/******************************************************************************
	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"

static void copy_tc( const vec2_t * RESTRICT iTc, uint numVerts, x42memStream_t *oTc )
{
	uint i;

	for( i = 0; i < numVerts; i++ )
	{
		stream_emit2fv( oTc, iTc[i] );
	}
}

static void copy_cl_bgra( const rgba_t * RESTRICT iCl, uint numVerts, x42memStream_t *oCl )
{
	uint i;

	for( i = 0; i < numVerts; i++ )
	{
		const byte * RESTRICT cl = iCl[i];
		stream_emit4ub( oCl, cl[2], cl[1], cl[0], cl[3] );
	}
}

static void copy_cl_argb( const rgba_t * RESTRICT iCl, uint numVerts, x42memStream_t *oCl )
{
	uint i;

	for( i = 0; i < numVerts; i++ )
	{
		const byte * RESTRICT cl = iCl[i];
		stream_emit4ub( oCl, cl[3], cl[0], cl[1], cl[2] );
	}
}

static void copy_cl_rgba( const rgba_t * RESTRICT iCl, uint numVerts, x42memStream_t *oCl )
{
	uint i;

	for( i = 0; i < numVerts; i++ )
	{
		stream_emit4ubv( oCl, iCl[i] );
	}
}

X42_EXPORT bool X42_CALL x42_CopyVertAttribs( x42memStream_t *oTc, x42memStream_t *oCl, uint color_type,
	const x42data_t *x42, uint groupNum, x42opts_t *opts )
{
	const x42group_t *g;

	REF_PARAM( opts );

#ifndef LIBX42_NO_PARAM_VALIDATION
	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( !oTc && !oCl )
		//nothing to do
		return true;

	if( oTc )
		copy_tc( x42->vertTc + g->firstVert, g->numVerts, oTc );

	if( oCl )
	{
		switch( color_type )
		{
		case X42_COLOR_BGRA:
			copy_cl_bgra( x42->vertCl + g->firstVert, g->numVerts, oCl );
			break;

		case X42_COLOR_ARGB:
			copy_cl_argb( x42->vertCl + g->firstVert, g->numVerts, oCl );
			break;

		case X42_COLOR_RGBA:
			copy_cl_rgba( x42->vertCl + g->firstVert, g->numVerts, oCl );
			break;
			
		default:
			fail_rf( X42_ERR_BADPARAMS, "invalid color type" );
		}
	}

	return true;
}

#pragma warning( disable : 4206 )