95 lines
2.4 KiB
NASM
Executable File
95 lines
2.4 KiB
NASM
Executable File
;===========================================================================
|
|
;Copyright (C) 1999-2005 Id Software, Inc.
|
|
;
|
|
;This file is part of Quake III Arena source code.
|
|
;
|
|
;Quake III Arena source code 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.
|
|
;
|
|
;Quake III Arena source code 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 Foobar; if not, write to the Free Software
|
|
;Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
;===========================================================================
|
|
|
|
;
|
|
; Sys_SnapVector NASM code (Andrew Henderson)
|
|
; See win32/win_shared.c for the Win32 equivalent
|
|
; This code is provided to ensure that the
|
|
; rounding behavior (and, if necessary, the
|
|
; precision) of DLL and QVM code are identical
|
|
; e.g. for network-visible operations.
|
|
; See ftol.nasm for operations on a single float,
|
|
; as used in compiled VM and DLL code that does
|
|
; not use this system trap.
|
|
;
|
|
|
|
|
|
segment .data
|
|
|
|
fpucw dd 0
|
|
cw037F dd 0x037F ; Rounding to nearest (even).
|
|
|
|
segment .text
|
|
|
|
; void Sys_SnapVector( float *v )
|
|
global Sys_SnapVector
|
|
Sys_SnapVector:
|
|
push eax
|
|
push ebp
|
|
mov ebp, esp
|
|
|
|
fnstcw [fpucw]
|
|
mov eax, dword [ebp + 12]
|
|
fldcw [cw037F]
|
|
fld dword [eax]
|
|
fistp dword [eax]
|
|
fild dword [eax]
|
|
fstp dword [eax]
|
|
fld dword [eax + 4]
|
|
fistp dword [eax + 4]
|
|
fild dword [eax + 4]
|
|
fstp dword [eax + 4]
|
|
fld dword [eax + 8]
|
|
fistp dword [eax + 8]
|
|
fild dword [eax + 8]
|
|
fstp dword [eax + 8]
|
|
fldcw [fpucw]
|
|
|
|
pop ebp
|
|
pop eax
|
|
ret
|
|
|
|
; void Sys_SnapVectorCW( float *v, unsigned short int cw )
|
|
global Sys_SnapVectorCW
|
|
Sys_SnapVector_cw:
|
|
push eax
|
|
push ebp
|
|
mov ebp, esp
|
|
|
|
fnstcw [fpucw]
|
|
mov eax, dword [ebp + 12]
|
|
fldcw [ebp + 16]
|
|
fld dword [eax]
|
|
fistp dword [eax]
|
|
fild dword [eax]
|
|
fstp dword [eax]
|
|
fld dword [eax + 4]
|
|
fistp dword [eax + 4]
|
|
fild dword [eax + 4]
|
|
fstp dword [eax + 4]
|
|
fld dword [eax + 8]
|
|
fistp dword [eax + 8]
|
|
fild dword [eax + 8]
|
|
fstp dword [eax + 8]
|
|
fldcw [fpucw]
|
|
|
|
pop ebp
|
|
pop eax
|
|
ret |