Draft Vulkan DescriptorHeap

A utility class from a personal project for managing a heap of
descriptors of a particular layout.

Allows the display graphics pipeline to be successfully created,
satisfying its descriptor layout issues.

include/renderer_vk/vk_descriptor_heap.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <optional>
+#include <span>
+
+#include "helpers.hpp"
+#include "vk_api.hpp"
+
+namespace Vulkan {
+	// Implements a basic heap of descriptor sets given a layout of particular
+	// bindings. Create a descriptor set by providing a list of bindings and it will
+	// automatically create both the pool, layout, and maintail a heap of descriptor
+	// sets. Descriptor sets will be reused and recycled. Assume that newly
+	// allocated descriptor sets are in an undefined state.
+	class DescriptorHeap {
+	  private:
+		const vk::Device device;
+
+		vk::UniqueDescriptorPool descriptorPool;
+		vk::UniqueDescriptorSetLayout descriptorSetLayout;
+		std::vector<vk::UniqueDescriptorSet> descriptorSets;
+
+		std::vector<vk::DescriptorSetLayoutBinding> bindings;
+
+		std::vector<bool> allocationMap;
+
+		explicit DescriptorHeap(vk::Device device);
+
+	  public:
+		~DescriptorHeap() = default;
+
+		DescriptorHeap(DescriptorHeap&&) = default;
+
+		const vk::DescriptorPool& getDescriptorPool() const { return descriptorPool.get(); };
+
+		const vk::DescriptorSetLayout& getDescriptorSetLayout() const { return descriptorSetLayout.get(); };
+
+		const std::span<const vk::UniqueDescriptorSet> getDescriptorSets() const { return descriptorSets; };
+
+		std::span<const vk::DescriptorSetLayoutBinding> getBindings() const { return bindings; };
+
+		std::optional<vk::DescriptorSet> allocateDescriptorSet();
+		bool freeDescriptorSet(vk::DescriptorSet set);
+
+		static std::optional<DescriptorHeap> create(
+			vk::Device device, std::span<const vk::DescriptorSetLayoutBinding> bindings, u16 descriptorHeapCount = 1024
+		);
+	};
+}  // namespace Vulkan