Function loadMeshData

deps/physx/physx/source/geomutils/src/GuMeshFactory.cpp:135–466

}

static TriangleMeshData* loadMeshData(PxInputStream& stream)
{
	// Import header
	PxU32 version;
	bool mismatch;
	if(!readHeader('M', 'E', 'S', 'H', version, mismatch, stream))
		return NULL;

	PxU32 midphaseID = PxMeshMidPhase::eBVH33;	// Default before version 14
	if(version>=14)	// this refers to PX_MESH_VERSION
	{
		midphaseID = readDword(mismatch, stream);
	}

	// Check if old (incompatible) mesh format is loaded
	if (version <= 9) // this refers to PX_MESH_VERSION
	{
		Ps::getFoundation().error(PxErrorCode::eINTERNAL_ERROR, __FILE__, __LINE__, "Loading triangle mesh failed: "
			"Deprecated mesh cooking format. Please recook your mesh in a new cooking format.");
		PX_ALWAYS_ASSERT_MESSAGE("Obsolete cooked mesh found. Mesh version has been updated, please recook your meshes.");
		return NULL;
	}

	// Import serialization flags
	const PxU32 serialFlags = readDword(mismatch, stream);

	// Import misc values	
	if (version <= 12) // this refers to PX_MESH_VERSION
	{
		// convexEdgeThreshold was removed in 3.4.0
		readFloat(mismatch, stream);		
	}

	TriangleMeshData* data;
	if(midphaseID==PxMeshMidPhase::eBVH33)
		data = PX_NEW(RTreeTriangleData);
	else if(midphaseID==PxMeshMidPhase::eBVH34)
		data = PX_NEW(BV4TriangleData);
	else return NULL;

	// Import mesh
	PxVec3* verts = data->allocateVertices(readDword(mismatch, stream));
	const PxU32 nbTris = readDword(mismatch, stream);
	bool force32 = (serialFlags & (IMSF_8BIT_INDICES|IMSF_16BIT_INDICES)) == 0;

	//ML: this will allocate CPU triangle indices and GPU triangle indices if we have GRB data built
	void* tris = data->allocateTriangles(nbTris, force32, serialFlags & IMSF_GRB_DATA);

	stream.read(verts, sizeof(PxVec3)*data->mNbVertices);
	if(mismatch)
	{
		for(PxU32 i=0;i<data->mNbVertices;i++)
		{
			flip(verts[i].x);
			flip(verts[i].y);
			flip(verts[i].z);
		}
	}