mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 04:42:32 +00:00
0c437492b4
For now, OpenGL and Vulkan renderers are broken as I focused on getting the software renderer working (which was quite tricky to get right). This fixes a couple of issues: the segfault when warping the screen (due to the scene rendering move invalidating the warp buffer), and warp always having 320x200 resolution. There's still the problem of the effect being too subtle at high resolution, but that's just a matter of updating the tables and tweaking the code in D_WarpScreen. Another issue is the Draw functions should probably write directly to the main frame buffer or even one passed in as a parameter. This would remove the need for binding the main buffer at the beginning and end of the frame.
1052 lines
24 KiB
ArmAsm
1052 lines
24 KiB
ArmAsm
/*
|
|
d_draw.S
|
|
|
|
x86 assembly-language horizontal 8-bpp span-drawing 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
|
|
|
|
//----------------------------------------------------------------------
|
|
// 8-bpp horizontal span drawing code for polygons, with no transparency.
|
|
//
|
|
// Assumes there is at least one span in pspans, and that every span
|
|
// contains at least one pixel
|
|
//----------------------------------------------------------------------
|
|
|
|
.text
|
|
|
|
// out-of-line, rarely-needed clamping code
|
|
|
|
LClampHigh0:
|
|
movl C(bbextents),%esi
|
|
jmp LClampReentry0
|
|
LClampHighOrLow0:
|
|
jg LClampHigh0
|
|
xorl %esi,%esi
|
|
jmp LClampReentry0
|
|
|
|
LClampHigh1:
|
|
movl C(bbextentt),%edx
|
|
jmp LClampReentry1
|
|
LClampHighOrLow1:
|
|
jg LClampHigh1
|
|
xorl %edx,%edx
|
|
jmp LClampReentry1
|
|
|
|
LClampLow2:
|
|
movl $2048,%ebp
|
|
jmp LClampReentry2
|
|
LClampHigh2:
|
|
movl C(bbextents),%ebp
|
|
jmp LClampReentry2
|
|
|
|
LClampLow3:
|
|
movl $2048,%ecx
|
|
jmp LClampReentry3
|
|
LClampHigh3:
|
|
movl C(bbextentt),%ecx
|
|
jmp LClampReentry3
|
|
|
|
LClampLow4:
|
|
movl $2048,%eax
|
|
jmp LClampReentry4
|
|
LClampHigh4:
|
|
movl C(bbextents),%eax
|
|
jmp LClampReentry4
|
|
|
|
LClampLow5:
|
|
movl $2048,%ebx
|
|
jmp LClampReentry5
|
|
LClampHigh5:
|
|
movl C(bbextentt),%ebx
|
|
jmp LClampReentry5
|
|
|
|
|
|
#define pspans 4+16
|
|
|
|
.align 4
|
|
.globl C(D_DrawSpans8)
|
|
C(D_DrawSpans8):
|
|
pushl %ebp // preserve caller's stack frame
|
|
pushl %edi
|
|
pushl %esi // preserve register variables
|
|
pushl %ebx
|
|
|
|
//
|
|
// set up scaled-by-8 steps, for 8-long segments; also set up cacheblock
|
|
// and span list pointers
|
|
//
|
|
// TODO: any overlap from rearranging?
|
|
flds C(d_sdivzstepu)
|
|
fmuls C(fp_8)
|
|
movl C(cacheblock),%edx
|
|
flds C(d_tdivzstepu)
|
|
fmuls C(fp_8)
|
|
movl pspans(%esp),%ebx // point to the first span descriptor
|
|
flds C(d_zistepu)
|
|
fmuls C(fp_8)
|
|
movl %edx,C(pbase) // pbase = cacheblock
|
|
fstps C(zi8stepu)
|
|
fstps C(tdivz8stepu)
|
|
fstps C(sdivz8stepu)
|
|
|
|
LSpanLoop:
|
|
//
|
|
// set up the initial s/z, t/z, and 1/z on the FP stack, and generate the
|
|
// initial s and t values
|
|
//
|
|
// FIXME: pipeline FILD?
|
|
fildl espan_t_v(%ebx)
|
|
fildl espan_t_u(%ebx)
|
|
|
|
fld %st(1) // dv | du | dv
|
|
fmuls C(d_sdivzstepv) // dv*d_sdivzstepv | du | dv
|
|
fld %st(1) // du | dv*d_sdivzstepv | du | dv
|
|
fmuls C(d_sdivzstepu) // du*d_sdivzstepu | dv*d_sdivzstepv | du | dv
|
|
fld %st(2) // du | du*d_sdivzstepu | dv*d_sdivzstepv | du | dv
|
|
fmuls C(d_tdivzstepu) // du*d_tdivzstepu | du*d_sdivzstepu |
|
|
// dv*d_sdivzstepv | du | dv
|
|
fxch %st(1) // du*d_sdivzstepu | du*d_tdivzstepu |
|
|
// dv*d_sdivzstepv | du | dv
|
|
faddp %st(0),%st(2) // du*d_tdivzstepu |
|
|
// du*d_sdivzstepu + dv*d_sdivzstepv | du | dv
|
|
fxch %st(1) // du*d_sdivzstepu + dv*d_sdivzstepv |
|
|
// du*d_tdivzstepu | du | dv
|
|
fld %st(3) // dv | du*d_sdivzstepu + dv*d_sdivzstepv |
|
|
// du*d_tdivzstepu | du | dv
|
|
fmuls C(d_tdivzstepv) // dv*d_tdivzstepv |
|
|
// du*d_sdivzstepu + dv*d_sdivzstepv |
|
|
// du*d_tdivzstepu | du | dv
|
|
fxch %st(1) // du*d_sdivzstepu + dv*d_sdivzstepv |
|
|
// dv*d_tdivzstepv | du*d_tdivzstepu | du | dv
|
|
fadds C(d_sdivzorigin) // sdivz = d_sdivzorigin + dv*d_sdivzstepv +
|
|
// du*d_sdivzstepu; stays in %st(2) at end
|
|
fxch %st(4) // dv | dv*d_tdivzstepv | du*d_tdivzstepu | du |
|
|
// s/z
|
|
fmuls C(d_zistepv) // dv*d_zistepv | dv*d_tdivzstepv |
|
|
// du*d_tdivzstepu | du | s/z
|
|
fxch %st(1) // dv*d_tdivzstepv | dv*d_zistepv |
|
|
// du*d_tdivzstepu | du | s/z
|
|
faddp %st(0),%st(2) // dv*d_zistepv |
|
|
// dv*d_tdivzstepv + du*d_tdivzstepu | du | s/z
|
|
fxch %st(2) // du | dv*d_tdivzstepv + du*d_tdivzstepu |
|
|
// dv*d_zistepv | s/z
|
|
fmuls C(d_zistepu) // du*d_zistepu |
|
|
// dv*d_tdivzstepv + du*d_tdivzstepu |
|
|
// dv*d_zistepv | s/z
|
|
fxch %st(1) // dv*d_tdivzstepv + du*d_tdivzstepu |
|
|
// du*d_zistepu | dv*d_zistepv | s/z
|
|
fadds C(d_tdivzorigin) // tdivz = d_tdivzorigin + dv*d_tdivzstepv +
|
|
// du*d_tdivzstepu; stays in %st(1) at end
|
|
fxch %st(2) // dv*d_zistepv | du*d_zistepu | t/z | s/z
|
|
faddp %st(0),%st(1) // dv*d_zistepv + du*d_zistepu | t/z | s/z
|
|
|
|
flds C(fp_64k) // fp_64k | dv*d_zistepv + du*d_zistepu | t/z | s/z
|
|
fxch %st(1) // dv*d_zistepv + du*d_zistepu | fp_64k | t/z | s/z
|
|
fadds C(d_ziorigin) // zi = d_ziorigin + dv*d_zistepv +
|
|
// du*d_zistepu; stays in %st(0) at end
|
|
// 1/z | fp_64k | t/z | s/z
|
|
//
|
|
// calculate and clamp s & t
|
|
//
|
|
fdivr %st(0),%st(1) // 1/z | z*64k | t/z | s/z
|
|
|
|
//
|
|
// point %edi to the first pixel in the span
|
|
//
|
|
movl C(d_viewbuffer),%ecx
|
|
movl espan_t_v(%ebx),%eax
|
|
movl %ebx,C(pspantemp) // preserve spans pointer
|
|
|
|
movl C(tadjust),%edx
|
|
movl C(sadjust),%esi
|
|
movl C(d_scantable)(,%eax,4),%edi // v * d_rowbytes
|
|
addl %ecx,%edi
|
|
movl espan_t_u(%ebx),%ecx
|
|
addl %ecx,%edi // pdest = &pdestspan[scans->u];
|
|
movl espan_t_count(%ebx),%ecx
|
|
|
|
//
|
|
// now start the FDIV for the end of the span
|
|
//
|
|
cmpl $8,%ecx
|
|
ja LSetupNotLast1
|
|
|
|
decl %ecx
|
|
jz LCleanup1 // if only one pixel, no need to start an FDIV
|
|
movl %ecx,C(spancountminus1)
|
|
|
|
// finish up the s and t calcs
|
|
fxch %st(1) // z*64k | 1/z | t/z | s/z
|
|
|
|
fld %st(0) // z*64k | z*64k | 1/z | t/z | s/z
|
|
fmul %st(4),%st(0) // s | z*64k | 1/z | t/z | s/z
|
|
fxch %st(1) // z*64k | s | 1/z | t/z | s/z
|
|
fmul %st(3),%st(0) // t | s | 1/z | t/z | s/z
|
|
fxch %st(1) // s | t | 1/z | t/z | s/z
|
|
fistpl C(s) // 1/z | t | t/z | s/z
|
|
fistpl C(t) // 1/z | t/z | s/z
|
|
|
|
fildl C(spancountminus1)
|
|
|
|
flds C(d_tdivzstepu) // C(d_tdivzstepu) | spancountminus1
|
|
flds C(d_zistepu) // C(d_zistepu) | C(d_tdivzstepu) | spancountminus1
|
|
fmul %st(2),%st(0) // C(d_zistepu)*scm1 | C(d_tdivzstepu) | scm1
|
|
fxch %st(1) // C(d_tdivzstepu) | C(d_zistepu)*scm1 | scm1
|
|
fmul %st(2),%st(0) // C(d_tdivzstepu)*scm1 | C(d_zistepu)*scm1 | scm1
|
|
fxch %st(2) // scm1 | C(d_zistepu)*scm1 | C(d_tdivzstepu)*scm1
|
|
fmuls C(d_sdivzstepu) // C(d_sdivzstepu)*scm1 | C(d_zistepu)*scm1 |
|
|
// C(d_tdivzstepu)*scm1
|
|
fxch %st(1) // C(d_zistepu)*scm1 | C(d_sdivzstepu)*scm1 |
|
|
// C(d_tdivzstepu)*scm1
|
|
faddp %st(0),%st(3) // C(d_sdivzstepu)*scm1 | C(d_tdivzstepu)*scm1
|
|
fxch %st(1) // C(d_tdivzstepu)*scm1 | C(d_sdivzstepu)*scm1
|
|
faddp %st(0),%st(3) // C(d_sdivzstepu)*scm1
|
|
faddp %st(0),%st(3)
|
|
|
|
flds C(fp_64k)
|
|
fdiv %st(1),%st(0) // this is what we've gone to all this trouble to
|
|
// overlap
|
|
jmp LFDIVInFlight1
|
|
|
|
LCleanup1:
|
|
// finish up the s and t calcs
|
|
fxch %st(1) // z*64k | 1/z | t/z | s/z
|
|
|
|
fld %st(0) // z*64k | z*64k | 1/z | t/z | s/z
|
|
fmul %st(4),%st(0) // s | z*64k | 1/z | t/z | s/z
|
|
fxch %st(1) // z*64k | s | 1/z | t/z | s/z
|
|
fmul %st(3),%st(0) // t | s | 1/z | t/z | s/z
|
|
fxch %st(1) // s | t | 1/z | t/z | s/z
|
|
fistpl C(s) // 1/z | t | t/z | s/z
|
|
fistpl C(t) // 1/z | t/z | s/z
|
|
jmp LFDIVInFlight1
|
|
|
|
.align 4
|
|
LSetupNotLast1:
|
|
// finish up the s and t calcs
|
|
fxch %st(1) // z*64k | 1/z | t/z | s/z
|
|
|
|
fld %st(0) // z*64k | z*64k | 1/z | t/z | s/z
|
|
fmul %st(4),%st(0) // s | z*64k | 1/z | t/z | s/z
|
|
fxch %st(1) // z*64k | s | 1/z | t/z | s/z
|
|
fmul %st(3),%st(0) // t | s | 1/z | t/z | s/z
|
|
fxch %st(1) // s | t | 1/z | t/z | s/z
|
|
fistpl C(s) // 1/z | t | t/z | s/z
|
|
fistpl C(t) // 1/z | t/z | s/z
|
|
|
|
fadds C(zi8stepu)
|
|
fxch %st(2)
|
|
fadds C(sdivz8stepu)
|
|
fxch %st(2)
|
|
flds C(tdivz8stepu)
|
|
faddp %st(0),%st(2)
|
|
flds C(fp_64k)
|
|
fdiv %st(1),%st(0) // z = 1/1/z
|
|
// this is what we've gone to all this trouble to
|
|
// overlap
|
|
LFDIVInFlight1:
|
|
|
|
addl C(s),%esi
|
|
addl C(t),%edx
|
|
movl C(bbextents),%ebx
|
|
movl C(bbextentt),%ebp
|
|
cmpl %ebx,%esi
|
|
ja LClampHighOrLow0
|
|
LClampReentry0:
|
|
movl %esi,C(s)
|
|
movl C(pbase),%ebx
|
|
shll $16,%esi
|
|
cmpl %ebp,%edx
|
|
movl %esi,C(sfracf)
|
|
ja LClampHighOrLow1
|
|
LClampReentry1:
|
|
movl %edx,C(t)
|
|
movl C(s),%esi // sfrac = scans->sfrac;
|
|
shll $16,%edx
|
|
movl C(t),%eax // tfrac = scans->tfrac;
|
|
sarl $16,%esi
|
|
movl %edx,C(tfracf)
|
|
|
|
//
|
|
// calculate the texture starting address
|
|
//
|
|
sarl $16,%eax
|
|
movl C(cachewidth),%edx
|
|
imull %edx,%eax // (tfrac >> 16) * cachewidth
|
|
addl %ebx,%esi
|
|
addl %eax,%esi // psource = pbase + (sfrac >> 16) +
|
|
// ((tfrac >> 16) * cachewidth);
|
|
|
|
//
|
|
// determine whether last span or not
|
|
//
|
|
cmpl $8,%ecx
|
|
jna LLastSegment
|
|
|
|
//
|
|
// not the last segment; do full 8-wide segment
|
|
//
|
|
LNotLastSegment:
|
|
|
|
//
|
|
// advance s/z, t/z, and 1/z, and calculate s & t at end of span and steps to
|
|
// get there
|
|
//
|
|
|
|
// pick up after the FDIV that was left in flight previously
|
|
|
|
fld %st(0) // duplicate it
|
|
fmul %st(4),%st(0) // s = s/z * z
|
|
fxch %st(1)
|
|
fmul %st(3),%st(0) // t = t/z * z
|
|
fxch %st(1)
|
|
fistpl C(snext)
|
|
fistpl C(tnext)
|
|
movl C(snext),%eax
|
|
movl C(tnext),%edx
|
|
|
|
movb (%esi),%bl // get first source texel
|
|
subl $8,%ecx // count off this segments' pixels
|
|
movl C(sadjust),%ebp
|
|
movl %ecx,C(counttemp) // remember count of remaining pixels
|
|
|
|
movl C(tadjust),%ecx
|
|
movb %bl,(%edi) // store first dest pixel
|
|
|
|
addl %eax,%ebp
|
|
addl %edx,%ecx
|
|
|
|
movl C(bbextents),%eax
|
|
movl C(bbextentt),%edx
|
|
|
|
cmpl $2048,%ebp
|
|
jl LClampLow2
|
|
cmpl %eax,%ebp
|
|
ja LClampHigh2
|
|
LClampReentry2:
|
|
|
|
cmpl $2048,%ecx
|
|
jl LClampLow3
|
|
cmpl %edx,%ecx
|
|
ja LClampHigh3
|
|
LClampReentry3:
|
|
|
|
movl %ebp,C(snext)
|
|
movl %ecx,C(tnext)
|
|
|
|
subl C(s),%ebp
|
|
subl C(t),%ecx
|
|
|
|
//
|
|
// set up advancetable
|
|
//
|
|
movl %ecx,%eax
|
|
movl %ebp,%edx
|
|
sarl $19,%eax // tstep >>= 16;
|
|
jz LZero
|
|
sarl $19,%edx // sstep >>= 16;
|
|
movl C(cachewidth),%ebx
|
|
imull %ebx,%eax
|
|
jmp LSetUp1
|
|
|
|
LZero:
|
|
sarl $19,%edx // sstep >>= 16;
|
|
movl C(cachewidth),%ebx
|
|
|
|
LSetUp1:
|
|
|
|
addl %edx,%eax // add in sstep
|
|
// (tstep >> 16) * cachewidth + (sstep >> 16);
|
|
movl C(tfracf),%edx
|
|
movl %eax,C(advancetable)+4 // advance base in t
|
|
addl %ebx,%eax // ((tstep >> 16) + 1) * cachewidth +
|
|
// (sstep >> 16);
|
|
shll $13,%ebp // left-justify sstep fractional part
|
|
movl C(sfracf),%ebx
|
|
shll $13,%ecx // left-justify tstep fractional part
|
|
movl %eax,C(advancetable) // advance extra in t
|
|
|
|
movl %ecx,C(tstep)
|
|
addl %ecx,%edx // advance tfrac fractional part by tstep frac
|
|
|
|
sbbl %ecx,%ecx // turn tstep carry into -1 (0 if none)
|
|
addl %ebp,%ebx // advance sfrac fractional part by sstep frac
|
|
adcl C(advancetable)+4(,%ecx,4),%esi // point to next source texel
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb (%esi),%al
|
|
addl %ebp,%ebx
|
|
movb %al,1(%edi)
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,2(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,3(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
|
|
//
|
|
// start FDIV for end of next segment in flight, so it can overlap
|
|
//
|
|
movl C(counttemp),%ecx
|
|
cmpl $8,%ecx // more than one segment after this?
|
|
ja LSetupNotLast2 // yes
|
|
|
|
decl %ecx
|
|
jz LFDIVInFlight2 // if only one pixel, no need to start an FDIV
|
|
movl %ecx,C(spancountminus1)
|
|
fildl C(spancountminus1)
|
|
|
|
flds C(d_zistepu) // C(d_zistepu) | spancountminus1
|
|
fmul %st(1),%st(0) // C(d_zistepu)*scm1 | scm1
|
|
flds C(d_tdivzstepu) // C(d_tdivzstepu) | C(d_zistepu)*scm1 | scm1
|
|
fmul %st(2),%st(0) // C(d_tdivzstepu)*scm1 | C(d_zistepu)*scm1 | scm1
|
|
fxch %st(1) // C(d_zistepu)*scm1 | C(d_tdivzstepu)*scm1 | scm1
|
|
faddp %st(0),%st(3) // C(d_tdivzstepu)*scm1 | scm1
|
|
fxch %st(1) // scm1 | C(d_tdivzstepu)*scm1
|
|
fmuls C(d_sdivzstepu) // C(d_sdivzstepu)*scm1 | C(d_tdivzstepu)*scm1
|
|
fxch %st(1) // C(d_tdivzstepu)*scm1 | C(d_sdivzstepu)*scm1
|
|
faddp %st(0),%st(3) // C(d_sdivzstepu)*scm1
|
|
flds C(fp_64k) // 64k | C(d_sdivzstepu)*scm1
|
|
fxch %st(1) // C(d_sdivzstepu)*scm1 | 64k
|
|
faddp %st(0),%st(4) // 64k
|
|
|
|
fdiv %st(1),%st(0) // this is what we've gone to all this trouble to
|
|
// overlap
|
|
jmp LFDIVInFlight2
|
|
|
|
.align 4
|
|
LSetupNotLast2:
|
|
fadds C(zi8stepu)
|
|
fxch %st(2)
|
|
fadds C(sdivz8stepu)
|
|
fxch %st(2)
|
|
flds C(tdivz8stepu)
|
|
faddp %st(0),%st(2)
|
|
flds C(fp_64k)
|
|
fdiv %st(1),%st(0) // z = 1/1/z
|
|
// this is what we've gone to all this trouble to
|
|
// overlap
|
|
LFDIVInFlight2:
|
|
movl %ecx,C(counttemp)
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,4(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,5(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,6(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl $8,%edi
|
|
movl %edx,C(tfracf)
|
|
movl C(snext),%edx
|
|
movl %ebx,C(sfracf)
|
|
movl C(tnext),%ebx
|
|
movl %edx,C(s)
|
|
movl %ebx,C(t)
|
|
|
|
movl C(counttemp),%ecx // retrieve count
|
|
|
|
//
|
|
// determine whether last span or not
|
|
//
|
|
cmpl $8,%ecx // are there multiple segments remaining?
|
|
movb %al,-1(%edi)
|
|
ja LNotLastSegment // yes
|
|
|
|
//
|
|
// last segment of scan
|
|
//
|
|
LLastSegment:
|
|
|
|
//
|
|
// advance s/z, t/z, and 1/z, and calculate s & t at end of span and steps to
|
|
// get there. The number of pixels left is variable, and we want to land on the
|
|
// last pixel, not step one past it, so we can't run into arithmetic problems
|
|
//
|
|
testl %ecx,%ecx
|
|
jz LNoSteps // just draw the last pixel and we're done
|
|
|
|
// pick up after the FDIV that was left in flight previously
|
|
|
|
|
|
fld %st(0) // duplicate it
|
|
fmul %st(4),%st(0) // s = s/z * z
|
|
fxch %st(1)
|
|
fmul %st(3),%st(0) // t = t/z * z
|
|
fxch %st(1)
|
|
fistpl C(snext)
|
|
fistpl C(tnext)
|
|
|
|
movb (%esi),%al // load first texel in segment
|
|
movl C(tadjust),%ebx
|
|
movb %al,(%edi) // store first pixel in segment
|
|
movl C(sadjust),%eax
|
|
|
|
addl C(snext),%eax
|
|
addl C(tnext),%ebx
|
|
|
|
movl C(bbextents),%ebp
|
|
movl C(bbextentt),%edx
|
|
|
|
cmpl $2048,%eax
|
|
jl LClampLow4
|
|
cmpl %ebp,%eax
|
|
ja LClampHigh4
|
|
LClampReentry4:
|
|
movl %eax,C(snext)
|
|
|
|
cmpl $2048,%ebx
|
|
jl LClampLow5
|
|
cmpl %edx,%ebx
|
|
ja LClampHigh5
|
|
LClampReentry5:
|
|
|
|
cmpl $1,%ecx // don't bother
|
|
je LOnlyOneStep // if two pixels in segment, there's only one step,
|
|
// of the segment length
|
|
subl C(s),%eax
|
|
subl C(t),%ebx
|
|
|
|
addl %eax,%eax // convert to 15.17 format so multiply by 1.31
|
|
addl %ebx,%ebx // reciprocal yields 16.48
|
|
|
|
imull C(reciprocal_table)-8(,%ecx,4) // sstep = (snext - s) / (spancount-1)
|
|
movl %edx,%ebp
|
|
|
|
movl %ebx,%eax
|
|
imull C(reciprocal_table)-8(,%ecx,4) // tstep = (tnext - t) / (spancount-1)
|
|
|
|
LSetEntryvec:
|
|
//
|
|
// set up advancetable
|
|
//
|
|
movl C(entryvec_table)(,%ecx,4),%ebx
|
|
movl %edx,%eax
|
|
movl %ebx,C(jumptemp) // entry point into code for RET later
|
|
movl %ebp,%ecx
|
|
sarl $16,%edx // tstep >>= 16;
|
|
movl C(cachewidth),%ebx
|
|
sarl $16,%ecx // sstep >>= 16;
|
|
imull %ebx,%edx
|
|
|
|
addl %ecx,%edx // add in sstep
|
|
// (tstep >> 16) * cachewidth + (sstep >> 16);
|
|
movl C(tfracf),%ecx
|
|
movl %edx,C(advancetable)+4 // advance base in t
|
|
addl %ebx,%edx // ((tstep >> 16) + 1) * cachewidth +
|
|
// (sstep >> 16);
|
|
shll $16,%ebp // left-justify sstep fractional part
|
|
movl C(sfracf),%ebx
|
|
shll $16,%eax // left-justify tstep fractional part
|
|
movl %edx,C(advancetable) // advance extra in t
|
|
|
|
movl %eax,C(tstep)
|
|
movl %ecx,%edx
|
|
addl %eax,%edx
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
jmp *C(jumptemp) // jump to the number-of-pixels handler
|
|
|
|
//----------------------------------------
|
|
|
|
LNoSteps:
|
|
movb (%esi),%al // load first texel in segment
|
|
subl $7,%edi // adjust for hardwired offset
|
|
jmp LEndSpan
|
|
|
|
|
|
LOnlyOneStep:
|
|
subl C(s),%eax
|
|
subl C(t),%ebx
|
|
movl %eax,%ebp
|
|
movl %ebx,%edx
|
|
jmp LSetEntryvec
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry2_8)
|
|
C(Entry2_8):
|
|
subl $6,%edi // adjust for hardwired offsets
|
|
movb (%esi),%al
|
|
jmp LLEntry2_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry3_8)
|
|
C(Entry3_8):
|
|
subl $5,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
jmp LLEntry3_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry4_8)
|
|
C(Entry4_8):
|
|
subl $4,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
jmp LLEntry4_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry5_8)
|
|
C(Entry5_8):
|
|
subl $3,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
jmp LLEntry5_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry6_8)
|
|
C(Entry6_8):
|
|
subl $2,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
jmp LLEntry6_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry7_8)
|
|
C(Entry7_8):
|
|
decl %edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
jmp LLEntry7_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl C(Entry8_8)
|
|
C(Entry8_8):
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
|
|
addl C(tstep),%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,1(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
LLEntry7_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,2(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
LLEntry6_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,3(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
LLEntry5_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,4(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
addl C(tstep),%edx
|
|
LLEntry4_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,5(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl C(advancetable)+4(,%ecx,4),%esi
|
|
LLEntry3_8:
|
|
movb %al,6(%edi)
|
|
movb (%esi),%al
|
|
LLEntry2_8:
|
|
|
|
LEndSpan:
|
|
|
|
//
|
|
// clear s/z, t/z, 1/z from FP stack
|
|
//
|
|
fstp %st(0)
|
|
fstp %st(0)
|
|
fstp %st(0)
|
|
|
|
movl C(pspantemp),%ebx // restore spans pointer
|
|
movl espan_t_pnext(%ebx),%ebx // point to next span
|
|
testl %ebx,%ebx // any more spans?
|
|
movb %al,7(%edi)
|
|
jnz LSpanLoop // more spans
|
|
|
|
popl %ebx // restore register variables
|
|
popl %esi
|
|
popl %edi
|
|
popl %ebp // restore the caller's stack frame
|
|
ret
|
|
|
|
//----------------------------------------------------------------------
|
|
// 8-bpp horizontal span z drawing codefor polygons, with no transparency.
|
|
//
|
|
// Assumes there is at least one span in pzspans, and that every span
|
|
// contains at least one pixel
|
|
//----------------------------------------------------------------------
|
|
|
|
.text
|
|
|
|
// z-clamp on a non-negative gradient span
|
|
LClamp:
|
|
movl $0x40000000,%edx
|
|
xorl %ebx,%ebx
|
|
fstp %st(0)
|
|
jmp LZDraw
|
|
|
|
// z-clamp on a negative gradient span
|
|
LClampNeg:
|
|
movl $0x40000000,%edx
|
|
xorl %ebx,%ebx
|
|
fstp %st(0)
|
|
jmp LZDrawNeg
|
|
|
|
|
|
#define pzspans 4+16
|
|
|
|
.globl C(D_DrawZSpans)
|
|
C(D_DrawZSpans):
|
|
pushl %ebp // preserve caller's stack frame
|
|
pushl %edi
|
|
pushl %esi // preserve register variables
|
|
pushl %ebx
|
|
|
|
flds C(d_zistepu)
|
|
movl C(d_zistepu),%eax
|
|
movl pzspans(%esp),%esi
|
|
testl %eax,%eax
|
|
jz LFNegSpan
|
|
|
|
fmuls C(Float2ToThe31nd)
|
|
fistpl C(izistep) // note: we are relying on FP exceptions being turned
|
|
// off here to avoid range problems
|
|
movl C(izistep),%ebx // remains loaded for all spans
|
|
|
|
LFSpanLoop:
|
|
// set up the initial 1/z value
|
|
fildl espan_t_v(%esi)
|
|
fildl espan_t_u(%esi)
|
|
movl espan_t_v(%esi),%ecx
|
|
movl C(d_zbuffer),%edi
|
|
fmuls C(d_zistepu)
|
|
fxch %st(1)
|
|
fmuls C(d_zistepv)
|
|
fxch %st(1)
|
|
fadds C(d_ziorigin)
|
|
imull C(d_zrowbytes),%ecx
|
|
faddp %st(0),%st(1)
|
|
|
|
// clamp if z is nearer than 2 (1/z > 0.5)
|
|
fcoms C(float_point5)
|
|
addl %ecx,%edi
|
|
movl espan_t_u(%esi),%edx
|
|
addl %edx,%edx // word count
|
|
movl espan_t_count(%esi),%ecx
|
|
addl %edx,%edi // pdest = &pdestspan[scans->u];
|
|
pushl %esi // preserve spans pointer
|
|
fnstsw %ax
|
|
testb $0x45,%ah
|
|
jz LClamp
|
|
|
|
fmuls C(Float2ToThe31nd)
|
|
fistpl C(izi) // note: we are relying on FP exceptions being turned
|
|
// off here to avoid problems when the span is closer
|
|
// than 1/(2**31)
|
|
movl C(izi),%edx
|
|
|
|
// at this point:
|
|
// %ebx = izistep
|
|
// %ecx = count
|
|
// %edx = izi
|
|
// %edi = pdest
|
|
|
|
LZDraw:
|
|
|
|
// do a single pixel up front, if necessary to dword align the destination
|
|
testl $2,%edi
|
|
jz LFMiddle
|
|
movl %edx,%eax
|
|
addl %ebx,%edx
|
|
shrl $16,%eax
|
|
decl %ecx
|
|
movw %ax,(%edi)
|
|
addl $2,%edi
|
|
|
|
// do middle a pair of aligned dwords at a time
|
|
LFMiddle:
|
|
pushl %ecx
|
|
shrl $1,%ecx // count / 2
|
|
jz LFLast // no aligned dwords to do
|
|
shrl $1,%ecx // (count / 2) / 2
|
|
jnc LFMiddleLoop // even number of aligned dwords to do
|
|
|
|
movl %edx,%eax
|
|
addl %ebx,%edx
|
|
shrl $16,%eax
|
|
movl %edx,%esi
|
|
addl %ebx,%edx
|
|
andl $0xFFFF0000,%esi
|
|
orl %esi,%eax
|
|
movl %eax,(%edi)
|
|
addl $4,%edi
|
|
andl %ecx,%ecx
|
|
jz LFLast
|
|
|
|
LFMiddleLoop:
|
|
movl %edx,%eax
|
|
addl %ebx,%edx
|
|
shrl $16,%eax
|
|
movl %edx,%esi
|
|
addl %ebx,%edx
|
|
andl $0xFFFF0000,%esi
|
|
orl %esi,%eax
|
|
movl %edx,%ebp
|
|
movl %eax,(%edi)
|
|
addl %ebx,%edx
|
|
shrl $16,%ebp
|
|
movl %edx,%esi
|
|
addl %ebx,%edx
|
|
andl $0xFFFF0000,%esi
|
|
orl %esi,%ebp
|
|
movl %ebp,4(%edi) // FIXME: eliminate register contention
|
|
addl $8,%edi
|
|
|
|
decl %ecx
|
|
jnz LFMiddleLoop
|
|
|
|
LFLast:
|
|
popl %ecx // retrieve count
|
|
popl %esi // retrieve span pointer
|
|
|
|
// do the last, unaligned pixel, if there is one
|
|
andl $1,%ecx // is there an odd pixel left to do?
|
|
jz LFSpanDone // no
|
|
shrl $16,%edx
|
|
movw %dx,(%edi) // do the final pixel's z
|
|
|
|
LFSpanDone:
|
|
movl espan_t_pnext(%esi),%esi
|
|
testl %esi,%esi
|
|
jnz LFSpanLoop
|
|
|
|
jmp LFDone
|
|
|
|
LFNegSpan:
|
|
fmuls C(FloatMinus2ToThe31nd)
|
|
fistpl C(izistep) // note: we are relying on FP exceptions being turned
|
|
// off here to avoid range problems
|
|
movl C(izistep),%ebx // remains loaded for all spans
|
|
|
|
LFNegSpanLoop:
|
|
// set up the initial 1/z value
|
|
fildl espan_t_v(%esi)
|
|
fildl espan_t_u(%esi)
|
|
movl espan_t_v(%esi),%ecx
|
|
movl C(d_zbuffer),%edi
|
|
fmuls C(d_zistepu)
|
|
fxch %st(1)
|
|
fmuls C(d_zistepv)
|
|
fxch %st(1)
|
|
fadds C(d_ziorigin)
|
|
imull C(d_zrowbytes),%ecx
|
|
faddp %st(0),%st(1)
|
|
|
|
// clamp if z is nearer than 2 (1/z > 0.5)
|
|
fcoms C(float_point5)
|
|
addl %ecx,%edi
|
|
movl espan_t_u(%esi),%edx
|
|
addl %edx,%edx // word count
|
|
movl espan_t_count(%esi),%ecx
|
|
addl %edx,%edi // pdest = &pdestspan[scans->u];
|
|
pushl %esi // preserve spans pointer
|
|
fnstsw %ax
|
|
testb $0x45,%ah
|
|
jz LClampNeg
|
|
|
|
fmuls C(Float2ToThe31nd)
|
|
fistpl C(izi) // note: we are relying on FP exceptions being turned
|
|
// off here to avoid problems when the span is closer
|
|
// than 1/(2**31)
|
|
movl C(izi),%edx
|
|
|
|
// at this point:
|
|
// %ebx = izistep
|
|
// %ecx = count
|
|
// %edx = izi
|
|
// %edi = pdest
|
|
|
|
LZDrawNeg:
|
|
|
|
// do a single pixel up front, if necessary to dword align the destination
|
|
testl $2,%edi
|
|
jz LFNegMiddle
|
|
movl %edx,%eax
|
|
subl %ebx,%edx
|
|
shrl $16,%eax
|
|
decl %ecx
|
|
movw %ax,(%edi)
|
|
addl $2,%edi
|
|
|
|
// do middle a pair of aligned dwords at a time
|
|
LFNegMiddle:
|
|
pushl %ecx
|
|
shrl $1,%ecx // count / 2
|
|
jz LFNegLast // no aligned dwords to do
|
|
shrl $1,%ecx // (count / 2) / 2
|
|
jnc LFNegMiddleLoop // even number of aligned dwords to do
|
|
|
|
movl %edx,%eax
|
|
subl %ebx,%edx
|
|
shrl $16,%eax
|
|
movl %edx,%esi
|
|
subl %ebx,%edx
|
|
andl $0xFFFF0000,%esi
|
|
orl %esi,%eax
|
|
movl %eax,(%edi)
|
|
addl $4,%edi
|
|
andl %ecx,%ecx
|
|
jz LFNegLast
|
|
|
|
LFNegMiddleLoop:
|
|
movl %edx,%eax
|
|
subl %ebx,%edx
|
|
shrl $16,%eax
|
|
movl %edx,%esi
|
|
subl %ebx,%edx
|
|
andl $0xFFFF0000,%esi
|
|
orl %esi,%eax
|
|
movl %edx,%ebp
|
|
movl %eax,(%edi)
|
|
subl %ebx,%edx
|
|
shrl $16,%ebp
|
|
movl %edx,%esi
|
|
subl %ebx,%edx
|
|
andl $0xFFFF0000,%esi
|
|
orl %esi,%ebp
|
|
movl %ebp,4(%edi) // FIXME: eliminate register contention
|
|
addl $8,%edi
|
|
|
|
decl %ecx
|
|
jnz LFNegMiddleLoop
|
|
|
|
LFNegLast:
|
|
popl %ecx // retrieve count
|
|
popl %esi // retrieve span pointer
|
|
|
|
// do the last, unaligned pixel, if there is one
|
|
andl $1,%ecx // is there an odd pixel left to do?
|
|
jz LFNegSpanDone // no
|
|
shrl $16,%edx
|
|
movw %dx,(%edi) // do the final pixel's z
|
|
|
|
LFNegSpanDone:
|
|
movl espan_t_pnext(%esi),%esi
|
|
testl %esi,%esi
|
|
jnz LFNegSpanLoop
|
|
|
|
LFDone:
|
|
popl %ebx // restore register variables
|
|
popl %esi
|
|
popl %edi
|
|
popl %ebp // restore the caller's stack frame
|
|
ret
|
|
|
|
#endif // USE_INTEL_ASM
|
|
|
|
#if defined(__linux__) && defined(__ELF__)
|
|
.section .note.GNU-stack,"",%progbits
|
|
#endif
|