1 

     2 /* Test out the multi-threaded event handling functions */

     3 

     4 #include <stdlib.h>

     5 #include <stdio.h>

     6 #include <string.h>

     7 

     8 #include "SDL.h"

     9 #include "SDL_thread.h"

    10 

    11 /* Are we done yet? */

    12 static int done = 0;

    13 

    14 /* Is the cursor visible? */

    15 static int visible = 1;

    16 

    17 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */

    18 static void quit(int rc)

    19 {

    20 	SDL_Quit();

    21 	exit(rc);

    22 }

    23 

    24 SDL_Surface *LoadIconSurface(char *file, Uint8 **maskp)

    25 {

    26 	SDL_Surface *icon;

    27 	Uint8       *pixels;

    28 	Uint8       *mask;

    29 	int          mlen, i;

    30 

    31 	*maskp = NULL;

    32 

    33 	/* Load the icon surface */

    34 	icon = SDL_LoadBMP(file);

    35 	if ( icon == NULL ) {

    36 		fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());

    37 		return(NULL);

    38 	}

    39 

    40 	/* Check width and height */

    41 	if ( (icon->w%8) != 0 ) {

    42 		fprintf(stderr, "Icon width must be a multiple of 8!\n");

    43 		SDL_FreeSurface(icon);

    44 		return(NULL);

    45 	}

    46 	if ( icon->format->palette == NULL ) {

    47 		fprintf(stderr, "Icon must have a palette!\n");

    48 		SDL_FreeSurface(icon);

    49 		return(NULL);

    50 	}

    51 

    52 	/* Set the colorkey */

    53 	SDL_SetColorKey(icon, SDL_SRCCOLORKEY, *((Uint8 *)icon->pixels));

    54 

    55 	/* Create the mask */

    56 	pixels = (Uint8 *)icon->pixels;

    57 	printf("Transparent pixel: (%d,%d,%d)\n",

    58 				icon->format->palette->colors[*pixels].r,

    59 				icon->format->palette->colors[*pixels].g,

    60 				icon->format->palette->colors[*pixels].b);

    61 	mlen = icon->w*icon->h;

    62 	mask = (Uint8 *)malloc(mlen/8);

    63 	if ( mask == NULL ) {

    64 		fprintf(stderr, "Out of memory!\n");

    65 		SDL_FreeSurface(icon);

    66 		return(NULL);

    67 	}

    68 	memset(mask, 0, mlen/8);

    69 	for ( i=0; i<mlen; ) {

    70 		if ( pixels[i] != *pixels )

    71 			mask[i/8] |= 0x01;

    72 		++i;

    73 		if ( (i%8) != 0 )

    74 			mask[i/8] <<= 1;

    75 	}

    76 	*maskp = mask;

    77 	return(icon);

    78 }

    79 

    80 int SDLCALL FilterEvents(const SDL_Event *event)

    81 {

    82 	static int reallyquit = 0;

    83 

    84 	switch (event->type) {

    85 

    86 		case SDL_ACTIVEEVENT:

    87 			/* See what happened */

    88 			printf("App %s ",

    89 				event->active.gain ? "gained" : "lost");

    90 			if ( event->active.state & SDL_APPACTIVE )

    91 				printf("active ");

    92 			if ( event->active.state & SDL_APPMOUSEFOCUS )

    93 				printf("mouse ");

    94 			if ( event->active.state & SDL_APPINPUTFOCUS )

    95 				printf("input ");

    96 			printf("focus\n");

    97 

    98 			/* See if we are iconified or restored */

    99 			if ( event->active.state & SDL_APPACTIVE ) {

   100 				printf("App has been %s\n",

   101 					event->active.gain ?

   102 						 "restored" : "iconified");

   103 			}

   104 			return(0);

   105 

   106 		/* This is important!  Queue it if we want to quit. */

   107 		case SDL_QUIT:

   108 			if ( ! reallyquit ) {

   109 				reallyquit = 1;

   110 				printf("Quit requested\n");

   111 				return(0);

   112 			}

   113 			printf("Quit demanded\n");

   114 			return(1);

   115 

   116 		/* Mouse and keyboard events go to threads */

   117 		case SDL_MOUSEMOTION:

   118 		case SDL_MOUSEBUTTONDOWN:

   119 		case SDL_MOUSEBUTTONUP:

   120 		case SDL_KEYDOWN:

   121 		case SDL_KEYUP:

   122 			return(1);

   123 

   124 		/* Drop all other events */

   125 		default:

   126 			return(0);

   127 	}

   128 }

   129 

   130 int SDLCALL HandleMouse(void *unused)

   131 {

   132 	SDL_Event events[10];

   133 	int i, found;

   134 	Uint32 mask;

   135 

   136 	/* Handle mouse events here */

   137 	mask = (SDL_MOUSEMOTIONMASK|SDL_MOUSEBUTTONDOWNMASK|SDL_MOUSEBUTTONUPMASK);

   138 	while ( ! done ) {

   139 		found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask);

   140 		for ( i=0; i<found; ++i ) {

   141 			switch(events[i].type) {

   142 				/* We want to toggle visibility on buttonpress */

   143 				case SDL_MOUSEBUTTONDOWN:

   144 				case SDL_MOUSEBUTTONUP:

   145 					if ( events[i].button.state == SDL_PRESSED ) {

   146 						visible = !visible;

   147 						SDL_ShowCursor(visible);

   148 					}

   149 					printf("Mouse button %d has been %s\n",

   150 						events[i].button.button,

   151 						(events[i].button.state == SDL_PRESSED) ?

   152 						"pressed" : "released");

   153 					break;

   154 				/* Show relative mouse motion */

   155 				case SDL_MOUSEMOTION:

   156 					printf("Mouse relative motion: {%d,%d}\n",

   157 							events[i].motion.xrel, events[i].motion.yrel);

   158 					break;

   159 			}

   160 		}

   161 		/* Give up some CPU to allow events to arrive */

   162 		SDL_Delay(20);

   163 	}

   164 	return(0);

   165 }

   166 

   167 int SDLCALL HandleKeyboard(void *unused)

   168 {

   169 	SDL_Event events[10];

   170 	int i, found;

   171 	Uint32 mask;

   172 

   173 	/* Handle mouse events here */

   174 	mask = (SDL_KEYDOWNMASK|SDL_KEYUPMASK);

   175 	while ( ! done ) {

   176 		found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask);

   177 		for ( i=0; i<found; ++i ) {

   178 			switch(events[i].type) {

   179 			    /* We want to toggle visibility on buttonpress */

   180 			    case SDL_KEYDOWN:

   181 			    case SDL_KEYUP:

   182 			    	printf("Key '%c' (keysym==%d) has been %s\n",

   183 						events[i].key.keysym.unicode,

   184 						(int) events[i].key.keysym.sym,

   185 					(events[i].key.state == SDL_PRESSED) ?

   186 						"pressed" : "released");

   187 

   188 			    	/* Allow hitting <ESC> to quit the app */

   189 			    	if ( events[i].key.keysym.sym == SDLK_ESCAPE ) {

   190 			    		done = 1;

   191 			    	}

   192 

   193 					/* skip events now that aren't KEYUPs... */

   194 					if (events[i].key.state == SDL_PRESSED)

   195 						break;

   196 

   197 			    	if ( events[i].key.keysym.sym == SDLK_f ) {

   198 						int rc = 0;

   199 						printf("attempting to toggle fullscreen...\n");

   200 						rc = SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());

   201                         printf("SDL_WM_ToggleFullScreen returned %d.\n", rc);

   202 			    	}

   203 

   204 			    	if ( events[i].key.keysym.sym == SDLK_g ) {

   205 						SDL_GrabMode m;

   206 						m = SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_ON ?

   207 								SDL_GRAB_OFF : SDL_GRAB_ON;

   208 						printf("attempting to toggle input grab to %s...\n",

   209                                 m == SDL_GRAB_ON ? "ON" : "OFF");

   210                         SDL_WM_GrabInput(m);

   211 						printf("attempt finished.\n");

   212 			    	}

   213 

   214 			    	break;

   215 			}

   216 		}

   217 		/* Give up some CPU to allow events to arrive */

   218 		SDL_Delay(20);

   219 	}

   220 	return(0);

   221 }

   222 

   223 int main(int argc, char *argv[])

   224 {

   225 	SDL_Surface *screen;

   226 	SDL_Surface *icon;

   227 	Uint8 *icon_mask;

   228 	int i, parsed;

   229 	Uint8 *buffer;

   230 	SDL_Color palette[256];

   231 	Uint32 init_flags;

   232 	Uint8  video_bpp;

   233 	Uint32 video_flags;

   234 	SDL_Thread *mouse_thread;

   235 	SDL_Thread *keybd_thread;

   236 

   237 	/* Set the options, based on command line arguments */

   238 	init_flags = SDL_INIT_VIDEO;

   239 	video_bpp = 8;

   240 	video_flags = SDL_SWSURFACE;

   241 	parsed = 1;

   242 	while ( parsed ) {

   243 		/* If the threaded option is enabled, and the SDL library hasn't

   244 		   been compiled with threaded events enabled, then the mouse and

   245 		   keyboard won't respond.

   246 		 */

   247 		if ( (argc >= 2) && (strcmp(argv[1], "-threaded") == 0) ) {

   248 			init_flags |= SDL_INIT_EVENTTHREAD;

   249 			argc -= 1;

   250 			argv += 1;

   251 			printf("Running with threaded events\n");

   252 		} else

   253 		if ( (argc >= 2) && (strcmp(argv[1], "-fullscreen") == 0) ) {

   254 			video_flags |= SDL_FULLSCREEN;

   255 			argc -= 1;

   256 			argv += 1;

   257 		} else

   258 		if ( (argc >= 3) && (strcmp(argv[1], "-bpp") == 0) ) {

   259 			video_bpp = atoi(argv[2]);

   260 			argc -= 2;

   261 			argv += 2;

   262 		} else {

   263 			parsed = 0;

   264 		}

   265 	}

   266 

   267 	/* Initialize SDL with the requested flags */

   268 	if ( SDL_Init(init_flags) < 0 ) {

   269 		fprintf(stderr,

   270 			"Couldn't initialize SDL: %s\n", SDL_GetError());

   271 		return(1);

   272 	}

   273 

   274 	/* Set the icon -- this must be done before the first mode set */

   275 	icon = LoadIconSurface("icon.bmp", &icon_mask);

   276 	if ( icon != NULL ) {

   277 		SDL_WM_SetIcon(icon, icon_mask);

   278 	}

   279 	if ( icon_mask != NULL )

   280 		free(icon_mask);

   281 

   282 	/* Initialize the display */

   283 	screen = SDL_SetVideoMode(640, 480, video_bpp, video_flags);

   284 	if (  screen == NULL ) {

   285 		fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",

   286 						video_bpp, SDL_GetError());

   287 		quit(1);

   288 	}

   289 	printf("Running in %s mode\n", screen->flags & SDL_FULLSCREEN ?

   290 						"fullscreen" : "windowed");

   291 

   292 	/* Enable printable characters */

   293 	SDL_EnableUNICODE(1);

   294 

   295 	/* Set an event filter that discards everything but QUIT */

   296 	SDL_SetEventFilter(FilterEvents);

   297 

   298 	/* Create the event handling threads */

   299 	mouse_thread = SDL_CreateThread(HandleMouse, NULL);

   300 	keybd_thread = SDL_CreateThread(HandleKeyboard, NULL);

   301 

   302 	/* Set the surface pixels and refresh! */

   303 	for ( i=0; i<256; ++i ) {

   304 		palette[i].r = 255-i;

   305 		palette[i].g = 255-i;

   306 		palette[i].b = 255-i;

   307 	}

   308 	SDL_SetColors(screen, palette, 0, 256);

   309 	if ( SDL_LockSurface(screen) < 0 ) {

   310 		fprintf(stderr, "Couldn't lock display surface: %s\n",

   311 							SDL_GetError());

   312 		quit(2);

   313 	}

   314 	buffer = (Uint8 *)screen->pixels;

   315 	for ( i=0; i<screen->h; ++i ) {

   316 		memset(buffer,(i*255)/screen->h,

   317 				screen->w*screen->format->BytesPerPixel);

   318 		buffer += screen->pitch;

   319 	}

   320 	SDL_UnlockSurface(screen);

   321 	SDL_UpdateRect(screen, 0, 0, 0, 0);

   322 

   323 	/* Loop, waiting for QUIT */

   324 	while ( ! done ) {

   325 		if ( ! (init_flags & SDL_INIT_EVENTTHREAD) ) {

   326 			SDL_PumpEvents(); /* Needed when event thread is off */

   327 		}

   328 		if ( SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_QUITMASK) ) {

   329 			done = 1;

   330 		}

   331 		/* Give up some CPU so the events can accumulate */

   332 		SDL_Delay(20);

   333 	}

   334 	SDL_WaitThread(mouse_thread, NULL);

   335 	SDL_WaitThread(keybd_thread, NULL);

   336 	SDL_Quit();

   337 	return(0);

   338 }