50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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This file is part of Warzone 2100.
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Copyright (C) 1999-2004 Eidos Interactive
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Copyright (C) 2005-2011 Warzone 2100 Project
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Warzone 2100 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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Warzone 2100 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 Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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*
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* Handles fixed point operations for degrees and matrix math.
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*/
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#ifndef FIXEDPOINT_H
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#define FIXEDPOINT_H
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#include "wzglobal.h"
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//! PSX-style float emulation: 12 digit semi-floats stored in an int
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// FIXME!
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#define FP12_SHIFT 12
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#define FP12_MULTIPLIER (1 << FP12_SHIFT)
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/*
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* Global Definitions (CONSTANTS)
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*/
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static const int DEG_360 = 65536;
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static const float DEG_1 = (float)65536 / 360.f;
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static inline WZ_DECL_CONST float UNDEG(uint16_t angle) { return angle * (360 / 65536.0f); }
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// Should be a macro (or two separate functions), since we can't do function overloading for float and int, and we don't want to use the float version for anything game-state related.
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// 65536 / 360 = 8192 / 45, with a bit less overflow risk.
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#define DEG(degrees) ((degrees) * 8192 / 45)
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#endif // FIXEDPOINT_H
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