Mercurial > sdl-ios-xcode
annotate test/testsprite.c @ 1199:2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
To: sdl@libsdl.org
Date: Sun, 11 Dec 2005 22:57:37 -0500
Subject: [SDL] exec stack in libsdl update
i posted back in September a patch to remove executable stacks:
http://www.devolution.com/pipermail/sdl/2005-September/070626.html
later in November, a similar patch was merged it seems:
http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm
however, this lacks the additional output format checks that i posted in my
patch ... this isnt a problem if the hermes asm code is only ever used to
produce ELF objects, but if this is not true, then the additional checks in
my original patch will need to be merged
-mike
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 12 Dec 2005 09:13:12 +0000 |
| parents | be9c9c8f6d53 |
| children | 31103dbf1c26 |
| 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 | |
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12 #define DEBUG_FLIP 1 |
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13 |
| 0 | 14 #define NUM_SPRITES 100 |
| 15 #define MAX_SPEED 1 | |
| 16 | |
| 17 SDL_Surface *sprite; | |
| 18 int numsprites; | |
| 19 SDL_Rect *sprite_rects; | |
| 20 SDL_Rect *positions; | |
| 21 SDL_Rect *velocities; | |
| 22 int sprites_visible; | |
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23 Uint16 sprite_w, sprite_h; |
| 0 | 24 |
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25 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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26 static void quit(int rc) |
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27 { |
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28 SDL_Quit(); |
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29 exit(rc); |
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30 } |
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31 |
| 0 | 32 int LoadSprite(SDL_Surface *screen, char *file) |
| 33 { | |
| 34 SDL_Surface *temp; | |
| 35 | |
| 36 /* Load the sprite image */ | |
| 37 sprite = SDL_LoadBMP(file); | |
| 38 if ( sprite == NULL ) { | |
| 39 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); | |
| 40 return(-1); | |
| 41 } | |
| 42 | |
| 43 /* Set transparent pixel as the pixel at (0,0) */ | |
| 44 if ( sprite->format->palette ) { | |
| 45 SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY|SDL_RLEACCEL), | |
| 46 *(Uint8 *)sprite->pixels); | |
| 47 } | |
| 48 | |
| 49 /* Convert sprite to video format */ | |
| 50 temp = SDL_DisplayFormat(sprite); | |
| 51 SDL_FreeSurface(sprite); | |
| 52 if ( temp == NULL ) { | |
| 53 fprintf(stderr, "Couldn't convert background: %s\n", | |
| 54 SDL_GetError()); | |
| 55 return(-1); | |
| 56 } | |
| 57 sprite = temp; | |
| 58 | |
| 59 /* We're ready to roll. :) */ | |
| 60 return(0); | |
| 61 } | |
| 62 | |
| 63 void MoveSprites(SDL_Surface *screen, Uint32 background) | |
| 64 { | |
| 65 int i, nupdates; | |
| 66 SDL_Rect area, *position, *velocity; | |
| 67 | |
| 68 nupdates = 0; | |
| 69 /* Erase all the sprites if necessary */ | |
| 70 if ( sprites_visible ) { | |
| 71 SDL_FillRect(screen, NULL, background); | |
| 72 } | |
| 73 | |
| 74 /* Move the sprite, bounce at the wall, and draw */ | |
| 75 for ( i=0; i<numsprites; ++i ) { | |
| 76 position = &positions[i]; | |
| 77 velocity = &velocities[i]; | |
| 78 position->x += velocity->x; | |
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79 if ( (position->x < 0) || (position->x >= (screen->w - sprite_w)) ) { |
| 0 | 80 velocity->x = -velocity->x; |
| 81 position->x += velocity->x; | |
| 82 } | |
| 83 position->y += velocity->y; | |
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84 if ( (position->y < 0) || (position->y >= (screen->h - sprite_w)) ) { |
| 0 | 85 velocity->y = -velocity->y; |
| 86 position->y += velocity->y; | |
| 87 } | |
| 88 | |
| 89 /* Blit the sprite onto the screen */ | |
| 90 area = *position; | |
| 91 SDL_BlitSurface(sprite, NULL, screen, &area); | |
| 92 sprite_rects[nupdates++] = area; | |
| 93 } | |
| 94 | |
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95 #if DEBUG_FLIP |
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96 { |
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97 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { |
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98 static int t = 0; |
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99 |
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100 Uint32 color = SDL_MapRGB (screen->format, 255, 0, 0); |
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101 SDL_Rect r; |
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102 r.x = (sin((float)t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w-20); |
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103 r.y = 0; |
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104 r.w = 20; |
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105 r.h = screen->h; |
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106 |
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107 SDL_FillRect (screen, &r, color); |
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108 t+=2; |
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109 } |
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110 } |
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111 #endif |
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112 |
| 0 | 113 /* Update the screen! */ |
| 114 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { | |
| 115 SDL_Flip(screen); | |
| 116 } else { | |
| 117 SDL_UpdateRects(screen, nupdates, sprite_rects); | |
| 118 } | |
| 119 sprites_visible = 1; | |
| 120 } | |
| 121 | |
| 122 /* This is a way of telling whether or not to use hardware surfaces */ | |
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123 Uint32 FastestFlags(Uint32 flags, int width, int height, int bpp) |
| 0 | 124 { |
| 125 const SDL_VideoInfo *info; | |
| 126 | |
| 127 /* Hardware acceleration is only used in fullscreen mode */ | |
| 128 flags |= SDL_FULLSCREEN; | |
| 129 | |
| 130 /* Check for various video capabilities */ | |
| 131 info = SDL_GetVideoInfo(); | |
| 132 if ( info->blit_hw_CC && info->blit_fill ) { | |
| 133 /* We use accelerated colorkeying and color filling */ | |
| 134 flags |= SDL_HWSURFACE; | |
| 135 } | |
| 136 /* If we have enough video memory, and will use accelerated | |
| 137 blits directly to it, then use page flipping. | |
| 138 */ | |
| 139 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 140 /* Direct hardware blitting without double-buffering | |
| 141 causes really bad flickering. | |
| 142 */ | |
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143 if ( info->video_mem*1024 > (height*width*bpp/8) ) { |
| 0 | 144 flags |= SDL_DOUBLEBUF; |
| 145 } else { | |
| 146 flags &= ~SDL_HWSURFACE; | |
| 147 } | |
| 148 } | |
| 149 | |
| 150 /* Return the flags */ | |
| 151 return(flags); | |
| 152 } | |
| 153 | |
| 154 int main(int argc, char *argv[]) | |
| 155 { | |
| 156 SDL_Surface *screen; | |
| 157 Uint8 *mem; | |
| 158 int width, height; | |
| 159 Uint8 video_bpp; | |
| 160 Uint32 videoflags; | |
| 161 Uint32 background; | |
| 162 int i, done; | |
| 163 SDL_Event event; | |
| 164 Uint32 then, now, frames; | |
| 165 | |
| 166 /* Initialize SDL */ | |
| 167 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 168 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
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169 return(1); |
| 0 | 170 } |
| 171 | |
| 172 numsprites = NUM_SPRITES; | |
| 173 videoflags = SDL_SWSURFACE|SDL_ANYFORMAT; | |
| 174 width = 640; | |
| 175 height = 480; | |
| 176 video_bpp = 8; | |
| 177 while ( argc > 1 ) { | |
| 178 --argc; | |
| 179 if ( strcmp(argv[argc-1], "-width") == 0 ) { | |
| 180 width = atoi(argv[argc]); | |
| 181 --argc; | |
| 182 } else | |
| 183 if ( strcmp(argv[argc-1], "-height") == 0 ) { | |
| 184 height = atoi(argv[argc]); | |
| 185 --argc; | |
| 186 } else | |
| 187 if ( strcmp(argv[argc-1], "-bpp") == 0 ) { | |
| 188 video_bpp = atoi(argv[argc]); | |
| 189 videoflags &= ~SDL_ANYFORMAT; | |
| 190 --argc; | |
| 191 } else | |
| 192 if ( strcmp(argv[argc], "-fast") == 0 ) { | |
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193 videoflags = FastestFlags(videoflags, width, height, video_bpp); |
| 0 | 194 } else |
| 195 if ( strcmp(argv[argc], "-hw") == 0 ) { | |
| 196 videoflags ^= SDL_HWSURFACE; | |
| 197 } else | |
| 198 if ( strcmp(argv[argc], "-flip") == 0 ) { | |
| 199 videoflags ^= SDL_DOUBLEBUF; | |
| 200 } else | |
| 201 if ( strcmp(argv[argc], "-fullscreen") == 0 ) { | |
| 202 videoflags ^= SDL_FULLSCREEN; | |
| 203 } else | |
| 204 if ( isdigit(argv[argc][0]) ) { | |
| 205 numsprites = atoi(argv[argc]); | |
| 206 } else { | |
| 207 fprintf(stderr, | |
| 208 "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n", | |
| 209 argv[0]); | |
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210 quit(1); |
| 0 | 211 } |
| 212 } | |
| 213 | |
| 214 /* Set video mode */ | |
| 215 screen = SDL_SetVideoMode(width, height, video_bpp, videoflags); | |
| 216 if ( ! screen ) { | |
| 217 fprintf(stderr, "Couldn't set %dx%d video mode: %s\n", | |
| 218 width, height, SDL_GetError()); | |
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219 quit(2); |
| 0 | 220 } |
| 221 | |
| 222 /* Load the sprite */ | |
| 223 if ( LoadSprite(screen, "icon.bmp") < 0 ) { | |
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224 quit(1); |
| 0 | 225 } |
| 226 | |
| 227 /* Allocate memory for the sprite info */ | |
| 228 mem = (Uint8 *)malloc(4*sizeof(SDL_Rect)*numsprites); | |
| 229 if ( mem == NULL ) { | |
| 230 SDL_FreeSurface(sprite); | |
| 231 fprintf(stderr, "Out of memory!\n"); | |
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232 quit(2); |
| 0 | 233 } |
| 234 sprite_rects = (SDL_Rect *)mem; | |
| 235 positions = sprite_rects; | |
| 236 sprite_rects += numsprites; | |
| 237 velocities = sprite_rects; | |
| 238 sprite_rects += numsprites; | |
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239 sprite_w = sprite->w; |
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240 sprite_h = sprite->h; |
| 0 | 241 srand(time(NULL)); |
| 242 for ( i=0; i<numsprites; ++i ) { | |
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243 positions[i].x = rand()%(screen->w - sprite_w); |
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244 positions[i].y = rand()%(screen->h - sprite_h); |
| 0 | 245 positions[i].w = sprite->w; |
| 246 positions[i].h = sprite->h; | |
| 247 velocities[i].x = 0; | |
| 248 velocities[i].y = 0; | |
| 249 while ( ! velocities[i].x && ! velocities[i].y ) { | |
| 250 velocities[i].x = (rand()%(MAX_SPEED*2+1))-MAX_SPEED; | |
| 251 velocities[i].y = (rand()%(MAX_SPEED*2+1))-MAX_SPEED; | |
| 252 } | |
| 253 } | |
| 254 background = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00); | |
| 255 | |
| 256 /* Print out information about our surfaces */ | |
| 257 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); | |
| 258 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 259 printf("Screen is in video memory\n"); | |
| 260 } else { | |
| 261 printf("Screen is in system memory\n"); | |
| 262 } | |
| 263 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { | |
| 264 printf("Screen has double-buffering enabled\n"); | |
| 265 } | |
| 266 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 267 printf("Sprite is in video memory\n"); | |
| 268 } else { | |
| 269 printf("Sprite is in system memory\n"); | |
| 270 } | |
| 271 /* Run a sample blit to trigger blit acceleration */ | |
| 272 { SDL_Rect dst; | |
| 273 dst.x = 0; | |
| 274 dst.y = 0; | |
| 275 dst.w = sprite->w; | |
| 276 dst.h = sprite->h; | |
| 277 SDL_BlitSurface(sprite, NULL, screen, &dst); | |
| 278 SDL_FillRect(screen, &dst, background); | |
| 279 } | |
| 280 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 281 printf("Sprite blit uses hardware acceleration\n"); | |
| 282 } | |
| 283 if ( (sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 284 printf("Sprite blit uses RLE acceleration\n"); | |
| 285 } | |
| 286 | |
| 287 /* Loop, blitting sprites and waiting for a keystroke */ | |
| 288 frames = 0; | |
| 289 then = SDL_GetTicks(); | |
| 290 done = 0; | |
| 291 sprites_visible = 0; | |
| 292 while ( !done ) { | |
| 293 /* Check for events */ | |
| 294 ++frames; | |
| 295 while ( SDL_PollEvent(&event) ) { | |
| 296 switch (event.type) { | |
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297 case SDL_MOUSEBUTTONDOWN: |
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298 SDL_WarpMouse(screen->w/2, screen->h/2); |
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299 break; |
| 0 | 300 case SDL_KEYDOWN: |
| 301 /* Any keypress quits the app... */ | |
| 302 case SDL_QUIT: | |
| 303 done = 1; | |
| 304 break; | |
| 305 default: | |
| 306 break; | |
| 307 } | |
| 308 } | |
| 309 MoveSprites(screen, background); | |
| 310 } | |
| 311 SDL_FreeSurface(sprite); | |
| 312 free(mem); | |
| 313 | |
| 314 /* Print out some timing information */ | |
| 315 now = SDL_GetTicks(); | |
| 316 if ( now > then ) { | |
| 317 printf("%2.2f frames per second\n", | |
| 318 ((double)frames*1000)/(now-then)); | |
| 319 } | |
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320 SDL_Quit(); |
| 0 | 321 return(0); |
| 322 } |