Mercurial > sdl-ios-xcode
annotate test/testalpha.c @ 1270:b1425473be0f
Updated config* from CVS
http://cvs.savannah.gnu.org/viewcvs/config/?root=config
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 26 Jan 2006 07:33:57 +0000 |
| parents | 51a8702d8ecd |
| children | 23b1ef7d003b |
| 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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parents:
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16 static void quit(int rc) |
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parents:
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17 { |
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parents:
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18 SDL_Quit(); |
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parents:
886
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19 exit(rc); |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
886
diff
changeset
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20 } |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
886
diff
changeset
|
21 |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
886
diff
changeset
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22 |
| 0 | 23 /* Create a "light" -- a yellowish surface with variable alpha */ |
| 24 SDL_Surface *CreateLight(SDL_Surface *screen, int radius) | |
| 25 { | |
| 26 Uint8 trans, alphamask; | |
| 27 int range, addition; | |
| 28 int xdist, ydist; | |
| 29 Uint16 x, y; | |
| 30 Uint16 skip; | |
| 31 Uint32 pixel; | |
| 32 SDL_Surface *light; | |
| 33 | |
| 34 #ifdef LIGHT_16BIT | |
| 35 Uint16 *buf; | |
| 36 | |
| 37 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */ | |
| 38 /* Note: this isn't any faster than a 32 bit alpha surface */ | |
| 39 alphamask = 0x0000000F; | |
| 40 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16, | |
| 41 0x0000F000, 0x00000F00, 0x000000F0, alphamask); | |
| 42 #else | |
| 43 Uint32 *buf; | |
| 44 | |
| 45 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */ | |
| 46 alphamask = 0x000000FF; | |
| 47 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32, | |
| 48 0xFF000000, 0x00FF0000, 0x0000FF00, alphamask); | |
| 49 if ( light == NULL ) { | |
| 50 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError()); | |
| 51 return(NULL); | |
| 52 } | |
| 53 #endif | |
| 54 | |
| 55 /* Fill with a light yellow-orange color */ | |
| 56 skip = light->pitch-(light->w*light->format->BytesPerPixel); | |
| 57 #ifdef LIGHT_16BIT | |
| 58 buf = (Uint16 *)light->pixels; | |
| 59 #else | |
| 60 buf = (Uint32 *)light->pixels; | |
| 61 #endif | |
| 62 /* Get a tranparent pixel value - we'll add alpha later */ | |
| 63 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0); | |
| 64 for ( y=0; y<light->h; ++y ) { | |
| 65 for ( x=0; x<light->w; ++x ) { | |
| 66 *buf++ = pixel; | |
| 67 } | |
| 68 buf += skip; /* Almost always 0, but just in case... */ | |
| 69 } | |
| 70 | |
| 71 /* Calculate alpha values for the surface. */ | |
| 72 #ifdef LIGHT_16BIT | |
| 73 buf = (Uint16 *)light->pixels; | |
| 74 #else | |
| 75 buf = (Uint32 *)light->pixels; | |
| 76 #endif | |
| 77 for ( y=0; y<light->h; ++y ) { | |
| 78 for ( x=0; x<light->w; ++x ) { | |
| 79 /* Slow distance formula (from center of light) */ | |
| 80 xdist = x-(light->w/2); | |
| 81 ydist = y-(light->h/2); | |
| 82 range = (int)sqrt(xdist*xdist+ydist*ydist); | |
| 83 | |
| 84 /* Scale distance to range of transparency (0-255) */ | |
| 85 if ( range > radius ) { | |
| 86 trans = alphamask; | |
| 87 } else { | |
| 88 /* Increasing transparency with distance */ | |
| 89 trans = (Uint8)((range*alphamask)/radius); | |
| 90 | |
| 91 /* Lights are very transparent */ | |
| 92 addition = (alphamask+1)/8; | |
| 93 if ( (int)trans+addition > alphamask ) { | |
| 94 trans = alphamask; | |
| 95 } else { | |
| 96 trans += addition; | |
| 97 } | |
| 98 } | |
| 99 /* We set the alpha component as the right N bits */ | |
| 100 *buf++ |= (255-trans); | |
| 101 } | |
| 102 buf += skip; /* Almost always 0, but just in case... */ | |
| 103 } | |
| 104 /* Enable RLE acceleration of this alpha surface */ | |
| 105 SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0); | |
| 106 | |
| 107 /* We're done! */ | |
| 108 return(light); | |
| 109 } | |
| 110 | |
| 111 static Uint32 flashes = 0; | |
| 112 static Uint32 flashtime = 0; | |
| 113 | |
| 114 void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y) | |
| 115 { | |
| 116 SDL_Rect position; | |
| 117 Uint32 ticks1; | |
| 118 Uint32 ticks2; | |
| 119 | |
| 120 /* Easy, center light */ | |
| 121 position.x = x-(light->w/2); | |
| 122 position.y = y-(light->h/2); | |
| 123 position.w = light->w; | |
| 124 position.h = light->h; | |
| 125 ticks1 = SDL_GetTicks(); | |
| 126 SDL_BlitSurface(light, NULL, screen, &position); | |
| 127 ticks2 = SDL_GetTicks(); | |
| 128 SDL_UpdateRects(screen, 1, &position); | |
| 129 ++flashes; | |
| 130 | |
| 131 /* Update time spend doing alpha blitting */ | |
| 132 flashtime += (ticks2-ticks1); | |
| 133 } | |
| 134 | |
| 135 static int sprite_visible = 0; | |
| 136 static SDL_Surface *sprite; | |
| 137 static SDL_Surface *backing; | |
| 138 static SDL_Rect position; | |
| 139 static int x_vel, y_vel; | |
| 140 static int alpha_vel; | |
| 141 | |
| 142 int LoadSprite(SDL_Surface *screen, char *file) | |
| 143 { | |
| 144 SDL_Surface *converted; | |
| 145 | |
| 146 /* Load the sprite image */ | |
| 147 sprite = SDL_LoadBMP(file); | |
| 148 if ( sprite == NULL ) { | |
| 149 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); | |
| 150 return(-1); | |
| 151 } | |
| 152 | |
| 153 /* Set transparent pixel as the pixel at (0,0) */ | |
| 154 if ( sprite->format->palette ) { | |
| 155 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, | |
| 156 *(Uint8 *)sprite->pixels); | |
| 157 } | |
| 158 | |
| 159 /* Convert sprite to video format */ | |
| 160 converted = SDL_DisplayFormat(sprite); | |
| 161 SDL_FreeSurface(sprite); | |
| 162 if ( converted == NULL ) { | |
| 163 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 164 SDL_GetError()); | |
| 165 return(-1); | |
| 166 } | |
| 167 sprite = converted; | |
| 168 | |
| 169 /* Create the background */ | |
| 170 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8, | |
| 171 0, 0, 0, 0); | |
| 172 if ( backing == NULL ) { | |
| 173 fprintf(stderr, "Couldn't create background: %s\n", | |
| 174 SDL_GetError()); | |
| 175 SDL_FreeSurface(sprite); | |
| 176 return(-1); | |
| 177 } | |
| 178 | |
| 179 /* Convert background to video format */ | |
| 180 converted = SDL_DisplayFormat(backing); | |
| 181 SDL_FreeSurface(backing); | |
| 182 if ( converted == NULL ) { | |
| 183 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 184 SDL_GetError()); | |
| 185 SDL_FreeSurface(sprite); | |
| 186 return(-1); | |
| 187 } | |
| 188 backing = converted; | |
| 189 | |
| 190 /* Set the initial position of the sprite */ | |
| 191 position.x = (screen->w-sprite->w)/2; | |
| 192 position.y = (screen->h-sprite->h)/2; | |
| 193 position.w = sprite->w; | |
| 194 position.h = sprite->h; | |
| 195 x_vel = 0; y_vel = 0; | |
| 196 alpha_vel = 1; | |
| 197 | |
| 198 /* We're ready to roll. :) */ | |
| 199 return(0); | |
| 200 } | |
| 201 | |
| 202 void AttractSprite(Uint16 x, Uint16 y) | |
| 203 { | |
| 204 x_vel = ((int)x-position.x)/10; | |
| 205 y_vel = ((int)y-position.y)/10; | |
| 206 } | |
| 207 | |
| 208 void MoveSprite(SDL_Surface *screen, SDL_Surface *light) | |
| 209 { | |
| 210 SDL_Rect updates[2]; | |
| 211 int alpha; | |
| 212 | |
| 213 /* Erase the sprite if it was visible */ | |
| 214 if ( sprite_visible ) { | |
| 215 updates[0] = position; | |
| 216 SDL_BlitSurface(backing, NULL, screen, &updates[0]); | |
| 217 } else { | |
| 218 updates[0].x = 0; updates[0].y = 0; | |
| 219 updates[0].w = 0; updates[0].h = 0; | |
| 220 sprite_visible = 1; | |
| 221 } | |
| 222 | |
| 223 /* Since the sprite is off the screen, we can do other drawing | |
| 224 without being overwritten by the saved area behind the sprite. | |
| 225 */ | |
| 226 if ( light != NULL ) { | |
| 227 int x, y; | |
| 228 | |
| 229 SDL_GetMouseState(&x, &y); | |
| 230 FlashLight(screen, light, x, y); | |
| 231 } | |
| 232 | |
| 233 /* Move the sprite, bounce at the wall */ | |
| 234 position.x += x_vel; | |
| 235 if ( (position.x < 0) || (position.x >= screen->w) ) { | |
| 236 x_vel = -x_vel; | |
| 237 position.x += x_vel; | |
| 238 } | |
| 239 position.y += y_vel; | |
| 240 if ( (position.y < 0) || (position.y >= screen->h) ) { | |
| 241 y_vel = -y_vel; | |
| 242 position.y += y_vel; | |
| 243 } | |
| 244 | |
| 245 /* Update transparency (fade in and out) */ | |
| 246 alpha = sprite->format->alpha; | |
| 247 if ( (alpha+alpha_vel) < 0 ) { | |
| 248 alpha_vel = -alpha_vel; | |
| 249 } else | |
| 250 if ( (alpha+alpha_vel) > 255 ) { | |
| 251 alpha_vel = -alpha_vel; | |
| 252 } | |
| 253 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel)); | |
| 254 | |
| 255 /* Save the area behind the sprite */ | |
| 256 updates[1] = position; | |
| 257 SDL_BlitSurface(screen, &updates[1], backing, NULL); | |
| 258 | |
| 259 /* Blit the sprite onto the screen */ | |
| 260 updates[1] = position; | |
| 261 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); | |
| 262 | |
| 263 /* Make it so! */ | |
| 264 SDL_UpdateRects(screen, 2, updates); | |
| 265 } | |
| 266 | |
| 267 void WarpSprite(SDL_Surface *screen, int x, int y) | |
| 268 { | |
| 269 SDL_Rect updates[2]; | |
| 270 | |
| 271 /* Erase, move, Draw, update */ | |
| 272 updates[0] = position; | |
| 273 SDL_BlitSurface(backing, NULL, screen, &updates[0]); | |
| 274 position.x = x-sprite->w/2; /* Center about X */ | |
| 275 position.y = y-sprite->h/2; /* Center about Y */ | |
| 276 updates[1] = position; | |
| 277 SDL_BlitSurface(screen, &updates[1], backing, NULL); | |
| 278 updates[1] = position; | |
| 279 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); | |
| 280 SDL_UpdateRects(screen, 2, updates); | |
| 281 } | |
| 282 | |
| 283 int main(int argc, char *argv[]) | |
| 284 { | |
| 285 const SDL_VideoInfo *info; | |
| 286 SDL_Surface *screen; | |
| 287 Uint8 video_bpp; | |
| 288 Uint32 videoflags; | |
| 289 Uint8 *buffer; | |
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290 int i, k, done; |
| 0 | 291 SDL_Event event; |
| 292 SDL_Surface *light; | |
| 293 int mouse_pressed; | |
| 294 Uint32 ticks, lastticks; | |
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295 Uint16 *buffer16; |
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296 Uint16 color; |
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297 Uint8 gradient; |
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298 |
| 0 | 299 |
| 300 /* Initialize SDL */ | |
| 301 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 302 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
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parents:
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303 return(1); |
| 0 | 304 } |
| 305 | |
| 306 /* Alpha blending doesn't work well at 8-bit color */ | |
| 307 info = SDL_GetVideoInfo(); | |
| 308 if ( info->vfmt->BitsPerPixel > 8 ) { | |
| 309 video_bpp = info->vfmt->BitsPerPixel; | |
| 310 } else { | |
| 311 video_bpp = 16; | |
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312 fprintf(stderr, "forced 16 bpp mode\n"); |
| 0 | 313 } |
| 314 videoflags = SDL_SWSURFACE; | |
| 315 while ( argc > 1 ) { | |
| 316 --argc; | |
| 317 if ( strcmp(argv[argc-1], "-bpp") == 0 ) { | |
| 318 video_bpp = atoi(argv[argc]); | |
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319 if (video_bpp<=8) { |
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320 video_bpp=16; |
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321 fprintf(stderr, "forced 16 bpp mode\n"); |
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322 } |
| 0 | 323 --argc; |
| 324 } else | |
| 325 if ( strcmp(argv[argc], "-hw") == 0 ) { | |
| 326 videoflags |= SDL_HWSURFACE; | |
| 327 } else | |
| 328 if ( strcmp(argv[argc], "-warp") == 0 ) { | |
| 329 videoflags |= SDL_HWPALETTE; | |
| 330 } else | |
| 331 if ( strcmp(argv[argc], "-fullscreen") == 0 ) { | |
| 332 videoflags |= SDL_FULLSCREEN; | |
| 333 } else { | |
| 334 fprintf(stderr, | |
| 335 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", | |
| 336 argv[0]); | |
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parents:
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337 quit(1); |
| 0 | 338 } |
| 339 } | |
| 340 | |
| 341 /* Set 640x480 video mode */ | |
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342 #ifndef _WIN32_WCE |
| 0 | 343 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) { |
| 344 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", | |
| 345 video_bpp, SDL_GetError()); | |
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346 quit(2); |
| 0 | 347 } |
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348 #else |
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349 /* Pocket PC */ |
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350 if ( (screen=SDL_SetVideoMode(240,320,video_bpp,SDL_FULLSCREEN)) == NULL ) { |
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351 fprintf(stderr, "Couldn't set 240x320x%d video mode: %s\n", |
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352 video_bpp, SDL_GetError()); |
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353 quit(2); |
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354 } |
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355 #endif |
| 0 | 356 /* Set the surface pixels and refresh! */ |
| 357 if ( SDL_LockSurface(screen) < 0 ) { | |
| 358 fprintf(stderr, "Couldn't lock the display surface: %s\n", | |
| 359 SDL_GetError()); | |
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360 quit(2); |
| 0 | 361 } |
| 362 buffer=(Uint8 *)screen->pixels; | |
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363 if (screen->format->BytesPerPixel!=2) { |
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364 for ( i=0; i<screen->h; ++i ) { |
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365 memset(buffer,(i*255)/screen->h, screen->pitch); |
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366 buffer += screen->pitch; |
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367 } |
| 0 | 368 } |
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369 else |
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370 { |
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371 for ( i=0; i<screen->h; ++i ) { |
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372 gradient=((i*255)/screen->h); |
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373 color = SDL_MapRGB(screen->format, gradient, gradient, gradient); |
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374 buffer16=(Uint16*)buffer; |
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375 for (k=0; k<screen->w; k++) |
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376 { |
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377 *(buffer16+k)=color; |
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378 } |
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379 buffer += screen->pitch; |
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380 } |
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381 } |
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382 |
| 0 | 383 SDL_UnlockSurface(screen); |
| 384 SDL_UpdateRect(screen, 0, 0, 0, 0); | |
| 385 | |
| 386 /* Create the light */ | |
| 387 light = CreateLight(screen, 82); | |
| 388 if ( light == NULL ) { | |
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389 quit(1); |
| 0 | 390 } |
| 391 | |
| 392 /* Load the sprite */ | |
| 393 if ( LoadSprite(screen, "icon.bmp") < 0 ) { | |
| 394 SDL_FreeSurface(light); | |
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395 quit(1); |
| 0 | 396 } |
| 397 | |
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398 /* Print out information about our surfaces */ |
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399 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); |
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400 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
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401 printf("Screen is in video memory\n"); |
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402 } else { |
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403 printf("Screen is in system memory\n"); |
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404 } |
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405 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { |
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406 printf("Screen has double-buffering enabled\n"); |
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407 } |
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408 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
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409 printf("Sprite is in video memory\n"); |
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410 } else { |
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411 printf("Sprite is in system memory\n"); |
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412 } |
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413 |
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414 /* Run a sample blit to trigger blit acceleration */ |
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415 { SDL_Rect dst; |
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416 dst.x = 0; |
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417 dst.y = 0; |
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418 dst.w = sprite->w; |
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419 dst.h = sprite->h; |
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420 SDL_BlitSurface(sprite, NULL, screen, &dst); |
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421 SDL_FillRect(screen, &dst, 0); |
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422 } |
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423 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
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424 printf("Sprite blit uses hardware alpha acceleration\n"); |
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425 } else { |
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426 printf("Sprite blit dosn't uses hardware alpha acceleration\n"); |
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427 } |
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428 |
| 0 | 429 /* Set a clipping rectangle to clip the outside edge of the screen */ |
| 430 { SDL_Rect clip; | |
| 431 clip.x = 32; | |
| 432 clip.y = 32; | |
| 433 clip.w = screen->w-(2*32); | |
| 434 clip.h = screen->h-(2*32); | |
| 435 SDL_SetClipRect(screen, &clip); | |
| 436 } | |
| 437 | |
| 438 /* Wait for a keystroke */ | |
| 439 lastticks = SDL_GetTicks(); | |
| 440 done = 0; | |
| 441 mouse_pressed = 0; | |
| 442 while ( !done ) { | |
| 443 /* Update the frame -- move the sprite */ | |
| 444 if ( mouse_pressed ) { | |
| 445 MoveSprite(screen, light); | |
| 446 mouse_pressed = 0; | |
| 447 } else { | |
| 448 MoveSprite(screen, NULL); | |
| 449 } | |
| 450 | |
| 451 /* Slow down the loop to 30 frames/second */ | |
| 452 ticks = SDL_GetTicks(); | |
| 453 if ( (ticks-lastticks) < FRAME_TICKS ) { | |
| 454 #ifdef CHECK_SLEEP_GRANULARITY | |
| 455 fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks)); | |
| 456 #endif | |
| 457 SDL_Delay(FRAME_TICKS-(ticks-lastticks)); | |
| 458 #ifdef CHECK_SLEEP_GRANULARITY | |
| 459 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks)); | |
| 460 #endif | |
| 461 } | |
| 462 lastticks = ticks; | |
| 463 | |
| 464 /* Check for events */ | |
| 465 while ( SDL_PollEvent(&event) ) { | |
| 466 switch (event.type) { | |
| 467 /* Attract sprite while mouse is held down */ | |
| 468 case SDL_MOUSEMOTION: | |
| 469 if (event.motion.state != 0) { | |
| 470 AttractSprite(event.motion.x, | |
| 471 event.motion.y); | |
| 472 mouse_pressed = 1; | |
| 473 } | |
| 474 break; | |
| 475 case SDL_MOUSEBUTTONDOWN: | |
| 476 if ( event.button.button == 1 ) { | |
| 477 AttractSprite(event.button.x, | |
| 478 event.button.y); | |
| 479 mouse_pressed = 1; | |
| 480 } else { | |
| 481 SDL_Rect area; | |
| 482 | |
| 483 area.x = event.button.x-16; | |
| 484 area.y = event.button.y-16; | |
| 485 area.w = 32; | |
| 486 area.h = 32; | |
| 487 SDL_FillRect(screen, &area, 0); | |
| 488 SDL_UpdateRects(screen,1,&area); | |
| 489 } | |
| 490 break; | |
| 491 case SDL_KEYDOWN: | |
| 492 /* Any keypress quits the app... */ | |
| 493 case SDL_QUIT: | |
| 494 done = 1; | |
| 495 break; | |
| 496 default: | |
| 497 break; | |
| 498 } | |
| 499 } | |
| 500 } | |
| 501 SDL_FreeSurface(light); | |
| 502 SDL_FreeSurface(sprite); | |
| 503 SDL_FreeSurface(backing); | |
| 504 | |
| 505 /* Print out some timing information */ | |
| 506 if ( flashes > 0 ) { | |
| 507 printf("%d alpha blits, ~%4.4f ms per blit\n", | |
| 508 flashes, (float)flashtime/flashes); | |
| 509 } | |
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510 |
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511 SDL_Quit(); |
| 0 | 512 return(0); |
| 513 } |