87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/* Copyright (C) 1996-2022 id Software LLC
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(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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See file, 'COPYING', for details.
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*/
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///////////////////////////////////////////////////////////
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// Math related functions
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///////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////
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// Modulus
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float mod(float v, float m)
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{
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float r;
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if(m == 0) objerror("Illegal op: mod(x, 0)!");
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if(fabs(v) < m) return v;
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if(v == m) return 0;
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r = floor(v / m) * m;
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return v - r;
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}
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///////////////////////////////////////////////////////////
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// Sine
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float sin(float angle)
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{
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vector a = {0, angle, 0};
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makevectors(a);
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return v_forward_y;
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}
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///////////////////////////////////////////////////////////
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// Cosine
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float cos(float angle)
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{
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vector a = {0, angle, 0};
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makevectors(a);
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return v_forward_x;
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}
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/*
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================
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Bitshift emulation
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================
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*/
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float SUB_LeftShift(float num, float bits)
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{
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bits = floor(bits);
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while(bits > 0)
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{
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num*= 2;
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bits--;
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}
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return num;
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}
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float SUB_RightShift(float num, float bits)
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{
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bits = floor(bits);
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while(bits > 0)
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{
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num/= 2;
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bits--;
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}
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return num;
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}
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