/*
 * Copyright 2016-2018 Józef Kucia for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifndef __VKD3D_TEST_UTILS_H
#define __VKD3D_TEST_UTILS_H

#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>

struct vec2
{
    float x, y;
};

struct vec4
{
    float x, y, z, w;
};

static inline bool vkd3d_array_reserve(void **elements, size_t *capacity, size_t element_count, size_t element_size)
{
    size_t new_capacity, max_capacity;
    void *new_elements;

    if (element_count <= *capacity)
        return true;

    max_capacity = ~(size_t)0 / element_size;
    if (max_capacity < element_count)
        return false;

    new_capacity = max(*capacity, 4);
    while (new_capacity < element_count && new_capacity <= max_capacity / 2)
        new_capacity *= 2;

    if (new_capacity < element_count)
        new_capacity = element_count;

    if (!(new_elements = realloc(*elements, new_capacity * element_size)))
        return false;

    *elements = new_elements;
    *capacity = new_capacity;

    return true;
}

static bool compare_float(float f, float g, unsigned int ulps)
{
    int x, y;
    union
    {
        float f;
        int i;
    } u;

    u.f = f;
    x = u.i;
    u.f = g;
    y = u.i;

    if (x < 0)
        x = INT_MIN - x;
    if (y < 0)
        y = INT_MIN - y;

    if (abs(x - y) > ulps)
        return false;

    return true;
}

static inline bool compare_vec4(const struct vec4 *v1, const struct vec4 *v2, unsigned int ulps)
{
    return compare_float(v1->x, v2->x, ulps)
            && compare_float(v1->y, v2->y, ulps)
            && compare_float(v1->z, v2->z, ulps)
            && compare_float(v1->w, v2->w, ulps);
}

#endif