Mercurial > sdl-ios-xcode
annotate test/testalpha.c @ 1643:51038e80ae59
More general fix for bug #189
The clipping is done at a higher level, and the low level functions are
passed clipped rectangles. Drivers which don't support source clipping
have not been changed, so the image will be squished instead of clipped,
but at least they will no longer crash when the destination rect was out
of bounds.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 17 Apr 2006 06:47:23 +0000 |
| parents | 4d241ea8a1cd |
| children | 14717b52abc0 |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* Simple program: Fill a colormap with gray and stripe it down the screen, | |
| 3 Then move an alpha valued sprite around the screen. | |
| 4 */ | |
| 5 | |
| 6 #include <stdio.h> | |
| 7 #include <stdlib.h> | |
| 8 #include <string.h> | |
| 9 #include <math.h> | |
| 10 | |
| 11 #include "SDL.h" | |
| 12 | |
| 13 #define FRAME_TICKS (1000/30) /* 30 frames/second */ | |
| 14 | |
|
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15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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16 static void quit(int rc) |
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17 { |
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18 SDL_Quit(); |
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19 exit(rc); |
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20 } |
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21 |
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22 /* Fill the screen with a gradient */ |
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23 static void FillBackground(SDL_Surface *screen) |
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24 { |
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25 Uint8 *buffer; |
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26 Uint16 *buffer16; |
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27 Uint16 color; |
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28 Uint8 gradient; |
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29 int i, k; |
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30 |
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31 /* Set the surface pixels and refresh! */ |
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32 if ( SDL_LockSurface(screen) < 0 ) { |
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33 fprintf(stderr, "Couldn't lock the display surface: %s\n", |
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34 SDL_GetError()); |
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35 quit(2); |
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36 } |
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37 buffer=(Uint8 *)screen->pixels; |
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38 if (screen->format->BytesPerPixel!=2) { |
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39 for ( i=0; i<screen->h; ++i ) { |
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40 memset(buffer,(i*255)/screen->h, screen->w*screen->format->BytesPerPixel); |
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41 buffer += screen->pitch; |
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42 } |
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43 } |
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44 else |
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45 { |
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46 for ( i=0; i<screen->h; ++i ) { |
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47 gradient=((i*255)/screen->h); |
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48 color = (Uint16)SDL_MapRGB(screen->format, gradient, gradient, gradient); |
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49 buffer16=(Uint16*)buffer; |
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50 for (k=0; k<screen->w; k++) |
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51 { |
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52 *(buffer16+k)=color; |
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53 } |
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54 buffer += screen->pitch; |
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55 } |
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56 } |
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57 |
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58 SDL_UnlockSurface(screen); |
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59 SDL_UpdateRect(screen, 0, 0, 0, 0); |
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60 } |
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61 |
| 0 | 62 /* Create a "light" -- a yellowish surface with variable alpha */ |
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63 SDL_Surface *CreateLight(int radius) |
| 0 | 64 { |
| 65 Uint8 trans, alphamask; | |
| 66 int range, addition; | |
| 67 int xdist, ydist; | |
| 68 Uint16 x, y; | |
| 69 Uint16 skip; | |
| 70 Uint32 pixel; | |
| 71 SDL_Surface *light; | |
| 72 | |
| 73 #ifdef LIGHT_16BIT | |
| 74 Uint16 *buf; | |
| 75 | |
| 76 /* 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 */ | |
| 78 alphamask = 0x0000000F; | |
| 79 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16, | |
| 80 0x0000F000, 0x00000F00, 0x000000F0, alphamask); | |
| 81 #else | |
| 82 Uint32 *buf; | |
| 83 | |
| 84 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */ | |
| 85 alphamask = 0x000000FF; | |
| 86 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32, | |
| 87 0xFF000000, 0x00FF0000, 0x0000FF00, alphamask); | |
| 88 if ( light == NULL ) { | |
| 89 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError()); | |
| 90 return(NULL); | |
| 91 } | |
| 92 #endif | |
| 93 | |
| 94 /* Fill with a light yellow-orange color */ | |
| 95 skip = light->pitch-(light->w*light->format->BytesPerPixel); | |
| 96 #ifdef LIGHT_16BIT | |
| 97 buf = (Uint16 *)light->pixels; | |
| 98 #else | |
| 99 buf = (Uint32 *)light->pixels; | |
| 100 #endif | |
| 101 /* Get a tranparent pixel value - we'll add alpha later */ | |
| 102 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0); | |
| 103 for ( y=0; y<light->h; ++y ) { | |
| 104 for ( x=0; x<light->w; ++x ) { | |
| 105 *buf++ = pixel; | |
| 106 } | |
| 107 buf += skip; /* Almost always 0, but just in case... */ | |
| 108 } | |
| 109 | |
| 110 /* Calculate alpha values for the surface. */ | |
| 111 #ifdef LIGHT_16BIT | |
| 112 buf = (Uint16 *)light->pixels; | |
| 113 #else | |
| 114 buf = (Uint32 *)light->pixels; | |
| 115 #endif | |
| 116 for ( y=0; y<light->h; ++y ) { | |
| 117 for ( x=0; x<light->w; ++x ) { | |
| 118 /* Slow distance formula (from center of light) */ | |
| 119 xdist = x-(light->w/2); | |
| 120 ydist = y-(light->h/2); | |
| 121 range = (int)sqrt(xdist*xdist+ydist*ydist); | |
| 122 | |
| 123 /* Scale distance to range of transparency (0-255) */ | |
| 124 if ( range > radius ) { | |
| 125 trans = alphamask; | |
| 126 } else { | |
| 127 /* Increasing transparency with distance */ | |
| 128 trans = (Uint8)((range*alphamask)/radius); | |
| 129 | |
| 130 /* Lights are very transparent */ | |
| 131 addition = (alphamask+1)/8; | |
| 132 if ( (int)trans+addition > alphamask ) { | |
| 133 trans = alphamask; | |
| 134 } else { | |
| 135 trans += addition; | |
| 136 } | |
| 137 } | |
| 138 /* We set the alpha component as the right N bits */ | |
| 139 *buf++ |= (255-trans); | |
| 140 } | |
| 141 buf += skip; /* Almost always 0, but just in case... */ | |
| 142 } | |
| 143 /* Enable RLE acceleration of this alpha surface */ | |
| 144 SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0); | |
| 145 | |
| 146 /* We're done! */ | |
| 147 return(light); | |
| 148 } | |
| 149 | |
| 150 static Uint32 flashes = 0; | |
| 151 static Uint32 flashtime = 0; | |
| 152 | |
| 153 void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y) | |
| 154 { | |
| 155 SDL_Rect position; | |
| 156 Uint32 ticks1; | |
| 157 Uint32 ticks2; | |
| 158 | |
| 159 /* Easy, center light */ | |
| 160 position.x = x-(light->w/2); | |
| 161 position.y = y-(light->h/2); | |
| 162 position.w = light->w; | |
| 163 position.h = light->h; | |
| 164 ticks1 = SDL_GetTicks(); | |
| 165 SDL_BlitSurface(light, NULL, screen, &position); | |
| 166 ticks2 = SDL_GetTicks(); | |
| 167 SDL_UpdateRects(screen, 1, &position); | |
| 168 ++flashes; | |
| 169 | |
| 170 /* Update time spend doing alpha blitting */ | |
| 171 flashtime += (ticks2-ticks1); | |
| 172 } | |
| 173 | |
| 174 static int sprite_visible = 0; | |
| 175 static SDL_Surface *sprite; | |
| 176 static SDL_Surface *backing; | |
| 177 static SDL_Rect position; | |
| 178 static int x_vel, y_vel; | |
| 179 static int alpha_vel; | |
| 180 | |
| 181 int LoadSprite(SDL_Surface *screen, char *file) | |
| 182 { | |
| 183 SDL_Surface *converted; | |
| 184 | |
| 185 /* Load the sprite image */ | |
| 186 sprite = SDL_LoadBMP(file); | |
| 187 if ( sprite == NULL ) { | |
| 188 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); | |
| 189 return(-1); | |
| 190 } | |
| 191 | |
| 192 /* Set transparent pixel as the pixel at (0,0) */ | |
| 193 if ( sprite->format->palette ) { | |
| 194 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, | |
| 195 *(Uint8 *)sprite->pixels); | |
| 196 } | |
| 197 | |
| 198 /* Convert sprite to video format */ | |
| 199 converted = SDL_DisplayFormat(sprite); | |
| 200 SDL_FreeSurface(sprite); | |
| 201 if ( converted == NULL ) { | |
| 202 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 203 SDL_GetError()); | |
| 204 return(-1); | |
| 205 } | |
| 206 sprite = converted; | |
| 207 | |
| 208 /* Create the background */ | |
| 209 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8, | |
| 210 0, 0, 0, 0); | |
| 211 if ( backing == NULL ) { | |
| 212 fprintf(stderr, "Couldn't create background: %s\n", | |
| 213 SDL_GetError()); | |
| 214 SDL_FreeSurface(sprite); | |
| 215 return(-1); | |
| 216 } | |
| 217 | |
| 218 /* Convert background to video format */ | |
| 219 converted = SDL_DisplayFormat(backing); | |
| 220 SDL_FreeSurface(backing); | |
| 221 if ( converted == NULL ) { | |
| 222 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 223 SDL_GetError()); | |
| 224 SDL_FreeSurface(sprite); | |
| 225 return(-1); | |
| 226 } | |
| 227 backing = converted; | |
| 228 | |
| 229 /* Set the initial position of the sprite */ | |
| 230 position.x = (screen->w-sprite->w)/2; | |
| 231 position.y = (screen->h-sprite->h)/2; | |
| 232 position.w = sprite->w; | |
| 233 position.h = sprite->h; | |
| 234 x_vel = 0; y_vel = 0; | |
| 235 alpha_vel = 1; | |
| 236 | |
| 237 /* We're ready to roll. :) */ | |
| 238 return(0); | |
| 239 } | |
| 240 | |
| 241 void AttractSprite(Uint16 x, Uint16 y) | |
| 242 { | |
| 243 x_vel = ((int)x-position.x)/10; | |
| 244 y_vel = ((int)y-position.y)/10; | |
| 245 } | |
| 246 | |
| 247 void MoveSprite(SDL_Surface *screen, SDL_Surface *light) | |
| 248 { | |
| 249 SDL_Rect updates[2]; | |
| 250 int alpha; | |
| 251 | |
| 252 /* Erase the sprite if it was visible */ | |
| 253 if ( sprite_visible ) { | |
| 254 updates[0] = position; | |
| 255 SDL_BlitSurface(backing, NULL, screen, &updates[0]); | |
| 256 } else { | |
| 257 updates[0].x = 0; updates[0].y = 0; | |
| 258 updates[0].w = 0; updates[0].h = 0; | |
| 259 sprite_visible = 1; | |
| 260 } | |
| 261 | |
| 262 /* Since the sprite is off the screen, we can do other drawing | |
| 263 without being overwritten by the saved area behind the sprite. | |
| 264 */ | |
| 265 if ( light != NULL ) { | |
| 266 int x, y; | |
| 267 | |
| 268 SDL_GetMouseState(&x, &y); | |
| 269 FlashLight(screen, light, x, y); | |
| 270 } | |
| 271 | |
| 272 /* Move the sprite, bounce at the wall */ | |
| 273 position.x += x_vel; | |
| 274 if ( (position.x < 0) || (position.x >= screen->w) ) { | |
| 275 x_vel = -x_vel; | |
| 276 position.x += x_vel; | |
| 277 } | |
| 278 position.y += y_vel; | |
| 279 if ( (position.y < 0) || (position.y >= screen->h) ) { | |
| 280 y_vel = -y_vel; | |
| 281 position.y += y_vel; | |
| 282 } | |
| 283 | |
| 284 /* Update transparency (fade in and out) */ | |
| 285 alpha = sprite->format->alpha; | |
| 286 if ( (alpha+alpha_vel) < 0 ) { | |
| 287 alpha_vel = -alpha_vel; | |
| 288 } else | |
| 289 if ( (alpha+alpha_vel) > 255 ) { | |
| 290 alpha_vel = -alpha_vel; | |
| 291 } | |
| 292 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel)); | |
| 293 | |
| 294 /* Save the area behind the sprite */ | |
| 295 updates[1] = position; | |
| 296 SDL_BlitSurface(screen, &updates[1], backing, NULL); | |
| 297 | |
| 298 /* Blit the sprite onto the screen */ | |
| 299 updates[1] = position; | |
| 300 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); | |
| 301 | |
| 302 /* Make it so! */ | |
| 303 SDL_UpdateRects(screen, 2, updates); | |
| 304 } | |
| 305 | |
| 306 void WarpSprite(SDL_Surface *screen, int x, int y) | |
| 307 { | |
| 308 SDL_Rect updates[2]; | |
| 309 | |
| 310 /* Erase, move, Draw, update */ | |
| 311 updates[0] = position; | |
| 312 SDL_BlitSurface(backing, NULL, screen, &updates[0]); | |
| 313 position.x = x-sprite->w/2; /* Center about X */ | |
| 314 position.y = y-sprite->h/2; /* Center about Y */ | |
| 315 updates[1] = position; | |
| 316 SDL_BlitSurface(screen, &updates[1], backing, NULL); | |
| 317 updates[1] = position; | |
| 318 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); | |
| 319 SDL_UpdateRects(screen, 2, updates); | |
| 320 } | |
| 321 | |
| 322 int main(int argc, char *argv[]) | |
| 323 { | |
| 324 const SDL_VideoInfo *info; | |
| 325 SDL_Surface *screen; | |
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326 int w, h; |
| 0 | 327 Uint8 video_bpp; |
| 328 Uint32 videoflags; | |
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329 int i, done; |
| 0 | 330 SDL_Event event; |
| 331 SDL_Surface *light; | |
| 332 int mouse_pressed; | |
| 333 Uint32 ticks, lastticks; | |
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334 |
| 0 | 335 |
| 336 /* Initialize SDL */ | |
| 337 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 338 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
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339 return(1); |
| 0 | 340 } |
| 341 | |
| 342 /* Alpha blending doesn't work well at 8-bit color */ | |
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343 #ifdef _WIN32_WCE |
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344 /* Pocket PC */ |
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345 w = 240; |
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346 h = 320; |
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347 #else |
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348 w = 640; |
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349 h = 480; |
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350 #endif |
| 0 | 351 info = SDL_GetVideoInfo(); |
| 352 if ( info->vfmt->BitsPerPixel > 8 ) { | |
| 353 video_bpp = info->vfmt->BitsPerPixel; | |
| 354 } else { | |
| 355 video_bpp = 16; | |
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356 fprintf(stderr, "forced 16 bpp mode\n"); |
| 0 | 357 } |
| 358 videoflags = SDL_SWSURFACE; | |
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359 for ( i = 1; argv[i]; ++i ) { |
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360 if ( strcmp(argv[i], "-bpp") == 0 ) { |
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361 video_bpp = atoi(argv[++i]); |
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362 if (video_bpp<=8) { |
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363 video_bpp=16; |
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364 fprintf(stderr, "forced 16 bpp mode\n"); |
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365 } |
| 0 | 366 } else |
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367 if ( strcmp(argv[i], "-hw") == 0 ) { |
| 0 | 368 videoflags |= SDL_HWSURFACE; |
| 369 } else | |
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370 if ( strcmp(argv[i], "-warp") == 0 ) { |
| 0 | 371 videoflags |= SDL_HWPALETTE; |
| 372 } else | |
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373 if ( strcmp(argv[i], "-width") == 0 && argv[i+1] ) { |
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374 w = atoi(argv[++i]); |
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375 } else |
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376 if ( strcmp(argv[i], "-height") == 0 && argv[i+1] ) { |
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377 h = atoi(argv[++i]); |
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378 } else |
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379 if ( strcmp(argv[i], "-resize") == 0 ) { |
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380 videoflags |= SDL_RESIZABLE; |
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381 } else |
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382 if ( strcmp(argv[i], "-noframe") == 0 ) { |
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383 videoflags |= SDL_NOFRAME; |
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384 } else |
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385 if ( strcmp(argv[i], "-fullscreen") == 0 ) { |
| 0 | 386 videoflags |= SDL_FULLSCREEN; |
| 387 } else { | |
| 388 fprintf(stderr, | |
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389 "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n", |
| 0 | 390 argv[0]); |
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391 quit(1); |
| 0 | 392 } |
| 393 } | |
| 394 | |
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395 /* Set video mode */ |
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396 if ( (screen=SDL_SetVideoMode(w,h,video_bpp,videoflags)) == NULL ) { |
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397 fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n", |
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398 w, h, video_bpp, SDL_GetError()); |
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399 quit(2); |
| 0 | 400 } |
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401 FillBackground(screen); |
| 0 | 402 |
| 403 /* Create the light */ | |
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404 light = CreateLight(82); |
| 0 | 405 if ( light == NULL ) { |
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406 quit(1); |
| 0 | 407 } |
| 408 | |
| 409 /* Load the sprite */ | |
| 410 if ( LoadSprite(screen, "icon.bmp") < 0 ) { | |
| 411 SDL_FreeSurface(light); | |
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412 quit(1); |
| 0 | 413 } |
| 414 | |
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415 /* Print out information about our surfaces */ |
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416 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); |
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417 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
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418 printf("Screen is in video memory\n"); |
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419 } else { |
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420 printf("Screen is in system memory\n"); |
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421 } |
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422 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { |
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423 printf("Screen has double-buffering enabled\n"); |
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424 } |
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425 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
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426 printf("Sprite is in video memory\n"); |
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427 } else { |
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428 printf("Sprite is in system memory\n"); |
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429 } |
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430 |
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431 /* Run a sample blit to trigger blit acceleration */ |
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432 MoveSprite(screen, NULL); |
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433 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
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434 printf("Sprite blit uses hardware alpha acceleration\n"); |
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435 } else { |
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436 printf("Sprite blit dosn't uses hardware alpha acceleration\n"); |
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437 } |
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438 |
| 0 | 439 /* Set a clipping rectangle to clip the outside edge of the screen */ |
| 440 { SDL_Rect clip; | |
| 441 clip.x = 32; | |
| 442 clip.y = 32; | |
| 443 clip.w = screen->w-(2*32); | |
| 444 clip.h = screen->h-(2*32); | |
| 445 SDL_SetClipRect(screen, &clip); | |
| 446 } | |
| 447 | |
| 448 /* Wait for a keystroke */ | |
| 449 lastticks = SDL_GetTicks(); | |
| 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 | |
| 465 fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks)); | |
| 466 #endif | |
| 467 SDL_Delay(FRAME_TICKS-(ticks-lastticks)); | |
| 468 #ifdef CHECK_SLEEP_GRANULARITY | |
| 469 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks)); | |
| 470 #endif | |
| 471 } | |
| 472 lastticks = ticks; | |
| 473 | |
| 474 /* Check for events */ | |
| 475 while ( SDL_PollEvent(&event) ) { | |
| 476 switch (event.type) { | |
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477 case SDL_VIDEORESIZE: |
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478 screen = SDL_SetVideoMode(event.resize.w, event.resize.h, video_bpp, videoflags); |
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479 if ( screen ) { |
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480 FillBackground(screen); |
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481 } |
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482 break; |
| 0 | 483 /* Attract sprite while mouse is held down */ |
| 484 case SDL_MOUSEMOTION: | |
| 485 if (event.motion.state != 0) { | |
| 486 AttractSprite(event.motion.x, | |
| 487 event.motion.y); | |
| 488 mouse_pressed = 1; | |
| 489 } | |
| 490 break; | |
| 491 case SDL_MOUSEBUTTONDOWN: | |
| 492 if ( event.button.button == 1 ) { | |
| 493 AttractSprite(event.button.x, | |
| 494 event.button.y); | |
| 495 mouse_pressed = 1; | |
| 496 } else { | |
| 497 SDL_Rect area; | |
| 498 | |
| 499 area.x = event.button.x-16; | |
| 500 area.y = event.button.y-16; | |
| 501 area.w = 32; | |
| 502 area.h = 32; | |
| 503 SDL_FillRect(screen, &area, 0); | |
| 504 SDL_UpdateRects(screen,1,&area); | |
| 505 } | |
| 506 break; | |
| 507 case SDL_KEYDOWN: | |
| 508 /* Any keypress quits the app... */ | |
| 509 case SDL_QUIT: | |
| 510 done = 1; | |
| 511 break; | |
| 512 default: | |
| 513 break; | |
| 514 } | |
| 515 } | |
| 516 } | |
| 517 SDL_FreeSurface(light); | |
| 518 SDL_FreeSurface(sprite); | |
| 519 SDL_FreeSurface(backing); | |
| 520 | |
| 521 /* Print out some timing information */ | |
| 522 if ( flashes > 0 ) { | |
| 523 printf("%d alpha blits, ~%4.4f ms per blit\n", | |
| 524 flashes, (float)flashtime/flashes); | |
| 525 } | |
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526 |
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527 SDL_Quit(); |
| 0 | 528 return(0); |
| 529 } |