layers/vk_layer_extension_utils.cpp

/* Copyright (c) 2015-2016 The Khronos Group Inc.
 * Copyright (c) 2015-2016 Valve Corporation
 * Copyright (c) 2015-2016 LunarG, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and/or associated documentation files (the "Materials"), to
 * deal in the Materials without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Materials, and to permit persons to whom the Materials
 * are furnished to do so, subject to the following conditions:
 *
 * The above copyright notice(s) and this permission notice shall be included
 * in all copies or substantial portions of the Materials.
 *
 * The Materials are Confidential Information as defined by the Khronos
 * Membership Agreement until designated non-confidential by Khronos, at which
 * point this condition clause shall be removed.
 *
 * THE MATERIALS ARE 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 MATERIALS OR THE
 * USE OR OTHER DEALINGS IN THE MATERIALS
 *
 * Author: 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 (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 (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;
}