Renderer: Add RenderPassCache

include/Nazara/Renderer/RenderPassCache.hpp

@@ -0,0 +1,70 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Utility module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_RENDERPASSCACHE_HPP
+#define NAZARA_RENDERPASSCACHE_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Renderer/Config.hpp>
+#include <Nazara/Renderer/RenderPass.hpp>
+#include <memory>
+#include <variant>
+#include <unordered_map>
+
+namespace Nz
+{
+	class RenderDevice;
+
+	class NAZARA_RENDERER_API RenderPassCache
+	{
+		public:
+			inline RenderPassCache(RenderDevice& device);
+			RenderPassCache(const RenderPassCache&) = delete;
+			RenderPassCache(RenderPassCache&&) noexcept = default;
+			~RenderPassCache() = default;
+
+			const std::shared_ptr<RenderPass>& Get(const std::vector<RenderPass::Attachment>& attachments, const std::vector<RenderPass::SubpassDescription>& subpassDescriptions, const std::vector<RenderPass::SubpassDependency>& subpassDependencies) const;
+
+			RenderPassCache& operator=(const RenderPassCache&) = delete;
+			RenderPassCache& operator=(RenderPassCache&&) noexcept = default;
+
+		private:
+			struct RenderPassData
+			{
+				std::size_t attachmentCount;
+				std::size_t dependencyCount;
+				std::size_t descriptionCount;
+				const RenderPass::Attachment* attachments;
+				const RenderPass::SubpassDependency* subpassDependencies;
+				const RenderPass::SubpassDescription* subpassDescriptions;
+			};
+
+			using Key = std::variant<std::shared_ptr<RenderPass>, RenderPassData>;
+
+			struct Hasher
+			{
+				template<typename T> std::size_t operator()(const T& renderPass) const;
+				std::size_t operator()(const RenderPassData& renderPassData) const;
+			};
+
+			struct EqualityChecker
+			{
+				template<typename T1, typename T2> bool operator()(const T1& lhs, const T2& rhs) const;
+				bool operator()(const RenderPassData& lhs, const RenderPassData& rhs) const;
+			};
+
+			static inline auto ToRenderPassData(const Key& key);
+			static inline RenderPassData ToRenderPassData(const std::shared_ptr<RenderPass>& renderPass);
+			static inline const RenderPassData& ToRenderPassData(const RenderPassData& renderPassData);
+
+			mutable std::unordered_map<Key, std::shared_ptr<RenderPass>, Hasher, EqualityChecker> m_renderPasses;
+			RenderDevice& m_device;
+	};
+}
+
+#include <Nazara/Renderer/RenderPassCache.inl>
+
+#endif // NAZARA_RENDERPASS_HPP

include/Nazara/Renderer/RenderPassCache.inl

@@ -0,0 +1,61 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Utility module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Renderer/RenderPassCache.hpp>
+#include <cassert>
+#include <Nazara/Renderer/Debug.hpp>
+
+namespace Nz
+{
+	inline RenderPassCache::RenderPassCache(RenderDevice& device) :
+	m_device(device)
+	{
+	}
+
+	template<typename T>
+	std::size_t RenderPassCache::Hasher::operator()(const T& key) const
+	{
+		return operator()(ToRenderPassData(key));
+	}
+
+	template<typename T1, typename T2>
+	inline bool RenderPassCache::EqualityChecker::operator()(const T1& lhs, const T2& rhs) const
+	{
+		return operator()(ToRenderPassData(lhs), ToRenderPassData(rhs));
+	}
+
+	inline auto RenderPassCache::ToRenderPassData(const Key& key)
+	{
+		return std::visit([&](auto&& arg)
+		{
+			return ToRenderPassData(arg);
+		}, key);
+	}
+
+	inline auto RenderPassCache::ToRenderPassData(const std::shared_ptr<RenderPass>& renderPass) -> RenderPassData
+	{
+		const auto& attachments = renderPass->GetAttachments();
+		const auto& subpassDeps = renderPass->GetSubpassDependencies();
+		const auto& subpassDesc = renderPass->GetSubpassDescriptions();
+
+		RenderPassData data;
+		data.attachmentCount = attachments.size();
+		data.attachments = attachments.data();
+
+		data.dependencyCount = subpassDeps.size();
+		data.subpassDependencies = subpassDeps.data();
+
+		data.descriptionCount = subpassDesc.size();
+		data.subpassDescriptions = subpassDesc.data();
+
+		return data;
+	}
+
+	inline auto RenderPassCache::ToRenderPassData(const RenderPassData& renderPassData) -> const RenderPassData&
+	{
+		return renderPassData;
+	}
+}
+
+#include <Nazara/Renderer/DebugOff.hpp>