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Source release of Wolfenstein 3D Classic Platinum for iOS, 1.1
This commit is contained in:
Travis Bradshaw
341
wolf3d/code/wolf/wolf_math.c
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341
wolf3d/code/wolf/wolf_math.c
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/*
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Copyright (C) 2004 Michael Liebscher
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Copyright (C) 2000 by DarkOne the Hacker
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* wolf_math.c: Wolfenstein 3-D math routines.
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*
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* Author: Michael Liebscher <johnnycanuck@users.sourceforge.net>
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* Date: 2004
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*
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* Acknowledgement:
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* This code was derived from NewWolf, and was originally
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* written by DarkOne the Hacker.
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*
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*
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*/
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#include "../wolfiphone.h"
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#define XRES 640
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#define YRES 480
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// ------------------------- * LUTs * -------------------------
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double SinTable[ ANG_360 + ANG_90 + 1 ],
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*CosTable = SinTable + ANG_90,
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TanTable[ ANG_360 + 1 ];
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int XnextTable[ ANG_360 + 1 ],
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YnextTable[ ANG_360 + 1 ];
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int ColumnAngle[ 640 ]; // ViewAngle=PlayerAngle+ColumnAngle[curcolumn]; /in fines/
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char dx4dir[5]={1, 0, -1, 0, 0}; // dx & dy based on direction
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char dy4dir[5]={0, 1, 0, -1, 0};
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char dx8dir[9]={1, 1, 0, -1, -1, -1, 0, 1, 0}; // dx & dy based on direction
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char dy8dir[9]={0, 1, 1, 1, 0, -1, -1, -1, 0};
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dir4type opposite4[5]={2, 3, 0, 1, 4};
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dir8type opposite8[9]={4, 5, 6, 7, 0, 1, 2, 3, 8};
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dir8type dir4to8[5]={0, 2, 4, 6, 8};
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dir8type diagonal[9][9]=
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{
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/* east */ {dir8_nodir, dir8_nodir, dir8_northeast, dir8_nodir, dir8_nodir, dir8_nodir, dir8_southeast, dir8_nodir, dir8_nodir},
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{dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir},
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/* north */ {dir8_northeast, dir8_nodir, dir8_nodir, dir8_nodir, dir8_northwest, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir},
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{dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir},
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/* west */ {dir8_nodir, dir8_nodir, dir8_northwest, dir8_nodir, dir8_nodir, dir8_nodir, dir8_southwest, dir8_nodir, dir8_nodir},
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{dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir},
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/* south */ {dir8_southeast, dir8_nodir, dir8_nodir, dir8_nodir, dir8_southwest, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir},
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{dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir},
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{dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir, dir8_nodir}
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};
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// dir of delta tooks dx{-1|0|1}+1 & dy{-1|0|1}+1 and give direction
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dir4type dir4d[3][3]={{dir4_nodir, dir4_west , dir4_nodir},
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{dir4_south, dir4_nodir, dir4_north},
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{dir4_nodir, dir4_east , dir4_nodir}};
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int dir8angle[9]={ANG_0, ANG_45, ANG_90, ANG_135, ANG_180, ANG_225, ANG_270, ANG_315, ANG_0};
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int dir4angle[5]={ANG_0, ANG_90, ANG_180, ANG_270, ANG_0};
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/*
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-----------------------------------------------------------------------------
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Function:
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Parameters:
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC int G_Build_Tables( void )
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{
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double angle, tanfov2, tanval, value;
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int n;
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for( n = 0 ; n <= ANG_90 ; ++n )
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{
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angle = FINE2RAD( n );
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value = sin( angle );
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SinTable[ n ] = SinTable[ ANG_180 - n ] = SinTable[ n + ANG_360 ] = value;
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SinTable[ ANG_180 + n ] = SinTable[ ANG_360 - n ] = -value;
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}
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for( n = 0 ; n <= ANG_360 ; ++n )
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{
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angle = FINE2RAD( n ); //angle is in radians, n is in FINEs
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if( n == ANG_90 || n == ANG_270 )
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{
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TanTable[ n ] = tan( FINE2RAD( n - 0.5 ) ); // infinity
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YnextTable[ n ] = (int)(FLOATTILE * tan( FINE2RAD( n - 0.5 ) )); // infinity
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}
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else
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{
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TanTable[ n ] = tan( angle );
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YnextTable[ n ] = (int)(FLOATTILE * tan( angle ));
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}
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if( n == ANG_0 || n == ANG_360 )
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XnextTable[ n ] = (int)(FLOATTILE / tan( FINE2RAD( n + 0.5 ) )); // infinity
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else if( n == ANG_180 )
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XnextTable[ n ] = (int)(FLOATTILE / tan(FINE2RAD( n - 0.5 ) )); // -infinity
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else if( n == ANG_90 || n == ANG_270 )
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XnextTable[ n ] = 0;
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else
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XnextTable[ n ] = (int)(FLOATTILE / tan( angle ));
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}
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tanfov2 = TanDgr( CalcFov( 75, XRES, YRES) / 2.0 ) * ((float)XRES / (float)YRES );
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for( n = 0 ; n < XRES ; ++n )
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{
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tanval = tanfov2 * (-1.0 + 2.0 * (double)n / (double)(XRES-1) );
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ColumnAngle[ n ] = (int)RAD2FINE( atan( tanval ) );
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}
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US_InitRndT( 1 ); // random number generators
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return 1;
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}
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/*
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-----------------------------------------------------------------------------
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Function: NormalizeAngle -clips angle to [0..360] bounds.
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Parameters:
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC int NormalizeAngle( int alpha )
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{
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if( alpha > ANG_360 )
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alpha %= ANG_360;
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if(alpha<ANG_0)
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alpha = ANG_360 - (-alpha) % ANG_360;
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return alpha;
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}
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/*
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-----------------------------------------------------------------------------
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Function:
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Parameters:
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC quadrant GetQuadrant( float angle )
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{
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angle = normalize_angle( angle );
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if( angle < M_PI / 2 )
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{
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return q_first;
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}
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else if( angle < M_PI )
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{
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return q_second;
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}
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else if( angle < 3 * M_PI / 2 )
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{
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return q_third;
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}
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else
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{
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return q_fourth;
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}
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}
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/*
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-----------------------------------------------------------------------------
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Function:
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Parameters:
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC dir4type Get4dir( float angle )
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{
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angle = normalize_angle( angle + M_PI / 4 );
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if( angle < M_PI / 2 )
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{
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return dir4_east;
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}
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else if( angle < M_PI )
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{
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return dir4_north;
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}
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else if( angle < 3 * M_PI / 2 )
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{
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return dir4_west;
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}
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else
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{
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return dir4_south;
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}
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}
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/*
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-----------------------------------------------------------------------------
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Function: Get8dir -Get 8 point direction.
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Parameters: angle -[in] Radian angle.
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Returns: Directional point.
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC dir8type Get8dir( float angle )
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{
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angle = normalize_angle( angle + M_PI / 12 );
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if( angle <= (M_PI / 4) )
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{
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return dir8_east;
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}
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else if( angle < (M_PI / 2) )
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{
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return dir8_northeast;
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}
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else if( angle <= (3 * M_PI / 4) )
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{
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return dir8_north;
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}
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else if( angle < M_PI )
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{
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return dir8_northwest;
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}
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else if( angle <= (5 * M_PI / 4) )
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{
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return dir8_west;
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}
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else if( angle < (3 * M_PI / 2) )
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{
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return dir8_southwest;
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}
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else if( angle <= (7 * M_PI / 4) )
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{
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return dir8_south;
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}
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else
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{
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return dir8_southeast;
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}
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}
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/*
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-----------------------------------------------------------------------------
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Function: Point2LineDist -calculates distance between a point (x, y) and
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a line.
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Parameters:
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC int Point2LineDist( int x, int y, int a )
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{
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return ABS( (int)(x * SinTable[ a ] - y * CosTable[ a ]) );
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}
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/*
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-----------------------------------------------------------------------------
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Function: LineLen2Point -Calculates line length to the point nearest to (poin)
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Parameters:
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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PUBLIC int LineLen2Point( int x, int y, int a )
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{
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return (int)(x * CosTable[ a ] + y * SinTable[ a ] );
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}
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/*
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-----------------------------------------------------------------------------
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Function:
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Parameters:
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Returns:
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Notes:
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Function returns angle in radians
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point2 = {x,y}
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/ |
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/ |
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/ |
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/a______|----------> x
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point1 = {x, y}
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-----------------------------------------------------------------------------
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*/
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PUBLIC float TransformPoint( double Point1X, double Point1Y, double Point2X, double Point2Y )
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{
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float angle;
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angle = atan2( Point1Y - Point2Y, Point1X - Point2X );
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return normalize_angle( angle );
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}
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