/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright (C) 2021 KikooDX */

#include "util.h"
#include <gint/display.h>

float
square(float x)
{
	return x * x;
}

float
isquare(float x)
{
	return 1.0 - square(1.0 - x);
}

float
abs(float x)
{
	return (x > 0) ? x : -x;
}

int
sign(float x)
{
	return 1 * (x > 0) - 1 * (x < 0);
}

/* courtesy of Lephenixnoir */
void
darken_vram(void)
{
	int i;
	for (i = 0; i < DWIDTH * DHEIGHT; i++)
		gint_vram[i] = (gint_vram[i] & 0xf7de) >> 1;
}