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comparison test/testalpha.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents 67fc81efcfc3
children c785543d1843
comparison
equal deleted inserted replaced
1894:c69cee13dd76 1895:c121d94672cb
8 #include <string.h> 8 #include <string.h>
9 #include <math.h> 9 #include <math.h>
10 10
11 #include "SDL.h" 11 #include "SDL.h"
12 12
13 #define FRAME_TICKS (1000/30) /* 30 frames/second */ 13 #define FRAME_TICKS (1000/30) /* 30 frames/second */
14 14
15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ 15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
16 static void quit(int rc) 16 static void
17 { 17 quit(int rc)
18 SDL_Quit(); 18 {
19 exit(rc); 19 SDL_Quit();
20 exit(rc);
20 } 21 }
21 22
22 /* Fill the screen with a gradient */ 23 /* Fill the screen with a gradient */
23 static void FillBackground(SDL_Surface *screen) 24 static void
24 { 25 FillBackground(SDL_Surface * screen)
25 Uint8 *buffer; 26 {
26 Uint16 *buffer16; 27 Uint8 *buffer;
27 Uint16 color; 28 Uint16 *buffer16;
28 Uint8 gradient; 29 Uint16 color;
29 int i, k; 30 Uint8 gradient;
30 31 int i, k;
31 /* Set the surface pixels and refresh! */ 32
32 if ( SDL_LockSurface(screen) < 0 ) { 33 /* Set the surface pixels and refresh! */
33 fprintf(stderr, "Couldn't lock the display surface: %s\n", 34 if (SDL_LockSurface(screen) < 0) {
34 SDL_GetError()); 35 fprintf(stderr, "Couldn't lock the display surface: %s\n",
35 quit(2); 36 SDL_GetError());
36 } 37 quit(2);
37 buffer=(Uint8 *)screen->pixels; 38 }
38 if (screen->format->BytesPerPixel!=2) { 39 buffer = (Uint8 *) screen->pixels;
39 for ( i=0; i<screen->h; ++i ) { 40 if (screen->format->BytesPerPixel != 2) {
40 memset(buffer,(i*255)/screen->h, screen->w*screen->format->BytesPerPixel); 41 for (i = 0; i < screen->h; ++i) {
41 buffer += screen->pitch; 42 memset(buffer, (i * 255) / screen->h,
42 } 43 screen->w * screen->format->BytesPerPixel);
43 } 44 buffer += screen->pitch;
44 else 45 }
45 { 46 } else {
46 for ( i=0; i<screen->h; ++i ) { 47 for (i = 0; i < screen->h; ++i) {
47 gradient=((i*255)/screen->h); 48 gradient = ((i * 255) / screen->h);
48 color = (Uint16)SDL_MapRGB(screen->format, gradient, gradient, gradient); 49 color =
49 buffer16=(Uint16*)buffer; 50 (Uint16) SDL_MapRGB(screen->format, gradient, gradient,
50 for (k=0; k<screen->w; k++) 51 gradient);
51 { 52 buffer16 = (Uint16 *) buffer;
52 *(buffer16+k)=color; 53 for (k = 0; k < screen->w; k++) {
53 } 54 *(buffer16 + k) = color;
54 buffer += screen->pitch; 55 }
55 } 56 buffer += screen->pitch;
56 } 57 }
57 58 }
58 SDL_UnlockSurface(screen); 59
59 SDL_UpdateRect(screen, 0, 0, 0, 0); 60 SDL_UnlockSurface(screen);
61 SDL_UpdateRect(screen, 0, 0, 0, 0);
60 } 62 }
61 63
62 /* Create a "light" -- a yellowish surface with variable alpha */ 64 /* Create a "light" -- a yellowish surface with variable alpha */
63 SDL_Surface *CreateLight(int radius) 65 SDL_Surface *
64 { 66 CreateLight(int radius)
65 Uint8 trans, alphamask; 67 {
66 int range, addition; 68 Uint8 trans, alphamask;
67 int xdist, ydist; 69 int range, addition;
68 Uint16 x, y; 70 int xdist, ydist;
69 Uint16 skip; 71 Uint16 x, y;
70 Uint32 pixel; 72 Uint16 skip;
71 SDL_Surface *light; 73 Uint32 pixel;
74 SDL_Surface *light;
72 75
73 #ifdef LIGHT_16BIT 76 #ifdef LIGHT_16BIT
74 Uint16 *buf; 77 Uint16 *buf;
75 78
76 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */ 79 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
77 /* Note: this isn't any faster than a 32 bit alpha surface */ 80 /* Note: this isn't any faster than a 32 bit alpha surface */
78 alphamask = 0x0000000F; 81 alphamask = 0x0000000F;
79 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16, 82 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 16,
80 0x0000F000, 0x00000F00, 0x000000F0, alphamask); 83 0x0000F000, 0x00000F00, 0x000000F0,
84 alphamask);
81 #else 85 #else
82 Uint32 *buf; 86 Uint32 *buf;
83 87
84 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */ 88 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
85 alphamask = 0x000000FF; 89 alphamask = 0x000000FF;
86 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32, 90 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 32,
87 0xFF000000, 0x00FF0000, 0x0000FF00, alphamask); 91 0xFF000000, 0x00FF0000, 0x0000FF00,
88 if ( light == NULL ) { 92 alphamask);
89 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError()); 93 if (light == NULL) {
90 return(NULL); 94 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError());
91 } 95 return (NULL);
96 }
92 #endif 97 #endif
93 98
94 /* Fill with a light yellow-orange color */ 99 /* Fill with a light yellow-orange color */
95 skip = light->pitch-(light->w*light->format->BytesPerPixel); 100 skip = light->pitch - (light->w * light->format->BytesPerPixel);
96 #ifdef LIGHT_16BIT 101 #ifdef LIGHT_16BIT
97 buf = (Uint16 *)light->pixels; 102 buf = (Uint16 *) light->pixels;
98 #else 103 #else
99 buf = (Uint32 *)light->pixels; 104 buf = (Uint32 *) light->pixels;
100 #endif 105 #endif
101 /* Get a tranparent pixel value - we'll add alpha later */ 106 /* Get a tranparent pixel value - we'll add alpha later */
102 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0); 107 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0);
103 for ( y=0; y<light->h; ++y ) { 108 for (y = 0; y < light->h; ++y) {
104 for ( x=0; x<light->w; ++x ) { 109 for (x = 0; x < light->w; ++x) {
105 *buf++ = pixel; 110 *buf++ = pixel;
106 } 111 }
107 buf += skip; /* Almost always 0, but just in case... */ 112 buf += skip; /* Almost always 0, but just in case... */
108 } 113 }
109 114
110 /* Calculate alpha values for the surface. */ 115 /* Calculate alpha values for the surface. */
111 #ifdef LIGHT_16BIT 116 #ifdef LIGHT_16BIT
112 buf = (Uint16 *)light->pixels; 117 buf = (Uint16 *) light->pixels;
113 #else 118 #else
114 buf = (Uint32 *)light->pixels; 119 buf = (Uint32 *) light->pixels;
115 #endif 120 #endif
116 for ( y=0; y<light->h; ++y ) { 121 for (y = 0; y < light->h; ++y) {
117 for ( x=0; x<light->w; ++x ) { 122 for (x = 0; x < light->w; ++x) {
118 /* Slow distance formula (from center of light) */ 123 /* Slow distance formula (from center of light) */
119 xdist = x-(light->w/2); 124 xdist = x - (light->w / 2);
120 ydist = y-(light->h/2); 125 ydist = y - (light->h / 2);
121 range = (int)sqrt(xdist*xdist+ydist*ydist); 126 range = (int) sqrt(xdist * xdist + ydist * ydist);
122 127
123 /* Scale distance to range of transparency (0-255) */ 128 /* Scale distance to range of transparency (0-255) */
124 if ( range > radius ) { 129 if (range > radius) {
125 trans = alphamask; 130 trans = alphamask;
126 } else { 131 } else {
127 /* Increasing transparency with distance */ 132 /* Increasing transparency with distance */
128 trans = (Uint8)((range*alphamask)/radius); 133 trans = (Uint8) ((range * alphamask) / radius);
129 134
130 /* Lights are very transparent */ 135 /* Lights are very transparent */
131 addition = (alphamask+1)/8; 136 addition = (alphamask + 1) / 8;
132 if ( (int)trans+addition > alphamask ) { 137 if ((int) trans + addition > alphamask) {
133 trans = alphamask; 138 trans = alphamask;
134 } else { 139 } else {
135 trans += addition; 140 trans += addition;
136 } 141 }
137 } 142 }
138 /* We set the alpha component as the right N bits */ 143 /* We set the alpha component as the right N bits */
139 *buf++ |= (255-trans); 144 *buf++ |= (255 - trans);
140 } 145 }
141 buf += skip; /* Almost always 0, but just in case... */ 146 buf += skip; /* Almost always 0, but just in case... */
142 } 147 }
143 /* Enable RLE acceleration of this alpha surface */ 148 /* Enable RLE acceleration of this alpha surface */
144 SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0); 149 SDL_SetAlpha(light, SDL_SRCALPHA | SDL_RLEACCEL, 0);
145 150
146 /* We're done! */ 151 /* We're done! */
147 return(light); 152 return (light);
148 } 153 }
149 154
150 static Uint32 flashes = 0; 155 static Uint32 flashes = 0;
151 static Uint32 flashtime = 0; 156 static Uint32 flashtime = 0;
152 157
153 void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y) 158 void
154 { 159 FlashLight(SDL_Surface * screen, SDL_Surface * light, int x, int y)
155 SDL_Rect position; 160 {
156 Uint32 ticks1; 161 SDL_Rect position;
157 Uint32 ticks2; 162 Uint32 ticks1;
158 163 Uint32 ticks2;
159 /* Easy, center light */ 164
160 position.x = x-(light->w/2); 165 /* Easy, center light */
161 position.y = y-(light->h/2); 166 position.x = x - (light->w / 2);
162 position.w = light->w; 167 position.y = y - (light->h / 2);
163 position.h = light->h; 168 position.w = light->w;
164 ticks1 = SDL_GetTicks(); 169 position.h = light->h;
165 SDL_BlitSurface(light, NULL, screen, &position); 170 ticks1 = SDL_GetTicks();
166 ticks2 = SDL_GetTicks(); 171 SDL_BlitSurface(light, NULL, screen, &position);
167 SDL_UpdateRects(screen, 1, &position); 172 ticks2 = SDL_GetTicks();
168 ++flashes; 173 SDL_UpdateRects(screen, 1, &position);
169 174 ++flashes;
170 /* Update time spend doing alpha blitting */ 175
171 flashtime += (ticks2-ticks1); 176 /* Update time spend doing alpha blitting */
177 flashtime += (ticks2 - ticks1);
172 } 178 }
173 179
174 static int sprite_visible = 0; 180 static int sprite_visible = 0;
175 static SDL_Surface *sprite; 181 static SDL_Surface *sprite;
176 static SDL_Surface *backing; 182 static SDL_Surface *backing;
177 static SDL_Rect position; 183 static SDL_Rect position;
178 static int x_vel, y_vel; 184 static int x_vel, y_vel;
179 static int alpha_vel; 185 static int alpha_vel;
180 186
181 int LoadSprite(SDL_Surface *screen, char *file) 187 int
182 { 188 LoadSprite(SDL_Surface * screen, char *file)
183 SDL_Surface *converted; 189 {
184 190 SDL_Surface *converted;
185 /* Load the sprite image */ 191
186 sprite = SDL_LoadBMP(file); 192 /* Load the sprite image */
187 if ( sprite == NULL ) { 193 sprite = SDL_LoadBMP(file);
188 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); 194 if (sprite == NULL) {
189 return(-1); 195 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
190 } 196 return (-1);
191 197 }
192 /* Set transparent pixel as the pixel at (0,0) */ 198
193 if ( sprite->format->palette ) { 199 /* Set transparent pixel as the pixel at (0,0) */
194 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, 200 if (sprite->format->palette) {
195 *(Uint8 *)sprite->pixels); 201 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, *(Uint8 *) sprite->pixels);
196 } 202 }
197 203
198 /* Convert sprite to video format */ 204 /* Convert sprite to video format */
199 converted = SDL_DisplayFormat(sprite); 205 converted = SDL_DisplayFormat(sprite);
200 SDL_FreeSurface(sprite); 206 SDL_FreeSurface(sprite);
201 if ( converted == NULL ) { 207 if (converted == NULL) {
202 fprintf(stderr, "Couldn't convert background: %s\n", 208 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
203 SDL_GetError()); 209 return (-1);
204 return(-1); 210 }
205 } 211 sprite = converted;
206 sprite = converted; 212
207 213 /* Create the background */
208 /* Create the background */ 214 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8,
209 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8, 215 0, 0, 0, 0);
210 0, 0, 0, 0); 216 if (backing == NULL) {
211 if ( backing == NULL ) { 217 fprintf(stderr, "Couldn't create background: %s\n", SDL_GetError());
212 fprintf(stderr, "Couldn't create background: %s\n", 218 SDL_FreeSurface(sprite);
213 SDL_GetError()); 219 return (-1);
214 SDL_FreeSurface(sprite); 220 }
215 return(-1); 221
216 } 222 /* Convert background to video format */
217 223 converted = SDL_DisplayFormat(backing);
218 /* Convert background to video format */ 224 SDL_FreeSurface(backing);
219 converted = SDL_DisplayFormat(backing); 225 if (converted == NULL) {
220 SDL_FreeSurface(backing); 226 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
221 if ( converted == NULL ) { 227 SDL_FreeSurface(sprite);
222 fprintf(stderr, "Couldn't convert background: %s\n", 228 return (-1);
223 SDL_GetError()); 229 }
224 SDL_FreeSurface(sprite); 230 backing = converted;
225 return(-1); 231
226 } 232 /* Set the initial position of the sprite */
227 backing = converted; 233 position.x = (screen->w - sprite->w) / 2;
228 234 position.y = (screen->h - sprite->h) / 2;
229 /* Set the initial position of the sprite */ 235 position.w = sprite->w;
230 position.x = (screen->w-sprite->w)/2; 236 position.h = sprite->h;
231 position.y = (screen->h-sprite->h)/2; 237 x_vel = 0;
232 position.w = sprite->w; 238 y_vel = 0;
233 position.h = sprite->h; 239 alpha_vel = 1;
234 x_vel = 0; y_vel = 0; 240
235 alpha_vel = 1; 241 /* We're ready to roll. :) */
236 242 return (0);
237 /* We're ready to roll. :) */ 243 }
238 return(0); 244
239 } 245 void
240 246 AttractSprite(Uint16 x, Uint16 y)
241 void AttractSprite(Uint16 x, Uint16 y) 247 {
242 { 248 x_vel = ((int) x - position.x) / 10;
243 x_vel = ((int)x-position.x)/10; 249 y_vel = ((int) y - position.y) / 10;
244 y_vel = ((int)y-position.y)/10; 250 }
245 } 251
246 252 void
247 void MoveSprite(SDL_Surface *screen, SDL_Surface *light) 253 MoveSprite(SDL_Surface * screen, SDL_Surface * light)
248 { 254 {
249 SDL_Rect updates[2]; 255 SDL_Rect updates[2];
250 int alpha; 256 int alpha;
251 257
252 /* Erase the sprite if it was visible */ 258 /* Erase the sprite if it was visible */
253 if ( sprite_visible ) { 259 if (sprite_visible) {
254 updates[0] = position; 260 updates[0] = position;
255 SDL_BlitSurface(backing, NULL, screen, &updates[0]); 261 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
256 } else { 262 } else {
257 updates[0].x = 0; updates[0].y = 0; 263 updates[0].x = 0;
258 updates[0].w = 0; updates[0].h = 0; 264 updates[0].y = 0;
259 sprite_visible = 1; 265 updates[0].w = 0;
260 } 266 updates[0].h = 0;
261 267 sprite_visible = 1;
262 /* Since the sprite is off the screen, we can do other drawing 268 }
263 without being overwritten by the saved area behind the sprite. 269
264 */ 270 /* Since the sprite is off the screen, we can do other drawing
265 if ( light != NULL ) { 271 without being overwritten by the saved area behind the sprite.
266 int x, y; 272 */
267 273 if (light != NULL) {
268 SDL_GetMouseState(&x, &y); 274 int x, y;
269 FlashLight(screen, light, x, y); 275
270 } 276 SDL_GetMouseState(&x, &y);
271 277 FlashLight(screen, light, x, y);
272 /* Move the sprite, bounce at the wall */ 278 }
273 position.x += x_vel; 279
274 if ( (position.x < 0) || (position.x >= screen->w) ) { 280 /* Move the sprite, bounce at the wall */
275 x_vel = -x_vel; 281 position.x += x_vel;
276 position.x += x_vel; 282 if ((position.x < 0) || (position.x >= screen->w)) {
277 } 283 x_vel = -x_vel;
278 position.y += y_vel; 284 position.x += x_vel;
279 if ( (position.y < 0) || (position.y >= screen->h) ) { 285 }
280 y_vel = -y_vel; 286 position.y += y_vel;
281 position.y += y_vel; 287 if ((position.y < 0) || (position.y >= screen->h)) {
282 } 288 y_vel = -y_vel;
283 289 position.y += y_vel;
284 /* Update transparency (fade in and out) */ 290 }
285 alpha = sprite->format->alpha; 291
286 if ( (alpha+alpha_vel) < 0 ) { 292 /* Update transparency (fade in and out) */
287 alpha_vel = -alpha_vel; 293 alpha = sprite->format->alpha;
288 } else 294 if ((alpha + alpha_vel) < 0) {
289 if ( (alpha+alpha_vel) > 255 ) { 295 alpha_vel = -alpha_vel;
290 alpha_vel = -alpha_vel; 296 } else if ((alpha + alpha_vel) > 255) {
291 } 297 alpha_vel = -alpha_vel;
292 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel)); 298 }
293 299 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8) (alpha + alpha_vel));
294 /* Save the area behind the sprite */ 300
295 updates[1] = position; 301 /* Save the area behind the sprite */
296 SDL_BlitSurface(screen, &updates[1], backing, NULL); 302 updates[1] = position;
297 303 SDL_BlitSurface(screen, &updates[1], backing, NULL);
298 /* Blit the sprite onto the screen */ 304
299 updates[1] = position; 305 /* Blit the sprite onto the screen */
300 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); 306 updates[1] = position;
301 307 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
302 /* Make it so! */ 308
303 SDL_UpdateRects(screen, 2, updates); 309 /* Make it so! */
304 } 310 SDL_UpdateRects(screen, 2, updates);
305 311 }
306 void WarpSprite(SDL_Surface *screen, int x, int y) 312
307 { 313 void
308 SDL_Rect updates[2]; 314 WarpSprite(SDL_Surface * screen, int x, int y)
309 315 {
310 /* Erase, move, Draw, update */ 316 SDL_Rect updates[2];
311 updates[0] = position; 317
312 SDL_BlitSurface(backing, NULL, screen, &updates[0]); 318 /* Erase, move, Draw, update */
313 position.x = x-sprite->w/2; /* Center about X */ 319 updates[0] = position;
314 position.y = y-sprite->h/2; /* Center about Y */ 320 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
315 updates[1] = position; 321 position.x = x - sprite->w / 2; /* Center about X */
316 SDL_BlitSurface(screen, &updates[1], backing, NULL); 322 position.y = y - sprite->h / 2; /* Center about Y */
317 updates[1] = position; 323 updates[1] = position;
318 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); 324 SDL_BlitSurface(screen, &updates[1], backing, NULL);
319 SDL_UpdateRects(screen, 2, updates); 325 updates[1] = position;
320 } 326 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
321 327 SDL_UpdateRects(screen, 2, updates);
322 int main(int argc, char *argv[]) 328 }
323 { 329
324 const SDL_VideoInfo *info; 330 int
325 SDL_Surface *screen; 331 main(int argc, char *argv[])
326 int w, h; 332 {
327 Uint8 video_bpp; 333 const SDL_VideoInfo *info;
328 Uint32 videoflags; 334 SDL_Surface *screen;
329 int i, done; 335 int w, h;
330 SDL_Event event; 336 Uint8 video_bpp;
331 SDL_Surface *light; 337 Uint32 videoflags;
332 int mouse_pressed; 338 int i, done;
333 Uint32 ticks, lastticks; 339 SDL_Event event;
334 340 SDL_Surface *light;
335 341 int mouse_pressed;
336 /* Initialize SDL */ 342 Uint32 ticks, lastticks;
337 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { 343
338 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); 344
339 return(1); 345 /* Initialize SDL */
340 } 346 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
341 347 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
342 /* Alpha blending doesn't work well at 8-bit color */ 348 return (1);
349 }
350
351 /* Alpha blending doesn't work well at 8-bit color */
343 #ifdef _WIN32_WCE 352 #ifdef _WIN32_WCE
344 /* Pocket PC */ 353 /* Pocket PC */
345 w = 240; 354 w = 240;
346 h = 320; 355 h = 320;
347 #else 356 #else
348 w = 640; 357 w = 640;
349 h = 480; 358 h = 480;
350 #endif 359 #endif
351 info = SDL_GetVideoInfo(); 360 info = SDL_GetVideoInfo();
352 if ( info->vfmt->BitsPerPixel > 8 ) { 361 if (info->vfmt->BitsPerPixel > 8) {
353 video_bpp = info->vfmt->BitsPerPixel; 362 video_bpp = info->vfmt->BitsPerPixel;
354 } else { 363 } else {
355 video_bpp = 16; 364 video_bpp = 16;
365 fprintf(stderr, "forced 16 bpp mode\n");
366 }
367 videoflags = SDL_SWSURFACE;
368 for (i = 1; argv[i]; ++i) {
369 if (strcmp(argv[i], "-bpp") == 0) {
370 video_bpp = atoi(argv[++i]);
371 if (video_bpp <= 8) {
372 video_bpp = 16;
356 fprintf(stderr, "forced 16 bpp mode\n"); 373 fprintf(stderr, "forced 16 bpp mode\n");
357 } 374 }
358 videoflags = SDL_SWSURFACE; 375 } else if (strcmp(argv[i], "-hw") == 0) {
359 for ( i = 1; argv[i]; ++i ) { 376 videoflags |= SDL_HWSURFACE;
360 if ( strcmp(argv[i], "-bpp") == 0 ) { 377 } else if (strcmp(argv[i], "-warp") == 0) {
361 video_bpp = atoi(argv[++i]); 378 videoflags |= SDL_HWPALETTE;
362 if (video_bpp<=8) { 379 } else if (strcmp(argv[i], "-width") == 0 && argv[i + 1]) {
363 video_bpp=16; 380 w = atoi(argv[++i]);
364 fprintf(stderr, "forced 16 bpp mode\n"); 381 } else if (strcmp(argv[i], "-height") == 0 && argv[i + 1]) {
365 } 382 h = atoi(argv[++i]);
366 } else 383 } else if (strcmp(argv[i], "-resize") == 0) {
367 if ( strcmp(argv[i], "-hw") == 0 ) { 384 videoflags |= SDL_RESIZABLE;
368 videoflags |= SDL_HWSURFACE; 385 } else if (strcmp(argv[i], "-noframe") == 0) {
369 } else 386 videoflags |= SDL_NOFRAME;
370 if ( strcmp(argv[i], "-warp") == 0 ) { 387 } else if (strcmp(argv[i], "-fullscreen") == 0) {
371 videoflags |= SDL_HWPALETTE; 388 videoflags |= SDL_FULLSCREEN;
372 } else 389 } else {
373 if ( strcmp(argv[i], "-width") == 0 && argv[i+1] ) { 390 fprintf(stderr,
374 w = atoi(argv[++i]); 391 "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n",
375 } else 392 argv[0]);
376 if ( strcmp(argv[i], "-height") == 0 && argv[i+1] ) { 393 quit(1);
377 h = atoi(argv[++i]); 394 }
378 } else 395 }
379 if ( strcmp(argv[i], "-resize") == 0 ) { 396
380 videoflags |= SDL_RESIZABLE; 397 /* Set video mode */
381 } else 398 if ((screen = SDL_SetVideoMode(w, h, video_bpp, videoflags)) == NULL) {
382 if ( strcmp(argv[i], "-noframe") == 0 ) { 399 fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n",
383 videoflags |= SDL_NOFRAME; 400 w, h, video_bpp, SDL_GetError());
384 } else 401 quit(2);
385 if ( strcmp(argv[i], "-fullscreen") == 0 ) { 402 }
386 videoflags |= SDL_FULLSCREEN; 403 FillBackground(screen);
387 } else { 404
388 fprintf(stderr, 405 /* Create the light */
389 "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n", 406 light = CreateLight(82);
390 argv[0]); 407 if (light == NULL) {
391 quit(1); 408 quit(1);
392 } 409 }
393 } 410
394 411 /* Load the sprite */
395 /* Set video mode */ 412 if (LoadSprite(screen, "icon.bmp") < 0) {
396 if ( (screen=SDL_SetVideoMode(w,h,video_bpp,videoflags)) == NULL ) { 413 SDL_FreeSurface(light);
397 fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n", 414 quit(1);
398 w, h, video_bpp, SDL_GetError()); 415 }
399 quit(2); 416
400 } 417 /* Print out information about our surfaces */
401 FillBackground(screen); 418 printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
402 419 if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
403 /* Create the light */ 420 printf("Screen is in video memory\n");
404 light = CreateLight(82); 421 } else {
405 if ( light == NULL ) { 422 printf("Screen is in system memory\n");
406 quit(1); 423 }
407 } 424 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
408 425 printf("Screen has double-buffering enabled\n");
409 /* Load the sprite */ 426 }
410 if ( LoadSprite(screen, "icon.bmp") < 0 ) { 427 if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
411 SDL_FreeSurface(light); 428 printf("Sprite is in video memory\n");
412 quit(1); 429 } else {
413 } 430 printf("Sprite is in system memory\n");
414 431 }
415 /* Print out information about our surfaces */ 432
416 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); 433 /* Run a sample blit to trigger blit acceleration */
417 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { 434 MoveSprite(screen, NULL);
418 printf("Screen is in video memory\n"); 435 if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
419 } else { 436 printf("Sprite blit uses hardware alpha acceleration\n");
420 printf("Screen is in system memory\n"); 437 } else {
421 } 438 printf("Sprite blit dosn't uses hardware alpha acceleration\n");
422 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { 439 }
423 printf("Screen has double-buffering enabled\n"); 440
424 } 441 /* Set a clipping rectangle to clip the outside edge of the screen */
425 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { 442 {
426 printf("Sprite is in video memory\n"); 443 SDL_Rect clip;
427 } else { 444 clip.x = 32;
428 printf("Sprite is in system memory\n"); 445 clip.y = 32;
429 } 446 clip.w = screen->w - (2 * 32);
430 447 clip.h = screen->h - (2 * 32);
431 /* Run a sample blit to trigger blit acceleration */ 448 SDL_SetClipRect(screen, &clip);
432 MoveSprite(screen, NULL); 449 }
433 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { 450
434 printf("Sprite blit uses hardware alpha acceleration\n"); 451 /* Wait for a keystroke */
435 } else { 452 lastticks = SDL_GetTicks();
436 printf("Sprite blit dosn't uses hardware alpha acceleration\n"); 453 done = 0;
437 } 454 mouse_pressed = 0;
438 455 while (!done) {
439 /* Set a clipping rectangle to clip the outside edge of the screen */ 456 /* Update the frame -- move the sprite */
440 { SDL_Rect clip; 457 if (mouse_pressed) {
441 clip.x = 32; 458 MoveSprite(screen, light);
442 clip.y = 32; 459 mouse_pressed = 0;
443 clip.w = screen->w-(2*32); 460 } else {
444 clip.h = screen->h-(2*32); 461 MoveSprite(screen, NULL);
445 SDL_SetClipRect(screen, &clip); 462 }
446 } 463
447 464 /* Slow down the loop to 30 frames/second */
448 /* Wait for a keystroke */ 465 ticks = SDL_GetTicks();
449 lastticks = SDL_GetTicks(); 466 if ((ticks - lastticks) < FRAME_TICKS) {
450 done = 0;
451 mouse_pressed = 0;
452 while ( !done ) {
453 /* Update the frame -- move the sprite */
454 if ( mouse_pressed ) {
455 MoveSprite(screen, light);
456 mouse_pressed = 0;
457 } else {
458 MoveSprite(screen, NULL);
459 }
460
461 /* Slow down the loop to 30 frames/second */
462 ticks = SDL_GetTicks();
463 if ( (ticks-lastticks) < FRAME_TICKS ) {
464 #ifdef CHECK_SLEEP_GRANULARITY 467 #ifdef CHECK_SLEEP_GRANULARITY
465 fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks)); 468 fprintf(stderr, "Sleeping %d ticks\n",
469 FRAME_TICKS - (ticks - lastticks));
466 #endif 470 #endif
467 SDL_Delay(FRAME_TICKS-(ticks-lastticks)); 471 SDL_Delay(FRAME_TICKS - (ticks - lastticks));
468 #ifdef CHECK_SLEEP_GRANULARITY 472 #ifdef CHECK_SLEEP_GRANULARITY
469 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks)); 473 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks() - ticks));
470 #endif 474 #endif
471 } 475 }
472 lastticks = ticks; 476 lastticks = ticks;
473 477
474 /* Check for events */ 478 /* Check for events */
475 while ( SDL_PollEvent(&event) ) { 479 while (SDL_PollEvent(&event)) {
476 switch (event.type) { 480 switch (event.type) {
477 case SDL_VIDEORESIZE: 481 case SDL_VIDEORESIZE:
478 screen = SDL_SetVideoMode(event.resize.w, event.resize.h, video_bpp, videoflags); 482 screen =
479 if ( screen ) { 483 SDL_SetVideoMode(event.resize.w, event.resize.h,
480 FillBackground(screen); 484 video_bpp, videoflags);
481 } 485 if (screen) {
482 break; 486 FillBackground(screen);
483 /* Attract sprite while mouse is held down */ 487 }
484 case SDL_MOUSEMOTION: 488 break;
485 if (event.motion.state != 0) { 489 /* Attract sprite while mouse is held down */
486 AttractSprite(event.motion.x, 490 case SDL_MOUSEMOTION:
487 event.motion.y); 491 if (event.motion.state != 0) {
488 mouse_pressed = 1; 492 AttractSprite(event.motion.x, event.motion.y);
489 } 493 mouse_pressed = 1;
490 break; 494 }
491 case SDL_MOUSEBUTTONDOWN: 495 break;
492 if ( event.button.button == 1 ) { 496 case SDL_MOUSEBUTTONDOWN:
493 AttractSprite(event.button.x, 497 if (event.button.button == 1) {
494 event.button.y); 498 AttractSprite(event.button.x, event.button.y);
495 mouse_pressed = 1; 499 mouse_pressed = 1;
496 } else { 500 } else {
497 SDL_Rect area; 501 SDL_Rect area;
498 502
499 area.x = event.button.x-16; 503 area.x = event.button.x - 16;
500 area.y = event.button.y-16; 504 area.y = event.button.y - 16;
501 area.w = 32; 505 area.w = 32;
502 area.h = 32; 506 area.h = 32;
503 SDL_FillRect(screen, &area, 0); 507 SDL_FillRect(screen, &area, 0);
504 SDL_UpdateRects(screen,1,&area); 508 SDL_UpdateRects(screen, 1, &area);
505 } 509 }
506 break; 510 break;
507 case SDL_KEYDOWN: 511 case SDL_KEYDOWN:
508 if ( event.key.keysym.sym == SDLK_ESCAPE ) { 512 if (event.key.keysym.sym == SDLK_ESCAPE) {
509 done = 1; 513 done = 1;
510 } 514 }
511 break; 515 break;
512 case SDL_QUIT: 516 case SDL_QUIT:
513 done = 1; 517 done = 1;
514 break; 518 break;
515 default: 519 default:
516 break; 520 break;
517 } 521 }
518 } 522 }
519 } 523 }
520 SDL_FreeSurface(light); 524 SDL_FreeSurface(light);
521 SDL_FreeSurface(sprite); 525 SDL_FreeSurface(sprite);
522 SDL_FreeSurface(backing); 526 SDL_FreeSurface(backing);
523 527
524 /* Print out some timing information */ 528 /* Print out some timing information */
525 if ( flashes > 0 ) { 529 if (flashes > 0) {
526 printf("%d alpha blits, ~%4.4f ms per blit\n", 530 printf("%d alpha blits, ~%4.4f ms per blit\n",
527 flashes, (float)flashtime/flashes); 531 flashes, (float) flashtime / flashes);
528 } 532 }
529 533
530 SDL_Quit(); 534 SDL_Quit();
531 return(0); 535 return (0);
532 } 536 }