mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-14 08:50:58 +00:00
5477352e93
I'd been considering it for a while, but in the end, all the issues it presented made me decide it wasn't worth merging and was never really worth keeping: it was a neat proof of concept but of little actual use, especially now everyone either has an OK GPU or would want to stick to 8-bit rendering anyway (sorry L-Havoc). However, both it and my merge work are preserved in git history :)
799 lines
14 KiB
ArmAsm
799 lines
14 KiB
ArmAsm
/*
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surf8.S
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Intel x86 assembly-language 8bpp surface block drawing 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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#include "asm_i386.h"
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#include "quakeasm.h"
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#include "asm_draw.h"
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#ifdef PIC
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#undef USE_INTEL_ASM //XXX asm pic hack
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#endif
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#ifdef USE_INTEL_ASM
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.data
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sb_v: .long 0
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.text
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.align 4
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.globl C(R_Surf8Start)
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C(R_Surf8Start):
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//----------------------------------------------------------------------
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// Surface block drawer for mip level 0
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//----------------------------------------------------------------------
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.align 4
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.globl C(R_DrawSurfaceBlock_mip0)
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C(R_DrawSurfaceBlock_mip0):
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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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// for (v=0 ; v<numvblocks ; v++)
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// {
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movl C(r_lightptr),%ebx
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movl C(r_numvblocks),%eax
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movl %eax,sb_v
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movl C(prowdestbase),%edi
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movl C(pbasesource),%esi
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Lv_loop_mip0:
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// lightleft = lightptr[0];
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// lightright = lightptr[1];
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// lightdelta = (lightleft - lightright) & 0xFFFFF;
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movl (%ebx),%eax // lightleft
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movl 4(%ebx),%edx // lightright
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movl %eax,%ebp
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movl C(r_lightwidth),%ecx
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movl %edx,C(lightright)
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subl %edx,%ebp
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andl $0xFFFFF,%ebp
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leal (%ebx,%ecx,4),%ebx
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// lightptr += lightwidth;
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movl %ebx,C(r_lightptr)
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// lightleftstep = (lightptr[0] - lightleft) >> blockdivshift;
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// lightrightstep = (lightptr[1] - lightright) >> blockdivshift;
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// lightdeltastep = ((lightleftstep - lightrightstep) & 0xFFFFF) |
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// 0xF0000000;
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movl 4(%ebx),%ecx // lightptr[1]
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movl (%ebx),%ebx // lightptr[0]
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subl %eax,%ebx
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subl %edx,%ecx
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sarl $4,%ecx
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orl $0xF0000000,%ebp
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sarl $4,%ebx
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movl %ecx,C(lightrightstep)
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subl %ecx,%ebx
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andl $0xFFFFF,%ebx
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orl $0xF0000000,%ebx
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subl %ecx,%ecx // high word must be 0 in loop for addressing
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movl %ebx,C(lightdeltastep)
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subl %ebx,%ebx // high word must be 0 in loop for addressing
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Lblockloop8_mip0:
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movl %ebp,C(lightdelta)
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movb 14(%esi),%cl
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sarl $4,%ebp
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movb %dh,%bh
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movb 15(%esi),%bl
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addl %ebp,%edx
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch0:
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movb 13(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch1:
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movb 12(%esi),%cl
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movb %dh,%bh
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addl %ebp,%edx
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rorl $16,%eax
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch2:
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movb 11(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch3:
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movb 10(%esi),%cl
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movl %eax,12(%edi)
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movb %dh,%bh
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addl %ebp,%edx
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch4:
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movb 9(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch5:
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movb 8(%esi),%cl
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movb %dh,%bh
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addl %ebp,%edx
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rorl $16,%eax
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch6:
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movb 7(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch7:
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movb 6(%esi),%cl
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movl %eax,8(%edi)
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movb %dh,%bh
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addl %ebp,%edx
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch8:
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movb 5(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch9:
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movb 4(%esi),%cl
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movb %dh,%bh
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addl %ebp,%edx
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rorl $16,%eax
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch10:
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movb 3(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch11:
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movb 2(%esi),%cl
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movl %eax,4(%edi)
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movb %dh,%bh
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addl %ebp,%edx
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch12:
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movb 1(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch13:
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movb (%esi),%cl
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movb %dh,%bh
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addl %ebp,%edx
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rorl $16,%eax
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movb %dh,%ch
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movb 0x12345678(%ebx),%ah
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LBPatch14:
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movl C(lightright),%edx
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movb 0x12345678(%ecx),%al
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LBPatch15:
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movl C(lightdelta),%ebp
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movl %eax,(%edi)
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addl C(sourcetstep),%esi
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addl C(surfrowbytes),%edi
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addl C(lightrightstep),%edx
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addl C(lightdeltastep),%ebp
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movl %edx,C(lightright)
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jc Lblockloop8_mip0
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// if (pbasesource >= r_sourcemax)
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// pbasesource -= stepback;
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cmpl C(r_sourcemax),%esi
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jb LSkip_mip0
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subl C(r_stepback),%esi
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LSkip_mip0:
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movl C(r_lightptr),%ebx
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decl sb_v
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jnz Lv_loop_mip0
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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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//----------------------------------------------------------------------
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// Surface block drawer for mip level 1
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//----------------------------------------------------------------------
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.align 4
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.globl C(R_DrawSurfaceBlock_mip1)
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C(R_DrawSurfaceBlock_mip1):
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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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// for (v=0 ; v<numvblocks ; v++)
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// {
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movl C(r_lightptr),%ebx
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movl C(r_numvblocks),%eax
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movl %eax,sb_v
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movl C(prowdestbase),%edi
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movl C(pbasesource),%esi
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Lv_loop_mip1:
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// lightleft = lightptr[0];
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// lightright = lightptr[1];
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// lightdelta = (lightleft - lightright) & 0xFFFFF;
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movl (%ebx),%eax // lightleft
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movl 4(%ebx),%edx // lightright
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movl %eax,%ebp
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movl C(r_lightwidth),%ecx
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movl %edx,C(lightright)
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subl %edx,%ebp
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andl $0xFFFFF,%ebp
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leal (%ebx,%ecx,4),%ebx
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// lightptr += lightwidth;
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movl %ebx,C(r_lightptr)
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// lightleftstep = (lightptr[0] - lightleft) >> blockdivshift;
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// lightrightstep = (lightptr[1] - lightright) >> blockdivshift;
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// lightdeltastep = ((lightleftstep - lightrightstep) & 0xFFFFF) |
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// 0xF0000000;
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movl 4(%ebx),%ecx // lightptr[1]
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movl (%ebx),%ebx // lightptr[0]
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subl %eax,%ebx
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subl %edx,%ecx
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sarl $3,%ecx
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orl $0x70000000,%ebp
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sarl $3,%ebx
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movl %ecx,C(lightrightstep)
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subl %ecx,%ebx
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andl $0xFFFFF,%ebx
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orl $0xF0000000,%ebx
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subl %ecx,%ecx // high word must be 0 in loop for addressing
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movl %ebx,C(lightdeltastep)
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subl %ebx,%ebx // high word must be 0 in loop for addressing
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Lblockloop8_mip1:
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movl %ebp,C(lightdelta)
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movb 6(%esi),%cl
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sarl $3,%ebp
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movb %dh,%bh
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movb 7(%esi),%bl
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addl %ebp,%edx
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch22:
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movb 5(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch23:
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movb 4(%esi),%cl
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movb %dh,%bh
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addl %ebp,%edx
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rorl $16,%eax
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch24:
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movb 3(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch25:
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movb 2(%esi),%cl
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movl %eax,4(%edi)
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movb %dh,%bh
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addl %ebp,%edx
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movb %dh,%ch
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addl %ebp,%edx
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movb 0x12345678(%ebx),%ah
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LBPatch26:
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movb 1(%esi),%bl
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movb 0x12345678(%ecx),%al
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LBPatch27:
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movb (%esi),%cl
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movb %dh,%bh
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addl %ebp,%edx
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rorl $16,%eax
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movb %dh,%ch
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movb 0x12345678(%ebx),%ah
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LBPatch28:
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movl C(lightright),%edx
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movb 0x12345678(%ecx),%al
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LBPatch29:
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movl C(lightdelta),%ebp
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movl %eax,(%edi)
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movl C(sourcetstep),%eax
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addl %eax,%esi
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movl C(surfrowbytes),%eax
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addl %eax,%edi
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movl C(lightrightstep),%eax
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addl %eax,%edx
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movl C(lightdeltastep),%eax
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addl %eax,%ebp
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movl %edx,C(lightright)
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jc Lblockloop8_mip1
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// if (pbasesource >= r_sourcemax)
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// pbasesource -= stepback;
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cmpl C(r_sourcemax),%esi
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jb LSkip_mip1
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subl C(r_stepback),%esi
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LSkip_mip1:
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movl C(r_lightptr),%ebx
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decl sb_v
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jnz Lv_loop_mip1
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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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//----------------------------------------------------------------------
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// Surface block drawer for mip level 2
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//----------------------------------------------------------------------
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.align 4
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.globl C(R_DrawSurfaceBlock_mip2)
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C(R_DrawSurfaceBlock_mip2):
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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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// for (v=0 ; v<numvblocks ; v++)
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// {
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movl C(r_lightptr),%ebx
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movl C(r_numvblocks),%eax
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movl %eax,sb_v
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movl C(prowdestbase),%edi
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movl C(pbasesource),%esi
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Lv_loop_mip2:
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// lightleft = lightptr[0];
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// lightright = lightptr[1];
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// lightdelta = (lightleft - lightright) & 0xFFFFF;
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movl (%ebx),%eax // lightleft
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movl 4(%ebx),%edx // lightright
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movl %eax,%ebp
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movl C(r_lightwidth),%ecx
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movl %edx,C(lightright)
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subl %edx,%ebp
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andl $0xFFFFF,%ebp
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leal (%ebx,%ecx,4),%ebx
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// lightptr += lightwidth;
|
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movl %ebx,C(r_lightptr)
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|
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|
// lightleftstep = (lightptr[0] - lightleft) >> blockdivshift;
|
|
// lightrightstep = (lightptr[1] - lightright) >> blockdivshift;
|
|
// lightdeltastep = ((lightleftstep - lightrightstep) & 0xFFFFF) |
|
|
// 0xF0000000;
|
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movl 4(%ebx),%ecx // lightptr[1]
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movl (%ebx),%ebx // lightptr[0]
|
|
|
|
subl %eax,%ebx
|
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subl %edx,%ecx
|
|
|
|
sarl $2,%ecx
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|
orl $0x30000000,%ebp
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|
|
|
sarl $2,%ebx
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movl %ecx,C(lightrightstep)
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|
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|
subl %ecx,%ebx
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|
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|
andl $0xFFFFF,%ebx
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|
|
|
orl $0xF0000000,%ebx
|
|
subl %ecx,%ecx // high word must be 0 in loop for addressing
|
|
|
|
movl %ebx,C(lightdeltastep)
|
|
subl %ebx,%ebx // high word must be 0 in loop for addressing
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|
|
|
Lblockloop8_mip2:
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|
movl %ebp,C(lightdelta)
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|
movb 2(%esi),%cl
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|
|
|
sarl $2,%ebp
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|
movb %dh,%bh
|
|
|
|
movb 3(%esi),%bl
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|
addl %ebp,%edx
|
|
|
|
movb %dh,%ch
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|
addl %ebp,%edx
|
|
|
|
movb 0x12345678(%ebx),%ah
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|
LBPatch18:
|
|
movb 1(%esi),%bl
|
|
|
|
movb 0x12345678(%ecx),%al
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|
LBPatch19:
|
|
movb (%esi),%cl
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|
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|
movb %dh,%bh
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|
addl %ebp,%edx
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|
|
|
rorl $16,%eax
|
|
movb %dh,%ch
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|
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|
movb 0x12345678(%ebx),%ah
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|
LBPatch20:
|
|
movl C(lightright),%edx
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|
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movb 0x12345678(%ecx),%al
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|
LBPatch21:
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|
movl C(lightdelta),%ebp
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|
movl %eax,(%edi)
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|
movl C(sourcetstep),%eax
|
|
|
|
addl %eax,%esi
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|
movl C(surfrowbytes),%eax
|
|
|
|
addl %eax,%edi
|
|
movl C(lightrightstep),%eax
|
|
|
|
addl %eax,%edx
|
|
movl C(lightdeltastep),%eax
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|
|
addl %eax,%ebp
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|
movl %edx,C(lightright)
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|
|
jc Lblockloop8_mip2
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|
|
|
// if (pbasesource >= r_sourcemax)
|
|
// pbasesource -= stepback;
|
|
|
|
cmpl C(r_sourcemax),%esi
|
|
jb LSkip_mip2
|
|
subl C(r_stepback),%esi
|
|
LSkip_mip2:
|
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|
|
movl C(r_lightptr),%ebx
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|
decl sb_v
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|
|
jnz Lv_loop_mip2
|
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|
|
popl %ebx // restore register variables
|
|
popl %esi
|
|
popl %edi
|
|
popl %ebp // restore the caller's stack frame
|
|
ret
|
|
|
|
|
|
//----------------------------------------------------------------------
|
|
// Surface block drawer for mip level 3
|
|
//----------------------------------------------------------------------
|
|
|
|
.align 4
|
|
.globl C(R_DrawSurfaceBlock_mip3)
|
|
C(R_DrawSurfaceBlock_mip3):
|
|
pushl %ebp // preserve caller's stack frame
|
|
pushl %edi
|
|
pushl %esi // preserve register variables
|
|
pushl %ebx
|
|
|
|
// for (v=0 ; v<numvblocks ; v++)
|
|
// {
|
|
movl C(r_lightptr),%ebx
|
|
movl C(r_numvblocks),%eax
|
|
|
|
movl %eax,sb_v
|
|
movl C(prowdestbase),%edi
|
|
|
|
movl C(pbasesource),%esi
|
|
|
|
Lv_loop_mip3:
|
|
|
|
// lightleft = lightptr[0];
|
|
// lightright = lightptr[1];
|
|
// lightdelta = (lightleft - lightright) & 0xFFFFF;
|
|
movl (%ebx),%eax // lightleft
|
|
movl 4(%ebx),%edx // lightright
|
|
|
|
movl %eax,%ebp
|
|
movl C(r_lightwidth),%ecx
|
|
|
|
movl %edx,C(lightright)
|
|
subl %edx,%ebp
|
|
|
|
andl $0xFFFFF,%ebp
|
|
leal (%ebx,%ecx,4),%ebx
|
|
|
|
movl %ebp,C(lightdelta)
|
|
// lightptr += lightwidth;
|
|
movl %ebx,C(r_lightptr)
|
|
|
|
// lightleftstep = (lightptr[0] - lightleft) >> blockdivshift;
|
|
// lightrightstep = (lightptr[1] - lightright) >> blockdivshift;
|
|
// lightdeltastep = ((lightleftstep - lightrightstep) & 0xFFFFF) |
|
|
// 0xF0000000;
|
|
movl 4(%ebx),%ecx // lightptr[1]
|
|
movl (%ebx),%ebx // lightptr[0]
|
|
|
|
subl %eax,%ebx
|
|
subl %edx,%ecx
|
|
|
|
sarl $1,%ecx
|
|
|
|
sarl $1,%ebx
|
|
movl %ecx,C(lightrightstep)
|
|
|
|
subl %ecx,%ebx
|
|
andl $0xFFFFF,%ebx
|
|
|
|
sarl $1,%ebp
|
|
orl $0xF0000000,%ebx
|
|
|
|
movl %ebx,C(lightdeltastep)
|
|
subl %ebx,%ebx // high word must be 0 in loop for addressing
|
|
|
|
movb 1(%esi),%bl
|
|
subl %ecx,%ecx // high word must be 0 in loop for addressing
|
|
|
|
movb %dh,%bh
|
|
movb (%esi),%cl
|
|
|
|
addl %ebp,%edx
|
|
movb %dh,%ch
|
|
|
|
movb 0x12345678(%ebx),%al
|
|
LBPatch16:
|
|
movl C(lightright),%edx
|
|
|
|
movb %al,1(%edi)
|
|
movb 0x12345678(%ecx),%al
|
|
LBPatch17:
|
|
|
|
movb %al,(%edi)
|
|
movl C(sourcetstep),%eax
|
|
|
|
addl %eax,%esi
|
|
movl C(surfrowbytes),%eax
|
|
|
|
addl %eax,%edi
|
|
movl C(lightdeltastep),%eax
|
|
|
|
movl C(lightdelta),%ebp
|
|
movb (%esi),%cl
|
|
|
|
addl %eax,%ebp
|
|
movl C(lightrightstep),%eax
|
|
|
|
sarl $1,%ebp
|
|
addl %eax,%edx
|
|
|
|
movb %dh,%bh
|
|
movb 1(%esi),%bl
|
|
|
|
addl %ebp,%edx
|
|
movb %dh,%ch
|
|
|
|
movb 0x12345678(%ebx),%al
|
|
LBPatch30:
|
|
movl C(sourcetstep),%edx
|
|
|
|
movb %al,1(%edi)
|
|
movb 0x12345678(%ecx),%al
|
|
LBPatch31:
|
|
|
|
movb %al,(%edi)
|
|
movl C(surfrowbytes),%ebp
|
|
|
|
addl %edx,%esi
|
|
addl %ebp,%edi
|
|
|
|
// if (pbasesource >= r_sourcemax)
|
|
// pbasesource -= stepback;
|
|
|
|
cmpl C(r_sourcemax),%esi
|
|
jb LSkip_mip3
|
|
subl C(r_stepback),%esi
|
|
LSkip_mip3:
|
|
|
|
movl C(r_lightptr),%ebx
|
|
decl sb_v
|
|
|
|
jnz Lv_loop_mip3
|
|
|
|
popl %ebx // restore register variables
|
|
popl %esi
|
|
popl %edi
|
|
popl %ebp // restore the caller's stack frame
|
|
ret
|
|
|
|
|
|
.globl C(R_Surf8End)
|
|
C(R_Surf8End):
|
|
|
|
//----------------------------------------------------------------------
|
|
// Code patching routines
|
|
//----------------------------------------------------------------------
|
|
.data
|
|
|
|
.align 4
|
|
LPatchTable8:
|
|
.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
|
|
.long LBPatch16-4
|
|
.long LBPatch17-4
|
|
.long LBPatch18-4
|
|
.long LBPatch19-4
|
|
.long LBPatch20-4
|
|
.long LBPatch21-4
|
|
.long LBPatch22-4
|
|
.long LBPatch23-4
|
|
.long LBPatch24-4
|
|
.long LBPatch25-4
|
|
.long LBPatch26-4
|
|
.long LBPatch27-4
|
|
.long LBPatch28-4
|
|
.long LBPatch29-4
|
|
.long LBPatch30-4
|
|
.long LBPatch31-4
|
|
|
|
.text
|
|
|
|
.align 4
|
|
.globl C(R_SurfPatch)
|
|
C(R_SurfPatch):
|
|
pushl %ebx
|
|
|
|
movl C(colormap),%eax
|
|
movl $LPatchTable8,%ebx
|
|
movl $32,%ecx
|
|
LPatchLoop8:
|
|
movl (%ebx),%edx
|
|
addl $4,%ebx
|
|
movl %eax,(%edx)
|
|
decl %ecx
|
|
jnz LPatchLoop8
|
|
|
|
popl %ebx
|
|
|
|
ret
|
|
|
|
#endif // USE_INTEL_ASM
|
|
|
|
#if defined(__linux__) && defined(__ELF__)
|
|
.section .note.GNU-stack,"",%progbits
|
|
#endif
|