308 lines
12 KiB
C++
308 lines
12 KiB
C++
/*
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* Vulkan Example - Displacement mapping with tessellation shaders
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*
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* This samples uses tessellation shaders to displace geometry based on a height map
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*
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* Copyright (C) 2016 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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class VulkanExample : public VulkanExampleBase
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{
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public:
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bool splitScreen = true;
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bool displacement = true;
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vkglTF::Model plane;
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vks::Texture2D colorHeightMap;
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// Uniform data/buffer used by both tessellation shader stages
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struct UniformData {
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glm::mat4 projection;
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glm::mat4 modelView;
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glm::vec4 lightPos = glm::vec4(0.0f, -1.0f, 0.0f, 0.0f);
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float tessAlpha = 1.0f;
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float tessStrength = 0.1f;
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float tessLevel = 64.0f;
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} uniformData;
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vks::Buffer uniformBuffer;
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struct Pipelines {
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VkPipeline solid{ VK_NULL_HANDLE };
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VkPipeline wireframe{ VK_NULL_HANDLE };
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} pipelines;
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VkPipelineLayout pipelineLayout{ VK_NULL_HANDLE };
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VkDescriptorSet descriptorSet{ VK_NULL_HANDLE };
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VkDescriptorSetLayout descriptorSetLayout{ VK_NULL_HANDLE };
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VulkanExample() : VulkanExampleBase()
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{
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title = "Tessellation shader displacement";
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camera.type = Camera::CameraType::lookat;
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camera.setPosition(glm::vec3(0.0f, 0.0f, -1.25f));
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camera.setRotation(glm::vec3(-20.0f, 45.0f, 0.0f));
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camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 256.0f);
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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.solid, 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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vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
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vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
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uniformBuffer.destroy();
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colorHeightMap.destroy();
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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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}
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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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else {
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splitScreen = false;
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}
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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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plane.loadFromFile(getAssetPath() + "models/displacement_plane.gltf", vulkanDevice, queue, glTFLoadingFlags);
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colorHeightMap.loadFromFile(getAssetPath() + "textures/stonefloor03_color_height_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 = 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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// 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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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(splitScreen ? width / 2 : 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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vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSet, 0, NULL);
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plane.bindBuffers(drawCmdBuffers[i]);
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if (splitScreen)
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{
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.wireframe);
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plane.draw(drawCmdBuffers[i]);
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scissor.offset.x = width / 2;
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vkCmdSetScissor(drawCmdBuffers[i], 0, 1, &scissor);
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}
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.solid);
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plane.draw(drawCmdBuffers[i]);
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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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void setupDescriptors()
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{
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// Pool
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std::vector<VkDescriptorPoolSize> poolSizes = {
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vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2),
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vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1)
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};
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VkDescriptorPoolCreateInfo descriptorPoolInfo = vks::initializers::descriptorPoolCreateInfo(poolSizes, 2);
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VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
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// Layout
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std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
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// Binding 0 : Tessellation shader ubo
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vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT | VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT, 0),
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// Binding 1 : Combined color (rgb) and height (alpha) map
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vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 1),
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};
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VkDescriptorSetLayoutCreateInfo descriptorLayout = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings);
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VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayout));
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// Set
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VkDescriptorSetAllocateInfo allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayout, 1);
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VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSet));
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std::vector<VkWriteDescriptorSet> writeDescriptorSets = {
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// Binding 0 : Tessellation shader ubo
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vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffer.descriptor),
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// Binding 1 : Color and displacement map (alpha channel)
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vks::initializers::writeDescriptorSet(descriptorSet, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &colorHeightMap.descriptor),
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};
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vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, nullptr);
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}
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void preparePipelines()
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{
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// Layout
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VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayout, 1);
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VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCreateInfo, nullptr, &pipelineLayout));
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// Pipelines
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VkPipelineInputAssemblyStateCreateInfo inputAssemblyState = vks::initializers::pipelineInputAssemblyStateCreateInfo(VK_PRIMITIVE_TOPOLOGY_PATCH_LIST, 0, VK_FALSE);
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VkPipelineRasterizationStateCreateInfo rasterizationState = vks::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_BACK_BIT, VK_FRONT_FACE_COUNTER_CLOCKWISE, 0);
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VkPipelineColorBlendAttachmentState blendAttachmentState = vks::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE);
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VkPipelineColorBlendStateCreateInfo colorBlendState = vks::initializers::pipelineColorBlendStateCreateInfo(1, &blendAttachmentState);
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VkPipelineDepthStencilStateCreateInfo depthStencilState = vks::initializers::pipelineDepthStencilStateCreateInfo(VK_TRUE, VK_TRUE, VK_COMPARE_OP_LESS_OR_EQUAL);
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VkPipelineViewportStateCreateInfo viewportState = vks::initializers::pipelineViewportStateCreateInfo(1, 1, 0);
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VkPipelineMultisampleStateCreateInfo multisampleState = vks::initializers::pipelineMultisampleStateCreateInfo(VK_SAMPLE_COUNT_1_BIT, 0);
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std::vector<VkDynamicState> dynamicStateEnables = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR, VK_DYNAMIC_STATE_LINE_WIDTH };
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VkPipelineDynamicStateCreateInfo dynamicState = vks::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables);
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VkPipelineTessellationStateCreateInfo tessellationState = vks::initializers::pipelineTessellationStateCreateInfo(3);
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// Load shaders
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std::array<VkPipelineShaderStageCreateInfo, 4> shaderStages;
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shaderStages[0] = loadShader(getShadersPath() + "displacement/base.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
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shaderStages[1] = loadShader(getShadersPath() + "displacement/base.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
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shaderStages[2] = loadShader(getShadersPath() + "displacement/displacement.tesc.spv", VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT);
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shaderStages[3] = loadShader(getShadersPath() + "displacement/displacement.tese.spv", VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT);
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VkGraphicsPipelineCreateInfo pipelineCI = vks::initializers::pipelineCreateInfo(pipelineLayout, renderPass);
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pipelineCI.pInputAssemblyState = &inputAssemblyState;
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pipelineCI.pRasterizationState = &rasterizationState;
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pipelineCI.pColorBlendState = &colorBlendState;
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pipelineCI.pMultisampleState = &multisampleState;
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pipelineCI.pViewportState = &viewportState;
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pipelineCI.pDepthStencilState = &depthStencilState;
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pipelineCI.pDynamicState = &dynamicState;
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pipelineCI.pTessellationState = &tessellationState;
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pipelineCI.stageCount = static_cast<uint32_t>(shaderStages.size());
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pipelineCI.pStages = shaderStages.data();
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pipelineCI.pVertexInputState = vkglTF::Vertex::getPipelineVertexInputState({ vkglTF::VertexComponent::Position, vkglTF::VertexComponent::Normal, vkglTF::VertexComponent::UV });
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// Tessellation pipelines
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// Solid pipeline
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VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.solid));
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if (deviceFeatures.fillModeNonSolid) {
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// Wireframe pipeline
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rasterizationState.polygonMode = VK_POLYGON_MODE_LINE;
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rasterizationState.cullMode = VK_CULL_MODE_NONE;
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VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.wireframe));
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}
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}
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// Prepare and initialize uniform buffer containing shader uniforms
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void prepareUniformBuffers()
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{
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// Tessellation evaluation shader uniform buffer
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VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &uniformBuffer, sizeof(UniformData)));
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// Map persistent
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VK_CHECK_RESULT(uniformBuffer.map());
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}
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void updateUniformBuffers()
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{
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uniformData.projection = camera.matrices.perspective;
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uniformData.modelView = camera.matrices.view;
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uniformData.lightPos.y = -0.5f - uniformData.tessStrength;
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// Tessellation control
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float savedLevel = uniformData.tessLevel;
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// If displacement is unchecked, we simply set the tessellation level to 1.0f, which disables tessellation
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if (!displacement) {
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uniformData.tessLevel = 1.0f;
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}
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memcpy(uniformBuffer.mapped, &uniformData, sizeof(UniformData));
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if (!displacement) {
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uniformData.tessLevel = savedLevel;
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}
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}
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void prepare()
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{
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VulkanExampleBase::prepare();
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loadAssets();
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prepareUniformBuffers();
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setupDescriptors();
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preparePipelines();
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buildCommandBuffers();
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prepared = true;
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}
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void draw()
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{
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VulkanExampleBase::prepareFrame();
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submitInfo.commandBufferCount = 1;
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submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
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VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
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VulkanExampleBase::submitFrame();
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}
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virtual void render()
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{
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if (!prepared)
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return;
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updateUniformBuffers();
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draw();
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}
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virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay)
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{
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if (overlay->header("Settings")) {
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if (overlay->checkBox("Tessellation displacement", &displacement)) {
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updateUniformBuffers();
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}
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if (overlay->inputFloat("Strength", &uniformData.tessStrength, 0.025f, 3)) {
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updateUniformBuffers();
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}
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if (overlay->inputFloat("Level", &uniformData.tessLevel, 0.5f, 2)) {
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updateUniformBuffers();
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}
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if (deviceFeatures.fillModeNonSolid) {
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if (overlay->checkBox("Splitscreen", &splitScreen)) {
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buildCommandBuffers();
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updateUniformBuffers();
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}
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}
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}
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}
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};
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VULKAN_EXAMPLE_MAIN()
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