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C-/C++-Quelltext

#include <allegro.h>
#include <string>

using std::string;
volatile int timerCounter = 0;
static void timerCounterUpdater() {
    timerCounter++;
} END_OF_STATIC_FUNCTION(timerCounterUpdater);
 

void init() {
    allegro_init();
    install_keyboard();

    LOCK_FUNCTION(timerCounterUpdater);
    LOCK_VARIABLE(timerCounter);
    install_int_ex(timerCounterUpdater, BPS_TO_TIMER(60));
}

int main(int argc, char **argv) {
    init();
    set_color_depth(32);
    set_gfx_mode(GFX_AUTODETECT_WINDOWED, 800, 800, 0, 0);
    BITMAP * logo       = load_bitmap("allegro.tga", NULL);
    BITMAP * doublebuffer = create_bitmap(800, 800);
    int x  = 0;
    int y  = 0;
    int dx = 1;
    int dy = 1;
    int maxSkip = 4;
    int curSkip = 0;
    bool needRefresh = false;
    while (!keypressed()) {
            curSkip = 0;
        if (timerCounter > 0) {
            do {

        if (x + dx < 0) {
            dx *= -1;
        } else if (x + logo->w >= SCREEN_W) {
            dx *= -1;
        }
        // Oberer und unterer Rand
        if (y + dy < 0) {
            dy *= -1;
        } else if (y + logo->h >= SCREEN_H) {
            dy *= -1;
        }
        x+= dx;
        y+= dy;
                timerCounter--;
                curSkip++;
                if (curSkip >= maxSkip) {
                    timerCounter = 0;
                    break;
                }
            } while(timerCounter > 0);
            needRefresh = true;
        }
        if (needRefresh) {

            acquire_bitmap(doublebuffer);
            clear(doublebuffer);
            blit(
    logo, doublebuffer,
    x, y,
    0, 0,
    logo->w,
    logo->h
);
 
            release_bitmap(doublebuffer);
            blit(
                doublebuffer, screen,
                0, 0, 0, 0,
                SCREEN_W, SCREEN_H
            );
            needRefresh = false;
        }
    }
} END_OF_MAIN();