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geometryshader.cpp
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geometryshader.cpp
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/*
* Vulkan Example - Geometry shader (vertex normal debugging)
*
* Copyright (C) 2016 by Sascha Willems - www.saschawillems.de
*
* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
*/
#include "vulkanexamplebase.h"
#include "VulkanglTFModel.h"
#define VERTEX_BUFFER_BIND_ID 0
#define ENABLE_VALIDATION false
class VulkanExample : public VulkanExampleBase
{
public:
bool displayNormals = true;
vkglTF::Model scene;
struct {
glm::mat4 projection;
glm::mat4 modelView;
} uboVS;
struct {
glm::mat4 projection;
glm::mat4 modelView;
glm::vec2 viewportDim;
} uboGS;
struct {
vks::Buffer VS;
vks::Buffer GS;
} uniformBuffers;
struct {
VkPipeline solid;
VkPipeline normals;
} pipelines;
VkPipelineLayout pipelineLayout;
VkDescriptorSet descriptorSet;
VkDescriptorSetLayout descriptorSetLayout;
VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
{
title = "Geometry shader normal debugging";
camera.type = Camera::CameraType::lookat;
camera.setPosition(glm::vec3(0.0f, 0.0f, -1.0f));
camera.setRotation(glm::vec3(0.0f, -25.0f, 0.0f));
camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 128.0f);
}
~VulkanExample()
{
// Clean up used Vulkan resources
// Note : Inherited destructor cleans up resources stored in base class
vkDestroyPipeline(device, pipelines.solid, nullptr);
vkDestroyPipeline(device, pipelines.normals, nullptr);
vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
uniformBuffers.GS.destroy();
uniformBuffers.VS.destroy();
}
// Enable physical device features required for this example
virtual void getEnabledFeatures()
{
// Geometry shader support is required for this example
if (deviceFeatures.geometryShader) {
enabledFeatures.geometryShader = VK_TRUE;
}
else {
vks::tools::exitFatal("Selected GPU does not support geometry shaders!", VK_ERROR_FEATURE_NOT_PRESENT);
}
}
void buildCommandBuffers()
{
VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
VkClearValue clearValues[2];
clearValues[0].color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
clearValues[1].depthStencil = { 1.0f, 0 };
VkRenderPassBeginInfo renderPassBeginInfo = vks::initializers::renderPassBeginInfo();
renderPassBeginInfo.renderPass = renderPass;
renderPassBeginInfo.renderArea.offset.x = 0;
renderPassBeginInfo.renderArea.offset.y = 0;
renderPassBeginInfo.renderArea.extent.width = width;
renderPassBeginInfo.renderArea.extent.height = height;
renderPassBeginInfo.clearValueCount = 2;
renderPassBeginInfo.pClearValues = clearValues;
for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
{
// Set target frame buffer
renderPassBeginInfo.framebuffer = frameBuffers[i];
VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
vkCmdBeginRenderPass(drawCmdBuffers[i], &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
VkViewport viewport = vks::initializers::viewport((float)width, (float)height, 0.0f, 1.0f
);
vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
VkRect2D scissor = vks::initializers::rect2D(width, height, 0, 0);
vkCmdSetScissor(drawCmdBuffers[i], 0, 1, &scissor);
vkCmdSetLineWidth(drawCmdBuffers[i], 1.0f);
vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSet, 0, NULL);
VkDeviceSize offsets[1] = { 0 };
// Solid shading
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.solid);
scene.draw(drawCmdBuffers[i]);
// Normal debugging
if (displayNormals)
{
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.normals);
scene.draw(drawCmdBuffers[i]);
}
drawUI(drawCmdBuffers[i]);
vkCmdEndRenderPass(drawCmdBuffers[i]);
VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
}
}
void loadAssets()
{
scene.loadFromFile(getAssetPath() + "models/suzanne.gltf", vulkanDevice, queue, vkglTF::FileLoadingFlags::PreTransformVertices | vkglTF::FileLoadingFlags::PreMultiplyVertexColors | vkglTF::FileLoadingFlags::FlipY);
}
void setupDescriptorPool()
{
// Example uses two ubos
std::vector<VkDescriptorPoolSize> poolSizes =
{
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2),
};
VkDescriptorPoolCreateInfo descriptorPoolInfo =
vks::initializers::descriptorPoolCreateInfo(
poolSizes.size(),
poolSizes.data(),
2);
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
}
void setupDescriptorSetLayout()
{
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings =
{
// Binding 0 : Vertex shader ubo
vks::initializers::descriptorSetLayoutBinding(
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
VK_SHADER_STAGE_VERTEX_BIT,
0),
// Binding 1 : Geometry shader ubo
vks::initializers::descriptorSetLayoutBinding(
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
VK_SHADER_STAGE_GEOMETRY_BIT,
1)
};
VkDescriptorSetLayoutCreateInfo descriptorLayout =
vks::initializers::descriptorSetLayoutCreateInfo(
setLayoutBindings.data(),
setLayoutBindings.size());
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayout));
VkPipelineLayoutCreateInfo pPipelineLayoutCreateInfo =
vks::initializers::pipelineLayoutCreateInfo(
&descriptorSetLayout,
1);
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pPipelineLayoutCreateInfo, nullptr, &pipelineLayout));
}
void setupDescriptorSet()
{
VkDescriptorSetAllocateInfo allocInfo =
vks::initializers::descriptorSetAllocateInfo(
descriptorPool,
&descriptorSetLayout,
1);
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSet));
std::vector<VkWriteDescriptorSet> writeDescriptorSets =
{
// Binding 0 : Vertex shader ubo
vks::initializers::writeDescriptorSet(
descriptorSet,
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
0,
&uniformBuffers.VS.descriptor),
// Binding 1 : Geometry shader ubo
vks::initializers::writeDescriptorSet(
descriptorSet,
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
1,
&uniformBuffers.GS.descriptor)
};
vkUpdateDescriptorSets(device, writeDescriptorSets.size(), writeDescriptorSets.data(), 0, NULL);
}
void preparePipelines()
{
VkPipelineInputAssemblyStateCreateInfo inputAssemblyState = vks::initializers::pipelineInputAssemblyStateCreateInfo(VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, 0, VK_FALSE);
VkPipelineRasterizationStateCreateInfo rasterizationState = vks::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_NONE, VK_FRONT_FACE_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, 0);
// Tessellation pipeline
std::array<VkPipelineShaderStageCreateInfo, 3> shaderStages;
shaderStages[0] = loadShader(getShadersPath() + "geometryshader/base.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getShadersPath() + "geometryshader/base.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
shaderStages[2] = loadShader(getShadersPath() + "geometryshader/normaldebug.geom.spv", VK_SHADER_STAGE_GEOMETRY_BIT);
VkGraphicsPipelineCreateInfo pipelineCI = vks::initializers::pipelineCreateInfo(pipelineLayout, renderPass, 0);
pipelineCI.pInputAssemblyState = &inputAssemblyState;
pipelineCI.pRasterizationState = &rasterizationState;
pipelineCI.pColorBlendState = &colorBlendState;
pipelineCI.pMultisampleState = &multisampleState;
pipelineCI.pViewportState = &viewportState;
pipelineCI.pDepthStencilState = &depthStencilState;
pipelineCI.pDynamicState = &dynamicState;
pipelineCI.stageCount = shaderStages.size();
pipelineCI.pStages = shaderStages.data();
pipelineCI.renderPass = renderPass;
pipelineCI.pVertexInputState = vkglTF::Vertex::getPipelineVertexInputState({ vkglTF::VertexComponent::Position, vkglTF::VertexComponent::Normal, vkglTF::VertexComponent::Color });
// Normal debugging pipeline
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.normals));
// Solid rendering pipeline
shaderStages[0] = loadShader(getShadersPath() + "geometryshader/mesh.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getShadersPath() + "geometryshader/mesh.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
pipelineCI.stageCount = 2;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.solid));
}
// Prepare and initialize uniform buffer containing shader uniforms
void prepareUniformBuffers()
{
// Vertex shader uniform buffer block
VK_CHECK_RESULT(vulkanDevice->createBuffer(
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
&uniformBuffers.VS,
sizeof(uboVS)));
// Geometry shader uniform buffer block
VK_CHECK_RESULT(vulkanDevice->createBuffer(
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
&uniformBuffers.GS,
sizeof(uboGS)));
// Map persistent
VK_CHECK_RESULT(uniformBuffers.VS.map());
VK_CHECK_RESULT(uniformBuffers.GS.map());
updateUniformBuffers();
}
void updateUniformBuffers()
{
// Vertex shader
uboVS.projection = camera.matrices.perspective;
uboVS.modelView = camera.matrices.view;
memcpy(uniformBuffers.VS.mapped, &uboVS, sizeof(uboVS));
// Geometry shader
uboGS.projection = camera.matrices.perspective;
uboGS.modelView = camera.matrices.view;
uboGS.viewportDim = glm::vec2(width, height);
memcpy(uniformBuffers.GS.mapped, &uboGS, sizeof(uboGS));
}
void draw()
{
VulkanExampleBase::prepareFrame();
// Command buffer to be submitted to the queue
submitInfo.commandBufferCount = 1;
submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
// Submit to queue
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
VulkanExampleBase::submitFrame();
}
void prepare()
{
VulkanExampleBase::prepare();
loadAssets();
prepareUniformBuffers();
setupDescriptorSetLayout();
preparePipelines();
setupDescriptorPool();
setupDescriptorSet();
buildCommandBuffers();
prepared = true;
}
virtual void render()
{
if (!prepared)
return;
draw();
}
virtual void viewChanged()
{
updateUniformBuffers();
}
virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay)
{
if (overlay->header("Settings")) {
if (overlay->checkBox("Display normals", &displayNormals)) {
buildCommandBuffers();
}
}
}
};
VULKAN_EXAMPLE_MAIN()