838 lines
18 KiB
ArmAsm
838 lines
18 KiB
ArmAsm
/*
|
|
Copyright (C) 1996-1997 Id Software, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
*/
|
|
//
|
|
// r_drawa.s
|
|
// x86 assembly-language edge clipping and emission code
|
|
//
|
|
|
|
#include "asm_i386.h"
|
|
#include "quakeasm.h"
|
|
#include "asm_draw.h"
|
|
#include "d_ifacea.h"
|
|
|
|
#if id386
|
|
|
|
// !!! if these are changed, they must be changed in r_draw.c too !!!
|
|
#define FULLY_CLIPPED_CACHED 0x80000000
|
|
#define FRAMECOUNT_MASK 0x7FFFFFFF
|
|
|
|
.data
|
|
|
|
Ld0: .single 0.0
|
|
Ld1: .single 0.0
|
|
Lstack: .long 0
|
|
Lfp_near_clip: .single NEAR_CLIP
|
|
Lceilv0: .long 0
|
|
Lv: .long 0
|
|
Lu0: .long 0
|
|
Lv0: .long 0
|
|
Lzi0: .long 0
|
|
|
|
.text
|
|
|
|
//----------------------------------------------------------------------
|
|
// edge clipping code
|
|
//----------------------------------------------------------------------
|
|
|
|
#define pv0 4+12
|
|
#define pv1 8+12
|
|
#define clip 12+12
|
|
|
|
.align 4
|
|
.globl C(R_ClipEdge)
|
|
C(R_ClipEdge):
|
|
pushl %esi // preserve register variables
|
|
pushl %edi
|
|
pushl %ebx
|
|
movl %esp,Lstack // for clearing the stack later
|
|
|
|
// float d0, d1, f;
|
|
// mvertex_t clipvert;
|
|
|
|
movl clip(%esp),%ebx
|
|
movl pv0(%esp),%esi
|
|
movl pv1(%esp),%edx
|
|
|
|
// if (clip)
|
|
// {
|
|
testl %ebx,%ebx
|
|
jz Lemit
|
|
|
|
// do
|
|
// {
|
|
|
|
Lcliploop:
|
|
|
|
// d0 = DotProduct (pv0->position, clip->normal) - clip->dist;
|
|
// d1 = DotProduct (pv1->position, clip->normal) - clip->dist;
|
|
flds mv_position+0(%esi)
|
|
fmuls cp_normal+0(%ebx)
|
|
flds mv_position+4(%esi)
|
|
fmuls cp_normal+4(%ebx)
|
|
flds mv_position+8(%esi)
|
|
fmuls cp_normal+8(%ebx)
|
|
fxch %st(1)
|
|
faddp %st(0),%st(2) // d0mul2 | d0add0
|
|
|
|
flds mv_position+0(%edx)
|
|
fmuls cp_normal+0(%ebx)
|
|
flds mv_position+4(%edx)
|
|
fmuls cp_normal+4(%ebx)
|
|
flds mv_position+8(%edx)
|
|
fmuls cp_normal+8(%ebx)
|
|
fxch %st(1)
|
|
faddp %st(0),%st(2) // d1mul2 | d1add0 | d0mul2 | d0add0
|
|
fxch %st(3) // d0add0 | d1add0 | d0mul2 | d1mul2
|
|
|
|
faddp %st(0),%st(2) // d1add0 | dot0 | d1mul2
|
|
faddp %st(0),%st(2) // dot0 | dot1
|
|
|
|
fsubs cp_dist(%ebx) // d0 | dot1
|
|
fxch %st(1) // dot1 | d0
|
|
fsubs cp_dist(%ebx) // d1 | d0
|
|
fxch %st(1)
|
|
fstps Ld0
|
|
fstps Ld1
|
|
|
|
// if (d0 >= 0)
|
|
// {
|
|
movl Ld0,%eax
|
|
movl Ld1,%ecx
|
|
orl %eax,%ecx
|
|
js Lp2
|
|
|
|
// both points are unclipped
|
|
|
|
Lcontinue:
|
|
|
|
//
|
|
// R_ClipEdge (&clipvert, pv1, clip->next);
|
|
// return;
|
|
// }
|
|
// } while ((clip = clip->next) != NULL);
|
|
movl cp_next(%ebx),%ebx
|
|
testl %ebx,%ebx
|
|
jnz Lcliploop
|
|
|
|
// }
|
|
|
|
//// add the edge
|
|
// R_EmitEdge (pv0, pv1);
|
|
Lemit:
|
|
|
|
//
|
|
// set integer rounding to ceil mode, set to single precision
|
|
//
|
|
// FIXME: do away with by manually extracting integers from floats?
|
|
// FIXME: set less often
|
|
fldcw ceil_cw
|
|
|
|
// edge_t *edge, *pcheck;
|
|
// int u_check;
|
|
// float u, u_step;
|
|
// vec3_t local, transformed;
|
|
// float *world;
|
|
// int v, v2, ceilv0;
|
|
// float scale, lzi0, u0, v0;
|
|
// int side;
|
|
|
|
// if (r_lastvertvalid)
|
|
// {
|
|
cmpl $0,C(r_lastvertvalid)
|
|
jz LCalcFirst
|
|
|
|
// u0 = r_u1;
|
|
// v0 = r_v1;
|
|
// lzi0 = r_lzi1;
|
|
// ceilv0 = r_ceilv1;
|
|
movl C(r_lzi1),%eax
|
|
movl C(r_u1),%ecx
|
|
movl %eax,Lzi0
|
|
movl %ecx,Lu0
|
|
movl C(r_v1),%ecx
|
|
movl C(r_ceilv1),%eax
|
|
movl %ecx,Lv0
|
|
movl %eax,Lceilv0
|
|
jmp LCalcSecond
|
|
|
|
// }
|
|
|
|
LCalcFirst:
|
|
|
|
// else
|
|
// {
|
|
// world = &pv0->position[0];
|
|
|
|
call LTransformAndProject // v0 | lzi0 | u0
|
|
|
|
fsts Lv0
|
|
fxch %st(2) // u0 | lzi0 | v0
|
|
fstps Lu0 // lzi0 | v0
|
|
fstps Lzi0 // v0
|
|
|
|
// ceilv0 = (int)(v0 - 2000) + 2000; // ceil(v0);
|
|
fistpl Lceilv0
|
|
|
|
// }
|
|
|
|
LCalcSecond:
|
|
|
|
// world = &pv1->position[0];
|
|
movl %edx,%esi
|
|
|
|
call LTransformAndProject // v1 | lzi1 | u1
|
|
|
|
flds Lu0 // u0 | v1 | lzi1 | u1
|
|
fxch %st(3) // u1 | v1 | lzi1 | u0
|
|
flds Lzi0 // lzi0 | u1 | v1 | lzi1 | u0
|
|
fxch %st(3) // lzi1 | u1 | v1 | lzi0 | u0
|
|
flds Lv0 // v0 | lzi1 | u1 | v1 | lzi0 | u0
|
|
fxch %st(3) // v1 | lzi1 | u1 | v0 | lzi0 | u0
|
|
|
|
// r_ceilv1 = (int)(r_v1 - 2000) + 2000; // ceil(r_v1);
|
|
fistl C(r_ceilv1)
|
|
|
|
fldcw single_cw // put back normal floating-point state
|
|
|
|
fsts C(r_v1)
|
|
fxch %st(4) // lzi0 | lzi1 | u1 | v0 | v1 | u0
|
|
|
|
// if (r_lzi1 > lzi0)
|
|
// lzi0 = r_lzi1;
|
|
fcom %st(1)
|
|
fnstsw %ax
|
|
testb $1,%ah
|
|
jz LP0
|
|
fstp %st(0)
|
|
fld %st(0)
|
|
LP0:
|
|
|
|
fxch %st(1) // lzi1 | lzi0 | u1 | v0 | v1 | u0
|
|
fstps C(r_lzi1) // lzi0 | u1 | v0 | v1 | u0
|
|
fxch %st(1)
|
|
fsts C(r_u1)
|
|
fxch %st(1)
|
|
|
|
// if (lzi0 > r_nearzi) // for mipmap finding
|
|
// r_nearzi = lzi0;
|
|
fcoms C(r_nearzi)
|
|
fnstsw %ax
|
|
testb $0x45,%ah
|
|
jnz LP1
|
|
fsts C(r_nearzi)
|
|
LP1:
|
|
|
|
// // for right edges, all we want is the effect on 1/z
|
|
// if (r_nearzionly)
|
|
// return;
|
|
movl C(r_nearzionly),%eax
|
|
testl %eax,%eax
|
|
jz LP2
|
|
LPop5AndDone:
|
|
movl C(cacheoffset),%eax
|
|
movl C(r_framecount),%edx
|
|
cmpl $0x7FFFFFFF,%eax
|
|
jz LDoPop
|
|
andl $(FRAMECOUNT_MASK),%edx
|
|
orl $(FULLY_CLIPPED_CACHED),%edx
|
|
movl %edx,C(cacheoffset)
|
|
|
|
LDoPop:
|
|
fstp %st(0) // u1 | v0 | v1 | u0
|
|
fstp %st(0) // v0 | v1 | u0
|
|
fstp %st(0) // v1 | u0
|
|
fstp %st(0) // u0
|
|
fstp %st(0)
|
|
jmp Ldone
|
|
|
|
LP2:
|
|
|
|
// // create the edge
|
|
// if (ceilv0 == r_ceilv1)
|
|
// return; // horizontal edge
|
|
movl Lceilv0,%ebx
|
|
movl C(edge_p),%edi
|
|
movl C(r_ceilv1),%ecx
|
|
movl %edi,%edx
|
|
movl C(r_pedge),%esi
|
|
addl $(et_size),%edx
|
|
cmpl %ecx,%ebx
|
|
jz LPop5AndDone
|
|
|
|
movl C(r_pedge),%eax
|
|
movl %eax,et_owner(%edi)
|
|
|
|
// side = ceilv0 > r_ceilv1;
|
|
//
|
|
// edge->nearzi = lzi0;
|
|
fstps et_nearzi(%edi) // u1 | v0 | v1 | u0
|
|
|
|
// if (side == 1)
|
|
// {
|
|
jc LSide0
|
|
|
|
LSide1:
|
|
|
|
// // leading edge (go from p2 to p1)
|
|
|
|
// u_step = ((u0 - r_u1) / (v0 - r_v1));
|
|
fsubrp %st(0),%st(3) // v0 | v1 | u0-u1
|
|
fsub %st(1),%st(0) // v0-v1 | v1 | u0-u1
|
|
fdivrp %st(0),%st(2) // v1 | ustep
|
|
|
|
// r_emitted = 1;
|
|
movl $1,C(r_emitted)
|
|
|
|
// edge = edge_p++;
|
|
movl %edx,C(edge_p)
|
|
|
|
// pretouch next edge
|
|
movl (%edx),%eax
|
|
|
|
// v2 = ceilv0 - 1;
|
|
// v = r_ceilv1;
|
|
movl %ecx,%eax
|
|
leal -1(%ebx),%ecx
|
|
movl %eax,%ebx
|
|
|
|
// edge->surfs[0] = 0;
|
|
// edge->surfs[1] = surface_p - surfaces;
|
|
movl C(surface_p),%eax
|
|
movl C(surfaces),%esi
|
|
subl %edx,%edx
|
|
subl %esi,%eax
|
|
shrl $(SURF_T_SHIFT),%eax
|
|
movl %edx,et_surfs(%edi)
|
|
movl %eax,et_surfs+2(%edi)
|
|
|
|
subl %esi,%esi
|
|
|
|
// u = r_u1 + ((float)v - r_v1) * u_step;
|
|
movl %ebx,Lv
|
|
fildl Lv // v | v1 | ustep
|
|
fsubp %st(0),%st(1) // v-v1 | ustep
|
|
fmul %st(1),%st(0) // (v-v1)*ustep | ustep
|
|
fadds C(r_u1) // u | ustep
|
|
|
|
jmp LSideDone
|
|
|
|
// }
|
|
|
|
LSide0:
|
|
|
|
// else
|
|
// {
|
|
// // trailing edge (go from p1 to p2)
|
|
|
|
// u_step = ((r_u1 - u0) / (r_v1 - v0));
|
|
fsub %st(3),%st(0) // u1-u0 | v0 | v1 | u0
|
|
fxch %st(2) // v1 | v0 | u1-u0 | u0
|
|
fsub %st(1),%st(0) // v1-v0 | v0 | u1-u0 | u0
|
|
fdivrp %st(0),%st(2) // v0 | ustep | u0
|
|
|
|
// r_emitted = 1;
|
|
movl $1,C(r_emitted)
|
|
|
|
// edge = edge_p++;
|
|
movl %edx,C(edge_p)
|
|
|
|
// pretouch next edge
|
|
movl (%edx),%eax
|
|
|
|
// v = ceilv0;
|
|
// v2 = r_ceilv1 - 1;
|
|
decl %ecx
|
|
|
|
// edge->surfs[0] = surface_p - surfaces;
|
|
// edge->surfs[1] = 0;
|
|
movl C(surface_p),%eax
|
|
movl C(surfaces),%esi
|
|
subl %edx,%edx
|
|
subl %esi,%eax
|
|
shrl $(SURF_T_SHIFT),%eax
|
|
movl %edx,et_surfs+2(%edi)
|
|
movl %eax,et_surfs(%edi)
|
|
|
|
movl $1,%esi
|
|
|
|
// u = u0 + ((float)v - v0) * u_step;
|
|
movl %ebx,Lv
|
|
fildl Lv // v | v0 | ustep | u0
|
|
fsubp %st(0),%st(1) // v-v0 | ustep | u0
|
|
fmul %st(1),%st(0) // (v-v0)*ustep | ustep | u0
|
|
faddp %st(0),%st(2) // ustep | u
|
|
fxch %st(1) // u | ustep
|
|
|
|
// }
|
|
|
|
LSideDone:
|
|
|
|
// edge->u_step = u_step*0x100000;
|
|
// edge->u = u*0x100000 + 0xFFFFF;
|
|
|
|
fmuls fp_1m // u*0x100000 | ustep
|
|
fxch %st(1) // ustep | u*0x100000
|
|
fmuls fp_1m // ustep*0x100000 | u*0x100000
|
|
fxch %st(1) // u*0x100000 | ustep*0x100000
|
|
fadds fp_1m_minus_1 // u*0x100000 + 0xFFFFF | ustep*0x100000
|
|
fxch %st(1) // ustep*0x100000 | u*0x100000 + 0xFFFFF
|
|
fistpl et_u_step(%edi) // u*0x100000 + 0xFFFFF
|
|
fistpl et_u(%edi)
|
|
|
|
// // we need to do this to avoid stepping off the edges if a very nearly
|
|
// // horizontal edge is less than epsilon above a scan, and numeric error
|
|
// // causes it to incorrectly extend to the scan, and the extension of the
|
|
// // line goes off the edge of the screen
|
|
// // FIXME: is this actually needed?
|
|
// if (edge->u < r_refdef.vrect_x_adj_shift20)
|
|
// edge->u = r_refdef.vrect_x_adj_shift20;
|
|
// if (edge->u > r_refdef.vrectright_adj_shift20)
|
|
// edge->u = r_refdef.vrectright_adj_shift20;
|
|
movl et_u(%edi),%eax
|
|
movl C(r_refdef)+rd_vrect_x_adj_shift20,%edx
|
|
cmpl %edx,%eax
|
|
jl LP4
|
|
movl C(r_refdef)+rd_vrectright_adj_shift20,%edx
|
|
cmpl %edx,%eax
|
|
jng LP5
|
|
LP4:
|
|
movl %edx,et_u(%edi)
|
|
movl %edx,%eax
|
|
LP5:
|
|
|
|
// // sort the edge in normally
|
|
// u_check = edge->u;
|
|
//
|
|
// if (edge->surfs[0])
|
|
// u_check++; // sort trailers after leaders
|
|
addl %esi,%eax
|
|
|
|
// if (!newedges[v] || newedges[v]->u >= u_check)
|
|
// {
|
|
movl C(newedges)(,%ebx,4),%esi
|
|
testl %esi,%esi
|
|
jz LDoFirst
|
|
cmpl %eax,et_u(%esi)
|
|
jl LNotFirst
|
|
LDoFirst:
|
|
|
|
// edge->next = newedges[v];
|
|
// newedges[v] = edge;
|
|
movl %esi,et_next(%edi)
|
|
movl %edi,C(newedges)(,%ebx,4)
|
|
|
|
jmp LSetRemove
|
|
|
|
// }
|
|
|
|
LNotFirst:
|
|
|
|
// else
|
|
// {
|
|
// pcheck = newedges[v];
|
|
//
|
|
// while (pcheck->next && pcheck->next->u < u_check)
|
|
// pcheck = pcheck->next;
|
|
LFindInsertLoop:
|
|
movl %esi,%edx
|
|
movl et_next(%esi),%esi
|
|
testl %esi,%esi
|
|
jz LInsertFound
|
|
cmpl %eax,et_u(%esi)
|
|
jl LFindInsertLoop
|
|
|
|
LInsertFound:
|
|
|
|
// edge->next = pcheck->next;
|
|
// pcheck->next = edge;
|
|
movl %esi,et_next(%edi)
|
|
movl %edi,et_next(%edx)
|
|
|
|
// }
|
|
|
|
LSetRemove:
|
|
|
|
// edge->nextremove = removeedges[v2];
|
|
// removeedges[v2] = edge;
|
|
movl C(removeedges)(,%ecx,4),%eax
|
|
movl %edi,C(removeedges)(,%ecx,4)
|
|
movl %eax,et_nextremove(%edi)
|
|
|
|
Ldone:
|
|
movl Lstack,%esp // clear temporary variables from stack
|
|
|
|
popl %ebx // restore register variables
|
|
popl %edi
|
|
popl %esi
|
|
ret
|
|
|
|
// at least one point is clipped
|
|
|
|
Lp2:
|
|
testl %eax,%eax
|
|
jns Lp1
|
|
|
|
// else
|
|
// {
|
|
// // point 0 is clipped
|
|
|
|
// if (d1 < 0)
|
|
// {
|
|
movl Ld1,%eax
|
|
testl %eax,%eax
|
|
jns Lp3
|
|
|
|
// // both points are clipped
|
|
// // we do cache fully clipped edges
|
|
// if (!leftclipped)
|
|
movl C(r_leftclipped),%eax
|
|
movl C(r_pedge),%ecx
|
|
testl %eax,%eax
|
|
jnz Ldone
|
|
|
|
// r_pedge->framecount = r_framecount;
|
|
movl C(r_framecount),%eax
|
|
andl $(FRAMECOUNT_MASK),%eax
|
|
orl $(FULLY_CLIPPED_CACHED),%eax
|
|
movl %eax,C(cacheoffset)
|
|
|
|
// return;
|
|
jmp Ldone
|
|
|
|
// }
|
|
|
|
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
|
|
|