mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-21 01:50:53 +00:00
881add2c51
Prevents GCC from assuming an executable stack is needed. Signed-off-by: Ionen Wolkens <ionen@gentoo.org>
251 lines
7.1 KiB
ArmAsm
251 lines
7.1 KiB
ArmAsm
/*
|
|
r_aliasa.S
|
|
|
|
x86 assembly-language Alias model transform and project 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 PIC
|
|
#undef USE_INTEL_ASM //XXX asm pic hack
|
|
#endif
|
|
|
|
#ifdef USE_INTEL_ASM
|
|
|
|
.data
|
|
|
|
Lfloat_1: .single 1.0
|
|
Ltemp: .long 0
|
|
Lcoords: .long 0, 0, 0
|
|
|
|
.text
|
|
|
|
#define fv 12+4
|
|
#define pstverts 12+8
|
|
|
|
.globl C(R_AliasTransformAndProjectFinalVerts)
|
|
C(R_AliasTransformAndProjectFinalVerts):
|
|
pushl %ebp // preserve caller's stack frame
|
|
pushl %edi
|
|
pushl %esi // preserve register variables
|
|
|
|
// int i, temp;
|
|
// float lightcos, *plightnormal, zi;
|
|
// trivertx_t *pverts;
|
|
|
|
// pverts = r_apverts;
|
|
movl C(r_apverts),%esi
|
|
|
|
// for (i=0 ; i<r_anumverts ; i++, fv++, pverts++, pstverts++)
|
|
// {
|
|
movl pstverts(%esp),%ebp
|
|
movl fv(%esp),%edi
|
|
movl C(r_anumverts),%ecx
|
|
subl %edx,%edx
|
|
|
|
Lloop:
|
|
|
|
// // transform and project
|
|
// zi = 1.0 / (DotProduct(pverts->v, aliastransform[2]) +
|
|
// aliastransform[2][3]);
|
|
movb (%esi),%dl
|
|
movb %dl,Lcoords
|
|
fildl Lcoords // v[0]
|
|
movb 1(%esi),%dl
|
|
movb %dl,Lcoords+4
|
|
fildl Lcoords+4 // v[1] | v[0]
|
|
movb 2(%esi),%dl
|
|
movb %dl,Lcoords+8
|
|
fildl Lcoords+8 // v[2] | v[1] | v[0]
|
|
|
|
fld %st(2) // v[0] | v[2] | v[1] | v[0]
|
|
fmuls C(aliastransform)+32 // accum | v[2] | v[1] | v[0]
|
|
fld %st(2) // v[1] | accum | v[2] | v[1] | v[0]
|
|
fmuls C(aliastransform)+36 // accum2 | accum | v[2] | v[1] | v[0]
|
|
fxch %st(1) // accum | accum2 | v[2] | v[1] | v[0]
|
|
fadds C(aliastransform)+44 // accum | accum2 | v[2] | v[1] | v[0]
|
|
fld %st(2) // v[2] | accum | accum2 | v[2] | v[1] | v[0]
|
|
fmuls C(aliastransform)+40 // accum3 | accum | accum2 | v[2] | v[1] |
|
|
// v[0]
|
|
fxch %st(1) // accum | accum3 | accum2 | v[2] | v[1] | v[0]
|
|
faddp %st(0),%st(2) // accum3 | accum | v[2] | v[1] | v[0]
|
|
movb tv_lightnormalindex(%esi),%dl
|
|
movl stv_s(%ebp),%eax
|
|
movl %eax,fv_v+8(%edi)
|
|
faddp %st(0),%st(1) // z | v[2] | v[1] | v[0]
|
|
|
|
movl stv_t(%ebp),%eax
|
|
movl %eax,fv_v+12(%edi)
|
|
|
|
// // lighting
|
|
// plightnormal = r_avertexnormals[pverts->lightnormalindex];
|
|
|
|
fdivrs Lfloat_1 // zi | v[2] | v[1] | v[0]
|
|
|
|
// fv->v[2] = pstverts->s;
|
|
// fv->v[3] = pstverts->t;
|
|
// fv->flags = pstverts->onseam;
|
|
movl stv_onseam(%ebp),%eax
|
|
movl %eax,fv_flags(%edi)
|
|
|
|
movl fv_size(%edi),%eax
|
|
movl stv_size(%ebp),%eax
|
|
movl 4(%esi),%eax
|
|
|
|
leal (%edx,%edx,2),%eax // index*3
|
|
|
|
fxch %st(3) // v[0] | v[2] | v[1] | zi
|
|
|
|
// lightcos = DotProduct (plightnormal, r_plightvec);
|
|
flds C(r_avertexnormals)(,%eax,4)
|
|
fmuls C(r_plightvec)
|
|
flds C(r_avertexnormals)+4(,%eax,4)
|
|
fmuls C(r_plightvec)+4
|
|
flds C(r_avertexnormals)+8(,%eax,4)
|
|
fmuls C(r_plightvec)+8
|
|
fxch %st(1)
|
|
faddp %st(0),%st(2)
|
|
fld %st(2) // v[0] | laccum | laccum2 | v[0] | v[2] |
|
|
// v[1] | zi
|
|
fmuls C(aliastransform)+0 // xaccum | laccum | laccum2 | v[0] | v[2] |
|
|
// v[1] | zi
|
|
fxch %st(2) // laccum2 | laccum | xaccum | v[0] | v[2] |
|
|
// v[1] | zi
|
|
faddp %st(0),%st(1) // laccum | xaccum | v[0] | v[2] | v[1] | zi
|
|
|
|
// temp = r_ambientlight;
|
|
// if (lightcos < 0)
|
|
// {
|
|
fsts Ltemp
|
|
movl C(r_ambientlight),%eax
|
|
movb Ltemp+3,%dl
|
|
testb $0x80,%dl
|
|
jz Lsavelight // no need to clamp if only ambient lit, because
|
|
// r_ambientlight is preclamped
|
|
|
|
// temp += (int)(r_shadelight * lightcos);
|
|
fmuls C(r_shadelight)
|
|
// FIXME: fast float->int conversion?
|
|
fistpl Ltemp
|
|
addl Ltemp,%eax
|
|
|
|
// // clamp; because we limited the minimum ambient and shading light, we
|
|
// // don't have to clamp low light, just bright
|
|
// if (temp < 0)
|
|
// temp = 0;
|
|
jns Lp1
|
|
subl %eax,%eax
|
|
|
|
// }
|
|
|
|
Lp1:
|
|
|
|
// fv->v[4] = temp;
|
|
//
|
|
// // x, y, and z are scaled down by 1/2**31 in the transform, so 1/z is
|
|
// // scaled up by 1/2**31, and the scaling cancels out for x and y in the
|
|
// // projection
|
|
// fv->v[0] = ((DotProduct(pverts->v, aliastransform[0]) +
|
|
// aliastransform[0][3]) * zi) + aliasxcenter;
|
|
// fv->v[1] = ((DotProduct(pverts->v, aliastransform[1]) +
|
|
// aliastransform[1][3]) * zi) + aliasycenter;
|
|
// fv->v[5] = zi;
|
|
fxch %st(1) // v[0] | xaccum | v[2] | v[1] | zi
|
|
fmuls C(aliastransform)+16 // yaccum | xaccum | v[2] | v[1] | zi
|
|
fxch %st(3) // v[1] | xaccum | v[2] | yaccum | zi
|
|
fld %st(0) // v[1] | v[1] | xaccum | v[2] | yaccum | zi
|
|
fmuls C(aliastransform)+4 // xaccum2 | v[1] | xaccum | v[2] | yaccum |zi
|
|
fxch %st(1) // v[1] | xaccum2 | xaccum | v[2] | yaccum |zi
|
|
movl %eax,fv_v+16(%edi)
|
|
fmuls C(aliastransform)+20 // yaccum2 | xaccum2 | xaccum | v[2] | yaccum|
|
|
// zi
|
|
fxch %st(2) // xaccum | xaccum2 | yaccum2 | v[2] | yaccum|
|
|
// zi
|
|
fadds C(aliastransform)+12 // xaccum | xaccum2 | yaccum2 | v[2] | yaccum|
|
|
// zi
|
|
fxch %st(4) // yaccum | xaccum2 | yaccum2 | v[2] | xaccum|
|
|
// zi
|
|
fadds C(aliastransform)+28 // yaccum | xaccum2 | yaccum2 | v[2] | xaccum|
|
|
// zi
|
|
fxch %st(3) // v[2] | xaccum2 | yaccum2 | yaccum | xaccum|
|
|
// zi
|
|
fld %st(0) // v[2] | v[2] | xaccum2 | yaccum2 | yaccum |
|
|
// xaccum | zi
|
|
fmuls C(aliastransform)+8 // xaccum3 | v[2] | xaccum2 | yaccum2 |yaccum|
|
|
// xaccum | zi
|
|
fxch %st(1) // v[2] | xaccum3 | xaccum2 | yaccum2 |yaccum|
|
|
// xaccum | zi
|
|
fmuls C(aliastransform)+24 // yaccum3 | xaccum3 | xaccum2 | yaccum2 |
|
|
// yaccum | xaccum | zi
|
|
fxch %st(5) // xaccum | xaccum3 | xaccum2 | yaccum2 |
|
|
// yaccum | yaccum3 | zi
|
|
faddp %st(0),%st(2) // xaccum3 | xaccum | yaccum2 | yaccum |
|
|
// yaccum3 | zi
|
|
fxch %st(3) // yaccum | xaccum | yaccum2 | xaccum3 |
|
|
// yaccum3 | zi
|
|
faddp %st(0),%st(2) // xaccum | yaccum | xaccum3 | yaccum3 | zi
|
|
addl $(tv_size),%esi
|
|
faddp %st(0),%st(2) // yaccum | x | yaccum3 | zi
|
|
faddp %st(0),%st(2) // x | y | zi
|
|
addl $(stv_size),%ebp
|
|
fmul %st(2),%st(0) // x/z | y | zi
|
|
fxch %st(1) // y | x/z | zi
|
|
fmul %st(2),%st(0) // y/z | x/z | zi
|
|
fxch %st(1) // x/z | y/z | zi
|
|
fadds C(aliasxcenter) // u | y/z | zi
|
|
fxch %st(1) // y/z | u | zi
|
|
fadds C(aliasycenter) // v | u | zi
|
|
fxch %st(2) // zi | u | v
|
|
// FIXME: fast float->int conversion?
|
|
fistpl fv_v+20(%edi) // u | v
|
|
fistpl fv_v+0(%edi) // v
|
|
fistpl fv_v+4(%edi)
|
|
|
|
// }
|
|
|
|
addl $(fv_size),%edi
|
|
decl %ecx
|
|
jnz Lloop
|
|
|
|
popl %esi // restore register variables
|
|
popl %edi
|
|
popl %ebp // restore the caller's stack frame
|
|
ret
|
|
|
|
Lsavelight:
|
|
fstp %st(0)
|
|
jmp Lp1
|
|
|
|
#endif // USE_INTEL_ASM
|
|
|
|
#if defined(__linux__) && defined(__ELF__)
|
|
.section .note.GNU-stack,"",%progbits
|
|
#endif
|