2000-05-11 16:03:29 +00:00
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/*
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surf16.S
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(description)
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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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2000-05-11 13:30:04 +00:00
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// surf16.s
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// x86 assembly-language 16 bpp surface block drawing code.
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#include "asm_i386.h"
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#include "quakeasm.h"
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#include "asm_draw.h"
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#if id386
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//----------------------------------------------------------------------
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// Surface block drawer
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//----------------------------------------------------------------------
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.data
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k: .long 0
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loopentry: .long 0
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.align 4
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blockjumptable16:
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.long LEnter2_16
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.long LEnter4_16
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.long 0, LEnter8_16
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.long 0, 0, 0, LEnter16_16
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.text
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.align 4
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.globl C(R_Surf16Start)
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C(R_Surf16Start):
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.align 4
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.globl C(R_DrawSurfaceBlock16)
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C(R_DrawSurfaceBlock16):
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pushl %ebp // preserve caller's stack frame
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pushl %edi
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pushl %esi // preserve register variables
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pushl %ebx
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movl C(blocksize),%eax
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movl C(prowdestbase),%edi
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movl C(pbasesource),%esi
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movl C(sourcesstep),%ebx
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movl blockjumptable16-4(,%eax,2),%ecx
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movl %eax,k
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movl %ecx,loopentry
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movl C(lightleft),%edx
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movl C(lightright),%ebp
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Lblockloop16:
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subl %edx,%ebp
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movb C(blockdivshift),%cl
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sarl %cl,%ebp
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jns Lp1_16
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testl C(blockdivmask),%ebp
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jz Lp1_16
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incl %ebp
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Lp1_16:
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subl %eax,%eax
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subl %ecx,%ecx // high words must be 0 in loop for addressing
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jmp *loopentry
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.align 4
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#include "block16.h"
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movl C(pbasesource),%esi
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movl C(lightleft),%edx
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movl C(lightright),%ebp
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movl C(sourcetstep),%eax
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movl C(lightrightstep),%ecx
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movl C(prowdestbase),%edi
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addl %eax,%esi
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addl %ecx,%ebp
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movl C(lightleftstep),%eax
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movl C(surfrowbytes),%ecx
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addl %eax,%edx
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addl %ecx,%edi
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movl %esi,C(pbasesource)
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movl %ebp,C(lightright)
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movl k,%eax
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movl %edx,C(lightleft)
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decl %eax
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movl %edi,C(prowdestbase)
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movl %eax,k
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jnz Lblockloop16
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popl %ebx // restore register variables
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popl %esi
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popl %edi
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popl %ebp // restore the caller's stack frame
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ret
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.globl C(R_Surf16End)
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C(R_Surf16End):
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//----------------------------------------------------------------------
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// Code patching routines
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//----------------------------------------------------------------------
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.data
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.align 4
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LPatchTable16:
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.long LBPatch0-4
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.long LBPatch1-4
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.long LBPatch2-4
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.long LBPatch3-4
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.long LBPatch4-4
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.long LBPatch5-4
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.long LBPatch6-4
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.long LBPatch7-4
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.long LBPatch8-4
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.long LBPatch9-4
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.long LBPatch10-4
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.long LBPatch11-4
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.long LBPatch12-4
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.long LBPatch13-4
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.long LBPatch14-4
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.long LBPatch15-4
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.text
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.align 4
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.globl C(R_Surf16Patch)
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C(R_Surf16Patch):
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pushl %ebx
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movl C(colormap),%eax
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movl $LPatchTable16,%ebx
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movl $16,%ecx
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LPatchLoop16:
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movl (%ebx),%edx
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addl $4,%ebx
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movl %eax,(%edx)
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decl %ecx
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jnz LPatchLoop16
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popl %ebx
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ret
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#endif // id386
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