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pbribl.cpp
1420 lines (1228 loc) · 64.3 KB
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pbribl.cpp
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/*
* Vulkan Example - Physical based rendering with image based lighting
*
* This sample adds imaged based lighting from an environment map to the PBR equation
*
* Copyright (C) 2016-2023 by Sascha Willems - www.saschawillems.de
*
* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
*/
// For reference see http://blog.selfshadow.com/publications/s2013-shading-course/karis/s2013_pbs_epic_notes_v2.pdf
#include "vulkanexamplebase.h"
#include "VulkanglTFModel.h"
struct Material {
// Parameter block used as push constant block
struct PushBlock {
float roughness = 0.0f;
float metallic = 0.0f;
float specular = 0.0f;
float r, g, b;
} params;
std::string name;
Material() {};
Material(std::string n, glm::vec3 c) : name(n) {
params.r = c.r;
params.g = c.g;
params.b = c.b;
};
};
class VulkanExample : public VulkanExampleBase
{
public:
bool displaySkybox = true;
struct Textures {
vks::TextureCubeMap environmentCube;
// Generated at runtime
vks::Texture2D lutBrdf;
vks::TextureCubeMap irradianceCube;
vks::TextureCubeMap prefilteredCube;
} textures;
struct Meshes {
vkglTF::Model skybox;
std::vector<vkglTF::Model> objects;
int32_t objectIndex = 0;
} models;
struct {
vks::Buffer object;
vks::Buffer skybox;
vks::Buffer params;
} uniformBuffers;
struct UBOMatrices {
glm::mat4 projection;
glm::mat4 model;
glm::mat4 view;
glm::vec3 camPos;
} uboMatrices;
struct UBOParams {
glm::vec4 lights[4];
float exposure = 4.5f;
float gamma = 2.2f;
} uboParams;
struct {
VkPipeline skybox{ VK_NULL_HANDLE };
VkPipeline pbr{ VK_NULL_HANDLE };
} pipelines;
struct {
VkDescriptorSet object{ VK_NULL_HANDLE };
VkDescriptorSet skybox{ VK_NULL_HANDLE };
} descriptorSets;
VkPipelineLayout pipelineLayout{ VK_NULL_HANDLE };
VkDescriptorSetLayout descriptorSetLayout{ VK_NULL_HANDLE };
// Default materials to select from
std::vector<Material> materials;
int32_t materialIndex = 0;
std::vector<std::string> materialNames;
std::vector<std::string> objectNames;
VulkanExample() : VulkanExampleBase()
{
title = "PBR with image based lighting";
camera.type = Camera::CameraType::firstperson;
camera.movementSpeed = 4.0f;
camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 256.0f);
camera.rotationSpeed = 0.25f;
camera.setRotation({ -3.75f, 180.0f, 0.0f });
camera.setPosition({ 0.55f, 0.85f, 12.0f });
// Setup some default materials (source: https://seblagarde.wordpress.com/2011/08/17/feeding-a-physical-based-lighting-mode/)
materials.push_back(Material("Gold", glm::vec3(1.0f, 0.765557f, 0.336057f)));
materials.push_back(Material("Copper", glm::vec3(0.955008f, 0.637427f, 0.538163f)));
materials.push_back(Material("Chromium", glm::vec3(0.549585f, 0.556114f, 0.554256f)));
materials.push_back(Material("Nickel", glm::vec3(0.659777f, 0.608679f, 0.525649f)));
materials.push_back(Material("Titanium", glm::vec3(0.541931f, 0.496791f, 0.449419f)));
materials.push_back(Material("Cobalt", glm::vec3(0.662124f, 0.654864f, 0.633732f)));
materials.push_back(Material("Platinum", glm::vec3(0.672411f, 0.637331f, 0.585456f)));
// Testing materials
materials.push_back(Material("White", glm::vec3(1.0f)));
materials.push_back(Material("Dark", glm::vec3(0.1f)));
materials.push_back(Material("Black", glm::vec3(0.0f)));
materials.push_back(Material("Red", glm::vec3(1.0f, 0.0f, 0.0f)));
materials.push_back(Material("Blue", glm::vec3(0.0f, 0.0f, 1.0f)));
for (auto material : materials) {
materialNames.push_back(material.name);
}
objectNames = { "Sphere", "Teapot", "Torusknot", "Venus" };
materialIndex = 9;
}
~VulkanExample()
{
if (device) {
vkDestroyPipeline(device, pipelines.skybox, nullptr);
vkDestroyPipeline(device, pipelines.pbr, nullptr);
vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
uniformBuffers.object.destroy();
uniformBuffers.skybox.destroy();
uniformBuffers.params.destroy();
textures.environmentCube.destroy();
textures.irradianceCube.destroy();
textures.prefilteredCube.destroy();
textures.lutBrdf.destroy();
}
}
virtual void getEnabledFeatures()
{
if (deviceFeatures.samplerAnisotropy) {
enabledFeatures.samplerAnisotropy = VK_TRUE;
}
}
void buildCommandBuffers()
{
VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
VkClearValue clearValues[2];
clearValues[0].color = { { 0.1f, 0.1f, 0.1f, 1.0f } };
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 (size_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);
// Skybox
if (displaySkybox)
{
vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.skybox, 0, NULL);
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.skybox);
models.skybox.draw(drawCmdBuffers[i]);
}
// Objects
vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.object, 0, NULL);
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.pbr);
// Render a line of objects with the selected material and vary roughness/metallic material parameters
Material mat = materials[materialIndex];
const uint32_t objcount = 10;
for (uint32_t x = 0; x < objcount; x++) {
glm::vec3 pos = glm::vec3(float(x - (objcount / 2.0f)) * 2.15f, 0.0f, 0.0f);
mat.params.roughness = 1.0f-glm::clamp((float)x / (float)objcount, 0.005f, 1.0f);
mat.params.metallic = glm::clamp((float)x / (float)objcount, 0.005f, 1.0f);
vkCmdPushConstants(drawCmdBuffers[i], pipelineLayout, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(glm::vec3), &pos);
vkCmdPushConstants(drawCmdBuffers[i], pipelineLayout, VK_SHADER_STAGE_FRAGMENT_BIT, sizeof(glm::vec3), sizeof(Material::PushBlock), &mat);
models.objects[models.objectIndex].draw(drawCmdBuffers[i]);
}
drawUI(drawCmdBuffers[i]);
vkCmdEndRenderPass(drawCmdBuffers[i]);
VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
}
}
void loadAssets()
{
uint32_t glTFLoadingFlags = vkglTF::FileLoadingFlags::PreTransformVertices | vkglTF::FileLoadingFlags::FlipY;
// Skybox
models.skybox.loadFromFile(getAssetPath() + "models/cube.gltf", vulkanDevice, queue, glTFLoadingFlags);
// Objects
std::vector<std::string> filenames = { "sphere.gltf", "teapot.gltf", "torusknot.gltf", "venus.gltf" };
models.objects.resize(filenames.size());
for (size_t i = 0; i < filenames.size(); i++) {
models.objects[i].loadFromFile(getAssetPath() + "models/" + filenames[i], vulkanDevice, queue, glTFLoadingFlags);
}
// HDR cubemap
textures.environmentCube.loadFromFile(getAssetPath() + "textures/hdr/pisa_cube.ktx", VK_FORMAT_R16G16B16A16_SFLOAT, vulkanDevice, queue);
}
void setupDescriptors()
{
// Descriptor Pool
std::vector<VkDescriptorPoolSize> poolSizes = {
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 4),
vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 6)
};
VkDescriptorPoolCreateInfo descriptorPoolInfo = vks::initializers::descriptorPoolCreateInfo(poolSizes, 2);
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
// Descriptor set layout
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 0),
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_FRAGMENT_BIT, 1),
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 2),
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 3),
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 4),
};
VkDescriptorSetLayoutCreateInfo descriptorLayout = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings);
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayout));
// Descriptor sets
VkDescriptorSetAllocateInfo allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayout, 1);
// Objects
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.object));
std::vector<VkWriteDescriptorSet> writeDescriptorSets = {
vks::initializers::writeDescriptorSet(descriptorSets.object, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffers.object.descriptor),
vks::initializers::writeDescriptorSet(descriptorSets.object, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1, &uniformBuffers.params.descriptor),
vks::initializers::writeDescriptorSet(descriptorSets.object, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2, &textures.irradianceCube.descriptor),
vks::initializers::writeDescriptorSet(descriptorSets.object, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 3, &textures.lutBrdf.descriptor),
vks::initializers::writeDescriptorSet(descriptorSets.object, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 4, &textures.prefilteredCube.descriptor),
};
vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, NULL);
// Sky box
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.skybox));
writeDescriptorSets = {
vks::initializers::writeDescriptorSet(descriptorSets.skybox, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffers.skybox.descriptor),
vks::initializers::writeDescriptorSet(descriptorSets.skybox, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1, &uniformBuffers.params.descriptor),
vks::initializers::writeDescriptorSet(descriptorSets.skybox, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2, &textures.environmentCube.descriptor),
};
vkUpdateDescriptorSets(device, static_cast<uint32_t>(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_COUNTER_CLOCKWISE);
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_LESS_OR_EQUAL);
VkPipelineViewportStateCreateInfo viewportState =
vks::initializers::pipelineViewportStateCreateInfo(1, 1);
VkPipelineMultisampleStateCreateInfo multisampleState =
vks::initializers::pipelineMultisampleStateCreateInfo(VK_SAMPLE_COUNT_1_BIT);
std::vector<VkDynamicState> dynamicStateEnables = {
VK_DYNAMIC_STATE_VIEWPORT,
VK_DYNAMIC_STATE_SCISSOR
};
VkPipelineDynamicStateCreateInfo dynamicState =
vks::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables);
// Pipeline layout
VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayout, 1);
// Push constant ranges
std::vector<VkPushConstantRange> pushConstantRanges = {
vks::initializers::pushConstantRange(VK_SHADER_STAGE_VERTEX_BIT, sizeof(glm::vec3), 0),
vks::initializers::pushConstantRange(VK_SHADER_STAGE_FRAGMENT_BIT, sizeof(Material::PushBlock), sizeof(glm::vec3)),
};
pipelineLayoutCreateInfo.pushConstantRangeCount = 2;
pipelineLayoutCreateInfo.pPushConstantRanges = pushConstantRanges.data();
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCreateInfo, nullptr, &pipelineLayout));
std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;
// Pipelines
VkGraphicsPipelineCreateInfo pipelineCI = vks::initializers::pipelineCreateInfo(pipelineLayout, renderPass);
pipelineCI.pInputAssemblyState = &inputAssemblyState;
pipelineCI.pRasterizationState = &rasterizationState;
pipelineCI.pColorBlendState = &colorBlendState;
pipelineCI.pMultisampleState = &multisampleState;
pipelineCI.pViewportState = &viewportState;
pipelineCI.pDepthStencilState = &depthStencilState;
pipelineCI.pDynamicState = &dynamicState;
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 });
// Skybox pipeline (background cube)
shaderStages[0] = loadShader(getShadersPath() + "pbribl/skybox.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getShadersPath() + "pbribl/skybox.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.skybox));
// PBR pipeline
shaderStages[0] = loadShader(getShadersPath() + "pbribl/pbribl.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getShadersPath() + "pbribl/pbribl.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
// Enable depth test and write
depthStencilState.depthWriteEnable = VK_TRUE;
depthStencilState.depthTestEnable = VK_TRUE;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.pbr));
}
// Generate a BRDF integration map used as a look-up-table (stores roughness / NdotV)
void generateBRDFLUT()
{
auto tStart = std::chrono::high_resolution_clock::now();
const VkFormat format = VK_FORMAT_R16G16_SFLOAT; // R16G16 is supported pretty much everywhere
const int32_t dim = 512;
// Image
VkImageCreateInfo imageCI = vks::initializers::imageCreateInfo();
imageCI.imageType = VK_IMAGE_TYPE_2D;
imageCI.format = format;
imageCI.extent.width = dim;
imageCI.extent.height = dim;
imageCI.extent.depth = 1;
imageCI.mipLevels = 1;
imageCI.arrayLayers = 1;
imageCI.samples = VK_SAMPLE_COUNT_1_BIT;
imageCI.tiling = VK_IMAGE_TILING_OPTIMAL;
imageCI.usage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT;
VK_CHECK_RESULT(vkCreateImage(device, &imageCI, nullptr, &textures.lutBrdf.image));
VkMemoryAllocateInfo memAlloc = vks::initializers::memoryAllocateInfo();
VkMemoryRequirements memReqs;
vkGetImageMemoryRequirements(device, textures.lutBrdf.image, &memReqs);
memAlloc.allocationSize = memReqs.size;
memAlloc.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &textures.lutBrdf.deviceMemory));
VK_CHECK_RESULT(vkBindImageMemory(device, textures.lutBrdf.image, textures.lutBrdf.deviceMemory, 0));
// Image view
VkImageViewCreateInfo viewCI = vks::initializers::imageViewCreateInfo();
viewCI.viewType = VK_IMAGE_VIEW_TYPE_2D;
viewCI.format = format;
viewCI.subresourceRange = {};
viewCI.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
viewCI.subresourceRange.levelCount = 1;
viewCI.subresourceRange.layerCount = 1;
viewCI.image = textures.lutBrdf.image;
VK_CHECK_RESULT(vkCreateImageView(device, &viewCI, nullptr, &textures.lutBrdf.view));
// Sampler
VkSamplerCreateInfo samplerCI = vks::initializers::samplerCreateInfo();
samplerCI.magFilter = VK_FILTER_LINEAR;
samplerCI.minFilter = VK_FILTER_LINEAR;
samplerCI.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
samplerCI.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.minLod = 0.0f;
samplerCI.maxLod = 1.0f;
samplerCI.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE;
VK_CHECK_RESULT(vkCreateSampler(device, &samplerCI, nullptr, &textures.lutBrdf.sampler));
textures.lutBrdf.descriptor.imageView = textures.lutBrdf.view;
textures.lutBrdf.descriptor.sampler = textures.lutBrdf.sampler;
textures.lutBrdf.descriptor.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
textures.lutBrdf.device = vulkanDevice;
// FB, Att, RP, Pipe, etc.
VkAttachmentDescription attDesc = {};
// Color attachment
attDesc.format = format;
attDesc.samples = VK_SAMPLE_COUNT_1_BIT;
attDesc.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
attDesc.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
attDesc.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
attDesc.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
attDesc.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
attDesc.finalLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
VkAttachmentReference colorReference = { 0, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
VkSubpassDescription subpassDescription = {};
subpassDescription.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
subpassDescription.colorAttachmentCount = 1;
subpassDescription.pColorAttachments = &colorReference;
// Use subpass dependencies for layout transitions
std::array<VkSubpassDependency, 2> dependencies;
dependencies[0].srcSubpass = VK_SUBPASS_EXTERNAL;
dependencies[0].dstSubpass = 0;
dependencies[0].srcStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
dependencies[0].dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
dependencies[0].srcAccessMask = VK_ACCESS_MEMORY_READ_BIT;
dependencies[0].dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
dependencies[0].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
dependencies[1].srcSubpass = 0;
dependencies[1].dstSubpass = VK_SUBPASS_EXTERNAL;
dependencies[1].srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
dependencies[1].dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
dependencies[1].srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
dependencies[1].dstAccessMask = VK_ACCESS_MEMORY_READ_BIT;
dependencies[1].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
// Create the actual renderpass
VkRenderPassCreateInfo renderPassCI = vks::initializers::renderPassCreateInfo();
renderPassCI.attachmentCount = 1;
renderPassCI.pAttachments = &attDesc;
renderPassCI.subpassCount = 1;
renderPassCI.pSubpasses = &subpassDescription;
renderPassCI.dependencyCount = 2;
renderPassCI.pDependencies = dependencies.data();
VkRenderPass renderpass;
VK_CHECK_RESULT(vkCreateRenderPass(device, &renderPassCI, nullptr, &renderpass));
VkFramebufferCreateInfo framebufferCI = vks::initializers::framebufferCreateInfo();
framebufferCI.renderPass = renderpass;
framebufferCI.attachmentCount = 1;
framebufferCI.pAttachments = &textures.lutBrdf.view;
framebufferCI.width = dim;
framebufferCI.height = dim;
framebufferCI.layers = 1;
VkFramebuffer framebuffer;
VK_CHECK_RESULT(vkCreateFramebuffer(device, &framebufferCI, nullptr, &framebuffer));
// Descriptors
VkDescriptorSetLayout descriptorsetlayout;
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {};
VkDescriptorSetLayoutCreateInfo descriptorsetlayoutCI = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings);
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorsetlayoutCI, nullptr, &descriptorsetlayout));
// Descriptor Pool
std::vector<VkDescriptorPoolSize> poolSizes = { vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1) };
VkDescriptorPoolCreateInfo descriptorPoolCI = vks::initializers::descriptorPoolCreateInfo(poolSizes, 2);
VkDescriptorPool descriptorpool;
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolCI, nullptr, &descriptorpool));
// Descriptor sets
VkDescriptorSet descriptorset;
VkDescriptorSetAllocateInfo allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorpool, &descriptorsetlayout, 1);
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorset));
// Pipeline layout
VkPipelineLayout pipelinelayout;
VkPipelineLayoutCreateInfo pipelineLayoutCI = vks::initializers::pipelineLayoutCreateInfo(&descriptorsetlayout, 1);
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCI, nullptr, &pipelinelayout));
// Pipeline
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_COUNTER_CLOCKWISE);
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_LESS_OR_EQUAL);
VkPipelineViewportStateCreateInfo viewportState = vks::initializers::pipelineViewportStateCreateInfo(1, 1);
VkPipelineMultisampleStateCreateInfo multisampleState = vks::initializers::pipelineMultisampleStateCreateInfo(VK_SAMPLE_COUNT_1_BIT);
std::vector<VkDynamicState> dynamicStateEnables = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
VkPipelineDynamicStateCreateInfo dynamicState = vks::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables);
VkPipelineVertexInputStateCreateInfo emptyInputState = vks::initializers::pipelineVertexInputStateCreateInfo();
std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;
VkGraphicsPipelineCreateInfo pipelineCI = vks::initializers::pipelineCreateInfo(pipelinelayout, renderpass);
pipelineCI.pInputAssemblyState = &inputAssemblyState;
pipelineCI.pRasterizationState = &rasterizationState;
pipelineCI.pColorBlendState = &colorBlendState;
pipelineCI.pMultisampleState = &multisampleState;
pipelineCI.pViewportState = &viewportState;
pipelineCI.pDepthStencilState = &depthStencilState;
pipelineCI.pDynamicState = &dynamicState;
pipelineCI.stageCount = 2;
pipelineCI.pStages = shaderStages.data();
pipelineCI.pVertexInputState = &emptyInputState;
// Look-up-table (from BRDF) pipeline
shaderStages[0] = loadShader(getShadersPath() + "pbribl/genbrdflut.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getShadersPath() + "pbribl/genbrdflut.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
VkPipeline pipeline;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipeline));
// Render
VkClearValue clearValues[1];
clearValues[0].color = { { 0.0f, 0.0f, 0.0f, 1.0f } };
VkRenderPassBeginInfo renderPassBeginInfo = vks::initializers::renderPassBeginInfo();
renderPassBeginInfo.renderPass = renderpass;
renderPassBeginInfo.renderArea.extent.width = dim;
renderPassBeginInfo.renderArea.extent.height = dim;
renderPassBeginInfo.clearValueCount = 1;
renderPassBeginInfo.pClearValues = clearValues;
renderPassBeginInfo.framebuffer = framebuffer;
VkCommandBuffer cmdBuf = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
vkCmdBeginRenderPass(cmdBuf, &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
VkViewport viewport = vks::initializers::viewport((float)dim, (float)dim, 0.0f, 1.0f);
VkRect2D scissor = vks::initializers::rect2D(dim, dim, 0, 0);
vkCmdSetViewport(cmdBuf, 0, 1, &viewport);
vkCmdSetScissor(cmdBuf, 0, 1, &scissor);
vkCmdBindPipeline(cmdBuf, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline);
vkCmdDraw(cmdBuf, 3, 1, 0, 0);
vkCmdEndRenderPass(cmdBuf);
vulkanDevice->flushCommandBuffer(cmdBuf, queue);
vkQueueWaitIdle(queue);
vkDestroyPipeline(device, pipeline, nullptr);
vkDestroyPipelineLayout(device, pipelinelayout, nullptr);
vkDestroyRenderPass(device, renderpass, nullptr);
vkDestroyFramebuffer(device, framebuffer, nullptr);
vkDestroyDescriptorSetLayout(device, descriptorsetlayout, nullptr);
vkDestroyDescriptorPool(device, descriptorpool, nullptr);
auto tEnd = std::chrono::high_resolution_clock::now();
auto tDiff = std::chrono::duration<double, std::milli>(tEnd - tStart).count();
std::cout << "Generating BRDF LUT took " << tDiff << " ms" << std::endl;
}
// Generate an irradiance cube map from the environment cube map
void generateIrradianceCube()
{
auto tStart = std::chrono::high_resolution_clock::now();
const VkFormat format = VK_FORMAT_R32G32B32A32_SFLOAT;
const int32_t dim = 64;
const uint32_t numMips = static_cast<uint32_t>(floor(log2(dim))) + 1;
// Pre-filtered cube map
// Image
VkImageCreateInfo imageCI = vks::initializers::imageCreateInfo();
imageCI.imageType = VK_IMAGE_TYPE_2D;
imageCI.format = format;
imageCI.extent.width = dim;
imageCI.extent.height = dim;
imageCI.extent.depth = 1;
imageCI.mipLevels = numMips;
imageCI.arrayLayers = 6;
imageCI.samples = VK_SAMPLE_COUNT_1_BIT;
imageCI.tiling = VK_IMAGE_TILING_OPTIMAL;
imageCI.usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT;
imageCI.flags = VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT;
VK_CHECK_RESULT(vkCreateImage(device, &imageCI, nullptr, &textures.irradianceCube.image));
VkMemoryAllocateInfo memAlloc = vks::initializers::memoryAllocateInfo();
VkMemoryRequirements memReqs;
vkGetImageMemoryRequirements(device, textures.irradianceCube.image, &memReqs);
memAlloc.allocationSize = memReqs.size;
memAlloc.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &textures.irradianceCube.deviceMemory));
VK_CHECK_RESULT(vkBindImageMemory(device, textures.irradianceCube.image, textures.irradianceCube.deviceMemory, 0));
// Image view
VkImageViewCreateInfo viewCI = vks::initializers::imageViewCreateInfo();
viewCI.viewType = VK_IMAGE_VIEW_TYPE_CUBE;
viewCI.format = format;
viewCI.subresourceRange = {};
viewCI.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
viewCI.subresourceRange.levelCount = numMips;
viewCI.subresourceRange.layerCount = 6;
viewCI.image = textures.irradianceCube.image;
VK_CHECK_RESULT(vkCreateImageView(device, &viewCI, nullptr, &textures.irradianceCube.view));
// Sampler
VkSamplerCreateInfo samplerCI = vks::initializers::samplerCreateInfo();
samplerCI.magFilter = VK_FILTER_LINEAR;
samplerCI.minFilter = VK_FILTER_LINEAR;
samplerCI.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
samplerCI.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.minLod = 0.0f;
samplerCI.maxLod = static_cast<float>(numMips);
samplerCI.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE;
VK_CHECK_RESULT(vkCreateSampler(device, &samplerCI, nullptr, &textures.irradianceCube.sampler));
textures.irradianceCube.descriptor.imageView = textures.irradianceCube.view;
textures.irradianceCube.descriptor.sampler = textures.irradianceCube.sampler;
textures.irradianceCube.descriptor.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
textures.irradianceCube.device = vulkanDevice;
// FB, Att, RP, Pipe, etc.
VkAttachmentDescription attDesc = {};
// Color attachment
attDesc.format = format;
attDesc.samples = VK_SAMPLE_COUNT_1_BIT;
attDesc.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
attDesc.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
attDesc.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
attDesc.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
attDesc.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
attDesc.finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
VkAttachmentReference colorReference = { 0, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
VkSubpassDescription subpassDescription = {};
subpassDescription.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
subpassDescription.colorAttachmentCount = 1;
subpassDescription.pColorAttachments = &colorReference;
// Use subpass dependencies for layout transitions
std::array<VkSubpassDependency, 2> dependencies;
dependencies[0].srcSubpass = VK_SUBPASS_EXTERNAL;
dependencies[0].dstSubpass = 0;
dependencies[0].srcStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
dependencies[0].dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
dependencies[0].srcAccessMask = VK_ACCESS_MEMORY_READ_BIT;
dependencies[0].dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
dependencies[0].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
dependencies[1].srcSubpass = 0;
dependencies[1].dstSubpass = VK_SUBPASS_EXTERNAL;
dependencies[1].srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
dependencies[1].dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
dependencies[1].srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
dependencies[1].dstAccessMask = VK_ACCESS_MEMORY_READ_BIT;
dependencies[1].dependencyFlags = VK_DEPENDENCY_BY_REGION_BIT;
// Renderpass
VkRenderPassCreateInfo renderPassCI = vks::initializers::renderPassCreateInfo();
renderPassCI.attachmentCount = 1;
renderPassCI.pAttachments = &attDesc;
renderPassCI.subpassCount = 1;
renderPassCI.pSubpasses = &subpassDescription;
renderPassCI.dependencyCount = 2;
renderPassCI.pDependencies = dependencies.data();
VkRenderPass renderpass;
VK_CHECK_RESULT(vkCreateRenderPass(device, &renderPassCI, nullptr, &renderpass));
struct {
VkImage image;
VkImageView view;
VkDeviceMemory memory;
VkFramebuffer framebuffer;
} offscreen;
// Offscreen framebuffer
{
// Color attachment
VkImageCreateInfo imageCreateInfo = vks::initializers::imageCreateInfo();
imageCreateInfo.imageType = VK_IMAGE_TYPE_2D;
imageCreateInfo.format = format;
imageCreateInfo.extent.width = dim;
imageCreateInfo.extent.height = dim;
imageCreateInfo.extent.depth = 1;
imageCreateInfo.mipLevels = 1;
imageCreateInfo.arrayLayers = 1;
imageCreateInfo.samples = VK_SAMPLE_COUNT_1_BIT;
imageCreateInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
imageCreateInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
imageCreateInfo.usage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
imageCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
VK_CHECK_RESULT(vkCreateImage(device, &imageCreateInfo, nullptr, &offscreen.image));
VkMemoryAllocateInfo memAlloc = vks::initializers::memoryAllocateInfo();
VkMemoryRequirements memReqs;
vkGetImageMemoryRequirements(device, offscreen.image, &memReqs);
memAlloc.allocationSize = memReqs.size;
memAlloc.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &offscreen.memory));
VK_CHECK_RESULT(vkBindImageMemory(device, offscreen.image, offscreen.memory, 0));
VkImageViewCreateInfo colorImageView = vks::initializers::imageViewCreateInfo();
colorImageView.viewType = VK_IMAGE_VIEW_TYPE_2D;
colorImageView.format = format;
colorImageView.flags = 0;
colorImageView.subresourceRange = {};
colorImageView.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
colorImageView.subresourceRange.baseMipLevel = 0;
colorImageView.subresourceRange.levelCount = 1;
colorImageView.subresourceRange.baseArrayLayer = 0;
colorImageView.subresourceRange.layerCount = 1;
colorImageView.image = offscreen.image;
VK_CHECK_RESULT(vkCreateImageView(device, &colorImageView, nullptr, &offscreen.view));
VkFramebufferCreateInfo fbufCreateInfo = vks::initializers::framebufferCreateInfo();
fbufCreateInfo.renderPass = renderpass;
fbufCreateInfo.attachmentCount = 1;
fbufCreateInfo.pAttachments = &offscreen.view;
fbufCreateInfo.width = dim;
fbufCreateInfo.height = dim;
fbufCreateInfo.layers = 1;
VK_CHECK_RESULT(vkCreateFramebuffer(device, &fbufCreateInfo, nullptr, &offscreen.framebuffer));
VkCommandBuffer layoutCmd = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
vks::tools::setImageLayout(
layoutCmd,
offscreen.image,
VK_IMAGE_ASPECT_COLOR_BIT,
VK_IMAGE_LAYOUT_UNDEFINED,
VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
vulkanDevice->flushCommandBuffer(layoutCmd, queue, true);
}
// Descriptors
VkDescriptorSetLayout descriptorsetlayout;
std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 0),
};
VkDescriptorSetLayoutCreateInfo descriptorsetlayoutCI = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings);
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorsetlayoutCI, nullptr, &descriptorsetlayout));
// Descriptor Pool
std::vector<VkDescriptorPoolSize> poolSizes = { vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1) };
VkDescriptorPoolCreateInfo descriptorPoolCI = vks::initializers::descriptorPoolCreateInfo(poolSizes, 2);
VkDescriptorPool descriptorpool;
VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolCI, nullptr, &descriptorpool));
// Descriptor sets
VkDescriptorSet descriptorset;
VkDescriptorSetAllocateInfo allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorpool, &descriptorsetlayout, 1);
VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorset));
VkWriteDescriptorSet writeDescriptorSet = vks::initializers::writeDescriptorSet(descriptorset, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 0, &textures.environmentCube.descriptor);
vkUpdateDescriptorSets(device, 1, &writeDescriptorSet, 0, nullptr);
// Pipeline layout
struct PushBlock {
glm::mat4 mvp;
// Sampling deltas
float deltaPhi = (2.0f * float(M_PI)) / 180.0f;
float deltaTheta = (0.5f * float(M_PI)) / 64.0f;
} pushBlock;
VkPipelineLayout pipelinelayout;
std::vector<VkPushConstantRange> pushConstantRanges = {
vks::initializers::pushConstantRange(VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, sizeof(PushBlock), 0),
};
VkPipelineLayoutCreateInfo pipelineLayoutCI = vks::initializers::pipelineLayoutCreateInfo(&descriptorsetlayout, 1);
pipelineLayoutCI.pushConstantRangeCount = 1;
pipelineLayoutCI.pPushConstantRanges = pushConstantRanges.data();
VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCI, nullptr, &pipelinelayout));
// Pipeline
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_COUNTER_CLOCKWISE);
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_LESS_OR_EQUAL);
VkPipelineViewportStateCreateInfo viewportState = vks::initializers::pipelineViewportStateCreateInfo(1, 1);
VkPipelineMultisampleStateCreateInfo multisampleState = vks::initializers::pipelineMultisampleStateCreateInfo(VK_SAMPLE_COUNT_1_BIT);
std::vector<VkDynamicState> dynamicStateEnables = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
VkPipelineDynamicStateCreateInfo dynamicState = vks::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables);
std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;
VkGraphicsPipelineCreateInfo pipelineCI = vks::initializers::pipelineCreateInfo(pipelinelayout, renderpass);
pipelineCI.pInputAssemblyState = &inputAssemblyState;
pipelineCI.pRasterizationState = &rasterizationState;
pipelineCI.pColorBlendState = &colorBlendState;
pipelineCI.pMultisampleState = &multisampleState;
pipelineCI.pViewportState = &viewportState;
pipelineCI.pDepthStencilState = &depthStencilState;
pipelineCI.pDynamicState = &dynamicState;
pipelineCI.stageCount = 2;
pipelineCI.pStages = shaderStages.data();
pipelineCI.renderPass = renderpass;
pipelineCI.pVertexInputState = vkglTF::Vertex::getPipelineVertexInputState({ vkglTF::VertexComponent::Position, vkglTF::VertexComponent::Normal, vkglTF::VertexComponent::UV });
shaderStages[0] = loadShader(getShadersPath() + "pbribl/filtercube.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getShadersPath() + "pbribl/irradiancecube.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
VkPipeline pipeline;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipeline));
// Render
VkClearValue clearValues[1];
clearValues[0].color = { { 0.0f, 0.0f, 0.2f, 0.0f } };
VkRenderPassBeginInfo renderPassBeginInfo = vks::initializers::renderPassBeginInfo();
// Reuse render pass from example pass
renderPassBeginInfo.renderPass = renderpass;
renderPassBeginInfo.framebuffer = offscreen.framebuffer;
renderPassBeginInfo.renderArea.extent.width = dim;
renderPassBeginInfo.renderArea.extent.height = dim;
renderPassBeginInfo.clearValueCount = 1;
renderPassBeginInfo.pClearValues = clearValues;
std::vector<glm::mat4> matrices = {
// POSITIVE_X
glm::rotate(glm::rotate(glm::mat4(1.0f), glm::radians(90.0f), glm::vec3(0.0f, 1.0f, 0.0f)), glm::radians(180.0f), glm::vec3(1.0f, 0.0f, 0.0f)),
// NEGATIVE_X
glm::rotate(glm::rotate(glm::mat4(1.0f), glm::radians(-90.0f), glm::vec3(0.0f, 1.0f, 0.0f)), glm::radians(180.0f), glm::vec3(1.0f, 0.0f, 0.0f)),
// POSITIVE_Y
glm::rotate(glm::mat4(1.0f), glm::radians(-90.0f), glm::vec3(1.0f, 0.0f, 0.0f)),
// NEGATIVE_Y
glm::rotate(glm::mat4(1.0f), glm::radians(90.0f), glm::vec3(1.0f, 0.0f, 0.0f)),
// POSITIVE_Z
glm::rotate(glm::mat4(1.0f), glm::radians(180.0f), glm::vec3(1.0f, 0.0f, 0.0f)),
// NEGATIVE_Z
glm::rotate(glm::mat4(1.0f), glm::radians(180.0f), glm::vec3(0.0f, 0.0f, 1.0f)),
};
VkCommandBuffer cmdBuf = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
VkViewport viewport = vks::initializers::viewport((float)dim, (float)dim, 0.0f, 1.0f);
VkRect2D scissor = vks::initializers::rect2D(dim, dim, 0, 0);
vkCmdSetViewport(cmdBuf, 0, 1, &viewport);
vkCmdSetScissor(cmdBuf, 0, 1, &scissor);
VkImageSubresourceRange subresourceRange = {};
subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
subresourceRange.baseMipLevel = 0;
subresourceRange.levelCount = numMips;
subresourceRange.layerCount = 6;
// Change image layout for all cubemap faces to transfer destination
vks::tools::setImageLayout(
cmdBuf,
textures.irradianceCube.image,
VK_IMAGE_LAYOUT_UNDEFINED,
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
subresourceRange);
for (uint32_t m = 0; m < numMips; m++) {
for (uint32_t f = 0; f < 6; f++) {
viewport.width = static_cast<float>(dim * std::pow(0.5f, m));
viewport.height = static_cast<float>(dim * std::pow(0.5f, m));
vkCmdSetViewport(cmdBuf, 0, 1, &viewport);
// Render scene from cube face's point of view
vkCmdBeginRenderPass(cmdBuf, &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
// Update shader push constant block
pushBlock.mvp = glm::perspective((float)(M_PI / 2.0), 1.0f, 0.1f, 512.0f) * matrices[f];
vkCmdPushConstants(cmdBuf, pipelinelayout, VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 0, sizeof(PushBlock), &pushBlock);
vkCmdBindPipeline(cmdBuf, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline);
vkCmdBindDescriptorSets(cmdBuf, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelinelayout, 0, 1, &descriptorset, 0, NULL);
models.skybox.draw(cmdBuf);
vkCmdEndRenderPass(cmdBuf);
vks::tools::setImageLayout(
cmdBuf,
offscreen.image,
VK_IMAGE_ASPECT_COLOR_BIT,
VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);
// Copy region for transfer from framebuffer to cube face
VkImageCopy copyRegion = {};
copyRegion.srcSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
copyRegion.srcSubresource.baseArrayLayer = 0;
copyRegion.srcSubresource.mipLevel = 0;
copyRegion.srcSubresource.layerCount = 1;
copyRegion.srcOffset = { 0, 0, 0 };
copyRegion.dstSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
copyRegion.dstSubresource.baseArrayLayer = f;
copyRegion.dstSubresource.mipLevel = m;
copyRegion.dstSubresource.layerCount = 1;
copyRegion.dstOffset = { 0, 0, 0 };
copyRegion.extent.width = static_cast<uint32_t>(viewport.width);
copyRegion.extent.height = static_cast<uint32_t>(viewport.height);
copyRegion.extent.depth = 1;
vkCmdCopyImage(
cmdBuf,
offscreen.image,
VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
textures.irradianceCube.image,
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
1,
©Region);
// Transform framebuffer color attachment back
vks::tools::setImageLayout(
cmdBuf,
offscreen.image,
VK_IMAGE_ASPECT_COLOR_BIT,
VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
}
}
vks::tools::setImageLayout(
cmdBuf,
textures.irradianceCube.image,
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
subresourceRange);
vulkanDevice->flushCommandBuffer(cmdBuf, queue);
vkDestroyRenderPass(device, renderpass, nullptr);
vkDestroyFramebuffer(device, offscreen.framebuffer, nullptr);
vkFreeMemory(device, offscreen.memory, nullptr);
vkDestroyImageView(device, offscreen.view, nullptr);
vkDestroyImage(device, offscreen.image, nullptr);
vkDestroyDescriptorPool(device, descriptorpool, nullptr);
vkDestroyDescriptorSetLayout(device, descriptorsetlayout, nullptr);
vkDestroyPipeline(device, pipeline, nullptr);
vkDestroyPipelineLayout(device, pipelinelayout, nullptr);
auto tEnd = std::chrono::high_resolution_clock::now();
auto tDiff = std::chrono::duration<double, std::milli>(tEnd - tStart).count();
std::cout << "Generating irradiance cube with " << numMips << " mip levels took " << tDiff << " ms" << std::endl;
}
// Prefilter environment cubemap
// See https://placeholderart.wordpress.com/2015/07/28/implementation-notes-runtime-environment-map-filtering-for-image-based-lighting/
void generatePrefilteredCube()
{
auto tStart = std::chrono::high_resolution_clock::now();
const VkFormat format = VK_FORMAT_R16G16B16A16_SFLOAT;
const int32_t dim = 512;
const uint32_t numMips = static_cast<uint32_t>(floor(log2(dim))) + 1;
// Pre-filtered cube map
// Image
VkImageCreateInfo imageCI = vks::initializers::imageCreateInfo();
imageCI.imageType = VK_IMAGE_TYPE_2D;
imageCI.format = format;
imageCI.extent.width = dim;
imageCI.extent.height = dim;
imageCI.extent.depth = 1;
imageCI.mipLevels = numMips;
imageCI.arrayLayers = 6;
imageCI.samples = VK_SAMPLE_COUNT_1_BIT;
imageCI.tiling = VK_IMAGE_TILING_OPTIMAL;
imageCI.usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT;
imageCI.flags = VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT;
VK_CHECK_RESULT(vkCreateImage(device, &imageCI, nullptr, &textures.prefilteredCube.image));
VkMemoryAllocateInfo memAlloc = vks::initializers::memoryAllocateInfo();
VkMemoryRequirements memReqs;
vkGetImageMemoryRequirements(device, textures.prefilteredCube.image, &memReqs);
memAlloc.allocationSize = memReqs.size;
memAlloc.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &textures.prefilteredCube.deviceMemory));
VK_CHECK_RESULT(vkBindImageMemory(device, textures.prefilteredCube.image, textures.prefilteredCube.deviceMemory, 0));
// Image view
VkImageViewCreateInfo viewCI = vks::initializers::imageViewCreateInfo();
viewCI.viewType = VK_IMAGE_VIEW_TYPE_CUBE;
viewCI.format = format;
viewCI.subresourceRange = {};
viewCI.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
viewCI.subresourceRange.levelCount = numMips;
viewCI.subresourceRange.layerCount = 6;
viewCI.image = textures.prefilteredCube.image;
VK_CHECK_RESULT(vkCreateImageView(device, &viewCI, nullptr, &textures.prefilteredCube.view));
// Sampler
VkSamplerCreateInfo samplerCI = vks::initializers::samplerCreateInfo();
samplerCI.magFilter = VK_FILTER_LINEAR;
samplerCI.minFilter = VK_FILTER_LINEAR;
samplerCI.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
samplerCI.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
samplerCI.minLod = 0.0f;
samplerCI.maxLod = static_cast<float>(numMips);
samplerCI.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE;
VK_CHECK_RESULT(vkCreateSampler(device, &samplerCI, nullptr, &textures.prefilteredCube.sampler));
textures.prefilteredCube.descriptor.imageView = textures.prefilteredCube.view;
textures.prefilteredCube.descriptor.sampler = textures.prefilteredCube.sampler;
textures.prefilteredCube.descriptor.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
textures.prefilteredCube.device = vulkanDevice;
// FB, Att, RP, Pipe, etc.
VkAttachmentDescription attDesc = {};
// Color attachment
attDesc.format = format;
attDesc.samples = VK_SAMPLE_COUNT_1_BIT;
attDesc.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
attDesc.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
attDesc.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
attDesc.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
attDesc.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
attDesc.finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
VkAttachmentReference colorReference = { 0, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL };
VkSubpassDescription subpassDescription = {};