Mercurial > sdl-ios-xcode
diff test/testalpha.c @ 1895:c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Mon, 10 Jul 2006 21:04:37 +0000 |
parents | 67fc81efcfc3 |
children | c785543d1843 |
line wrap: on
line diff
--- a/test/testalpha.c Thu Jul 06 18:01:37 2006 +0000 +++ b/test/testalpha.c Mon Jul 10 21:04:37 2006 +0000 @@ -10,523 +10,527 @@ #include "SDL.h" -#define FRAME_TICKS (1000/30) /* 30 frames/second */ +#define FRAME_TICKS (1000/30) /* 30 frames/second */ /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ -static void quit(int rc) +static void +quit(int rc) { - SDL_Quit(); - exit(rc); + SDL_Quit(); + exit(rc); } /* Fill the screen with a gradient */ -static void FillBackground(SDL_Surface *screen) +static void +FillBackground(SDL_Surface * screen) { - Uint8 *buffer; - Uint16 *buffer16; - Uint16 color; - Uint8 gradient; - int i, k; + Uint8 *buffer; + Uint16 *buffer16; + Uint16 color; + Uint8 gradient; + int i, k; - /* Set the surface pixels and refresh! */ - if ( SDL_LockSurface(screen) < 0 ) { - fprintf(stderr, "Couldn't lock the display surface: %s\n", - SDL_GetError()); - quit(2); - } - buffer=(Uint8 *)screen->pixels; - if (screen->format->BytesPerPixel!=2) { - for ( i=0; i<screen->h; ++i ) { - memset(buffer,(i*255)/screen->h, screen->w*screen->format->BytesPerPixel); - buffer += screen->pitch; - } - } - else - { - for ( i=0; i<screen->h; ++i ) { - gradient=((i*255)/screen->h); - color = (Uint16)SDL_MapRGB(screen->format, gradient, gradient, gradient); - buffer16=(Uint16*)buffer; - for (k=0; k<screen->w; k++) - { - *(buffer16+k)=color; - } - buffer += screen->pitch; - } + /* Set the surface pixels and refresh! */ + if (SDL_LockSurface(screen) < 0) { + fprintf(stderr, "Couldn't lock the display surface: %s\n", + SDL_GetError()); + quit(2); + } + buffer = (Uint8 *) screen->pixels; + if (screen->format->BytesPerPixel != 2) { + for (i = 0; i < screen->h; ++i) { + memset(buffer, (i * 255) / screen->h, + screen->w * screen->format->BytesPerPixel); + buffer += screen->pitch; } + } else { + for (i = 0; i < screen->h; ++i) { + gradient = ((i * 255) / screen->h); + color = + (Uint16) SDL_MapRGB(screen->format, gradient, gradient, + gradient); + buffer16 = (Uint16 *) buffer; + for (k = 0; k < screen->w; k++) { + *(buffer16 + k) = color; + } + buffer += screen->pitch; + } + } - SDL_UnlockSurface(screen); - SDL_UpdateRect(screen, 0, 0, 0, 0); + SDL_UnlockSurface(screen); + SDL_UpdateRect(screen, 0, 0, 0, 0); } /* Create a "light" -- a yellowish surface with variable alpha */ -SDL_Surface *CreateLight(int radius) +SDL_Surface * +CreateLight(int radius) { - Uint8 trans, alphamask; - int range, addition; - int xdist, ydist; - Uint16 x, y; - Uint16 skip; - Uint32 pixel; - SDL_Surface *light; + Uint8 trans, alphamask; + int range, addition; + int xdist, ydist; + Uint16 x, y; + Uint16 skip; + Uint32 pixel; + SDL_Surface *light; #ifdef LIGHT_16BIT - Uint16 *buf; + Uint16 *buf; - /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */ - /* Note: this isn't any faster than a 32 bit alpha surface */ - alphamask = 0x0000000F; - light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16, - 0x0000F000, 0x00000F00, 0x000000F0, alphamask); + /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */ + /* Note: this isn't any faster than a 32 bit alpha surface */ + alphamask = 0x0000000F; + light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 16, + 0x0000F000, 0x00000F00, 0x000000F0, + alphamask); #else - Uint32 *buf; + Uint32 *buf; - /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */ - alphamask = 0x000000FF; - light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32, - 0xFF000000, 0x00FF0000, 0x0000FF00, alphamask); - if ( light == NULL ) { - fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError()); - return(NULL); - } + /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */ + alphamask = 0x000000FF; + light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 32, + 0xFF000000, 0x00FF0000, 0x0000FF00, + alphamask); + if (light == NULL) { + fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError()); + return (NULL); + } #endif - /* Fill with a light yellow-orange color */ - skip = light->pitch-(light->w*light->format->BytesPerPixel); + /* Fill with a light yellow-orange color */ + skip = light->pitch - (light->w * light->format->BytesPerPixel); #ifdef LIGHT_16BIT - buf = (Uint16 *)light->pixels; + buf = (Uint16 *) light->pixels; #else - buf = (Uint32 *)light->pixels; + buf = (Uint32 *) light->pixels; #endif - /* Get a tranparent pixel value - we'll add alpha later */ - pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0); - for ( y=0; y<light->h; ++y ) { - for ( x=0; x<light->w; ++x ) { - *buf++ = pixel; - } - buf += skip; /* Almost always 0, but just in case... */ - } + /* Get a tranparent pixel value - we'll add alpha later */ + pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0); + for (y = 0; y < light->h; ++y) { + for (x = 0; x < light->w; ++x) { + *buf++ = pixel; + } + buf += skip; /* Almost always 0, but just in case... */ + } - /* Calculate alpha values for the surface. */ + /* Calculate alpha values for the surface. */ #ifdef LIGHT_16BIT - buf = (Uint16 *)light->pixels; + buf = (Uint16 *) light->pixels; #else - buf = (Uint32 *)light->pixels; + buf = (Uint32 *) light->pixels; #endif - for ( y=0; y<light->h; ++y ) { - for ( x=0; x<light->w; ++x ) { - /* Slow distance formula (from center of light) */ - xdist = x-(light->w/2); - ydist = y-(light->h/2); - range = (int)sqrt(xdist*xdist+ydist*ydist); + for (y = 0; y < light->h; ++y) { + for (x = 0; x < light->w; ++x) { + /* Slow distance formula (from center of light) */ + xdist = x - (light->w / 2); + ydist = y - (light->h / 2); + range = (int) sqrt(xdist * xdist + ydist * ydist); - /* Scale distance to range of transparency (0-255) */ - if ( range > radius ) { - trans = alphamask; - } else { - /* Increasing transparency with distance */ - trans = (Uint8)((range*alphamask)/radius); + /* Scale distance to range of transparency (0-255) */ + if (range > radius) { + trans = alphamask; + } else { + /* Increasing transparency with distance */ + trans = (Uint8) ((range * alphamask) / radius); - /* Lights are very transparent */ - addition = (alphamask+1)/8; - if ( (int)trans+addition > alphamask ) { - trans = alphamask; - } else { - trans += addition; - } - } - /* We set the alpha component as the right N bits */ - *buf++ |= (255-trans); - } - buf += skip; /* Almost always 0, but just in case... */ - } - /* Enable RLE acceleration of this alpha surface */ - SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0); + /* Lights are very transparent */ + addition = (alphamask + 1) / 8; + if ((int) trans + addition > alphamask) { + trans = alphamask; + } else { + trans += addition; + } + } + /* We set the alpha component as the right N bits */ + *buf++ |= (255 - trans); + } + buf += skip; /* Almost always 0, but just in case... */ + } + /* Enable RLE acceleration of this alpha surface */ + SDL_SetAlpha(light, SDL_SRCALPHA | SDL_RLEACCEL, 0); - /* We're done! */ - return(light); + /* We're done! */ + return (light); } static Uint32 flashes = 0; static Uint32 flashtime = 0; -void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y) +void +FlashLight(SDL_Surface * screen, SDL_Surface * light, int x, int y) { - SDL_Rect position; - Uint32 ticks1; - Uint32 ticks2; + SDL_Rect position; + Uint32 ticks1; + Uint32 ticks2; - /* Easy, center light */ - position.x = x-(light->w/2); - position.y = y-(light->h/2); - position.w = light->w; - position.h = light->h; - ticks1 = SDL_GetTicks(); - SDL_BlitSurface(light, NULL, screen, &position); - ticks2 = SDL_GetTicks(); - SDL_UpdateRects(screen, 1, &position); - ++flashes; + /* Easy, center light */ + position.x = x - (light->w / 2); + position.y = y - (light->h / 2); + position.w = light->w; + position.h = light->h; + ticks1 = SDL_GetTicks(); + SDL_BlitSurface(light, NULL, screen, &position); + ticks2 = SDL_GetTicks(); + SDL_UpdateRects(screen, 1, &position); + ++flashes; - /* Update time spend doing alpha blitting */ - flashtime += (ticks2-ticks1); + /* Update time spend doing alpha blitting */ + flashtime += (ticks2 - ticks1); } static int sprite_visible = 0; static SDL_Surface *sprite; static SDL_Surface *backing; -static SDL_Rect position; -static int x_vel, y_vel; -static int alpha_vel; +static SDL_Rect position; +static int x_vel, y_vel; +static int alpha_vel; -int LoadSprite(SDL_Surface *screen, char *file) +int +LoadSprite(SDL_Surface * screen, char *file) { - SDL_Surface *converted; - - /* Load the sprite image */ - sprite = SDL_LoadBMP(file); - if ( sprite == NULL ) { - fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); - return(-1); - } + SDL_Surface *converted; - /* Set transparent pixel as the pixel at (0,0) */ - if ( sprite->format->palette ) { - SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, - *(Uint8 *)sprite->pixels); - } + /* Load the sprite image */ + sprite = SDL_LoadBMP(file); + if (sprite == NULL) { + fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError()); + return (-1); + } - /* Convert sprite to video format */ - converted = SDL_DisplayFormat(sprite); - SDL_FreeSurface(sprite); - if ( converted == NULL ) { - fprintf(stderr, "Couldn't convert background: %s\n", - SDL_GetError()); - return(-1); - } - sprite = converted; + /* Set transparent pixel as the pixel at (0,0) */ + if (sprite->format->palette) { + SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, *(Uint8 *) sprite->pixels); + } + + /* Convert sprite to video format */ + converted = SDL_DisplayFormat(sprite); + SDL_FreeSurface(sprite); + if (converted == NULL) { + fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError()); + return (-1); + } + sprite = converted; - /* Create the background */ - backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8, - 0, 0, 0, 0); - if ( backing == NULL ) { - fprintf(stderr, "Couldn't create background: %s\n", - SDL_GetError()); - SDL_FreeSurface(sprite); - return(-1); - } + /* Create the background */ + backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8, + 0, 0, 0, 0); + if (backing == NULL) { + fprintf(stderr, "Couldn't create background: %s\n", SDL_GetError()); + SDL_FreeSurface(sprite); + return (-1); + } - /* Convert background to video format */ - converted = SDL_DisplayFormat(backing); - SDL_FreeSurface(backing); - if ( converted == NULL ) { - fprintf(stderr, "Couldn't convert background: %s\n", - SDL_GetError()); - SDL_FreeSurface(sprite); - return(-1); - } - backing = converted; + /* Convert background to video format */ + converted = SDL_DisplayFormat(backing); + SDL_FreeSurface(backing); + if (converted == NULL) { + fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError()); + SDL_FreeSurface(sprite); + return (-1); + } + backing = converted; - /* Set the initial position of the sprite */ - position.x = (screen->w-sprite->w)/2; - position.y = (screen->h-sprite->h)/2; - position.w = sprite->w; - position.h = sprite->h; - x_vel = 0; y_vel = 0; - alpha_vel = 1; + /* Set the initial position of the sprite */ + position.x = (screen->w - sprite->w) / 2; + position.y = (screen->h - sprite->h) / 2; + position.w = sprite->w; + position.h = sprite->h; + x_vel = 0; + y_vel = 0; + alpha_vel = 1; - /* We're ready to roll. :) */ - return(0); + /* We're ready to roll. :) */ + return (0); } -void AttractSprite(Uint16 x, Uint16 y) +void +AttractSprite(Uint16 x, Uint16 y) { - x_vel = ((int)x-position.x)/10; - y_vel = ((int)y-position.y)/10; + x_vel = ((int) x - position.x) / 10; + y_vel = ((int) y - position.y) / 10; } -void MoveSprite(SDL_Surface *screen, SDL_Surface *light) +void +MoveSprite(SDL_Surface * screen, SDL_Surface * light) { - SDL_Rect updates[2]; - int alpha; + SDL_Rect updates[2]; + int alpha; - /* Erase the sprite if it was visible */ - if ( sprite_visible ) { - updates[0] = position; - SDL_BlitSurface(backing, NULL, screen, &updates[0]); - } else { - updates[0].x = 0; updates[0].y = 0; - updates[0].w = 0; updates[0].h = 0; - sprite_visible = 1; - } + /* Erase the sprite if it was visible */ + if (sprite_visible) { + updates[0] = position; + SDL_BlitSurface(backing, NULL, screen, &updates[0]); + } else { + updates[0].x = 0; + updates[0].y = 0; + updates[0].w = 0; + updates[0].h = 0; + sprite_visible = 1; + } - /* Since the sprite is off the screen, we can do other drawing - without being overwritten by the saved area behind the sprite. - */ - if ( light != NULL ) { - int x, y; + /* Since the sprite is off the screen, we can do other drawing + without being overwritten by the saved area behind the sprite. + */ + if (light != NULL) { + int x, y; + + SDL_GetMouseState(&x, &y); + FlashLight(screen, light, x, y); + } - SDL_GetMouseState(&x, &y); - FlashLight(screen, light, x, y); - } - - /* Move the sprite, bounce at the wall */ - position.x += x_vel; - if ( (position.x < 0) || (position.x >= screen->w) ) { - x_vel = -x_vel; - position.x += x_vel; - } - position.y += y_vel; - if ( (position.y < 0) || (position.y >= screen->h) ) { - y_vel = -y_vel; - position.y += y_vel; - } + /* Move the sprite, bounce at the wall */ + position.x += x_vel; + if ((position.x < 0) || (position.x >= screen->w)) { + x_vel = -x_vel; + position.x += x_vel; + } + position.y += y_vel; + if ((position.y < 0) || (position.y >= screen->h)) { + y_vel = -y_vel; + position.y += y_vel; + } - /* Update transparency (fade in and out) */ - alpha = sprite->format->alpha; - if ( (alpha+alpha_vel) < 0 ) { - alpha_vel = -alpha_vel; - } else - if ( (alpha+alpha_vel) > 255 ) { - alpha_vel = -alpha_vel; - } - SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel)); + /* Update transparency (fade in and out) */ + alpha = sprite->format->alpha; + if ((alpha + alpha_vel) < 0) { + alpha_vel = -alpha_vel; + } else if ((alpha + alpha_vel) > 255) { + alpha_vel = -alpha_vel; + } + SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8) (alpha + alpha_vel)); - /* Save the area behind the sprite */ - updates[1] = position; - SDL_BlitSurface(screen, &updates[1], backing, NULL); - - /* Blit the sprite onto the screen */ - updates[1] = position; - SDL_BlitSurface(sprite, NULL, screen, &updates[1]); + /* Save the area behind the sprite */ + updates[1] = position; + SDL_BlitSurface(screen, &updates[1], backing, NULL); - /* Make it so! */ - SDL_UpdateRects(screen, 2, updates); + /* Blit the sprite onto the screen */ + updates[1] = position; + SDL_BlitSurface(sprite, NULL, screen, &updates[1]); + + /* Make it so! */ + SDL_UpdateRects(screen, 2, updates); } -void WarpSprite(SDL_Surface *screen, int x, int y) +void +WarpSprite(SDL_Surface * screen, int x, int y) { - SDL_Rect updates[2]; + SDL_Rect updates[2]; - /* Erase, move, Draw, update */ - updates[0] = position; - SDL_BlitSurface(backing, NULL, screen, &updates[0]); - position.x = x-sprite->w/2; /* Center about X */ - position.y = y-sprite->h/2; /* Center about Y */ - updates[1] = position; - SDL_BlitSurface(screen, &updates[1], backing, NULL); - updates[1] = position; - SDL_BlitSurface(sprite, NULL, screen, &updates[1]); - SDL_UpdateRects(screen, 2, updates); + /* Erase, move, Draw, update */ + updates[0] = position; + SDL_BlitSurface(backing, NULL, screen, &updates[0]); + position.x = x - sprite->w / 2; /* Center about X */ + position.y = y - sprite->h / 2; /* Center about Y */ + updates[1] = position; + SDL_BlitSurface(screen, &updates[1], backing, NULL); + updates[1] = position; + SDL_BlitSurface(sprite, NULL, screen, &updates[1]); + SDL_UpdateRects(screen, 2, updates); } -int main(int argc, char *argv[]) +int +main(int argc, char *argv[]) { - const SDL_VideoInfo *info; - SDL_Surface *screen; - int w, h; - Uint8 video_bpp; - Uint32 videoflags; - int i, done; - SDL_Event event; - SDL_Surface *light; - int mouse_pressed; - Uint32 ticks, lastticks; + const SDL_VideoInfo *info; + SDL_Surface *screen; + int w, h; + Uint8 video_bpp; + Uint32 videoflags; + int i, done; + SDL_Event event; + SDL_Surface *light; + int mouse_pressed; + Uint32 ticks, lastticks; - /* Initialize SDL */ - if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { - fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); - return(1); - } + /* Initialize SDL */ + if (SDL_Init(SDL_INIT_VIDEO) < 0) { + fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError()); + return (1); + } - /* Alpha blending doesn't work well at 8-bit color */ + /* Alpha blending doesn't work well at 8-bit color */ #ifdef _WIN32_WCE - /* Pocket PC */ - w = 240; - h = 320; + /* Pocket PC */ + w = 240; + h = 320; #else - w = 640; - h = 480; + w = 640; + h = 480; #endif - info = SDL_GetVideoInfo(); - if ( info->vfmt->BitsPerPixel > 8 ) { - video_bpp = info->vfmt->BitsPerPixel; - } else { - video_bpp = 16; + info = SDL_GetVideoInfo(); + if (info->vfmt->BitsPerPixel > 8) { + video_bpp = info->vfmt->BitsPerPixel; + } else { + video_bpp = 16; + fprintf(stderr, "forced 16 bpp mode\n"); + } + videoflags = SDL_SWSURFACE; + for (i = 1; argv[i]; ++i) { + if (strcmp(argv[i], "-bpp") == 0) { + video_bpp = atoi(argv[++i]); + if (video_bpp <= 8) { + video_bpp = 16; fprintf(stderr, "forced 16 bpp mode\n"); - } - videoflags = SDL_SWSURFACE; - for ( i = 1; argv[i]; ++i ) { - if ( strcmp(argv[i], "-bpp") == 0 ) { - video_bpp = atoi(argv[++i]); - if (video_bpp<=8) { - video_bpp=16; - fprintf(stderr, "forced 16 bpp mode\n"); - } - } else - if ( strcmp(argv[i], "-hw") == 0 ) { - videoflags |= SDL_HWSURFACE; - } else - if ( strcmp(argv[i], "-warp") == 0 ) { - videoflags |= SDL_HWPALETTE; - } else - if ( strcmp(argv[i], "-width") == 0 && argv[i+1] ) { - w = atoi(argv[++i]); - } else - if ( strcmp(argv[i], "-height") == 0 && argv[i+1] ) { - h = atoi(argv[++i]); - } else - if ( strcmp(argv[i], "-resize") == 0 ) { - videoflags |= SDL_RESIZABLE; - } else - if ( strcmp(argv[i], "-noframe") == 0 ) { - videoflags |= SDL_NOFRAME; - } else - if ( strcmp(argv[i], "-fullscreen") == 0 ) { - videoflags |= SDL_FULLSCREEN; - } else { - fprintf(stderr, - "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n", - argv[0]); - quit(1); - } - } + } + } else if (strcmp(argv[i], "-hw") == 0) { + videoflags |= SDL_HWSURFACE; + } else if (strcmp(argv[i], "-warp") == 0) { + videoflags |= SDL_HWPALETTE; + } else if (strcmp(argv[i], "-width") == 0 && argv[i + 1]) { + w = atoi(argv[++i]); + } else if (strcmp(argv[i], "-height") == 0 && argv[i + 1]) { + h = atoi(argv[++i]); + } else if (strcmp(argv[i], "-resize") == 0) { + videoflags |= SDL_RESIZABLE; + } else if (strcmp(argv[i], "-noframe") == 0) { + videoflags |= SDL_NOFRAME; + } else if (strcmp(argv[i], "-fullscreen") == 0) { + videoflags |= SDL_FULLSCREEN; + } else { + fprintf(stderr, + "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n", + argv[0]); + quit(1); + } + } + + /* Set video mode */ + if ((screen = SDL_SetVideoMode(w, h, video_bpp, videoflags)) == NULL) { + fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n", + w, h, video_bpp, SDL_GetError()); + quit(2); + } + FillBackground(screen); - /* Set video mode */ - if ( (screen=SDL_SetVideoMode(w,h,video_bpp,videoflags)) == NULL ) { - fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n", - w, h, video_bpp, SDL_GetError()); - quit(2); - } - FillBackground(screen); + /* Create the light */ + light = CreateLight(82); + if (light == NULL) { + quit(1); + } - /* Create the light */ - light = CreateLight(82); - if ( light == NULL ) { - quit(1); - } + /* Load the sprite */ + if (LoadSprite(screen, "icon.bmp") < 0) { + SDL_FreeSurface(light); + quit(1); + } - /* Load the sprite */ - if ( LoadSprite(screen, "icon.bmp") < 0 ) { - SDL_FreeSurface(light); - quit(1); - } + /* Print out information about our surfaces */ + printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel); + if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { + printf("Screen is in video memory\n"); + } else { + printf("Screen is in system memory\n"); + } + if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) { + printf("Screen has double-buffering enabled\n"); + } + if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { + printf("Sprite is in video memory\n"); + } else { + printf("Sprite is in system memory\n"); + } - /* Print out information about our surfaces */ - printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel); - if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { - printf("Screen is in video memory\n"); - } else { - printf("Screen is in system memory\n"); - } - if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { - printf("Screen has double-buffering enabled\n"); - } - if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { - printf("Sprite is in video memory\n"); - } else { - printf("Sprite is in system memory\n"); - } + /* Run a sample blit to trigger blit acceleration */ + MoveSprite(screen, NULL); + if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) { + printf("Sprite blit uses hardware alpha acceleration\n"); + } else { + printf("Sprite blit dosn't uses hardware alpha acceleration\n"); + } - /* Run a sample blit to trigger blit acceleration */ - MoveSprite(screen, NULL); - if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) { - printf("Sprite blit uses hardware alpha acceleration\n"); - } else { - printf("Sprite blit dosn't uses hardware alpha acceleration\n"); - } - - /* Set a clipping rectangle to clip the outside edge of the screen */ - { SDL_Rect clip; - clip.x = 32; - clip.y = 32; - clip.w = screen->w-(2*32); - clip.h = screen->h-(2*32); - SDL_SetClipRect(screen, &clip); - } + /* Set a clipping rectangle to clip the outside edge of the screen */ + { + SDL_Rect clip; + clip.x = 32; + clip.y = 32; + clip.w = screen->w - (2 * 32); + clip.h = screen->h - (2 * 32); + SDL_SetClipRect(screen, &clip); + } - /* Wait for a keystroke */ - lastticks = SDL_GetTicks(); - done = 0; - mouse_pressed = 0; - while ( !done ) { - /* Update the frame -- move the sprite */ - if ( mouse_pressed ) { - MoveSprite(screen, light); - mouse_pressed = 0; - } else { - MoveSprite(screen, NULL); - } + /* Wait for a keystroke */ + lastticks = SDL_GetTicks(); + done = 0; + mouse_pressed = 0; + while (!done) { + /* Update the frame -- move the sprite */ + if (mouse_pressed) { + MoveSprite(screen, light); + mouse_pressed = 0; + } else { + MoveSprite(screen, NULL); + } - /* Slow down the loop to 30 frames/second */ - ticks = SDL_GetTicks(); - if ( (ticks-lastticks) < FRAME_TICKS ) { + /* Slow down the loop to 30 frames/second */ + ticks = SDL_GetTicks(); + if ((ticks - lastticks) < FRAME_TICKS) { #ifdef CHECK_SLEEP_GRANULARITY -fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks)); + fprintf(stderr, "Sleeping %d ticks\n", + FRAME_TICKS - (ticks - lastticks)); #endif - SDL_Delay(FRAME_TICKS-(ticks-lastticks)); + SDL_Delay(FRAME_TICKS - (ticks - lastticks)); #ifdef CHECK_SLEEP_GRANULARITY -fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks)); + fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks() - ticks)); #endif - } - lastticks = ticks; + } + lastticks = ticks; - /* Check for events */ - while ( SDL_PollEvent(&event) ) { - switch (event.type) { - case SDL_VIDEORESIZE: - screen = SDL_SetVideoMode(event.resize.w, event.resize.h, video_bpp, videoflags); - if ( screen ) { - FillBackground(screen); - } - break; - /* Attract sprite while mouse is held down */ - case SDL_MOUSEMOTION: - if (event.motion.state != 0) { - AttractSprite(event.motion.x, - event.motion.y); - mouse_pressed = 1; - } - break; - case SDL_MOUSEBUTTONDOWN: - if ( event.button.button == 1 ) { - AttractSprite(event.button.x, - event.button.y); - mouse_pressed = 1; - } else { - SDL_Rect area; + /* Check for events */ + while (SDL_PollEvent(&event)) { + switch (event.type) { + case SDL_VIDEORESIZE: + screen = + SDL_SetVideoMode(event.resize.w, event.resize.h, + video_bpp, videoflags); + if (screen) { + FillBackground(screen); + } + break; + /* Attract sprite while mouse is held down */ + case SDL_MOUSEMOTION: + if (event.motion.state != 0) { + AttractSprite(event.motion.x, event.motion.y); + mouse_pressed = 1; + } + break; + case SDL_MOUSEBUTTONDOWN: + if (event.button.button == 1) { + AttractSprite(event.button.x, event.button.y); + mouse_pressed = 1; + } else { + SDL_Rect area; - area.x = event.button.x-16; - area.y = event.button.y-16; - area.w = 32; - area.h = 32; - SDL_FillRect(screen, &area, 0); - SDL_UpdateRects(screen,1,&area); - } - break; - case SDL_KEYDOWN: - if ( event.key.keysym.sym == SDLK_ESCAPE ) { - done = 1; - } - break; - case SDL_QUIT: - done = 1; - break; - default: - break; - } - } - } - SDL_FreeSurface(light); - SDL_FreeSurface(sprite); - SDL_FreeSurface(backing); + area.x = event.button.x - 16; + area.y = event.button.y - 16; + area.w = 32; + area.h = 32; + SDL_FillRect(screen, &area, 0); + SDL_UpdateRects(screen, 1, &area); + } + break; + case SDL_KEYDOWN: + if (event.key.keysym.sym == SDLK_ESCAPE) { + done = 1; + } + break; + case SDL_QUIT: + done = 1; + break; + default: + break; + } + } + } + SDL_FreeSurface(light); + SDL_FreeSurface(sprite); + SDL_FreeSurface(backing); - /* Print out some timing information */ - if ( flashes > 0 ) { - printf("%d alpha blits, ~%4.4f ms per blit\n", - flashes, (float)flashtime/flashes); - } + /* Print out some timing information */ + if (flashes > 0) { + printf("%d alpha blits, ~%4.4f ms per blit\n", + flashes, (float) flashtime / flashes); + } - SDL_Quit(); - return(0); + SDL_Quit(); + return (0); }