mirror of
https://github.com/libretro/scummvm.git
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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "illusions/illusions.h"
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#include "illusions/fixedpoint.h"
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namespace Illusions {
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FixedPoint16 floatToFixed(float value) {
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return value * 65536.0;
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}
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float fixedToFloat(FixedPoint16 value) {
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return value / 65536.0;
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}
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FixedPoint16 fixedMul(FixedPoint16 a, FixedPoint16 b) {
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return ((float)a * b) / 65536.0;
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}
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FixedPoint16 fixedDiv(FixedPoint16 a, FixedPoint16 b) {
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return ((float)a / b) * 65536.0;
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}
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int16 fixedTrunc(FixedPoint16 value) {
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// CHECKME Not sure if this correct
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int16 result = (value >> 16) & 0xFFFF;
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if ((value & 0xFFFF) >= 0x8000)
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++result;
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return result;
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}
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FixedPoint16 fixedDistance(FixedPoint16 x1, FixedPoint16 y1, FixedPoint16 x2, FixedPoint16 y2) {
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float xd = fixedToFloat(x1) - fixedToFloat(x2);
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float yd = fixedToFloat(y1) - fixedToFloat(y2);
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if (xd != 0.0f || yd != 0.0f)
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return floatToFixed(sqrt(xd * xd + yd * yd));
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return 0;
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}
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FixedPoint16 fixedAtan(FixedPoint16 value) {
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//return floatToFixed(atan2(1.0, fixedToFloat(value)));
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return floatToFixed(atan(fixedToFloat(value)));
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}
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FixedPoint16 fixedCos(FixedPoint16 value) {
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return floatToFixed(cos(fixedToFloat(value)));
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}
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FixedPoint16 fixedSin(FixedPoint16 value) {
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return floatToFixed(sin(fixedToFloat(value)));
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}
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} // End of namespace Illusions
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