Renderer: Add RenderPassCache

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>