test/testsprite.c - third_party/sdl - Git at Google

 /* Simple program:  Move N sprites around on the screen as fast as possible */

 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>
 #include <time.h>
 #include <math.h>

 #include "SDL.h"

 #define NUM_SPRITES	100
 #define MAX_SPEED 	1

 SDL_Surface *sprite;
 int numsprites;
 SDL_Rect *sprite_rects;
 SDL_Rect *positions;
 SDL_Rect *velocities;
 int sprites_visible;
 int debug_flip;
 Uint16 sprite_w, sprite_h;

 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
 static void
 quit(int rc)
 {
     SDL_Quit();
     exit(rc);
 }

 int
 LoadSprite(char *file)
 {
     SDL_Surface *temp;

     /* Load the sprite image */
     sprite = SDL_LoadBMP(file);
     if (sprite == NULL) {
         fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
         return (-1);
     }

     /* Set transparent pixel as the pixel at (0,0) */
     if (sprite->format->palette) {
         SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY | SDL_RLEACCEL),
                         *(Uint8 *) sprite->pixels);
     }

     /* Convert sprite to video format */
     temp = SDL_DisplayFormat(sprite);
     SDL_FreeSurface(sprite);
     if (temp == NULL) {
         fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
         return (-1);
     }
     sprite = temp;

     /* We're ready to roll. :) */
     return (0);
 }

 void
 MoveSprites(SDL_Surface * screen, Uint32 background)
 {
     int i, nupdates;
     SDL_Rect area, *position, *velocity;

     nupdates = 0;
     /* Erase all the sprites if necessary */
     if (sprites_visible) {
         SDL_FillRect(screen, NULL, background);
     }

     /* Move the sprite, bounce at the wall, and draw */
     for (i = 0; i < numsprites; ++i) {
         position = &positions[i];
         velocity = &velocities[i];
         position->x += velocity->x;
         if ((position->x < 0) || (position->x >= (screen->w - sprite_w))) {
             velocity->x = -velocity->x;
             position->x += velocity->x;
         }
         position->y += velocity->y;
         if ((position->y < 0) || (position->y >= (screen->h - sprite_w))) {
             velocity->y = -velocity->y;
             position->y += velocity->y;
         }

         /* Blit the sprite onto the screen */
         area = *position;
         SDL_BlitSurface(sprite, NULL, screen, &area);
         sprite_rects[nupdates++] = area;
     }

     if (debug_flip) {
         if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
             static int t = 0;

             Uint32 color = SDL_MapRGB(screen->format, 255, 0, 0);
             SDL_Rect r;
             r.x =
                 (sin((float) t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w - 20);
             r.y = 0;
             r.w = 20;
             r.h = screen->h;

             SDL_FillRect(screen, &r, color);
             t += 2;
         }
     }

     /* Update the screen! */
     if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
         SDL_Flip(screen);
     } else {
         SDL_UpdateRects(screen, nupdates, sprite_rects);
     }
     sprites_visible = 1;
 }

 /* This is a way of telling whether or not to use hardware surfaces */
 Uint32
 FastestFlags(Uint32 flags, int width, int height, int bpp)
 {
     const SDL_VideoInfo *info;

     /* Hardware acceleration is only used in fullscreen mode */
     flags |= SDL_FULLSCREEN;

     /* Check for various video capabilities */
     info = SDL_GetVideoInfo();
     if (info->blit_hw_CC && info->blit_fill) {
         /* We use accelerated colorkeying and color filling */
         flags |= SDL_HWSURFACE;
     }
     /* If we have enough video memory, and will use accelerated
        blits directly to it, then use page flipping.
      */
     if ((flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
         /* Direct hardware blitting without double-buffering
            causes really bad flickering.
          */
         if (info->video_mem * 1024 > (height * width * bpp / 8)) {
             flags |= SDL_DOUBLEBUF;
         } else {
             flags &= ~SDL_HWSURFACE;
         }
     }

     /* Return the flags */
     return (flags);
 }

 int
 main(int argc, char *argv[])
 {
     SDL_Surface *screen;
     Uint8 *mem;
     int width, height;
     Uint8 video_bpp;
     Uint32 videoflags;
     Uint32 background;
     int i, done;
     SDL_Event event;
     Uint32 then, now, frames;

     /* Initialize SDL */
     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
         fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
         return (1);
     }

     numsprites = NUM_SPRITES;
     videoflags = SDL_SWSURFACE | SDL_ANYFORMAT;
     width = 640;
     height = 480;
     video_bpp = 8;
     debug_flip = 0;
     while (argc > 1) {
         --argc;
         if (strcmp(argv[argc - 1], "-width") == 0) {
             width = atoi(argv[argc]);
             --argc;
         } else if (strcmp(argv[argc - 1], "-height") == 0) {
             height = atoi(argv[argc]);
             --argc;
         } else if (strcmp(argv[argc - 1], "-bpp") == 0) {
             video_bpp = atoi(argv[argc]);
             videoflags &= ~SDL_ANYFORMAT;
             --argc;
         } else if (strcmp(argv[argc], "-fast") == 0) {
             videoflags = FastestFlags(videoflags, width, height, video_bpp);
         } else if (strcmp(argv[argc], "-hw") == 0) {
             videoflags ^= SDL_HWSURFACE;
         } else if (strcmp(argv[argc], "-flip") == 0) {
             videoflags ^= SDL_DOUBLEBUF;
         } else if (strcmp(argv[argc], "-debugflip") == 0) {
             debug_flip ^= 1;
         } else if (strcmp(argv[argc], "-fullscreen") == 0) {
             videoflags ^= SDL_FULLSCREEN;
         } else if (isdigit(argv[argc][0])) {
             numsprites = atoi(argv[argc]);
         } else {
             fprintf(stderr,
                     "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n",
                     argv[0]);
             quit(1);
         }
     }

     /* Set video mode */
     screen = SDL_SetVideoMode(width, height, video_bpp, videoflags);
     if (!screen) {
         fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
                 width, height, SDL_GetError());
         quit(2);
     }

     /* Load the sprite */
     if (LoadSprite("icon.bmp") < 0) {
         quit(1);
     }

     /* Allocate memory for the sprite info */
     mem = (Uint8 *) malloc(4 * sizeof(SDL_Rect) * numsprites);
     if (mem == NULL) {
         SDL_FreeSurface(sprite);
         fprintf(stderr, "Out of memory!\n");
         quit(2);
     }
     sprite_rects = (SDL_Rect *) mem;
     positions = sprite_rects;
     sprite_rects += numsprites;
     velocities = sprite_rects;
     sprite_rects += numsprites;
     sprite_w = sprite->w;
     sprite_h = sprite->h;
     srand(time(NULL));
     for (i = 0; i < numsprites; ++i) {
         positions[i].x = rand() % (screen->w - sprite_w);
         positions[i].y = rand() % (screen->h - sprite_h);
         positions[i].w = sprite->w;
         positions[i].h = sprite->h;
         velocities[i].x = 0;
         velocities[i].y = 0;
         while (!velocities[i].x && !velocities[i].y) {
             velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
             velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
         }
     }

     /* Clear the background to grey */
     background = SDL_MapRGB(screen->format, 0xA0, 0xA0, 0xA0);
     SDL_FillRect(screen, NULL, background);
     SDL_Flip(screen);

     /* 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 */
     {
         SDL_Rect dst;
         dst.x = 0;
         dst.y = 0;
         dst.w = sprite->w;
         dst.h = sprite->h;
         SDL_BlitSurface(sprite, NULL, screen, &dst);
         SDL_FillRect(screen, &dst, background);
     }
     if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
         printf("Sprite blit uses hardware acceleration\n");
     }
     if ((sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
         printf("Sprite blit uses RLE acceleration\n");
     }

     /* Loop, blitting sprites and waiting for a keystroke */
     frames = 0;
     then = SDL_GetTicks();
     done = 0;
     sprites_visible = 0;
     while (!done) {
         /* Check for events */
         ++frames;
         while (SDL_PollEvent(&event)) {
             switch (event.type) {
             case SDL_MOUSEBUTTONDOWN:
                 SDL_WarpMouse(screen->w / 2, screen->h / 2);
                 break;
             case SDL_KEYDOWN:
                 /* Any keypress quits the app... */
             case SDL_QUIT:
                 done = 1;
                 break;
             default:
                 break;
             }
         }
         MoveSprites(screen, background);
     }
     SDL_FreeSurface(sprite);
     free(mem);

     /* Print out some timing information */
     now = SDL_GetTicks();
     if (now > then) {
         double fps = ((double) frames * 1000) / (now - then);
         printf("%2.2f frames per second\n", fps);
     }
     SDL_Quit();
     return (0);
 }
	/* Simple program: Move N sprites around on the screen as fast as possible */

	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <ctype.h>
	#include <time.h>
	#include <math.h>

	#include "SDL.h"

	#define NUM_SPRITES 100
	#define MAX_SPEED 1

	SDL_Surface *sprite;
	int numsprites;
	SDL_Rect *sprite_rects;
	SDL_Rect *positions;
	SDL_Rect *velocities;
	int sprites_visible;
	int debug_flip;
	Uint16 sprite_w, sprite_h;

	/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
	static void
	quit(int rc)
	{
	SDL_Quit();
	exit(rc);
	}

	int
	LoadSprite(char *file)
	{
	SDL_Surface *temp;

	/* Load the sprite image */
	sprite = SDL_LoadBMP(file);
	if (sprite == NULL) {
	fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
	return (-1);
	}

	/* Set transparent pixel as the pixel at (0,0) */
	if (sprite->format->palette) {
	SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY \| SDL_RLEACCEL),
	(Uint8 ) sprite->pixels);
	}

	/* Convert sprite to video format */
	temp = SDL_DisplayFormat(sprite);
	SDL_FreeSurface(sprite);
	if (temp == NULL) {
	fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
	return (-1);
	}
	sprite = temp;

	/* We're ready to roll. :) */
	return (0);
	}

	void
	MoveSprites(SDL_Surface * screen, Uint32 background)
	{
	int i, nupdates;
	SDL_Rect area, position, velocity;

	nupdates = 0;
	/* Erase all the sprites if necessary */
	if (sprites_visible) {
	SDL_FillRect(screen, NULL, background);
	}

	/* Move the sprite, bounce at the wall, and draw */
	for (i = 0; i < numsprites; ++i) {
	position = &positions[i];
	velocity = &velocities[i];
	position->x += velocity->x;
	if ((position->x < 0) \|\| (position->x >= (screen->w - sprite_w))) {
	velocity->x = -velocity->x;
	position->x += velocity->x;
	}
	position->y += velocity->y;
	if ((position->y < 0) \|\| (position->y >= (screen->h - sprite_w))) {
	velocity->y = -velocity->y;
	position->y += velocity->y;
	}

	/* Blit the sprite onto the screen */
	area = *position;
	SDL_BlitSurface(sprite, NULL, screen, &area);
	sprite_rects[nupdates++] = area;
	}

	if (debug_flip) {
	if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
	static int t = 0;

	Uint32 color = SDL_MapRGB(screen->format, 255, 0, 0);
	SDL_Rect r;
	r.x =
	(sin((float) t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w - 20);
	r.y = 0;
	r.w = 20;
	r.h = screen->h;

	SDL_FillRect(screen, &r, color);
	t += 2;
	}
	}

	/* Update the screen! */
	if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
	SDL_Flip(screen);
	} else {
	SDL_UpdateRects(screen, nupdates, sprite_rects);
	}
	sprites_visible = 1;
	}

	/* This is a way of telling whether or not to use hardware surfaces */
	Uint32
	FastestFlags(Uint32 flags, int width, int height, int bpp)
	{
	const SDL_VideoInfo *info;

	/* Hardware acceleration is only used in fullscreen mode */
	flags \|= SDL_FULLSCREEN;

	/* Check for various video capabilities */
	info = SDL_GetVideoInfo();
	if (info->blit_hw_CC && info->blit_fill) {
	/* We use accelerated colorkeying and color filling */
	flags \|= SDL_HWSURFACE;
	}
	/* If we have enough video memory, and will use accelerated
	blits directly to it, then use page flipping.
	*/
	if ((flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
	/* Direct hardware blitting without double-buffering
	causes really bad flickering.
	*/
	if (info->video_mem * 1024 > (height * width * bpp / 8)) {
	flags \|= SDL_DOUBLEBUF;
	} else {
	flags &= ~SDL_HWSURFACE;
	}
	}

	/* Return the flags */
	return (flags);
	}

	int
	main(int argc, char *argv[])
	{
	SDL_Surface *screen;
	Uint8 *mem;
	int width, height;
	Uint8 video_bpp;
	Uint32 videoflags;
	Uint32 background;
	int i, done;
	SDL_Event event;
	Uint32 then, now, frames;

	/* Initialize SDL */
	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
	fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
	return (1);
	}

	numsprites = NUM_SPRITES;
	videoflags = SDL_SWSURFACE \| SDL_ANYFORMAT;
	width = 640;
	height = 480;
	video_bpp = 8;
	debug_flip = 0;
	while (argc > 1) {
	--argc;
	if (strcmp(argv[argc - 1], "-width") == 0) {
	width = atoi(argv[argc]);
	--argc;
	} else if (strcmp(argv[argc - 1], "-height") == 0) {
	height = atoi(argv[argc]);
	--argc;
	} else if (strcmp(argv[argc - 1], "-bpp") == 0) {
	video_bpp = atoi(argv[argc]);
	videoflags &= ~SDL_ANYFORMAT;
	--argc;
	} else if (strcmp(argv[argc], "-fast") == 0) {
	videoflags = FastestFlags(videoflags, width, height, video_bpp);
	} else if (strcmp(argv[argc], "-hw") == 0) {
	videoflags ^= SDL_HWSURFACE;
	} else if (strcmp(argv[argc], "-flip") == 0) {
	videoflags ^= SDL_DOUBLEBUF;
	} else if (strcmp(argv[argc], "-debugflip") == 0) {
	debug_flip ^= 1;
	} else if (strcmp(argv[argc], "-fullscreen") == 0) {
	videoflags ^= SDL_FULLSCREEN;
	} else if (isdigit(argv[argc][0])) {
	numsprites = atoi(argv[argc]);
	} else {
	fprintf(stderr,
	"Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n",
	argv[0]);
	quit(1);
	}
	}

	/* Set video mode */
	screen = SDL_SetVideoMode(width, height, video_bpp, videoflags);
	if (!screen) {
	fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
	width, height, SDL_GetError());
	quit(2);
	}

	/* Load the sprite */
	if (LoadSprite("icon.bmp") < 0) {
	quit(1);
	}

	/* Allocate memory for the sprite info */
	mem = (Uint8 ) malloc(4 sizeof(SDL_Rect) * numsprites);
	if (mem == NULL) {
	SDL_FreeSurface(sprite);
	fprintf(stderr, "Out of memory!\n");
	quit(2);
	}
	sprite_rects = (SDL_Rect *) mem;
	positions = sprite_rects;
	sprite_rects += numsprites;
	velocities = sprite_rects;
	sprite_rects += numsprites;
	sprite_w = sprite->w;
	sprite_h = sprite->h;
	srand(time(NULL));
	for (i = 0; i < numsprites; ++i) {
	positions[i].x = rand() % (screen->w - sprite_w);
	positions[i].y = rand() % (screen->h - sprite_h);
	positions[i].w = sprite->w;
	positions[i].h = sprite->h;
	velocities[i].x = 0;
	velocities[i].y = 0;
	while (!velocities[i].x && !velocities[i].y) {
	velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
	velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
	}
	}

	/* Clear the background to grey */
	background = SDL_MapRGB(screen->format, 0xA0, 0xA0, 0xA0);
	SDL_FillRect(screen, NULL, background);
	SDL_Flip(screen);

	/* 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 */
	{
	SDL_Rect dst;
	dst.x = 0;
	dst.y = 0;
	dst.w = sprite->w;
	dst.h = sprite->h;
	SDL_BlitSurface(sprite, NULL, screen, &dst);
	SDL_FillRect(screen, &dst, background);
	}
	if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
	printf("Sprite blit uses hardware acceleration\n");
	}
	if ((sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
	printf("Sprite blit uses RLE acceleration\n");
	}

	/* Loop, blitting sprites and waiting for a keystroke */
	frames = 0;
	then = SDL_GetTicks();
	done = 0;
	sprites_visible = 0;
	while (!done) {
	/* Check for events */
	++frames;
	while (SDL_PollEvent(&event)) {
	switch (event.type) {
	case SDL_MOUSEBUTTONDOWN:
	SDL_WarpMouse(screen->w / 2, screen->h / 2);
	break;
	case SDL_KEYDOWN:
	/* Any keypress quits the app... */
	case SDL_QUIT:
	done = 1;
	break;
	default:
	break;
	}
	}
	MoveSprites(screen, background);
	}
	SDL_FreeSurface(sprite);
	free(mem);

	/* Print out some timing information */
	now = SDL_GetTicks();
	if (now > then) {
	double fps = ((double) frames * 1000) / (now - then);
	printf("%2.2f frames per second\n", fps);
	}
	SDL_Quit();
	return (0);
	}