2001-02-19 21:15:25 +00:00
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/*
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d_scana.S
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x86 assembly-language turbulent texture mapping code
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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.
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See the GNU General Public License for more details.
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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2001-03-27 21:46:49 +00:00
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#include "QF/asm_i386.h"
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2001-02-19 21:15:25 +00:00
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#include "quakeasm.h"
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#include "asm_draw.h"
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#include "d_ifacea.h"
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#ifdef USE_INTEL_ASM
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.data
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.text
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//----------------------------------------------------------------------
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// turbulent texture mapping code
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//----------------------------------------------------------------------
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.align 4
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.globl C(D_DrawTurbulent8Span)
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C(D_DrawTurbulent8Span):
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pushl %ebp // preserve caller's stack frame pointer
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pushl %esi // preserve register variables
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pushl %edi
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pushl %ebx
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movl C(r_turb_s),%esi
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movl C(r_turb_t),%ecx
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movl C(r_turb_pdest),%edi
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movl C(r_turb_spancount),%ebx
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Llp:
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movl %ecx,%eax
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movl %esi,%edx
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sarl $16,%eax
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movl C(r_turb_turb),%ebp
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sarl $16,%edx
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andl $(CYCLE-1),%eax
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andl $(CYCLE-1),%edx
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movl (%ebp,%eax,4),%eax
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movl (%ebp,%edx,4),%edx
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addl %esi,%eax
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sarl $16,%eax
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addl %ecx,%edx
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sarl $16,%edx
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andl $(TURB_TEX_SIZE-1),%eax
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andl $(TURB_TEX_SIZE-1),%edx
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shll $6,%edx
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movl C(r_turb_pbase),%ebp
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addl %eax,%edx
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incl %edi
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addl C(r_turb_sstep),%esi
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addl C(r_turb_tstep),%ecx
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movb (%ebp,%edx,1),%dl
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decl %ebx
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movb %dl,-1(%edi)
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jnz Llp
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movl %edi,C(r_turb_pdest)
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popl %ebx // restore register variables
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popl %edi
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popl %esi
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popl %ebp // restore caller's stack frame pointer
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ret
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#endif // USE_INTEL_ASM
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