layers/vk_layer_extension_utils.cpp

/*
 * Vulkan
 *
 * Copyright (C) 2015 LunarG, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *   Courtney Goeltzenleuchter <courtney@lunarg.com>
 */

#include "string.h"
#include "vk_layer_extension_utils.h"

#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))

/*
 * This file contains utility functions for layers
 */

VkResult util_GetExtensionProperties(
        const uint32_t count,
        const VkExtensionProperties *layer_extensions,
        uint32_t* pCount,
        VkExtensionProperties* pProperties)
{
    uint32_t copy_size;

    if (pCount == NULL) {
        return VK_ERROR_INVALID_POINTER;
    }

    if (pProperties == NULL || layer_extensions == NULL) {
        *pCount = count;
        return VK_SUCCESS;
    }

    copy_size = *pCount < count ? *pCount : count;
    memcpy(pProperties, layer_extensions, copy_size * sizeof(VkExtensionProperties));
    *pCount = copy_size;
    if (copy_size < count) {
        return VK_INCOMPLETE;
    }

    return VK_SUCCESS;
}

VkResult util_GetLayerProperties(
        const uint32_t count,
        const VkLayerProperties *layer_properties,
        uint32_t* pCount,
        VkLayerProperties* pProperties)
{
    uint32_t copy_size;

    if (pCount == NULL) {
        return VK_ERROR_INVALID_POINTER;
    }

    if (pProperties == NULL || layer_properties == NULL) {
        *pCount = count;
        return VK_SUCCESS;
    }

    copy_size = *pCount < count ? *pCount : count;
    memcpy(pProperties, layer_properties, copy_size * sizeof(VkLayerProperties));
    *pCount = copy_size;
    if (copy_size < count) {
        return VK_INCOMPLETE;
    }

    return VK_SUCCESS;
}