919 lines
No EOL
33 KiB
C++
919 lines
No EOL
33 KiB
C++
/*
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* Vulkan Example - Compute shader N-body simulation using two passes and shared compute shader memory
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*
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* Copyright (C) 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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <vector>
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#include <random>
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#define GLM_FORCE_RADIANS
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#define GLM_FORCE_DEPTH_ZERO_TO_ONE
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <vulkan/vulkan.h>
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#include "vulkanexamplebase.h"
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#include "VulkanTexture.hpp"
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#define VERTEX_BUFFER_BIND_ID 0
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#define ENABLE_VALIDATION false
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#if defined(__ANDROID__)
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// Lower particle count on Android for performance reasons
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#define PARTICLES_PER_ATTRACTOR 3 * 1024
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#else
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#define PARTICLES_PER_ATTRACTOR 4 * 1024
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#endif
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class VulkanExample : public VulkanExampleBase
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{
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public:
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uint32_t numParticles;
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struct {
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vks::Texture2D particle;
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vks::Texture2D gradient;
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} textures;
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struct {
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VkPipelineVertexInputStateCreateInfo inputState;
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std::vector<VkVertexInputBindingDescription> bindingDescriptions;
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std::vector<VkVertexInputAttributeDescription> attributeDescriptions;
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} vertices;
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// Resources for the graphics part of the example
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struct {
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uint32_t queueFamilyIndex; // Used to check if compute and graphics queue families differ and require additional barriers
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vks::Buffer uniformBuffer; // Contains scene matrices
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VkDescriptorSetLayout descriptorSetLayout; // Particle system rendering shader binding layout
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VkDescriptorSet descriptorSet; // Particle system rendering shader bindings
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VkPipelineLayout pipelineLayout; // Layout of the graphics pipeline
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VkPipeline pipeline; // Particle rendering pipeline
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VkSemaphore semaphore; // Execution dependency between compute & graphic submission
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struct {
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glm::mat4 projection;
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glm::mat4 view;
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glm::vec2 screenDim;
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} ubo;
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} graphics;
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// Resources for the compute part of the example
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struct {
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uint32_t queueFamilyIndex; // Used to check if compute and graphics queue families differ and require additional barriers
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vks::Buffer storageBuffer; // (Shader) storage buffer object containing the particles
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vks::Buffer uniformBuffer; // Uniform buffer object containing particle system parameters
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VkQueue queue; // Separate queue for compute commands (queue family may differ from the one used for graphics)
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VkCommandPool commandPool; // Use a separate command pool (queue family may differ from the one used for graphics)
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VkCommandBuffer commandBuffer; // Command buffer storing the dispatch commands and barriers
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VkSemaphore semaphore; // Execution dependency between compute & graphic submission
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VkDescriptorSetLayout descriptorSetLayout; // Compute shader binding layout
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VkDescriptorSet descriptorSet; // Compute shader bindings
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VkPipelineLayout pipelineLayout; // Layout of the compute pipeline
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VkPipeline pipelineCalculate; // Compute pipeline for N-Body velocity calculation (1st pass)
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VkPipeline pipelineIntegrate; // Compute pipeline for euler integration (2nd pass)
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VkPipeline blur;
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VkPipelineLayout pipelineLayoutBlur;
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VkDescriptorSetLayout descriptorSetLayoutBlur;
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VkDescriptorSet descriptorSetBlur;
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struct computeUBO { // Compute shader uniform block object
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float deltaT; // Frame delta time
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int32_t particleCount;
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} ubo;
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} compute;
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// SSBO particle declaration
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struct Particle {
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glm::vec4 pos; // xyz = position, w = mass
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glm::vec4 vel; // xyz = velocity, w = gradient texture position
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};
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VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
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{
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title = "Compute shader N-body system";
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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(-26.0f, 75.0f, 0.0f));
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camera.setTranslation(glm::vec3(0.0f, 0.0f, -14.0f));
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camera.movementSpeed = 2.5f;
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}
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~VulkanExample()
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{
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// Graphics
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graphics.uniformBuffer.destroy();
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vkDestroyPipeline(device, graphics.pipeline, nullptr);
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vkDestroyPipelineLayout(device, graphics.pipelineLayout, nullptr);
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vkDestroyDescriptorSetLayout(device, graphics.descriptorSetLayout, nullptr);
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vkDestroySemaphore(device, graphics.semaphore, nullptr);
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// Compute
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compute.storageBuffer.destroy();
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compute.uniformBuffer.destroy();
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vkDestroyPipelineLayout(device, compute.pipelineLayout, nullptr);
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vkDestroyDescriptorSetLayout(device, compute.descriptorSetLayout, nullptr);
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vkDestroyPipeline(device, compute.pipelineCalculate, nullptr);
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vkDestroyPipeline(device, compute.pipelineIntegrate, nullptr);
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vkDestroySemaphore(device, compute.semaphore, nullptr);
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vkDestroyCommandPool(device, compute.commandPool, nullptr);
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textures.particle.destroy();
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textures.gradient.destroy();
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}
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void loadAssets()
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{
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textures.particle.loadFromFile(getAssetPath() + "textures/particle01_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
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textures.gradient.loadFromFile(getAssetPath() + "textures/particle_gradient_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
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}
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void buildCommandBuffers()
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{
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VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
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VkClearValue clearValues[2];
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clearValues[0].color = { {0.0f, 0.0f, 0.0f, 1.0f} };
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clearValues[1].depthStencil = { 1.0f, 0 };
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VkRenderPassBeginInfo renderPassBeginInfo = vks::initializers::renderPassBeginInfo();
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renderPassBeginInfo.renderPass = renderPass;
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renderPassBeginInfo.renderArea.offset.x = 0;
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renderPassBeginInfo.renderArea.offset.y = 0;
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renderPassBeginInfo.renderArea.extent.width = width;
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renderPassBeginInfo.renderArea.extent.height = height;
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renderPassBeginInfo.clearValueCount = 2;
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renderPassBeginInfo.pClearValues = clearValues;
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for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
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{
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// Set target frame buffer
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renderPassBeginInfo.framebuffer = frameBuffers[i];
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VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
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// Acquire barrier
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if (graphics.queueFamilyIndex != compute.queueFamilyIndex)
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{
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VkBufferMemoryBarrier buffer_barrier =
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{
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VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
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nullptr,
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0,
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VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
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compute.queueFamilyIndex,
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graphics.queueFamilyIndex,
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compute.storageBuffer.buffer,
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0,
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compute.storageBuffer.size
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};
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vkCmdPipelineBarrier(
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drawCmdBuffers[i],
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
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0,
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0, nullptr,
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1, &buffer_barrier,
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0, nullptr);
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}
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// Draw the particle system using the update vertex buffer
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vkCmdBeginRenderPass(drawCmdBuffers[i], &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
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VkViewport viewport = vks::initializers::viewport((float)width, (float)height, 0.0f, 1.0f);
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vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
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VkRect2D scissor = vks::initializers::rect2D(width, height, 0, 0);
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vkCmdSetScissor(drawCmdBuffers[i], 0, 1, &scissor);
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, graphics.pipeline);
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vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, graphics.pipelineLayout, 0, 1, &graphics.descriptorSet, 0, nullptr);
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VkDeviceSize offsets[1] = { 0 };
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vkCmdBindVertexBuffers(drawCmdBuffers[i], VERTEX_BUFFER_BIND_ID, 1, &compute.storageBuffer.buffer, offsets);
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vkCmdDraw(drawCmdBuffers[i], numParticles, 1, 0, 0);
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drawUI(drawCmdBuffers[i]);
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vkCmdEndRenderPass(drawCmdBuffers[i]);
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// Release barrier
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if (graphics.queueFamilyIndex != compute.queueFamilyIndex)
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{
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VkBufferMemoryBarrier buffer_barrier =
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{
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VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
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nullptr,
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VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
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0,
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graphics.queueFamilyIndex,
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compute.queueFamilyIndex,
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compute.storageBuffer.buffer,
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0,
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compute.storageBuffer.size
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};
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vkCmdPipelineBarrier(
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drawCmdBuffers[i],
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VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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0,
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0, nullptr,
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1, &buffer_barrier,
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0, nullptr);
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}
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VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
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}
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}
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void buildComputeCommandBuffer()
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{
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VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
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VK_CHECK_RESULT(vkBeginCommandBuffer(compute.commandBuffer, &cmdBufInfo));
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// Acquire barrier
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if (graphics.queueFamilyIndex != compute.queueFamilyIndex)
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{
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VkBufferMemoryBarrier buffer_barrier =
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{
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VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
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nullptr,
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0,
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VK_ACCESS_SHADER_WRITE_BIT,
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graphics.queueFamilyIndex,
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compute.queueFamilyIndex,
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compute.storageBuffer.buffer,
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0,
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compute.storageBuffer.size
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};
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vkCmdPipelineBarrier(
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compute.commandBuffer,
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VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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0,
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0, nullptr,
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1, &buffer_barrier,
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0, nullptr);
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}
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// First pass: Calculate particle movement
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// -------------------------------------------------------------------------------------------------------
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vkCmdBindPipeline(compute.commandBuffer, VK_PIPELINE_BIND_POINT_COMPUTE, compute.pipelineCalculate);
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vkCmdBindDescriptorSets(compute.commandBuffer, VK_PIPELINE_BIND_POINT_COMPUTE, compute.pipelineLayout, 0, 1, &compute.descriptorSet, 0, 0);
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vkCmdDispatch(compute.commandBuffer, numParticles / 256, 1, 1);
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// Add memory barrier to ensure that the computer shader has finished writing to the buffer
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VkBufferMemoryBarrier bufferBarrier = vks::initializers::bufferMemoryBarrier();
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bufferBarrier.buffer = compute.storageBuffer.buffer;
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bufferBarrier.size = compute.storageBuffer.descriptor.range;
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bufferBarrier.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT;
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bufferBarrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
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// Transfer ownership if compute and graphics queue familiy indices differ
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bufferBarrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
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bufferBarrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
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vkCmdPipelineBarrier(
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compute.commandBuffer,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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VK_FLAGS_NONE,
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0, nullptr,
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1, &bufferBarrier,
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0, nullptr);
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// Second pass: Integrate particles
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// -------------------------------------------------------------------------------------------------------
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vkCmdBindPipeline(compute.commandBuffer, VK_PIPELINE_BIND_POINT_COMPUTE, compute.pipelineIntegrate);
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vkCmdDispatch(compute.commandBuffer, numParticles / 256, 1, 1);
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// Release barrier
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if (graphics.queueFamilyIndex != compute.queueFamilyIndex)
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{
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VkBufferMemoryBarrier buffer_barrier =
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{
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VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
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nullptr,
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VK_ACCESS_SHADER_WRITE_BIT,
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0,
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compute.queueFamilyIndex,
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graphics.queueFamilyIndex,
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compute.storageBuffer.buffer,
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0,
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compute.storageBuffer.size
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};
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vkCmdPipelineBarrier(
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compute.commandBuffer,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
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0,
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0, nullptr,
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1, &buffer_barrier,
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0, nullptr);
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}
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vkEndCommandBuffer(compute.commandBuffer);
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}
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// Setup and fill the compute shader storage buffers containing the particles
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void prepareStorageBuffers()
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{
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#if 0
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std::vector<glm::vec3> attractors = {
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glm::vec3(2.5f, 1.5f, 0.0f),
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glm::vec3(-2.5f, -1.5f, 0.0f),
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};
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#else
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std::vector<glm::vec3> attractors = {
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glm::vec3(5.0f, 0.0f, 0.0f),
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glm::vec3(-5.0f, 0.0f, 0.0f),
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glm::vec3(0.0f, 0.0f, 5.0f),
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glm::vec3(0.0f, 0.0f, -5.0f),
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glm::vec3(0.0f, 4.0f, 0.0f),
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glm::vec3(0.0f, -8.0f, 0.0f),
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};
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#endif
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numParticles = static_cast<uint32_t>(attractors.size()) * PARTICLES_PER_ATTRACTOR;
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// Initial particle positions
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std::vector<Particle> particleBuffer(numParticles);
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std::default_random_engine rndEngine(benchmark.active ? 0 : (unsigned)time(nullptr));
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std::normal_distribution<float> rndDist(0.0f, 1.0f);
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for (uint32_t i = 0; i < static_cast<uint32_t>(attractors.size()); i++)
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{
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for (uint32_t j = 0; j < PARTICLES_PER_ATTRACTOR; j++)
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{
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Particle &particle = particleBuffer[i * PARTICLES_PER_ATTRACTOR + j];
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// First particle in group as heavy center of gravity
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if (j == 0)
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{
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particle.pos = glm::vec4(attractors[i] * 1.5f, 90000.0f);
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particle.vel = glm::vec4(glm::vec4(0.0f));
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}
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else
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{
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// Position
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glm::vec3 position(attractors[i] + glm::vec3(rndDist(rndEngine), rndDist(rndEngine), rndDist(rndEngine)) * 0.75f);
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float len = glm::length(glm::normalize(position - attractors[i]));
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position.y *= 2.0f - (len * len);
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// Velocity
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glm::vec3 angular = glm::vec3(0.5f, 1.5f, 0.5f) * (((i % 2) == 0) ? 1.0f : -1.0f);
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glm::vec3 velocity = glm::cross((position - attractors[i]), angular) + glm::vec3(rndDist(rndEngine), rndDist(rndEngine), rndDist(rndEngine) * 0.025f);
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float mass = (rndDist(rndEngine) * 0.5f + 0.5f) * 75.0f;
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particle.pos = glm::vec4(position, mass);
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particle.vel = glm::vec4(velocity, 0.0f);
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}
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// Color gradient offset
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particle.vel.w = (float)i * 1.0f / static_cast<uint32_t>(attractors.size());
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}
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}
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compute.ubo.particleCount = numParticles;
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VkDeviceSize storageBufferSize = particleBuffer.size() * sizeof(Particle);
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// Staging
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// SSBO won't be changed on the host after upload so copy to device local memory
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vks::Buffer stagingBuffer;
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vulkanDevice->createBuffer(
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VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
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VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
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&stagingBuffer,
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storageBufferSize,
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particleBuffer.data());
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vulkanDevice->createBuffer(
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// The SSBO will be used as a storage buffer for the compute pipeline and as a vertex buffer in the graphics pipeline
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VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
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VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
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&compute.storageBuffer,
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storageBufferSize);
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// Copy from staging buffer to storage buffer
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VkCommandBuffer copyCmd = VulkanExampleBase::createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
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VkBufferCopy copyRegion = {};
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copyRegion.size = storageBufferSize;
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vkCmdCopyBuffer(copyCmd, stagingBuffer.buffer, compute.storageBuffer.buffer, 1, ©Region);
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// Execute a transfer barrier to the compute queue, if necessary
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if (graphics.queueFamilyIndex != compute.queueFamilyIndex)
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{
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VkBufferMemoryBarrier buffer_barrier =
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{
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VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
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nullptr,
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VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
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0,
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graphics.queueFamilyIndex,
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compute.queueFamilyIndex,
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compute.storageBuffer.buffer,
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0,
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compute.storageBuffer.size
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};
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vkCmdPipelineBarrier(
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copyCmd,
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VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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0,
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0, nullptr,
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1, &buffer_barrier,
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0, nullptr);
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}
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VulkanExampleBase::flushCommandBuffer(copyCmd, queue, true);
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stagingBuffer.destroy();
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// Binding description
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vertices.bindingDescriptions.resize(1);
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vertices.bindingDescriptions[0] =
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vks::initializers::vertexInputBindingDescription(
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VERTEX_BUFFER_BIND_ID,
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sizeof(Particle),
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VK_VERTEX_INPUT_RATE_VERTEX);
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|
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// Attribute descriptions
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// Describes memory layout and shader positions
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vertices.attributeDescriptions.resize(2);
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// Location 0 : Position
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vertices.attributeDescriptions[0] =
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vks::initializers::vertexInputAttributeDescription(
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VERTEX_BUFFER_BIND_ID,
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0,
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VK_FORMAT_R32G32B32A32_SFLOAT,
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offsetof(Particle, pos));
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// Location 1 : Velocity (used for gradient lookup)
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vertices.attributeDescriptions[1] =
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vks::initializers::vertexInputAttributeDescription(
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VERTEX_BUFFER_BIND_ID,
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1,
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VK_FORMAT_R32G32B32A32_SFLOAT,
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offsetof(Particle, vel));
|
|
|
|
// Assign to vertex buffer
|
|
vertices.inputState = vks::initializers::pipelineVertexInputStateCreateInfo();
|
|
vertices.inputState.vertexBindingDescriptionCount = static_cast<uint32_t>(vertices.bindingDescriptions.size());
|
|
vertices.inputState.pVertexBindingDescriptions = vertices.bindingDescriptions.data();
|
|
vertices.inputState.vertexAttributeDescriptionCount = static_cast<uint32_t>(vertices.attributeDescriptions.size());
|
|
vertices.inputState.pVertexAttributeDescriptions = vertices.attributeDescriptions.data();
|
|
}
|
|
|
|
void setupDescriptorPool()
|
|
{
|
|
std::vector<VkDescriptorPoolSize> poolSizes =
|
|
{
|
|
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2),
|
|
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1),
|
|
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2)
|
|
};
|
|
|
|
VkDescriptorPoolCreateInfo descriptorPoolInfo =
|
|
vks::initializers::descriptorPoolCreateInfo(
|
|
static_cast<uint32_t>(poolSizes.size()),
|
|
poolSizes.data(),
|
|
2);
|
|
|
|
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
|
|
}
|
|
|
|
void setupDescriptorSetLayout()
|
|
{
|
|
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings;
|
|
setLayoutBindings = {
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 0),
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 1),
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT, 2),
|
|
};
|
|
|
|
VkDescriptorSetLayoutCreateInfo descriptorLayout =
|
|
vks::initializers::descriptorSetLayoutCreateInfo(
|
|
setLayoutBindings.data(),
|
|
static_cast<uint32_t>(setLayoutBindings.size()));
|
|
|
|
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &graphics.descriptorSetLayout));
|
|
|
|
VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo =
|
|
vks::initializers::pipelineLayoutCreateInfo(
|
|
&graphics.descriptorSetLayout,
|
|
1);
|
|
|
|
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCreateInfo, nullptr, &graphics.pipelineLayout));
|
|
}
|
|
|
|
void setupDescriptorSet()
|
|
{
|
|
VkDescriptorSetAllocateInfo allocInfo =
|
|
vks::initializers::descriptorSetAllocateInfo(
|
|
descriptorPool,
|
|
&graphics.descriptorSetLayout,
|
|
1);
|
|
|
|
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &graphics.descriptorSet));
|
|
|
|
std::vector<VkWriteDescriptorSet> writeDescriptorSets;
|
|
writeDescriptorSets = {
|
|
vks::initializers::writeDescriptorSet(graphics.descriptorSet, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 0, &textures.particle.descriptor),
|
|
vks::initializers::writeDescriptorSet(graphics.descriptorSet, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &textures.gradient.descriptor),
|
|
vks::initializers::writeDescriptorSet(graphics.descriptorSet, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2, &graphics.uniformBuffer.descriptor),
|
|
};
|
|
vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, nullptr);
|
|
}
|
|
|
|
void preparePipelines()
|
|
{
|
|
VkPipelineInputAssemblyStateCreateInfo inputAssemblyState =
|
|
vks::initializers::pipelineInputAssemblyStateCreateInfo(
|
|
VK_PRIMITIVE_TOPOLOGY_POINT_LIST,
|
|
0,
|
|
VK_FALSE);
|
|
|
|
VkPipelineRasterizationStateCreateInfo rasterizationState =
|
|
vks::initializers::pipelineRasterizationStateCreateInfo(
|
|
VK_POLYGON_MODE_FILL,
|
|
VK_CULL_MODE_NONE,
|
|
VK_FRONT_FACE_COUNTER_CLOCKWISE,
|
|
0);
|
|
|
|
VkPipelineColorBlendAttachmentState blendAttachmentState =
|
|
vks::initializers::pipelineColorBlendAttachmentState(
|
|
0xf,
|
|
VK_FALSE);
|
|
|
|
VkPipelineColorBlendStateCreateInfo colorBlendState =
|
|
vks::initializers::pipelineColorBlendStateCreateInfo(
|
|
1,
|
|
&blendAttachmentState);
|
|
|
|
VkPipelineDepthStencilStateCreateInfo depthStencilState =
|
|
vks::initializers::pipelineDepthStencilStateCreateInfo(
|
|
VK_FALSE,
|
|
VK_FALSE,
|
|
VK_COMPARE_OP_ALWAYS);
|
|
|
|
VkPipelineViewportStateCreateInfo viewportState =
|
|
vks::initializers::pipelineViewportStateCreateInfo(1, 1, 0);
|
|
|
|
VkPipelineMultisampleStateCreateInfo multisampleState =
|
|
vks::initializers::pipelineMultisampleStateCreateInfo(
|
|
VK_SAMPLE_COUNT_1_BIT,
|
|
0);
|
|
|
|
std::vector<VkDynamicState> dynamicStateEnables = {
|
|
VK_DYNAMIC_STATE_VIEWPORT,
|
|
VK_DYNAMIC_STATE_SCISSOR
|
|
};
|
|
VkPipelineDynamicStateCreateInfo dynamicState =
|
|
vks::initializers::pipelineDynamicStateCreateInfo(
|
|
dynamicStateEnables.data(),
|
|
static_cast<uint32_t>(dynamicStateEnables.size()),
|
|
0);
|
|
|
|
// Rendering pipeline
|
|
// Load shaders
|
|
std::array<VkPipelineShaderStageCreateInfo,2> shaderStages;
|
|
|
|
shaderStages[0] = loadShader(getAssetPath() + "shaders/computenbody/particle.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
|
|
shaderStages[1] = loadShader(getAssetPath() + "shaders/computenbody/particle.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
|
|
|
|
VkGraphicsPipelineCreateInfo pipelineCreateInfo =
|
|
vks::initializers::pipelineCreateInfo(
|
|
graphics.pipelineLayout,
|
|
renderPass,
|
|
0);
|
|
|
|
pipelineCreateInfo.pVertexInputState = &vertices.inputState;
|
|
pipelineCreateInfo.pInputAssemblyState = &inputAssemblyState;
|
|
pipelineCreateInfo.pRasterizationState = &rasterizationState;
|
|
pipelineCreateInfo.pColorBlendState = &colorBlendState;
|
|
pipelineCreateInfo.pMultisampleState = &multisampleState;
|
|
pipelineCreateInfo.pViewportState = &viewportState;
|
|
pipelineCreateInfo.pDepthStencilState = &depthStencilState;
|
|
pipelineCreateInfo.pDynamicState = &dynamicState;
|
|
pipelineCreateInfo.stageCount = static_cast<uint32_t>(shaderStages.size());
|
|
pipelineCreateInfo.pStages = shaderStages.data();
|
|
pipelineCreateInfo.renderPass = renderPass;
|
|
|
|
// Additive blending
|
|
blendAttachmentState.colorWriteMask = 0xF;
|
|
blendAttachmentState.blendEnable = VK_TRUE;
|
|
blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
|
|
blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
|
|
blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE;
|
|
blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
|
|
blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
|
|
blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_DST_ALPHA;
|
|
|
|
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &graphics.pipeline));
|
|
}
|
|
|
|
void prepareGraphics()
|
|
{
|
|
prepareStorageBuffers();
|
|
prepareUniformBuffers();
|
|
setupDescriptorSetLayout();
|
|
preparePipelines();
|
|
setupDescriptorSet();
|
|
|
|
// Semaphore for compute & graphics sync
|
|
VkSemaphoreCreateInfo semaphoreCreateInfo = vks::initializers::semaphoreCreateInfo();
|
|
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCreateInfo, nullptr, &graphics.semaphore));
|
|
}
|
|
|
|
void prepareCompute()
|
|
{
|
|
// Create a compute capable device queue
|
|
// The VulkanDevice::createLogicalDevice functions finds a compute capable queue and prefers queue families that only support compute
|
|
// Depending on the implementation this may result in different queue family indices for graphics and computes,
|
|
// requiring proper synchronization (see the memory barriers in buildComputeCommandBuffer)
|
|
vkGetDeviceQueue(device, compute.queueFamilyIndex, 0, &compute.queue);
|
|
|
|
// Create compute pipeline
|
|
// Compute pipelines are created separate from graphics pipelines even if they use the same queue (family index)
|
|
|
|
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
|
|
// Binding 0 : Particle position storage buffer
|
|
vks::initializers::descriptorSetLayoutBinding(
|
|
VK_DESCRIPTOR_TYPE_STORAGE_BUFFER,
|
|
VK_SHADER_STAGE_COMPUTE_BIT,
|
|
0),
|
|
// Binding 1 : Uniform buffer
|
|
vks::initializers::descriptorSetLayoutBinding(
|
|
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
|
|
VK_SHADER_STAGE_COMPUTE_BIT,
|
|
1),
|
|
};
|
|
|
|
VkDescriptorSetLayoutCreateInfo descriptorLayout =
|
|
vks::initializers::descriptorSetLayoutCreateInfo(
|
|
setLayoutBindings.data(),
|
|
static_cast<uint32_t>(setLayoutBindings.size()));
|
|
|
|
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &compute.descriptorSetLayout));
|
|
|
|
VkPipelineLayoutCreateInfo pPipelineLayoutCreateInfo =
|
|
vks::initializers::pipelineLayoutCreateInfo(
|
|
&compute.descriptorSetLayout,
|
|
1);
|
|
|
|
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &compute.pipelineLayout));
|
|
|
|
VkDescriptorSetAllocateInfo allocInfo =
|
|
vks::initializers::descriptorSetAllocateInfo(
|
|
descriptorPool,
|
|
&compute.descriptorSetLayout,
|
|
1);
|
|
|
|
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &compute.descriptorSet));
|
|
|
|
std::vector<VkWriteDescriptorSet> computeWriteDescriptorSets =
|
|
{
|
|
// Binding 0 : Particle position storage buffer
|
|
vks::initializers::writeDescriptorSet(
|
|
compute.descriptorSet,
|
|
VK_DESCRIPTOR_TYPE_STORAGE_BUFFER,
|
|
0,
|
|
&compute.storageBuffer.descriptor),
|
|
// Binding 1 : Uniform buffer
|
|
vks::initializers::writeDescriptorSet(
|
|
compute.descriptorSet,
|
|
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
|
|
1,
|
|
&compute.uniformBuffer.descriptor)
|
|
};
|
|
|
|
vkUpdateDescriptorSets(device, static_cast<uint32_t>(computeWriteDescriptorSets.size()), computeWriteDescriptorSets.data(), 0, nullptr);
|
|
|
|
// Create pipelines
|
|
VkComputePipelineCreateInfo computePipelineCreateInfo = vks::initializers::computePipelineCreateInfo(compute.pipelineLayout, 0);
|
|
|
|
// 1st pass
|
|
computePipelineCreateInfo.stage = loadShader(getAssetPath() + "shaders/computenbody/particle_calculate.comp.spv", VK_SHADER_STAGE_COMPUTE_BIT);
|
|
|
|
// Set shader parameters via specialization constants
|
|
struct SpecializationData {
|
|
uint32_t sharedDataSize;
|
|
float gravity;
|
|
float power;
|
|
float soften;
|
|
} specializationData;
|
|
|
|
std::vector<VkSpecializationMapEntry> specializationMapEntries;
|
|
specializationMapEntries.push_back(vks::initializers::specializationMapEntry(0, offsetof(SpecializationData, sharedDataSize), sizeof(uint32_t)));
|
|
specializationMapEntries.push_back(vks::initializers::specializationMapEntry(1, offsetof(SpecializationData, gravity), sizeof(float)));
|
|
specializationMapEntries.push_back(vks::initializers::specializationMapEntry(2, offsetof(SpecializationData, power), sizeof(float)));
|
|
specializationMapEntries.push_back(vks::initializers::specializationMapEntry(3, offsetof(SpecializationData, soften), sizeof(float)));
|
|
|
|
specializationData.sharedDataSize = std::min((uint32_t)1024, (uint32_t)(vulkanDevice->properties.limits.maxComputeSharedMemorySize / sizeof(glm::vec4)));
|
|
|
|
specializationData.gravity = 0.002f;
|
|
specializationData.power = 0.75f;
|
|
specializationData.soften = 0.05f;
|
|
|
|
VkSpecializationInfo specializationInfo =
|
|
vks::initializers::specializationInfo(static_cast<uint32_t>(specializationMapEntries.size()), specializationMapEntries.data(), sizeof(specializationData), &specializationData);
|
|
computePipelineCreateInfo.stage.pSpecializationInfo = &specializationInfo;
|
|
|
|
VK_CHECK_RESULT(vkCreateComputePipelines(device, pipelineCache, 1, &computePipelineCreateInfo, nullptr, &compute.pipelineCalculate));
|
|
|
|
// 2nd pass
|
|
computePipelineCreateInfo.stage = loadShader(getAssetPath() + "shaders/computenbody/particle_integrate.comp.spv", VK_SHADER_STAGE_COMPUTE_BIT);
|
|
VK_CHECK_RESULT(vkCreateComputePipelines(device, pipelineCache, 1, &computePipelineCreateInfo, nullptr, &compute.pipelineIntegrate));
|
|
|
|
// Separate command pool as queue family for compute may be different than graphics
|
|
VkCommandPoolCreateInfo cmdPoolInfo = {};
|
|
cmdPoolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
|
|
cmdPoolInfo.queueFamilyIndex = compute.queueFamilyIndex;
|
|
cmdPoolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
|
|
VK_CHECK_RESULT(vkCreateCommandPool(device, &cmdPoolInfo, nullptr, &compute.commandPool));
|
|
|
|
// Create a command buffer for compute operations
|
|
compute.commandBuffer = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, compute.commandPool);
|
|
|
|
// Semaphore for compute & graphics sync
|
|
VkSemaphoreCreateInfo semaphoreCreateInfo = vks::initializers::semaphoreCreateInfo();
|
|
VK_CHECK_RESULT(vkCreateSemaphore(device, &semaphoreCreateInfo, nullptr, &compute.semaphore));
|
|
|
|
// Signal the semaphore
|
|
VkSubmitInfo submitInfo = vks::initializers::submitInfo();
|
|
submitInfo.signalSemaphoreCount = 1;
|
|
submitInfo.pSignalSemaphores = &compute.semaphore;
|
|
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
|
|
VK_CHECK_RESULT(vkQueueWaitIdle(queue));
|
|
|
|
// Build a single command buffer containing the compute dispatch commands
|
|
buildComputeCommandBuffer();
|
|
|
|
// If graphics and compute queue family indices differ, acquire and immediately release the storage buffer, so that the initial acquire from the graphics command buffers are matched up properly
|
|
if (graphics.queueFamilyIndex != compute.queueFamilyIndex)
|
|
{
|
|
// Create a transient command buffer for setting up the initial buffer transfer state
|
|
VkCommandBuffer transferCmd = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, compute.commandPool, true);
|
|
|
|
VkBufferMemoryBarrier acquire_buffer_barrier =
|
|
{
|
|
VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
|
|
nullptr,
|
|
0,
|
|
VK_ACCESS_SHADER_WRITE_BIT,
|
|
graphics.queueFamilyIndex,
|
|
compute.queueFamilyIndex,
|
|
compute.storageBuffer.buffer,
|
|
0,
|
|
compute.storageBuffer.size
|
|
};
|
|
vkCmdPipelineBarrier(
|
|
transferCmd,
|
|
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
|
|
VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
|
|
0,
|
|
0, nullptr,
|
|
1, &acquire_buffer_barrier,
|
|
0, nullptr);
|
|
|
|
VkBufferMemoryBarrier release_buffer_barrier =
|
|
{
|
|
VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
|
|
nullptr,
|
|
VK_ACCESS_SHADER_WRITE_BIT,
|
|
0,
|
|
compute.queueFamilyIndex,
|
|
graphics.queueFamilyIndex,
|
|
compute.storageBuffer.buffer,
|
|
0,
|
|
compute.storageBuffer.size
|
|
};
|
|
vkCmdPipelineBarrier(
|
|
transferCmd,
|
|
VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
|
|
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
|
|
0,
|
|
0, nullptr,
|
|
1, &release_buffer_barrier,
|
|
0, nullptr);
|
|
|
|
vulkanDevice->flushCommandBuffer(transferCmd, compute.queue, compute.commandPool);
|
|
}
|
|
}
|
|
|
|
// Prepare and initialize uniform buffer containing shader uniforms
|
|
void prepareUniformBuffers()
|
|
{
|
|
// Compute shader uniform buffer block
|
|
vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
|
|
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
|
|
&compute.uniformBuffer,
|
|
sizeof(compute.ubo));
|
|
|
|
// Map for host access
|
|
VK_CHECK_RESULT(compute.uniformBuffer.map());
|
|
|
|
// Vertex shader uniform buffer block
|
|
vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
|
|
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
|
|
&graphics.uniformBuffer,
|
|
sizeof(graphics.ubo));
|
|
|
|
// Map for host access
|
|
VK_CHECK_RESULT(graphics.uniformBuffer.map());
|
|
|
|
updateComputeUniformBuffers();
|
|
updateGraphicsUniformBuffers();
|
|
}
|
|
|
|
void updateComputeUniformBuffers()
|
|
{
|
|
compute.ubo.deltaT = paused ? 0.0f : frameTimer * 0.05f;
|
|
memcpy(compute.uniformBuffer.mapped, &compute.ubo, sizeof(compute.ubo));
|
|
}
|
|
|
|
void updateGraphicsUniformBuffers()
|
|
{
|
|
graphics.ubo.projection = camera.matrices.perspective;
|
|
graphics.ubo.view = camera.matrices.view;
|
|
graphics.ubo.screenDim = glm::vec2((float)width, (float)height);
|
|
memcpy(graphics.uniformBuffer.mapped, &graphics.ubo, sizeof(graphics.ubo));
|
|
}
|
|
|
|
void draw()
|
|
{
|
|
VulkanExampleBase::prepareFrame();
|
|
|
|
VkPipelineStageFlags graphicsWaitStageMasks[] = { VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT };
|
|
VkSemaphore graphicsWaitSemaphores[] = { compute.semaphore, semaphores.presentComplete };
|
|
VkSemaphore graphicsSignalSemaphores[] = { graphics.semaphore, semaphores.renderComplete };
|
|
|
|
// Submit graphics commands
|
|
submitInfo.commandBufferCount = 1;
|
|
submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
|
|
submitInfo.waitSemaphoreCount = 2;
|
|
submitInfo.pWaitSemaphores = graphicsWaitSemaphores;
|
|
submitInfo.pWaitDstStageMask = graphicsWaitStageMasks;
|
|
submitInfo.signalSemaphoreCount = 2;
|
|
submitInfo.pSignalSemaphores = graphicsSignalSemaphores;
|
|
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
|
|
|
|
VulkanExampleBase::submitFrame();
|
|
|
|
// Wait for rendering finished
|
|
VkPipelineStageFlags waitStageMask = VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT;
|
|
|
|
// Submit compute commands
|
|
VkSubmitInfo computeSubmitInfo = vks::initializers::submitInfo();
|
|
computeSubmitInfo.commandBufferCount = 1;
|
|
computeSubmitInfo.pCommandBuffers = &compute.commandBuffer;
|
|
computeSubmitInfo.waitSemaphoreCount = 1;
|
|
computeSubmitInfo.pWaitSemaphores = &graphics.semaphore;
|
|
computeSubmitInfo.pWaitDstStageMask = &waitStageMask;
|
|
computeSubmitInfo.signalSemaphoreCount = 1;
|
|
computeSubmitInfo.pSignalSemaphores = &compute.semaphore;
|
|
VK_CHECK_RESULT(vkQueueSubmit(compute.queue, 1, &computeSubmitInfo, VK_NULL_HANDLE));
|
|
}
|
|
|
|
void prepare()
|
|
{
|
|
VulkanExampleBase::prepare();
|
|
// We will be using the queue family indices to check if graphics and compute queue families differ
|
|
// If that's the case, we need additional barriers for acquiring and releasing resources
|
|
graphics.queueFamilyIndex = vulkanDevice->queueFamilyIndices.graphics;
|
|
compute.queueFamilyIndex = vulkanDevice->queueFamilyIndices.compute;
|
|
loadAssets();
|
|
setupDescriptorPool();
|
|
prepareGraphics();
|
|
prepareCompute();
|
|
buildCommandBuffers();
|
|
prepared = true;
|
|
}
|
|
|
|
virtual void render()
|
|
{
|
|
if (!prepared)
|
|
return;
|
|
draw();
|
|
updateComputeUniformBuffers();
|
|
if (camera.updated) {
|
|
updateGraphicsUniformBuffers();
|
|
}
|
|
}
|
|
};
|
|
|
|
VULKAN_EXAMPLE_MAIN() |