initial commit, 4.5 stable

thirdparty/jolt_physics/Jolt/Physics/Body/BodyAccess.h

@@ -0,0 +1,68 @@
+// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
+// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#ifdef JPH_ENABLE_ASSERTS
+
+JPH_NAMESPACE_BEGIN
+
+class JPH_EXPORT BodyAccess
+{
+public:
+	/// Access rules, used to detect race conditions during simulation
+	enum class EAccess : uint8
+	{
+		None		= 0,
+		Read		= 1,
+		ReadWrite	= 3,
+	};
+
+	/// Grant a scope specific access rights on the current thread
+	class Grant
+	{
+	public:
+		inline							Grant(EAccess inVelocity, EAccess inPosition)
+		{
+			EAccess &velocity = sVelocityAccess();
+			EAccess &position = sPositionAccess();
+
+			JPH_ASSERT(velocity == EAccess::ReadWrite);
+			JPH_ASSERT(position == EAccess::ReadWrite);
+
+			velocity = inVelocity;
+			position = inPosition;
+		}
+
+		inline							~Grant()
+		{
+			sVelocityAccess() = EAccess::ReadWrite;
+			sPositionAccess() = EAccess::ReadWrite;
+		}
+	};
+
+	/// Check if we have permission
+	static inline bool					sCheckRights(EAccess inRights, EAccess inDesiredRights)
+	{
+		return (uint8(inRights) & uint8(inDesiredRights)) == uint8(inDesiredRights);
+	}
+
+	/// Access to read/write velocities
+	static inline EAccess &				sVelocityAccess()
+	{
+		static thread_local EAccess sAccess = BodyAccess::EAccess::ReadWrite;
+		return sAccess;
+	}
+
+	/// Access to read/write positions
+	static inline EAccess &				sPositionAccess()
+	{
+		static thread_local EAccess sAccess = BodyAccess::EAccess::ReadWrite;
+		return sAccess;
+	}
+};
+
+JPH_NAMESPACE_END
+
+#endif // JPH_ENABLE_ASSERTS