Source release of Wolfenstein 3D Classic Platinum for iOS, 1.0

2026-03-20 08:59:51 +01:00 · 2012-01-31 16:46:52 -06:00
commit e20e553baf
1001 changed files with 54065 additions and 0 deletions
--- a/wolf3d/newCode/env/math.c
+++ b/wolf3d/newCode/env/math.c
@@ -0,0 +1,224 @@
+/*
+
+	Copyright (C) 2004 Michael Liebscher
+	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.
+
+*/
+
+/*
+ *	math.c:	Math routines.
+ *	
+ *	Author:	Michael Liebscher <johnnycanuck@users.sourceforge.net>	 
+ *	Date:	2004  
+ *
+ *	Acknowledgement:
+ *	This code was derived from Quake II, and was originally
+ *	written by Id Software, Inc.
+ *
+ */
+
+#include "../wolfiphone.h"
+
+
+
+
+
+
+////////////////////////////
+//
+//	Square Root
+//
+////////////////////////////
+
+/*
+-----------------------------------------------------------------------------
+ Function: _sqrtf -Calculates the square root.
+
+ Parameters: x -[in] Nonnegative floating-point value
+
+ Returns: The square-root of x.
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+PUBLIC float _sqrtf( float x )
+{
+	return (float)sqrt( x );
+}
+
+
+/*
+-----------------------------------------------------------------------------
+ Function: _3DNow_Sqrt -Calculates the square root.
+
+ Parameters: x -[in] Nonnegative floating-point value
+
+ Returns: The square-root of x.
+
+ Notes: 15-Bit Precision
+-----------------------------------------------------------------------------
+*/
+#if __i386__
+
+PUBLIC float _3DNow_Sqrt( float x )
+{
+	float	root = 0.f;
+
+#if( _MSC_VER || __WATCOMC__ )
+
+	__asm
+	{
+		femms
+		movd		mm0, x
+		pfrsqrt		mm1, mm0
+		punpckldq	mm0, mm0
+		pfmul		mm0, mm1
+		movd		root, mm0
+		femms
+	}
+
+#endif
+
+	return root;
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: _SSE_Sqrt -Calculates the square root.
+
+ Parameters: x -[in] Nonnegative floating-point value
+
+ Returns: The square-root of x.
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+float _SSE_Sqrt( float x )
+{
+	float	root = 0.f;
+
+#if( _MSC_VER || __WATCOMC__ )
+
+	__asm
+	{
+		sqrtss		xmm0, x
+		movss		root, xmm0
+	}
+
+
+#endif
+
+	return root;
+}
+
+#endif /* __i386__ */
+
+////////////////////////////
+//
+//	End Square Root
+//
+////////////////////////////
+
+
+float (*pfSqrt)( float x )  = _sqrtf;
+
+
+
+
+/*
+-----------------------------------------------------------------------------
+ Function: 
+
+ Parameters:
+
+ Returns:
+
+ Notes: 
+-----------------------------------------------------------------------------
+*/
+PUBLIC int my_log2( int val )
+{
+	int answer = 0;
+	while( ( val >>= 1 ) != 0 ) 
+	{
+		answer++;
+	}
+	return answer;
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: CalcFov	-Calculate the field of view.
+ 
+ Parameters:fov_x -[in] Must be within 1 and 179 degrees.
+			width -[in] Width of viewing area.
+			height -[in] Height of viewing area.
+
+ Returns: The field of view in degrees.
+ 
+ Notes:
+
+-----------------------------------------------------------------------------
+*/
+PUBLIC float CalcFov( float fov_x, float width, float height )
+{
+	if( fov_x < 1 || fov_x > 179 )
+	{
+		Com_Error( ERR_DROP, "Bad fov: %f", fov_x );
+	}
+
+	return (float)RAD2DEG( atan( height / ( width / tan( fov_x / 360 * M_PI ) ) ) ) * 2;
+}
+
+/*
+-----------------------------------------------------------------------------
+ Function: MathLib_Init	-Initialize optimized math routines.
+ 
+ Parameters: Nothing.
+
+ Returns: Nothing.
+ 
+ Notes:
+
+-----------------------------------------------------------------------------
+*/
+PUBLIC void MathLib_Init( void )
+{
+	Com_Printf( "Initializing Math Module\n" );
+	
+#if 0//__i386__
+
+	if( main_cpu_s.b3DNow )
+	{
+//		pfSqrt = _3DNow_Sqrt;
+
+		Com_Printf( "...using 3DNow!\n" );
+	}
+		
+	if( main_cpu_s.bSSE )
+	{
+//		pfSqrt = _SSE_Sqrt;
+
+		Com_Printf( "...using SSE\n" );
+	}
+
+#endif
+}
+
+
+
+