vk_descriptors.c

/*
 * Copyright © 2016 Red Hat.
 * Copyright © 2016 Bas Nieuwenhuizen
 *
 * 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 (including the next
 * paragraph) 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.
 */

#include <stdlib.h>
#include <string.h>
#include "vk_descriptors.h"
#include "util/macros.h"

static int
binding_compare(const void* av, const void *bv)
{
   const VkDescriptorSetLayoutBinding *a = (const VkDescriptorSetLayoutBinding*)av;
   const VkDescriptorSetLayoutBinding *b = (const VkDescriptorSetLayoutBinding*)bv;
 
   return (a->binding < b->binding) ? -1 : (a->binding > b->binding) ? 1 : 0;
}
 
VkResult
vk_create_sorted_bindings(const VkDescriptorSetLayoutBinding *bindings, unsigned count,
                          VkDescriptorSetLayoutBinding **sorted_bindings)
{
   if (!count) {
      *sorted_bindings = NULL;
      return VK_SUCCESS;
   }

   *sorted_bindings = malloc(count * sizeof(VkDescriptorSetLayoutBinding));
   if (!*sorted_bindings)
      return VK_ERROR_OUT_OF_HOST_MEMORY;

   memcpy(*sorted_bindings, bindings, count * sizeof(VkDescriptorSetLayoutBinding));
   qsort(*sorted_bindings, count, sizeof(VkDescriptorSetLayoutBinding), binding_compare);
 
   return VK_SUCCESS;
}