db8ca37fa3
git-svn-id: https://svn.code.sf.net/p/q3cellshading/code/trunk@2 db09e94b-7117-0410-a7e6-85ae5ff6e0e9
151 lines
3 KiB
NASM
151 lines
3 KiB
NASM
;===========================================================================
|
|
;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
|
|
;===========================================================================
|
|
|
|
;
|
|
; qftol -- fast floating point to long conversion.
|
|
;
|
|
|
|
segment .data
|
|
|
|
temp dd 0.0
|
|
fpucw dd 0
|
|
|
|
; Precision Control Field , 2 bits / 0x0300
|
|
; PC24 0x0000 Single precision (24 bits).
|
|
; PC53 0x0200 Double precision (53 bits).
|
|
; PC64 0x0300 Extended precision (64 bits).
|
|
|
|
; Rounding Control Field, 2 bits / 0x0C00
|
|
; RCN 0x0000 Rounding to nearest (even).
|
|
; RCD 0x0400 Rounding down (directed, minus).
|
|
; RCU 0x0800 Rounding up (directed plus).
|
|
; RC0 0x0C00 Rounding towards zero (chop mode).
|
|
|
|
|
|
; rounding towards nearest (even)
|
|
cw027F dd 0x027F ; double precision
|
|
cw037F dd 0x037F ; extended precision
|
|
|
|
; rounding towards zero (chop mode)
|
|
cw0E7F dd 0x0E7F ; double precision
|
|
cw0F7F dd 0x0F7F ; extended precision
|
|
|
|
|
|
segment .text
|
|
|
|
;
|
|
; int qftol( void ) - default control word
|
|
;
|
|
|
|
global qftol
|
|
|
|
qftol:
|
|
fistp dword [temp]
|
|
mov eax, [temp]
|
|
ret
|
|
|
|
|
|
;
|
|
; int qftol027F( void ) - DirectX FPU
|
|
;
|
|
|
|
global qftol027F
|
|
|
|
qftol027F:
|
|
fnstcw [fpucw]
|
|
fldcw [cw027F]
|
|
fistp dword [temp]
|
|
fldcw [fpucw]
|
|
mov eax, [temp]
|
|
ret
|
|
|
|
;
|
|
; int qftol037F( void ) - Linux FPU
|
|
;
|
|
|
|
global qftol037F
|
|
|
|
qftol037F:
|
|
fnstcw [fpucw]
|
|
fldcw [cw037F]
|
|
fistp dword [temp]
|
|
fldcw [fpucw]
|
|
mov eax, [temp]
|
|
ret
|
|
|
|
|
|
;
|
|
; int qftol0F7F( void ) - ANSI
|
|
;
|
|
|
|
global qftol0F7F
|
|
|
|
qftol0F7F:
|
|
fnstcw [fpucw]
|
|
fldcw [cw0F7F]
|
|
fistp dword [temp]
|
|
fldcw [fpucw]
|
|
mov eax, [temp]
|
|
ret
|
|
|
|
;
|
|
; int qftol0E7F( void )
|
|
;
|
|
|
|
global qftol0E7F
|
|
|
|
qftol0E7F:
|
|
fnstcw [fpucw]
|
|
fldcw [cw0E7F]
|
|
fistp dword [temp]
|
|
fldcw [fpucw]
|
|
mov eax, [temp]
|
|
ret
|
|
|
|
|
|
|
|
;
|
|
; long Q_ftol( float q )
|
|
;
|
|
|
|
global Q_ftol
|
|
|
|
Q_ftol:
|
|
fld dword [esp+4]
|
|
fistp dword [temp]
|
|
mov eax, [temp]
|
|
ret
|
|
|
|
|
|
;
|
|
; long qftol0F7F( float q ) - Linux FPU
|
|
;
|
|
|
|
global Q_ftol0F7F
|
|
|
|
Q_ftol0F7F:
|
|
fnstcw [fpucw]
|
|
fld dword [esp+4]
|
|
fldcw [cw0F7F]
|
|
fistp dword [temp]
|
|
fldcw [fpucw]
|
|
mov eax, [temp]
|
|
ret
|
|
|