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/*
surf16.S

(description)

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: surf16.s,v 1.2 2005-07-05 20:01:37 disconn3ct Exp $
*/
// surf16.s
// x86 assembly-language 16 bpp surface block drawing code.

#include "asm_i386.h"
#include "quakeasm.h"
#include "asm_draw.h"

#ifdef id386

//----------------------------------------------------------------------
// Surface block drawer
//----------------------------------------------------------------------

.data

k: .long 0
loopentry: .long 0

.align 4
blockjumptable16:
.long LEnter2_16
.long LEnter4_16
.long 0, LEnter8_16
.long 0, 0, 0, LEnter16_16


.text

.align 4
.globl C(R_Surf16Start)
C(R_Surf16Start):

.align 4
.globl C(R_DrawSurfaceBlock16)
C(R_DrawSurfaceBlock16):
pushl %ebp // preserve caller's stack frame
pushl %edi
pushl %esi // preserve register variables
pushl %ebx

movl C(blocksize),%eax
movl C(prowdestbase),%edi
movl C(pbasesource),%esi
movl C(sourcesstep),%ebx
movl blockjumptable16-4(,%eax,2),%ecx
movl %eax,k
movl %ecx,loopentry
movl C(lightleft),%edx
movl C(lightright),%ebp

Lblockloop16:

subl %edx,%ebp
movb C(blockdivshift),%cl
sarl %cl,%ebp
jns Lp1_16
testl C(blockdivmask),%ebp
jz Lp1_16
incl %ebp
Lp1_16:

subl %eax,%eax
subl %ecx,%ecx // high words must be 0 in loop for addressing

jmp *loopentry

.align 4

#include "block16.h"

movl C(pbasesource),%esi
movl C(lightleft),%edx
movl C(lightright),%ebp
movl C(sourcetstep),%eax
movl C(lightrightstep),%ecx
movl C(prowdestbase),%edi

addl %eax,%esi
addl %ecx,%ebp

movl C(lightleftstep),%eax
movl C(surfrowbytes),%ecx

addl %eax,%edx
addl %ecx,%edi

movl %esi,C(pbasesource)
movl %ebp,C(lightright)
movl k,%eax
movl %edx,C(lightleft)
decl %eax
movl %edi,C(prowdestbase)
movl %eax,k
jnz Lblockloop16

popl %ebx // restore register variables
popl %esi
popl %edi
popl %ebp // restore the caller's stack frame
ret

.globl C(R_Surf16End)
C(R_Surf16End):

//----------------------------------------------------------------------
// Code patching routines
//----------------------------------------------------------------------
.data

.align 4
LPatchTable16:
.long LBPatch0-4
.long LBPatch1-4
.long LBPatch2-4
.long LBPatch3-4
.long LBPatch4-4
.long LBPatch5-4
.long LBPatch6-4
.long LBPatch7-4
.long LBPatch8-4
.long LBPatch9-4
.long LBPatch10-4
.long LBPatch11-4
.long LBPatch12-4
.long LBPatch13-4
.long LBPatch14-4
.long LBPatch15-4

.text

.align 4
.globl C(R_Surf16Patch)
C(R_Surf16Patch):
pushl %ebx

movl C(colormap),%eax
movl $LPatchTable16,%ebx
movl $16,%ecx
LPatchLoop16:
movl (%ebx),%edx
addl $4,%ebx
movl %eax,(%edx)
decl %ecx
jnz LPatchLoop16

popl %ebx

ret


#endif // id386
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