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. */
quit(int rc)18 static void quit(int rc)
19 {
20 SDL_Quit();
21 exit(rc);
22 }
23
LoadIconSurface(char * file,Uint8 ** maskp)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
FilterEvents(const SDL_Event * event)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
HandleMouse(void * unused)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
HandleKeyboard(void * unused)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
main(int argc,char * argv[])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 }
339