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/*
This file is part of Warzone 2100.
Copyright (C) 1999-2004 Eidos Interactive
Copyright (C) 2005-2020 Warzone 2100 Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
*
* Handles fixed point operations for degrees and matrix math.
*/
#ifndef FIXEDPOINT_H
#define FIXEDPOINT_H
#include "wzglobal.h"
//! PSX-style float emulation: 12 digit semi-floats stored in an int
// FIXME!
#define FP12_SHIFT 12
#define FP12_MULTIPLIER (1 << FP12_SHIFT)
/*
* Global Definitions (CONSTANTS)
*/
static const int DEG_360 = 65536;
static const float DEG_1 = (float)65536 / 360.f;
static inline WZ_DECL_CONST float RADIANS(float degrees)
{
return degrees * (3.141592f / 180.0f);
}
static inline WZ_DECL_CONST float UNDEG(uint16_t angle)
{
return static_cast<float>(static_cast<uint32_t>(angle)) * (360.f / 65536.0f) * (3.141592f / 180.0f);
}
// 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.
// 65536 / 360 = 8192 / 45, with a bit less overflow risk.
#define DEG(degrees) ((degrees) * 8192 / 45)
#endif // FIXEDPOINT_H
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