mirror of
https://git.code.sf.net/p/quake/quakeforge-old
synced 2024-11-12 23:44:21 +00:00
c3f5581b0a
Unchained, Ultimate, Ultra, Up Yours, Underworld, Underground, Unified, Unity, etc. You know the drill. This takes care of the "standalone" problem with the wrong name, and the recent snafu with multiple developers working on the same files simultaneously...expect me (and probably others) to start locking dirs when updates are taking place. And yes, this update is really as large as it looks. Software only at the moment, but I will have the makefile updated to build the GL builds as well.
1037 lines
24 KiB
ArmAsm
1037 lines
24 KiB
ArmAsm
/*
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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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//
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// d_draw.s
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// x86 assembly-language horizontal 8-bpp span-drawing code.
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//
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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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#include "d_ifacea.h"
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#if id386
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//----------------------------------------------------------------------
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// 8-bpp horizontal span drawing code for polygons, with no transparency.
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//
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// Assumes there is at least one span in pspans, and that every span
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// contains at least one pixel
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//----------------------------------------------------------------------
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.text
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// out-of-line, rarely-needed clamping code
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LClampHigh0:
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movl C(bbextents),%esi
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jmp LClampReentry0
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LClampHighOrLow0:
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jg LClampHigh0
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xorl %esi,%esi
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jmp LClampReentry0
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LClampHigh1:
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movl C(bbextentt),%edx
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jmp LClampReentry1
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LClampHighOrLow1:
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jg LClampHigh1
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xorl %edx,%edx
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jmp LClampReentry1
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LClampLow2:
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movl $2048,%ebp
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jmp LClampReentry2
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LClampHigh2:
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movl C(bbextents),%ebp
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jmp LClampReentry2
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LClampLow3:
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movl $2048,%ecx
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jmp LClampReentry3
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LClampHigh3:
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movl C(bbextentt),%ecx
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jmp LClampReentry3
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LClampLow4:
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movl $2048,%eax
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jmp LClampReentry4
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LClampHigh4:
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movl C(bbextents),%eax
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jmp LClampReentry4
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LClampLow5:
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movl $2048,%ebx
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jmp LClampReentry5
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LClampHigh5:
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movl C(bbextentt),%ebx
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jmp LClampReentry5
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#define pspans 4+16
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.align 4
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.globl C(D_DrawSpans8)
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C(D_DrawSpans8):
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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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//
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// set up scaled-by-8 steps, for 8-long segments; also set up cacheblock
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// and span list pointers
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//
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// TODO: any overlap from rearranging?
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flds C(d_sdivzstepu)
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fmuls fp_8
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movl C(cacheblock),%edx
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flds C(d_tdivzstepu)
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fmuls fp_8
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movl pspans(%esp),%ebx // point to the first span descriptor
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flds C(d_zistepu)
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fmuls fp_8
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movl %edx,pbase // pbase = cacheblock
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fstps zi8stepu
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fstps tdivz8stepu
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fstps sdivz8stepu
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LSpanLoop:
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//
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// set up the initial s/z, t/z, and 1/z on the FP stack, and generate the
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// initial s and t values
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//
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// FIXME: pipeline FILD?
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fildl espan_t_v(%ebx)
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fildl espan_t_u(%ebx)
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fld %st(1) // dv | du | dv
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fmuls C(d_sdivzstepv) // dv*d_sdivzstepv | du | dv
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fld %st(1) // du | dv*d_sdivzstepv | du | dv
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fmuls C(d_sdivzstepu) // du*d_sdivzstepu | dv*d_sdivzstepv | du | dv
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fld %st(2) // du | du*d_sdivzstepu | dv*d_sdivzstepv | du | dv
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fmuls C(d_tdivzstepu) // du*d_tdivzstepu | du*d_sdivzstepu |
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// dv*d_sdivzstepv | du | dv
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fxch %st(1) // du*d_sdivzstepu | du*d_tdivzstepu |
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// dv*d_sdivzstepv | du | dv
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faddp %st(0),%st(2) // du*d_tdivzstepu |
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// du*d_sdivzstepu + dv*d_sdivzstepv | du | dv
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fxch %st(1) // du*d_sdivzstepu + dv*d_sdivzstepv |
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// du*d_tdivzstepu | du | dv
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fld %st(3) // dv | du*d_sdivzstepu + dv*d_sdivzstepv |
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// du*d_tdivzstepu | du | dv
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fmuls C(d_tdivzstepv) // dv*d_tdivzstepv |
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// du*d_sdivzstepu + dv*d_sdivzstepv |
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// du*d_tdivzstepu | du | dv
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fxch %st(1) // du*d_sdivzstepu + dv*d_sdivzstepv |
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// dv*d_tdivzstepv | du*d_tdivzstepu | du | dv
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fadds C(d_sdivzorigin) // sdivz = d_sdivzorigin + dv*d_sdivzstepv +
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// du*d_sdivzstepu; stays in %st(2) at end
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fxch %st(4) // dv | dv*d_tdivzstepv | du*d_tdivzstepu | du |
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// s/z
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fmuls C(d_zistepv) // dv*d_zistepv | dv*d_tdivzstepv |
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// du*d_tdivzstepu | du | s/z
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fxch %st(1) // dv*d_tdivzstepv | dv*d_zistepv |
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// du*d_tdivzstepu | du | s/z
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faddp %st(0),%st(2) // dv*d_zistepv |
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// dv*d_tdivzstepv + du*d_tdivzstepu | du | s/z
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fxch %st(2) // du | dv*d_tdivzstepv + du*d_tdivzstepu |
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// dv*d_zistepv | s/z
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fmuls C(d_zistepu) // du*d_zistepu |
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// dv*d_tdivzstepv + du*d_tdivzstepu |
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// dv*d_zistepv | s/z
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fxch %st(1) // dv*d_tdivzstepv + du*d_tdivzstepu |
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// du*d_zistepu | dv*d_zistepv | s/z
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fadds C(d_tdivzorigin) // tdivz = d_tdivzorigin + dv*d_tdivzstepv +
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// du*d_tdivzstepu; stays in %st(1) at end
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fxch %st(2) // dv*d_zistepv | du*d_zistepu | t/z | s/z
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faddp %st(0),%st(1) // dv*d_zistepv + du*d_zistepu | t/z | s/z
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flds fp_64k // fp_64k | dv*d_zistepv + du*d_zistepu | t/z | s/z
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fxch %st(1) // dv*d_zistepv + du*d_zistepu | fp_64k | t/z | s/z
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fadds C(d_ziorigin) // zi = d_ziorigin + dv*d_zistepv +
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// du*d_zistepu; stays in %st(0) at end
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// 1/z | fp_64k | t/z | s/z
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//
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// calculate and clamp s & t
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//
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fdivr %st(0),%st(1) // 1/z | z*64k | t/z | s/z
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//
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// point %edi to the first pixel in the span
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//
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movl C(d_viewbuffer),%ecx
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movl espan_t_v(%ebx),%eax
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movl %ebx,pspantemp // preserve spans pointer
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movl C(tadjust),%edx
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movl C(sadjust),%esi
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movl C(d_scantable)(,%eax,4),%edi // v * screenwidth
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addl %ecx,%edi
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movl espan_t_u(%ebx),%ecx
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addl %ecx,%edi // pdest = &pdestspan[scans->u];
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movl espan_t_count(%ebx),%ecx
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//
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// now start the FDIV for the end of the span
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//
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cmpl $8,%ecx
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ja LSetupNotLast1
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decl %ecx
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jz LCleanup1 // if only one pixel, no need to start an FDIV
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movl %ecx,spancountminus1
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// finish up the s and t calcs
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fxch %st(1) // z*64k | 1/z | t/z | s/z
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fld %st(0) // z*64k | z*64k | 1/z | t/z | s/z
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fmul %st(4),%st(0) // s | z*64k | 1/z | t/z | s/z
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fxch %st(1) // z*64k | s | 1/z | t/z | s/z
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fmul %st(3),%st(0) // t | s | 1/z | t/z | s/z
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fxch %st(1) // s | t | 1/z | t/z | s/z
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fistpl s // 1/z | t | t/z | s/z
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fistpl t // 1/z | t/z | s/z
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fildl spancountminus1
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flds C(d_tdivzstepu) // C(d_tdivzstepu) | spancountminus1
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flds C(d_zistepu) // C(d_zistepu) | C(d_tdivzstepu) | spancountminus1
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fmul %st(2),%st(0) // C(d_zistepu)*scm1 | C(d_tdivzstepu) | scm1
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fxch %st(1) // C(d_tdivzstepu) | C(d_zistepu)*scm1 | scm1
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fmul %st(2),%st(0) // C(d_tdivzstepu)*scm1 | C(d_zistepu)*scm1 | scm1
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fxch %st(2) // scm1 | C(d_zistepu)*scm1 | C(d_tdivzstepu)*scm1
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fmuls C(d_sdivzstepu) // C(d_sdivzstepu)*scm1 | C(d_zistepu)*scm1 |
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// C(d_tdivzstepu)*scm1
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fxch %st(1) // C(d_zistepu)*scm1 | C(d_sdivzstepu)*scm1 |
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// C(d_tdivzstepu)*scm1
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faddp %st(0),%st(3) // C(d_sdivzstepu)*scm1 | C(d_tdivzstepu)*scm1
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fxch %st(1) // C(d_tdivzstepu)*scm1 | C(d_sdivzstepu)*scm1
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faddp %st(0),%st(3) // C(d_sdivzstepu)*scm1
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faddp %st(0),%st(3)
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flds fp_64k
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fdiv %st(1),%st(0) // this is what we've gone to all this trouble to
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// overlap
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jmp LFDIVInFlight1
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LCleanup1:
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// finish up the s and t calcs
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fxch %st(1) // z*64k | 1/z | t/z | s/z
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fld %st(0) // z*64k | z*64k | 1/z | t/z | s/z
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fmul %st(4),%st(0) // s | z*64k | 1/z | t/z | s/z
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fxch %st(1) // z*64k | s | 1/z | t/z | s/z
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fmul %st(3),%st(0) // t | s | 1/z | t/z | s/z
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fxch %st(1) // s | t | 1/z | t/z | s/z
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fistpl s // 1/z | t | t/z | s/z
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fistpl t // 1/z | t/z | s/z
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jmp LFDIVInFlight1
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.align 4
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LSetupNotLast1:
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// finish up the s and t calcs
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fxch %st(1) // z*64k | 1/z | t/z | s/z
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fld %st(0) // z*64k | z*64k | 1/z | t/z | s/z
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fmul %st(4),%st(0) // s | z*64k | 1/z | t/z | s/z
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fxch %st(1) // z*64k | s | 1/z | t/z | s/z
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fmul %st(3),%st(0) // t | s | 1/z | t/z | s/z
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fxch %st(1) // s | t | 1/z | t/z | s/z
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fistpl s // 1/z | t | t/z | s/z
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fistpl t // 1/z | t/z | s/z
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fadds zi8stepu
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fxch %st(2)
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fadds sdivz8stepu
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fxch %st(2)
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flds tdivz8stepu
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faddp %st(0),%st(2)
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flds fp_64k
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fdiv %st(1),%st(0) // z = 1/1/z
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// this is what we've gone to all this trouble to
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// overlap
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LFDIVInFlight1:
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addl s,%esi
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addl t,%edx
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movl C(bbextents),%ebx
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movl C(bbextentt),%ebp
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cmpl %ebx,%esi
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ja LClampHighOrLow0
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LClampReentry0:
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movl %esi,s
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movl pbase,%ebx
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shll $16,%esi
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cmpl %ebp,%edx
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movl %esi,sfracf
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ja LClampHighOrLow1
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LClampReentry1:
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movl %edx,t
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movl s,%esi // sfrac = scans->sfrac;
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shll $16,%edx
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movl t,%eax // tfrac = scans->tfrac;
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sarl $16,%esi
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movl %edx,tfracf
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//
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// calculate the texture starting address
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//
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sarl $16,%eax
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movl C(cachewidth),%edx
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imull %edx,%eax // (tfrac >> 16) * cachewidth
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addl %ebx,%esi
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addl %eax,%esi // psource = pbase + (sfrac >> 16) +
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// ((tfrac >> 16) * cachewidth);
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//
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// determine whether last span or not
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//
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cmpl $8,%ecx
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jna LLastSegment
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//
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// not the last segment; do full 8-wide segment
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//
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LNotLastSegment:
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//
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// advance s/z, t/z, and 1/z, and calculate s & t at end of span and steps to
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// get there
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//
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// pick up after the FDIV that was left in flight previously
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fld %st(0) // duplicate it
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fmul %st(4),%st(0) // s = s/z * z
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fxch %st(1)
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fmul %st(3),%st(0) // t = t/z * z
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fxch %st(1)
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fistpl snext
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fistpl tnext
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movl snext,%eax
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movl tnext,%edx
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movb (%esi),%bl // get first source texel
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subl $8,%ecx // count off this segments' pixels
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movl C(sadjust),%ebp
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movl %ecx,counttemp // remember count of remaining pixels
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movl C(tadjust),%ecx
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movb %bl,(%edi) // store first dest pixel
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addl %eax,%ebp
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addl %edx,%ecx
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movl C(bbextents),%eax
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movl C(bbextentt),%edx
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cmpl $2048,%ebp
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jl LClampLow2
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cmpl %eax,%ebp
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ja LClampHigh2
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LClampReentry2:
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cmpl $2048,%ecx
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jl LClampLow3
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cmpl %edx,%ecx
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ja LClampHigh3
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LClampReentry3:
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movl %ebp,snext
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movl %ecx,tnext
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subl s,%ebp
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subl t,%ecx
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//
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// set up advancetable
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//
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movl %ecx,%eax
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movl %ebp,%edx
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sarl $19,%eax // tstep >>= 16;
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jz LZero
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sarl $19,%edx // sstep >>= 16;
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movl C(cachewidth),%ebx
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imull %ebx,%eax
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jmp LSetUp1
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LZero:
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sarl $19,%edx // sstep >>= 16;
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movl C(cachewidth),%ebx
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LSetUp1:
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addl %edx,%eax // add in sstep
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// (tstep >> 16) * cachewidth + (sstep >> 16);
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movl tfracf,%edx
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movl %eax,advancetable+4 // advance base in t
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addl %ebx,%eax // ((tstep >> 16) + 1) * cachewidth +
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// (sstep >> 16);
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shll $13,%ebp // left-justify sstep fractional part
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movl sfracf,%ebx
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shll $13,%ecx // left-justify tstep fractional part
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movl %eax,advancetable // advance extra in t
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movl %ecx,tstep
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addl %ecx,%edx // advance tfrac fractional part by tstep frac
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sbbl %ecx,%ecx // turn tstep carry into -1 (0 if none)
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addl %ebp,%ebx // advance sfrac fractional part by sstep frac
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adcl advancetable+4(,%ecx,4),%esi // point to next source texel
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addl tstep,%edx
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sbbl %ecx,%ecx
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movb (%esi),%al
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addl %ebp,%ebx
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movb %al,1(%edi)
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adcl advancetable+4(,%ecx,4),%esi
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addl tstep,%edx
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sbbl %ecx,%ecx
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addl %ebp,%ebx
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movb (%esi),%al
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adcl advancetable+4(,%ecx,4),%esi
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addl tstep,%edx
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sbbl %ecx,%ecx
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movb %al,2(%edi)
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addl %ebp,%ebx
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movb (%esi),%al
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adcl advancetable+4(,%ecx,4),%esi
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addl tstep,%edx
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sbbl %ecx,%ecx
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movb %al,3(%edi)
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addl %ebp,%ebx
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movb (%esi),%al
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adcl advancetable+4(,%ecx,4),%esi
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//
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// start FDIV for end of next segment in flight, so it can overlap
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//
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movl counttemp,%ecx
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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,spancountminus1
|
|
fildl 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 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 zi8stepu
|
|
fxch %st(2)
|
|
fadds sdivz8stepu
|
|
fxch %st(2)
|
|
flds tdivz8stepu
|
|
faddp %st(0),%st(2)
|
|
flds 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,counttemp
|
|
|
|
addl tstep,%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,4(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
|
|
addl tstep,%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,5(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
|
|
addl tstep,%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,6(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
|
|
addl $8,%edi
|
|
movl %edx,tfracf
|
|
movl snext,%edx
|
|
movl %ebx,sfracf
|
|
movl tnext,%ebx
|
|
movl %edx,s
|
|
movl %ebx,t
|
|
|
|
movl 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 snext
|
|
fistpl 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 snext,%eax
|
|
addl tnext,%ebx
|
|
|
|
movl C(bbextents),%ebp
|
|
movl C(bbextentt),%edx
|
|
|
|
cmpl $2048,%eax
|
|
jl LClampLow4
|
|
cmpl %ebp,%eax
|
|
ja LClampHigh4
|
|
LClampReentry4:
|
|
movl %eax,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 s,%eax
|
|
subl t,%ebx
|
|
|
|
addl %eax,%eax // convert to 15.17 format so multiply by 1.31
|
|
addl %ebx,%ebx // reciprocal yields 16.48
|
|
|
|
imull reciprocal_table-8(,%ecx,4) // sstep = (snext - s) / (spancount-1)
|
|
movl %edx,%ebp
|
|
|
|
movl %ebx,%eax
|
|
imull reciprocal_table-8(,%ecx,4) // tstep = (tnext - t) / (spancount-1)
|
|
|
|
LSetEntryvec:
|
|
//
|
|
// set up advancetable
|
|
//
|
|
movl entryvec_table(,%ecx,4),%ebx
|
|
movl %edx,%eax
|
|
movl %ebx,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 tfracf,%ecx
|
|
movl %edx,advancetable+4 // advance base in t
|
|
addl %ebx,%edx // ((tstep >> 16) + 1) * cachewidth +
|
|
// (sstep >> 16);
|
|
shll $16,%ebp // left-justify sstep fractional part
|
|
movl sfracf,%ebx
|
|
shll $16,%eax // left-justify tstep fractional part
|
|
movl %edx,advancetable // advance extra in t
|
|
|
|
movl %eax,tstep
|
|
movl %ecx,%edx
|
|
addl %eax,%edx
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
|
|
jmp *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 s,%eax
|
|
subl t,%ebx
|
|
movl %eax,%ebp
|
|
movl %ebx,%edx
|
|
jmp LSetEntryvec
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry2_8
|
|
Entry2_8:
|
|
subl $6,%edi // adjust for hardwired offsets
|
|
movb (%esi),%al
|
|
jmp LLEntry2_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry3_8
|
|
Entry3_8:
|
|
subl $5,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
jmp LLEntry3_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry4_8
|
|
Entry4_8:
|
|
subl $4,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
jmp LLEntry4_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry5_8
|
|
Entry5_8:
|
|
subl $3,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
jmp LLEntry5_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry6_8
|
|
Entry6_8:
|
|
subl $2,%edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
jmp LLEntry6_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry7_8
|
|
Entry7_8:
|
|
decl %edi // adjust for hardwired offsets
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
jmp LLEntry7_8
|
|
|
|
//----------------------------------------
|
|
|
|
.globl Entry8_8
|
|
Entry8_8:
|
|
addl %eax,%edx
|
|
movb (%esi),%al
|
|
sbbl %ecx,%ecx
|
|
addl %ebp,%ebx
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
|
|
addl tstep,%edx
|
|
sbbl %ecx,%ecx
|
|
movb %al,1(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
LLEntry7_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,2(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
LLEntry6_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,3(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
LLEntry5_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,4(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl advancetable+4(,%ecx,4),%esi
|
|
addl tstep,%edx
|
|
LLEntry4_8:
|
|
sbbl %ecx,%ecx
|
|
movb %al,5(%edi)
|
|
addl %ebp,%ebx
|
|
movb (%esi),%al
|
|
adcl 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 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 Float2ToThe31nd
|
|
fistpl izistep // note: we are relying on FP exceptions being turned
|
|
// off here to avoid range problems
|
|
movl 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_pzbuffer),%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 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 Float2ToThe31nd
|
|
fistpl 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 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 FloatMinus2ToThe31nd
|
|
fistpl izistep // note: we are relying on FP exceptions being turned
|
|
// off here to avoid range problems
|
|
movl 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_pzbuffer),%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 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 Float2ToThe31nd
|
|
fistpl 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 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 // id386
|