initial commit, 4.5 stable

thirdparty/jolt_physics/Jolt/Core/RTTI.cpp

@@ -0,0 +1,149 @@
+// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
+// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
+// SPDX-License-Identifier: MIT
+
+#include <Jolt/Jolt.h>
+
+#include <Jolt/Core/RTTI.h>
+#include <Jolt/Core/StringTools.h>
+
+JPH_NAMESPACE_BEGIN
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// RTTI
+//////////////////////////////////////////////////////////////////////////////////////////
+
+RTTI::RTTI(const char *inName, int inSize, pCreateObjectFunction inCreateObject, pDestructObjectFunction inDestructObject) :
+	mName(inName),
+	mSize(inSize),
+	mCreate(inCreateObject),
+	mDestruct(inDestructObject)
+{
+	JPH_ASSERT(inDestructObject != nullptr, "Object cannot be destructed");
+}
+
+RTTI::RTTI(const char *inName, int inSize, pCreateObjectFunction inCreateObject, pDestructObjectFunction inDestructObject, pCreateRTTIFunction inCreateRTTI) :
+	mName(inName),
+	mSize(inSize),
+	mCreate(inCreateObject),
+	mDestruct(inDestructObject)
+{
+	JPH_ASSERT(inDestructObject != nullptr, "Object cannot be destructed");
+
+	inCreateRTTI(*this);
+}
+
+int RTTI::GetBaseClassCount() const
+{
+	return (int)mBaseClasses.size();
+}
+
+const RTTI *RTTI::GetBaseClass(int inIdx) const
+{
+	return mBaseClasses[inIdx].mRTTI;
+}
+
+uint32 RTTI::GetHash() const
+{
+	// Perform diffusion step to get from 64 to 32 bits (see https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function)
+	uint64 hash = HashString(mName);
+	return (uint32)(hash ^ (hash >> 32));
+}
+
+void *RTTI::CreateObject() const
+{
+	return IsAbstract()? nullptr : mCreate();
+}
+
+void RTTI::DestructObject(void *inObject) const
+{
+	mDestruct(inObject);
+}
+
+void RTTI::AddBaseClass(const RTTI *inRTTI, int inOffset)
+{
+	JPH_ASSERT(inOffset >= 0 && inOffset < mSize, "Base class not contained in derived class");
+
+	// Add base class
+	BaseClass base;
+	base.mRTTI = inRTTI;
+	base.mOffset = inOffset;
+	mBaseClasses.push_back(base);
+
+#ifdef JPH_OBJECT_STREAM
+	// Add attributes of base class
+	for (const SerializableAttribute &a : inRTTI->mAttributes)
+		mAttributes.push_back(SerializableAttribute(a, inOffset));
+#endif // JPH_OBJECT_STREAM
+}
+
+bool RTTI::operator == (const RTTI &inRHS) const
+{
+	// Compare addresses
+	if (this == &inRHS)
+		return true;
+
+	// Check that the names differ (if that is the case we probably have two instances
+	// of the same attribute info across the program, probably the second is in a DLL)
+	JPH_ASSERT(strcmp(mName, inRHS.mName) != 0);
+	return false;
+}
+
+bool RTTI::IsKindOf(const RTTI *inRTTI) const
+{
+	// Check if this is the same type
+	if (this == inRTTI)
+		return true;
+
+	// Check all base classes
+	for (const BaseClass &b : mBaseClasses)
+		if (b.mRTTI->IsKindOf(inRTTI))
+			return true;
+
+	return false;
+}
+
+const void *RTTI::CastTo(const void *inObject, const RTTI *inRTTI) const
+{
+	JPH_ASSERT(inObject != nullptr);
+
+	// Check if this is the same type
+	if (this == inRTTI)
+		return inObject;
+
+	// Check all base classes
+	for (const BaseClass &b : mBaseClasses)
+	{
+		// Cast the pointer to the base class
+		const void *casted = (const void *)(((const uint8 *)inObject) + b.mOffset);
+
+		// Test base class
+		const void *rv = b.mRTTI->CastTo(casted, inRTTI);
+		if (rv != nullptr)
+			return rv;
+	}
+
+	// Not possible to cast
+	return nullptr;
+}
+
+#ifdef JPH_OBJECT_STREAM
+
+void RTTI::AddAttribute(const SerializableAttribute &inAttribute)
+{
+	mAttributes.push_back(inAttribute);
+}
+
+int RTTI::GetAttributeCount() const
+{
+	return (int)mAttributes.size();
+}
+
+const SerializableAttribute &RTTI::GetAttribute(int inIdx) const
+{
+	return mAttributes[inIdx];
+}
+
+#endif // JPH_OBJECT_STREAM
+
+JPH_NAMESPACE_END