Mercurial > sdl-ios-xcode
annotate test/testpalette.c @ 3972:590d6f5da52b SDL-1.2
Fixed assembler command line for older yasm releases and documented nasm
switches.
Fixes Bugzilla #440.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sat, 16 Jun 2007 05:51:51 +0000 |
| parents | 871090feb7ad |
| children | 782fd950bd46 c121d94672cb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * testpalette.c | |
| 3 * | |
| 4 * A simple test of runtime palette modification for animation | |
| 5 * (using the SDL_SetPalette() API). | |
| 6 */ | |
| 7 | |
| 8 #include <stdio.h> | |
| 9 #include <stdlib.h> | |
| 10 #include <string.h> | |
| 11 #include <math.h> | |
| 12 | |
| 13 /* This isn't in the Windows headers */ | |
| 14 #ifndef M_PI | |
| 15 #define M_PI 3.14159265358979323846 | |
| 16 #endif | |
| 17 | |
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18 #include "SDL.h" |
| 0 | 19 |
| 20 /* screen size */ | |
| 21 #define SCRW 640 | |
| 22 #define SCRH 480 | |
| 23 | |
| 24 #define NBOATS 5 | |
| 25 #define SPEED 2 | |
| 26 | |
| 27 #ifndef MIN | |
| 28 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 29 #endif | |
| 30 #ifndef MAX | |
| 31 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 32 #endif | |
| 33 | |
| 34 /* | |
| 35 * wave colours: Made by taking a narrow cross-section of a wave picture | |
| 36 * in Gimp, saving in PPM ascii format and formatting with Emacs macros. | |
| 37 */ | |
| 38 static SDL_Color wavemap[] = { | |
| 39 {0,2,103}, {0,7,110}, {0,13,117}, {0,19,125}, | |
| 40 {0,25,133}, {0,31,141}, {0,37,150}, {0,43,158}, | |
| 41 {0,49,166}, {0,55,174}, {0,61,182}, {0,67,190}, | |
| 42 {0,73,198}, {0,79,206}, {0,86,214}, {0,96,220}, | |
| 43 {5,105,224}, {12,112,226}, {19,120,227}, {26,128,229}, | |
| 44 {33,135,230}, {40,143,232}, {47,150,234}, {54,158,236}, | |
| 45 {61,165,238}, {68,173,239}, {75,180,241}, {82,188,242}, | |
| 46 {89,195,244}, {96,203,246}, {103,210,248}, {112,218,250}, | |
| 47 {124,224,250}, {135,226,251}, {146,229,251}, {156,231,252}, | |
| 48 {167,233,252}, {178,236,252}, {189,238,252}, {200,240,252}, | |
| 49 {211,242,252}, {222,244,252}, {233,247,252}, {242,249,252}, | |
| 50 {237,250,252}, {209,251,252}, {174,251,252}, {138,252,252}, | |
| 51 {102,251,252}, {63,250,252}, {24,243,252}, {7,225,252}, | |
| 52 {4,203,252}, {3,181,252}, {2,158,252}, {1,136,251}, | |
| 53 {0,111,248}, {0,82,234}, {0,63,213}, {0,50,192}, | |
| 54 {0,39,172}, {0,28,152}, {0,17,132}, {0,7,114} | |
| 55 }; | |
| 56 | |
|
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57 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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58 static void quit(int rc) |
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59 { |
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60 SDL_Quit(); |
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61 exit(rc); |
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62 } |
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63 |
| 0 | 64 static void sdlerr(char *when) |
| 65 { | |
| 66 fprintf(stderr, "SDL error: %s: %s\n", when, SDL_GetError()); | |
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67 quit(1); |
| 0 | 68 } |
| 69 | |
| 70 /* create a background surface */ | |
| 71 static SDL_Surface *make_bg(SDL_Surface *screen, int startcol) | |
| 72 { | |
| 73 int i; | |
| 74 SDL_Surface *bg = SDL_CreateRGBSurface(SDL_SWSURFACE, screen->w, screen->h, | |
| 75 8, 0, 0, 0, 0); | |
| 76 if(!bg) | |
| 77 sdlerr("creating background surface"); | |
| 78 | |
| 79 /* set the palette to the logical screen palette so that blits | |
| 80 won't be translated */ | |
| 81 SDL_SetColors(bg, screen->format->palette->colors, 0, 256); | |
| 82 | |
| 83 /* Make a wavy background pattern using colours 0-63 */ | |
| 84 if(SDL_LockSurface(bg) < 0) | |
| 85 sdlerr("locking background"); | |
| 86 for(i = 0; i < SCRH; i++) { | |
| 87 Uint8 *p = (Uint8 *)bg->pixels + i * bg->pitch; | |
| 88 int j, d; | |
| 89 d = 0; | |
| 90 for(j = 0; j < SCRW; j++) { | |
| 91 int v = MAX(d, -2); | |
| 92 v = MIN(v, 2); | |
| 93 if(i > 0) | |
| 94 v += p[-bg->pitch] + 65 - startcol; | |
| 95 p[j] = startcol + (v & 63); | |
| 96 d += ((rand() >> 3) % 3) - 1; | |
| 97 } | |
| 98 } | |
| 99 SDL_UnlockSurface(bg); | |
| 100 return(bg); | |
| 101 } | |
| 102 | |
| 103 /* | |
| 104 * Return a surface flipped horisontally. Only works for 8bpp; | |
| 105 * extension to arbitrary bitness is left as an exercise for the reader. | |
| 106 */ | |
| 107 static SDL_Surface *hflip(SDL_Surface *s) | |
| 108 { | |
| 109 int i; | |
| 110 SDL_Surface *z = SDL_CreateRGBSurface(SDL_SWSURFACE, s->w, s->h, 8, | |
| 111 0, 0, 0, 0); | |
| 112 /* copy palette */ | |
| 113 SDL_SetColors(z, s->format->palette->colors, | |
| 114 0, s->format->palette->ncolors); | |
| 115 if(SDL_LockSurface(s) < 0 || SDL_LockSurface(z) < 0) | |
| 116 sdlerr("locking flip images"); | |
| 117 | |
| 118 for(i = 0; i < s->h; i++) { | |
| 119 int j; | |
| 120 Uint8 *from = (Uint8 *)s->pixels + i * s->pitch; | |
| 121 Uint8 *to = (Uint8 *)z->pixels + i * z->pitch + s->w - 1; | |
| 122 for(j = 0; j < s->w; j++) | |
| 123 to[-j] = from[j]; | |
| 124 } | |
| 125 | |
| 126 SDL_UnlockSurface(z); | |
| 127 SDL_UnlockSurface(s); | |
| 128 return z; | |
| 129 } | |
| 130 | |
| 131 int main(int argc, char **argv) | |
| 132 { | |
| 133 SDL_Color cmap[256]; | |
| 134 SDL_Surface *screen; | |
| 135 SDL_Surface *bg; | |
| 136 SDL_Surface *boat[2]; | |
| 137 unsigned vidflags = 0; | |
| 138 unsigned start; | |
| 139 int fade_max = 400; | |
| 140 int fade_level, fade_dir; | |
| 141 int boatcols, frames, i, red; | |
| 142 int boatx[NBOATS], boaty[NBOATS], boatdir[NBOATS]; | |
| 143 int gamma_fade = 0; | |
| 144 int gamma_ramp = 0; | |
| 145 | |
| 146 if(SDL_Init(SDL_INIT_VIDEO) < 0) | |
| 147 sdlerr("initialising SDL"); | |
| 148 | |
| 149 while(--argc) { | |
| 150 ++argv; | |
| 151 if(strcmp(*argv, "-hw") == 0) | |
| 152 vidflags |= SDL_HWSURFACE; | |
| 153 else if(strcmp(*argv, "-fullscreen") == 0) | |
| 154 vidflags |= SDL_FULLSCREEN; | |
| 155 else if(strcmp(*argv, "-nofade") == 0) | |
| 156 fade_max = 1; | |
| 157 else if(strcmp(*argv, "-gamma") == 0) | |
| 158 gamma_fade = 1; | |
| 159 else if(strcmp(*argv, "-gammaramp") == 0) | |
| 160 gamma_ramp = 1; | |
| 161 else { | |
| 162 fprintf(stderr, | |
| 163 "usage: testpalette " | |
| 164 " [-hw] [-fullscreen] [-nofade] [-gamma] [-gammaramp]\n"); | |
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parents:
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165 quit(1); |
| 0 | 166 } |
| 167 } | |
| 168 | |
| 169 /* Ask explicitly for 8bpp and a hardware palette */ | |
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170 if((screen = SDL_SetVideoMode(SCRW, SCRH, 8, vidflags | SDL_HWPALETTE)) == NULL) { |
| 0 | 171 fprintf(stderr, "error setting %dx%d 8bpp indexed mode: %s\n", |
| 172 SCRW, SCRH, SDL_GetError()); | |
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173 quit(1); |
| 0 | 174 } |
| 175 | |
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176 if (vidflags & SDL_FULLSCREEN) SDL_ShowCursor (SDL_FALSE); |
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177 |
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178 if((boat[0] = SDL_LoadBMP("sail.bmp")) == NULL) |
| 0 | 179 sdlerr("loading sail.bmp"); |
| 180 /* We've chosen magenta (#ff00ff) as colour key for the boat */ | |
| 181 SDL_SetColorKey(boat[0], SDL_SRCCOLORKEY | SDL_RLEACCEL, | |
| 182 SDL_MapRGB(boat[0]->format, 0xff, 0x00, 0xff)); | |
| 183 boatcols = boat[0]->format->palette->ncolors; | |
| 184 boat[1] = hflip(boat[0]); | |
| 185 SDL_SetColorKey(boat[1], SDL_SRCCOLORKEY | SDL_RLEACCEL, | |
| 186 SDL_MapRGB(boat[1]->format, 0xff, 0x00, 0xff)); | |
| 187 | |
| 188 /* | |
| 189 * First set the physical screen palette to black, so the user won't | |
| 190 * see our initial drawing on the screen. | |
| 191 */ | |
| 192 memset(cmap, 0, sizeof(cmap)); | |
| 193 SDL_SetPalette(screen, SDL_PHYSPAL, cmap, 0, 256); | |
| 194 | |
| 195 /* | |
| 196 * Proper palette management is important when playing games with the | |
| 197 * colormap. We have divided the palette as follows: | |
| 198 * | |
| 199 * index 0..(boatcols-1): used for the boat | |
| 200 * index boatcols..(boatcols+63): used for the waves | |
| 201 */ | |
| 202 SDL_SetPalette(screen, SDL_LOGPAL, | |
| 203 boat[0]->format->palette->colors, 0, boatcols); | |
| 204 SDL_SetPalette(screen, SDL_LOGPAL, wavemap, boatcols, 64); | |
| 205 | |
| 206 /* | |
| 207 * Now the logical screen palette is set, and will remain unchanged. | |
| 208 * The boats already have the same palette so fast blits can be used. | |
| 209 */ | |
| 210 memcpy(cmap, screen->format->palette->colors, 256 * sizeof(SDL_Color)); | |
| 211 | |
| 212 /* save the index of the red colour for later */ | |
| 213 red = SDL_MapRGB(screen->format, 0xff, 0x00, 0x00); | |
| 214 | |
| 215 bg = make_bg(screen, boatcols); /* make a nice wavy background surface */ | |
| 216 | |
| 217 /* initial screen contents */ | |
| 218 if(SDL_BlitSurface(bg, NULL, screen, NULL) < 0) | |
| 219 sdlerr("blitting background to screen"); | |
| 220 SDL_Flip(screen); /* actually put the background on screen */ | |
| 221 | |
| 222 /* determine initial boat placements */ | |
| 223 for(i = 0; i < NBOATS; i++) { | |
| 224 boatx[i] = (rand() % (SCRW + boat[0]->w)) - boat[0]->w; | |
| 225 boaty[i] = i * (SCRH - boat[0]->h) / (NBOATS - 1); | |
| 226 boatdir[i] = ((rand() >> 5) & 1) * 2 - 1; | |
| 227 } | |
| 228 | |
| 229 start = SDL_GetTicks(); | |
| 230 frames = 0; | |
| 231 fade_dir = 1; | |
| 232 fade_level = 0; | |
| 233 do { | |
| 234 SDL_Event e; | |
| 235 SDL_Rect updates[NBOATS]; | |
| 236 SDL_Rect r; | |
| 237 int redphase; | |
| 238 | |
| 239 /* A small event loop: just exit on any key or mouse button event */ | |
| 240 while(SDL_PollEvent(&e)) { | |
| 241 if(e.type == SDL_KEYDOWN || e.type == SDL_QUIT | |
| 242 || e.type == SDL_MOUSEBUTTONDOWN) { | |
| 243 if(fade_dir < 0) | |
| 244 fade_level = 0; | |
| 245 fade_dir = -1; | |
| 246 } | |
| 247 } | |
| 248 | |
| 249 /* move boats */ | |
| 250 for(i = 0; i < NBOATS; i++) { | |
| 251 int old_x = boatx[i]; | |
| 252 /* update boat position */ | |
| 253 boatx[i] += boatdir[i] * SPEED; | |
| 254 if(boatx[i] <= -boat[0]->w || boatx[i] >= SCRW) | |
| 255 boatdir[i] = -boatdir[i]; | |
| 256 | |
| 257 /* paint over the old boat position */ | |
| 258 r.x = old_x; | |
| 259 r.y = boaty[i]; | |
| 260 r.w = boat[0]->w; | |
| 261 r.h = boat[0]->h; | |
| 262 if(SDL_BlitSurface(bg, &r, screen, &r) < 0) | |
| 263 sdlerr("blitting background"); | |
| 264 | |
| 265 /* construct update rectangle (bounding box of old and new pos) */ | |
| 266 updates[i].x = MIN(old_x, boatx[i]); | |
| 267 updates[i].y = boaty[i]; | |
| 268 updates[i].w = boat[0]->w + SPEED; | |
| 269 updates[i].h = boat[0]->h; | |
| 270 /* clip update rectangle to screen */ | |
| 271 if(updates[i].x < 0) { | |
| 272 updates[i].w += updates[i].x; | |
| 273 updates[i].x = 0; | |
| 274 } | |
| 275 if(updates[i].x + updates[i].w > SCRW) | |
| 276 updates[i].w = SCRW - updates[i].x; | |
| 277 } | |
| 278 | |
| 279 for(i = 0; i < NBOATS; i++) { | |
| 280 /* paint boat on new position */ | |
| 281 r.x = boatx[i]; | |
| 282 r.y = boaty[i]; | |
| 283 if(SDL_BlitSurface(boat[(boatdir[i] + 1) / 2], NULL, | |
| 284 screen, &r) < 0) | |
| 285 sdlerr("blitting boat"); | |
| 286 } | |
| 287 | |
| 288 /* cycle wave palette */ | |
| 289 for(i = 0; i < 64; i++) | |
| 290 cmap[boatcols + ((i + frames) & 63)] = wavemap[i]; | |
| 291 | |
| 292 if(fade_dir) { | |
| 293 /* Fade the entire palette in/out */ | |
| 294 fade_level += fade_dir; | |
| 295 | |
| 296 if(gamma_fade) { | |
| 297 /* Fade linearly in gamma level (lousy) */ | |
| 298 float level = (float)fade_level / fade_max; | |
| 299 if(SDL_SetGamma(level, level, level) < 0) | |
| 300 sdlerr("setting gamma"); | |
| 301 | |
| 302 } else if(gamma_ramp) { | |
| 303 /* Fade using gamma ramp (better) */ | |
| 304 Uint16 ramp[256]; | |
| 305 for(i = 0; i < 256; i++) | |
| 306 ramp[i] = (i * fade_level / fade_max) << 8; | |
| 307 if(SDL_SetGammaRamp(ramp, ramp, ramp) < 0) | |
| 308 sdlerr("setting gamma ramp"); | |
| 309 | |
| 310 } else { | |
| 311 /* Fade using direct palette manipulation (best) */ | |
| 312 memcpy(cmap, screen->format->palette->colors, | |
| 313 boatcols * sizeof(SDL_Color)); | |
| 314 for(i = 0; i < boatcols + 64; i++) { | |
| 315 cmap[i].r = cmap[i].r * fade_level / fade_max; | |
| 316 cmap[i].g = cmap[i].g * fade_level / fade_max; | |
| 317 cmap[i].b = cmap[i].b * fade_level / fade_max; | |
| 318 } | |
| 319 } | |
| 320 if(fade_level == fade_max) | |
| 321 fade_dir = 0; | |
| 322 } | |
| 323 | |
| 324 /* pulse the red colour (done after the fade, for a night effect) */ | |
| 325 redphase = frames % 64; | |
| 326 cmap[red].r = (int)(255 * sin(redphase * M_PI / 63)); | |
| 327 | |
| 328 SDL_SetPalette(screen, SDL_PHYSPAL, cmap, 0, boatcols + 64); | |
| 329 | |
| 330 /* update changed areas of the screen */ | |
| 331 SDL_UpdateRects(screen, NBOATS, updates); | |
| 332 frames++; | |
| 333 } while(fade_level > 0); | |
| 334 | |
| 335 printf("%d frames, %.2f fps\n", | |
| 336 frames, 1000.0 * frames / (SDL_GetTicks() - start)); | |
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parents:
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diff
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337 |
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338 if (vidflags & SDL_FULLSCREEN) SDL_ShowCursor (SDL_TRUE); |
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339 SDL_Quit(); |
| 0 | 340 return 0; |
| 341 } | |
| 342 |