test/threadwin.c
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FUNCTIONS
This source file includes following functions.
- LoadIconSurface
- FilterEvents
- HandleMouse
- HandleKeyboard
- main
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 SDL_Surface *LoadIconSurface(char *file, Uint8 **maskp)
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18 {
19 SDL_Surface *icon;
20 Uint8 *pixels;
21 Uint8 *mask;
22 int mlen, i;
23
24 *maskp = NULL;
25
26 /* Load the icon surface */
27 icon = SDL_LoadBMP(file);
28 if ( icon == NULL ) {
29 fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());
30 return(NULL);
31 }
32
33 /* Check width and height */
34 if ( (icon->w%8) != 0 ) {
35 fprintf(stderr, "Icon width must be a multiple of 8!\n");
36 SDL_FreeSurface(icon);
37 return(NULL);
38 }
39 if ( icon->format->palette == NULL ) {
40 fprintf(stderr, "Icon must have a palette!\n");
41 SDL_FreeSurface(icon);
42 return(NULL);
43 }
44
45 /* Set the colorkey */
46 SDL_SetColorKey(icon, SDL_SRCCOLORKEY, *((Uint8 *)icon->pixels));
47
48 /* Create the mask */
49 pixels = (Uint8 *)icon->pixels;
50 printf("Transparent pixel: (%d,%d,%d)\n",
51 icon->format->palette->colors[*pixels].r,
52 icon->format->palette->colors[*pixels].g,
53 icon->format->palette->colors[*pixels].b);
54 mlen = icon->w*icon->h;
55 mask = (Uint8 *)malloc(mlen/8);
56 if ( mask == NULL ) {
57 fprintf(stderr, "Out of memory!\n");
58 SDL_FreeSurface(icon);
59 return(NULL);
60 }
61 memset(mask, 0, mlen/8);
62 for ( i=0; i<mlen; ) {
63 if ( pixels[i] != *pixels )
64 mask[i/8] |= 0x01;
65 ++i;
66 if ( (i%8) != 0 )
67 mask[i/8] <<= 1;
68 }
69 *maskp = mask;
70 return(icon);
71 }
72
73 int FilterEvents(const SDL_Event *event)
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74 {
75 static int reallyquit = 0;
76
77 switch (event->type) {
78
79 case SDL_ACTIVEEVENT:
80 /* See what happened */
81 printf("App %s ",
82 event->active.gain ? "gained" : "lost");
83 if ( event->active.state & SDL_APPACTIVE )
84 printf("active ");
85 if ( event->active.state & SDL_APPMOUSEFOCUS )
86 printf("mouse ");
87 if ( event->active.state & SDL_APPINPUTFOCUS )
88 printf("input ");
89 printf("focus\n");
90
91 /* See if we are iconified or restored */
92 if ( event->active.state & SDL_APPACTIVE ) {
93 printf("App has been %s\n",
94 event->active.gain ?
95 "restored" : "iconified");
96 }
97 return(0);
98
99 /* This is important! Queue it if we want to quit. */
100 case SDL_QUIT:
101 if ( ! reallyquit ) {
102 reallyquit = 1;
103 printf("Quit requested\n");
104 return(0);
105 }
106 printf("Quit demanded\n");
107 return(1);
108
109 /* Mouse and keyboard events go to threads */
110 case SDL_MOUSEMOTION:
111 case SDL_MOUSEBUTTONDOWN:
112 case SDL_MOUSEBUTTONUP:
113 case SDL_KEYDOWN:
114 case SDL_KEYUP:
115 return(1);
116
117 /* Drop all other events */
118 default:
119 return(0);
120 }
121 }
122
123 int HandleMouse(void *unused)
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124 {
125 SDL_Event events[10];
126 int i, found;
127 Uint32 mask;
128
129 /* Handle mouse events here */
130 mask = (SDL_MOUSEMOTIONMASK|SDL_MOUSEBUTTONDOWNMASK|SDL_MOUSEBUTTONUPMASK);
131 while ( ! done ) {
132 found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask);
133 for ( i=0; i<found; ++i ) {
134 switch(events[i].type) {
135 /* We want to toggle visibility on buttonpress */
136 case SDL_MOUSEBUTTONDOWN:
137 case SDL_MOUSEBUTTONUP:
138 if ( events[i].button.state == SDL_PRESSED ) {
139 visible = !visible;
140 SDL_ShowCursor(visible);
141 }
142 printf("Mouse button %d has been %s\n",
143 events[i].button.button,
144 (events[i].button.state == SDL_PRESSED) ?
145 "pressed" : "released");
146 break;
147 /* Show relative mouse motion */
148 case SDL_MOUSEMOTION:
149 printf("Mouse relative motion: {%d,%d}\n",
150 events[i].motion.xrel, events[i].motion.yrel);
151 break;
152 }
153 }
154 /* Give up some CPU to allow events to arrive */
155 SDL_Delay(20);
156 }
157 return(0);
158 }
159
160 int HandleKeyboard(void *unused)
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161 {
162 SDL_Event events[10];
163 int i, found;
164 Uint32 mask;
165
166 /* Handle mouse events here */
167 mask = (SDL_KEYDOWNMASK|SDL_KEYUPMASK);
168 while ( ! done ) {
169 found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask);
170 for ( i=0; i<found; ++i ) {
171 switch(events[i].type) {
172 /* We want to toggle visibility on buttonpress */
173 case SDL_KEYDOWN:
174 case SDL_KEYUP:
175 /* Allow hitting <ESC> to quit the app */
176 if ( events[i].key.keysym.sym == SDLK_ESCAPE ) {
177 done = 1;
178 }
179 printf("Key '%c' has been %s\n",
180 events[i].key.keysym.unicode,
181 (events[i].key.state == SDL_PRESSED) ?
182 "pressed" : "released");
183 break;
184 }
185 }
186 /* Give up some CPU to allow events to arrive */
187 SDL_Delay(20);
188 }
189 return(0);
190 }
191
192 int main(int argc, char *argv[])
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193 {
194 SDL_Surface *screen;
195 SDL_Surface *icon;
196 Uint8 *icon_mask;
197 int i, parsed;
198 Uint8 *buffer;
199 SDL_Color palette[256];
200 Uint32 init_flags;
201 Uint8 video_bpp;
202 Uint32 video_flags;
203 SDL_Thread *mouse_thread;
204 SDL_Thread *keybd_thread;
205
206 /* Set the options, based on command line arguments */
207 init_flags = SDL_INIT_VIDEO;
208 video_bpp = 8;
209 video_flags = SDL_SWSURFACE;
210 parsed = 1;
211 while ( parsed ) {
212 /* If the threaded option is enabled, and the SDL library hasn't
213 been compiled with threaded events enabled, then the mouse and
214 keyboard won't respond.
215 */
216 if ( (argc >= 2) && (strcmp(argv[1], "-threaded") == 0) ) {
217 init_flags |= SDL_INIT_EVENTTHREAD;
218 argc -= 1;
219 argv += 1;
220 printf("Running with threaded events\n");
221 } else
222 if ( (argc >= 2) && (strcmp(argv[1], "-fullscreen") == 0) ) {
223 video_flags |= SDL_FULLSCREEN;
224 argc -= 1;
225 argv += 1;
226 } else
227 if ( (argc >= 3) && (strcmp(argv[1], "-bpp") == 0) ) {
228 video_bpp = atoi(argv[2]);
229 argc -= 2;
230 argv += 2;
231 } else {
232 parsed = 0;
233 }
234 }
235
236 /* Initialize SDL with the requested flags */
237 if ( SDL_Init(init_flags) < 0 ) {
238 fprintf(stderr,
239 "Couldn't initialize SDL: %s\n", SDL_GetError());
240 exit(1);
241 }
242 atexit(SDL_Quit);
243
244 /* Set the icon -- this must be done before the first mode set */
245 icon = LoadIconSurface("icon.bmp", &icon_mask);
246 if ( icon != NULL ) {
247 SDL_WM_SetIcon(icon, icon_mask);
248 }
249 if ( icon_mask != NULL )
250 free(icon_mask);
251
252 /* Initialize the display */
253 screen = SDL_SetVideoMode(640, 480, video_bpp, video_flags);
254 if ( screen == NULL ) {
255 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
256 video_bpp, SDL_GetError());
257 exit(1);
258 }
259 printf("Running in %s mode\n", screen->flags & SDL_FULLSCREEN ?
260 "fullscreen" : "windowed");
261
262 /* Enable printable characters */
263 SDL_EnableUNICODE(1);
264
265 /* Set an event filter that discards everything but QUIT */
266 SDL_SetEventFilter(FilterEvents);
267
268 /* Create the event handling threads */
269 mouse_thread = SDL_CreateThread(HandleMouse, NULL);
270 keybd_thread = SDL_CreateThread(HandleKeyboard, NULL);
271
272 /* Set the surface pixels and refresh! */
273 for ( i=0; i<256; ++i ) {
274 palette[i].r = 255-i;
275 palette[i].g = 255-i;
276 palette[i].b = 255-i;
277 }
278 SDL_SetColors(screen, palette, 0, 256);
279 if ( SDL_LockSurface(screen) < 0 ) {
280 fprintf(stderr, "Couldn't lock display surface: %s\n",
281 SDL_GetError());
282 exit(2);
283 }
284 buffer = (Uint8 *)screen->pixels;
285 for ( i=0; i<screen->h; ++i ) {
286 memset(buffer,(i*255)/screen->h,
287 screen->w*screen->format->BytesPerPixel);
288 buffer += screen->pitch;
289 }
290 SDL_UnlockSurface(screen);
291 SDL_UpdateRect(screen, 0, 0, 0, 0);
292
293 /* Loop, waiting for QUIT */
294 while ( ! done ) {
295 if ( ! (init_flags & SDL_INIT_EVENTTHREAD) ) {
296 SDL_PumpEvents(); /* Needed when event thread is off */
297 }
298 if ( SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_QUITMASK) ) {
299 done = 1;
300 }
301 /* Give up some CPU so the events can accumulate */
302 SDL_Delay(20);
303 }
304 SDL_WaitThread(mouse_thread, NULL);
305 SDL_WaitThread(keybd_thread, NULL);
306 return(0);
307 }