83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/*
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* Glide64 - Glide video plugin for Nintendo 64 emulators.
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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 2 of the License, or
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* 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, 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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*/
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/****************************************************************
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;
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; Glide64 - Glide Plugin for Nintendo 64 emulators
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; Project started on December 29th, 2001
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;
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; Authors:
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; Dave2001, original author, founded the project in 2001, left it in 2002
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; Gugaman, joined the project in 2002, left it in 2002
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; Sergey 'Gonetz' Lipski, joined the project in 2002, main author since fall of 2002
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; Hiroshi 'KoolSmoky' Morii, joined the project in 2007
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;
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;****************************************************************
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;
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; To modify Glide64:
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; * Write your name and (optional)email, commented by your work, so I know who did it, and so that you can find which parts you modified when it comes time to send it to me.
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; * Do NOT send me the whole project or file that you modified. Take out your modified code sections, and tell me where to put them. If people sent the whole thing, I would have many different versions, but no idea how to combine them all.
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;
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;****************************************************************/
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// (x * y) >> 16
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extern "C" int __declspec(naked) imul16(int x, int y)
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{
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_asm {
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push ebp
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mov ebp,esp
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mov eax, [x]
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mov edx, [y]
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imul edx
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shrd eax,edx,16
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leave
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ret
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}
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}
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//(x * y) >> 14
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extern "C" int __declspec(naked) imul14(int x, int y)
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{
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_asm {
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push ebp
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mov ebp,esp
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mov eax, [x]
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mov edx, [y]
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imul edx
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shrd eax,edx,14
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leave
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ret
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}
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}
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//(x << 16) / y
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extern "C" int __declspec(naked) idiv16(int x, int y)
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{
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_asm {
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push ebp
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mov ebp,esp
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mov eax, [x]
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mov ebx, [y]
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mov edx,eax
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sar edx,16
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shl eax,16
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idiv ebx
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leave
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ret
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}
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} |