test/testsprite.c

   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>
   7 #include <math.h>
   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;
  21 int debug_flip;
  22 Uint16 sprite_w, sprite_h;
  23
  24 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
  25 static void quit(int rc)
  26 {
  27         SDL_Quit();
  28         exit(rc);
  29 }
  30
  31 int LoadSprite(char *file)
  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;
  78                 if ( (position->x < 0) || (position->x >= (screen->w - sprite_w)) ) {
  79                         velocity->x = -velocity->x;
  80                         position->x += velocity->x;
  81                 }
  82                 position->y += velocity->y;
  83                 if ( (position->y < 0) || (position->y >= (screen->h - sprite_w)) ) {
  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
  94         if (debug_flip) {
  95                 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
  96                         static int t = 0;
  97
  98                         Uint32 color = SDL_MapRGB (screen->format, 255, 0, 0);
  99                         SDL_Rect r;
 100                         r.x = (sin((float)t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w-20);
 101                         r.y = 0;
 102                         r.w = 20;
 103                         r.h = screen->h;
 104
 105                         SDL_FillRect (screen, &r, color);
 106                         t+=2;
 107                 }
 108         }
 109
 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 */
 120 Uint32 FastestFlags(Uint32 flags, int width, int height, int bpp)
 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                  */
 140                 if ( info->video_mem*1024 > (height*width*bpp/8) ) {
 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());
 166                 return(1);
 167         }
 168
 169         numsprites = NUM_SPRITES;
 170         videoflags = SDL_SWSURFACE|SDL_ANYFORMAT;
 171         width = 640;
 172         height = 480;
 173         video_bpp = 8;
 174         debug_flip = 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 ) {
 191                         videoflags = FastestFlags(videoflags, width, height, video_bpp);
 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
 199                 if ( strcmp(argv[argc], "-debugflip") == 0 ) {
 200                         debug_flip ^= 1;
 201                 } else
 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]);
 211                         quit(1);
 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());
 220                 quit(2);
 221         }
 222
 223         /* Load the sprite */
 224         if ( LoadSprite("icon.bmp") < 0 ) {
 225                 quit(1);
 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");
 233                 quit(2);
 234         }
 235         sprite_rects = (SDL_Rect *)mem;
 236         positions = sprite_rects;
 237         sprite_rects += numsprites;
 238         velocities = sprite_rects;
 239         sprite_rects += numsprites;
 240         sprite_w = sprite->w;
 241         sprite_h = sprite->h;
 242         srand(time(NULL));
 243         for ( i=0; i<numsprites; ++i ) {
 244                 positions[i].x = rand()%(screen->w - sprite_w);
 245                 positions[i].y = rand()%(screen->h - sprite_h);
 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) {
 298                                 case SDL_MOUSEBUTTONDOWN:
 299                                         SDL_WarpMouse(screen->w/2, screen->h/2);
 300                                         break;
 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         }
 321         SDL_Quit();
 322         return(0);
 323 }