mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 12:52:46 +00:00
96 lines
2.1 KiB
ArmAsm
96 lines
2.1 KiB
ArmAsm
/*
|
|
d_scana.S
|
|
|
|
x86 assembly-language turbulent texture mapping code
|
|
|
|
Copyright (C) 1996-1997 Id Software, Inc.
|
|
|
|
This program 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.
|
|
|
|
This program 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 this program; if not, write to:
|
|
|
|
Free Software Foundation, Inc.
|
|
59 Temple Place - Suite 330
|
|
Boston, MA 02111-1307, USA
|
|
|
|
$Id$
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
#include "asm_i386.h"
|
|
#include "quakeasm.h"
|
|
#include "asm_draw.h"
|
|
#include "d_ifacea.h"
|
|
|
|
#ifdef USE_INTEL_ASM
|
|
|
|
.data
|
|
|
|
.text
|
|
|
|
//----------------------------------------------------------------------
|
|
// turbulent texture mapping code
|
|
//----------------------------------------------------------------------
|
|
|
|
.align 4
|
|
.globl C(D_DrawTurbulent8Span)
|
|
C(D_DrawTurbulent8Span):
|
|
pushl %ebp // preserve caller's stack frame pointer
|
|
pushl %esi // preserve register variables
|
|
pushl %edi
|
|
pushl %ebx
|
|
|
|
movl C(r_turb_s),%esi
|
|
movl C(r_turb_t),%ecx
|
|
movl C(r_turb_pdest),%edi
|
|
movl C(r_turb_spancount),%ebx
|
|
|
|
Llp:
|
|
movl %ecx,%eax
|
|
movl %esi,%edx
|
|
sarl $16,%eax
|
|
movl C(r_turb_turb),%ebp
|
|
sarl $16,%edx
|
|
andl $(CYCLE-1),%eax
|
|
andl $(CYCLE-1),%edx
|
|
movl (%ebp,%eax,4),%eax
|
|
movl (%ebp,%edx,4),%edx
|
|
addl %esi,%eax
|
|
sarl $16,%eax
|
|
addl %ecx,%edx
|
|
sarl $16,%edx
|
|
andl $(TURB_TEX_SIZE-1),%eax
|
|
andl $(TURB_TEX_SIZE-1),%edx
|
|
shll $6,%edx
|
|
movl C(r_turb_pbase),%ebp
|
|
addl %eax,%edx
|
|
incl %edi
|
|
addl C(r_turb_sstep),%esi
|
|
addl C(r_turb_tstep),%ecx
|
|
movb (%ebp,%edx,1),%dl
|
|
decl %ebx
|
|
movb %dl,-1(%edi)
|
|
jnz Llp
|
|
|
|
movl %edi,C(r_turb_pdest)
|
|
|
|
popl %ebx // restore register variables
|
|
popl %edi
|
|
popl %esi
|
|
popl %ebp // restore caller's stack frame pointer
|
|
ret
|
|
|
|
#endif // USE_INTEL_ASM
|
|
|