Mercurial > sdl-ios-xcode
annotate test/testsprite.c @ 4003:ea059917233c SDL-1.2
Added notes about audio callback behaviour.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 05 Jul 2007 02:53:40 +0000 |
| parents | 4d241ea8a1cd |
| children | 782fd950bd46 c121d94672cb |
| rev | line source |
|---|---|
| 0 | 1 /* Simple program: Move N sprites around on the screen as fast as possible */ |
| 2 | |
| 3 #include <stdio.h> | |
| 4 #include <stdlib.h> | |
| 5 #include <string.h> | |
| 6 #include <ctype.h> | |
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7 #include <math.h> |
| 0 | 8 #include <time.h> |
| 9 | |
| 10 #include "SDL.h" | |
| 11 | |
| 12 #define NUM_SPRITES 100 | |
| 13 #define MAX_SPEED 1 | |
| 14 | |
| 15 SDL_Surface *sprite; | |
| 16 int numsprites; | |
| 17 SDL_Rect *sprite_rects; | |
| 18 SDL_Rect *positions; | |
| 19 SDL_Rect *velocities; | |
| 20 int sprites_visible; | |
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21 int debug_flip; |
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22 Uint16 sprite_w, sprite_h; |
| 0 | 23 |
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24 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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parents:
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25 static void quit(int rc) |
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26 { |
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27 SDL_Quit(); |
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28 exit(rc); |
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parents:
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29 } |
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30 |
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31 int LoadSprite(char *file) |
| 0 | 32 { |
| 33 SDL_Surface *temp; | |
| 34 | |
| 35 /* Load the sprite image */ | |
| 36 sprite = SDL_LoadBMP(file); | |
| 37 if ( sprite == NULL ) { | |
| 38 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); | |
| 39 return(-1); | |
| 40 } | |
| 41 | |
| 42 /* Set transparent pixel as the pixel at (0,0) */ | |
| 43 if ( sprite->format->palette ) { | |
| 44 SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY|SDL_RLEACCEL), | |
| 45 *(Uint8 *)sprite->pixels); | |
| 46 } | |
| 47 | |
| 48 /* Convert sprite to video format */ | |
| 49 temp = SDL_DisplayFormat(sprite); | |
| 50 SDL_FreeSurface(sprite); | |
| 51 if ( temp == NULL ) { | |
| 52 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 53 SDL_GetError()); | |
| 54 return(-1); | |
| 55 } | |
| 56 sprite = temp; | |
| 57 | |
| 58 /* We're ready to roll. :) */ | |
| 59 return(0); | |
| 60 } | |
| 61 | |
| 62 void MoveSprites(SDL_Surface *screen, Uint32 background) | |
| 63 { | |
| 64 int i, nupdates; | |
| 65 SDL_Rect area, *position, *velocity; | |
| 66 | |
| 67 nupdates = 0; | |
| 68 /* Erase all the sprites if necessary */ | |
| 69 if ( sprites_visible ) { | |
| 70 SDL_FillRect(screen, NULL, background); | |
| 71 } | |
| 72 | |
| 73 /* Move the sprite, bounce at the wall, and draw */ | |
| 74 for ( i=0; i<numsprites; ++i ) { | |
| 75 position = &positions[i]; | |
| 76 velocity = &velocities[i]; | |
| 77 position->x += velocity->x; | |
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78 if ( (position->x < 0) || (position->x >= (screen->w - sprite_w)) ) { |
| 0 | 79 velocity->x = -velocity->x; |
| 80 position->x += velocity->x; | |
| 81 } | |
| 82 position->y += velocity->y; | |
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83 if ( (position->y < 0) || (position->y >= (screen->h - sprite_w)) ) { |
| 0 | 84 velocity->y = -velocity->y; |
| 85 position->y += velocity->y; | |
| 86 } | |
| 87 | |
| 88 /* Blit the sprite onto the screen */ | |
| 89 area = *position; | |
| 90 SDL_BlitSurface(sprite, NULL, screen, &area); | |
| 91 sprite_rects[nupdates++] = area; | |
| 92 } | |
| 93 | |
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94 if (debug_flip) { |
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95 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { |
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96 static int t = 0; |
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97 |
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98 Uint32 color = SDL_MapRGB (screen->format, 255, 0, 0); |
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99 SDL_Rect r; |
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100 r.x = (sin((float)t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w-20); |
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101 r.y = 0; |
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parents:
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102 r.w = 20; |
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103 r.h = screen->h; |
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104 |
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105 SDL_FillRect (screen, &r, color); |
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106 t+=2; |
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107 } |
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108 } |
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parents:
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109 |
| 0 | 110 /* Update the screen! */ |
| 111 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { | |
| 112 SDL_Flip(screen); | |
| 113 } else { | |
| 114 SDL_UpdateRects(screen, nupdates, sprite_rects); | |
| 115 } | |
| 116 sprites_visible = 1; | |
| 117 } | |
| 118 | |
| 119 /* This is a way of telling whether or not to use hardware surfaces */ | |
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120 Uint32 FastestFlags(Uint32 flags, int width, int height, int bpp) |
| 0 | 121 { |
| 122 const SDL_VideoInfo *info; | |
| 123 | |
| 124 /* Hardware acceleration is only used in fullscreen mode */ | |
| 125 flags |= SDL_FULLSCREEN; | |
| 126 | |
| 127 /* Check for various video capabilities */ | |
| 128 info = SDL_GetVideoInfo(); | |
| 129 if ( info->blit_hw_CC && info->blit_fill ) { | |
| 130 /* We use accelerated colorkeying and color filling */ | |
| 131 flags |= SDL_HWSURFACE; | |
| 132 } | |
| 133 /* If we have enough video memory, and will use accelerated | |
| 134 blits directly to it, then use page flipping. | |
| 135 */ | |
| 136 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 137 /* Direct hardware blitting without double-buffering | |
| 138 causes really bad flickering. | |
| 139 */ | |
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140 if ( info->video_mem*1024 > (height*width*bpp/8) ) { |
| 0 | 141 flags |= SDL_DOUBLEBUF; |
| 142 } else { | |
| 143 flags &= ~SDL_HWSURFACE; | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 /* Return the flags */ | |
| 148 return(flags); | |
| 149 } | |
| 150 | |
| 151 int main(int argc, char *argv[]) | |
| 152 { | |
| 153 SDL_Surface *screen; | |
| 154 Uint8 *mem; | |
| 155 int width, height; | |
| 156 Uint8 video_bpp; | |
| 157 Uint32 videoflags; | |
| 158 Uint32 background; | |
| 159 int i, done; | |
| 160 SDL_Event event; | |
| 161 Uint32 then, now, frames; | |
| 162 | |
| 163 /* Initialize SDL */ | |
| 164 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 165 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
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166 return(1); |
| 0 | 167 } |
| 168 | |
| 169 numsprites = NUM_SPRITES; | |
| 170 videoflags = SDL_SWSURFACE|SDL_ANYFORMAT; | |
| 171 width = 640; | |
| 172 height = 480; | |
| 173 video_bpp = 8; | |
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174 debug_flip = 0; |
| 0 | 175 while ( argc > 1 ) { |
| 176 --argc; | |
| 177 if ( strcmp(argv[argc-1], "-width") == 0 ) { | |
| 178 width = atoi(argv[argc]); | |
| 179 --argc; | |
| 180 } else | |
| 181 if ( strcmp(argv[argc-1], "-height") == 0 ) { | |
| 182 height = atoi(argv[argc]); | |
| 183 --argc; | |
| 184 } else | |
| 185 if ( strcmp(argv[argc-1], "-bpp") == 0 ) { | |
| 186 video_bpp = atoi(argv[argc]); | |
| 187 videoflags &= ~SDL_ANYFORMAT; | |
| 188 --argc; | |
| 189 } else | |
| 190 if ( strcmp(argv[argc], "-fast") == 0 ) { | |
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191 videoflags = FastestFlags(videoflags, width, height, video_bpp); |
| 0 | 192 } else |
| 193 if ( strcmp(argv[argc], "-hw") == 0 ) { | |
| 194 videoflags ^= SDL_HWSURFACE; | |
| 195 } else | |
| 196 if ( strcmp(argv[argc], "-flip") == 0 ) { | |
| 197 videoflags ^= SDL_DOUBLEBUF; | |
| 198 } else | |
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199 if ( strcmp(argv[argc], "-debugflip") == 0 ) { |
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200 debug_flip ^= 1; |
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201 } else |
| 0 | 202 if ( strcmp(argv[argc], "-fullscreen") == 0 ) { |
| 203 videoflags ^= SDL_FULLSCREEN; | |
| 204 } else | |
| 205 if ( isdigit(argv[argc][0]) ) { | |
| 206 numsprites = atoi(argv[argc]); | |
| 207 } else { | |
| 208 fprintf(stderr, | |
| 209 "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n", | |
| 210 argv[0]); | |
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211 quit(1); |
| 0 | 212 } |
| 213 } | |
| 214 | |
| 215 /* Set video mode */ | |
| 216 screen = SDL_SetVideoMode(width, height, video_bpp, videoflags); | |
| 217 if ( ! screen ) { | |
| 218 fprintf(stderr, "Couldn't set %dx%d video mode: %s\n", | |
| 219 width, height, SDL_GetError()); | |
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220 quit(2); |
| 0 | 221 } |
| 222 | |
| 223 /* Load the sprite */ | |
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224 if ( LoadSprite("icon.bmp") < 0 ) { |
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225 quit(1); |
| 0 | 226 } |
| 227 | |
| 228 /* Allocate memory for the sprite info */ | |
| 229 mem = (Uint8 *)malloc(4*sizeof(SDL_Rect)*numsprites); | |
| 230 if ( mem == NULL ) { | |
| 231 SDL_FreeSurface(sprite); | |
| 232 fprintf(stderr, "Out of memory!\n"); | |
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233 quit(2); |
| 0 | 234 } |
| 235 sprite_rects = (SDL_Rect *)mem; | |
| 236 positions = sprite_rects; | |
| 237 sprite_rects += numsprites; | |
| 238 velocities = sprite_rects; | |
| 239 sprite_rects += numsprites; | |
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240 sprite_w = sprite->w; |
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241 sprite_h = sprite->h; |
| 0 | 242 srand(time(NULL)); |
| 243 for ( i=0; i<numsprites; ++i ) { | |
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244 positions[i].x = rand()%(screen->w - sprite_w); |
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245 positions[i].y = rand()%(screen->h - sprite_h); |
| 0 | 246 positions[i].w = sprite->w; |
| 247 positions[i].h = sprite->h; | |
| 248 velocities[i].x = 0; | |
| 249 velocities[i].y = 0; | |
| 250 while ( ! velocities[i].x && ! velocities[i].y ) { | |
| 251 velocities[i].x = (rand()%(MAX_SPEED*2+1))-MAX_SPEED; | |
| 252 velocities[i].y = (rand()%(MAX_SPEED*2+1))-MAX_SPEED; | |
| 253 } | |
| 254 } | |
| 255 background = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00); | |
| 256 | |
| 257 /* Print out information about our surfaces */ | |
| 258 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); | |
| 259 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 260 printf("Screen is in video memory\n"); | |
| 261 } else { | |
| 262 printf("Screen is in system memory\n"); | |
| 263 } | |
| 264 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { | |
| 265 printf("Screen has double-buffering enabled\n"); | |
| 266 } | |
| 267 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 268 printf("Sprite is in video memory\n"); | |
| 269 } else { | |
| 270 printf("Sprite is in system memory\n"); | |
| 271 } | |
| 272 /* Run a sample blit to trigger blit acceleration */ | |
| 273 { SDL_Rect dst; | |
| 274 dst.x = 0; | |
| 275 dst.y = 0; | |
| 276 dst.w = sprite->w; | |
| 277 dst.h = sprite->h; | |
| 278 SDL_BlitSurface(sprite, NULL, screen, &dst); | |
| 279 SDL_FillRect(screen, &dst, background); | |
| 280 } | |
| 281 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 282 printf("Sprite blit uses hardware acceleration\n"); | |
| 283 } | |
| 284 if ( (sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 285 printf("Sprite blit uses RLE acceleration\n"); | |
| 286 } | |
| 287 | |
| 288 /* Loop, blitting sprites and waiting for a keystroke */ | |
| 289 frames = 0; | |
| 290 then = SDL_GetTicks(); | |
| 291 done = 0; | |
| 292 sprites_visible = 0; | |
| 293 while ( !done ) { | |
| 294 /* Check for events */ | |
| 295 ++frames; | |
| 296 while ( SDL_PollEvent(&event) ) { | |
| 297 switch (event.type) { | |
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298 case SDL_MOUSEBUTTONDOWN: |
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299 SDL_WarpMouse(screen->w/2, screen->h/2); |
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300 break; |
| 0 | 301 case SDL_KEYDOWN: |
| 302 /* Any keypress quits the app... */ | |
| 303 case SDL_QUIT: | |
| 304 done = 1; | |
| 305 break; | |
| 306 default: | |
| 307 break; | |
| 308 } | |
| 309 } | |
| 310 MoveSprites(screen, background); | |
| 311 } | |
| 312 SDL_FreeSurface(sprite); | |
| 313 free(mem); | |
| 314 | |
| 315 /* Print out some timing information */ | |
| 316 now = SDL_GetTicks(); | |
| 317 if ( now > then ) { | |
| 318 printf("%2.2f frames per second\n", | |
| 319 ((double)frames*1000)/(now-then)); | |
| 320 } | |
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321 SDL_Quit(); |
| 0 | 322 return(0); |
| 323 } |