Mercurial > sdl-ios-xcode
annotate test/testalpha.c @ 998:0e6627072f7a
Date: Wed, 24 Nov 2004 01:25:48 +0100
From: Stephane Marchesin
Subject: Re: [SDL] Problem compiling SDL 1.2.7
- there is a bug that was introduced in the kernel headers for 2.6.9
which is fixed in 2.6.10. This bug *will* byte when compiling the cdrom
subsystem. A patch that works around this bug is attached. Note that
users affected are not those running 2.6.9, but those using the 2.6.9
kernel headers for their system (i.e. whose libc is built against 2.6.9
headers).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 30 Nov 2004 14:45:08 +0000 |
| parents | 05c551e5bc64 |
| children | be9c9c8f6d53 |
| 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 | |
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383 /* Print out information about our surfaces */ |
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384 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); |
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385 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
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386 printf("Screen is in video memory\n"); |
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387 } else { |
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388 printf("Screen is in system memory\n"); |
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389 } |
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390 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { |
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391 printf("Screen has double-buffering enabled\n"); |
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392 } |
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Date: Sat, 24 Apr 2004 15:13:32 +0300
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393 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
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394 printf("Sprite is in video memory\n"); |
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395 } else { |
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396 printf("Sprite is in system memory\n"); |
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397 } |
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398 |
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399 /* Run a sample blit to trigger blit acceleration */ |
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400 { SDL_Rect dst; |
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401 dst.x = 0; |
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402 dst.y = 0; |
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403 dst.w = sprite->w; |
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404 dst.h = sprite->h; |
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405 SDL_BlitSurface(sprite, NULL, screen, &dst); |
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406 SDL_FillRect(screen, &dst, 0); |
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407 } |
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408 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
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409 printf("Sprite blit uses hardware alpha acceleration\n"); |
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410 } else { |
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411 printf("Sprite blit dosn't uses hardware alpha acceleration\n"); |
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412 } |
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413 |
| 0 | 414 /* Set a clipping rectangle to clip the outside edge of the screen */ |
| 415 { SDL_Rect clip; | |
| 416 clip.x = 32; | |
| 417 clip.y = 32; | |
| 418 clip.w = screen->w-(2*32); | |
| 419 clip.h = screen->h-(2*32); | |
| 420 SDL_SetClipRect(screen, &clip); | |
| 421 } | |
| 422 | |
| 423 /* Wait for a keystroke */ | |
| 424 lastticks = SDL_GetTicks(); | |
| 425 done = 0; | |
| 426 mouse_pressed = 0; | |
| 427 while ( !done ) { | |
| 428 /* Update the frame -- move the sprite */ | |
| 429 if ( mouse_pressed ) { | |
| 430 MoveSprite(screen, light); | |
| 431 mouse_pressed = 0; | |
| 432 } else { | |
| 433 MoveSprite(screen, NULL); | |
| 434 } | |
| 435 | |
| 436 /* Slow down the loop to 30 frames/second */ | |
| 437 ticks = SDL_GetTicks(); | |
| 438 if ( (ticks-lastticks) < FRAME_TICKS ) { | |
| 439 #ifdef CHECK_SLEEP_GRANULARITY | |
| 440 fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks)); | |
| 441 #endif | |
| 442 SDL_Delay(FRAME_TICKS-(ticks-lastticks)); | |
| 443 #ifdef CHECK_SLEEP_GRANULARITY | |
| 444 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks)); | |
| 445 #endif | |
| 446 } | |
| 447 lastticks = ticks; | |
| 448 | |
| 449 /* Check for events */ | |
| 450 while ( SDL_PollEvent(&event) ) { | |
| 451 switch (event.type) { | |
| 452 /* Attract sprite while mouse is held down */ | |
| 453 case SDL_MOUSEMOTION: | |
| 454 if (event.motion.state != 0) { | |
| 455 AttractSprite(event.motion.x, | |
| 456 event.motion.y); | |
| 457 mouse_pressed = 1; | |
| 458 } | |
| 459 break; | |
| 460 case SDL_MOUSEBUTTONDOWN: | |
| 461 if ( event.button.button == 1 ) { | |
| 462 AttractSprite(event.button.x, | |
| 463 event.button.y); | |
| 464 mouse_pressed = 1; | |
| 465 } else { | |
| 466 SDL_Rect area; | |
| 467 | |
| 468 area.x = event.button.x-16; | |
| 469 area.y = event.button.y-16; | |
| 470 area.w = 32; | |
| 471 area.h = 32; | |
| 472 SDL_FillRect(screen, &area, 0); | |
| 473 SDL_UpdateRects(screen,1,&area); | |
| 474 } | |
| 475 break; | |
| 476 case SDL_KEYDOWN: | |
| 477 /* Any keypress quits the app... */ | |
| 478 case SDL_QUIT: | |
| 479 done = 1; | |
| 480 break; | |
| 481 default: | |
| 482 break; | |
| 483 } | |
| 484 } | |
| 485 } | |
| 486 SDL_FreeSurface(light); | |
| 487 SDL_FreeSurface(sprite); | |
| 488 SDL_FreeSurface(backing); | |
| 489 | |
| 490 /* Print out some timing information */ | |
| 491 if ( flashes > 0 ) { | |
| 492 printf("%d alpha blits, ~%4.4f ms per blit\n", | |
| 493 flashes, (float)flashtime/flashes); | |
| 494 } | |
| 495 return(0); | |
| 496 } |