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https://github.com/id-Software/Quake.git
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The Quake sources as originally release under the GPL license on December 21, 1999
This commit is contained in:
Travis Bradshaw
216
WinQuake/r_aclipa.s
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216
WinQuake/r_aclipa.s
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/*
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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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// r_aliasa.s
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// x86 assembly-language Alias model transform and project 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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.data
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Ltemp0: .long 0
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Ltemp1: .long 0
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.text
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#define pfv0 8+4
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#define pfv1 8+8
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#define out 8+12
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.globl C(R_Alias_clip_bottom)
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C(R_Alias_clip_bottom):
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pushl %esi
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pushl %edi
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movl pfv0(%esp),%esi
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movl pfv1(%esp),%edi
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movl C(r_refdef)+rd_aliasvrectbottom,%eax
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LDoForwardOrBackward:
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movl fv_v+4(%esi),%edx
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movl fv_v+4(%edi),%ecx
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cmpl %ecx,%edx
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jl LDoForward
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movl fv_v+4(%esi),%ecx
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movl fv_v+4(%edi),%edx
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movl pfv0(%esp),%edi
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movl pfv1(%esp),%esi
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LDoForward:
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subl %edx,%ecx
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subl %edx,%eax
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movl %ecx,Ltemp1
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movl %eax,Ltemp0
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fildl Ltemp1
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fildl Ltemp0
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movl out(%esp),%edx
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movl $2,%eax
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fdivp %st(0),%st(1) // scale
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LDo3Forward:
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fildl fv_v+0(%esi) // fv0v0 | scale
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fildl fv_v+0(%edi) // fv1v0 | fv0v0 | scale
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fildl fv_v+4(%esi) // fv0v1 | fv1v0 | fv0v0 | scale
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fildl fv_v+4(%edi) // fv1v1 | fv0v1 | fv1v0 | fv0v0 | scale
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fildl fv_v+8(%esi) // fv0v2 | fv1v1 | fv0v1 | fv1v0 | fv0v0 | scale
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fildl fv_v+8(%edi) // fv1v2 | fv0v2 | fv1v1 | fv0v1 | fv1v0 | fv0v0 |
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// scale
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fxch %st(5) // fv0v0 | fv0v2 | fv1v1 | fv0v1 | fv1v0 | fv1v2 |
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// scale
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fsubr %st(0),%st(4) // fv0v0 | fv0v2 | fv1v1 | fv0v1 | fv1v0-fv0v0 |
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// fv1v2 | scale
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fxch %st(3) // fv0v1 | fv0v2 | fv1v1 | fv0v0 | fv1v0-fv0v0 |
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// fv1v2 | scale
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fsubr %st(0),%st(2) // fv0v1 | fv0v2 | fv1v1-fv0v1 | fv0v0 |
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// fv1v0-fv0v0 | fv1v2 | scale
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fxch %st(1) // fv0v2 | fv0v1 | fv1v1-fv0v1 | fv0v0 |
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// fv1v0-fv0v0 | fv1v2 | scale
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fsubr %st(0),%st(5) // fv0v2 | fv0v1 | fv1v1-fv0v1 | fv0v0 |
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// fv1v0-fv0v0 | fv1v2-fv0v2 | scale
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fxch %st(6) // scale | fv0v1 | fv1v1-fv0v1 | fv0v0 |
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// fv1v0-fv0v0 | fv1v2-fv0v2 | fv0v2
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fmul %st(0),%st(4) // scale | fv0v1 | fv1v1-fv0v1 | fv0v0 |
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// (fv1v0-fv0v0)*scale | fv1v2-fv0v2 | fv0v2
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addl $12,%edi
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fmul %st(0),%st(2) // scale | fv0v1 | (fv1v1-fv0v1)*scale | fv0v0 |
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// (fv1v0-fv0v0)*scale | fv1v2-fv0v2 | fv0v2
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addl $12,%esi
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addl $12,%edx
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fmul %st(0),%st(5) // scale | fv0v1 | (fv1v1-fv0v1)*scale | fv0v0 |
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// (fv1v0-fv0v0)*scale | (fv1v2-fv0v2)*scale |
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// fv0v2
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fxch %st(3) // fv0v0 | fv0v1 | (fv1v1-fv0v1)*scale | scale |
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// (fv1v0-fv0v0)*scale | (fv1v2-fv0v2)*scale |
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// fv0v2
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faddp %st(0),%st(4) // fv0v1 | (fv1v1-fv0v1)*scale | scale |
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// fv0v0+(fv1v0-fv0v0)*scale |
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// (fv1v2-fv0v2)*scale | fv0v2
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faddp %st(0),%st(1) // fv0v1+(fv1v1-fv0v1)*scale | scale |
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// fv0v0+(fv1v0-fv0v0)*scale |
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// (fv1v2-fv0v2)*scale | fv0v2
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fxch %st(4) // fv0v2 | scale | fv0v0+(fv1v0-fv0v0)*scale |
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// (fv1v2-fv0v2)*scale | fv0v1+(fv1v1-fv0v1)*scale
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faddp %st(0),%st(3) // scale | fv0v0+(fv1v0-fv0v0)*scale |
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// fv0v2+(fv1v2-fv0v2)*scale |
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// fv0v1+(fv1v1-fv0v1)*scale
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fxch %st(1) // fv0v0+(fv1v0-fv0v0)*scale | scale |
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// fv0v2+(fv1v2-fv0v2)*scale |
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// fv0v1+(fv1v1-fv0v1)*scale
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fadds float_point5
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fxch %st(3) // fv0v1+(fv1v1-fv0v1)*scale | scale |
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// fv0v2+(fv1v2-fv0v2)*scale |
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// fv0v0+(fv1v0-fv0v0)*scale
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fadds float_point5
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fxch %st(2) // fv0v2+(fv1v2-fv0v2)*scale | scale |
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// fv0v1+(fv1v1-fv0v1)*scale |
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// fv0v0+(fv1v0-fv0v0)*scale
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fadds float_point5
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fxch %st(3) // fv0v0+(fv1v0-fv0v0)*scale | scale |
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// fv0v1+(fv1v1-fv0v1)*scale |
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// fv0v2+(fv1v2-fv0v2)*scale
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fistpl fv_v+0-12(%edx) // scale | fv0v1+(fv1v1-fv0v1)*scale |
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// fv0v2+(fv1v2-fv0v2)*scale
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fxch %st(1) // fv0v1+(fv1v1-fv0v1)*scale | scale |
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// fv0v2+(fv1v2-fv0v2)*scale | scale
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fistpl fv_v+4-12(%edx) // scale | fv0v2+(fv1v2-fv0v2)*scale
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fxch %st(1) // fv0v2+(fv1v2-fv0v2)*sc | scale
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fistpl fv_v+8-12(%edx) // scale
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decl %eax
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jnz LDo3Forward
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fstp %st(0)
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popl %edi
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popl %esi
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ret
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.globl C(R_Alias_clip_top)
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C(R_Alias_clip_top):
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pushl %esi
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pushl %edi
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movl pfv0(%esp),%esi
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movl pfv1(%esp),%edi
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movl C(r_refdef)+rd_aliasvrect+4,%eax
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jmp LDoForwardOrBackward
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.globl C(R_Alias_clip_right)
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C(R_Alias_clip_right):
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pushl %esi
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pushl %edi
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movl pfv0(%esp),%esi
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movl pfv1(%esp),%edi
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movl C(r_refdef)+rd_aliasvrectright,%eax
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LRightLeftEntry:
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movl fv_v+4(%esi),%edx
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movl fv_v+4(%edi),%ecx
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cmpl %ecx,%edx
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movl fv_v+0(%esi),%edx
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movl fv_v+0(%edi),%ecx
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jl LDoForward2
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movl fv_v+0(%esi),%ecx
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movl fv_v+0(%edi),%edx
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movl pfv0(%esp),%edi
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movl pfv1(%esp),%esi
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LDoForward2:
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jmp LDoForward
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.globl C(R_Alias_clip_left)
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C(R_Alias_clip_left):
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pushl %esi
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pushl %edi
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movl pfv0(%esp),%esi
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movl pfv1(%esp),%edi
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movl C(r_refdef)+rd_aliasvrect+0,%eax
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jmp LRightLeftEntry
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#endif // id386
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