175 lines
3.5 KiB
C++
175 lines
3.5 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 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 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ags/lib/allegro/fixed.h"
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#include "ags/lib/allegro/error.h"
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#include "ags/globals.h"
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namespace AGS3 {
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fixed ftofix(double x) {
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if (x > 32767.0) {
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*_G(allegro_errno) = AL_ERANGE;
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return 0x7FFFFFFF;
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}
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if (x < -32767.0) {
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*_G(allegro_errno) = AL_ERANGE;
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return (fixed) - 0x7FFFFFFF;
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}
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return (fixed)(x * 65536.0 + (x < 0 ? -0.5 : 0.5));
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}
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double fixtof(fixed x) {
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return (double)x / 65536.0;
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}
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fixed fixadd(fixed x, fixed y) {
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fixed result = x + y;
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if (result >= 0) {
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if ((x < 0) && (y < 0)) {
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*_G(allegro_errno) = AL_ERANGE;
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return (fixed) - 0x7FFFFFFF;
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} else
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return result;
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} else {
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if ((x > 0) && (y > 0)) {
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*_G(allegro_errno) = AL_ERANGE;
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return 0x7FFFFFFF;
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} else
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return result;
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}
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}
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fixed fixsub(fixed x, fixed y) {
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fixed result = x - y;
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if (result >= 0) {
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if ((x < 0) && (y > 0)) {
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*_G(allegro_errno) = AL_ERANGE;
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return (fixed) - 0x7FFFFFFF;
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} else
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return result;
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} else {
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if ((x > 0) && (y < 0)) {
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*_G(allegro_errno) = AL_ERANGE;
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return 0x7FFFFFFF;
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} else
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return result;
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}
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}
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fixed fixmul(fixed x, fixed y) {
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int64 lx = x;
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int64 ly = y;
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int64 lres = (lx * ly);
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if (lres > 0x7FFFFFFF0000LL) {
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*_G(allegro_errno) = AL_ERANGE;
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return 0x7FFFFFFF;
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} else if (lres < -0x7FFFFFFF0000LL) {
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*_G(allegro_errno) = AL_ERANGE;
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return 0x80000000;
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} else {
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int res = lres >> 16;
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return res;
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}
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}
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fixed fixdiv(fixed x, fixed y) {
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if (y == 0) {
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*_G(allegro_errno) = AL_ERANGE;
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return (fixed)(x < 0) ? -0x7FFFFFFF : 0x7FFFFFFF;
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} else
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return ftofix(fixtof(x) / fixtof(y));
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}
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int fixfloor(fixed x) {
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// FIXME: GCC warning "this condition has identical branches [-Wduplicated-branches]" on this code i.e. both branches are functionally identical. Remove?
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#if 0
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/* (x >> 16) is not portable */
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if (x >= 0)
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return (x >> 16);
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else
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return ~((~x) >> 16);
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#else
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return (x >> 16);
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#endif
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}
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int fixceil(fixed x) {
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if (x > 0x7FFF0000) {
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*_G(allegro_errno) = AL_ERANGE;
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return 0x7FFF;
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}
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return fixfloor(x + 0xFFFF);
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}
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fixed itofix(int x) {
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return x << 16;
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}
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int fixtoi(fixed x) {
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return fixfloor(x) + ((x & 0x8000) >> 15);
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}
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fixed fixcos(fixed x) {
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return _cos_tbl[((x + 0x4000) >> 15) & 0x1FF];
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}
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fixed fixsin(fixed x) {
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return _cos_tbl[((x - 0x400000 + 0x4000) >> 15) & 0x1FF];
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}
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fixed fixtan(fixed x) {
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return _tan_tbl[((x + 0x4000) >> 15) & 0xFF];
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}
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fixed fixacos(fixed x) {
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if ((x < -65536) || (x > 65536)) {
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*_G(allegro_errno) = AL_EDOM;
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return 0;
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}
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return _acos_tbl[(x + 65536 + 127) >> 8];
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}
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fixed fixasin(fixed x) {
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if ((x < -65536) || (x > 65536)) {
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*_G(allegro_errno) = AL_EDOM;
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return 0;
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}
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return 0x00400000 - _acos_tbl[(x + 65536 + 127) >> 8];
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}
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} // namespace AGS3
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