617 			display->palette = SDL_AllocPalette(ncolors);
   618 			if (!display->palette) {
   619 				return -1;
   620 			}
   621 			SDL_DitherColors(display->palette->colors,
   622 				     SDL_BITSPERPIXEL(display_mode.format));
   623 		}
   624 	}
   625 	/* Move any fullscreen windows into position */
   626 	for (i = 0; i < display->num_windows; ++i) {
   627 		SDL_Window     *window = &display->windows[i];
   628 		if (FULLSCREEN_VISIBLE(window)) {
   629 			SDL_SetWindowPosition(window->id, SDL_WINDOWPOS_CENTERED,
   630 					      SDL_WINDOWPOS_CENTERED);
   631 		}
   632 	}
   633 
   634 	return 0;
   635 }
   636 
   637 int
   638 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   639 {
   640 	SDL_VideoDisplay *display;
   641 	SDL_DisplayMode fullscreen_mode;
   642 	int             i;
   643 
   644 	if (!_this) {
   645 		SDL_UninitializedVideo();
   646 		return -1;
   647 	}
   648 	display = &SDL_CurrentDisplay;
   649 	if (!mode) {
   650 		mode = &display->desktop_mode;
   651 	}
   652 	SDL_GetClosestDisplayMode(mode, &fullscreen_mode);
   653 	if (SDL_memcmp
   654 	    (&fullscreen_mode, &display->fullscreen_mode,
   655 	     sizeof(fullscreen_mode)) == 0) {
   656 		/* Nothing to do... */
   657 		return 0;
   658 	}
   659 	display->fullscreen_mode = fullscreen_mode;
   660 
   661 	/* Actually set the mode if we have a fullscreen window visible */
   662 	for (i = 0; i < display->num_windows; ++i) {
   663 		SDL_Window     *window = &display->windows[i];
   664 		if (FULLSCREEN_VISIBLE(window)) {
   665 			if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   666 				return -1;
   667 			}
   668 		}
   669 		if (window->flags & SDL_WINDOW_FULLSCREEN) {
   670 			SDL_OnWindowResized(window);
   671 		}
   672 	}
   673 	return 0;
   674 }
   675 
   676 int
   677 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   678 {
   679 	if (!_this) {
   680 		SDL_UninitializedVideo();
   681 		return -1;
   682 	}
   683 	if (mode) {
   684 		*mode = SDL_CurrentDisplay.fullscreen_mode;
   685 	}
   686 	return 0;
   687 }
   688 
   689 int
   690 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   691 {
   692 	SDL_Palette    *palette;
   693 	int             status = 0;
   694 
   695 	if (!_this) {
   696 		SDL_UninitializedVideo();
   697 		return -1;
   698 	}
   699 	palette = SDL_CurrentDisplay.palette;
   700 	if (!palette) {
   701 		SDL_SetError("Display mode does not have a palette");
   702 		return -1;
   703 	}
   704 	status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   705 
   706 	if (_this->SetDisplayPalette) {
   707 		if (_this->SetDisplayPalette(_this, palette) < 0) {
   708 			status = -1;
   709 		}
   710 	}
   711 	return status;
   712 }
   713 
   714 int
   715 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   716 {
   717 	SDL_Palette    *palette;
   718 
   719 	if (!_this) {
   720 		SDL_UninitializedVideo();
   721 		return -1;
   722 	}
   723 	palette = SDL_CurrentDisplay.palette;
   724 	if (!palette->ncolors) {
   725 		SDL_SetError("Display mode does not have a palette");
   726 		return -1;
   727 	}
   728 	if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   729 		SDL_SetError("Palette indices are out of range");
   730 		return -1;
   731 	}
   732 	SDL_memcpy(colors, &palette->colors[firstcolor],
   733 		   ncolors * sizeof(*colors));
   734 	return 0;
   735 }
   736 
   737 SDL_WindowID
   738 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   739 {
   740 	const Uint32    allowed_flags = (SDL_WINDOW_FULLSCREEN |
   741 					 SDL_WINDOW_OPENGL |
   742 					 SDL_WINDOW_BORDERLESS |
   743 					 SDL_WINDOW_RESIZABLE);
   744 	SDL_VideoDisplay *display;
   745 	SDL_Window      window;
   746 	int             num_windows;
   747 	SDL_Window     *windows;
   748 
   749 	if (!_this) {
   750 		SDL_UninitializedVideo();
   751 		return 0;
   752 	}
   753 	if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   754 		SDL_SetError("No OpenGL support in video driver");
   755 		return 0;
   756 	}
   757 	/* Fullscreen windows don't have any window decorations */
   758 	if (flags & SDL_WINDOW_FULLSCREEN) {
   759 		flags |= SDL_WINDOW_BORDERLESS;
   760 		flags &= ~SDL_WINDOW_RESIZABLE;
   761 	}
   762 	SDL_zero(window);
   763 	window.id = _this->next_object_id++;
   764 	window.x = x;
   765 	window.y = y;
   766 	window.w = w;
   767 	window.h = h;
   768 	window.flags = (flags & allowed_flags);
   769 	window.display = _this->current_display;
   770 
   771 	if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   772 		return 0;
   773 	}
   774 	display = &SDL_CurrentDisplay;
   775 	num_windows = display->num_windows;
   776 	windows =
   777 		SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   778 	if (!windows) {
   779 		if (_this->DestroyWindow) {
   780 			_this->DestroyWindow(_this, &window);
   781 		}
   782 		return 0;
   783 	}
   784 	windows[num_windows] = window;
   785 	display->windows = windows;
   786 	display->num_windows++;
   787 
   788 	if (title) {
   789 		SDL_SetWindowTitle(window.id, title);
   790 	}
   791 	if (flags & SDL_WINDOW_MAXIMIZED) {
   792 		SDL_MaximizeWindow(window.id);
   793 	}
   794 	if (flags & SDL_WINDOW_MINIMIZED) {
   795 		SDL_MinimizeWindow(window.id);
   796 	}
   797 	if (flags & SDL_WINDOW_SHOWN) {
   798 		SDL_ShowWindow(window.id);
   799 	}
   800 	if (flags & SDL_WINDOW_INPUT_GRABBED) {
   801 		SDL_SetWindowGrab(window.id, 1);
   802 	}
   803 	return window.id;
   804 }
   805 
   806 SDL_WindowID
   807 SDL_CreateWindowFrom(const void *data)
   808 {
   809 	SDL_VideoDisplay *display;
   810 	SDL_Window      window;
   811 	int             num_windows;
   812 	SDL_Window     *windows;
   813 
   814 	if (!_this) {
   815 		SDL_UninitializedVideo();
   816 		return (0);
   817 	}
   818 	SDL_zero(window);
   819 	window.id = _this->next_object_id++;
   820 	window.display = _this->current_display;
   821 
   822 	if (!_this->CreateWindowFrom ||
   823 	    _this->CreateWindowFrom(_this, &window, data) < 0) {
   824 		return 0;
   825 	}
   826 	display = &SDL_CurrentDisplay;
   827 	num_windows = display->num_windows;
   828 	windows =
   829 		SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   830 	if (!windows) {
   831 		if (_this->DestroyWindow) {
   832 			_this->DestroyWindow(_this, &window);
   833 		}
   834 		if (window.title) {
   835 			SDL_free(window.title);
   836 		}
   837 		return 0;
   838 	}
   839 	windows[num_windows] = window;
   840 	display->windows = windows;
   841 	display->num_windows++;
   842 
   843 	return window.id;
   844 }
   845 
   846 int
   847 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   848 {
   849 	char           *title = window->title;
   850 
   851 	if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   852 		SDL_SetError("No OpenGL support in video driver");
   853 		return -1;
   854 	}
   855 	if (_this->DestroyWindow) {
   856 		_this->DestroyWindow(_this, window);
   857 	}
   858 	window->title = NULL;
   859 	window->flags =
   860 		(flags &
   861 	  ~(SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED | SDL_WINDOW_SHOWN |
   862 	    SDL_WINDOW_INPUT_GRABBED));
   863 
   864 	if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
   865 		return -1;
   866 	}
   867 	if (title) {
   868 		SDL_SetWindowTitle(window->id, title);
   869 		SDL_free(title);
   870 	}
   871 	if (flags & SDL_WINDOW_MAXIMIZED) {
   872 		SDL_MaximizeWindow(window->id);
   873 	}
   874 	if (flags & SDL_WINDOW_MINIMIZED) {
   875 		SDL_MinimizeWindow(window->id);
   876 	}
   877 	if (flags & SDL_WINDOW_SHOWN) {
   878 		SDL_ShowWindow(window->id);
   879 	}
   880 	if (flags & SDL_WINDOW_INPUT_GRABBED) {
   881 		SDL_SetWindowGrab(window->id, 1);
   882 	}
   883 	return 0;
   884 }
   885 
   886 SDL_Window     *
   887 SDL_GetWindowFromID(SDL_WindowID windowID)
   888 {
   889 	int             i, j;
   890 
   891 	if (!_this) {
   892 		SDL_UninitializedVideo();
   893 		return NULL;
   894 	}
   895 	for (i = 0; i < _this->num_displays; ++i) {
   896 		SDL_VideoDisplay *display = &_this->displays[i];
   897 		for (j = 0; j < display->num_windows; ++j) {
   898 			SDL_Window     *window = &display->windows[j];
   899 			if (window->id == windowID) {
   900 				return window;
   901 			}
   902 		}
   903 	}
   904 	return NULL;
   905 }
   906 
   907 SDL_VideoDisplay *
   908 SDL_GetDisplayFromWindow(SDL_Window * window)
   909 {
   910 	if (!_this) {
   911 		SDL_UninitializedVideo();
   912 		return NULL;
   913 	}
   914 	if (!window) {
   915 		return NULL;
   916 	}
   917 	return &_this->displays[window->display];
   918 }
   919 
   920 Uint32
   921 SDL_GetWindowFlags(SDL_WindowID windowID)
   922 {
   923 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
   924 
   925 	if (!window) {
   926 		return 0;
   927 	}
   928 	return window->flags;
   929 }
   930 
   931 void
   932 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   933 {
   934 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
   935 
   936 	if (!window || title == window->title) {
   937 		return;
   938 	}
   939 	if (window->title) {
   940 		SDL_free(window->title);
   941 	}
   942 	if (title) {
   943 		window->title = SDL_strdup(title);
   944 	} else {
   945 		window->title = NULL;
   946 	}
   947 
   948 	if (_this->SetWindowTitle) {
   949 		_this->SetWindowTitle(_this, window);
   950 	}
   951 }
   952 
   953 const char     *
   954 SDL_GetWindowTitle(SDL_WindowID windowID)
   955 {
   956 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
   957 
   958 	if (!window) {
   959 		return NULL;
   960 	}
   961 	return window->title;
   962 }
   963 
   964 void
   965 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
   966 {
   967 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
   968 
   969 	if (!window) {
   970 		return;
   971 	}
   972 	window->userdata = userdata;
   973 }
   974 
   975 void           *
   976 SDL_GetWindowData(SDL_WindowID windowID)
   977 {
   978 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
   979 
   980 	if (!window) {
   981 		return NULL;
   982 	}
   983 	return window->userdata;
   984 }
   985 
   986 void
   987 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
   988 {
   989 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
   990 	SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
   991 
   992 	if (!window) {
   993 		return;
   994 	}
   995 	if (x == SDL_WINDOWPOS_CENTERED) {
   996 		window->x = (display->current_mode.w - window->w) / 2;
   997 	} else if (x != SDL_WINDOWPOS_UNDEFINED) {
   998 		window->x = x;
   999 	}
  1000 	if (y == SDL_WINDOWPOS_CENTERED) {
  1001 		window->y = (display->current_mode.h - window->h) / 2;
  1002 	} else if (y != SDL_WINDOWPOS_UNDEFINED) {
  1003 		window->y = y;
  1004 	}
  1005 	if (_this->SetWindowPosition) {
  1006 		_this->SetWindowPosition(_this, window);
  1007 	}
  1008 }
  1009 
  1010 void
  1011 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1012 {
  1013 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1014 
  1015 	if (!window) {
  1016 		return;
  1017 	}
  1018 	if (x) {
  1019 		*x = window->x;
  1020 	}
  1021 	if (y) {
  1022 		*y = window->y;
  1023 	}
  1024 }
  1025 
  1026 void
  1027 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1028 {
  1029 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1030 
  1031 	if (!window) {
  1032 		return;
  1033 	}
  1034 	window->w = w;
  1035 	window->h = h;
  1036 
  1037 	if (_this->SetWindowSize) {
  1038 		_this->SetWindowSize(_this, window);
  1039 	}
  1040 }
  1041 
  1042 void
  1043 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1044 {
  1045 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1046 
  1047 	if (!window) {
  1048 		return;
  1049 	}
  1050 	if (w) {
  1051 		*w = window->w;
  1052 	}
  1053 	if (h) {
  1054 		*h = window->h;
  1055 	}
  1056 }
  1057 
  1058 void
  1059 SDL_ShowWindow(SDL_WindowID windowID)
  1060 {
  1061 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1062 
  1063 	if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1064 		return;
  1065 	}
  1066 	SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1067 
  1068 	if (_this->ShowWindow) {
  1069 		_this->ShowWindow(_this, window);
  1070 	}
  1071 }
  1072 
  1073 void
  1074 SDL_HideWindow(SDL_WindowID windowID)
  1075 {
  1076 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1077 
  1078 	if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1079 		return;
  1080 	}
  1081 	SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1082 
  1083 	if (_this->HideWindow) {
  1084 		_this->HideWindow(_this, window);
  1085 	}
  1086 }
  1087 
  1088 void
  1089 SDL_RaiseWindow(SDL_WindowID windowID)
  1090 {
  1091 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1092 
  1093 	if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1094 		return;
  1095 	}
  1096 	if (_this->RaiseWindow) {
  1097 		_this->RaiseWindow(_this, window);
  1098 	}
  1099 }
  1100 
  1101 void
  1102 SDL_MaximizeWindow(SDL_WindowID windowID)
  1103 {
  1104 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1105 
  1106 	if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1107 		return;
  1108 	}
  1109 	SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1110 
  1111 	if (_this->MaximizeWindow) {
  1112 		_this->MaximizeWindow(_this, window);
  1113 	}
  1114 }
  1115 
  1116 void
  1117 SDL_MinimizeWindow(SDL_WindowID windowID)
  1118 {
  1119 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1120 
  1121 	if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1122 		return;
  1123 	}
  1124 	SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1125 
  1126 	if (_this->MinimizeWindow) {
  1127 		_this->MinimizeWindow(_this, window);
  1128 	}
  1129 }
  1130 
  1131 void
  1132 SDL_RestoreWindow(SDL_WindowID windowID)
  1133 {
  1134 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1135 
  1136 	if (!window
  1137 	|| (window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1138 		return;
  1139 	}
  1140 	SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1141 
  1142 	if (_this->RestoreWindow) {
  1143 		_this->RestoreWindow(_this, window);
  1144 	}
  1145 }
  1146 
  1147 int
  1148 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1149 {
  1150 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1151 
  1152 	if (!window) {
  1153 		return -1;
  1154 	}
  1155 	if (fullscreen) {
  1156 		fullscreen = SDL_WINDOW_FULLSCREEN;
  1157 	}
  1158 	if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1159 		return 0;
  1160 	}
  1161 	if (fullscreen) {
  1162 		window->flags |= SDL_WINDOW_FULLSCREEN;
  1163 
  1164 		if (FULLSCREEN_VISIBLE(window)) {
  1165 			SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1166 
  1167 			/* Hide any other fullscreen windows */
  1168 			int             i;
  1169 			for (i = 0; i < display->num_windows; ++i) {
  1170 				SDL_Window     *other = &display->windows[i];
  1171 				if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1172 					SDL_MinimizeWindow(other->id);
  1173 				}
  1174 			}
  1175 
  1176 			SDL_SetDisplayMode(&display->fullscreen_mode);
  1177 		}
  1178 	} else {
  1179 		window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1180 
  1181 		if (FULLSCREEN_VISIBLE(window)) {
  1182 			SDL_SetDisplayMode(NULL);
  1183 		}
  1184 	}
  1185 	return 0;
  1186 }
  1187 
  1188 void
  1189 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1190 {
  1191 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1192 
  1193 	if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1194 		return;
  1195 	}
  1196 	if (mode) {
  1197 		window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1198 	} else {
  1199 		window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1200 	}
  1201 
  1202 	if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1203 		_this->SetWindowGrab(_this, window);
  1204 	}
  1205 }
  1206 
  1207 int
  1208 SDL_GetWindowGrab(SDL_WindowID windowID)
  1209 {
  1210 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1211 
  1212 	if (!window) {
  1213 		return 0;
  1214 	}
  1215 	return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1216 }
  1217 
  1218 void
  1219 SDL_OnWindowShown(SDL_Window * window)
  1220 {
  1221 }
  1222 
  1223 void
  1224 SDL_OnWindowHidden(SDL_Window * window)
  1225 {
  1226 }
  1227 
  1228 void
  1229 SDL_OnWindowResized(SDL_Window * window)
  1230 {
  1231 	SDL_Renderer   *renderer = window->renderer;
  1232 
  1233 	if (renderer && renderer->DisplayModeChanged) {
  1234 		renderer->DisplayModeChanged(renderer);
  1235 	}
  1236 }
  1237 
  1238 void
  1239 SDL_OnWindowFocusGained(SDL_Window * window)
  1240 {
  1241 	SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1242 
  1243 	if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1244 		SDL_SetDisplayMode(&display->fullscreen_mode);
  1245 	}
  1246 	if (display->gamma && _this->SetDisplayGammaRamp) {
  1247 		_this->SetDisplayGammaRamp(_this, display->gamma);
  1248 	}
  1249 	if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1250 		_this->SetWindowGrab(_this, window);
  1251 	}
  1252 }
  1253 
  1254 void
  1255 SDL_OnWindowFocusLost(SDL_Window * window)
  1256 {
  1257 	SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1258 
  1259 	if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1260 		SDL_MinimizeWindow(window->id);
  1261 		SDL_SetDisplayMode(NULL);
  1262 	}
  1263 	if (display->gamma && _this->SetDisplayGammaRamp) {
  1264 		_this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1265 	}
  1266 	if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1267 		_this->SetWindowGrab(_this, window);
  1268 	}
  1269 }
  1270 
  1271 SDL_WindowID
  1272 SDL_GetFocusWindow(void)
  1273 {
  1274 	SDL_VideoDisplay *display;
  1275 	int             i;
  1276 
  1277 	if (!_this) {
  1278 		return 0;
  1279 	}
  1280 	display = &SDL_CurrentDisplay;
  1281 	for (i = 0; i < display->num_windows; ++i) {
  1282 		SDL_Window     *window = &display->windows[i];
  1283 
  1284 		if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1285 			return window->id;
  1286 		}
  1287 	}
  1288 	return 0;
  1289 }
  1290 
  1291 void
  1292 SDL_DestroyWindow(SDL_WindowID windowID)
  1293 {
  1294 	int             i, j;
  1295 
  1296 	if (!_this) {
  1297 		return;
  1298 	}
  1299 	/* Restore video mode, etc. */
  1300 	SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1301 
  1302 	for (i = 0; i < _this->num_displays; ++i) {
  1303 		SDL_VideoDisplay *display = &_this->displays[i];
  1304 		for (j = 0; j < display->num_windows; ++j) {
  1305 			SDL_Window     *window = &display->windows[j];
  1306 			if (window->id != windowID) {
  1307 				continue;
  1308 			}
  1309 			if (window->title) {
  1310 				SDL_free(window->title);
  1311 				window->title = NULL;
  1312 			}
  1313 			if (window->renderer) {
  1314 				SDL_DestroyRenderer(window->id);
  1315 				window->renderer = NULL;
  1316 			}
  1317 			if (_this->DestroyWindow) {
  1318 				_this->DestroyWindow(_this, window);
  1319 			}
  1320 			if (j != display->num_windows - 1) {
  1321 				SDL_memcpy(&display->windows[i],
  1322 					   &display->windows[i + 1],
  1323 					   (display->num_windows - i - 1) * sizeof(*window));
  1324 			}
  1325 			--display->num_windows;
  1326 			return;
  1327 		}
  1328 	}
  1329 }
  1330 
  1331 void
  1332 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1333 {
  1334 	SDL_VideoDisplay *display;
  1335 	SDL_RenderDriver *render_drivers;
  1336 
  1337 	if (displayIndex >= _this->num_displays) {
  1338 		return;
  1339 	}
  1340 	display = &_this->displays[displayIndex];
  1341 
  1342 	render_drivers =
  1343 		SDL_realloc(display->render_drivers,
  1344 			    (display->num_render_drivers +
  1345 			     1) * sizeof(*render_drivers));
  1346 	if (render_drivers) {
  1347 		render_drivers[display->num_render_drivers] = *driver;
  1348 		display->render_drivers = render_drivers;
  1349 		display->num_render_drivers++;
  1350 	}
  1351 }
  1352 
  1353 int
  1354 SDL_GetNumRenderDrivers(void)
  1355 {
  1356 	if (_this) {
  1357 		return SDL_CurrentDisplay.num_render_drivers;
  1358 	}
  1359 	return 0;
  1360 }
  1361 
  1362 int
  1363 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1364 {
  1365 	if (!_this) {
  1366 		SDL_UninitializedVideo();
  1367 		return -1;
  1368 	}
  1369 	if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1370 		SDL_SetError("index must be in the range of 0 - %d",
  1371 			     SDL_GetNumRenderDrivers() - 1);
  1372 		return -1;
  1373 	}
  1374 	*info = SDL_CurrentDisplay.render_drivers[index].info;
  1375 	return 0;
  1376 }
  1377 
  1378 int
  1379 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1380 {
  1381 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1382 
  1383 	if (!window) {
  1384 		return 0;
  1385 	}
  1386 	if (index < 0) {
  1387 		const char     *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1388 		int             n = SDL_GetNumRenderDrivers();
  1389 		for (index = 0; index < n; ++index) {
  1390 			SDL_RenderDriver *driver =
  1391 			&SDL_CurrentDisplay.render_drivers[index];
  1392 
  1393 			if (override) {
  1394 				if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1395 					break;
  1396 				}
  1397 			} else {
  1398 				if ((driver->info.flags & flags) == flags) {
  1399 					break;
  1400 				}
  1401 			}
  1402 		}
  1403 		if (index == n) {
  1404 			SDL_SetError("Couldn't find matching render driver");
  1405 			return -1;
  1406 		}
  1407 	}
  1408 	if (index >= SDL_GetNumRenderDrivers()) {
  1409 		SDL_SetError("index must be -1 or in the range of 0 - %d",
  1410 			     SDL_GetNumRenderDrivers() - 1);
  1411 		return -1;
  1412 	}
  1413 	/* Free any existing renderer */
  1414 	SDL_DestroyRenderer(windowID);
  1415 
  1416 	/* Create a new renderer instance */
  1417 	window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1418 		.CreateRenderer(window, flags);
  1419 	SDL_SelectRenderer(window->id);
  1420 
  1421 	return 0;
  1422 }
  1423 
  1424 int
  1425 SDL_SelectRenderer(SDL_WindowID windowID)
  1426 {
  1427 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  1428 	SDL_Renderer   *renderer;
  1429 
  1430 	if (!window || !window->renderer) {
  1431 		return -1;
  1432 	}
  1433 	renderer = window->renderer;
  1434 	if (renderer && renderer->ActivateRenderer) {
  1435 		if (renderer->ActivateRenderer(renderer) < 0) {
  1436 			return -1;
  1437 		}
  1438 	}
  1439 	SDL_CurrentDisplay.current_renderer = renderer;
  1440 	return 0;
  1441 }
  1442 
  1443 int
  1444 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1445 {
  1446 	if (!_this) {
  1447 		SDL_UninitializedVideo();
  1448 		return -1;
  1449 	}
  1450 	if (!SDL_CurrentDisplay.current_renderer) {
  1451 		SDL_SetError("There is no current renderer");
  1452 		return -1;
  1453 	}
  1454 	*info = SDL_CurrentDisplay.current_renderer->info;
  1455 	return 0;
  1456 }
  1457 
  1458 SDL_TextureID
  1459 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1460 {
  1461 	int             hash;
  1462 	SDL_Renderer   *renderer;
  1463 	SDL_Texture    *texture;
  1464 
  1465 	if (!_this) {
  1466 		SDL_UninitializedVideo();
  1467 		return 0;
  1468 	}
  1469 	renderer = SDL_CurrentDisplay.current_renderer;
  1470 	if (!renderer || !renderer->CreateTexture) {
  1471 		return 0;
  1472 	}
  1473 	texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1474 	if (!texture) {
  1475 		SDL_OutOfMemory();
  1476 		return 0;
  1477 	}
  1478 	texture->id = _this->next_object_id++;
  1479 	texture->format = format;
  1480 	texture->access = access;
  1481 	texture->w = w;
  1482 	texture->h = h;
  1483 	texture->r = 255;
  1484 	texture->g = 255;
  1485 	texture->b = 255;
  1486 	texture->a = 255;
  1487 	texture->renderer = renderer;
  1488 
  1489 	if (renderer->CreateTexture(renderer, texture) < 0) {
  1490 		if (renderer->DestroyTexture) {
  1491 			renderer->DestroyTexture(renderer, texture);
  1492 		}
  1493 		SDL_free(texture);
  1494 		return 0;
  1495 	}
  1496 	hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1497 	texture->next = SDL_CurrentDisplay.textures[hash];
  1498 	SDL_CurrentDisplay.textures[hash] = texture;
  1499 
  1500 	return texture->id;
  1501 }
  1502 
  1503 SDL_TextureID
  1504 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1505 {
  1506 	SDL_TextureID   textureID;
  1507 	SDL_PixelFormat *fmt;
  1508 	int             bpp;
  1509 	Uint32          Rmask, Gmask, Bmask, Amask;
  1510 
  1511 	if (!surface) {
  1512 		SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1513 		return 0;
  1514 	}
  1515 	fmt = surface->format;
  1516 
  1517 	if (format) {
  1518 		if (!SDL_PixelFormatEnumToMasks
  1519 		    (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1520 			SDL_SetError("Unknown pixel format");
  1521 			return 0;
  1522 		}
  1523 	} else {
  1524 		if (surface->format->Amask
  1525 		    || !(surface->map->info.flags &
  1526 		    (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1527 			bpp = fmt->BitsPerPixel;
  1528 			Rmask = fmt->Rmask;
  1529 			Gmask = fmt->Gmask;
  1530 			Bmask = fmt->Bmask;
  1531 			Amask = fmt->Amask;
  1532 		} else {
  1533 			/* Need a format with alpha */
  1534 			bpp = 32;
  1535 			Rmask = 0x00FF0000;
  1536 			Gmask = 0x0000FF00;
  1537 			Bmask = 0x000000FF;
  1538 			Amask = 0xFF000000;
  1539 		}
  1540 		format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1541 		if (!format) {
  1542 			SDL_SetError("Unknown pixel format");
  1543 			return 0;
  1544 		}
  1545 	}
  1546 
  1547 	textureID =
  1548 		SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1549 				  surface->h);
  1550 	if (!textureID) {
  1551 		return 0;
  1552 	}
  1553 	if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1554 	    && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1555 		if (SDL_MUSTLOCK(surface)) {
  1556 			if (SDL_LockSurface(surface) < 0) {
  1557 				SDL_DestroyTexture(textureID);
  1558 				return 0;
  1559 			}
  1560 			SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1561 					  surface->pitch);
  1562 			SDL_UnlockSurface(surface);
  1563 		} else {
  1564 			SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1565 					  surface->pitch);
  1566 		}
  1567 	} else {
  1568 		SDL_PixelFormat *dst_fmt;
  1569 		SDL_Surface    *dst = NULL;
  1570 
  1571 		/* Set up a destination surface for the texture update */
  1572 		dst_fmt = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
  1573 		if (dst_fmt) {
  1574 			if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1575 				dst_fmt->palette =
  1576 					SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1577 				if (dst_fmt->palette) {
  1578 					/*
  1579 					 * FIXME: Should we try to copy
  1580 					 * fmt->palette?
  1581 					 */
  1582 					SDL_DitherColors(dst_fmt->palette->colors,
  1583 						  SDL_BITSPERPIXEL(format));
  1584 				}
  1585 			}
  1586 			dst = SDL_ConvertSurface(surface, dst_fmt, 0);
  1587 			if (dst) {
  1588 				SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1589 				SDL_FreeSurface(dst);
  1590 			}
  1591 			if (dst_fmt->palette) {
  1592 				SDL_FreePalette(dst_fmt->palette);
  1593 			}
  1594 			SDL_FreeFormat(dst_fmt);
  1595 		}
  1596 		if (!dst) {
  1597 			SDL_DestroyTexture(textureID);
  1598 			return 0;
  1599 		}
  1600 	}
  1601 
  1602 	if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1603 		SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1604 				      fmt->palette->ncolors);
  1605 	}
  1606 	return textureID;
  1607 }
  1608 
  1609 static __inline__ SDL_Texture *
  1610 SDL_GetTextureFromID(SDL_TextureID textureID)
  1611 {
  1612 	int             hash;
  1613 	SDL_Texture    *texture;
  1614 
  1615 	if (!_this) {
  1616 		return NULL;
  1617 	}
  1618 	hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1619 	for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1620 	     texture = texture->next) {
  1621 		if (texture->id == textureID) {
  1622 			return texture;
  1623 		}
  1624 	}
  1625 	return NULL;
  1626 }
  1627 
  1628 int
  1629 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1630 		 int *w, int *h)
  1631 {
  1632 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1633 
  1634 	if (!texture) {
  1635 		return -1;
  1636 	}
  1637 	if (format) {
  1638 		*format = texture->format;
  1639 	}
  1640 	if (access) {
  1641 		*access = texture->access;
  1642 	}
  1643 	if (w) {
  1644 		*w = texture->w;
  1645 	}
  1646 	if (h) {
  1647 		*h = texture->h;
  1648 	}
  1649 	return 0;
  1650 }
  1651 
  1652 int
  1653 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1654 {
  1655 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1656 	SDL_Renderer   *renderer;
  1657 
  1658 	if (!texture) {
  1659 		return -1;
  1660 	}
  1661 	renderer = texture->renderer;
  1662 	if (!renderer->QueryTexturePixels) {
  1663 		return -1;
  1664 	}
  1665 	return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1666 }
  1667 
  1668 int
  1669 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1670 		      int firstcolor, int ncolors)
  1671 {
  1672 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1673 	SDL_Renderer   *renderer;
  1674 
  1675 	if (!texture) {
  1676 		return -1;
  1677 	}
  1678 	renderer = texture->renderer;
  1679 	if (!renderer->SetTexturePalette) {
  1680 		return -1;
  1681 	}
  1682 	return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1683 					   ncolors);
  1684 }
  1685 
  1686 int
  1687 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1688 		      int firstcolor, int ncolors)
  1689 {
  1690 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1691 	SDL_Renderer   *renderer;
  1692 
  1693 	if (!texture) {
  1694 		return -1;
  1695 	}
  1696 	renderer = texture->renderer;
  1697 	if (!renderer->GetTexturePalette) {
  1698 		return -1;
  1699 	}
  1700 	return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1701 					   ncolors);
  1702 }
  1703 
  1704 int
  1705 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1706 {
  1707 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1708 	SDL_Renderer   *renderer;
  1709 
  1710 	if (!texture) {
  1711 		return -1;
  1712 	}
  1713 	renderer = texture->renderer;
  1714 	if (!renderer->SetTextureColorMod) {
  1715 		return -1;
  1716 	}
  1717 	if (r < 255 || g < 255 || b < 255) {
  1718 		texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1719 	} else {
  1720 		texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1721 	}
  1722 	texture->r = r;
  1723 	texture->g = g;
  1724 	texture->b = b;
  1725 	return renderer->SetTextureColorMod(renderer, texture);
  1726 }
  1727 
  1728 int
  1729 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1730 		       Uint8 * b)
  1731 {
  1732 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1733 	SDL_Renderer   *renderer;
  1734 
  1735 	if (!texture) {
  1736 		return -1;
  1737 	}
  1738 	renderer = texture->renderer;
  1739 	if (r) {
  1740 		*r = texture->r;
  1741 	}
  1742 	if (g) {
  1743 		*g = texture->g;
  1744 	}
  1745 	if (b) {
  1746 		*b = texture->b;
  1747 	}
  1748 	return 0;
  1749 }
  1750 
  1751 int
  1752 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1753 {
  1754 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1755 	SDL_Renderer   *renderer;
  1756 
  1757 	if (!texture) {
  1758 		return -1;
  1759 	}
  1760 	renderer = texture->renderer;
  1761 	if (!renderer->SetTextureAlphaMod) {
  1762 		return -1;
  1763 	}
  1764 	if (alpha < 255) {
  1765 		texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1766 	} else {
  1767 		texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1768 	}
  1769 	texture->a = alpha;
  1770 	return renderer->SetTextureAlphaMod(renderer, texture);
  1771 }
  1772 
  1773 int
  1774 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1775 {
  1776 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1777 
  1778 	if (!texture) {
  1779 		return -1;
  1780 	}
  1781 	if (alpha) {
  1782 		*alpha = texture->a;
  1783 	}
  1784 	return 0;
  1785 }
  1786 
  1787 int
  1788 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1789 {
  1790 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1791 	SDL_Renderer   *renderer;
  1792 
  1793 	if (!texture) {
  1794 		return -1;
  1795 	}
  1796 	renderer = texture->renderer;
  1797 	if (!renderer->SetTextureBlendMode) {
  1798 		return -1;
  1799 	}
  1800 	texture->blendMode = blendMode;
  1801 	return renderer->SetTextureBlendMode(renderer, texture);
  1802 }
  1803 
  1804 int
  1805 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1806 {
  1807 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1808 
  1809 	if (!texture) {
  1810 		return -1;
  1811 	}
  1812 	if (blendMode) {
  1813 		*blendMode = texture->blendMode;
  1814 	}
  1815 	return 0;
  1816 }
  1817 
  1818 int
  1819 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1820 {
  1821 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1822 	SDL_Renderer   *renderer;
  1823 
  1824 	if (!texture) {
  1825 		return -1;
  1826 	}
  1827 	renderer = texture->renderer;
  1828 	if (!renderer->SetTextureScaleMode) {
  1829 		return -1;
  1830 	}
  1831 	texture->scaleMode = scaleMode;
  1832 	return renderer->SetTextureScaleMode(renderer, texture);
  1833 }
  1834 
  1835 int
  1836 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1837 {
  1838 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1839 
  1840 	if (!texture) {
  1841 		return -1;
  1842 	}
  1843 	if (scaleMode) {
  1844 		*scaleMode = texture->scaleMode;
  1845 	}
  1846 	return 0;
  1847 }
  1848 
  1849 int
  1850 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1851 		  const void *pixels, int pitch)
  1852 {
  1853 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1854 	SDL_Renderer   *renderer;
  1855 	SDL_Rect        full_rect;
  1856 
  1857 	if (!texture) {
  1858 		return -1;
  1859 	}
  1860 	renderer = texture->renderer;
  1861 	if (!renderer->UpdateTexture) {
  1862 		return -1;
  1863 	}
  1864 	if (!rect) {
  1865 		full_rect.x = 0;
  1866 		full_rect.y = 0;
  1867 		full_rect.w = texture->w;
  1868 		full_rect.h = texture->h;
  1869 		rect = &full_rect;
  1870 	}
  1871 	return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1872 }
  1873 
  1874 int
  1875 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1876 		void **pixels, int *pitch)
  1877 {
  1878 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1879 	SDL_Renderer   *renderer;
  1880 	SDL_Rect        full_rect;
  1881 
  1882 	if (!texture) {
  1883 		return -1;
  1884 	}
  1885 	if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1886 		SDL_SetError("SDL_LockTexture(): texture must be streaming");
  1887 		return -1;
  1888 	}
  1889 	renderer = texture->renderer;
  1890 	if (!renderer->LockTexture) {
  1891 		return -1;
  1892 	}
  1893 	if (!rect) {
  1894 		full_rect.x = 0;
  1895 		full_rect.y = 0;
  1896 		full_rect.w = texture->w;
  1897 		full_rect.h = texture->h;
  1898 		rect = &full_rect;
  1899 	}
  1900 	return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  1901 				     pitch);
  1902 }
  1903 
  1904 void
  1905 SDL_UnlockTexture(SDL_TextureID textureID)
  1906 {
  1907 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1908 	SDL_Renderer   *renderer;
  1909 
  1910 	if (!texture) {
  1911 		return;
  1912 	}
  1913 	if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1914 		return;
  1915 	}
  1916 	renderer = texture->renderer;
  1917 	if (!renderer->UnlockTexture) {
  1918 		return;
  1919 	}
  1920 	renderer->UnlockTexture(renderer, texture);
  1921 }
  1922 
  1923 void
  1924 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  1925 		 const SDL_Rect * rects)
  1926 {
  1927 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1928 	SDL_Renderer   *renderer;
  1929 
  1930 	if (!texture) {
  1931 		return;
  1932 	}
  1933 	if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1934 		return;
  1935 	}
  1936 	renderer = texture->renderer;
  1937 	if (!renderer->DirtyTexture) {
  1938 		return;
  1939 	}
  1940 	renderer->DirtyTexture(renderer, texture, numrects, rects);
  1941 }
  1942 
  1943 int
  1944 SDL_RenderFill(Uint8 r, Uint8 g, Uint8 b, Uint8 a, const SDL_Rect * rect)
  1945 {
  1946 	SDL_Renderer   *renderer;
  1947 	SDL_Window     *window;
  1948 	SDL_Rect        real_rect;
  1949 
  1950 	if (!_this) {
  1951 		SDL_UninitializedVideo();
  1952 		return -1;
  1953 	}
  1954 	renderer = SDL_CurrentDisplay.current_renderer;
  1955 	if (!renderer || !renderer->RenderFill) {
  1956 		return -1;
  1957 	}
  1958 	window = SDL_GetWindowFromID(renderer->window);
  1959 	real_rect.x = 0;
  1960 	real_rect.y = 0;
  1961 	real_rect.w = window->w;
  1962 	real_rect.h = window->h;
  1963 	if (rect) {
  1964 		if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  1965 			return 0;
  1966 		}
  1967 	}
  1968 	return renderer->RenderFill(renderer, r, g, b, a, &real_rect);
  1969 }
  1970 
  1971 int
  1972 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  1973 	       const SDL_Rect * dstrect)
  1974 {
  1975 	SDL_Texture    *texture = SDL_GetTextureFromID(textureID);
  1976 	SDL_Renderer   *renderer;
  1977 	SDL_Window     *window;
  1978 	SDL_Rect        real_srcrect;
  1979 	SDL_Rect        real_dstrect;
  1980 
  1981 	if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  1982 		return -1;
  1983 	}
  1984 	renderer = SDL_CurrentDisplay.current_renderer;
  1985 	if (!renderer || !renderer->RenderCopy) {
  1986 		return -1;
  1987 	}
  1988 	window = SDL_GetWindowFromID(renderer->window);
  1989 	if (srcrect) {
  1990 		real_srcrect = *srcrect;
  1991 	} else {
  1992 		real_srcrect.x = 0;
  1993 		real_srcrect.y = 0;
  1994 		real_srcrect.w = texture->w;
  1995 		real_srcrect.h = texture->h;
  1996 	}
  1997 	if (dstrect) {
  1998 		real_dstrect = *dstrect;
  1999 	} else {
  2000 		real_dstrect.x = 0;
  2001 		real_dstrect.y = 0;
  2002 		real_dstrect.w = window->w;
  2003 		real_dstrect.h = window->h;
  2004 	}
  2005 
  2006 	return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2007 				    &real_dstrect);
  2008 }
  2009 
  2010 void
  2011 SDL_RenderPresent(void)
  2012 {
  2013 	SDL_Renderer   *renderer;
  2014 
  2015 	if (!_this) {
  2016 		SDL_UninitializedVideo();
  2017 		return;
  2018 	}
  2019 	renderer = SDL_CurrentDisplay.current_renderer;
  2020 	if (!renderer || !renderer->RenderPresent) {
  2021 		return;
  2022 	}
  2023 	renderer->RenderPresent(renderer);
  2024 }
  2025 
  2026 void
  2027 SDL_DestroyTexture(SDL_TextureID textureID)
  2028 {
  2029 	int             hash;
  2030 	SDL_Texture    *prev, *texture;
  2031 	SDL_Renderer   *renderer;
  2032 
  2033 	if (!_this) {
  2034 		SDL_UninitializedVideo();
  2035 		return;
  2036 	}
  2037 	/* Look up the texture in the hash table */
  2038 	hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2039 	prev = NULL;
  2040 	for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2041 	     prev = texture, texture = texture->next) {
  2042 		if (texture->id == textureID) {
  2043 			break;
  2044 		}
  2045 	}
  2046 	if (!texture) {
  2047 		return;
  2048 	}
  2049 	/* Unlink the texture from the list */
  2050 	if (prev) {
  2051 		prev->next = texture->next;
  2052 	} else {
  2053 		SDL_CurrentDisplay.textures[hash] = texture->next;
  2054 	}
  2055 
  2056 	/* Free the texture */
  2057 	renderer = texture->renderer;
  2058 	renderer->DestroyTexture(renderer, texture);
  2059 	SDL_free(texture);
  2060 }
  2061 
  2062 void
  2063 SDL_DestroyRenderer(SDL_WindowID windowID)
  2064 {
  2065 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  2066 	SDL_Renderer   *renderer;
  2067 	int             i;
  2068 
  2069 	if (!window) {
  2070 		return;
  2071 	}
  2072 	renderer = window->renderer;
  2073 	if (!renderer) {
  2074 		return;
  2075 	}
  2076 	/* Free existing textures for this renderer */
  2077 	for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2078 		SDL_Texture    *texture;
  2079 		SDL_Texture    *prev = NULL;
  2080 		SDL_Texture    *next;
  2081 		for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2082 		     texture = next) {
  2083 			next = texture->next;
  2084 			if (texture->renderer == renderer) {
  2085 				if (prev) {
  2086 					prev->next = next;
  2087 				} else {
  2088 					SDL_CurrentDisplay.textures[i] = next;
  2089 				}
  2090 				renderer->DestroyTexture(renderer, texture);
  2091 				SDL_free(texture);
  2092 			} else {
  2093 				prev = texture;
  2094 			}
  2095 		}
  2096 	}
  2097 
  2098 	/* Free the renderer instance */
  2099 	renderer->DestroyRenderer(renderer);
  2100 
  2101 	/* Clear references */
  2102 	window->renderer = NULL;
  2103 	if (SDL_CurrentDisplay.current_renderer == renderer) {
  2104 		SDL_CurrentDisplay.current_renderer = NULL;
  2105 	}
  2106 }
  2107 
  2108 void
  2109 SDL_VideoQuit(void)
  2110 {
  2111 	int             i, j;
  2112 
  2113 	if (!_this) {
  2114 		return;
  2115 	}
  2116 	/* Halt event processing before doing anything else */
  2117 	SDL_StopEventLoop();
  2118 
  2119 	/* Clean up the system video */
  2120 	for (i = _this->num_displays; i--;) {
  2121 		SDL_VideoDisplay *display = &_this->displays[i];
  2122 		for (j = display->num_windows; j--;) {
  2123 			SDL_DestroyWindow(display->windows[i].id);
  2124 		}
  2125 		if (display->windows) {
  2126 			SDL_free(display->windows);
  2127 			display->windows = NULL;
  2128 		}
  2129 		display->num_windows = 0;
  2130 		if (display->render_drivers) {
  2131 			SDL_free(display->render_drivers);
  2132 			display->render_drivers = NULL;
  2133 		}
  2134 		display->num_render_drivers = 0;
  2135 	}
  2136 	_this->VideoQuit(_this);
  2137 
  2138 	for (i = _this->num_displays; i--;) {
  2139 		SDL_VideoDisplay *display = &_this->displays[i];
  2140 		for (j = display->num_display_modes; j--;) {
  2141 			if (display->display_modes[j].driverdata) {
  2142 				SDL_free(display->display_modes[j].driverdata);
  2143 				display->display_modes[j].driverdata = NULL;
  2144 			}
  2145 		}
  2146 		if (display->display_modes) {
  2147 			SDL_free(display->display_modes);
  2148 			display->display_modes = NULL;
  2149 		}
  2150 		if (display->desktop_mode.driverdata) {
  2151 			SDL_free(display->desktop_mode.driverdata);
  2152 			display->desktop_mode.driverdata = NULL;
  2153 		}
  2154 		if (display->palette) {
  2155 			SDL_FreePalette(display->palette);
  2156 			display->palette = NULL;
  2157 		}
  2158 		if (display->gamma) {
  2159 			SDL_free(display->gamma);
  2160 			display->gamma = NULL;
  2161 		}
  2162 		if (display->driverdata) {
  2163 			SDL_free(display->driverdata);
  2164 			display->driverdata = NULL;
  2165 		}
  2166 	}
  2167 	if (_this->displays) {
  2168 		SDL_free(_this->displays);
  2169 		_this->displays = NULL;
  2170 	}
  2171 	_this->free(_this);
  2172 	_this = NULL;
  2173 }
  2174 
  2175 int
  2176 SDL_GL_LoadLibrary(const char *path)
  2177 {
  2178 	int             retval;
  2179 
  2180 	if (!_this) {
  2181 		SDL_UninitializedVideo();
  2182 		return -1;
  2183 	}
  2184 	if (_this->GL_LoadLibrary) {
  2185 		retval = _this->GL_LoadLibrary(_this, path);
  2186 	} else {
  2187 		SDL_SetError("No dynamic GL support in video driver");
  2188 		retval = -1;
  2189 	}
  2190 	return (retval);
  2191 }
  2192 
  2193 void           *
  2194 SDL_GL_GetProcAddress(const char *proc)
  2195 {
  2196 	void           *func;
  2197 
  2198 	if (!_this) {
  2199 		SDL_UninitializedVideo();
  2200 		return NULL;
  2201 	}
  2202 	func = NULL;
  2203 	if (_this->GL_GetProcAddress) {
  2204 		if (_this->gl_config.driver_loaded) {
  2205 			func = _this->GL_GetProcAddress(_this, proc);
  2206 		} else {
  2207 			SDL_SetError("No GL driver has been loaded");
  2208 		}
  2209 	} else {
  2210 		SDL_SetError("No dynamic GL support in video driver");
  2211 	}
  2212 	return func;
  2213 }
  2214 
  2215 SDL_bool
  2216 SDL_GL_ExtensionSupported(const char *extension)
  2217 {
  2218 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2219 	const GLubyte  *(APIENTRY * glGetStringFunc) (GLenum);
  2220 	const char     *extensions;
  2221 	const char     *start;
  2222 	const char     *where, *terminator;
  2223 
  2224 	/* Extension names should not have spaces. */
  2225 	where = SDL_strchr(extension, ' ');
  2226 	if (where || *extension == '\0') {
  2227 		return SDL_FALSE;
  2228 	}
  2229 	/* See if there's an environment variable override */
  2230 	start = SDL_getenv(extension);
  2231 	if (start && *start == '0') {
  2232 		return SDL_FALSE;
  2233 	}
  2234 	/* Lookup the available extensions */
  2235 	glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2236 	if (glGetStringFunc) {
  2237 		extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2238 	} else {
  2239 		extensions = NULL;
  2240 	}
  2241 	if (!extensions) {
  2242 		return SDL_FALSE;
  2243 	}
  2244 	/*
  2245 	 * It takes a bit of care to be fool-proof about parsing the OpenGL
  2246 	 * extensions string. Don't be fooled by sub-strings, etc.
  2247 	 */
  2248 
  2249 	start = extensions;
  2250 
  2251 	for (;;) {
  2252 		where = SDL_strstr(start, extension);
  2253 		if (!where)
  2254 			break;
  2255 
  2256 		terminator = where + SDL_strlen(extension);
  2257 		if (where == start || *(where - 1) == ' ')
  2258 			if (*terminator == ' ' || *terminator == '\0')
  2259 				return SDL_TRUE;
  2260 
  2261 		start = terminator;
  2262 	}
  2263 	return SDL_FALSE;
  2264 #else
  2265 	return SDL_FALSE;
  2266 #endif
  2267 }
  2268 
  2269 int
  2270 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2271 {
  2272 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2273 	int             retval;
  2274 
  2275 	if (!_this) {
  2276 		SDL_UninitializedVideo();
  2277 		return -1;
  2278 	}
  2279 	retval = 0;
  2280 	switch (attr) {
  2281 	case SDL_GL_RED_SIZE:
  2282 		_this->gl_config.red_size = value;
  2283 		break;
  2284 	case SDL_GL_GREEN_SIZE:
  2285 		_this->gl_config.green_size = value;
  2286 		break;
  2287 	case SDL_GL_BLUE_SIZE:
  2288 		_this->gl_config.blue_size = value;
  2289 		break;
  2290 	case SDL_GL_ALPHA_SIZE:
  2291 		_this->gl_config.alpha_size = value;
  2292 		break;
  2293 	case SDL_GL_DOUBLEBUFFER:
  2294 		_this->gl_config.double_buffer = value;
  2295 		break;
  2296 	case SDL_GL_BUFFER_SIZE:
  2297 		_this->gl_config.buffer_size = value;
  2298 		break;
  2299 	case SDL_GL_DEPTH_SIZE:
  2300 		_this->gl_config.depth_size = value;
  2301 		break;
  2302 	case SDL_GL_STENCIL_SIZE:
  2303 		_this->gl_config.stencil_size = value;
  2304 		break;
  2305 	case SDL_GL_ACCUM_RED_SIZE:
  2306 		_this->gl_config.accum_red_size = value;
  2307 		break;
  2308 	case SDL_GL_ACCUM_GREEN_SIZE:
  2309 		_this->gl_config.accum_green_size = value;
  2310 		break;
  2311 	case SDL_GL_ACCUM_BLUE_SIZE:
  2312 		_this->gl_config.accum_blue_size = value;
  2313 		break;
  2314 	case SDL_GL_ACCUM_ALPHA_SIZE:
  2315 		_this->gl_config.accum_alpha_size = value;
  2316 		break;
  2317 	case SDL_GL_STEREO:
  2318 		_this->gl_config.stereo = value;
  2319 		break;
  2320 	case SDL_GL_MULTISAMPLEBUFFERS:
  2321 		_this->gl_config.multisamplebuffers = value;
  2322 		break;
  2323 	case SDL_GL_MULTISAMPLESAMPLES:
  2324 		_this->gl_config.multisamplesamples = value;
  2325 		break;
  2326 	case SDL_GL_ACCELERATED_VISUAL:
  2327 		_this->gl_config.accelerated = value;
  2328 		break;
  2329 	case SDL_GL_RETAINED_BACKING:
  2330 		_this->gl_config.retained_backing = value;
  2331 		break;
  2332 	default:
  2333 		SDL_SetError("Unknown OpenGL attribute");
  2334 		retval = -1;
  2335 		break;
  2336 	}
  2337 	return retval;
  2338 #else
  2339 	SDL_Unsupported();
  2340 	return -1;
  2341 #endif				/* SDL_VIDEO_OPENGL */
  2342 }
  2343 
  2344 int
  2345 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2346 {
  2347 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2348 	void            (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2349 	GLenum          attrib = 0;
  2350 
  2351 	glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2352 	if (!glGetIntegervFunc) {
  2353 		return -1;
  2354 	}
  2355 	switch (attr) {
  2356 	case SDL_GL_RETAINED_BACKING:
  2357 		*value = _this->gl_config.retained_backing;
  2358 		return 0;
  2359 	case SDL_GL_RED_SIZE:
  2360 		attrib = GL_RED_BITS;
  2361 		break;
  2362 	case SDL_GL_BLUE_SIZE:
  2363 		attrib = GL_BLUE_BITS;
  2364 		break;
  2365 	case SDL_GL_GREEN_SIZE:
  2366 		attrib = GL_GREEN_BITS;
  2367 		break;
  2368 	case SDL_GL_ALPHA_SIZE:
  2369 		attrib = GL_ALPHA_BITS;
  2370 		break;
  2371 	case SDL_GL_DOUBLEBUFFER:
  2372 #ifndef SDL_VIDEO_OPENGL_ES
  2373 		attrib = GL_DOUBLEBUFFER;
  2374 		break;
  2375 #else
  2376 		/*
  2377 		 * I believe double buffering is the only option in OpenGL ES
  2378 		 * -- in any case, GL_DOUBLEBUFFER doesn't exist
  2379 		 */
  2380 		*value = 1;
  2381 		return 0;
  2382 #endif
  2383 	case SDL_GL_DEPTH_SIZE:
  2384 		attrib = GL_DEPTH_BITS;
  2385 		break;
  2386 	case SDL_GL_STENCIL_SIZE:
  2387 		attrib = GL_STENCIL_BITS;
  2388 		break;
  2389 #ifndef SDL_VIDEO_OPENGL_ES
  2390 	case SDL_GL_ACCUM_RED_SIZE:
  2391 		attrib = GL_ACCUM_RED_BITS;
  2392 		break;
  2393 	case SDL_GL_ACCUM_GREEN_SIZE:
  2394 		attrib = GL_ACCUM_GREEN_BITS;
  2395 		break;
  2396 	case SDL_GL_ACCUM_BLUE_SIZE:
  2397 		attrib = GL_ACCUM_BLUE_BITS;
  2398 		break;
  2399 	case SDL_GL_ACCUM_ALPHA_SIZE:
  2400 		attrib = GL_ACCUM_ALPHA_BITS;
  2401 		break;
  2402 	case SDL_GL_STEREO:
  2403 		attrib = GL_STEREO;
  2404 		break;
  2405 #else
  2406 	case SDL_GL_ACCUM_RED_SIZE:
  2407 	case SDL_GL_ACCUM_GREEN_SIZE:
  2408 	case SDL_GL_ACCUM_BLUE_SIZE:
  2409 	case SDL_GL_ACCUM_ALPHA_SIZE:
  2410 	case SDL_GL_STEREO:
  2411 		/* none of these are supported in OpenGL ES */
  2412 		*value = 0;
  2413 		return 0;
  2414 #endif
  2415 	case SDL_GL_MULTISAMPLEBUFFERS:
  2416 #ifndef SDL_VIDEO_OPENGL_ES
  2417 		attrib = GL_SAMPLE_BUFFERS_ARB;
  2418 #else
  2419 		attrib = GL_SAMPLE_BUFFERS;
  2420 #endif
  2421 		break;
  2422 	case SDL_GL_MULTISAMPLESAMPLES:
  2423 #ifndef SDL_VIDEO_OPENGL_ES
  2424 		attrib = GL_SAMPLES_ARB;
  2425 #else
  2426 		attrib = GL_SAMPLES;
  2427 #endif
  2428 		break;
  2429 	case SDL_GL_BUFFER_SIZE:
  2430 		{
  2431 			GLint           bits = 0;
  2432 			GLint           component;
  2433 
  2434 			/*
  2435 			 * there doesn't seem to be a single flag in OpenGL
  2436 			 * for this!
  2437 			 */
  2438 			glGetIntegervFunc(GL_RED_BITS, &component);
  2439 			bits += component;
  2440 			glGetIntegervFunc(GL_GREEN_BITS, &component);
  2441 			bits += component;
  2442 			glGetIntegervFunc(GL_BLUE_BITS, &component);
  2443 			bits += component;
  2444 			glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2445 			bits += component;
  2446 
  2447 			*value = bits;
  2448 			return 0;
  2449 		}
  2450 	case SDL_GL_ACCELERATED_VISUAL:
  2451 		{
  2452 			/* FIXME: How do we get this information? */
  2453 			*value = (_this->gl_config.accelerated != 0);
  2454 			return 0;
  2455 		}
  2456 	default:
  2457 		SDL_SetError("Unknown OpenGL attribute");
  2458 		return -1;
  2459 	}
  2460 
  2461 	glGetIntegervFunc(attrib, (GLint *) value);
  2462 	return 0;
  2463 #else
  2464 	SDL_Unsupported();
  2465 	return -1;
  2466 #endif				/* SDL_VIDEO_OPENGL */
  2467 }
  2468 
  2469 SDL_GLContext
  2470 SDL_GL_CreateContext(SDL_WindowID windowID)
  2471 {
  2472 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  2473 
  2474 	if (!window) {
  2475 		return NULL;
  2476 	}
  2477 	if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2478 		SDL_SetError("The specified window isn't an OpenGL window");
  2479 		return NULL;
  2480 	}
  2481 	return _this->GL_CreateContext(_this, window);
  2482 }
  2483 
  2484 int
  2485 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2486 {
  2487 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  2488 
  2489 	if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2490 		SDL_SetError("The specified window isn't an OpenGL window");
  2491 		return -1;
  2492 	}
  2493 	if (!context) {
  2494 		window = NULL;
  2495 	}
  2496 	return _this->GL_MakeCurrent(_this, window, context);
  2497 }
  2498 
  2499 int
  2500 SDL_GL_SetSwapInterval(int interval)
  2501 {
  2502 	if (!_this) {
  2503 		SDL_UninitializedVideo();
  2504 		return -1;
  2505 	}
  2506 	if (_this->GL_SetSwapInterval) {
  2507 		return _this->GL_SetSwapInterval(_this, interval);
  2508 	} else {
  2509 		SDL_SetError("Setting the swap interval is not supported");
  2510 		return -1;
  2511 	}
  2512 }
  2513 
  2514 int
  2515 SDL_GL_GetSwapInterval(void)
  2516 {
  2517 	if (!_this) {
  2518 		SDL_UninitializedVideo();
  2519 		return -1;
  2520 	}
  2521 	if (_this->GL_GetSwapInterval) {
  2522 		return _this->GL_GetSwapInterval(_this);
  2523 	} else {
  2524 		SDL_SetError("Getting the swap interval is not supported");
  2525 		return -1;
  2526 	}
  2527 }
  2528 
  2529 void
  2530 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2531 {
  2532 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  2533 
  2534 	if (!window) {
  2535 		return;
  2536 	}
  2537 	if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2538 		SDL_SetError("The specified window isn't an OpenGL window");
  2539 		return;
  2540 	}
  2541 	_this->GL_SwapWindow(_this, window);
  2542 }
  2543 
  2544 void
  2545 SDL_GL_DeleteContext(SDL_GLContext context)
  2546 {
  2547 	if (!_this || !context) {
  2548 		return;
  2549 	}
  2550 	_this->GL_MakeCurrent(_this, NULL, NULL);
  2551 	_this->GL_DeleteContext(_this, context);
  2552 }
  2553 
  2554 #if 0                           // FIXME
  2555 /*
  2556  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2557  * & 2 for alpha channel.
  2558  */
  2559 static void
  2560 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2561 {
  2562 	int             x, y;
  2563 	Uint32          colorkey;
  2564 #define SET_MASKBIT(icon, x, y, mask) \
  2565 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2566 
  2567 	colorkey = icon->format->colorkey;
  2568 	switch (icon->format->BytesPerPixel) {
  2569 	case 1:
  2570 		{
  2571 			Uint8          *pixels;
  2572 			for (y = 0; y < icon->h; ++y) {
  2573 				pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2574 				for (x = 0; x < icon->w; ++x) {
  2575 					if (*pixels++ == colorkey) {
  2576 						SET_MASKBIT(icon, x, y, mask);
  2577 					}
  2578 				}
  2579 			}
  2580 		}
  2581 		break;
  2582 
  2583 	case 2:
  2584 		{
  2585 			Uint16         *pixels;
  2586 			for (y = 0; y < icon->h; ++y) {
  2587 				pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2588 				for (x = 0; x < icon->w; ++x) {
  2589 					if ((flags & 1) && *pixels == colorkey) {
  2590 						SET_MASKBIT(icon, x, y, mask);
  2591 					} else if ((flags & 2)
  2592 						   && (*pixels & icon->format->Amask) == 0) {
  2593 						SET_MASKBIT(icon, x, y, mask);
  2594 					}
  2595 					pixels++;
  2596 				}
  2597 			}
  2598 		}
  2599 		break;
  2600 
  2601 	case 4:
  2602 		{
  2603 			Uint32         *pixels;
  2604 			for (y = 0; y < icon->h; ++y) {
  2605 				pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2606 				for (x = 0; x < icon->w; ++x) {
  2607 					if ((flags & 1) && *pixels == colorkey) {
  2608 						SET_MASKBIT(icon, x, y, mask);
  2609 					} else if ((flags & 2)
  2610 						   && (*pixels & icon->format->Amask) == 0) {
  2611 						SET_MASKBIT(icon, x, y, mask);
  2612 					}
  2613 					pixels++;
  2614 				}
  2615 			}
  2616 		}
  2617 		break;
  2618 	}
  2619 }
  2620 
  2621 /*
  2622  * Sets the window manager icon for the display window.
  2623  */
  2624 void
  2625 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2626 {
  2627 	if (icon && _this->SetIcon) {
  2628 		/* Generate a mask if necessary, and create the icon! */
  2629 		if (mask == NULL) {
  2630 			int             mask_len = icon->h * (icon->w + 7) / 8;
  2631 			int             flags = 0;
  2632 			mask = (Uint8 *) SDL_malloc(mask_len);
  2633 			if (mask == NULL) {
  2634 				return;
  2635 			}
  2636 			SDL_memset(mask, ~0, mask_len);
  2637 			if (icon->flags & SDL_SRCCOLORKEY)
  2638 				flags |= 1;
  2639 			if (icon->flags & SDL_SRCALPHA)
  2640 				flags |= 2;
  2641 			if (flags) {
  2642 				CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2643 			}
  2644 			_this->SetIcon(_this, icon, mask);
  2645 			SDL_free(mask);
  2646 		} else {
  2647 			_this->SetIcon(_this, icon, mask);
  2648 		}
  2649 	}
  2650 }
  2651 #endif
  2652 
  2653 SDL_bool
  2654 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo * info)
  2655 {
  2656 	SDL_Window     *window = SDL_GetWindowFromID(windowID);
  2657 
  2658 	if (!window || !_this->GetWindowWMInfo) {
  2659 		return SDL_FALSE;
  2660 	}
  2661 	return (_this->GetWindowWMInfo(_this, window, info));
  2662 }
  2663 
  2664 /* vi: set ts=4 sw=4 expandtab: */