/*
Copyright (C) 2003 Rice1964

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include "stdafx.h"

CNvTNTCombiner::CNvTNTCombiner()
{
	m_lastIndexTNT = 0;
}

int CNvTNTCombiner::FindCompiledMux( )
{
	for( uint32 i=0; i<m_vCompiledTNTSettings.size(); i++ )
	{
		if( m_vCompiledTNTSettings[i].dwMux0 == (*m_ppDecodedMux)->m_dwMux0 && m_vCompiledTNTSettings[i].dwMux1 == (*m_ppDecodedMux)->m_dwMux1 )
		{
			m_lastIndexTNT = i;
			return i;
		}
	}

	return -1;
}

bool isTex(uint32 val);
bool isComb(uint32 val);

int CNvTNTCombiner::ParseDecodedMux()
{
	TNT2CombinerSaveType res;
	res.numOfUnits = 2;

	(*m_ppDecodedMux)->To_AB_Add_CD_Format();

	for( int i=0; i<res.numOfUnits*2; i++ )	// Set combiner for each texture unit
	{
		// For each texture unit, set both RGB and Alpha channel
		// Keep in mind that the m_pDecodeMux has been reformated and simplified very well

		TNT2CombinerType &unit = res.units[i/2];
		TNT2CombType &comb = unit.Combs[i%2];

		CombinerFormatType type = (*m_ppDecodedMux)->splitType[i];
		N64CombinerType &m = (*m_ppDecodedMux)->m_n64Combiners[i];

		comb.arg0 = comb.arg1 = comb.arg2 = comb.arg3 = MUX_0;
		unit.ops[i%2] = 0x0104;	//Add;
		//Subtract

		switch( type )
		{
		case CM_FMT_TYPE_NOT_USED:
			comb.arg0 = MUX_COMBINED;
			comb.arg1 = MUX_1;
			comb.arg2 = MUX_0;
			comb.arg3 = MUX_1;
		case CM_FMT_TYPE_D:				// = A
			comb.arg0 = m.d;
			comb.arg1 = MUX_1;
			comb.arg2 = MUX_0;
			comb.arg3 = MUX_0;
			break;
		case CM_FMT_TYPE_A_ADD_D:			// = A+D
			comb.arg0 = m.a;
			comb.arg1 = MUX_1;
			comb.arg2 = m.d;
			comb.arg3 = MUX_1;
			if( isComb(m.d) )
			{
				swap(comb.arg0, comb.arg2);
				swap(comb.arg1, comb.arg3);
			}
			break;
		case CM_FMT_TYPE_A_SUB_B:			// = A-B
			comb.arg0 = m.a^MUX_COMPLEMENT;
			comb.arg1 = MUX_1;
			unit.ops[i%2] = GL_SUBTRACT_ARB;
			comb.arg2 = m.b;
			comb.arg3 = MUX_1;
			break;
		case CM_FMT_TYPE_A_MOD_C:			// = A*C
			comb.arg0 = m.a;
			comb.arg1 = m.c;
			comb.arg2 = MUX_0;
			comb.arg3 = MUX_0;
			break;
		case CM_FMT_TYPE_A_MOD_C_ADD_D:	// = A*C+D
			comb.arg0 = m.a;
			comb.arg1 = m.c;
			comb.arg2 = m.d;
			comb.arg3 = MUX_1;
			if( isComb(m.d) )
			{
				swap(comb.arg0, comb.arg2);
				swap(comb.arg1, comb.arg3);
			}
			break;
		case CM_FMT_TYPE_A_LERP_B_C:		// = (A-B)*C+B
			comb.arg0 = m.a;
			comb.arg1 = m.c;
			comb.arg2 = m.c^MUX_COMPLEMENT;
			comb.arg3 = m.b;
			if( isComb(m.b) )
			{
				swap(comb.arg0, comb.arg2);
				swap(comb.arg1, comb.arg3);
			}
			break;
		case CM_FMT_TYPE_A_SUB_B_ADD_D:	// = A-B+D
			// fix me, to use 2 texture units
			if( isTex(m.b) && isTex(m.d) )
			{
				comb.arg0 = m.a;
				comb.arg1 = m.b;
				comb.arg2 = m.d;
				comb.arg3 = MUX_1;
				if( isComb(m.d) )
				{
					swap(comb.arg0, comb.arg2);
					swap(comb.arg1, comb.arg3);
				}
			}
			else if( isTex(m.b) && !isComb(m.d) )
			{
				comb.arg0 = m.a^MUX_COMPLEMENT;
				comb.arg1 = MUX_1;
				comb.arg2 = m.b;
				comb.arg3 = MUX_1;
				unit.ops[i%2] = GL_SUBTRACT_ARB;
			}
			else if( !isTex(m.b) && isTex(m.d) )
			{
				comb.arg0 = m.a;
				comb.arg1 = MUX_1;
				comb.arg2 = m.d;
				comb.arg3 = MUX_1;
				if( isComb(m.d) )
				{
					swap(comb.arg0, comb.arg2);
					swap(comb.arg1, comb.arg3);
				}
			}
			else
			{
				comb.arg0 = m.a;
				comb.arg1 = m.b;
				comb.arg2 = m.d;
				comb.arg3 = MUX_1;
				if( isComb(m.d) )
				{
					swap(comb.arg0, comb.arg2);
					swap(comb.arg1, comb.arg3);
				}
			}
			break;
		case CM_FMT_TYPE_A_SUB_B_MOD_C:	// = (A-B)*C
			comb.arg0 = m.a^MUX_COMPLEMENT;
			comb.arg1 = m.c;
			comb.arg2 = m.c;
			comb.arg3 = m.b;
			unit.ops[i%2] = GL_SUBTRACT_ARB;
			break;
		case CM_FMT_TYPE_AB_ADD_CD:			// = AB+CD
			comb.arg0 = m.a;
			comb.arg1 = m.b;
			comb.arg2 = m.c;
			comb.arg3 = m.d;
			if( isComb(m.d) || isComb(m.c) )
			{
				swap(comb.arg0, comb.arg2);
				swap(comb.arg1, comb.arg3);
			}

			break;
		case CM_FMT_TYPE_AB_SUB_CD:			// = AB-CD
			comb.arg0 = m.a^MUX_COMPLEMENT;
			comb.arg1 = m.b;
			unit.ops[i%2] = GL_SUBTRACT_ARB;
			comb.arg2 = m.c;
			comb.arg3 = m.d;
			break;
		case CM_FMT_TYPE_A_B_C_D:			// = (A-B)*C+D
		default:
			if( !isComb(m.d) && !isTex(m.d) )
			{
				comb.arg0 = m.a^MUX_COMPLEMENT;
				comb.arg1 = m.c;
				unit.ops[i%2] = GL_SUBTRACT_ARB;
				comb.arg2 = m.c;
				comb.arg3 = m.b;
			}
			else if( !isComb(m.b) && !isTex(m.b) )
			{
				comb.arg0 = m.a;
				comb.arg1 = m.c;
				comb.arg2 = m.d;
				comb.arg3 = MUX_1;
				if( isComb(m.d) )
				{
					swap(comb.arg0, comb.arg2);
					swap(comb.arg1, comb.arg3);
				}
			}
			else if( !isComb(m.c) && !isTex(m.c) )
			{
				comb.arg0 = m.a;
				comb.arg1 = m.b;
				comb.arg2 = m.d;
				comb.arg3 = MUX_1;
				if( isComb(m.d) )
				{
					swap(comb.arg0, comb.arg2);
					swap(comb.arg1, comb.arg3);
				}
			}
			else
			{
				comb.arg0 = m.a;
				comb.arg1 = m.c;
				comb.arg2 = m.d;
				comb.arg3 = MUX_1;
				if( isComb(m.d) )
				{
					swap(comb.arg0, comb.arg2);
					swap(comb.arg1, comb.arg3);
				}
			}
			break;
		}
	}

	ParseDecodedMuxForConstants(res);
	return SaveParserResult(res);
}

int CNvTNTCombiner::SaveParserResult(TNT2CombinerSaveType &result)
{
	result.dwMux0 = (*m_ppDecodedMux)->m_dwMux0;
	result.dwMux1 = (*m_ppDecodedMux)->m_dwMux1;

	m_vCompiledTNTSettings.push_back(result);
	m_lastIndexTNT = m_vCompiledTNTSettings.size()-1;

	return m_lastIndexTNT;
}

void CNvTNTCombiner::ParseDecodedMuxForConstants(TNT2CombinerSaveType &res)
{
	res.unit1.constant = MUX_0;
	res.unit2.constant = MUX_0;

	for( int i=0; i<2; i++ )
	{
		if( (*m_ppDecodedMux)->isUsedInCycle(MUX_PRIM, i,COLOR_CHANNEL) || (*m_ppDecodedMux)->isUsedInCycle(MUX_PRIM, i,ALPHA_CHANNEL) )
		{
			res.units[i].constant = MUX_PRIM;
		}
		else if( (*m_ppDecodedMux)->isUsedInCycle(MUX_ENV, i,COLOR_CHANNEL) || (*m_ppDecodedMux)->isUsedInCycle(MUX_ENV, i,ALPHA_CHANNEL) )
		{
			res.units[i].constant = MUX_ENV;
		}
		else if( (*m_ppDecodedMux)->isUsedInCycle(MUX_LODFRAC, i,COLOR_CHANNEL) || (*m_ppDecodedMux)->isUsedInCycle(MUX_LODFRAC, i,ALPHA_CHANNEL) )
		{
			res.units[i].constant = MUX_LODFRAC;
		}
		else if( (*m_ppDecodedMux)->isUsedInCycle(MUX_PRIMLODFRAC, i,COLOR_CHANNEL) || (*m_ppDecodedMux)->isUsedInCycle(MUX_PRIMLODFRAC, i,ALPHA_CHANNEL) )
		{
			res.units[i].constant = MUX_PRIMLODFRAC;
		}
	}
}
