slouken@0
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1 |
/* Simple program: Move N sprites around on the screen as fast as possible */
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slouken@0
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2 |
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slouken@0
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3 |
#include <stdio.h>
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slouken@0
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4 |
#include <stdlib.h>
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slouken@0
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5 |
#include <string.h>
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slouken@0
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6 |
#include <ctype.h>
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slouken@753
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7 |
#include <math.h>
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slouken@0
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8 |
#include <time.h>
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slouken@0
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9 |
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slouken@0
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10 |
#include "SDL.h"
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slouken@0
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11 |
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slouken@0
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12 |
#define NUM_SPRITES 100
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slouken@0
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13 |
#define MAX_SPEED 1
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slouken@0
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14 |
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slouken@0
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15 |
SDL_Surface *sprite;
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slouken@0
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16 |
int numsprites;
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slouken@0
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17 |
SDL_Rect *sprite_rects;
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slouken@0
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18 |
SDL_Rect *positions;
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slouken@0
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19 |
SDL_Rect *velocities;
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slouken@0
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20 |
int sprites_visible;
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icculus@1214
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21 |
int debug_flip;
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slouken@288
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22 |
Uint16 sprite_w, sprite_h;
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slouken@0
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23 |
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icculus@1151
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24 |
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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icculus@1151
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25 |
static void quit(int rc)
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icculus@1151
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26 |
{
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icculus@1151
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27 |
SDL_Quit();
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icculus@1151
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28 |
exit(rc);
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icculus@1151
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29 |
}
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icculus@1151
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30 |
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slouken@0
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31 |
int LoadSprite(SDL_Surface *screen, char *file)
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slouken@0
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32 |
{
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slouken@0
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33 |
SDL_Surface *temp;
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slouken@0
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34 |
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slouken@0
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35 |
/* Load the sprite image */
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slouken@0
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36 |
sprite = SDL_LoadBMP(file);
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slouken@0
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37 |
if ( sprite == NULL ) {
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slouken@0
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38 |
fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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slouken@0
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return(-1);
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slouken@0
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}
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slouken@0
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slouken@0
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42 |
/* Set transparent pixel as the pixel at (0,0) */
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slouken@0
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43 |
if ( sprite->format->palette ) {
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slouken@0
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44 |
SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY|SDL_RLEACCEL),
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slouken@0
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45 |
*(Uint8 *)sprite->pixels);
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slouken@0
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46 |
}
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slouken@0
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slouken@0
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/* Convert sprite to video format */
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slouken@0
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temp = SDL_DisplayFormat(sprite);
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slouken@0
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50 |
SDL_FreeSurface(sprite);
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slouken@0
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if ( temp == NULL ) {
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slouken@0
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fprintf(stderr, "Couldn't convert background: %s\n",
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slouken@0
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SDL_GetError());
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slouken@0
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return(-1);
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slouken@0
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55 |
}
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slouken@0
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sprite = temp;
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slouken@0
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slouken@0
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/* We're ready to roll. :) */
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slouken@0
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return(0);
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slouken@0
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}
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slouken@0
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slouken@0
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void MoveSprites(SDL_Surface *screen, Uint32 background)
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slouken@0
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{
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slouken@0
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int i, nupdates;
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slouken@0
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SDL_Rect area, *position, *velocity;
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slouken@0
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slouken@0
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nupdates = 0;
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slouken@0
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/* Erase all the sprites if necessary */
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slouken@0
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if ( sprites_visible ) {
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slouken@0
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SDL_FillRect(screen, NULL, background);
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slouken@0
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}
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slouken@0
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slouken@0
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/* Move the sprite, bounce at the wall, and draw */
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slouken@0
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for ( i=0; i<numsprites; ++i ) {
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slouken@0
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position = &positions[i];
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slouken@0
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velocity = &velocities[i];
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slouken@0
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position->x += velocity->x;
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slouken@288
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if ( (position->x < 0) || (position->x >= (screen->w - sprite_w)) ) {
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slouken@0
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velocity->x = -velocity->x;
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slouken@0
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position->x += velocity->x;
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slouken@0
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}
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slouken@0
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position->y += velocity->y;
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slouken@288
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if ( (position->y < 0) || (position->y >= (screen->h - sprite_w)) ) {
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slouken@0
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velocity->y = -velocity->y;
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slouken@0
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position->y += velocity->y;
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slouken@0
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}
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slouken@0
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slouken@0
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/* Blit the sprite onto the screen */
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slouken@0
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area = *position;
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slouken@0
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SDL_BlitSurface(sprite, NULL, screen, &area);
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slouken@0
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sprite_rects[nupdates++] = area;
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slouken@0
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}
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slouken@0
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icculus@1214
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if (debug_flip) {
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icculus@1214
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if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
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icculus@1214
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static int t = 0;
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slouken@663
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icculus@1214
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Uint32 color = SDL_MapRGB (screen->format, 255, 0, 0);
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icculus@1214
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SDL_Rect r;
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icculus@1214
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r.x = (sin((float)t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w-20);
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icculus@1214
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r.y = 0;
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icculus@1214
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r.w = 20;
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icculus@1214
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r.h = screen->h;
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icculus@1214
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icculus@1214
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SDL_FillRect (screen, &r, color);
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icculus@1214
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t+=2;
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icculus@1214
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}
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icculus@1214
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}
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icculus@1214
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slouken@0
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/* Update the screen! */
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slouken@0
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if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
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slouken@0
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SDL_Flip(screen);
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slouken@0
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} else {
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slouken@0
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SDL_UpdateRects(screen, nupdates, sprite_rects);
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slouken@0
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}
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slouken@0
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sprites_visible = 1;
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slouken@0
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}
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slouken@0
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slouken@0
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/* This is a way of telling whether or not to use hardware surfaces */
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slouken@107
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Uint32 FastestFlags(Uint32 flags, int width, int height, int bpp)
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slouken@0
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{
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slouken@0
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const SDL_VideoInfo *info;
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slouken@0
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slouken@0
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/* Hardware acceleration is only used in fullscreen mode */
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slouken@0
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flags |= SDL_FULLSCREEN;
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slouken@0
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slouken@0
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127 |
/* Check for various video capabilities */
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slouken@0
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128 |
info = SDL_GetVideoInfo();
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slouken@0
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if ( info->blit_hw_CC && info->blit_fill ) {
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slouken@0
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130 |
/* We use accelerated colorkeying and color filling */
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slouken@0
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flags |= SDL_HWSURFACE;
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slouken@0
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132 |
}
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slouken@0
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/* If we have enough video memory, and will use accelerated
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slouken@0
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blits directly to it, then use page flipping.
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slouken@0
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*/
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slouken@0
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if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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slouken@0
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/* Direct hardware blitting without double-buffering
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slouken@0
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causes really bad flickering.
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slouken@0
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*/
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slouken@107
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if ( info->video_mem*1024 > (height*width*bpp/8) ) {
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slouken@0
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141 |
flags |= SDL_DOUBLEBUF;
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slouken@0
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142 |
} else {
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slouken@0
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143 |
flags &= ~SDL_HWSURFACE;
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slouken@0
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144 |
}
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slouken@0
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145 |
}
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slouken@0
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146 |
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slouken@0
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147 |
/* Return the flags */
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slouken@0
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148 |
return(flags);
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slouken@0
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149 |
}
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slouken@0
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150 |
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slouken@0
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151 |
int main(int argc, char *argv[])
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slouken@0
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152 |
{
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slouken@0
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153 |
SDL_Surface *screen;
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slouken@0
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154 |
Uint8 *mem;
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slouken@0
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155 |
int width, height;
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slouken@0
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156 |
Uint8 video_bpp;
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slouken@0
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157 |
Uint32 videoflags;
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slouken@0
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158 |
Uint32 background;
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slouken@0
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159 |
int i, done;
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slouken@0
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160 |
SDL_Event event;
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slouken@0
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161 |
Uint32 then, now, frames;
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slouken@0
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162 |
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slouken@0
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163 |
/* Initialize SDL */
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slouken@0
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164 |
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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slouken@0
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165 |
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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icculus@1151
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166 |
return(1);
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slouken@0
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167 |
}
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slouken@0
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168 |
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slouken@0
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169 |
numsprites = NUM_SPRITES;
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slouken@0
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170 |
videoflags = SDL_SWSURFACE|SDL_ANYFORMAT;
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slouken@0
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171 |
width = 640;
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slouken@0
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height = 480;
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slouken@0
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173 |
video_bpp = 8;
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icculus@1214
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174 |
debug_flip = 0;
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slouken@0
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175 |
while ( argc > 1 ) {
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slouken@0
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176 |
--argc;
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slouken@0
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177 |
if ( strcmp(argv[argc-1], "-width") == 0 ) {
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slouken@0
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178 |
width = atoi(argv[argc]);
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slouken@0
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179 |
--argc;
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slouken@0
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180 |
} else
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slouken@0
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181 |
if ( strcmp(argv[argc-1], "-height") == 0 ) {
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slouken@0
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182 |
height = atoi(argv[argc]);
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slouken@0
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183 |
--argc;
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slouken@0
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184 |
} else
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slouken@0
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185 |
if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
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slouken@0
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186 |
video_bpp = atoi(argv[argc]);
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slouken@0
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187 |
videoflags &= ~SDL_ANYFORMAT;
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slouken@0
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188 |
--argc;
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slouken@0
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189 |
} else
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slouken@0
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190 |
if ( strcmp(argv[argc], "-fast") == 0 ) {
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slouken@107
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191 |
videoflags = FastestFlags(videoflags, width, height, video_bpp);
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slouken@0
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192 |
} else
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slouken@0
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193 |
if ( strcmp(argv[argc], "-hw") == 0 ) {
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slouken@0
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194 |
videoflags ^= SDL_HWSURFACE;
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slouken@0
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195 |
} else
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slouken@0
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196 |
if ( strcmp(argv[argc], "-flip") == 0 ) {
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slouken@0
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197 |
videoflags ^= SDL_DOUBLEBUF;
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slouken@0
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198 |
} else
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icculus@1214
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199 |
if ( strcmp(argv[argc], "-debugflip") == 0 ) {
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icculus@1214
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200 |
debug_flip ^= 1;
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icculus@1214
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201 |
} else
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slouken@0
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202 |
if ( strcmp(argv[argc], "-fullscreen") == 0 ) {
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slouken@0
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203 |
videoflags ^= SDL_FULLSCREEN;
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slouken@0
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204 |
} else
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slouken@0
|
205 |
if ( isdigit(argv[argc][0]) ) {
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slouken@0
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206 |
numsprites = atoi(argv[argc]);
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slouken@0
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207 |
} else {
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slouken@0
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208 |
fprintf(stderr,
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slouken@0
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209 |
"Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n",
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slouken@0
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210 |
argv[0]);
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icculus@1151
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211 |
quit(1);
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slouken@0
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212 |
}
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slouken@0
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213 |
}
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slouken@0
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214 |
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slouken@0
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215 |
/* Set video mode */
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slouken@0
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216 |
screen = SDL_SetVideoMode(width, height, video_bpp, videoflags);
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slouken@0
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217 |
if ( ! screen ) {
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slouken@0
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218 |
fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
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slouken@0
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219 |
width, height, SDL_GetError());
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icculus@1151
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220 |
quit(2);
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slouken@0
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221 |
}
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slouken@0
|
222 |
|
slouken@0
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223 |
/* Load the sprite */
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slouken@0
|
224 |
if ( LoadSprite(screen, "icon.bmp") < 0 ) {
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icculus@1151
|
225 |
quit(1);
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slouken@0
|
226 |
}
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slouken@0
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227 |
|
slouken@0
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228 |
/* Allocate memory for the sprite info */
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slouken@0
|
229 |
mem = (Uint8 *)malloc(4*sizeof(SDL_Rect)*numsprites);
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slouken@0
|
230 |
if ( mem == NULL ) {
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slouken@0
|
231 |
SDL_FreeSurface(sprite);
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slouken@0
|
232 |
fprintf(stderr, "Out of memory!\n");
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icculus@1151
|
233 |
quit(2);
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slouken@0
|
234 |
}
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slouken@0
|
235 |
sprite_rects = (SDL_Rect *)mem;
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slouken@0
|
236 |
positions = sprite_rects;
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slouken@0
|
237 |
sprite_rects += numsprites;
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slouken@0
|
238 |
velocities = sprite_rects;
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slouken@0
|
239 |
sprite_rects += numsprites;
|
slouken@288
|
240 |
sprite_w = sprite->w;
|
slouken@288
|
241 |
sprite_h = sprite->h;
|
slouken@0
|
242 |
srand(time(NULL));
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slouken@0
|
243 |
for ( i=0; i<numsprites; ++i ) {
|
slouken@288
|
244 |
positions[i].x = rand()%(screen->w - sprite_w);
|
slouken@288
|
245 |
positions[i].y = rand()%(screen->h - sprite_h);
|
slouken@0
|
246 |
positions[i].w = sprite->w;
|
slouken@0
|
247 |
positions[i].h = sprite->h;
|
slouken@0
|
248 |
velocities[i].x = 0;
|
slouken@0
|
249 |
velocities[i].y = 0;
|
slouken@0
|
250 |
while ( ! velocities[i].x && ! velocities[i].y ) {
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slouken@0
|
251 |
velocities[i].x = (rand()%(MAX_SPEED*2+1))-MAX_SPEED;
|
slouken@0
|
252 |
velocities[i].y = (rand()%(MAX_SPEED*2+1))-MAX_SPEED;
|
slouken@0
|
253 |
}
|
slouken@0
|
254 |
}
|
slouken@0
|
255 |
background = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
|
slouken@0
|
256 |
|
slouken@0
|
257 |
/* Print out information about our surfaces */
|
slouken@0
|
258 |
printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel);
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slouken@0
|
259 |
if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
|
slouken@0
|
260 |
printf("Screen is in video memory\n");
|
slouken@0
|
261 |
} else {
|
slouken@0
|
262 |
printf("Screen is in system memory\n");
|
slouken@0
|
263 |
}
|
slouken@0
|
264 |
if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
|
slouken@0
|
265 |
printf("Screen has double-buffering enabled\n");
|
slouken@0
|
266 |
}
|
slouken@0
|
267 |
if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
|
slouken@0
|
268 |
printf("Sprite is in video memory\n");
|
slouken@0
|
269 |
} else {
|
slouken@0
|
270 |
printf("Sprite is in system memory\n");
|
slouken@0
|
271 |
}
|
slouken@0
|
272 |
/* Run a sample blit to trigger blit acceleration */
|
slouken@0
|
273 |
{ SDL_Rect dst;
|
slouken@0
|
274 |
dst.x = 0;
|
slouken@0
|
275 |
dst.y = 0;
|
slouken@0
|
276 |
dst.w = sprite->w;
|
slouken@0
|
277 |
dst.h = sprite->h;
|
slouken@0
|
278 |
SDL_BlitSurface(sprite, NULL, screen, &dst);
|
slouken@0
|
279 |
SDL_FillRect(screen, &dst, background);
|
slouken@0
|
280 |
}
|
slouken@0
|
281 |
if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
|
slouken@0
|
282 |
printf("Sprite blit uses hardware acceleration\n");
|
slouken@0
|
283 |
}
|
slouken@0
|
284 |
if ( (sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
|
slouken@0
|
285 |
printf("Sprite blit uses RLE acceleration\n");
|
slouken@0
|
286 |
}
|
slouken@0
|
287 |
|
slouken@0
|
288 |
/* Loop, blitting sprites and waiting for a keystroke */
|
slouken@0
|
289 |
frames = 0;
|
slouken@0
|
290 |
then = SDL_GetTicks();
|
slouken@0
|
291 |
done = 0;
|
slouken@0
|
292 |
sprites_visible = 0;
|
slouken@0
|
293 |
while ( !done ) {
|
slouken@0
|
294 |
/* Check for events */
|
slouken@0
|
295 |
++frames;
|
slouken@0
|
296 |
while ( SDL_PollEvent(&event) ) {
|
slouken@0
|
297 |
switch (event.type) {
|
slouken@529
|
298 |
case SDL_MOUSEBUTTONDOWN:
|
slouken@529
|
299 |
SDL_WarpMouse(screen->w/2, screen->h/2);
|
slouken@529
|
300 |
break;
|
slouken@0
|
301 |
case SDL_KEYDOWN:
|
slouken@0
|
302 |
/* Any keypress quits the app... */
|
slouken@0
|
303 |
case SDL_QUIT:
|
slouken@0
|
304 |
done = 1;
|
slouken@0
|
305 |
break;
|
slouken@0
|
306 |
default:
|
slouken@0
|
307 |
break;
|
slouken@0
|
308 |
}
|
slouken@0
|
309 |
}
|
slouken@0
|
310 |
MoveSprites(screen, background);
|
slouken@0
|
311 |
}
|
slouken@0
|
312 |
SDL_FreeSurface(sprite);
|
slouken@0
|
313 |
free(mem);
|
slouken@0
|
314 |
|
slouken@0
|
315 |
/* Print out some timing information */
|
slouken@0
|
316 |
now = SDL_GetTicks();
|
slouken@0
|
317 |
if ( now > then ) {
|
slouken@0
|
318 |
printf("%2.2f frames per second\n",
|
slouken@0
|
319 |
((double)frames*1000)/(now-then));
|
slouken@0
|
320 |
}
|
slouken@288
|
321 |
SDL_Quit();
|
slouken@0
|
322 |
return(0);
|
slouken@0
|
323 |
}
|