Renderer: Add RenderPassCache

2021-07-17 21:11:19 +02:00
parent 8846eb4309
commit 7e4f624ca7
3 changed files with 290 additions and 0 deletions
--- a/src/Nazara/Renderer/RenderPassCache.cpp
+++ b/src/Nazara/Renderer/RenderPassCache.cpp
@@ -0,0 +1,159 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Renderer module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Renderer/RenderPassCache.hpp>
+#include <Nazara/Core/Algorithm.hpp>
+#include <Nazara/Renderer/RenderDevice.hpp>
+#include <Nazara/Renderer/Debug.hpp>
+
+namespace Nz
+{
+	const std::shared_ptr<RenderPass>& RenderPassCache::Get(const std::vector<RenderPass::Attachment>& attachments, const std::vector<RenderPass::SubpassDescription>& subpassDescriptions, const std::vector<RenderPass::SubpassDependency>& subpassDependencies) const
+	{
+		RenderPassData data;
+		data.attachmentCount = attachments.size();
+		data.attachments = attachments.data();
+
+		data.dependencyCount = subpassDependencies.size();
+		data.subpassDependencies = subpassDependencies.data();
+
+		data.descriptionCount = subpassDescriptions.size();
+		data.subpassDescriptions = subpassDescriptions.data();
+
+		auto it = m_renderPasses.find(data);
+		if (it != m_renderPasses.end())
+			return it->second;
+
+		std::shared_ptr<RenderPass> renderPass = m_device.InstantiateRenderPass(attachments, subpassDescriptions, subpassDependencies);
+
+		return m_renderPasses.emplace(renderPass, renderPass).first->second;
+	}
+
+	std::size_t RenderPassCache::Hasher::operator()(const RenderPassData& renderPassData) const
+	{
+		std::size_t seed = 0;
+		for (std::size_t i = 0; i < renderPassData.attachmentCount; ++i)
+		{
+			const auto& attachment = renderPassData.attachments[i];
+
+			HashCombine(seed, attachment.format);
+			HashCombine(seed, attachment.loadOp);
+			HashCombine(seed, attachment.stencilLoadOp);
+			HashCombine(seed, attachment.storeOp);
+			HashCombine(seed, attachment.stencilStoreOp);
+			HashCombine(seed, attachment.initialLayout);
+			HashCombine(seed, attachment.finalLayout);
+		}
+
+		for (std::size_t i = 0; i < renderPassData.descriptionCount; ++i)
+		{
+			const auto& subpassDesc = renderPassData.subpassDescriptions[i];
+
+			auto CombineAttachment = [&](const RenderPass::AttachmentReference& attachmentReference)
+			{
+				HashCombine(seed, attachmentReference.attachmentIndex);
+				HashCombine(seed, attachmentReference.attachmentLayout);
+			};
+
+			for (const auto& colorAttachment : subpassDesc.colorAttachment)
+				CombineAttachment(colorAttachment);
+
+			for (const auto& inputAttachment : subpassDesc.inputAttachments)
+				CombineAttachment(inputAttachment);
+
+			if (subpassDesc.depthStencilAttachment)
+				CombineAttachment(*subpassDesc.depthStencilAttachment);
+
+			for (const auto& attachmentIndex : subpassDesc.preserveAttachments)
+				HashCombine(seed, attachmentIndex);
+		}
+
+		for (std::size_t i = 0; i < renderPassData.dependencyCount; ++i)
+		{
+			const auto& subpassDep = renderPassData.subpassDependencies[i];
+
+			HashCombine(seed, subpassDep.fromSubpassIndex);
+			HashCombine(seed, subpassDep.fromStages);
+			HashCombine(seed, subpassDep.fromAccessFlags);
+
+			HashCombine(seed, subpassDep.toSubpassIndex);
+			HashCombine(seed, subpassDep.toStages);
+			HashCombine(seed, subpassDep.toAccessFlags);
+
+			HashCombine(seed, subpassDep.tilable);
+		}
+
+		return seed;
+	}
+
+	bool RenderPassCache::EqualityChecker::operator()(const RenderPassData& lhs, const RenderPassData& rhs) const
+	{
+		if (lhs.attachmentCount != rhs.attachmentCount ||
+		    lhs.dependencyCount != rhs.dependencyCount ||
+			lhs.descriptionCount != rhs.descriptionCount)
+			return false;
+
+		for (std::size_t i = 0; i < lhs.attachmentCount; ++i)
+		{
+			const auto& lhsAttachment = lhs.attachments[i];
+			const auto& rhsAttachment = rhs.attachments[i];
+
+			if (lhsAttachment.format != rhsAttachment.format ||
+			    lhsAttachment.loadOp != rhsAttachment.loadOp ||
+			    lhsAttachment.stencilLoadOp != rhsAttachment.stencilLoadOp ||
+			    lhsAttachment.storeOp != rhsAttachment.storeOp ||
+			    lhsAttachment.stencilStoreOp != rhsAttachment.stencilStoreOp ||
+			    lhsAttachment.initialLayout != rhsAttachment.initialLayout ||
+			    lhsAttachment.finalLayout != rhsAttachment.finalLayout)
+				return false;
+		}
+
+		for (std::size_t i = 0; i < lhs.dependencyCount; ++i)
+		{
+			const auto& lhsDependency = lhs.subpassDependencies[i];
+			const auto& rhsDependency = rhs.subpassDependencies[i];
+
+			if (lhsDependency.fromSubpassIndex != rhsDependency.fromSubpassIndex ||
+			    lhsDependency.fromStages != rhsDependency.fromStages ||
+			    lhsDependency.fromAccessFlags != rhsDependency.fromAccessFlags ||
+			    lhsDependency.toSubpassIndex != rhsDependency.toSubpassIndex ||
+			    lhsDependency.toStages != rhsDependency.toStages ||
+			    lhsDependency.toAccessFlags != rhsDependency.toAccessFlags ||
+			    lhsDependency.tilable != rhsDependency.tilable)
+				return false;
+		}
+
+		for (std::size_t i = 0; i < lhs.descriptionCount; ++i)
+		{
+			const auto& lhsSubpassDesc = lhs.subpassDescriptions[i];
+			const auto& rhsSubpassDesc = rhs.subpassDescriptions[i];
+
+			auto CompareAttachments = [&](const RenderPass::AttachmentReference& lhsAttachmentReference, const RenderPass::AttachmentReference& rhsAttachmentReference)
+			{
+				if (lhsAttachmentReference.attachmentIndex != rhsAttachmentReference.attachmentIndex)
+					return false;
+
+				if (lhsAttachmentReference.attachmentLayout != rhsAttachmentReference.attachmentLayout)
+					return false;
+
+				return true;
+			};
+
+			if (std::equal(lhsSubpassDesc.colorAttachment.begin(), lhsSubpassDesc.colorAttachment.end(), rhsSubpassDesc.colorAttachment.begin(), CompareAttachments) &&
+			    !std::equal(lhsSubpassDesc.inputAttachments.begin(), lhsSubpassDesc.inputAttachments.end(), rhsSubpassDesc.inputAttachments.begin(), CompareAttachments))
+				return false;
+
+			if (lhsSubpassDesc.depthStencilAttachment.has_value() != rhsSubpassDesc.depthStencilAttachment.has_value())
+				return false;
+
+			if (lhsSubpassDesc.depthStencilAttachment.has_value() && CompareAttachments(*lhsSubpassDesc.depthStencilAttachment, *rhsSubpassDesc.depthStencilAttachment))
+				return false;
+
+			if (lhsSubpassDesc.preserveAttachments != rhsSubpassDesc.preserveAttachments)
+				return false;
+		}
+
+		return true;
+	}
+}