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#include "../graphics.c"
#define SCALE_LIMIT (0.9)
f64 view_x = 0.;
f64 view_y = 0.;
f64 view_s = 1.;
f64 cx = -.771;
f64 cy = .1005;
f64 radius = 2.;
i64 limit = 1024;
i64 time_0;
void inc_f64(f64 *x, i8 s) {
u64 *u = (u64 *) x;
if (((*u >> 52) & 2047) == 2047)
return;
*u += *x > 0 ? s : -s;
}
void apply_scale(f64 delta) {
while (delta > SCALE_LIMIT) {
apply_scale(SCALE_LIMIT);
delta -= SCALE_LIMIT;
}
while (delta < -SCALE_LIMIT) {
apply_scale(-SCALE_LIMIT);
delta += SCALE_LIMIT;
}
f64 ds = view_s * delta * .1;
if (view_s + ds <= 0.0)
return;
f64 dx = (g_platform.cursor_x * 1. - g_platform.real_width * .5);
f64 dy = (g_platform.cursor_y * 1. - g_platform.real_height * .5);
view_x -= view_s * dx;
view_y -= view_s * dy;
if (view_s == view_s + ds)
inc_f64(&view_s, ds > 0 ? 1 : -1);
else
view_s += ds;
view_x += view_s * dx;
view_y += view_s * dy;
}
void update_and_render_frame(void) {
i32 num_events = handle_main_window_events();
i64 time_elapsed = current_utc_time_in_milliseconds() - time_0;
time_0 += time_elapsed;
b8 left = g_platform.key_down[KEY_LEFT];
b8 right = g_platform.key_down[KEY_RIGHT];
b8 up = g_platform.key_down[KEY_UP];
b8 down = g_platform.key_down[KEY_DOWN];
if (!left && !right && !up && !down && num_events == 0) {
suspend_thread_for_milliseconds(1);
return;
}
if (g_platform.key_pressed[KEY_ESCAPE]) {
view_x = 0.;
view_y = 0.;
view_s = 1.;
}
f64 d = (g_platform.key_down[MOD_CTRL] ? .00005 : .001) * view_s * time_elapsed;
if (left) { cx -= d; cy -= d; }
if (right) { cx += d; cy += d; }
if (up) { cx += d; cy -= d; }
if (down) { cx -= d; cy += d; }
if (g_platform.key_down[BUTTON_LEFT]) {
view_x += g_platform.cursor_dx * view_s;
view_y += g_platform.cursor_dy * view_s;
}
if (g_platform.wheel_dy != 0.) {
apply_scale(g_platform.wheel_dy / 2.0);
apply_scale(g_platform.wheel_dy / 2.0);
}
for (i32 j = 0; j < g_platform.frame_height; ++j)
for (i32 i = 0; i < g_platform.frame_width; ++i) {
f64 kx = ((f64) g_platform.real_width) / g_platform.frame_width;
f64 ky = ((f64) g_platform.real_height) / g_platform.frame_height;
f64 x = .003 * ((i - (g_platform.frame_width - 1) * .5) * kx * view_s - view_x);
f64 y = .003 * ((j - (g_platform.frame_height - 1) * .5) * ky * view_s - view_y);
i64 n = 0;
for (; x * x + y * y < radius * radius && n < limit; ++n) {
f64 z = x * x - y * y;
y = 2. * x * y + cy;
x = z + cx;
}
u32 c;
if (n == limit)
c = 0;
else
c = 0xffffff - n * 8 - n * 256 * 4;
g_platform.pixels[j * g_platform.frame_width + i] = vec4_from_vec3_f32(rgb_f32_from_u32(c), 1.f);
}
render_main_window_frame();
}
i32 main(i32 argc, c8 **argv) {
(void) argc;
(void) argv;
g_platform = (Platform) {
.title = "Julia Set",
};
time_0 = current_utc_time_in_milliseconds();
run_main_window_event_loop();
return 0;
}
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