715 lines
33 KiB
C++
715 lines
33 KiB
C++
/*
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* Vulkan Example - Texture mapping with transparency using accelerated ray tracing example
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*
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* Copyright (C) 2024 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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/*
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* This hardware accelerated ray tracing sample renders a texture mapped quad with transparency
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* The sample also makes use of buffer device addresses to pass references for vertex and index buffers
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* to the shader, making data access a bit more straightforward than using descriptors.
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* Buffer references themselves are then simply set at draw time using push constants.
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* In addition to a closest hit shader, that now samples from the texture, an any hit shader is
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* added to the closest hit shader group. We use this shader to check if the texel we want to
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* sample at the currently hit ray position is transparent, and if that's the case the any hit
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* shader will cancel the intersection.
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*/
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#include "VulkanRaytracingSample.h"
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class VulkanExample : public VulkanRaytracingSample
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{
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public:
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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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vks::Buffer transformBuffer;
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std::vector<VkRayTracingShaderGroupCreateInfoKHR> shaderGroups{};
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struct ShaderBindingTables {
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ShaderBindingTable raygen;
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ShaderBindingTable miss;
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ShaderBindingTable hit;
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} shaderBindingTables;
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vks::Texture2D texture;
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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() : VulkanRaytracingSample()
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{
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title = "Ray tracing textures";
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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(45.0f, 0.0f, 0.0f));
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camera.setTranslation(glm::vec3(0.0f, 0.0f, -1.0f));
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enableExtensions();
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// Buffer device address requires the 64-bit integer feature to be enabled
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enabledFeatures.shaderInt64 = VK_TRUE;
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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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deleteStorageImage();
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deleteAccelerationStructure(bottomLevelAS);
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deleteAccelerationStructure(topLevelAS);
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vertexBuffer.destroy();
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indexBuffer.destroy();
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transformBuffer.destroy();
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shaderBindingTables.raygen.destroy();
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shaderBindingTables.miss.destroy();
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shaderBindingTables.hit.destroy();
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ubo.destroy();
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texture.destroy();
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}
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void createAccelerationStructureBuffer(AccelerationStructure &accelerationStructure, VkAccelerationStructureBuildSizesInfoKHR buildSizeInfo)
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{
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VkBufferCreateInfo bufferCreateInfo{};
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bufferCreateInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
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bufferCreateInfo.size = buildSizeInfo.accelerationStructureSize;
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bufferCreateInfo.usage = VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT;
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VK_CHECK_RESULT(vkCreateBuffer(device, &bufferCreateInfo, nullptr, &accelerationStructure.buffer));
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VkMemoryRequirements memoryRequirements{};
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vkGetBufferMemoryRequirements(device, accelerationStructure.buffer, &memoryRequirements);
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VkMemoryAllocateFlagsInfo memoryAllocateFlagsInfo{};
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memoryAllocateFlagsInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_FLAGS_INFO;
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memoryAllocateFlagsInfo.flags = VK_MEMORY_ALLOCATE_DEVICE_ADDRESS_BIT_KHR;
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VkMemoryAllocateInfo memoryAllocateInfo{};
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memoryAllocateInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
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memoryAllocateInfo.pNext = &memoryAllocateFlagsInfo;
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memoryAllocateInfo.allocationSize = memoryRequirements.size;
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memoryAllocateInfo.memoryTypeIndex = vulkanDevice->getMemoryType(memoryRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
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VK_CHECK_RESULT(vkAllocateMemory(device, &memoryAllocateInfo, nullptr, &accelerationStructure.memory));
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VK_CHECK_RESULT(vkBindBufferMemory(device, accelerationStructure.buffer, accelerationStructure.memory, 0));
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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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float normal[3];
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float uv[2];
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};
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std::vector<Vertex> vertices = {
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{ { 0.5f, 0.5f, 0.0f }, {.0f, .0f, -1.0f}, { 1.0f, 1.0f} },
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{ { -.5f, 0.5f, 0.0f }, {.0f, .0f, -1.0f}, { 0.0f, 1.0f} },
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{ { -.5f, -.5f, 0.0f }, {.0f, .0f, -1.0f}, { 0.0f, 0.0f} },
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{ { 0.5f, -.5f, 0.0f }, {.0f, .0f, -1.0f}, { 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, 0, 3, 2 };
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indexCount = static_cast<uint32_t>(indices.size());
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// Setup identity transform matrix
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VkTransformMatrixKHR transformMatrix = {
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1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f, 0.0f
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};
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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_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR | VK_BUFFER_USAGE_STORAGE_BUFFER_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_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR | VK_BUFFER_USAGE_STORAGE_BUFFER_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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// Transform buffer
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VK_CHECK_RESULT(vulkanDevice->createBuffer(
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VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR,
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VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
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&transformBuffer,
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sizeof(VkTransformMatrixKHR),
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&transformMatrix));
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VkDeviceOrHostAddressConstKHR vertexBufferDeviceAddress{};
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VkDeviceOrHostAddressConstKHR indexBufferDeviceAddress{};
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VkDeviceOrHostAddressConstKHR transformBufferDeviceAddress{};
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vertexBufferDeviceAddress.deviceAddress = getBufferDeviceAddress(vertexBuffer.buffer);
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indexBufferDeviceAddress.deviceAddress = getBufferDeviceAddress(indexBuffer.buffer);
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transformBufferDeviceAddress.deviceAddress = getBufferDeviceAddress(transformBuffer.buffer);
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// Build
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VkAccelerationStructureGeometryKHR accelerationStructureGeometry{};
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accelerationStructureGeometry.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_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 = vertexBufferDeviceAddress;
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accelerationStructureGeometry.geometry.triangles.maxVertex = 3;
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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 = indexBufferDeviceAddress;
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accelerationStructureGeometry.geometry.triangles.transformData.deviceAddress = 0;
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accelerationStructureGeometry.geometry.triangles.transformData.hostAddress = nullptr;
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accelerationStructureGeometry.geometry.triangles.transformData = transformBufferDeviceAddress;
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// Get size info
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VkAccelerationStructureBuildGeometryInfoKHR accelerationStructureBuildGeometryInfo{};
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accelerationStructureBuildGeometryInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR;
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accelerationStructureBuildGeometryInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
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accelerationStructureBuildGeometryInfo.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
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accelerationStructureBuildGeometryInfo.geometryCount = 1;
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accelerationStructureBuildGeometryInfo.pGeometries = &accelerationStructureGeometry;
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const uint32_t numTriangles = static_cast<uint32_t>(indices.size() / 3);
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VkAccelerationStructureBuildSizesInfoKHR accelerationStructureBuildSizesInfo{};
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accelerationStructureBuildSizesInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR;
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vkGetAccelerationStructureBuildSizesKHR(
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device,
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VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR,
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&accelerationStructureBuildGeometryInfo,
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&numTriangles,
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&accelerationStructureBuildSizesInfo);
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createAccelerationStructureBuffer(bottomLevelAS, accelerationStructureBuildSizesInfo);
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VkAccelerationStructureCreateInfoKHR accelerationStructureCreateInfo{};
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accelerationStructureCreateInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR;
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accelerationStructureCreateInfo.buffer = bottomLevelAS.buffer;
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accelerationStructureCreateInfo.size = accelerationStructureBuildSizesInfo.accelerationStructureSize;
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accelerationStructureCreateInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
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vkCreateAccelerationStructureKHR(device, &accelerationStructureCreateInfo, nullptr, &bottomLevelAS.handle);
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// Create a small scratch buffer used during build of the bottom level acceleration structure
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ScratchBuffer scratchBuffer = createScratchBuffer(accelerationStructureBuildSizesInfo.buildScratchSize);
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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.mode = VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR;
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accelerationBuildGeometryInfo.dstAccelerationStructure = bottomLevelAS.handle;
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accelerationBuildGeometryInfo.geometryCount = 1;
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accelerationBuildGeometryInfo.pGeometries = &accelerationStructureGeometry;
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accelerationBuildGeometryInfo.scratchData.deviceAddress = scratchBuffer.deviceAddress;
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VkAccelerationStructureBuildRangeInfoKHR accelerationStructureBuildRangeInfo{};
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accelerationStructureBuildRangeInfo.primitiveCount = numTriangles;
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accelerationStructureBuildRangeInfo.primitiveOffset = 0;
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accelerationStructureBuildRangeInfo.firstVertex = 0;
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accelerationStructureBuildRangeInfo.transformOffset = 0;
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std::vector<VkAccelerationStructureBuildRangeInfoKHR*> accelerationBuildStructureRangeInfos = { &accelerationStructureBuildRangeInfo };
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// Build the acceleration structure on the device via a one-time command buffer submission
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// Some implementations may support acceleration structure building on the host (VkPhysicalDeviceAccelerationStructureFeaturesKHR->accelerationStructureHostCommands), but we prefer device builds
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VkCommandBuffer commandBuffer = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
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vkCmdBuildAccelerationStructuresKHR(
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commandBuffer,
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1,
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&accelerationBuildGeometryInfo,
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accelerationBuildStructureRangeInfos.data());
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vulkanDevice->flushCommandBuffer(commandBuffer, queue);
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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.handle;
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bottomLevelAS.deviceAddress = vkGetAccelerationStructureDeviceAddressKHR(device, &accelerationDeviceAddressInfo);
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deleteScratchBuffer(scratchBuffer);
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}
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/*
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The top level acceleration structure contains the scene's object instances
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*/
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void createTopLevelAccelerationStructure()
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{
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VkTransformMatrixKHR transformMatrix = {
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1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f, 0.0f };
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VkAccelerationStructureInstanceKHR instance{};
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instance.transform = transformMatrix;
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instance.instanceCustomIndex = 0;
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instance.mask = 0xFF;
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instance.instanceShaderBindingTableRecordOffset = 0;
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instance.flags = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR;
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instance.accelerationStructureReference = bottomLevelAS.deviceAddress;
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// Buffer for instance data
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vks::Buffer instancesBuffer;
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VK_CHECK_RESULT(vulkanDevice->createBuffer(
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VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR,
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VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
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&instancesBuffer,
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sizeof(VkAccelerationStructureInstanceKHR),
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&instance));
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VkDeviceOrHostAddressConstKHR instanceDataDeviceAddress{};
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instanceDataDeviceAddress.deviceAddress = getBufferDeviceAddress(instancesBuffer.buffer);
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VkAccelerationStructureGeometryKHR accelerationStructureGeometry{};
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accelerationStructureGeometry.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR;
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accelerationStructureGeometry.geometryType = VK_GEOMETRY_TYPE_INSTANCES_KHR;
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accelerationStructureGeometry.flags = VK_GEOMETRY_OPAQUE_BIT_KHR;
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accelerationStructureGeometry.geometry.instances.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_INSTANCES_DATA_KHR;
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accelerationStructureGeometry.geometry.instances.arrayOfPointers = VK_FALSE;
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accelerationStructureGeometry.geometry.instances.data = instanceDataDeviceAddress;
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// Get size info
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/*
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The pSrcAccelerationStructure, dstAccelerationStructure, and mode members of pBuildInfo are ignored. Any VkDeviceOrHostAddressKHR members of pBuildInfo are ignored by this command, except that the hostAddress member of VkAccelerationStructureGeometryTrianglesDataKHR::transformData will be examined to check if it is NULL.*
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*/
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VkAccelerationStructureBuildGeometryInfoKHR accelerationStructureBuildGeometryInfo{};
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accelerationStructureBuildGeometryInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR;
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accelerationStructureBuildGeometryInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR;
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accelerationStructureBuildGeometryInfo.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
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accelerationStructureBuildGeometryInfo.geometryCount = 1;
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accelerationStructureBuildGeometryInfo.pGeometries = &accelerationStructureGeometry;
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uint32_t primitive_count = 1;
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VkAccelerationStructureBuildSizesInfoKHR accelerationStructureBuildSizesInfo{};
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accelerationStructureBuildSizesInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR;
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vkGetAccelerationStructureBuildSizesKHR(
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device,
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VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR,
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&accelerationStructureBuildGeometryInfo,
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&primitive_count,
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&accelerationStructureBuildSizesInfo);
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createAccelerationStructureBuffer(topLevelAS, accelerationStructureBuildSizesInfo);
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VkAccelerationStructureCreateInfoKHR accelerationStructureCreateInfo{};
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accelerationStructureCreateInfo.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR;
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accelerationStructureCreateInfo.buffer = topLevelAS.buffer;
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accelerationStructureCreateInfo.size = accelerationStructureBuildSizesInfo.accelerationStructureSize;
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accelerationStructureCreateInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR;
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vkCreateAccelerationStructureKHR(device, &accelerationStructureCreateInfo, nullptr, &topLevelAS.handle);
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// Create a small scratch buffer used during build of the top level acceleration structure
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ScratchBuffer scratchBuffer = createScratchBuffer(accelerationStructureBuildSizesInfo.buildScratchSize);
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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_TOP_LEVEL_KHR;
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accelerationBuildGeometryInfo.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
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accelerationBuildGeometryInfo.mode = VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR;
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accelerationBuildGeometryInfo.dstAccelerationStructure = topLevelAS.handle;
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accelerationBuildGeometryInfo.geometryCount = 1;
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accelerationBuildGeometryInfo.pGeometries = &accelerationStructureGeometry;
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accelerationBuildGeometryInfo.scratchData.deviceAddress = scratchBuffer.deviceAddress;
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VkAccelerationStructureBuildRangeInfoKHR accelerationStructureBuildRangeInfo{};
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accelerationStructureBuildRangeInfo.primitiveCount = 1;
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accelerationStructureBuildRangeInfo.primitiveOffset = 0;
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accelerationStructureBuildRangeInfo.firstVertex = 0;
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accelerationStructureBuildRangeInfo.transformOffset = 0;
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std::vector<VkAccelerationStructureBuildRangeInfoKHR*> accelerationBuildStructureRangeInfos = { &accelerationStructureBuildRangeInfo };
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// Build the acceleration structure on the device via a one-time command buffer submission
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// Some implementations may support acceleration structure building on the host (VkPhysicalDeviceAccelerationStructureFeaturesKHR->accelerationStructureHostCommands), but we prefer device builds
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VkCommandBuffer commandBuffer = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
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vkCmdBuildAccelerationStructuresKHR(
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commandBuffer,
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1,
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&accelerationBuildGeometryInfo,
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accelerationBuildStructureRangeInfos.data());
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vulkanDevice->flushCommandBuffer(commandBuffer, queue);
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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 = topLevelAS.handle;
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topLevelAS.deviceAddress = vkGetAccelerationStructureDeviceAddressKHR(device, &accelerationDeviceAddressInfo);
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deleteScratchBuffer(scratchBuffer);
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instancesBuffer.destroy();
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}
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/*
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Create the Shader Binding Tables that binds the programs and top-level acceleration structure
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SBT Layout used in this sample:
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/-----------\
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| raygen |
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|-----------|
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| miss |
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|-----------|
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| hit |
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\-----------/
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*/
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void createShaderBindingTables() {
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const uint32_t handleSize = rayTracingPipelineProperties.shaderGroupHandleSize;
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const uint32_t handleSizeAligned = vks::tools::alignedSize(rayTracingPipelineProperties.shaderGroupHandleSize, rayTracingPipelineProperties.shaderGroupHandleAlignment);
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const uint32_t groupCount = static_cast<uint32_t>(shaderGroups.size());
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const uint32_t sbtSize = groupCount * handleSizeAligned;
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std::vector<uint8_t> shaderHandleStorage(sbtSize);
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VK_CHECK_RESULT(vkGetRayTracingShaderGroupHandlesKHR(device, pipeline, 0, groupCount, sbtSize, shaderHandleStorage.data()));
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createShaderBindingTable(shaderBindingTables.raygen, 1);
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createShaderBindingTable(shaderBindingTables.miss, 1);
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createShaderBindingTable(shaderBindingTables.hit, 1);
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// Copy handles
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memcpy(shaderBindingTables.raygen.mapped, shaderHandleStorage.data(), handleSize);
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memcpy(shaderBindingTables.miss.mapped, shaderHandleStorage.data() + handleSizeAligned, handleSize);
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memcpy(shaderBindingTables.hit.mapped, shaderHandleStorage.data() + handleSizeAligned * 2, handleSize);
|
|
}
|
|
|
|
/*
|
|
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 },
|
|
{ VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 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 = vks::initializers::writeDescriptorSetAccelerationStructureKHR();
|
|
descriptorAccelerationStructureInfo.accelerationStructureCount = 1;
|
|
descriptorAccelerationStructureInfo.pAccelerationStructures = &topLevelAS.handle;
|
|
|
|
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{ VK_NULL_HANDLE, storageImage.view, VK_IMAGE_LAYOUT_GENERAL };
|
|
|
|
std::vector<VkWriteDescriptorSet> writeDescriptorSets = {
|
|
// Binding 0: Top level acceleration structure
|
|
accelerationStructureWrite,
|
|
// Binding 1: Ray tracing result image
|
|
vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1, &storageImageDescriptor),
|
|
// Binding 2: Uniform data
|
|
vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2, &ubo.descriptor),
|
|
// Binding 3: Texture image
|
|
vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 3, &texture.descriptor),
|
|
};
|
|
vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, VK_NULL_HANDLE);
|
|
}
|
|
|
|
/*
|
|
Create our ray tracing pipeline
|
|
*/
|
|
void createRayTracingPipeline()
|
|
{
|
|
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
|
|
// Binding 0: Top level acceleration structure
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, VK_SHADER_STAGE_RAYGEN_BIT_KHR | VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR, 0),
|
|
// Binding 1: Ray tracing result image
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, VK_SHADER_STAGE_RAYGEN_BIT_KHR, 1),
|
|
// Binding 2: Uniform buffer
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_RAYGEN_BIT_KHR | VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR | VK_SHADER_STAGE_MISS_BIT_KHR, 2),
|
|
// Binding 3: Texture image
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR | VK_SHADER_STAGE_ANY_HIT_BIT_KHR, 3)
|
|
};
|
|
|
|
VkDescriptorSetLayoutCreateInfo descriptorSetLayoutCI = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings);
|
|
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorSetLayoutCI, nullptr, &descriptorSetLayout));
|
|
|
|
// We pass buffer references for vertex and index buffers via push constants
|
|
VkPushConstantRange pushConstantRange{};
|
|
pushConstantRange.stageFlags = VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR | VK_SHADER_STAGE_ANY_HIT_BIT_KHR;
|
|
pushConstantRange.offset = 0;
|
|
pushConstantRange.size = sizeof(uint64_t) * 2;
|
|
|
|
VkPipelineLayoutCreateInfo pipelineLayoutCI = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayout, 1);
|
|
pipelineLayoutCI.pPushConstantRanges = &pushConstantRange;
|
|
pipelineLayoutCI.pushConstantRangeCount = 1;
|
|
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCI, nullptr, &pipelineLayout));
|
|
|
|
/*
|
|
Setup ray tracing shader groups
|
|
*/
|
|
std::vector<VkPipelineShaderStageCreateInfo> shaderStages;
|
|
|
|
// Ray generation group
|
|
{
|
|
shaderStages.push_back(loadShader(getShadersPath() + "raytracingtextures/raygen.rgen.spv", VK_SHADER_STAGE_RAYGEN_BIT_KHR));
|
|
VkRayTracingShaderGroupCreateInfoKHR shaderGroup{};
|
|
shaderGroup.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR;
|
|
shaderGroup.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_GENERAL_KHR;
|
|
shaderGroup.generalShader = static_cast<uint32_t>(shaderStages.size()) - 1;
|
|
shaderGroup.closestHitShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroup.anyHitShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroup.intersectionShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroups.push_back(shaderGroup);
|
|
}
|
|
|
|
// Miss group
|
|
{
|
|
shaderStages.push_back(loadShader(getShadersPath() + "raytracingtextures/miss.rmiss.spv", VK_SHADER_STAGE_MISS_BIT_KHR));
|
|
VkRayTracingShaderGroupCreateInfoKHR shaderGroup{};
|
|
shaderGroup.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR;
|
|
shaderGroup.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_GENERAL_KHR;
|
|
shaderGroup.generalShader = static_cast<uint32_t>(shaderStages.size()) - 1;
|
|
shaderGroup.closestHitShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroup.anyHitShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroup.intersectionShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroups.push_back(shaderGroup);
|
|
}
|
|
|
|
// Closest hit group for doing texture lookups
|
|
{
|
|
shaderStages.push_back(loadShader(getShadersPath() + "raytracingtextures/closesthit.rchit.spv", VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR));
|
|
VkRayTracingShaderGroupCreateInfoKHR shaderGroup{};
|
|
shaderGroup.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR;
|
|
shaderGroup.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_TRIANGLES_HIT_GROUP_KHR;
|
|
shaderGroup.generalShader = VK_SHADER_UNUSED_KHR;
|
|
shaderGroup.closestHitShader = static_cast<uint32_t>(shaderStages.size()) - 1;
|
|
shaderGroup.intersectionShader = VK_SHADER_UNUSED_KHR;
|
|
// This group also uses an anyhit shader for doing transparency (see anyhit.rahit for details)
|
|
shaderStages.push_back(loadShader(getShadersPath() + "raytracingtextures/anyhit.rahit.spv", VK_SHADER_STAGE_ANY_HIT_BIT_KHR));
|
|
shaderGroup.anyHitShader = static_cast<uint32_t>(shaderStages.size()) - 1;
|
|
shaderGroups.push_back(shaderGroup);
|
|
}
|
|
|
|
/*
|
|
Create the ray tracing pipeline
|
|
*/
|
|
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.maxPipelineRayRecursionDepth = 1;
|
|
rayTracingPipelineCI.layout = pipelineLayout;
|
|
VK_CHECK_RESULT(vkCreateRayTracingPipelinesKHR(device, VK_NULL_HANDLE, 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()
|
|
{
|
|
// Recreate image
|
|
createStorageImage(swapChain.colorFormat, { width, height, 1 });
|
|
// 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);
|
|
resized = false;
|
|
}
|
|
|
|
/*
|
|
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);
|
|
|
|
struct BufferReferences {
|
|
uint64_t vertices;
|
|
uint64_t indices;
|
|
} bufferReferences;
|
|
|
|
bufferReferences.vertices = getBufferDeviceAddress(vertexBuffer.buffer);
|
|
bufferReferences.indices = getBufferDeviceAddress(indexBuffer.buffer);
|
|
|
|
// We set the buffer references for the mesh to be rendered using a push constant
|
|
// If we wanted to render multiple objecets this would make it very easy to access their vertex and index buffers
|
|
vkCmdPushConstants(drawCmdBuffers[i], pipelineLayout, VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR | VK_SHADER_STAGE_ANY_HIT_BIT_KHR, 0, sizeof(uint64_t) * 2, &bufferReferences);
|
|
|
|
VkStridedDeviceAddressRegionKHR emptySbtEntry = {};
|
|
vkCmdTraceRaysKHR(
|
|
drawCmdBuffers[i],
|
|
&shaderBindingTables.raygen.stridedDeviceAddressRegion,
|
|
&shaderBindingTables.miss.stridedDeviceAddressRegion,
|
|
&shaderBindingTables.hit.stridedDeviceAddressRegion,
|
|
&emptySbtEntry,
|
|
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);
|
|
|
|
drawUI(drawCmdBuffers[i], frameBuffers[i]);
|
|
|
|
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;
|
|
|
|
enabledRayTracingPipelineFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_PIPELINE_FEATURES_KHR;
|
|
enabledRayTracingPipelineFeatures.rayTracingPipeline = VK_TRUE;
|
|
enabledRayTracingPipelineFeatures.pNext = &enabledBufferDeviceAddresFeatures;
|
|
|
|
enabledAccelerationStructureFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_ACCELERATION_STRUCTURE_FEATURES_KHR;
|
|
enabledAccelerationStructureFeatures.accelerationStructure = VK_TRUE;
|
|
enabledAccelerationStructureFeatures.pNext = &enabledRayTracingPipelineFeatures;
|
|
|
|
deviceCreatepNextChain = &enabledAccelerationStructureFeatures;
|
|
}
|
|
|
|
void loadAssets()
|
|
{
|
|
texture.loadFromFile(getAssetPath() + "textures/gratefloor_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
|
|
}
|
|
|
|
void prepare()
|
|
{
|
|
VulkanRaytracingSample::prepare();
|
|
|
|
loadAssets();
|
|
|
|
// Create the acceleration structures used to render the ray traced scene
|
|
createBottomLevelAccelerationStructure();
|
|
createTopLevelAccelerationStructure();
|
|
|
|
createStorageImage(swapChain.colorFormat, { width, height, 1 });
|
|
createUniformBuffer();
|
|
createRayTracingPipeline();
|
|
createShaderBindingTables();
|
|
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()
|