Initial commit of Update 3 QuakeC

quakec_mg1/math.qc

@@ -0,0 +1,86 @@
+/*  Copyright (C) 1996-2022 id Software LLC
+
+    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
+
+    See file, 'COPYING', for details.
+*/
+
+///////////////////////////////////////////////////////////
+// Math related functions
+///////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////
+// Modulus
+
+float mod(float v, float m)  
+{
+    float r;
+	
+	if(m == 0) objerror("Illegal op: mod(x, 0)!");
+	if(fabs(v) < m) return v;
+	if(v == m) return 0;
+    
+	r = floor(v / m) * m;
+    
+	return v - r;
+}
+
+///////////////////////////////////////////////////////////
+// Sine
+
+float sin(float angle)
+{
+    vector a = {0, angle, 0};
+    makevectors(a);
+    return v_forward_y;
+}
+
+///////////////////////////////////////////////////////////
+// Cosine
+
+float cos(float angle)
+{
+    vector a = {0, angle, 0};
+    makevectors(a);
+    return v_forward_x;
+}
+
+/*
+================
+Bitshift emulation
+================
+*/
+
+float SUB_LeftShift(float num, float bits)
+{
+	bits = floor(bits);
+	while(bits > 0)
+	{
+		num*= 2;
+		bits--;
+	}
+	return num;
+}
+
+float SUB_RightShift(float num, float bits)
+{
+	bits = floor(bits);
+	while(bits > 0)
+	{
+		num/= 2;
+		bits--;
+	}
+	return num;
+}