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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <time.h>
#include <sys/types.h>
#include <unistd.h>
#include "draw.h"
#include "fb.h"
#include "rototiller.h"
#include "starslib.h"
/* Copyright (C) 2017 Philip J. Freeman <elektron@halo.nu> */
static void stars(fb_fragment_t *fragment)
{
static int initialized, z;
static struct universe* u;
struct return_point rp;
int x, y, width = fragment->width, height = fragment->height;
if (!initialized) {
z = 128;
srand(time(NULL) + getpid());
// Initialize the stars lib (and pre-add a bunch of stars)
new_universe(&u, width, height, z);
for(y=0; y<z; y++) {
while (process_point(u, &rp) != 0);
for(x=0; x<rand()%128; x++){
new_point(u);
}
}
initialized = 1;
}
// draw space (or blank the frame, if you prefer)
fb_fragment_zero(fragment);
// draw stars
for (;;) {
int ret = process_point( u, &rp );
if (ret==0) break;
if (ret==1) fb_fragment_put_pixel_unchecked(fragment, rp.x+(width/2), rp.y+(height/2),
makergb(0xFF, 0xFF, 0xFF, (float)rp.opacity/OPACITY_MAX)
);
}
// add stars at horizon
for (x=0; x<rand()%128; x++) {
new_point(u);
}
}
rototiller_renderer_t stars_renderer = {
.render = stars,
.name = "stars",
.description = "basic starfield",
.author = "Philip J Freeman <elektron@halo.nu>",
.license = "GPLv2",
};
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