Add code to allow for depth buffer query (Fixes #18)

openVulkanoCpp/Vulkan/DepthBufferQuery.hpp

@@ -0,0 +1,48 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "Math/Math.hpp"
+#include "Vulkan/Image.hpp"
+
+namespace OpenVulkano::Vulkan
+{
+	class Renderer;
+
+	class DepthBufferQuery final
+	{
+		Renderer& renderer;
+		vk::DeviceMemory memory;
+		vk::Buffer bufferDepth;
+		float* cpuDepthBuffer = nullptr;
+		Math::Vector2f depthQueryCoordinates = { 0.5f, 0.5f };
+		bool copyDepthBuffer = true;
+		
+		vk::Offset3D GetCopyOffset() const;
+
+	public:
+		DepthBufferQuery(Renderer& renderer): renderer(renderer) {}
+
+		~DepthBufferQuery() { if (cpuDepthBuffer != nullptr) Close(); }
+
+		void Init();
+
+		void Close();
+
+		void Encode(vk::CommandBuffer& commandBuffer);
+		
+		void Resize(uint32_t width, uint32_t height);
+
+		float GetQueriedValue() const;
+
+		void SetQueryCoordinates(const Math::Vector2f& coords)
+		{
+			copyDepthBuffer = true;
+			depthQueryCoordinates = coords;
+		}
+	};
+}