903 lines
41 KiB
C++
903 lines
41 KiB
C++
/*
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* Vulkan Example - Basic hardware accelerated ray tracing example using VK_KHR_ray_traying
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*
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* Copyright (C) 2019-2020 by Sascha Willems - www.saschawillems.de
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*
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* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
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*/
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#define VK_ENABLE_BETA_EXTENSIONS
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#include "vulkanexamplebase.h"
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// Holds data for a ray tracing scratch buffer that is used as a temporary storage
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struct RayTracingScratchBuffer
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{
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uint64_t deviceAddress = 0;
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VkBuffer buffer = VK_NULL_HANDLE;
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VkDeviceMemory memory = VK_NULL_HANDLE;
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};
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// Holds data for a memory object bound to an acceleration structure
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struct RayTracingObjectMemory
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{
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uint64_t deviceAddress = 0;
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VkDeviceMemory memory = VK_NULL_HANDLE;
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};
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// Ray tracing acceleration structure
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struct AccelerationStructure {
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VkAccelerationStructureKHR accelerationStructure;
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uint64_t handle;
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RayTracingObjectMemory objectMemory;
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};
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// Indices for the different ray tracing shader types used in this example
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#define INDEX_RAYGEN_GROUP 0
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#define INDEX_MISS_GROUP 1
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#define INDEX_CLOSEST_HIT_GROUP 2
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class VulkanExample : public VulkanExampleBase
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{
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public:
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PFN_vkGetBufferDeviceAddressKHR vkGetBufferDeviceAddressKHR;
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PFN_vkBindAccelerationStructureMemoryKHR vkBindAccelerationStructureMemoryKHR;
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PFN_vkCreateAccelerationStructureKHR vkCreateAccelerationStructureKHR;
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PFN_vkDestroyAccelerationStructureKHR vkDestroyAccelerationStructureKHR;
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PFN_vkGetAccelerationStructureMemoryRequirementsKHR vkGetAccelerationStructureMemoryRequirementsKHR;
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PFN_vkCmdBuildAccelerationStructureKHR vkCmdBuildAccelerationStructureKHR;
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PFN_vkBuildAccelerationStructureKHR vkBuildAccelerationStructureKHR;
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PFN_vkGetAccelerationStructureDeviceAddressKHR vkGetAccelerationStructureDeviceAddressKHR;
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PFN_vkCmdTraceRaysKHR vkCmdTraceRaysKHR;
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PFN_vkGetRayTracingShaderGroupHandlesKHR vkGetRayTracingShaderGroupHandlesKHR;
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PFN_vkCreateRayTracingPipelinesKHR vkCreateRayTracingPipelinesKHR;
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VkPhysicalDeviceRayTracingPropertiesKHR rayTracingProperties{};
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VkPhysicalDeviceRayTracingFeaturesKHR rayTracingFeatures{};
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VkPhysicalDeviceBufferDeviceAddressFeatures enabledBufferDeviceAddresFeatures{};
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VkPhysicalDeviceRayTracingFeaturesKHR enabledRayTracingFeatures{};
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AccelerationStructure bottomLevelAS;
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AccelerationStructure topLevelAS;
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vks::Buffer vertexBuffer;
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vks::Buffer indexBuffer;
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uint32_t indexCount;
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std::vector<VkRayTracingShaderGroupCreateInfoKHR> shaderGroups{};
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vks::Buffer shaderBindingTable;
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struct StorageImage {
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VkDeviceMemory memory;
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VkImage image;
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VkImageView view;
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VkFormat format;
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} storageImage;
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struct UniformData {
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glm::mat4 viewInverse;
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glm::mat4 projInverse;
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} uniformData;
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vks::Buffer ubo;
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VkPipeline pipeline;
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VkPipelineLayout pipelineLayout;
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VkDescriptorSet descriptorSet;
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VkDescriptorSetLayout descriptorSetLayout;
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VulkanExample() : VulkanExampleBase()
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{
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title = "Ray tracing basic";
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settings.overlay = true;
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camera.type = Camera::CameraType::lookat;
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camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 512.0f);
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camera.setRotation(glm::vec3(0.0f, 0.0f, 0.0f));
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camera.setTranslation(glm::vec3(0.0f, 0.0f, -2.5f));
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// Enable instance and device extensions required to use VK_KHR_ray_tracing
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enabledInstanceExtensions.push_back(VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_KHR_MAINTENANCE3_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_KHR_GET_MEMORY_REQUIREMENTS_2_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_KHR_RAY_TRACING_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_KHR_BUFFER_DEVICE_ADDRESS_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_KHR_DEFERRED_HOST_OPERATIONS_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_EXT_DESCRIPTOR_INDEXING_EXTENSION_NAME);
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enabledDeviceExtensions.push_back(VK_KHR_PIPELINE_LIBRARY_EXTENSION_NAME);
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// We require Vulkan 1.2 for ray tracing
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apiVersion = VK_API_VERSION_1_2;
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}
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~VulkanExample()
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{
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vkDestroyPipeline(device, pipeline, nullptr);
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vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
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vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
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vkDestroyImageView(device, storageImage.view, nullptr);
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vkDestroyImage(device, storageImage.image, nullptr);
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vkFreeMemory(device, storageImage.memory, nullptr);
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vkDestroyAccelerationStructureKHR(device, bottomLevelAS.accelerationStructure, nullptr);
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vkDestroyAccelerationStructureKHR(device, topLevelAS.accelerationStructure, nullptr);
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vertexBuffer.destroy();
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indexBuffer.destroy();
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shaderBindingTable.destroy();
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ubo.destroy();
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deleteObjectMemory(bottomLevelAS.objectMemory);
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deleteObjectMemory(topLevelAS.objectMemory);
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}
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/*
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Create a scratch buffer to hold temporary data for a ray tracing acceleration structure
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*/
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RayTracingScratchBuffer createScratchBuffer(VkAccelerationStructureKHR accelerationStructure)
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{
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RayTracingScratchBuffer scratchBuffer{};
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VkMemoryRequirements2 memoryRequirements2{};
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memoryRequirements2.sType = VK_STRUCTURE_TYPE_MEMORY_REQUIREMENTS_2;
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VkAccelerationStructureMemoryRequirementsInfoKHR accelerationStructureMemoryRequirements{};
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accelerationStructureMemoryRequirements.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_MEMORY_REQUIREMENTS_INFO_KHR;
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accelerationStructureMemoryRequirements.type = VK_ACCELERATION_STRUCTURE_MEMORY_REQUIREMENTS_TYPE_BUILD_SCRATCH_KHR;
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accelerationStructureMemoryRequirements.buildType = VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR;
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accelerationStructureMemoryRequirements.accelerationStructure = accelerationStructure;
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vkGetAccelerationStructureMemoryRequirementsKHR(device, &accelerationStructureMemoryRequirements, &memoryRequirements2);
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VkBufferCreateInfo bufferCI{};
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bufferCI.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
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bufferCI.size = memoryRequirements2.memoryRequirements.size;
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bufferCI.usage = VK_BUFFER_USAGE_RAY_TRACING_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT;
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bufferCI.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
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VK_CHECK_RESULT(vkCreateBuffer(device, &bufferCI, nullptr, &scratchBuffer.buffer));
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VkMemoryRequirements memoryRequirements{};
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vkGetBufferMemoryRequirements(device, scratchBuffer.buffer, &memoryRequirements);
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VkMemoryAllocateFlagsInfo memoryAllocateFI{};
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memoryAllocateFI.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_FLAGS_INFO;
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memoryAllocateFI.flags = VK_MEMORY_ALLOCATE_DEVICE_ADDRESS_BIT_KHR;
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VkMemoryAllocateInfo memoryAI{};
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memoryAI.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
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memoryAI.pNext = &memoryAllocateFI;
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memoryAI.allocationSize = memoryRequirements.size;
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memoryAI.memoryTypeIndex = vulkanDevice->getMemoryType(memoryRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
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VK_CHECK_RESULT(vkAllocateMemory(device, &memoryAI, nullptr, &scratchBuffer.memory));
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VK_CHECK_RESULT(vkBindBufferMemory(device, scratchBuffer.buffer, scratchBuffer.memory, 0));
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VkBufferDeviceAddressInfoKHR buffer_device_address_info{};
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buffer_device_address_info.sType = VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO;
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buffer_device_address_info.buffer = scratchBuffer.buffer;
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scratchBuffer.deviceAddress = vkGetBufferDeviceAddressKHR(device, &buffer_device_address_info);
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return scratchBuffer;
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}
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void deleteScratchBuffer(RayTracingScratchBuffer& scratchBuffer)
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{
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if (scratchBuffer.memory != VK_NULL_HANDLE) {
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vkFreeMemory(device, scratchBuffer.memory, nullptr);
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}
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if (scratchBuffer.buffer != VK_NULL_HANDLE) {
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vkDestroyBuffer(device, scratchBuffer.buffer, nullptr);
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}
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}
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/*
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Allocate memory that will be attached to a ray tracing acceleration structure
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*/
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RayTracingObjectMemory createObjectMemory(VkAccelerationStructureKHR acceleration_structure)
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{
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RayTracingObjectMemory objectMemory{};
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VkMemoryRequirements2 memoryRequirements2{};
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memoryRequirements2.sType = VK_STRUCTURE_TYPE_MEMORY_REQUIREMENTS_2;
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VkAccelerationStructureMemoryRequirementsInfoKHR accelerationStructureMemoryRequirements{};
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accelerationStructureMemoryRequirements.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_MEMORY_REQUIREMENTS_INFO_KHR;
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accelerationStructureMemoryRequirements.type = VK_ACCELERATION_STRUCTURE_MEMORY_REQUIREMENTS_TYPE_OBJECT_KHR;
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accelerationStructureMemoryRequirements.buildType = VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR;
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accelerationStructureMemoryRequirements.accelerationStructure = acceleration_structure;
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vkGetAccelerationStructureMemoryRequirementsKHR(device, &accelerationStructureMemoryRequirements, &memoryRequirements2);
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VkMemoryRequirements memoryRequirements = memoryRequirements2.memoryRequirements;
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VkMemoryAllocateInfo memoryAI{};
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memoryAI.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
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memoryAI.allocationSize = memoryRequirements.size;
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memoryAI.memoryTypeIndex = vulkanDevice->getMemoryType(memoryRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
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VK_CHECK_RESULT(vkAllocateMemory(device, &memoryAI, nullptr, &objectMemory.memory));
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return objectMemory;
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}
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void deleteObjectMemory(RayTracingObjectMemory& objectMemory)
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{
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if (objectMemory.memory != VK_NULL_HANDLE) {
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vkFreeMemory(device, objectMemory.memory, nullptr);
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}
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}
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/*
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Gets the device address from a buffer that's required for some of the buffers used for ray tracing
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*/
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uint64_t getBufferDeviceAddress(VkBuffer buffer)
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{
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VkBufferDeviceAddressInfoKHR bufferDeviceAI{};
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bufferDeviceAI.sType = VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO;
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bufferDeviceAI.buffer = buffer;
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return vkGetBufferDeviceAddressKHR(device, &bufferDeviceAI);
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}
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/*
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Set up a storage image that the ray generation shader will be writing to
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*/
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void createStorageImage()
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{
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VkImageCreateInfo image = vks::initializers::imageCreateInfo();
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image.imageType = VK_IMAGE_TYPE_2D;
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image.format = swapChain.colorFormat;
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image.extent.width = width;
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image.extent.height = height;
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image.extent.depth = 1;
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image.mipLevels = 1;
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image.arrayLayers = 1;
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image.samples = VK_SAMPLE_COUNT_1_BIT;
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image.tiling = VK_IMAGE_TILING_OPTIMAL;
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image.usage = VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_STORAGE_BIT;
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image.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
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VK_CHECK_RESULT(vkCreateImage(device, &image, nullptr, &storageImage.image));
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VkMemoryRequirements memReqs;
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vkGetImageMemoryRequirements(device, storageImage.image, &memReqs);
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VkMemoryAllocateInfo memoryAllocateInfo = vks::initializers::memoryAllocateInfo();
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memoryAllocateInfo.allocationSize = memReqs.size;
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memoryAllocateInfo.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
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VK_CHECK_RESULT(vkAllocateMemory(device, &memoryAllocateInfo, nullptr, &storageImage.memory));
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VK_CHECK_RESULT(vkBindImageMemory(device, storageImage.image, storageImage.memory, 0));
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VkImageViewCreateInfo colorImageView = vks::initializers::imageViewCreateInfo();
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colorImageView.viewType = VK_IMAGE_VIEW_TYPE_2D;
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colorImageView.format = swapChain.colorFormat;
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colorImageView.subresourceRange = {};
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colorImageView.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
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colorImageView.subresourceRange.baseMipLevel = 0;
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colorImageView.subresourceRange.levelCount = 1;
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colorImageView.subresourceRange.baseArrayLayer = 0;
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colorImageView.subresourceRange.layerCount = 1;
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colorImageView.image = storageImage.image;
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VK_CHECK_RESULT(vkCreateImageView(device, &colorImageView, nullptr, &storageImage.view));
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VkCommandBuffer cmdBuffer = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
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vks::tools::setImageLayout(cmdBuffer, storageImage.image,
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VK_IMAGE_LAYOUT_UNDEFINED,
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VK_IMAGE_LAYOUT_GENERAL,
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{ VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 });
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vulkanDevice->flushCommandBuffer(cmdBuffer, queue);
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}
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/*
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Create the bottom level acceleration structure contains the scene's actual geometry (vertices, triangles)
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*/
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void createBottomLevelAccelerationStructure()
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{
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// Setup vertices for a single triangle
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struct Vertex {
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float pos[3];
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};
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std::vector<Vertex> vertices = {
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{ { 1.0f, 1.0f, 0.0f } },
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{ { -1.0f, 1.0f, 0.0f } },
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{ { 0.0f, -1.0f, 0.0f } }
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};
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// Setup indices
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std::vector<uint32_t> indices = { 0, 1, 2 };
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indexCount = static_cast<uint32_t>(indices.size());
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// Create buffers
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// For the sake of simplicity we won't stage the vertex data to the GPU memory
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// Vertex buffer
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VK_CHECK_RESULT(vulkanDevice->createBuffer(
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VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT,
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VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
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&vertexBuffer,
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vertices.size() * sizeof(Vertex),
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vertices.data()));
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// Index buffer
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VK_CHECK_RESULT(vulkanDevice->createBuffer(
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VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT,
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VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
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&indexBuffer,
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indices.size() * sizeof(uint32_t),
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indices.data()));
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VkDeviceOrHostAddressConstKHR vertexBufferDeviceAddress{};
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VkDeviceOrHostAddressConstKHR indexBufferDeviceAddress{};
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vertexBufferDeviceAddress.deviceAddress = getBufferDeviceAddress(vertexBuffer.buffer);
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indexBufferDeviceAddress.deviceAddress = getBufferDeviceAddress(indexBuffer.buffer);
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VkAccelerationStructureCreateGeometryTypeInfoKHR accelerationCreateGeometryInfo{};
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accelerationCreateGeometryInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_GEOMETRY_TYPE_INFO_KHR;
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accelerationCreateGeometryInfo.geometryType = VK_GEOMETRY_TYPE_TRIANGLES_KHR;
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accelerationCreateGeometryInfo.maxPrimitiveCount = 1;
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accelerationCreateGeometryInfo.indexType = VK_INDEX_TYPE_UINT32;
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accelerationCreateGeometryInfo.maxVertexCount = static_cast<uint32_t>(vertices.size());
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accelerationCreateGeometryInfo.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
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accelerationCreateGeometryInfo.allowsTransforms = VK_FALSE;
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VkAccelerationStructureCreateInfoKHR accelerationCI{};
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accelerationCI.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR;
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accelerationCI.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
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accelerationCI.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
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accelerationCI.maxGeometryCount = 1;
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accelerationCI.pGeometryInfos = &accelerationCreateGeometryInfo;
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VK_CHECK_RESULT(vkCreateAccelerationStructureKHR(device, &accelerationCI, nullptr, &bottomLevelAS.accelerationStructure));
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// Bind object memory to the top level acceleration structure
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bottomLevelAS.objectMemory = createObjectMemory(bottomLevelAS.accelerationStructure);
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VkBindAccelerationStructureMemoryInfoKHR bindAccelerationMemoryInfo{};
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bindAccelerationMemoryInfo.sType = VK_STRUCTURE_TYPE_BIND_ACCELERATION_STRUCTURE_MEMORY_INFO_KHR;
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bindAccelerationMemoryInfo.accelerationStructure = bottomLevelAS.accelerationStructure;
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bindAccelerationMemoryInfo.memory = bottomLevelAS.objectMemory.memory;
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VK_CHECK_RESULT(vkBindAccelerationStructureMemoryKHR(device, 1, &bindAccelerationMemoryInfo));
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VkAccelerationStructureGeometryKHR accelerationStructureGeometry{};
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accelerationStructureGeometry.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR;
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accelerationStructureGeometry.flags = VK_GEOMETRY_OPAQUE_BIT_KHR;
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accelerationStructureGeometry.geometryType = VK_GEOMETRY_TYPE_TRIANGLES_KHR;
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accelerationStructureGeometry.geometry.triangles.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_TRIANGLES_DATA_KHR;
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accelerationStructureGeometry.geometry.triangles.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
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accelerationStructureGeometry.geometry.triangles.vertexData.deviceAddress = vertexBufferDeviceAddress.deviceAddress;
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accelerationStructureGeometry.geometry.triangles.vertexStride = sizeof(Vertex);
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accelerationStructureGeometry.geometry.triangles.indexType = VK_INDEX_TYPE_UINT32;
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accelerationStructureGeometry.geometry.triangles.indexData.deviceAddress = indexBufferDeviceAddress.deviceAddress;
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std::vector<VkAccelerationStructureGeometryKHR> acceleration_geometries = { accelerationStructureGeometry };
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VkAccelerationStructureGeometryKHR* acceleration_structure_geometries = acceleration_geometries.data();
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// Create a small scratch buffer used during build of the bottom level acceleration structure
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RayTracingScratchBuffer scratchBuffer = createScratchBuffer(bottomLevelAS.accelerationStructure);
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VkAccelerationStructureBuildGeometryInfoKHR accelerationBuildGeometryInfo{};
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accelerationBuildGeometryInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR;
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accelerationBuildGeometryInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
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accelerationBuildGeometryInfo.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
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accelerationBuildGeometryInfo.update = VK_FALSE;
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accelerationBuildGeometryInfo.dstAccelerationStructure = bottomLevelAS.accelerationStructure;
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accelerationBuildGeometryInfo.geometryArrayOfPointers = VK_FALSE;
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accelerationBuildGeometryInfo.geometryCount = 1;
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accelerationBuildGeometryInfo.ppGeometries = &acceleration_structure_geometries;
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accelerationBuildGeometryInfo.scratchData.deviceAddress = scratchBuffer.deviceAddress;
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VkAccelerationStructureBuildOffsetInfoKHR accelerationBuildOffsetInfo{};
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accelerationBuildOffsetInfo.primitiveCount = 1;
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accelerationBuildOffsetInfo.primitiveOffset = 0x0;
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accelerationBuildOffsetInfo.firstVertex = 0;
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accelerationBuildOffsetInfo.transformOffset = 0x0;
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std::vector<VkAccelerationStructureBuildOffsetInfoKHR*> accelerationBuildOffsets = { &accelerationBuildOffsetInfo };
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if (rayTracingFeatures.rayTracingHostAccelerationStructureCommands)
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{
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// Implementation supports building acceleration structure building on host
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VK_CHECK_RESULT(vkBuildAccelerationStructureKHR(device, 1, &accelerationBuildGeometryInfo, accelerationBuildOffsets.data()));
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}
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else
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{
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// Acceleration structure needs to be build on the device
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VkCommandBuffer commandBuffer = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
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vkCmdBuildAccelerationStructureKHR(commandBuffer, 1, &accelerationBuildGeometryInfo, accelerationBuildOffsets.data());
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vulkanDevice->flushCommandBuffer(commandBuffer, queue);
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}
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VkAccelerationStructureDeviceAddressInfoKHR accelerationDeviceAddressInfo{};
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accelerationDeviceAddressInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_DEVICE_ADDRESS_INFO_KHR;
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accelerationDeviceAddressInfo.accelerationStructure = bottomLevelAS.accelerationStructure;
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bottomLevelAS.handle = vkGetAccelerationStructureDeviceAddressKHR(device, &accelerationDeviceAddressInfo);
|
|
|
|
deleteScratchBuffer(scratchBuffer);
|
|
}
|
|
|
|
/*
|
|
The top level acceleration structure contains the scene's object instances
|
|
*/
|
|
void createTopLevelAccelerationStructure()
|
|
{
|
|
VkAccelerationStructureCreateGeometryTypeInfoKHR accelerationCreateGeometryInfo{};
|
|
accelerationCreateGeometryInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_GEOMETRY_TYPE_INFO_KHR;
|
|
accelerationCreateGeometryInfo.geometryType = VK_GEOMETRY_TYPE_INSTANCES_KHR;
|
|
accelerationCreateGeometryInfo.maxPrimitiveCount = 1;
|
|
accelerationCreateGeometryInfo.allowsTransforms = VK_FALSE;
|
|
|
|
VkAccelerationStructureCreateInfoKHR accelerationCI{};
|
|
accelerationCI.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR;
|
|
accelerationCI.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR;
|
|
accelerationCI.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
|
|
accelerationCI.maxGeometryCount = 1;
|
|
accelerationCI.pGeometryInfos = &accelerationCreateGeometryInfo;
|
|
VK_CHECK_RESULT(vkCreateAccelerationStructureKHR(device, &accelerationCI, nullptr, &topLevelAS.accelerationStructure));
|
|
|
|
// Bind object memory to the top level acceleration structure
|
|
topLevelAS.objectMemory = createObjectMemory(topLevelAS.accelerationStructure);
|
|
|
|
VkBindAccelerationStructureMemoryInfoKHR bindAccelerationMemoryInfo{};
|
|
bindAccelerationMemoryInfo.sType = VK_STRUCTURE_TYPE_BIND_ACCELERATION_STRUCTURE_MEMORY_INFO_KHR;
|
|
bindAccelerationMemoryInfo.accelerationStructure = topLevelAS.accelerationStructure;
|
|
bindAccelerationMemoryInfo.memory = topLevelAS.objectMemory.memory;
|
|
VK_CHECK_RESULT(vkBindAccelerationStructureMemoryKHR(device, 1, &bindAccelerationMemoryInfo));
|
|
|
|
VkTransformMatrixKHR transform_matrix = {
|
|
1.0f, 0.0f, 0.0f, 0.0f,
|
|
0.0f, 1.0f, 0.0f, 0.0f,
|
|
0.0f, 0.0f, 1.0f, 0.0f };
|
|
|
|
VkAccelerationStructureInstanceKHR instance{};
|
|
instance.transform = transform_matrix;
|
|
instance.instanceCustomIndex = 0;
|
|
instance.mask = 0xFF;
|
|
instance.instanceShaderBindingTableRecordOffset = 0;
|
|
instance.flags = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR;
|
|
instance.accelerationStructureReference = bottomLevelAS.handle;
|
|
|
|
// Buffer for instance data
|
|
vks::Buffer instancesBuffer;
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT,
|
|
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
|
|
&instancesBuffer,
|
|
sizeof(instance),
|
|
&instance));
|
|
|
|
VkDeviceOrHostAddressConstKHR instance_data_device_address{};
|
|
instance_data_device_address.deviceAddress = getBufferDeviceAddress(instancesBuffer.buffer);
|
|
|
|
VkAccelerationStructureGeometryKHR accelerationStructureGeometry{};
|
|
accelerationStructureGeometry.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR;
|
|
accelerationStructureGeometry.flags = VK_GEOMETRY_OPAQUE_BIT_KHR;
|
|
accelerationStructureGeometry.geometryType = VK_GEOMETRY_TYPE_INSTANCES_KHR;
|
|
accelerationStructureGeometry.geometry.instances.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_INSTANCES_DATA_KHR;
|
|
accelerationStructureGeometry.geometry.instances.arrayOfPointers = VK_FALSE;
|
|
accelerationStructureGeometry.geometry.instances.data.deviceAddress = instance_data_device_address.deviceAddress;
|
|
|
|
std::vector<VkAccelerationStructureGeometryKHR> acceleration_geometries = { accelerationStructureGeometry };
|
|
VkAccelerationStructureGeometryKHR* acceleration_structure_geometries = acceleration_geometries.data();
|
|
|
|
// Create a small scratch buffer used during build of the top level acceleration structure
|
|
RayTracingScratchBuffer scratchBuffer = createScratchBuffer(topLevelAS.accelerationStructure);
|
|
|
|
VkAccelerationStructureBuildGeometryInfoKHR accelerationBuildGeometryInfo{};
|
|
accelerationBuildGeometryInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR;
|
|
accelerationBuildGeometryInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR;
|
|
accelerationBuildGeometryInfo.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
|
|
accelerationBuildGeometryInfo.update = VK_FALSE;
|
|
accelerationBuildGeometryInfo.srcAccelerationStructure = VK_NULL_HANDLE;
|
|
accelerationBuildGeometryInfo.dstAccelerationStructure = topLevelAS.accelerationStructure;
|
|
accelerationBuildGeometryInfo.geometryArrayOfPointers = VK_FALSE;
|
|
accelerationBuildGeometryInfo.geometryCount = 1;
|
|
accelerationBuildGeometryInfo.ppGeometries = &acceleration_structure_geometries;
|
|
accelerationBuildGeometryInfo.scratchData.deviceAddress = scratchBuffer.deviceAddress;
|
|
|
|
VkAccelerationStructureBuildOffsetInfoKHR accelerationBuildOffsetInfo{};
|
|
accelerationBuildOffsetInfo.primitiveCount = 1;
|
|
accelerationBuildOffsetInfo.primitiveOffset = 0x0;
|
|
accelerationBuildOffsetInfo.firstVertex = 0;
|
|
accelerationBuildOffsetInfo.transformOffset = 0x0;
|
|
std::vector<VkAccelerationStructureBuildOffsetInfoKHR*> accelerationBuildOffsets = { &accelerationBuildOffsetInfo };
|
|
|
|
if (rayTracingFeatures.rayTracingHostAccelerationStructureCommands)
|
|
{
|
|
// Implementation supports building acceleration structure building on host
|
|
VK_CHECK_RESULT(vkBuildAccelerationStructureKHR(device, 1, &accelerationBuildGeometryInfo, accelerationBuildOffsets.data()));
|
|
}
|
|
else
|
|
{
|
|
// Acceleration structure needs to be build on the device
|
|
VkCommandBuffer commandBuffer = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
|
|
vkCmdBuildAccelerationStructureKHR(commandBuffer, 1, &accelerationBuildGeometryInfo, accelerationBuildOffsets.data());
|
|
vulkanDevice->flushCommandBuffer(commandBuffer, queue);
|
|
}
|
|
|
|
VkAccelerationStructureDeviceAddressInfoKHR accelerationDeviceAddressInfo{};
|
|
accelerationDeviceAddressInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_DEVICE_ADDRESS_INFO_KHR;
|
|
accelerationDeviceAddressInfo.accelerationStructure = topLevelAS.accelerationStructure;
|
|
|
|
topLevelAS.handle = vkGetAccelerationStructureDeviceAddressKHR(device, &accelerationDeviceAddressInfo);
|
|
|
|
deleteScratchBuffer(scratchBuffer);
|
|
instancesBuffer.destroy();
|
|
}
|
|
|
|
/*
|
|
Create the Shader Binding Table that binds the programs and top-level acceleration structure
|
|
*/
|
|
void createShaderBindingTable() {
|
|
const uint32_t groupCount = static_cast<uint32_t>(shaderGroups.size());
|
|
|
|
const uint32_t sbtSize = rayTracingProperties.shaderGroupBaseAlignment * groupCount;
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_RAY_TRACING_BIT_KHR, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, &shaderBindingTable, sbtSize));
|
|
shaderBindingTable.map();
|
|
|
|
// Write the shader handles to the shader binding table
|
|
std::vector<uint8_t> shaderHandleStorage(sbtSize);
|
|
VK_CHECK_RESULT(vkGetRayTracingShaderGroupHandlesKHR(device, pipeline, 0, groupCount, sbtSize, shaderHandleStorage.data()));
|
|
|
|
auto* data = static_cast<uint8_t*>(shaderBindingTable.mapped);
|
|
// This part is required, as the alignment and handle size may differ
|
|
for (uint32_t i = 0; i < groupCount; i++)
|
|
{
|
|
memcpy(data, shaderHandleStorage.data() + i * rayTracingProperties.shaderGroupHandleSize, rayTracingProperties.shaderGroupHandleSize);
|
|
data += rayTracingProperties.shaderGroupBaseAlignment;
|
|
}
|
|
shaderBindingTable.unmap();
|
|
}
|
|
|
|
/*
|
|
Create the descriptor sets used for the ray tracing dispatch
|
|
*/
|
|
void createDescriptorSets()
|
|
{
|
|
std::vector<VkDescriptorPoolSize> poolSizes = {
|
|
{ VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, 1 },
|
|
{ VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1 },
|
|
{ VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1 }
|
|
};
|
|
VkDescriptorPoolCreateInfo descriptorPoolCreateInfo = vks::initializers::descriptorPoolCreateInfo(poolSizes, 1);
|
|
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolCreateInfo, nullptr, &descriptorPool));
|
|
|
|
VkDescriptorSetAllocateInfo descriptorSetAllocateInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayout, 1);
|
|
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &descriptorSetAllocateInfo, &descriptorSet));
|
|
|
|
VkWriteDescriptorSetAccelerationStructureKHR descriptorAccelerationStructureInfo{};
|
|
descriptorAccelerationStructureInfo.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET_ACCELERATION_STRUCTURE_KHR;
|
|
descriptorAccelerationStructureInfo.accelerationStructureCount = 1;
|
|
descriptorAccelerationStructureInfo.pAccelerationStructures = &topLevelAS.accelerationStructure;
|
|
|
|
VkWriteDescriptorSet accelerationStructureWrite{};
|
|
accelerationStructureWrite.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
|
|
// The specialized acceleration structure descriptor has to be chained
|
|
accelerationStructureWrite.pNext = &descriptorAccelerationStructureInfo;
|
|
accelerationStructureWrite.dstSet = descriptorSet;
|
|
accelerationStructureWrite.dstBinding = 0;
|
|
accelerationStructureWrite.descriptorCount = 1;
|
|
accelerationStructureWrite.descriptorType = VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR;
|
|
|
|
VkDescriptorImageInfo storageImageDescriptor{};
|
|
storageImageDescriptor.imageView = storageImage.view;
|
|
storageImageDescriptor.imageLayout = VK_IMAGE_LAYOUT_GENERAL;
|
|
|
|
VkWriteDescriptorSet resultImageWrite = vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1, &storageImageDescriptor);
|
|
VkWriteDescriptorSet uniformBufferWrite = vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2, &ubo.descriptor);
|
|
|
|
std::vector<VkWriteDescriptorSet> writeDescriptorSets = {
|
|
accelerationStructureWrite,
|
|
resultImageWrite,
|
|
uniformBufferWrite
|
|
};
|
|
vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, VK_NULL_HANDLE);
|
|
}
|
|
|
|
/*
|
|
Create our ray tracing pipeline
|
|
*/
|
|
void createRayTracingPipeline()
|
|
{
|
|
VkDescriptorSetLayoutBinding accelerationStructureLayoutBinding{};
|
|
accelerationStructureLayoutBinding.binding = 0;
|
|
accelerationStructureLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR;
|
|
accelerationStructureLayoutBinding.descriptorCount = 1;
|
|
accelerationStructureLayoutBinding.stageFlags = VK_SHADER_STAGE_RAYGEN_BIT_KHR;
|
|
|
|
VkDescriptorSetLayoutBinding resultImageLayoutBinding{};
|
|
resultImageLayoutBinding.binding = 1;
|
|
resultImageLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE;
|
|
resultImageLayoutBinding.descriptorCount = 1;
|
|
resultImageLayoutBinding.stageFlags = VK_SHADER_STAGE_RAYGEN_BIT_KHR;
|
|
|
|
VkDescriptorSetLayoutBinding uniformBufferBinding{};
|
|
uniformBufferBinding.binding = 2;
|
|
uniformBufferBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
|
|
uniformBufferBinding.descriptorCount = 1;
|
|
uniformBufferBinding.stageFlags = VK_SHADER_STAGE_RAYGEN_BIT_KHR;
|
|
|
|
std::vector<VkDescriptorSetLayoutBinding> bindings({
|
|
accelerationStructureLayoutBinding,
|
|
resultImageLayoutBinding,
|
|
uniformBufferBinding
|
|
});
|
|
|
|
VkDescriptorSetLayoutCreateInfo descriptorSetlayoutCI{};
|
|
descriptorSetlayoutCI.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
|
|
descriptorSetlayoutCI.bindingCount = static_cast<uint32_t>(bindings.size());
|
|
descriptorSetlayoutCI.pBindings = bindings.data();
|
|
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorSetlayoutCI, nullptr, &descriptorSetLayout));
|
|
|
|
VkPipelineLayoutCreateInfo pipelineLayoutCI{};
|
|
pipelineLayoutCI.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
|
|
pipelineLayoutCI.setLayoutCount = 1;
|
|
pipelineLayoutCI.pSetLayouts = &descriptorSetLayout;
|
|
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCI, nullptr, &pipelineLayout));
|
|
|
|
const uint32_t shaderIndexRaygen = 0;
|
|
const uint32_t shaderIndexMiss = 1;
|
|
const uint32_t shaderIndexClosestHit = 2;
|
|
|
|
std::array<VkPipelineShaderStageCreateInfo, 3> shaderStages;
|
|
shaderStages[shaderIndexRaygen] = loadShader(getShadersPath() + "raytracingbasic/raygen.rgen.spv", VK_SHADER_STAGE_RAYGEN_BIT_KHR);
|
|
shaderStages[shaderIndexMiss] = loadShader(getShadersPath() + "raytracingbasic/miss.rmiss.spv", VK_SHADER_STAGE_MISS_BIT_KHR);
|
|
shaderStages[shaderIndexClosestHit] = loadShader(getShadersPath() + "raytracingbasic/closesthit.rchit.spv", VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR);
|
|
|
|
/*
|
|
Setup ray tracing shader groups
|
|
*/
|
|
VkRayTracingShaderGroupCreateInfoKHR raygenGroupCI{};
|
|
raygenGroupCI.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR;
|
|
raygenGroupCI.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_GENERAL_KHR;
|
|
raygenGroupCI.generalShader = shaderIndexRaygen;
|
|
raygenGroupCI.closestHitShader = VK_SHADER_UNUSED_KHR;
|
|
raygenGroupCI.anyHitShader = VK_SHADER_UNUSED_KHR;
|
|
raygenGroupCI.intersectionShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroups.push_back(raygenGroupCI);
|
|
|
|
VkRayTracingShaderGroupCreateInfoKHR missGroupCI{};
|
|
missGroupCI.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR;
|
|
missGroupCI.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_GENERAL_KHR;
|
|
missGroupCI.generalShader = shaderIndexMiss;
|
|
missGroupCI.closestHitShader = VK_SHADER_UNUSED_KHR;
|
|
missGroupCI.anyHitShader = VK_SHADER_UNUSED_KHR;
|
|
missGroupCI.intersectionShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroups.push_back(missGroupCI);
|
|
|
|
VkRayTracingShaderGroupCreateInfoKHR closesHitGroupCI{};
|
|
closesHitGroupCI.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR;
|
|
closesHitGroupCI.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_TRIANGLES_HIT_GROUP_KHR;
|
|
closesHitGroupCI.generalShader = VK_SHADER_UNUSED_KHR;
|
|
closesHitGroupCI.closestHitShader = shaderIndexClosestHit;
|
|
closesHitGroupCI.anyHitShader = VK_SHADER_UNUSED_KHR;
|
|
closesHitGroupCI.intersectionShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroups.push_back(closesHitGroupCI);
|
|
|
|
VkRayTracingPipelineCreateInfoKHR rayTracingPipelineCI{};
|
|
rayTracingPipelineCI.sType = VK_STRUCTURE_TYPE_RAY_TRACING_PIPELINE_CREATE_INFO_KHR;
|
|
rayTracingPipelineCI.stageCount = static_cast<uint32_t>(shaderStages.size());
|
|
rayTracingPipelineCI.pStages = shaderStages.data();
|
|
rayTracingPipelineCI.groupCount = static_cast<uint32_t>(shaderGroups.size());
|
|
rayTracingPipelineCI.pGroups = shaderGroups.data();
|
|
rayTracingPipelineCI.maxRecursionDepth = 1;
|
|
rayTracingPipelineCI.layout = pipelineLayout;
|
|
rayTracingPipelineCI.libraries.sType = VK_STRUCTURE_TYPE_PIPELINE_LIBRARY_CREATE_INFO_KHR;
|
|
VK_CHECK_RESULT(vkCreateRayTracingPipelinesKHR(device, VK_NULL_HANDLE, 1, &rayTracingPipelineCI, nullptr, &pipeline));
|
|
}
|
|
|
|
/*
|
|
Create the uniform buffer used to pass matrices to the ray tracing ray generation shader
|
|
*/
|
|
void createUniformBuffer()
|
|
{
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
|
|
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
|
|
&ubo,
|
|
sizeof(uniformData),
|
|
&uniformData));
|
|
VK_CHECK_RESULT(ubo.map());
|
|
|
|
updateUniformBuffers();
|
|
}
|
|
|
|
/*
|
|
If the window has been resized, we need to recreate the storage image and it's descriptor
|
|
*/
|
|
void handleResize()
|
|
{
|
|
// Delete allocated resources
|
|
vkDestroyImageView(device, storageImage.view, nullptr);
|
|
vkDestroyImage(device, storageImage.image, nullptr);
|
|
vkFreeMemory(device, storageImage.memory, nullptr);
|
|
// Recreate image
|
|
createStorageImage();
|
|
// Update descriptor
|
|
VkDescriptorImageInfo storageImageDescriptor{ VK_NULL_HANDLE, storageImage.view, VK_IMAGE_LAYOUT_GENERAL };
|
|
VkWriteDescriptorSet resultImageWrite = vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1, &storageImageDescriptor);
|
|
vkUpdateDescriptorSets(device, 1, &resultImageWrite, 0, VK_NULL_HANDLE);
|
|
}
|
|
|
|
/*
|
|
Command buffer generation
|
|
*/
|
|
void buildCommandBuffers()
|
|
{
|
|
if (resized)
|
|
{
|
|
handleResize();
|
|
}
|
|
|
|
VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
|
|
|
|
VkImageSubresourceRange subresourceRange = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 };
|
|
|
|
for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
|
|
{
|
|
VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
|
|
|
|
/*
|
|
Dispatch the ray tracing commands
|
|
*/
|
|
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_RAY_TRACING_KHR, pipeline);
|
|
vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_RAY_TRACING_KHR, pipelineLayout, 0, 1, &descriptorSet, 0, 0);
|
|
|
|
|
|
/*
|
|
Setup the buffer regions pointing to the shaders in our shader binding table
|
|
*/
|
|
const VkDeviceSize sbtSize = rayTracingProperties.shaderGroupBaseAlignment * (VkDeviceSize)shaderGroups.size();
|
|
|
|
VkStridedBufferRegionKHR raygenShaderSBTEntry{};
|
|
raygenShaderSBTEntry.buffer = shaderBindingTable.buffer;
|
|
raygenShaderSBTEntry.offset = static_cast<VkDeviceSize>(rayTracingProperties.shaderGroupBaseAlignment * INDEX_RAYGEN_GROUP);
|
|
raygenShaderSBTEntry.stride = rayTracingProperties.shaderGroupBaseAlignment;
|
|
raygenShaderSBTEntry.size = sbtSize;
|
|
|
|
VkStridedBufferRegionKHR missShaderSBTEntry{};
|
|
missShaderSBTEntry.buffer = shaderBindingTable.buffer;
|
|
missShaderSBTEntry.offset = static_cast<VkDeviceSize>(rayTracingProperties.shaderGroupBaseAlignment * INDEX_MISS_GROUP);
|
|
missShaderSBTEntry.stride = rayTracingProperties.shaderGroupBaseAlignment;
|
|
missShaderSBTEntry.size = sbtSize;
|
|
|
|
VkStridedBufferRegionKHR hitShaderSBTEntry{};
|
|
hitShaderSBTEntry.buffer = shaderBindingTable.buffer;
|
|
hitShaderSBTEntry.offset = static_cast<VkDeviceSize>(rayTracingProperties.shaderGroupBaseAlignment * INDEX_CLOSEST_HIT_GROUP);
|
|
hitShaderSBTEntry.stride = rayTracingProperties.shaderGroupBaseAlignment;
|
|
hitShaderSBTEntry.size = sbtSize;
|
|
|
|
VkStridedBufferRegionKHR callableShaderSBTEntry{};
|
|
|
|
/*
|
|
Dispatch the ray tracing commands
|
|
*/
|
|
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_RAY_TRACING_KHR, pipeline);
|
|
vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_RAY_TRACING_KHR, pipelineLayout, 0, 1, &descriptorSet, 0, 0);
|
|
|
|
vkCmdTraceRaysKHR(
|
|
drawCmdBuffers[i],
|
|
&raygenShaderSBTEntry,
|
|
&missShaderSBTEntry,
|
|
&hitShaderSBTEntry,
|
|
&callableShaderSBTEntry,
|
|
width,
|
|
height,
|
|
1);
|
|
|
|
/*
|
|
Copy ray tracing output to swap chain image
|
|
*/
|
|
|
|
// Prepare current swap chain image as transfer destination
|
|
vks::tools::setImageLayout(
|
|
drawCmdBuffers[i],
|
|
swapChain.images[i],
|
|
VK_IMAGE_LAYOUT_UNDEFINED,
|
|
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
|
|
subresourceRange);
|
|
|
|
// Prepare ray tracing output image as transfer source
|
|
vks::tools::setImageLayout(
|
|
drawCmdBuffers[i],
|
|
storageImage.image,
|
|
VK_IMAGE_LAYOUT_GENERAL,
|
|
VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
|
|
subresourceRange);
|
|
|
|
VkImageCopy copyRegion{};
|
|
copyRegion.srcSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
|
|
copyRegion.srcOffset = { 0, 0, 0 };
|
|
copyRegion.dstSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
|
|
copyRegion.dstOffset = { 0, 0, 0 };
|
|
copyRegion.extent = { width, height, 1 };
|
|
vkCmdCopyImage(drawCmdBuffers[i], storageImage.image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, swapChain.images[i], VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, ©Region);
|
|
|
|
// Transition swap chain image back for presentation
|
|
vks::tools::setImageLayout(
|
|
drawCmdBuffers[i],
|
|
swapChain.images[i],
|
|
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
|
|
VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,
|
|
subresourceRange);
|
|
|
|
// Transition ray tracing output image back to general layout
|
|
vks::tools::setImageLayout(
|
|
drawCmdBuffers[i],
|
|
storageImage.image,
|
|
VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
|
|
VK_IMAGE_LAYOUT_GENERAL,
|
|
subresourceRange);
|
|
|
|
VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
|
|
}
|
|
}
|
|
|
|
void updateUniformBuffers()
|
|
{
|
|
uniformData.projInverse = glm::inverse(camera.matrices.perspective);
|
|
uniformData.viewInverse = glm::inverse(camera.matrices.view);
|
|
memcpy(ubo.mapped, &uniformData, sizeof(uniformData));
|
|
}
|
|
|
|
void getEnabledFeatures()
|
|
{
|
|
// Enable features required for ray tracing using feature chaining via pNext
|
|
enabledBufferDeviceAddresFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_BUFFER_DEVICE_ADDRESS_FEATURES;
|
|
enabledBufferDeviceAddresFeatures.bufferDeviceAddress = VK_TRUE;
|
|
|
|
enabledRayTracingFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_FEATURES_KHR;
|
|
enabledRayTracingFeatures.rayTracing = VK_TRUE;
|
|
enabledRayTracingFeatures.pNext = &enabledBufferDeviceAddresFeatures;
|
|
|
|
deviceCreatepNextChain = &enabledRayTracingFeatures;
|
|
}
|
|
|
|
void prepare()
|
|
{
|
|
VulkanExampleBase::prepare();
|
|
|
|
// Query the ray tracing properties of the current implementation, we will need them later on
|
|
rayTracingProperties.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_PROPERTIES_KHR;
|
|
VkPhysicalDeviceProperties2 deviceProps2{};
|
|
deviceProps2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2;
|
|
deviceProps2.pNext = &rayTracingProperties;
|
|
vkGetPhysicalDeviceProperties2(physicalDevice, &deviceProps2);
|
|
|
|
// Query the ray tracing properties of the current implementation, we will need them later on
|
|
rayTracingFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_FEATURES_KHR;
|
|
VkPhysicalDeviceFeatures2 deviceFeatures2{};
|
|
deviceFeatures2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2;
|
|
deviceFeatures2.pNext = &rayTracingFeatures;
|
|
vkGetPhysicalDeviceFeatures2(physicalDevice, &deviceFeatures2);
|
|
|
|
// Get the function pointers required for ray tracing
|
|
vkGetBufferDeviceAddressKHR = reinterpret_cast<PFN_vkGetBufferDeviceAddressKHR>(vkGetDeviceProcAddr(device, "vkGetBufferDeviceAddressKHR"));
|
|
vkBindAccelerationStructureMemoryKHR = reinterpret_cast<PFN_vkBindAccelerationStructureMemoryKHR>(vkGetDeviceProcAddr(device, "vkBindAccelerationStructureMemoryKHR"));
|
|
vkCreateAccelerationStructureKHR = reinterpret_cast<PFN_vkCreateAccelerationStructureKHR>(vkGetDeviceProcAddr(device, "vkCreateAccelerationStructureKHR"));
|
|
vkDestroyAccelerationStructureKHR = reinterpret_cast<PFN_vkDestroyAccelerationStructureKHR>(vkGetDeviceProcAddr(device, "vkDestroyAccelerationStructureKHR"));
|
|
vkGetAccelerationStructureMemoryRequirementsKHR = reinterpret_cast<PFN_vkGetAccelerationStructureMemoryRequirementsKHR>(vkGetDeviceProcAddr(device, "vkGetAccelerationStructureMemoryRequirementsKHR"));
|
|
vkCmdBuildAccelerationStructureKHR = reinterpret_cast<PFN_vkCmdBuildAccelerationStructureKHR>(vkGetDeviceProcAddr(device, "vkCmdBuildAccelerationStructureKHR"));
|
|
vkBuildAccelerationStructureKHR = reinterpret_cast<PFN_vkBuildAccelerationStructureKHR>(vkGetDeviceProcAddr(device, "vkBuildAccelerationStructureKHR"));
|
|
vkGetAccelerationStructureDeviceAddressKHR = reinterpret_cast<PFN_vkGetAccelerationStructureDeviceAddressKHR>(vkGetDeviceProcAddr(device, "vkGetAccelerationStructureDeviceAddressKHR"));
|
|
vkCmdTraceRaysKHR = reinterpret_cast<PFN_vkCmdTraceRaysKHR>(vkGetDeviceProcAddr(device, "vkCmdTraceRaysKHR"));
|
|
vkGetRayTracingShaderGroupHandlesKHR = reinterpret_cast<PFN_vkGetRayTracingShaderGroupHandlesKHR>(vkGetDeviceProcAddr(device, "vkGetRayTracingShaderGroupHandlesKHR"));
|
|
vkCreateRayTracingPipelinesKHR = reinterpret_cast<PFN_vkCreateRayTracingPipelinesKHR>(vkGetDeviceProcAddr(device, "vkCreateRayTracingPipelinesKHR"));
|
|
|
|
// Create the acceleration structures used to render the ray traced scene
|
|
createBottomLevelAccelerationStructure();
|
|
createTopLevelAccelerationStructure();
|
|
|
|
createStorageImage();
|
|
createUniformBuffer();
|
|
createRayTracingPipeline();
|
|
createShaderBindingTable();
|
|
createDescriptorSets();
|
|
buildCommandBuffers();
|
|
prepared = true;
|
|
}
|
|
|
|
void draw()
|
|
{
|
|
VulkanExampleBase::prepareFrame();
|
|
submitInfo.commandBufferCount = 1;
|
|
submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
|
|
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
|
|
VulkanExampleBase::submitFrame();
|
|
}
|
|
|
|
virtual void render()
|
|
{
|
|
if (!prepared)
|
|
return;
|
|
draw();
|
|
if (camera.updated)
|
|
updateUniformBuffers();
|
|
}
|
|
};
|
|
|
|
VULKAN_EXAMPLE_MAIN()
|