Source release of Wolfenstein 3D Classic Platinum for iOS, 1.1

2026-03-20 00:49:35 +01:00 · 2012-01-31 16:55:36 -06:00
parent e20e553baf
commit a82aba6b94
421 changed files with 68803 additions and 0 deletions
--- a/wolf3d/code/env/angle.c
+++ b/wolf3d/code/env/angle.c
@@ -0,0 +1,172 @@
+/*
+
+	Copyright (C) 2005 Michael Liebscher <johnnycanuck@users.sourceforge.net>
+	Copyright (C) 1997-2001 Id Software, Inc.
+
+	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.
+
+*/
+
+/*
+ *	angle.h: Angle math routines.
+ *	
+ *	Author:	Michael Liebscher <johnnycanuck@users.sourceforge.net>	    
+ *
+ *	Acknowledgement:
+ *	Portion of this code was derived from Quake II, and was originally
+ *	written by Id Software, Inc.
+ *
+ */
+
+#include "../wolfiphone.h"
+
+/*
+-----------------------------------------------------------------------------
+ Function: angle_diff -Finds the difference between two angles.
+
+ Parameters: angle1, angle2 -[in] Angles in Radians.
+
+ Returns: 
+		Returns the absolute difference between two angles, this will always
+		be between 0 and 180 degrees.
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+INLINECALL float angle_diff( float angle1, float angle2 )
+{
+	float d;
+
+	if( angle1 > angle2 )
+	{
+		d = angle1 - angle2;
+	}
+	else
+	{
+		d = angle2 - angle1;
+	}
+
+	if( d > M_PI )
+	{
+		return 2 * M_PI - d;
+	}
+	else
+	{
+		return d;
+	}
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: angle_wise -Clockwise distance between two angles.
+
+ Parameters: angle1, angle2 -[in] Angles in Radians.
+
+ Returns: 
+		Returns the clockwise distance from angle2 to angle1, this may be 
+		greater than 180 degrees.
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+INLINECALL float angle_wise( float angle1, float angle2 )
+{
+	if( angle1 > angle2 )
+	{
+		return angle1 - angle2;
+	}
+	else
+	{
+		return angle1 + 2 * M_PI - angle2;
+	}
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: interpolate_angle -Linear interpolate between angle A and B by
+								fraction 'f'.
+
+ Parameters: 
+
+ Returns: 
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+INLINECALL float interpolate_angle( float from, float to, float fraction )
+{
+	float diff = angle_diff( from, to ) * fraction;
+
+	if( angle_wise( to, from ) >= M_PI )
+	{
+		return from - diff;
+	}
+	else
+	{
+		return from + diff;
+	}
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: normalize_angle -
+
+ Parameters: 
+
+ Returns: Nothing.
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+INLINECALL float normalize_angle( float angle )
+{
+	while( angle < 0 )
+	{
+		angle += (2 * M_PI);
+	}
+
+	while( angle >= (2 * M_PI) )
+	{
+		angle -= (2 * M_PI);
+	}
+
+	return angle;
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: LerpAngle -Linear interpolate allowing for the Modulo 360 problem.
+
+ Parameters:
+
+ Returns:
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+INLINECALL float LerpAngle( float from, float to, float frac )
+{
+	if( to - from > 180 ) 
+	{
+		to -= 360;
+	}
+
+	if( to - from < -180 ) 
+	{
+		to += 360;
+	}
+	
+	return from + frac * (to - from);
+}