From 8045b8ba04aae39a4cf9733e72413f648b6ebe2b Mon Sep 17 00:00:00 2001
From: tylermurphy534 <tylermurphy534@gmail.com>
Date: Sun, 18 Sep 2022 21:20:51 -0400
Subject: stanford dragon rendering

---
 engine/xe_descriptors.cpp | 183 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 engine/xe_descriptors.cpp

(limited to 'engine/xe_descriptors.cpp')

diff --git a/engine/xe_descriptors.cpp b/engine/xe_descriptors.cpp
new file mode 100644
index 0000000..ef6dc2c
--- /dev/null
+++ b/engine/xe_descriptors.cpp
@@ -0,0 +1,183 @@
+#include "xe_descriptors.hpp"
+
+#include <cassert>
+#include <stdexcept>
+
+namespace xe {
+
+XeDescriptorSetLayout::Builder &XeDescriptorSetLayout::Builder::addBinding(
+    uint32_t binding,
+    VkDescriptorType descriptorType,
+    VkShaderStageFlags stageFlags,
+    uint32_t count) {
+  assert(bindings.count(binding) == 0 && "Binding already in use");
+  VkDescriptorSetLayoutBinding layoutBinding{};
+  layoutBinding.binding = binding;
+  layoutBinding.descriptorType = descriptorType;
+  layoutBinding.descriptorCount = count;
+  layoutBinding.stageFlags = stageFlags;
+  bindings[binding] = layoutBinding;
+  return *this;
+}
+
+std::unique_ptr<XeDescriptorSetLayout> XeDescriptorSetLayout::Builder::build() const {
+  return std::make_unique<XeDescriptorSetLayout>(xeDevice, bindings);
+}
+
+XeDescriptorSetLayout::XeDescriptorSetLayout(
+    XeDevice &xeDevice, std::unordered_map<uint32_t, VkDescriptorSetLayoutBinding> bindings)
+    : xeDevice{xeDevice}, bindings{bindings} {
+  std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings{};
+  for (auto kv : bindings) {
+    setLayoutBindings.push_back(kv.second);
+  }
+
+  VkDescriptorSetLayoutCreateInfo descriptorSetLayoutInfo{};
+  descriptorSetLayoutInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
+  descriptorSetLayoutInfo.bindingCount = static_cast<uint32_t>(setLayoutBindings.size());
+  descriptorSetLayoutInfo.pBindings = setLayoutBindings.data();
+
+  if (vkCreateDescriptorSetLayout(
+          xeDevice.device(),
+          &descriptorSetLayoutInfo,
+          nullptr,
+          &descriptorSetLayout) != VK_SUCCESS) {
+    throw std::runtime_error("failed to create descriptor set layout!");
+  }
+}
+
+XeDescriptorSetLayout::~XeDescriptorSetLayout() {
+  vkDestroyDescriptorSetLayout(xeDevice.device(), descriptorSetLayout, nullptr);
+}
+
+XeDescriptorPool::Builder &XeDescriptorPool::Builder::addPoolSize(
+    VkDescriptorType descriptorType, uint32_t count) {
+  poolSizes.push_back({descriptorType, count});
+  return *this;
+}
+
+XeDescriptorPool::Builder &XeDescriptorPool::Builder::setPoolFlags(
+    VkDescriptorPoolCreateFlags flags) {
+  poolFlags = flags;
+  return *this;
+}
+XeDescriptorPool::Builder &XeDescriptorPool::Builder::setMaxSets(uint32_t count) {
+  maxSets = count;
+  return *this;
+}
+
+std::unique_ptr<XeDescriptorPool> XeDescriptorPool::Builder::build() const {
+  return std::make_unique<XeDescriptorPool>(xeDevice, maxSets, poolFlags, poolSizes);
+}
+
+XeDescriptorPool::XeDescriptorPool(
+    XeDevice &xeDevice,
+    uint32_t maxSets,
+    VkDescriptorPoolCreateFlags poolFlags,
+    const std::vector<VkDescriptorPoolSize> &poolSizes)
+    : xeDevice{xeDevice} {
+  VkDescriptorPoolCreateInfo descriptorPoolInfo{};
+  descriptorPoolInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
+  descriptorPoolInfo.poolSizeCount = static_cast<uint32_t>(poolSizes.size());
+  descriptorPoolInfo.pPoolSizes = poolSizes.data();
+  descriptorPoolInfo.maxSets = maxSets;
+  descriptorPoolInfo.flags = poolFlags;
+
+  if (vkCreateDescriptorPool(xeDevice.device(), &descriptorPoolInfo, nullptr, &descriptorPool) !=
+      VK_SUCCESS) {
+    throw std::runtime_error("failed to create descriptor pool!");
+  }
+}
+
+XeDescriptorPool::~XeDescriptorPool() {
+  vkDestroyDescriptorPool(xeDevice.device(), descriptorPool, nullptr);
+}
+
+bool XeDescriptorPool::allocateDescriptor(
+    const VkDescriptorSetLayout descriptorSetLayout, VkDescriptorSet &descriptor) const {
+  VkDescriptorSetAllocateInfo allocInfo{};
+  allocInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
+  allocInfo.descriptorPool = descriptorPool;
+  allocInfo.pSetLayouts = &descriptorSetLayout;
+  allocInfo.descriptorSetCount = 1;
+
+  if (vkAllocateDescriptorSets(xeDevice.device(), &allocInfo, &descriptor) != VK_SUCCESS) {
+    return false;
+  }
+  return true;
+}
+
+void XeDescriptorPool::freeDescriptors(std::vector<VkDescriptorSet> &descriptors) const {
+  vkFreeDescriptorSets(
+      xeDevice.device(),
+      descriptorPool,
+      static_cast<uint32_t>(descriptors.size()),
+      descriptors.data());
+}
+
+void XeDescriptorPool::resetPool() {
+  vkResetDescriptorPool(xeDevice.device(), descriptorPool, 0);
+}
+
+XeDescriptorWriter::XeDescriptorWriter(XeDescriptorSetLayout &setLayout, XeDescriptorPool &pool)
+    : setLayout{setLayout}, pool{pool} {}
+
+XeDescriptorWriter &XeDescriptorWriter::writeBuffer(
+    uint32_t binding, VkDescriptorBufferInfo *bufferInfo) {
+  assert(setLayout.bindings.count(binding) == 1 && "Layout does not contain specified binding");
+
+  auto &bindingDescription = setLayout.bindings[binding];
+
+  assert(
+      bindingDescription.descriptorCount == 1 &&
+      "Binding single descriptor info, but binding expects multiple");
+
+  VkWriteDescriptorSet write{};
+  write.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+  write.descriptorType = bindingDescription.descriptorType;
+  write.dstBinding = binding;
+  write.pBufferInfo = bufferInfo;
+  write.descriptorCount = 1;
+
+  writes.push_back(write);
+  return *this;
+}
+
+XeDescriptorWriter &XeDescriptorWriter::writeImage(
+    uint32_t binding, VkDescriptorImageInfo *imageInfo) {
+  assert(setLayout.bindings.count(binding) == 1 && "Layout does not contain specified binding");
+
+  auto &bindingDescription = setLayout.bindings[binding];
+
+  assert(
+      bindingDescription.descriptorCount == 1 &&
+      "Binding single descriptor info, but binding expects multiple");
+
+  VkWriteDescriptorSet write{};
+  write.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+  write.descriptorType = bindingDescription.descriptorType;
+  write.dstBinding = binding;
+  write.pImageInfo = imageInfo;
+  write.descriptorCount = 1;
+
+  writes.push_back(write);
+  return *this;
+}
+
+bool XeDescriptorWriter::build(VkDescriptorSet &set) {
+  bool success = pool.allocateDescriptor(setLayout.getDescriptorSetLayout(), set);
+  if (!success) {
+    return false;
+  }
+  overwrite(set);
+  return true;
+}
+
+void XeDescriptorWriter::overwrite(VkDescriptorSet &set) {
+  for (auto &write : writes) {
+    write.dstSet = set;
+  }
+  vkUpdateDescriptorSets(pool.xeDevice.device(), writes.size(), writes.data(), 0, nullptr);
+}
+
+}
\ No newline at end of file
-- 
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