Add Vulkan Descriptor-Update batching

Allows multiple descriptor operations to be batched up and dispatched in
one API call rather than scattered through out the code base.

include/renderer_vk/vk_descriptor_update_batch.hpp

@@ -0,0 +1,62 @@
+#pragma once
+
+#include <memory>
+#include <optional>
+#include <variant>
+
+#include "helpers.hpp"
+#include "vk_api.hpp"
+
+namespace Vulkan {
+	// Implements a re-usable structure for batching up descriptor writes with a
+	// finite amount of space for both convenience and to reduce the overall amount
+	// of API calls to `vkUpdateDescriptorSets`
+	class DescriptorUpdateBatch {
+	  private:
+		const vk::Device device;
+
+		const usize descriptorWriteMax;
+		const usize descriptorCopyMax;
+
+		using DescriptorInfoUnion = std::variant<vk::DescriptorImageInfo, vk::DescriptorBufferInfo, vk::BufferView>;
+
+		// Todo: Maybe some kind of hash so that these structures can be re-used
+		// among descriptor writes.
+		std::unique_ptr<DescriptorInfoUnion[]> descriptorInfos;
+		std::unique_ptr<vk::WriteDescriptorSet[]> descriptorWrites;
+		std::unique_ptr<vk::CopyDescriptorSet[]> descriptorCopies;
+
+		usize descriptorWriteEnd = 0;
+		usize descriptorCopyEnd = 0;
+
+		DescriptorUpdateBatch(vk::Device device, usize descriptorWriteMax, usize descriptorCopyMax)
+			: device(device), descriptorWriteMax(descriptorWriteMax), descriptorCopyMax(descriptorCopyMax) {}
+
+	  public:
+		~DescriptorUpdateBatch() = default;
+
+		DescriptorUpdateBatch(DescriptorUpdateBatch&&) = default;
+
+		void flush();
+
+		void addImage(
+			vk::DescriptorSet targetDescriptor, u8 targetBinding, vk::ImageView imageView, vk::ImageLayout imageLayout = vk::ImageLayout::eGeneral
+		);
+		void addSampler(vk::DescriptorSet targetDescriptor, u8 targetBinding, vk::Sampler sampler);
+
+		void addImageSampler(
+			vk::DescriptorSet targetDescriptor, u8 targetBinding, vk::ImageView imageView, vk::Sampler sampler,
+			vk::ImageLayout imageLayout = vk::ImageLayout::eShaderReadOnlyOptimal
+		);
+		void addBuffer(
+			vk::DescriptorSet targetDescriptor, u8 targetBinding, vk::Buffer buffer, vk::DeviceSize offset, vk::DeviceSize size = VK_WHOLE_SIZE
+		);
+
+		void copyBinding(
+			vk::DescriptorSet sourceDescriptor, vk::DescriptorSet targetDescriptor, u8 sourceBinding, u8 targetBinding, u8 sourceArrayElement = 0,
+			u8 targetArrayElement = 0, u8 descriptorCount = 1
+		);
+
+		static std::optional<DescriptorUpdateBatch> create(vk::Device device, usize descriptorWriteMax = 256, usize descriptorCopyMax = 256);
+	};
+}  // namespace Vulkan