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? */
12static int done = 0;
13
14/* Is the cursor visible? */
15static int visible = 1;
16
17/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
18static void quit(int rc)
19{
20	SDL_Quit();
21	exit(rc);
22}
23
24SDL_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
80int 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
130int 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
167int 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
223int 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