/******************************************************************************
	libx42 - skinned vertex animation library
	Copyright (C) 2007 HermitWorks Entertainment Corporation

	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; either version 2 of the License, or (at your option)
	any later version.

	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.

	You should have received a copy of the GNU General Public License along
	with this program; if not, write to the
	
		Free Software Foundation, Inc.
		51 Franklin Street, Fifth Floor
		Boston, MA  02110-1301, USA.
******************************************************************************/

#include "local.h"

X42_EXPORT bool X42_CALL x42_CopyIndices_u16( u16 *oIdx, uint baseIdx, const x42data_t *x42, uint groupNum, x42opts_t *opts )
{
	uint i;

	const x42group_t *g;
	const x42index_t * RESTRICT idxs;
	u16 * RESTRICT out = oIdx;

	REF_PARAM( opts );

#ifndef LIBX42_NO_PARAM_VALIDATION
	demand_rf( oIdx != NULL, X42_ERR_BADPTR, "oIdx is NULL" );
	demand_rf( x42 != NULL, X42_ERR_BADPTR, "x42 is NULL" );
	demand_rf( x42_ValidateHeader( &x42->header ), X42_ERR_BADDATA, "invalid x42 header data" );
	demand_rf( groupNum < x42->header.numGroups, X42_ERR_OUTOFRANGE, "group number out of range" );
#endif

	g = x42->groups + groupNum;

	if( g->firstIndex == X42_NO_INDICES )
	{
		//implicit vertices
		for( i = 0; i < g->numElems; i++ )
			out[i] = (u16)(baseIdx + i);

		return true;
	}

	idxs = x42->indices + g->firstIndex;

	if( baseIdx == 0 )
	{
		memcpy( out, idxs, sizeof( short ) * g->numElems );
		return true;
	}

	for( i = 0; i < g->numElems; i++ )
		out[i] = (u16)(baseIdx + idxs[i]);

	return true;
}

X42_EXPORT bool X42_CALL x42_CopyIndices_u32( u32 *oIdx, uint baseIdx, const x42data_t *x42, uint groupNum, x42opts_t *opts )
{
	uint i;

	const x42group_t *g;
	const x42index_t * RESTRICT idxs;
	u32 * RESTRICT out = oIdx;

	REF_PARAM( opts );

#ifndef LIBX42_NO_PARAM_VALIDATION
	demand_rf( oIdx != NULL, X42_ERR_BADPTR, "oIdx is NULL" );
	demand_rf( x42 != NULL, X42_ERR_BADPTR, "x42 is NULL" );
	demand_rf( x42_ValidateHeader( &x42->header ), X42_ERR_BADDATA, "invalid x42 header data" );
	demand_rf( groupNum < x42->header.numGroups, X42_ERR_OUTOFRANGE, "group number out of range" );
#endif

	g = x42->groups + groupNum;

	if( g->firstIndex == X42_NO_INDICES )
	{
		//implicit vertices
		for( i = 0; i < g->numElems; i++ )
			out[i] = baseIdx + i;

		return true;
	}

	idxs = x42->indices + g->firstIndex;

	for( i = 0; i < g->numElems; i++ )
		out[i] = baseIdx + idxs[i];

	return true;
}