//##########################################################################
//#                                                                        #
//#                              CLOUDCOMPARE                              #
//#                                                                        #
//#  This program is free software; you can redistribute it and/or modify  #
//#  it under the terms of the GNU General Public License as published by  #
//#  the Free Software Foundation; version 2 or later of the License.      #
//#                                                                        #
//#  This program is distributed in the hope that it will be useful,       #
//#  but WITHOUT ANY WARRANTY; without even the implied warranty of        #
//#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          #
//#  GNU General Public License for more details.                          #
//#                                                                        #
//#          COPYRIGHT: EDF R&D / TELECOM ParisTech (ENST-TSI)             #
//#                                                                        #
//##########################################################################

#include "ccMeshGroup.h"

//system
#include <assert.h>

void ccMeshGroup::drawMeOnly(CC_DRAW_CONTEXT& context)
{
	//does nothing
	return;
}

bool ccMeshGroup::toFile_MeOnly(QFile& out, short dataVersion) const
{
	ccLog::Error("[Mesh groups are not handled any more!");
	return false;
}

bool ccMeshGroup::fromFile_MeOnly(QFile& in, short dataVersion, int flags, LoadedIDMap& oldToNewIDMap)
{
	//Mesh groups are deprecated since version 2.9
	assert(dataVersion < 29);
	if (dataVersion >= 29)
		return false;

	if (!ccGenericMesh::fromFile_MeOnly(in, dataVersion, flags, oldToNewIDMap))
		return false;

	/*** we simply read the data as it was before, so as to be able to read the other entities from the file! ***/

	//as the associated cloud (=vertices) can't be saved directly (as it may be shared by multiple meshes)
	//we only store its unique ID (dataVersion>=20) --> we hope we will find it at loading time (i.e. this
	//is the responsibility of the caller to make sure that all dependencies are saved together)
	uint32_t vertUniqueID = 0;
	if (in.read((char*)&vertUniqueID, 4) < 0)
		return ReadError();
	//[DIRTY] WARNING: temporarily, we set the vertices unique ID in the 'm_associatedCloud' pointer!!!
	//*(uint32_t*)(&m_associatedCloud) = vertUniqueID;

	//per-triangle normals array (dataVersion>=20)
	{
		//as the associated normals array can't be saved directly (as it may be shared by multiple meshes)
		//we only store its unique ID (dataVersion>=20) --> we hope we will find it at loading time (i.e. this
		//is the responsibility of the caller to make sure that all dependencies are saved together)
		uint32_t normArrayID = 0;
		if (in.read((char*)&normArrayID, 4) < 0)
			return ReadError();
		//[DIRTY] WARNING: temporarily, we set the array unique ID in the 'm_triNormals' pointer!!!
		//*(uint32_t*)(&m_triNormals) = normArrayID;
	}

	//texture coordinates array (dataVersion>=20)
	{
		//as the associated texture coordinates array can't be saved directly (as it may be shared by multiple meshes)
		//we only store its unique ID (dataVersion>=20) --> we hope we will find it at loading time (i.e. this
		//is the responsibility of the caller to make sure that all dependencies are saved together)
		uint32_t texCoordArrayID = 0;
		if (in.read((char*)&texCoordArrayID, 4) < 0)
			return ReadError();
		//[DIRTY] WARNING: temporarily, we set the array unique ID in the 'm_texCoords' pointer!!!
		//*(uint32_t*)(&m_texCoords) = texCoordArrayID;
	}

	//materials
	{
		//as the associated materials can't be saved directly (as it may be shared by multiple meshes)
		//we only store its unique ID (dataVersion>=20) --> we hope we will find it at loading time (i.e. this
		//is the responsibility of the caller to make sure that all dependencies are saved together)
		uint32_t matSetID = 0;
		if (in.read((char*)&matSetID, 4) < 0)
			return ReadError();
		//[DIRTY] WARNING: temporarily, we set the array unique ID in the 'm_materials' pointer!!!
		//*(uint32_t*)(&m_materials) = matSetID;
	}

	return true;
}

short ccMeshGroup::minimumFileVersion_MeOnly() const
{
	return std::max(static_cast<short>(29), ccGenericMesh::minimumFileVersion_MeOnly());
}

