forked from KolibriOS/kolibrios
839 lines
18 KiB
ArmAsm
839 lines
18 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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// r_drawa.s
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// x86 assembly-language edge clipping and emission 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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// !!! if these are changed, they must be changed in r_draw.c too !!!
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#define FULLY_CLIPPED_CACHED 0x80000000
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#define FRAMECOUNT_MASK 0x7FFFFFFF
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.data
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Ld0: .single 0.0
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Ld1: .single 0.0
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Lstack: .long 0
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Lfp_near_clip: .single NEAR_CLIP
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Lceilv0: .long 0
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Lv: .long 0
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Lu0: .long 0
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Lv0: .long 0
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Lzi0: .long 0
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.text
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//----------------------------------------------------------------------
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// edge clipping code
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//----------------------------------------------------------------------
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#define pv0 4+12
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#define pv1 8+12
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#define clip 12+12
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.align 4
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.globl C(R_ClipEdge)
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C(R_ClipEdge):
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pushl %esi // preserve register variables
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pushl %edi
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pushl %ebx
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movl %esp,Lstack // for clearing the stack later
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// float d0, d1, f;
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// mvertex_t clipvert;
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movl clip(%esp),%ebx
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movl pv0(%esp),%esi
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movl pv1(%esp),%edx
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// if (clip)
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// {
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testl %ebx,%ebx
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jz Lemit
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// do
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// {
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Lcliploop:
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// d0 = DotProduct (pv0->position, clip->normal) - clip->dist;
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// d1 = DotProduct (pv1->position, clip->normal) - clip->dist;
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flds mv_position+0(%esi)
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fmuls cp_normal+0(%ebx)
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flds mv_position+4(%esi)
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fmuls cp_normal+4(%ebx)
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flds mv_position+8(%esi)
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fmuls cp_normal+8(%ebx)
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fxch %st(1)
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faddp %st(0),%st(2) // d0mul2 | d0add0
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flds mv_position+0(%edx)
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fmuls cp_normal+0(%ebx)
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flds mv_position+4(%edx)
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fmuls cp_normal+4(%ebx)
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flds mv_position+8(%edx)
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fmuls cp_normal+8(%ebx)
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fxch %st(1)
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faddp %st(0),%st(2) // d1mul2 | d1add0 | d0mul2 | d0add0
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fxch %st(3) // d0add0 | d1add0 | d0mul2 | d1mul2
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faddp %st(0),%st(2) // d1add0 | dot0 | d1mul2
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faddp %st(0),%st(2) // dot0 | dot1
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fsubs cp_dist(%ebx) // d0 | dot1
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fxch %st(1) // dot1 | d0
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fsubs cp_dist(%ebx) // d1 | d0
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fxch %st(1)
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fstps Ld0
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fstps Ld1
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// if (d0 >= 0)
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// {
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movl Ld0,%eax
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movl Ld1,%ecx
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orl %eax,%ecx
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js Lp2
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// both points are unclipped
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Lcontinue:
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//
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// R_ClipEdge (&clipvert, pv1, clip->next);
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// return;
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// }
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// } while ((clip = clip->next) != NULL);
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movl cp_next(%ebx),%ebx
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testl %ebx,%ebx
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jnz Lcliploop
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// }
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//// add the edge
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// R_EmitEdge (pv0, pv1);
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Lemit:
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//
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// set integer rounding to ceil mode, set to single precision
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//
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// FIXME: do away with by manually extracting integers from floats?
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// FIXME: set less often
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fldcw ceil_cw
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// edge_t *edge, *pcheck;
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// int u_check;
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// float u, u_step;
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// vec3_t local, transformed;
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// float *world;
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// int v, v2, ceilv0;
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// float scale, lzi0, u0, v0;
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// int side;
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// if (r_lastvertvalid)
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// {
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cmpl $0,C(r_lastvertvalid)
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jz LCalcFirst
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// u0 = r_u1;
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// v0 = r_v1;
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// lzi0 = r_lzi1;
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// ceilv0 = r_ceilv1;
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movl C(r_lzi1),%eax
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movl C(r_u1),%ecx
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movl %eax,Lzi0
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movl %ecx,Lu0
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movl C(r_v1),%ecx
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movl C(r_ceilv1),%eax
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movl %ecx,Lv0
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movl %eax,Lceilv0
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jmp LCalcSecond
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// }
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LCalcFirst:
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// else
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// {
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// world = &pv0->position[0];
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call LTransformAndProject // v0 | lzi0 | u0
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fsts Lv0
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fxch %st(2) // u0 | lzi0 | v0
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fstps Lu0 // lzi0 | v0
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fstps Lzi0 // v0
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// ceilv0 = (int)(v0 - 2000) + 2000; // ceil(v0);
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fistpl Lceilv0
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// }
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LCalcSecond:
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// world = &pv1->position[0];
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movl %edx,%esi
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call LTransformAndProject // v1 | lzi1 | u1
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flds Lu0 // u0 | v1 | lzi1 | u1
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fxch %st(3) // u1 | v1 | lzi1 | u0
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flds Lzi0 // lzi0 | u1 | v1 | lzi1 | u0
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fxch %st(3) // lzi1 | u1 | v1 | lzi0 | u0
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flds Lv0 // v0 | lzi1 | u1 | v1 | lzi0 | u0
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fxch %st(3) // v1 | lzi1 | u1 | v0 | lzi0 | u0
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// r_ceilv1 = (int)(r_v1 - 2000) + 2000; // ceil(r_v1);
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fistl C(r_ceilv1)
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fldcw single_cw // put back normal floating-point state
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fsts C(r_v1)
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fxch %st(4) // lzi0 | lzi1 | u1 | v0 | v1 | u0
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// if (r_lzi1 > lzi0)
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// lzi0 = r_lzi1;
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fcom %st(1)
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fnstsw %ax
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testb $1,%ah
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jz LP0
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fstp %st(0)
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fld %st(0)
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LP0:
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fxch %st(1) // lzi1 | lzi0 | u1 | v0 | v1 | u0
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fstps C(r_lzi1) // lzi0 | u1 | v0 | v1 | u0
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fxch %st(1)
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fsts C(r_u1)
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fxch %st(1)
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// if (lzi0 > r_nearzi) // for mipmap finding
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// r_nearzi = lzi0;
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fcoms C(r_nearzi)
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fnstsw %ax
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testb $0x45,%ah
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jnz LP1
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fsts C(r_nearzi)
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LP1:
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// // for right edges, all we want is the effect on 1/z
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// if (r_nearzionly)
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// return;
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movl C(r_nearzionly),%eax
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testl %eax,%eax
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jz LP2
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LPop5AndDone:
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movl C(cacheoffset),%eax
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movl C(r_framecount),%edx
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cmpl $0x7FFFFFFF,%eax
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jz LDoPop
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andl $(FRAMECOUNT_MASK),%edx
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orl $(FULLY_CLIPPED_CACHED),%edx
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movl %edx,C(cacheoffset)
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LDoPop:
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fstp %st(0) // u1 | v0 | v1 | u0
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fstp %st(0) // v0 | v1 | u0
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fstp %st(0) // v1 | u0
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fstp %st(0) // u0
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fstp %st(0)
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jmp Ldone
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LP2:
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// // create the edge
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// if (ceilv0 == r_ceilv1)
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// return; // horizontal edge
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movl Lceilv0,%ebx
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movl C(edge_p),%edi
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movl C(r_ceilv1),%ecx
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movl %edi,%edx
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movl C(r_pedge),%esi
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addl $(et_size),%edx
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cmpl %ecx,%ebx
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jz LPop5AndDone
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movl C(r_pedge),%eax
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movl %eax,et_owner(%edi)
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// side = ceilv0 > r_ceilv1;
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//
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// edge->nearzi = lzi0;
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fstps et_nearzi(%edi) // u1 | v0 | v1 | u0
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// if (side == 1)
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// {
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jc LSide0
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LSide1:
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// // leading edge (go from p2 to p1)
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// u_step = ((u0 - r_u1) / (v0 - r_v1));
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fsubrp %st(0),%st(3) // v0 | v1 | u0-u1
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fsub %st(1),%st(0) // v0-v1 | v1 | u0-u1
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fdivrp %st(0),%st(2) // v1 | ustep
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// r_emitted = 1;
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movl $1,C(r_emitted)
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// edge = edge_p++;
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movl %edx,C(edge_p)
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// pretouch next edge
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movl (%edx),%eax
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// v2 = ceilv0 - 1;
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// v = r_ceilv1;
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movl %ecx,%eax
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leal -1(%ebx),%ecx
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movl %eax,%ebx
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// edge->surfs[0] = 0;
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// edge->surfs[1] = surface_p - surfaces;
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movl C(surface_p),%eax
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movl C(surfaces),%esi
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subl %edx,%edx
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subl %esi,%eax
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shrl $(SURF_T_SHIFT),%eax
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movl %edx,et_surfs(%edi)
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movl %eax,et_surfs+2(%edi)
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subl %esi,%esi
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// u = r_u1 + ((float)v - r_v1) * u_step;
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movl %ebx,Lv
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fildl Lv // v | v1 | ustep
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fsubp %st(0),%st(1) // v-v1 | ustep
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fmul %st(1),%st(0) // (v-v1)*ustep | ustep
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fadds C(r_u1) // u | ustep
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jmp LSideDone
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// }
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LSide0:
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// else
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// {
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// // trailing edge (go from p1 to p2)
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// u_step = ((r_u1 - u0) / (r_v1 - v0));
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fsub %st(3),%st(0) // u1-u0 | v0 | v1 | u0
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fxch %st(2) // v1 | v0 | u1-u0 | u0
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fsub %st(1),%st(0) // v1-v0 | v0 | u1-u0 | u0
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fdivrp %st(0),%st(2) // v0 | ustep | u0
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// r_emitted = 1;
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movl $1,C(r_emitted)
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// edge = edge_p++;
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movl %edx,C(edge_p)
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// pretouch next edge
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movl (%edx),%eax
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// v = ceilv0;
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// v2 = r_ceilv1 - 1;
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decl %ecx
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// edge->surfs[0] = surface_p - surfaces;
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// edge->surfs[1] = 0;
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movl C(surface_p),%eax
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movl C(surfaces),%esi
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subl %edx,%edx
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subl %esi,%eax
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shrl $(SURF_T_SHIFT),%eax
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movl %edx,et_surfs+2(%edi)
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movl %eax,et_surfs(%edi)
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movl $1,%esi
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// u = u0 + ((float)v - v0) * u_step;
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movl %ebx,Lv
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fildl Lv // v | v0 | ustep | u0
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fsubp %st(0),%st(1) // v-v0 | ustep | u0
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fmul %st(1),%st(0) // (v-v0)*ustep | ustep | u0
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faddp %st(0),%st(2) // ustep | u
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fxch %st(1) // u | ustep
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// }
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LSideDone:
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// edge->u_step = u_step*0x100000;
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// edge->u = u*0x100000 + 0xFFFFF;
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fmuls fp_1m // u*0x100000 | ustep
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fxch %st(1) // ustep | u*0x100000
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fmuls fp_1m // ustep*0x100000 | u*0x100000
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fxch %st(1) // u*0x100000 | ustep*0x100000
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fadds fp_1m_minus_1 // u*0x100000 + 0xFFFFF | ustep*0x100000
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fxch %st(1) // ustep*0x100000 | u*0x100000 + 0xFFFFF
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fistpl et_u_step(%edi) // u*0x100000 + 0xFFFFF
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fistpl et_u(%edi)
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// // we need to do this to avoid stepping off the edges if a very nearly
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// // horizontal edge is less than epsilon above a scan, and numeric error
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// // causes it to incorrectly extend to the scan, and the extension of the
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// // line goes off the edge of the screen
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// // FIXME: is this actually needed?
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// if (edge->u < r_refdef.vrect_x_adj_shift20)
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// edge->u = r_refdef.vrect_x_adj_shift20;
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// if (edge->u > r_refdef.vrectright_adj_shift20)
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// edge->u = r_refdef.vrectright_adj_shift20;
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movl et_u(%edi),%eax
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movl C(r_refdef)+rd_vrect_x_adj_shift20,%edx
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cmpl %edx,%eax
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jl LP4
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movl C(r_refdef)+rd_vrectright_adj_shift20,%edx
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cmpl %edx,%eax
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jng LP5
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LP4:
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movl %edx,et_u(%edi)
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movl %edx,%eax
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LP5:
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// // sort the edge in normally
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// u_check = edge->u;
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//
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// if (edge->surfs[0])
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// u_check++; // sort trailers after leaders
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addl %esi,%eax
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// if (!newedges[v] || newedges[v]->u >= u_check)
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// {
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movl C(newedges)(,%ebx,4),%esi
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testl %esi,%esi
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jz LDoFirst
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cmpl %eax,et_u(%esi)
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jl LNotFirst
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LDoFirst:
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// edge->next = newedges[v];
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// newedges[v] = edge;
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movl %esi,et_next(%edi)
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movl %edi,C(newedges)(,%ebx,4)
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jmp LSetRemove
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// }
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LNotFirst:
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// else
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// {
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// pcheck = newedges[v];
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//
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// while (pcheck->next && pcheck->next->u < u_check)
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// pcheck = pcheck->next;
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LFindInsertLoop:
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movl %esi,%edx
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movl et_next(%esi),%esi
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testl %esi,%esi
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jz LInsertFound
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cmpl %eax,et_u(%esi)
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jl LFindInsertLoop
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LInsertFound:
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// edge->next = pcheck->next;
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// pcheck->next = edge;
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movl %esi,et_next(%edi)
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movl %edi,et_next(%edx)
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// }
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LSetRemove:
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// edge->nextremove = removeedges[v2];
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// removeedges[v2] = edge;
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movl C(removeedges)(,%ecx,4),%eax
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movl %edi,C(removeedges)(,%ecx,4)
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movl %eax,et_nextremove(%edi)
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Ldone:
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movl Lstack,%esp // clear temporary variables from stack
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popl %ebx // restore register variables
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popl %edi
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popl %esi
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ret
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// at least one point is clipped
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Lp2:
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testl %eax,%eax
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jns Lp1
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// else
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// {
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// // point 0 is clipped
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// if (d1 < 0)
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// {
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movl Ld1,%eax
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testl %eax,%eax
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jns Lp3
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// // both points are clipped
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// // we do cache fully clipped edges
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// if (!leftclipped)
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movl C(r_leftclipped),%eax
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movl C(r_pedge),%ecx
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testl %eax,%eax
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jnz Ldone
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// r_pedge->framecount = r_framecount;
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movl C(r_framecount),%eax
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andl $(FRAMECOUNT_MASK),%eax
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orl $(FULLY_CLIPPED_CACHED),%eax
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movl %eax,C(cacheoffset)
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// return;
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jmp Ldone
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// }
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|
|
|
Lp1:
|
|
|
|
// // point 0 is unclipped
|
|
// if (d1 >= 0)
|
|
// {
|
|
// // both points are unclipped
|
|
// continue;
|
|
|
|
// // only point 1 is clipped
|
|
|
|
// f = d0 / (d0 - d1);
|
|
flds Ld0
|
|
flds Ld1
|
|
fsubr %st(1),%st(0)
|
|
|
|
// // we don't cache partially clipped edges
|
|
movl $0x7FFFFFFF,C(cacheoffset)
|
|
|
|
fdivrp %st(0),%st(1)
|
|
|
|
subl $(mv_size),%esp // allocate space for clipvert
|
|
|
|
// clipvert.position[0] = pv0->position[0] +
|
|
// f * (pv1->position[0] - pv0->position[0]);
|
|
// clipvert.position[1] = pv0->position[1] +
|
|
// f * (pv1->position[1] - pv0->position[1]);
|
|
// clipvert.position[2] = pv0->position[2] +
|
|
// f * (pv1->position[2] - pv0->position[2]);
|
|
flds mv_position+8(%edx)
|
|
fsubs mv_position+8(%esi)
|
|
flds mv_position+4(%edx)
|
|
fsubs mv_position+4(%esi)
|
|
flds mv_position+0(%edx)
|
|
fsubs mv_position+0(%esi) // 0 | 1 | 2
|
|
|
|
// replace pv1 with the clip point
|
|
movl %esp,%edx
|
|
movl cp_leftedge(%ebx),%eax
|
|
testb %al,%al
|
|
|
|
fmul %st(3),%st(0)
|
|
fxch %st(1) // 1 | 0 | 2
|
|
fmul %st(3),%st(0)
|
|
fxch %st(2) // 2 | 0 | 1
|
|
fmulp %st(0),%st(3) // 0 | 1 | 2
|
|
fadds mv_position+0(%esi)
|
|
fxch %st(1) // 1 | 0 | 2
|
|
fadds mv_position+4(%esi)
|
|
fxch %st(2) // 2 | 0 | 1
|
|
fadds mv_position+8(%esi)
|
|
fxch %st(1) // 0 | 2 | 1
|
|
fstps mv_position+0(%esp) // 2 | 1
|
|
fstps mv_position+8(%esp) // 1
|
|
fstps mv_position+4(%esp)
|
|
|
|
// if (clip->leftedge)
|
|
// {
|
|
jz Ltestright
|
|
|
|
// r_leftclipped = true;
|
|
// r_leftexit = clipvert;
|
|
movl $1,C(r_leftclipped)
|
|
movl mv_position+0(%esp),%eax
|
|
movl %eax,C(r_leftexit)+mv_position+0
|
|
movl mv_position+4(%esp),%eax
|
|
movl %eax,C(r_leftexit)+mv_position+4
|
|
movl mv_position+8(%esp),%eax
|
|
movl %eax,C(r_leftexit)+mv_position+8
|
|
|
|
jmp Lcontinue
|
|
|
|
// }
|
|
|
|
Ltestright:
|
|
// else if (clip->rightedge)
|
|
// {
|
|
testb %ah,%ah
|
|
jz Lcontinue
|
|
|
|
// r_rightclipped = true;
|
|
// r_rightexit = clipvert;
|
|
movl $1,C(r_rightclipped)
|
|
movl mv_position+0(%esp),%eax
|
|
movl %eax,C(r_rightexit)+mv_position+0
|
|
movl mv_position+4(%esp),%eax
|
|
movl %eax,C(r_rightexit)+mv_position+4
|
|
movl mv_position+8(%esp),%eax
|
|
movl %eax,C(r_rightexit)+mv_position+8
|
|
|
|
// }
|
|
//
|
|
// R_ClipEdge (pv0, &clipvert, clip->next);
|
|
// return;
|
|
// }
|
|
jmp Lcontinue
|
|
|
|
// }
|
|
|
|
Lp3:
|
|
|
|
// // only point 0 is clipped
|
|
// r_lastvertvalid = false;
|
|
|
|
movl $0,C(r_lastvertvalid)
|
|
|
|
// f = d0 / (d0 - d1);
|
|
flds Ld0
|
|
flds Ld1
|
|
fsubr %st(1),%st(0)
|
|
|
|
// // we don't cache partially clipped edges
|
|
movl $0x7FFFFFFF,C(cacheoffset)
|
|
|
|
fdivrp %st(0),%st(1)
|
|
|
|
subl $(mv_size),%esp // allocate space for clipvert
|
|
|
|
// clipvert.position[0] = pv0->position[0] +
|
|
// f * (pv1->position[0] - pv0->position[0]);
|
|
// clipvert.position[1] = pv0->position[1] +
|
|
// f * (pv1->position[1] - pv0->position[1]);
|
|
// clipvert.position[2] = pv0->position[2] +
|
|
// f * (pv1->position[2] - pv0->position[2]);
|
|
flds mv_position+8(%edx)
|
|
fsubs mv_position+8(%esi)
|
|
flds mv_position+4(%edx)
|
|
fsubs mv_position+4(%esi)
|
|
flds mv_position+0(%edx)
|
|
fsubs mv_position+0(%esi) // 0 | 1 | 2
|
|
|
|
movl cp_leftedge(%ebx),%eax
|
|
testb %al,%al
|
|
|
|
fmul %st(3),%st(0)
|
|
fxch %st(1) // 1 | 0 | 2
|
|
fmul %st(3),%st(0)
|
|
fxch %st(2) // 2 | 0 | 1
|
|
fmulp %st(0),%st(3) // 0 | 1 | 2
|
|
fadds mv_position+0(%esi)
|
|
fxch %st(1) // 1 | 0 | 2
|
|
fadds mv_position+4(%esi)
|
|
fxch %st(2) // 2 | 0 | 1
|
|
fadds mv_position+8(%esi)
|
|
fxch %st(1) // 0 | 2 | 1
|
|
fstps mv_position+0(%esp) // 2 | 1
|
|
fstps mv_position+8(%esp) // 1
|
|
fstps mv_position+4(%esp)
|
|
|
|
// replace pv0 with the clip point
|
|
movl %esp,%esi
|
|
|
|
// if (clip->leftedge)
|
|
// {
|
|
jz Ltestright2
|
|
|
|
// r_leftclipped = true;
|
|
// r_leftenter = clipvert;
|
|
movl $1,C(r_leftclipped)
|
|
movl mv_position+0(%esp),%eax
|
|
movl %eax,C(r_leftenter)+mv_position+0
|
|
movl mv_position+4(%esp),%eax
|
|
movl %eax,C(r_leftenter)+mv_position+4
|
|
movl mv_position+8(%esp),%eax
|
|
movl %eax,C(r_leftenter)+mv_position+8
|
|
|
|
jmp Lcontinue
|
|
|
|
// }
|
|
|
|
Ltestright2:
|
|
// else if (clip->rightedge)
|
|
// {
|
|
testb %ah,%ah
|
|
jz Lcontinue
|
|
|
|
// r_rightclipped = true;
|
|
// r_rightenter = clipvert;
|
|
movl $1,C(r_rightclipped)
|
|
movl mv_position+0(%esp),%eax
|
|
movl %eax,C(r_rightenter)+mv_position+0
|
|
movl mv_position+4(%esp),%eax
|
|
movl %eax,C(r_rightenter)+mv_position+4
|
|
movl mv_position+8(%esp),%eax
|
|
movl %eax,C(r_rightenter)+mv_position+8
|
|
|
|
// }
|
|
jmp Lcontinue
|
|
|
|
// %esi = vec3_t point to transform and project
|
|
// %edx preserved
|
|
LTransformAndProject:
|
|
|
|
// // transform and project
|
|
// VectorSubtract (world, modelorg, local);
|
|
flds mv_position+0(%esi)
|
|
fsubs C(modelorg)+0
|
|
flds mv_position+4(%esi)
|
|
fsubs C(modelorg)+4
|
|
flds mv_position+8(%esi)
|
|
fsubs C(modelorg)+8
|
|
fxch %st(2) // local[0] | local[1] | local[2]
|
|
|
|
// TransformVector (local, transformed);
|
|
//
|
|
// if (transformed[2] < NEAR_CLIP)
|
|
// transformed[2] = NEAR_CLIP;
|
|
//
|
|
// lzi0 = 1.0 / transformed[2];
|
|
fld %st(0) // local[0] | local[0] | local[1] | local[2]
|
|
fmuls C(vpn)+0 // zm0 | local[0] | local[1] | local[2]
|
|
fld %st(1) // local[0] | zm0 | local[0] | local[1] |
|
|
// local[2]
|
|
fmuls C(vright)+0 // xm0 | zm0 | local[0] | local[1] | local[2]
|
|
fxch %st(2) // local[0] | zm0 | xm0 | local[1] | local[2]
|
|
fmuls C(vup)+0 // ym0 | zm0 | xm0 | local[1] | local[2]
|
|
fld %st(3) // local[1] | ym0 | zm0 | xm0 | local[1] |
|
|
// local[2]
|
|
fmuls C(vpn)+4 // zm1 | ym0 | zm0 | xm0 | local[1] |
|
|
// local[2]
|
|
fld %st(4) // local[1] | zm1 | ym0 | zm0 | xm0 |
|
|
// local[1] | local[2]
|
|
fmuls C(vright)+4 // xm1 | zm1 | ym0 | zm0 | xm0 |
|
|
// local[1] | local[2]
|
|
fxch %st(5) // local[1] | zm1 | ym0 | zm0 | xm0 |
|
|
// xm1 | local[2]
|
|
fmuls C(vup)+4 // ym1 | zm1 | ym0 | zm0 | xm0 |
|
|
// xm1 | local[2]
|
|
fxch %st(1) // zm1 | ym1 | ym0 | zm0 | xm0 |
|
|
// xm1 | local[2]
|
|
faddp %st(0),%st(3) // ym1 | ym0 | zm2 | xm0 | xm1 | local[2]
|
|
fxch %st(3) // xm0 | ym0 | zm2 | ym1 | xm1 | local[2]
|
|
faddp %st(0),%st(4) // ym0 | zm2 | ym1 | xm2 | local[2]
|
|
faddp %st(0),%st(2) // zm2 | ym2 | xm2 | local[2]
|
|
fld %st(3) // local[2] | zm2 | ym2 | xm2 | local[2]
|
|
fmuls C(vpn)+8 // zm3 | zm2 | ym2 | xm2 | local[2]
|
|
fld %st(4) // local[2] | zm3 | zm2 | ym2 | xm2 | local[2]
|
|
fmuls C(vright)+8 // xm3 | zm3 | zm2 | ym2 | xm2 | local[2]
|
|
fxch %st(5) // local[2] | zm3 | zm2 | ym2 | xm2 | xm3
|
|
fmuls C(vup)+8 // ym3 | zm3 | zm2 | ym2 | xm2 | xm3
|
|
fxch %st(1) // zm3 | ym3 | zm2 | ym2 | xm2 | xm3
|
|
faddp %st(0),%st(2) // ym3 | zm4 | ym2 | xm2 | xm3
|
|
fxch %st(4) // xm3 | zm4 | ym2 | xm2 | ym3
|
|
faddp %st(0),%st(3) // zm4 | ym2 | xm4 | ym3
|
|
fxch %st(1) // ym2 | zm4 | xm4 | ym3
|
|
faddp %st(0),%st(3) // zm4 | xm4 | ym4
|
|
|
|
fcoms Lfp_near_clip
|
|
fnstsw %ax
|
|
testb $1,%ah
|
|
jz LNoClip
|
|
fstp %st(0)
|
|
flds Lfp_near_clip
|
|
|
|
LNoClip:
|
|
|
|
fdivrs float_1 // lzi0 | x | y
|
|
fxch %st(1) // x | lzi0 | y
|
|
|
|
// // FIXME: build x/yscale into transform?
|
|
// scale = xscale * lzi0;
|
|
// u0 = (xcenter + scale*transformed[0]);
|
|
flds C(xscale) // xscale | x | lzi0 | y
|
|
fmul %st(2),%st(0) // scale | x | lzi0 | y
|
|
fmulp %st(0),%st(1) // scale*x | lzi0 | y
|
|
fadds C(xcenter) // u0 | lzi0 | y
|
|
|
|
// if (u0 < r_refdef.fvrectx_adj)
|
|
// u0 = r_refdef.fvrectx_adj;
|
|
// if (u0 > r_refdef.fvrectright_adj)
|
|
// u0 = r_refdef.fvrectright_adj;
|
|
// FIXME: use integer compares of floats?
|
|
fcoms C(r_refdef)+rd_fvrectx_adj
|
|
fnstsw %ax
|
|
testb $1,%ah
|
|
jz LClampP0
|
|
fstp %st(0)
|
|
flds C(r_refdef)+rd_fvrectx_adj
|
|
LClampP0:
|
|
fcoms C(r_refdef)+rd_fvrectright_adj
|
|
fnstsw %ax
|
|
testb $0x45,%ah
|
|
jnz LClampP1
|
|
fstp %st(0)
|
|
flds C(r_refdef)+rd_fvrectright_adj
|
|
LClampP1:
|
|
|
|
fld %st(1) // lzi0 | u0 | lzi0 | y
|
|
|
|
// scale = yscale * lzi0;
|
|
// v0 = (ycenter - scale*transformed[1]);
|
|
fmuls C(yscale) // scale | u0 | lzi0 | y
|
|
fmulp %st(0),%st(3) // u0 | lzi0 | scale*y
|
|
fxch %st(2) // scale*y | lzi0 | u0
|
|
fsubrs C(ycenter) // v0 | lzi0 | u0
|
|
|
|
// if (v0 < r_refdef.fvrecty_adj)
|
|
// v0 = r_refdef.fvrecty_adj;
|
|
// if (v0 > r_refdef.fvrectbottom_adj)
|
|
// v0 = r_refdef.fvrectbottom_adj;
|
|
// FIXME: use integer compares of floats?
|
|
fcoms C(r_refdef)+rd_fvrecty_adj
|
|
fnstsw %ax
|
|
testb $1,%ah
|
|
jz LClampP2
|
|
fstp %st(0)
|
|
flds C(r_refdef)+rd_fvrecty_adj
|
|
LClampP2:
|
|
fcoms C(r_refdef)+rd_fvrectbottom_adj
|
|
fnstsw %ax
|
|
testb $0x45,%ah
|
|
jnz LClampP3
|
|
fstp %st(0)
|
|
flds C(r_refdef)+rd_fvrectbottom_adj
|
|
LClampP3:
|
|
ret
|
|
|
|
#endif // id386
|
|
|