// Regulating game speed

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <allegro.h>
#include "0943.h"
#include "0943i.h"

int actual_cycle;
int end_game;
int pixels;
fixed circle_pos;
fixed add_pos;

BITMAP *dblbuffer;

void game_loop(void)
{
    do {
	get_keyboard_input();

	draw_one_frame();                       /* First do some graphics,  */
	while (target_cycle > actual_cycle)     /* then until up-to-date... */
	    do_one_game_cycle();                /* ... do game cycles.      */
    } while (!end_game);
}

int main(void)
{
    init_example();

    game_loop();

    shutdown();

    return 0;
}
END_OF_MAIN()

void draw_one_frame(void)
{
    int f;

    clear(dblbuffer);
    for (f = 0; f < pixels; f++)
	dblbuffer->line[rand() % SCREEN_H][rand() % SCREEN_W] = rand() % 256;

    circlefill(dblbuffer, fixtoi(circle_pos), SCREEN_H / 2, 10, 13);

    textout(dblbuffer, font, "Press ESC to exit", 0, 0, 15);
    textout(dblbuffer, font, "+/- to increase/decrease pixels", 0, 10, 15);
    textprintf(dblbuffer, font, 0, 20, 15, "Number of pixels: %d", pixels);
    textprintf(dblbuffer, font, 0, 30, 15, "Frames per second: %d", last_fps);

    vsync();
    blit(dblbuffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H);
    frame_counter++;
}

void do_one_game_cycle(void)
{
    circle_pos += add_pos;

    if (fixtoi(circle_pos) < 10 || fixtoi(circle_pos) > 310)
	add_pos *= -1;

    actual_cycle++;
}

void get_keyboard_input(void)
{
    if (key[KEY_ESC])
	end_game++;
    if (key[KEY_PLUS_PAD])
	pixels += 100;
    if (key[KEY_MINUS_PAD] && pixels > 100)
	pixels -= 100;
}