752 lines
30 KiB
C++
752 lines
30 KiB
C++
/*
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* Vulkan Example - Dynamic terrain tessellation
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*
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* This samples draw a terrain from a heightmap texture and uses tessellation to add in details based on camera distance
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* The height level is generated in the vertex shader by reading from the heightmap image
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*
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* Copyright (C) 2016-2023 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 "vulkanexamplebase.h"
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#include "VulkanglTFModel.h"
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#include "frustum.hpp"
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#include <ktx.h>
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#include <ktxvulkan.h>
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class VulkanExample : public VulkanExampleBase
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{
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public:
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bool wireframe = false;
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bool tessellation = true;
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// Holds the buffers for rendering the tessellated terrain
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struct {
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struct Vertices {
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VkBuffer buffer{ VK_NULL_HANDLE };
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VkDeviceMemory memory{ VK_NULL_HANDLE };
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} vertices;
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struct Indices {
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int count;
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VkBuffer buffer{ VK_NULL_HANDLE };
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VkDeviceMemory memory{ VK_NULL_HANDLE };
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} indices;
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} terrain;
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struct {
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vks::Texture2D heightMap;
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vks::Texture2D skySphere;
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vks::Texture2DArray terrainArray;
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} textures;
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struct {
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vkglTF::Model skysphere;
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} models;
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struct {
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vks::Buffer terrainTessellation;
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vks::Buffer skysphereVertex;
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} uniformBuffers;
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// Shared values for tessellation control and evaluation stages
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struct UniformDataTessellation {
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glm::mat4 projection;
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glm::mat4 modelview;
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glm::vec4 lightPos = glm::vec4(-48.0f, -40.0f, 46.0f, 0.0f);
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glm::vec4 frustumPlanes[6];
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float displacementFactor = 32.0f;
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float tessellationFactor = 0.75f;
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glm::vec2 viewportDim;
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// Desired size of tessellated quad patch edge
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float tessellatedEdgeSize = 20.0f;
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} uniformDataTessellation;
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// Skysphere vertex shader stage
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struct UniformDataVertex {
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glm::mat4 mvp;
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} uniformDataVertex;
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struct Pipelines {
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VkPipeline terrain{ VK_NULL_HANDLE };
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VkPipeline wireframe{ VK_NULL_HANDLE };
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VkPipeline skysphere{ VK_NULL_HANDLE };
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} pipelines;
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struct {
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VkDescriptorSetLayout terrain{ VK_NULL_HANDLE };
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VkDescriptorSetLayout skysphere{ VK_NULL_HANDLE };
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} descriptorSetLayouts;
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struct {
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VkPipelineLayout terrain{ VK_NULL_HANDLE };
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VkPipelineLayout skysphere{ VK_NULL_HANDLE };
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} pipelineLayouts;
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struct {
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VkDescriptorSet terrain{ VK_NULL_HANDLE };
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VkDescriptorSet skysphere{ VK_NULL_HANDLE };
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} descriptorSets;
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// If supported, this sample will gather pipeline statistics to show e.g. tessellation related information
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struct {
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VkBuffer buffer{ VK_NULL_HANDLE };
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VkDeviceMemory memory{ VK_NULL_HANDLE };
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} queryResult;
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VkQueryPool queryPool{ VK_NULL_HANDLE };
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uint64_t pipelineStats[2] = { 0 };
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// View frustum passed to tessellation control shader for culling
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vks::Frustum frustum;
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VulkanExample() : VulkanExampleBase()
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{
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title = "Dynamic terrain tessellation";
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camera.type = Camera::CameraType::firstperson;
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camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 512.0f);
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camera.setRotation(glm::vec3(-12.0f, 159.0f, 0.0f));
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camera.setTranslation(glm::vec3(18.0f, 22.5f, 57.5f));
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camera.movementSpeed = 10.0f;
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}
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~VulkanExample()
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{
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if (device) {
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vkDestroyPipeline(device, pipelines.terrain, nullptr);
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if (pipelines.wireframe != VK_NULL_HANDLE) {
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vkDestroyPipeline(device, pipelines.wireframe, nullptr);
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}
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vkDestroyPipeline(device, pipelines.skysphere, nullptr);
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vkDestroyPipelineLayout(device, pipelineLayouts.skysphere, nullptr);
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vkDestroyPipelineLayout(device, pipelineLayouts.terrain, nullptr);
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vkDestroyDescriptorSetLayout(device, descriptorSetLayouts.terrain, nullptr);
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vkDestroyDescriptorSetLayout(device, descriptorSetLayouts.skysphere, nullptr);
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uniformBuffers.skysphereVertex.destroy();
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uniformBuffers.terrainTessellation.destroy();
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textures.heightMap.destroy();
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textures.skySphere.destroy();
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textures.terrainArray.destroy();
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vkDestroyBuffer(device, terrain.vertices.buffer, nullptr);
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vkFreeMemory(device, terrain.vertices.memory, nullptr);
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vkDestroyBuffer(device, terrain.indices.buffer, nullptr);
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vkFreeMemory(device, terrain.indices.memory, nullptr);
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if (queryPool != VK_NULL_HANDLE) {
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vkDestroyQueryPool(device, queryPool, nullptr);
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vkDestroyBuffer(device, queryResult.buffer, nullptr);
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vkFreeMemory(device, queryResult.memory, nullptr);
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}
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}
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}
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// Enable physical device features required for this example
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virtual void getEnabledFeatures()
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{
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// Tessellation shader support is required for this example
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if (deviceFeatures.tessellationShader) {
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enabledFeatures.tessellationShader = VK_TRUE;
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} else {
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vks::tools::exitFatal("Selected GPU does not support tessellation shaders!", VK_ERROR_FEATURE_NOT_PRESENT);
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}
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// Fill mode non solid is required for wireframe display
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if (deviceFeatures.fillModeNonSolid) {
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enabledFeatures.fillModeNonSolid = VK_TRUE;
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};
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// Enable pipeline statistics if supported (to display them in the UI)
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if (deviceFeatures.pipelineStatisticsQuery) {
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enabledFeatures.pipelineStatisticsQuery = VK_TRUE;
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};
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// Enable anisotropic filtering if supported
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if (deviceFeatures.samplerAnisotropy) {
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enabledFeatures.samplerAnisotropy = VK_TRUE;
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}
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}
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// Setup a pool and a buffer for storing pipeline statistics results
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void setupQueryResultBuffer()
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{
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uint32_t bufSize = 2 * sizeof(uint64_t);
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VkMemoryRequirements memReqs;
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VkMemoryAllocateInfo memAlloc = vks::initializers::memoryAllocateInfo();
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VkBufferCreateInfo bufferCreateInfo =
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vks::initializers::bufferCreateInfo(
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VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
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bufSize);
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// Results are saved in a host visible buffer for easy access by the application
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VK_CHECK_RESULT(vkCreateBuffer(device, &bufferCreateInfo, nullptr, &queryResult.buffer));
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vkGetBufferMemoryRequirements(device, queryResult.buffer, &memReqs);
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memAlloc.allocationSize = memReqs.size;
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memAlloc.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
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VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &queryResult.memory));
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VK_CHECK_RESULT(vkBindBufferMemory(device, queryResult.buffer, queryResult.memory, 0));
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// Create query pool
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if (deviceFeatures.pipelineStatisticsQuery) {
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VkQueryPoolCreateInfo queryPoolInfo = {};
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queryPoolInfo.sType = VK_STRUCTURE_TYPE_QUERY_POOL_CREATE_INFO;
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queryPoolInfo.queryType = VK_QUERY_TYPE_PIPELINE_STATISTICS;
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queryPoolInfo.pipelineStatistics =
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VK_QUERY_PIPELINE_STATISTIC_VERTEX_SHADER_INVOCATIONS_BIT |
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VK_QUERY_PIPELINE_STATISTIC_TESSELLATION_EVALUATION_SHADER_INVOCATIONS_BIT;
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queryPoolInfo.queryCount = 2;
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VK_CHECK_RESULT(vkCreateQueryPool(device, &queryPoolInfo, NULL, &queryPool));
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}
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}
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// Retrieves the results of the pipeline statistics query submitted to the command buffer
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void getQueryResults()
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{
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// We use vkGetQueryResults to copy the results into a host visible buffer
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vkGetQueryPoolResults(
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device,
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queryPool,
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0,
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1,
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sizeof(pipelineStats),
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pipelineStats,
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sizeof(uint64_t),
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VK_QUERY_RESULT_64_BIT);
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}
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void loadAssets()
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{
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const uint32_t glTFLoadingFlags = vkglTF::FileLoadingFlags::PreTransformVertices | vkglTF::FileLoadingFlags::PreMultiplyVertexColors | vkglTF::FileLoadingFlags::FlipY;
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models.skysphere.loadFromFile(getAssetPath() + "models/sphere.gltf", vulkanDevice, queue, glTFLoadingFlags);
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textures.skySphere.loadFromFile(getAssetPath() + "textures/skysphere_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
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// Terrain textures are stored in a texture array with layers corresponding to terrain height
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textures.terrainArray.loadFromFile(getAssetPath() + "textures/terrain_texturearray_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
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// Height data is stored in a one-channel texture
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textures.heightMap.loadFromFile(getAssetPath() + "textures/terrain_heightmap_r16.ktx", VK_FORMAT_R16_UNORM, vulkanDevice, queue);
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VkSamplerCreateInfo samplerInfo = vks::initializers::samplerCreateInfo();
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// Setup a mirroring sampler for the height map
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vkDestroySampler(device, textures.heightMap.sampler, nullptr);
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samplerInfo.magFilter = VK_FILTER_LINEAR;
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samplerInfo.minFilter = VK_FILTER_LINEAR;
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samplerInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
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samplerInfo.addressModeU = VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT;
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samplerInfo.addressModeV = samplerInfo.addressModeU;
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samplerInfo.addressModeW = samplerInfo.addressModeU;
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samplerInfo.compareOp = VK_COMPARE_OP_NEVER;
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samplerInfo.minLod = 0.0f;
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samplerInfo.maxLod = (float)textures.heightMap.mipLevels;
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samplerInfo.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE;
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VK_CHECK_RESULT(vkCreateSampler(device, &samplerInfo, nullptr, &textures.heightMap.sampler));
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textures.heightMap.descriptor.sampler = textures.heightMap.sampler;
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// Setup a repeating sampler for the terrain texture layers
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vkDestroySampler(device, textures.terrainArray.sampler, nullptr);
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samplerInfo = vks::initializers::samplerCreateInfo();
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samplerInfo.magFilter = VK_FILTER_LINEAR;
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samplerInfo.minFilter = VK_FILTER_LINEAR;
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samplerInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
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samplerInfo.addressModeU = VK_SAMPLER_ADDRESS_MODE_REPEAT;
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samplerInfo.addressModeV = samplerInfo.addressModeU;
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samplerInfo.addressModeW = samplerInfo.addressModeU;
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samplerInfo.compareOp = VK_COMPARE_OP_NEVER;
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samplerInfo.minLod = 0.0f;
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samplerInfo.maxLod = (float)textures.terrainArray.mipLevels;
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samplerInfo.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE;
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if (deviceFeatures.samplerAnisotropy) {
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samplerInfo.maxAnisotropy = 4.0f;
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samplerInfo.anisotropyEnable = VK_TRUE;
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}
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VK_CHECK_RESULT(vkCreateSampler(device, &samplerInfo, nullptr, &textures.terrainArray.sampler));
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textures.terrainArray.descriptor.sampler = textures.terrainArray.sampler;
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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 = defaultClearColor;
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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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renderPassBeginInfo.framebuffer = frameBuffers[i];
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VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
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if (deviceFeatures.pipelineStatisticsQuery) {
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vkCmdResetQueryPool(drawCmdBuffers[i], queryPool, 0, 2);
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}
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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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vkCmdSetLineWidth(drawCmdBuffers[i], 1.0f);
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VkDeviceSize offsets[1] = { 0 };
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// Skysphere
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.skysphere);
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vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.skysphere, 0, 1, &descriptorSets.skysphere, 0, nullptr);
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models.skysphere.draw(drawCmdBuffers[i]);
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// Tessellated terrain
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if (deviceFeatures.pipelineStatisticsQuery) {
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// Begin pipeline statistics query
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vkCmdBeginQuery(drawCmdBuffers[i], queryPool, 0, 0);
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}
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// Render
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, wireframe ? pipelines.wireframe : pipelines.terrain);
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vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayouts.terrain, 0, 1, &descriptorSets.terrain, 0, nullptr);
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vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, 1, &terrain.vertices.buffer, offsets);
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vkCmdBindIndexBuffer(drawCmdBuffers[i], terrain.indices.buffer, 0, VK_INDEX_TYPE_UINT32);
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vkCmdDrawIndexed(drawCmdBuffers[i], terrain.indices.count, 1, 0, 0, 0);
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if (deviceFeatures.pipelineStatisticsQuery) {
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// End pipeline statistics query
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vkCmdEndQuery(drawCmdBuffers[i], queryPool, 0);
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}
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drawUI(drawCmdBuffers[i]);
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vkCmdEndRenderPass(drawCmdBuffers[i]);
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VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
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}
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}
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// Generate a terrain quad patch with normals based on heightmap data
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void generateTerrain()
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{
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const uint32_t patchSize{ 64 };
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const float uvScale{ 1.0f };
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uint16_t* heightdata;
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uint32_t dim;
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uint32_t scale;
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ktxResult result;
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ktxTexture* ktxTexture;
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// We load the heightmap from an un-compressed ktx image with one channel that contains heights
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std::string filename = getAssetPath() + "textures/terrain_heightmap_r16.ktx";
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#if defined(__ANDROID__)
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// On Android we need to load the file using the asset manager
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AAsset* asset = AAssetManager_open(androidApp->activity->assetManager, filename.c_str(), AASSET_MODE_STREAMING);
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assert(asset);
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size_t size = AAsset_getLength(asset);
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assert(size > 0);
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ktx_uint8_t* textureData = new ktx_uint8_t[size];
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AAsset_read(asset, textureData, size);
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AAsset_close(asset);
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result = ktxTexture_CreateFromMemory(textureData, size, KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT, &ktxTexture);
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delete[] textureData;
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#else
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result = ktxTexture_CreateFromNamedFile(filename.c_str(), KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT, &ktxTexture);
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#endif
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assert(result == KTX_SUCCESS);
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ktx_size_t ktxSize = ktxTexture_GetImageSize(ktxTexture, 0);
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ktx_uint8_t* ktxImage = ktxTexture_GetData(ktxTexture);
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dim = ktxTexture->baseWidth;
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heightdata = new uint16_t[dim * dim];
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memcpy(heightdata, ktxImage, ktxSize);
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scale = dim / patchSize;
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ktxTexture_Destroy(ktxTexture);
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const uint32_t vertexCount = patchSize * patchSize;
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// We use the Vertex definition from the glTF model loader, so we can re-use the vertex input state
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vkglTF::Vertex *vertices = new vkglTF::Vertex[vertexCount];
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const float wx = 2.0f;
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const float wy = 2.0f;
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// Generate a two-dimensional vertex patch
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for (auto x = 0; x < patchSize; x++) {
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for (auto y = 0; y < patchSize; y++) {
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uint32_t index = (x + y * patchSize);
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vertices[index].pos[0] = x * wx + wx / 2.0f - (float)patchSize * wx / 2.0f;
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vertices[index].pos[1] = 0.0f;
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vertices[index].pos[2] = y * wy + wy / 2.0f - (float)patchSize * wy / 2.0f;
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vertices[index].uv = glm::vec2((float)x / (patchSize - 1), (float)y / (patchSize - 1)) * uvScale;
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}
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}
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// Calculate normals from the height map using a sobel filter
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for (auto x = 0; x < patchSize; x++) {
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for (auto y = 0; y < patchSize; y++) {
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// We get
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float heights[3][3];
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for (auto sx = -1; sx <= 1; sx++) {
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for (auto sy = -1; sy <= 1; sy++) {
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// Get height at sampled position from heightmap
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glm::ivec2 rpos = glm::ivec2(x + sx, y + sy) * glm::ivec2(scale);
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rpos.x = std::max(0, std::min(rpos.x, (int)dim - 1));
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rpos.y = std::max(0, std::min(rpos.y, (int)dim - 1));
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rpos /= glm::ivec2(scale);
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heights[sx + 1][sy + 1] = *(heightdata + (rpos.x + rpos.y * dim) * scale) / 65535.0f;
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}
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}
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glm::vec3 normal;
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// Gx sobel filter
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normal.x = heights[0][0] - heights[2][0] + 2.0f * heights[0][1] - 2.0f * heights[2][1] + heights[0][2] - heights[2][2];
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// Gy sobel filter
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normal.z = heights[0][0] + 2.0f * heights[1][0] + heights[2][0] - heights[0][2] - 2.0f * heights[1][2] - heights[2][2];
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// Calculate missing up component of the normal using the filtered x and y axis
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// The first value controls the bump strength
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normal.y = 0.25f * sqrt( 1.0f - normal.x * normal.x - normal.z * normal.z);
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vertices[x + y * patchSize].normal = glm::normalize(normal * glm::vec3(2.0f, 1.0f, 2.0f));
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}
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}
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delete[] heightdata;
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// Generate indices
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const uint32_t w = (patchSize - 1);
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const uint32_t indexCount = w * w * 4;
|
|
uint32_t *indices = new uint32_t[indexCount];
|
|
for (auto x = 0; x < w; x++)
|
|
{
|
|
for (auto y = 0; y < w; y++)
|
|
{
|
|
uint32_t index = (x + y * w) * 4;
|
|
indices[index] = (x + y * patchSize);
|
|
indices[index + 1] = indices[index] + patchSize;
|
|
indices[index + 2] = indices[index + 1] + 1;
|
|
indices[index + 3] = indices[index] + 1;
|
|
}
|
|
}
|
|
terrain.indices.count = indexCount;
|
|
|
|
// Upload vertices and indices to device
|
|
|
|
uint32_t vertexBufferSize = vertexCount * sizeof(vkglTF::Vertex);
|
|
uint32_t indexBufferSize = indexCount * sizeof(uint32_t);
|
|
|
|
struct {
|
|
VkBuffer buffer;
|
|
VkDeviceMemory memory;
|
|
} vertexStaging, indexStaging;
|
|
|
|
// Stage the terrain vertex data to the device
|
|
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
|
|
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
|
|
vertexBufferSize,
|
|
&vertexStaging.buffer,
|
|
&vertexStaging.memory,
|
|
vertices));
|
|
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
|
|
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
|
|
indexBufferSize,
|
|
&indexStaging.buffer,
|
|
&indexStaging.memory,
|
|
indices));
|
|
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
|
|
VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
|
|
vertexBufferSize,
|
|
&terrain.vertices.buffer,
|
|
&terrain.vertices.memory));
|
|
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(
|
|
VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
|
|
VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
|
|
indexBufferSize,
|
|
&terrain.indices.buffer,
|
|
&terrain.indices.memory));
|
|
|
|
// Copy from staging buffers
|
|
VkCommandBuffer copyCmd = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
|
|
|
|
VkBufferCopy copyRegion = {};
|
|
|
|
copyRegion.size = vertexBufferSize;
|
|
vkCmdCopyBuffer(
|
|
copyCmd,
|
|
vertexStaging.buffer,
|
|
terrain.vertices.buffer,
|
|
1,
|
|
©Region);
|
|
|
|
copyRegion.size = indexBufferSize;
|
|
vkCmdCopyBuffer(
|
|
copyCmd,
|
|
indexStaging.buffer,
|
|
terrain.indices.buffer,
|
|
1,
|
|
©Region);
|
|
|
|
vulkanDevice->flushCommandBuffer(copyCmd, queue, true);
|
|
|
|
vkDestroyBuffer(device, vertexStaging.buffer, nullptr);
|
|
vkFreeMemory(device, vertexStaging.memory, nullptr);
|
|
vkDestroyBuffer(device, indexStaging.buffer, nullptr);
|
|
vkFreeMemory(device, indexStaging.memory, nullptr);
|
|
|
|
delete[] vertices;
|
|
delete[] indices;
|
|
}
|
|
|
|
void setupDescriptors()
|
|
{
|
|
// Pool
|
|
std::vector<VkDescriptorPoolSize> poolSizes = {
|
|
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 3),
|
|
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 3)
|
|
};
|
|
VkDescriptorPoolCreateInfo descriptorPoolInfo = vks::initializers::descriptorPoolCreateInfo(poolSizes, 2);
|
|
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
|
|
|
|
// Layouts
|
|
VkDescriptorSetLayoutCreateInfo descriptorLayout;
|
|
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings;
|
|
|
|
// Terrain
|
|
setLayoutBindings = {
|
|
// Binding 0 : Shared Tessellation shader ubo
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT | VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT, 0),
|
|
// Binding 1 : Height map
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT | VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 1),
|
|
// Binding 2 : Terrain texture array layers
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 2),
|
|
};
|
|
descriptorLayout = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings.data(), static_cast<uint32_t>(setLayoutBindings.size()));
|
|
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayouts.terrain));
|
|
|
|
// Skysphere
|
|
setLayoutBindings = {
|
|
// Binding 0 : Vertex shader ubo
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT, 0),
|
|
// Binding 1 : Color map
|
|
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 1),
|
|
};
|
|
descriptorLayout = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings.data(), static_cast<uint32_t>(setLayoutBindings.size()));
|
|
|
|
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayouts.skysphere));
|
|
// Sets
|
|
VkDescriptorSetAllocateInfo allocInfo;
|
|
std::vector<VkWriteDescriptorSet> writeDescriptorSets;
|
|
|
|
// Terrain
|
|
allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayouts.terrain, 1);
|
|
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.terrain));
|
|
|
|
writeDescriptorSets = {
|
|
// Binding 0 : Shared tessellation shader ubo
|
|
vks::initializers::writeDescriptorSet(descriptorSets.terrain, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffers.terrainTessellation.descriptor),
|
|
// Binding 1 : Height map
|
|
vks::initializers::writeDescriptorSet(descriptorSets.terrain, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &textures.heightMap.descriptor),
|
|
// Binding 2 : Terrain texture array layers
|
|
vks::initializers::writeDescriptorSet(descriptorSets.terrain, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2, &textures.terrainArray.descriptor),
|
|
};
|
|
vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, nullptr);
|
|
|
|
// Skysphere
|
|
allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayouts.skysphere, 1);
|
|
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.skysphere));
|
|
writeDescriptorSets = {
|
|
// Binding 0 : Vertex shader ubo
|
|
vks::initializers::writeDescriptorSet(descriptorSets.skysphere, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffers.skysphereVertex.descriptor),
|
|
// Binding 1 : Fragment shader color map
|
|
vks::initializers::writeDescriptorSet(descriptorSets.skysphere, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &textures.skySphere.descriptor),
|
|
};
|
|
vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, nullptr);
|
|
}
|
|
|
|
void preparePipelines()
|
|
{
|
|
// Layouts
|
|
VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo;
|
|
|
|
pipelineLayoutCreateInfo = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayouts.terrain, 1);
|
|
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCreateInfo, nullptr, &pipelineLayouts.terrain));
|
|
|
|
pipelineLayoutCreateInfo = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayouts.skysphere, 1);
|
|
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCreateInfo, nullptr, &pipelineLayouts.skysphere));
|
|
|
|
// Pipelines
|
|
VkPipelineRasterizationStateCreateInfo rasterizationState = vks::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_BACK_BIT, 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_TRUE, VK_TRUE, VK_COMPARE_OP_LESS_OR_EQUAL);
|
|
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, VK_DYNAMIC_STATE_LINE_WIDTH };
|
|
VkPipelineDynamicStateCreateInfo dynamicState = vks::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables);
|
|
std::array<VkPipelineShaderStageCreateInfo, 4> shaderStages;
|
|
|
|
// We render the terrain as a grid of quad patches
|
|
VkPipelineInputAssemblyStateCreateInfo inputAssemblyState = vks::initializers::pipelineInputAssemblyStateCreateInfo(VK_PRIMITIVE_TOPOLOGY_PATCH_LIST, 0, VK_FALSE);
|
|
VkPipelineTessellationStateCreateInfo tessellationState = vks::initializers::pipelineTessellationStateCreateInfo(4);
|
|
// Terrain tessellation pipeline
|
|
shaderStages[0] = loadShader(getShadersPath() + "terraintessellation/terrain.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
|
|
shaderStages[1] = loadShader(getShadersPath() + "terraintessellation/terrain.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
|
|
shaderStages[2] = loadShader(getShadersPath() + "terraintessellation/terrain.tesc.spv", VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT);
|
|
shaderStages[3] = loadShader(getShadersPath() + "terraintessellation/terrain.tese.spv", VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT);
|
|
|
|
VkGraphicsPipelineCreateInfo pipelineCI = vks::initializers::pipelineCreateInfo(pipelineLayouts.terrain, renderPass);
|
|
pipelineCI.pInputAssemblyState = &inputAssemblyState;
|
|
pipelineCI.pRasterizationState = &rasterizationState;
|
|
pipelineCI.pColorBlendState = &colorBlendState;
|
|
pipelineCI.pMultisampleState = &multisampleState;
|
|
pipelineCI.pViewportState = &viewportState;
|
|
pipelineCI.pDepthStencilState = &depthStencilState;
|
|
pipelineCI.pDynamicState = &dynamicState;
|
|
pipelineCI.pTessellationState = &tessellationState;
|
|
pipelineCI.stageCount = static_cast<uint32_t>(shaderStages.size());
|
|
pipelineCI.pStages = shaderStages.data();
|
|
pipelineCI.pVertexInputState = vkglTF::Vertex::getPipelineVertexInputState({ vkglTF::VertexComponent::Position, vkglTF::VertexComponent::Normal, vkglTF::VertexComponent::UV });
|
|
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.terrain));
|
|
|
|
// Terrain wireframe pipeline (if devie supports it)
|
|
if (deviceFeatures.fillModeNonSolid) {
|
|
rasterizationState.polygonMode = VK_POLYGON_MODE_LINE;
|
|
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.wireframe));
|
|
};
|
|
|
|
// Skysphere pipeline
|
|
rasterizationState.cullMode = VK_CULL_MODE_FRONT_BIT;
|
|
rasterizationState.polygonMode = VK_POLYGON_MODE_FILL;
|
|
// Revert to triangle list topology
|
|
inputAssemblyState.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
|
|
// Reset tessellation state
|
|
pipelineCI.pTessellationState = nullptr;
|
|
// Don't write to depth buffer
|
|
depthStencilState.depthWriteEnable = VK_FALSE;
|
|
pipelineCI.stageCount = 2;
|
|
pipelineCI.layout = pipelineLayouts.skysphere;
|
|
shaderStages[0] = loadShader(getShadersPath() + "terraintessellation/skysphere.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
|
|
shaderStages[1] = loadShader(getShadersPath() + "terraintessellation/skysphere.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
|
|
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.skysphere));
|
|
}
|
|
|
|
// Prepare and initialize uniform buffer containing shader uniforms
|
|
void prepareUniformBuffers()
|
|
{
|
|
// Shared tessellation shader stages uniform buffer
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &uniformBuffers.terrainTessellation, sizeof(UniformDataTessellation)));
|
|
|
|
// Skysphere vertex shader uniform buffer
|
|
VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &uniformBuffers.skysphereVertex, sizeof(UniformDataVertex)));
|
|
|
|
// Map persistent
|
|
VK_CHECK_RESULT(uniformBuffers.terrainTessellation.map());
|
|
VK_CHECK_RESULT(uniformBuffers.skysphereVertex.map());
|
|
}
|
|
|
|
void updateUniformBuffers()
|
|
{
|
|
// Tessellation
|
|
uniformDataTessellation.projection = camera.matrices.perspective;
|
|
uniformDataTessellation.modelview = camera.matrices.view * glm::mat4(1.0f);
|
|
uniformDataTessellation.lightPos.y = -0.5f - uniformDataTessellation.displacementFactor; // todo: Not uesed yet
|
|
uniformDataTessellation.viewportDim = glm::vec2((float)width, (float)height);
|
|
|
|
frustum.update(uniformDataTessellation.projection * uniformDataTessellation.modelview);
|
|
memcpy(uniformDataTessellation.frustumPlanes, frustum.planes.data(), sizeof(glm::vec4) * 6);
|
|
|
|
float savedFactor = uniformDataTessellation.tessellationFactor;
|
|
if (!tessellation)
|
|
{
|
|
// Setting this to zero sets all tessellation factors to 1.0 in the shader
|
|
uniformDataTessellation.tessellationFactor = 0.0f;
|
|
}
|
|
|
|
memcpy(uniformBuffers.terrainTessellation.mapped, &uniformDataTessellation, sizeof(UniformDataTessellation));
|
|
|
|
if (!tessellation)
|
|
{
|
|
uniformDataTessellation.tessellationFactor = savedFactor;
|
|
}
|
|
|
|
// Vertex shader
|
|
uniformDataVertex.mvp = camera.matrices.perspective * glm::mat4(glm::mat3(camera.matrices.view));
|
|
memcpy(uniformBuffers.skysphereVertex.mapped, &uniformDataVertex, sizeof(UniformDataVertex));
|
|
}
|
|
|
|
void prepare()
|
|
{
|
|
VulkanExampleBase::prepare();
|
|
loadAssets();
|
|
generateTerrain();
|
|
if (deviceFeatures.pipelineStatisticsQuery) {
|
|
setupQueryResultBuffer();
|
|
}
|
|
prepareUniformBuffers();
|
|
setupDescriptors();
|
|
preparePipelines();
|
|
buildCommandBuffers();
|
|
prepared = true;
|
|
}
|
|
|
|
void draw()
|
|
{
|
|
VulkanExampleBase::prepareFrame();
|
|
submitInfo.commandBufferCount = 1;
|
|
submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
|
|
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
|
|
// Read query results for displaying in next frame (if the device supports pipeline statistics)
|
|
if (deviceFeatures.pipelineStatisticsQuery) {
|
|
getQueryResults();
|
|
}
|
|
VulkanExampleBase::submitFrame();
|
|
}
|
|
|
|
virtual void render()
|
|
{
|
|
if (!prepared)
|
|
return;
|
|
updateUniformBuffers();
|
|
draw();
|
|
}
|
|
|
|
virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay)
|
|
{
|
|
if (overlay->header("Settings")) {
|
|
|
|
if (overlay->checkBox("Tessellation", &tessellation)) {
|
|
updateUniformBuffers();
|
|
}
|
|
if (overlay->inputFloat("Factor", &uniformDataTessellation.tessellationFactor, 0.05f, 2)) {
|
|
updateUniformBuffers();
|
|
}
|
|
if (deviceFeatures.fillModeNonSolid) {
|
|
if (overlay->checkBox("Wireframe", &wireframe)) {
|
|
buildCommandBuffers();
|
|
}
|
|
}
|
|
}
|
|
if (deviceFeatures.pipelineStatisticsQuery) {
|
|
if (overlay->header("Pipeline statistics")) {
|
|
overlay->text("VS invocations: %d", pipelineStats[0]);
|
|
overlay->text("TE invocations: %d", pipelineStats[1]);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
VULKAN_EXAMPLE_MAIN()
|