formats.cpp

/*
* Copyright (c) 2025-2026, NVIDIA CORPORATION.  All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION.
* SPDX-License-Identifier: Apache-2.0
*/

#include <volk.h>

#include "formats.hpp"

namespace nvvk {

VkFormat findSupportedFormat(VkPhysicalDevice physicalDevice, const std::vector<VkFormat>& candidates, VkImageTiling tiling, VkFormatFeatureFlags2 features)
{
  for(const VkFormat format : candidates)
  {
    VkFormatProperties2 props{.sType = VK_STRUCTURE_TYPE_FORMAT_PROPERTIES_2};
    vkGetPhysicalDeviceFormatProperties2(physicalDevice, format, &props);

    if(tiling == VK_IMAGE_TILING_LINEAR && (props.formatProperties.linearTilingFeatures & features) == features)
    {
      return format;
    }
    else if(tiling == VK_IMAGE_TILING_OPTIMAL && (props.formatProperties.optimalTilingFeatures & features) == features)
    {
      return format;
    }
  }
  return VK_FORMAT_UNDEFINED;
}

VkFormat findDepthFormat(VkPhysicalDevice physicalDevice)
{
  return findSupportedFormat(physicalDevice,
                             {VK_FORMAT_D32_SFLOAT, VK_FORMAT_X8_D24_UNORM_PACK32, VK_FORMAT_D24_UNORM_S8_UINT,
                              VK_FORMAT_D32_SFLOAT_S8_UINT, VK_FORMAT_D16_UNORM, VK_FORMAT_D16_UNORM_S8_UINT},
                             VK_IMAGE_TILING_OPTIMAL, VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT);
}

VkFormat findDepthStencilFormat(VkPhysicalDevice physicalDevice)
{
  return findSupportedFormat(physicalDevice, {VK_FORMAT_D24_UNORM_S8_UINT, VK_FORMAT_D32_SFLOAT_S8_UINT, VK_FORMAT_D16_UNORM_S8_UINT},
                             VK_IMAGE_TILING_OPTIMAL, VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT);
}
}  // namespace nvvk