| /* Copyright (c) 2023 Valve Corporation |
| * Copyright (c) 2023 LunarG, Inc. |
| * |
| * 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. |
| */ |
| |
| #include "ray_tracing_utils.h" |
| |
| #include <cassert> |
| #include <vector> |
| |
| #include "generated/layer_chassis_dispatch.h" |
| #include <vulkan/utility/vk_struct_helper.hpp> |
| |
| namespace rt { |
| VkDeviceSize ComputeScratchSize(const VkDevice device, const VkAccelerationStructureBuildGeometryInfoKHR &build_info, |
| const VkAccelerationStructureBuildRangeInfoKHR *range_infos) { |
| std::vector<uint32_t> primitive_counts(build_info.geometryCount); |
| primitive_counts.reserve(build_info.geometryCount); |
| for (uint32_t build_range_i = 0; build_range_i < build_info.geometryCount; build_range_i++) { |
| primitive_counts[build_range_i] = range_infos[build_range_i].primitiveCount; |
| } |
| VkAccelerationStructureBuildSizesInfoKHR size_info = vku::InitStructHelper(); |
| DispatchGetAccelerationStructureBuildSizesKHR(device, VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR, &build_info, |
| primitive_counts.data(), &size_info); |
| switch (build_info.mode) { |
| case VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR: |
| return size_info.buildScratchSize; |
| case VK_BUILD_ACCELERATION_STRUCTURE_MODE_UPDATE_KHR: |
| return size_info.updateScratchSize; |
| default: |
| assert(false); |
| return static_cast<VkDeviceSize>(0); |
| break; |
| } |
| } |
| } // namespace rt |