Mercurial > sdl-ios-xcode
annotate test/testalpha.c @ 839:7b255f0290da
Added a test program for dynamically loading OpenGL
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 17 Feb 2004 18:16:49 +0000 |
| parents | 609543e2b3a1 |
| children | 05c551e5bc64 |
| 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 | |
| 15 /* Create a "light" -- a yellowish surface with variable alpha */ | |
| 16 SDL_Surface *CreateLight(SDL_Surface *screen, int radius) | |
| 17 { | |
| 18 Uint8 trans, alphamask; | |
| 19 int range, addition; | |
| 20 int xdist, ydist; | |
| 21 Uint16 x, y; | |
| 22 Uint16 skip; | |
| 23 Uint32 pixel; | |
| 24 SDL_Surface *light; | |
| 25 | |
| 26 #ifdef LIGHT_16BIT | |
| 27 Uint16 *buf; | |
| 28 | |
| 29 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */ | |
| 30 /* Note: this isn't any faster than a 32 bit alpha surface */ | |
| 31 alphamask = 0x0000000F; | |
| 32 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16, | |
| 33 0x0000F000, 0x00000F00, 0x000000F0, alphamask); | |
| 34 #else | |
| 35 Uint32 *buf; | |
| 36 | |
| 37 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */ | |
| 38 alphamask = 0x000000FF; | |
| 39 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32, | |
| 40 0xFF000000, 0x00FF0000, 0x0000FF00, alphamask); | |
| 41 if ( light == NULL ) { | |
| 42 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError()); | |
| 43 return(NULL); | |
| 44 } | |
| 45 #endif | |
| 46 | |
| 47 /* Fill with a light yellow-orange color */ | |
| 48 skip = light->pitch-(light->w*light->format->BytesPerPixel); | |
| 49 #ifdef LIGHT_16BIT | |
| 50 buf = (Uint16 *)light->pixels; | |
| 51 #else | |
| 52 buf = (Uint32 *)light->pixels; | |
| 53 #endif | |
| 54 /* Get a tranparent pixel value - we'll add alpha later */ | |
| 55 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0); | |
| 56 for ( y=0; y<light->h; ++y ) { | |
| 57 for ( x=0; x<light->w; ++x ) { | |
| 58 *buf++ = pixel; | |
| 59 } | |
| 60 buf += skip; /* Almost always 0, but just in case... */ | |
| 61 } | |
| 62 | |
| 63 /* Calculate alpha values for the surface. */ | |
| 64 #ifdef LIGHT_16BIT | |
| 65 buf = (Uint16 *)light->pixels; | |
| 66 #else | |
| 67 buf = (Uint32 *)light->pixels; | |
| 68 #endif | |
| 69 for ( y=0; y<light->h; ++y ) { | |
| 70 for ( x=0; x<light->w; ++x ) { | |
| 71 /* Slow distance formula (from center of light) */ | |
| 72 xdist = x-(light->w/2); | |
| 73 ydist = y-(light->h/2); | |
| 74 range = (int)sqrt(xdist*xdist+ydist*ydist); | |
| 75 | |
| 76 /* Scale distance to range of transparency (0-255) */ | |
| 77 if ( range > radius ) { | |
| 78 trans = alphamask; | |
| 79 } else { | |
| 80 /* Increasing transparency with distance */ | |
| 81 trans = (Uint8)((range*alphamask)/radius); | |
| 82 | |
| 83 /* Lights are very transparent */ | |
| 84 addition = (alphamask+1)/8; | |
| 85 if ( (int)trans+addition > alphamask ) { | |
| 86 trans = alphamask; | |
| 87 } else { | |
| 88 trans += addition; | |
| 89 } | |
| 90 } | |
| 91 /* We set the alpha component as the right N bits */ | |
| 92 *buf++ |= (255-trans); | |
| 93 } | |
| 94 buf += skip; /* Almost always 0, but just in case... */ | |
| 95 } | |
| 96 /* Enable RLE acceleration of this alpha surface */ | |
| 97 SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0); | |
| 98 | |
| 99 /* We're done! */ | |
| 100 return(light); | |
| 101 } | |
| 102 | |
| 103 static Uint32 flashes = 0; | |
| 104 static Uint32 flashtime = 0; | |
| 105 | |
| 106 void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y) | |
| 107 { | |
| 108 SDL_Rect position; | |
| 109 Uint32 ticks1; | |
| 110 Uint32 ticks2; | |
| 111 | |
| 112 /* Easy, center light */ | |
| 113 position.x = x-(light->w/2); | |
| 114 position.y = y-(light->h/2); | |
| 115 position.w = light->w; | |
| 116 position.h = light->h; | |
| 117 ticks1 = SDL_GetTicks(); | |
| 118 SDL_BlitSurface(light, NULL, screen, &position); | |
| 119 ticks2 = SDL_GetTicks(); | |
| 120 SDL_UpdateRects(screen, 1, &position); | |
| 121 ++flashes; | |
| 122 | |
| 123 /* Update time spend doing alpha blitting */ | |
| 124 flashtime += (ticks2-ticks1); | |
| 125 } | |
| 126 | |
| 127 static int sprite_visible = 0; | |
| 128 static SDL_Surface *sprite; | |
| 129 static SDL_Surface *backing; | |
| 130 static SDL_Rect position; | |
| 131 static int x_vel, y_vel; | |
| 132 static int alpha_vel; | |
| 133 | |
| 134 int LoadSprite(SDL_Surface *screen, char *file) | |
| 135 { | |
| 136 SDL_Surface *converted; | |
| 137 | |
| 138 /* Load the sprite image */ | |
| 139 sprite = SDL_LoadBMP(file); | |
| 140 if ( sprite == NULL ) { | |
| 141 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); | |
| 142 return(-1); | |
| 143 } | |
| 144 | |
| 145 /* Set transparent pixel as the pixel at (0,0) */ | |
| 146 if ( sprite->format->palette ) { | |
| 147 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, | |
| 148 *(Uint8 *)sprite->pixels); | |
| 149 } | |
| 150 | |
| 151 /* Convert sprite to video format */ | |
| 152 converted = SDL_DisplayFormat(sprite); | |
| 153 SDL_FreeSurface(sprite); | |
| 154 if ( converted == NULL ) { | |
| 155 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 156 SDL_GetError()); | |
| 157 return(-1); | |
| 158 } | |
| 159 sprite = converted; | |
| 160 | |
| 161 /* Create the background */ | |
| 162 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8, | |
| 163 0, 0, 0, 0); | |
| 164 if ( backing == NULL ) { | |
| 165 fprintf(stderr, "Couldn't create background: %s\n", | |
| 166 SDL_GetError()); | |
| 167 SDL_FreeSurface(sprite); | |
| 168 return(-1); | |
| 169 } | |
| 170 | |
| 171 /* Convert background to video format */ | |
| 172 converted = SDL_DisplayFormat(backing); | |
| 173 SDL_FreeSurface(backing); | |
| 174 if ( converted == NULL ) { | |
| 175 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 176 SDL_GetError()); | |
| 177 SDL_FreeSurface(sprite); | |
| 178 return(-1); | |
| 179 } | |
| 180 backing = converted; | |
| 181 | |
| 182 /* Set the initial position of the sprite */ | |
| 183 position.x = (screen->w-sprite->w)/2; | |
| 184 position.y = (screen->h-sprite->h)/2; | |
| 185 position.w = sprite->w; | |
| 186 position.h = sprite->h; | |
| 187 x_vel = 0; y_vel = 0; | |
| 188 alpha_vel = 1; | |
| 189 | |
| 190 /* We're ready to roll. :) */ | |
| 191 return(0); | |
| 192 } | |
| 193 | |
| 194 void AttractSprite(Uint16 x, Uint16 y) | |
| 195 { | |
| 196 x_vel = ((int)x-position.x)/10; | |
| 197 y_vel = ((int)y-position.y)/10; | |
| 198 } | |
| 199 | |
| 200 void MoveSprite(SDL_Surface *screen, SDL_Surface *light) | |
| 201 { | |
| 202 SDL_Rect updates[2]; | |
| 203 int alpha; | |
| 204 | |
| 205 /* Erase the sprite if it was visible */ | |
| 206 if ( sprite_visible ) { | |
| 207 updates[0] = position; | |
| 208 SDL_BlitSurface(backing, NULL, screen, &updates[0]); | |
| 209 } else { | |
| 210 updates[0].x = 0; updates[0].y = 0; | |
| 211 updates[0].w = 0; updates[0].h = 0; | |
| 212 sprite_visible = 1; | |
| 213 } | |
| 214 | |
| 215 /* Since the sprite is off the screen, we can do other drawing | |
| 216 without being overwritten by the saved area behind the sprite. | |
| 217 */ | |
| 218 if ( light != NULL ) { | |
| 219 int x, y; | |
| 220 | |
| 221 SDL_GetMouseState(&x, &y); | |
| 222 FlashLight(screen, light, x, y); | |
| 223 } | |
| 224 | |
| 225 /* Move the sprite, bounce at the wall */ | |
| 226 position.x += x_vel; | |
| 227 if ( (position.x < 0) || (position.x >= screen->w) ) { | |
| 228 x_vel = -x_vel; | |
| 229 position.x += x_vel; | |
| 230 } | |
| 231 position.y += y_vel; | |
| 232 if ( (position.y < 0) || (position.y >= screen->h) ) { | |
| 233 y_vel = -y_vel; | |
| 234 position.y += y_vel; | |
| 235 } | |
| 236 | |
| 237 /* Update transparency (fade in and out) */ | |
| 238 alpha = sprite->format->alpha; | |
| 239 if ( (alpha+alpha_vel) < 0 ) { | |
| 240 alpha_vel = -alpha_vel; | |
| 241 } else | |
| 242 if ( (alpha+alpha_vel) > 255 ) { | |
| 243 alpha_vel = -alpha_vel; | |
| 244 } | |
| 245 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel)); | |
| 246 | |
| 247 /* Save the area behind the sprite */ | |
| 248 updates[1] = position; | |
| 249 SDL_BlitSurface(screen, &updates[1], backing, NULL); | |
| 250 | |
| 251 /* Blit the sprite onto the screen */ | |
| 252 updates[1] = position; | |
| 253 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); | |
| 254 | |
| 255 /* Make it so! */ | |
| 256 SDL_UpdateRects(screen, 2, updates); | |
| 257 } | |
| 258 | |
| 259 void WarpSprite(SDL_Surface *screen, int x, int y) | |
| 260 { | |
| 261 SDL_Rect updates[2]; | |
| 262 | |
| 263 /* Erase, move, Draw, update */ | |
| 264 updates[0] = position; | |
| 265 SDL_BlitSurface(backing, NULL, screen, &updates[0]); | |
| 266 position.x = x-sprite->w/2; /* Center about X */ | |
| 267 position.y = y-sprite->h/2; /* Center about Y */ | |
| 268 updates[1] = position; | |
| 269 SDL_BlitSurface(screen, &updates[1], backing, NULL); | |
| 270 updates[1] = position; | |
| 271 SDL_BlitSurface(sprite, NULL, screen, &updates[1]); | |
| 272 SDL_UpdateRects(screen, 2, updates); | |
| 273 } | |
| 274 | |
| 275 int main(int argc, char *argv[]) | |
| 276 { | |
| 277 const SDL_VideoInfo *info; | |
| 278 SDL_Surface *screen; | |
| 279 Uint8 video_bpp; | |
| 280 Uint32 videoflags; | |
| 281 Uint8 *buffer; | |
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282 int i, k, done; |
| 0 | 283 SDL_Event event; |
| 284 SDL_Surface *light; | |
| 285 int mouse_pressed; | |
| 286 Uint32 ticks, lastticks; | |
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287 Uint16 *buffer16; |
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288 Uint16 color; |
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289 Uint8 gradient; |
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290 |
| 0 | 291 |
| 292 /* Initialize SDL */ | |
| 293 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 294 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
| 295 exit(1); | |
| 296 } | |
| 297 atexit(SDL_Quit); | |
| 298 | |
| 299 /* Alpha blending doesn't work well at 8-bit color */ | |
| 300 info = SDL_GetVideoInfo(); | |
| 301 if ( info->vfmt->BitsPerPixel > 8 ) { | |
| 302 video_bpp = info->vfmt->BitsPerPixel; | |
| 303 } else { | |
| 304 video_bpp = 16; | |
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305 fprintf(stderr, "forced 16 bpp mode\n"); |
| 0 | 306 } |
| 307 videoflags = SDL_SWSURFACE; | |
| 308 while ( argc > 1 ) { | |
| 309 --argc; | |
| 310 if ( strcmp(argv[argc-1], "-bpp") == 0 ) { | |
| 311 video_bpp = atoi(argv[argc]); | |
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312 if (video_bpp<=8) { |
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313 video_bpp=16; |
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314 fprintf(stderr, "forced 16 bpp mode\n"); |
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315 } |
| 0 | 316 --argc; |
| 317 } else | |
| 318 if ( strcmp(argv[argc], "-hw") == 0 ) { | |
| 319 videoflags |= SDL_HWSURFACE; | |
| 320 } else | |
| 321 if ( strcmp(argv[argc], "-warp") == 0 ) { | |
| 322 videoflags |= SDL_HWPALETTE; | |
| 323 } else | |
| 324 if ( strcmp(argv[argc], "-fullscreen") == 0 ) { | |
| 325 videoflags |= SDL_FULLSCREEN; | |
| 326 } else { | |
| 327 fprintf(stderr, | |
| 328 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", | |
| 329 argv[0]); | |
| 330 exit(1); | |
| 331 } | |
| 332 } | |
| 333 | |
| 334 /* Set 640x480 video mode */ | |
| 335 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) { | |
| 336 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", | |
| 337 video_bpp, SDL_GetError()); | |
| 338 exit(2); | |
| 339 } | |
| 340 | |
| 341 /* Set the surface pixels and refresh! */ | |
| 342 if ( SDL_LockSurface(screen) < 0 ) { | |
| 343 fprintf(stderr, "Couldn't lock the display surface: %s\n", | |
| 344 SDL_GetError()); | |
| 345 exit(2); | |
| 346 } | |
| 347 buffer=(Uint8 *)screen->pixels; | |
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348 if (screen->format->BytesPerPixel!=2) { |
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349 for ( i=0; i<screen->h; ++i ) { |
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350 memset(buffer,(i*255)/screen->h, screen->pitch); |
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351 buffer += screen->pitch; |
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352 } |
| 0 | 353 } |
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354 else |
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355 { |
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356 for ( i=0; i<screen->h; ++i ) { |
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357 gradient=((i*255)/screen->h); |
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358 color = SDL_MapRGB(screen->format, gradient, gradient, gradient); |
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359 buffer16=(Uint16*)buffer; |
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360 for (k=0; k<screen->w; k++) |
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361 { |
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362 *(buffer16+k)=color; |
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363 } |
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364 buffer += screen->pitch; |
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365 } |
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366 } |
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367 |
| 0 | 368 SDL_UnlockSurface(screen); |
| 369 SDL_UpdateRect(screen, 0, 0, 0, 0); | |
| 370 | |
| 371 /* Create the light */ | |
| 372 light = CreateLight(screen, 82); | |
| 373 if ( light == NULL ) { | |
| 374 exit(1); | |
| 375 } | |
| 376 | |
| 377 /* Load the sprite */ | |
| 378 if ( LoadSprite(screen, "icon.bmp") < 0 ) { | |
| 379 SDL_FreeSurface(light); | |
| 380 exit(1); | |
| 381 } | |
| 382 | |
| 383 /* Set a clipping rectangle to clip the outside edge of the screen */ | |
| 384 { SDL_Rect clip; | |
| 385 clip.x = 32; | |
| 386 clip.y = 32; | |
| 387 clip.w = screen->w-(2*32); | |
| 388 clip.h = screen->h-(2*32); | |
| 389 SDL_SetClipRect(screen, &clip); | |
| 390 } | |
| 391 | |
| 392 /* Wait for a keystroke */ | |
| 393 lastticks = SDL_GetTicks(); | |
| 394 done = 0; | |
| 395 mouse_pressed = 0; | |
| 396 while ( !done ) { | |
| 397 /* Update the frame -- move the sprite */ | |
| 398 if ( mouse_pressed ) { | |
| 399 MoveSprite(screen, light); | |
| 400 mouse_pressed = 0; | |
| 401 } else { | |
| 402 MoveSprite(screen, NULL); | |
| 403 } | |
| 404 | |
| 405 /* Slow down the loop to 30 frames/second */ | |
| 406 ticks = SDL_GetTicks(); | |
| 407 if ( (ticks-lastticks) < FRAME_TICKS ) { | |
| 408 #ifdef CHECK_SLEEP_GRANULARITY | |
| 409 fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks)); | |
| 410 #endif | |
| 411 SDL_Delay(FRAME_TICKS-(ticks-lastticks)); | |
| 412 #ifdef CHECK_SLEEP_GRANULARITY | |
| 413 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks)); | |
| 414 #endif | |
| 415 } | |
| 416 lastticks = ticks; | |
| 417 | |
| 418 /* Check for events */ | |
| 419 while ( SDL_PollEvent(&event) ) { | |
| 420 switch (event.type) { | |
| 421 /* Attract sprite while mouse is held down */ | |
| 422 case SDL_MOUSEMOTION: | |
| 423 if (event.motion.state != 0) { | |
| 424 AttractSprite(event.motion.x, | |
| 425 event.motion.y); | |
| 426 mouse_pressed = 1; | |
| 427 } | |
| 428 break; | |
| 429 case SDL_MOUSEBUTTONDOWN: | |
| 430 if ( event.button.button == 1 ) { | |
| 431 AttractSprite(event.button.x, | |
| 432 event.button.y); | |
| 433 mouse_pressed = 1; | |
| 434 } else { | |
| 435 SDL_Rect area; | |
| 436 | |
| 437 area.x = event.button.x-16; | |
| 438 area.y = event.button.y-16; | |
| 439 area.w = 32; | |
| 440 area.h = 32; | |
| 441 SDL_FillRect(screen, &area, 0); | |
| 442 SDL_UpdateRects(screen,1,&area); | |
| 443 } | |
| 444 break; | |
| 445 case SDL_KEYDOWN: | |
| 446 /* Any keypress quits the app... */ | |
| 447 case SDL_QUIT: | |
| 448 done = 1; | |
| 449 break; | |
| 450 default: | |
| 451 break; | |
| 452 } | |
| 453 } | |
| 454 } | |
| 455 SDL_FreeSurface(light); | |
| 456 SDL_FreeSurface(sprite); | |
| 457 SDL_FreeSurface(backing); | |
| 458 | |
| 459 /* Print out some timing information */ | |
| 460 if ( flashes > 0 ) { | |
| 461 printf("%d alpha blits, ~%4.4f ms per blit\n", | |
| 462 flashes, (float)flashtime/flashes); | |
| 463 } | |
| 464 return(0); | |
| 465 } |