Latest chapter from vkguide but doesn't work yet.

vk_descriptors.h

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+#pragma once
+
+#include "vk_types.h"
+#include <vector>
+
+struct DescriptorLayoutBuilder {
+  std::vector<VkDescriptorSetLayoutBinding> bindings;
+
+  void add_binding(uint32_t binding, VkDescriptorType type);
+  void clear();
+
+  VkDescriptorSetLayout build(VkDevice device,
+      VkShaderStageFlags shaderStages,
+      void* pNext = nullptr,
+      VkDescriptorSetLayoutCreateFlags flags = 0);
+};
+
+struct DescriptorAllocator {
+
+  struct PoolSizeRatio {
+    VkDescriptorType type;
+    float ratio;
+  };
+
+  VkDescriptorPool pool;
+
+  void init_pool(VkDevice device, uint32_t maxSets,
+      std::span<PoolSizeRatio> poolRatios);
+
+  void clear_descriptors(VkDevice device);
+  void destroy_pool(VkDevice device);
+
+  VkDescriptorSet allocate(VkDevice device, VkDescriptorSetLayout layout);
+
+};