initial commit, 4.5 stable

thirdparty/jolt_physics/Jolt/Core/JobSystemSingleThreaded.h

@@ -0,0 +1,62 @@
+// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
+// SPDX-FileCopyrightText: 2023 Jorrit Rouwe
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <Jolt/Core/JobSystem.h>
+#include <Jolt/Core/FixedSizeFreeList.h>
+
+JPH_NAMESPACE_BEGIN
+
+/// Implementation of a JobSystem without threads, runs jobs as soon as they are added
+class JPH_EXPORT JobSystemSingleThreaded final : public JobSystem
+{
+public:
+	JPH_OVERRIDE_NEW_DELETE
+
+	/// Constructor
+							JobSystemSingleThreaded() = default;
+	explicit				JobSystemSingleThreaded(uint inMaxJobs)			{ Init(inMaxJobs); }
+
+	/// Initialize the job system
+	/// @param inMaxJobs Max number of jobs that can be allocated at any time
+	void					Init(uint inMaxJobs);
+
+	// See JobSystem
+	virtual int				GetMaxConcurrency() const override				{ return 1; }
+	virtual JobHandle		CreateJob(const char *inName, ColorArg inColor, const JobFunction &inJobFunction, uint32 inNumDependencies = 0) override;
+	virtual Barrier *		CreateBarrier() override;
+	virtual void			DestroyBarrier(Barrier *inBarrier) override;
+	virtual void			WaitForJobs(Barrier *inBarrier) override;
+
+protected:
+	// Dummy implementation of Barrier, all jobs are executed immediately
+	class BarrierImpl : public Barrier
+	{
+	public:
+		JPH_OVERRIDE_NEW_DELETE
+
+		// See Barrier
+		virtual void		AddJob(const JobHandle &inJob) override			{ /* We don't need to track jobs */ }
+		virtual void		AddJobs(const JobHandle *inHandles, uint inNumHandles) override { /* We don't need to track jobs */ }
+
+	protected:
+		/// Called by a Job to mark that it is finished
+		virtual void		OnJobFinished(Job *inJob) override				{ /* We don't need to track jobs */ }
+	};
+
+	// See JobSystem
+	virtual void			QueueJob(Job *inJob) override;
+	virtual void			QueueJobs(Job **inJobs, uint inNumJobs) override;
+	virtual void			FreeJob(Job *inJob) override;
+
+	/// Shared barrier since the barrier implementation does nothing
+	BarrierImpl				mDummyBarrier;
+
+	/// Array of jobs (fixed size)
+	using AvailableJobs = FixedSizeFreeList<Job>;
+	AvailableJobs			mJobs;
+};
+
+JPH_NAMESPACE_END