270 lines
11 KiB
C++
270 lines
11 KiB
C++
/*
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* Copyright (c) 2014-2021, NVIDIA CORPORATION. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* SPDX-FileCopyrightText: Copyright (c) 2014-2021 NVIDIA CORPORATION
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include "nvvk/appbase_vk.hpp"
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#include "nvvk/debug_util_vk.hpp"
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#include "nvvk/descriptorsets_vk.hpp"
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#include "nvvk/memallocator_dma_vk.hpp"
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#include "nvvk/resourceallocator_vk.hpp"
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// #VKRay
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#include "nvvk/raytraceKHR_vk.hpp"
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//--------------------------------------------------------------------------------------------------
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// Simple rasterizer of OBJ objects
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// - Each OBJ loaded are stored in an `ObjModel` and referenced by a `ObjInstance`
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// - It is possible to have many `ObjInstance` referencing the same `ObjModel`
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// - Rendering is done in an offscreen framebuffer
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// - The image of the framebuffer is displayed in post-process in a full-screen quad
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//
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class HelloVulkan : public nvvk::AppBaseVk
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{
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public:
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void setup(const VkInstance& instance, const VkDevice& device, const VkPhysicalDevice& physicalDevice, uint32_t queueFamily) override;
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void createDescriptorSetLayout();
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void createGraphicsPipeline();
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void loadModel(const std::string& filename, nvmath::mat4f transform = nvmath::mat4f(1));
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void addLantern(nvmath::vec3f pos, nvmath::vec3f color, float brightness, float radius);
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void updateDescriptorSet();
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void createUniformBuffer();
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void createSceneDescriptionBuffer();
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void createTextureImages(const VkCommandBuffer& cmdBuf, const std::vector<std::string>& textures);
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nvmath::mat4 getViewMatrix() { return CameraManip.getMatrix(); }
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static constexpr float nearZ = 0.1f;
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nvmath::mat4 getProjMatrix()
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{
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const float aspectRatio = m_size.width / static_cast<float>(m_size.height);
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return nvmath::perspectiveVK(CameraManip.getFov(), aspectRatio, nearZ, 1000.0f);
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}
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void updateUniformBuffer(const VkCommandBuffer& cmdBuf);
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void onResize(int /*w*/, int /*h*/) override;
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void destroyResources();
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void rasterize(const VkCommandBuffer& cmdBuff);
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// The OBJ model
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struct ObjModel
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{
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uint32_t nbIndices{0};
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uint32_t nbVertices{0};
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nvvk::Buffer vertexBuffer; // Device buffer of all 'Vertex'
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nvvk::Buffer indexBuffer; // Device buffer of the indices forming triangles
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nvvk::Buffer matColorBuffer; // Device buffer of array of 'Wavefront material'
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nvvk::Buffer matIndexBuffer; // Device buffer of array of 'Wavefront material'
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};
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// Instance of the OBJ
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struct ObjInstance
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{
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nvmath::mat4f transform{1}; // Position of the instance
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nvmath::mat4f transformIT{1}; // Inverse transpose
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uint32_t objIndex{0}; // Reference to the `m_objModel`
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uint32_t txtOffset{0}; // Offset in `m_textures`
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VkDeviceAddress vertices;
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VkDeviceAddress indices;
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VkDeviceAddress materials;
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VkDeviceAddress materialIndices;
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};
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// Information pushed at each draw call
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struct ObjPushConstant
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{
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nvmath::vec3f lightPosition{10.f, 15.f, 8.f};
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int instanceId{0}; // To retrieve the transformation matrix
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float lightIntensity{40.f};
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int lightType{0}; // 0: point, 1: infinite
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};
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ObjPushConstant m_pushConstant;
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// Information on each colored lantern illuminating the scene.
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struct Lantern
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{
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nvmath::vec3f position;
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nvmath::vec3f color;
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float brightness;
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float radius; // Max world-space distance that light illuminates.
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};
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// Information on each colored lantern, plus the info needed for dispatching the
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// indirect ray trace command used to add its brightness effect.
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// The dispatched ray trace covers pixels (offsetX, offsetY) to
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// (offsetX + indirectCommand.width - 1, offsetY + indirectCommand.height - 1).
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struct LanternIndirectEntry
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{
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// Filled in by the device using a compute shader.
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// NOTE: I rely on indirectCommand being the first member.
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VkTraceRaysIndirectCommandKHR indirectCommand;
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int32_t offsetX;
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int32_t offsetY;
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// Filled in by the host.
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Lantern lantern;
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};
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// Array of objects and instances in the scene. Not modifiable after acceleration structure build.
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std::vector<ObjModel> m_objModel;
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std::vector<ObjInstance> m_objInstance;
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// Array of lanterns in scene. Not modifiable after acceleration structure build.
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std::vector<Lantern> m_lanterns;
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// Graphic pipeline
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VkPipelineLayout m_pipelineLayout;
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VkPipeline m_graphicsPipeline;
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nvvk::DescriptorSetBindings m_descSetLayoutBind;
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VkDescriptorPool m_descPool;
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VkDescriptorSetLayout m_descSetLayout;
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VkDescriptorSet m_descSet;
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nvvk::Buffer m_cameraMat; // Device-Host of the camera matrices
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nvvk::Buffer m_sceneDesc; // Device buffer of the OBJ instances
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std::vector<nvvk::Texture> m_textures; // vector of all textures of the scene
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nvvk::ResourceAllocatorDma m_alloc; // Allocator for buffer, images, acceleration structures
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nvvk::DebugUtil m_debug; // Utility to name objects
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// #Post
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void createOffscreenRender();
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void createPostPipeline();
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void createPostDescriptor();
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void updatePostDescriptorSet();
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void drawPost(VkCommandBuffer cmdBuf);
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nvvk::DescriptorSetBindings m_postDescSetLayoutBind;
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VkDescriptorPool m_postDescPool{VK_NULL_HANDLE};
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VkDescriptorSetLayout m_postDescSetLayout{VK_NULL_HANDLE};
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VkDescriptorSet m_postDescSet{VK_NULL_HANDLE};
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VkPipeline m_postPipeline{VK_NULL_HANDLE};
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VkPipelineLayout m_postPipelineLayout{VK_NULL_HANDLE};
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VkRenderPass m_offscreenRenderPass{VK_NULL_HANDLE};
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VkFramebuffer m_offscreenFramebuffer{VK_NULL_HANDLE};
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nvvk::Texture m_offscreenColor;
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nvvk::Texture m_offscreenDepth;
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VkFormat m_offscreenColorFormat{VK_FORMAT_R32G32B32A32_SFLOAT};
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VkFormat m_offscreenDepthFormat{VK_FORMAT_X8_D24_UNORM_PACK32};
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// #VKRay
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void initRayTracing();
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auto objectToVkGeometryKHR(const ObjModel& model);
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private:
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void fillLanternVerts(std::vector<nvmath::vec3f>& vertices, std::vector<uint32_t>& indices);
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void createLanternModel();
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public:
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void createBottomLevelAS();
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void createTopLevelAS();
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void createRtDescriptorSet();
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void updateRtDescriptorSet();
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void createRtPipeline();
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void createLanternIndirectDescriptorSet();
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void createLanternIndirectCompPipeline();
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void createRtShaderBindingTable();
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void createLanternIndirectBuffer();
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void raytrace(const VkCommandBuffer& cmdBuf, const nvmath::vec4f& clearColor);
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// Used to store lantern model, generated at runtime.
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const float m_lanternModelRadius = 0.125;
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nvvk::Buffer m_lanternVertexBuffer;
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nvvk::Buffer m_lanternIndexBuffer;
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nvvk::RaytracingBuilderKHR::BlasInput m_lanternBlasInput{};
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// Index of lantern's BLAS in the BLAS array stored in m_rtBuilder.
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size_t m_lanternBlasId;
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VkPhysicalDeviceRayTracingPipelinePropertiesKHR m_rtProperties{VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_PIPELINE_PROPERTIES_KHR};
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nvvk::RaytracingBuilderKHR m_rtBuilder;
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nvvk::DescriptorSetBindings m_rtDescSetLayoutBind;
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VkDescriptorPool m_rtDescPool;
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VkDescriptorSetLayout m_rtDescSetLayout;
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VkDescriptorSet m_rtDescSet;
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std::vector<VkRayTracingShaderGroupCreateInfoKHR> m_rtShaderGroups;
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VkPipelineLayout m_rtPipelineLayout;
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VkPipeline m_rtPipeline;
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nvvk::DescriptorSetBindings m_lanternIndirectDescSetLayoutBind;
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VkDescriptorPool m_lanternIndirectDescPool;
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VkDescriptorSetLayout m_lanternIndirectDescSetLayout;
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VkDescriptorSet m_lanternIndirectDescSet;
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VkPipelineLayout m_lanternIndirectCompPipelineLayout;
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VkPipeline m_lanternIndirectCompPipeline;
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nvvk::Buffer m_rtSBTBuffer;
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// Buffer to source vkCmdTraceRaysIndirectKHR indirect parameters and lantern color,
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// position, etc. from when doing lantern lighting passes.
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nvvk::Buffer m_lanternIndirectBuffer;
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VkDeviceSize m_lanternCount = 0; // Set to actual lantern count after TLAS build, as
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// that is the point no more lanterns may be added.
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// Push constant for ray trace pipeline.
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struct RtPushConstant
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{
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// Background color
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nvmath::vec4f clearColor;
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// Information on the light in the sky used when lanternPassNumber = -1.
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nvmath::vec3f lightPosition;
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float lightIntensity;
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int32_t lightType;
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// -1 if this is the full-screen pass. Otherwise, this pass is to add light
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// from lantern number lanternPassNumber. We use this to lookup trace indirect
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// parameters in m_lanternIndirectBuffer.
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int32_t lanternPassNumber;
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// Pixel dimensions of the output image.
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int32_t screenX;
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int32_t screenY;
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// See m_lanternDebug.
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int32_t lanternDebug;
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} m_rtPushConstants;
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// Copied to RtPushConstant::lanternDebug. If true,
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// make lantern produce constant light regardless of distance
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// so that I can see the screen rectangle coverage.
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bool m_lanternDebug = false;
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// Push constant for compute shader filling lantern indirect buffer.
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// Barely fits in 128-byte push constant limit guaranteed by spec.
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struct LanternIndirectPushConstants
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{
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nvmath::vec4 viewRowX; // First 3 rows of view matrix.
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nvmath::vec4 viewRowY; // Set w=1 implicitly in shader.
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nvmath::vec4 viewRowZ;
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nvmath::mat4 proj; // Perspective matrix
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float nearZ; // Near plane used to create projection matrix.
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// Pixel dimensions of output image (needed to scale NDC to screen coordinates).
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int32_t screenX;
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int32_t screenY;
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// Length of the LanternIndirectEntry array.
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int32_t lanternCount;
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} m_lanternIndirectPushConstants;
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};
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