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xash3d-fwgs/ref_soft/r_polyse.c
Gleb Mazovetskiy 5e0a0765ce Trim all trailing whitespace 
The `.editorconfig` file in this repo is configured to trim all trailing
whitespace regardless of whether the line is modified.

Trims all trailing whitespace in the repository to make the codebase easier
to work with in editors that respect `.editorconfig`.

`git blame` becomes less useful on these lines but it already isn't very useful.

Commands:

```
find . -type f -name '*.h' -exec sed --in-place 's/[[:space:]]\+$//' {} \+
find . -type f -name '*.c' -exec sed --in-place 's/[[:space:]]\+$//' {} \+
```
2021-01-04 20:55:10 +03:00

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/*
Copyright (C) 1997-2001 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.
*/
// d_polyset.c: routines for drawing sets of polygons sharing the same
// texture (used for Alias models)
#include "r_local.h"
// TODO: put in span spilling to shrink list size
// !!! if this is changed, it must be changed in d_polysa.s too !!!
#define DPS_MAXSPANS MAXHEIGHT+1
// 1 extra for spanpackage that marks end
// !!! if this is changed, it must be changed in asm_draw.h too !!!
typedef struct {
void *pdest;
short *pz;
int count;
pixel_t *ptex;
int sfrac, tfrac, light, zi;
} spanpackage_t;
typedef struct {
int isflattop;
int numleftedges;
int *pleftedgevert0;
int *pleftedgevert1;
int *pleftedgevert2;
int numrightedges;
int *prightedgevert0;
int *prightedgevert1;
int *prightedgevert2;
} edgetable;
aliastriangleparms_t aliastriangleparms;
int r_p0[6], r_p1[6], r_p2[6];
int d_xdenom;
edgetable *pedgetable;
edgetable edgetables[12] = {
{0, 1, r_p0, r_p2, NULL, 2, r_p0, r_p1, r_p2 },
{0, 2, r_p1, r_p0, r_p2, 1, r_p1, r_p2, NULL},
{1, 1, r_p0, r_p2, NULL, 1, r_p1, r_p2, NULL},
{0, 1, r_p1, r_p0, NULL, 2, r_p1, r_p2, r_p0 },
{0, 2, r_p0, r_p2, r_p1, 1, r_p0, r_p1, NULL},
{0, 1, r_p2, r_p1, NULL, 1, r_p2, r_p0, NULL},
{0, 1, r_p2, r_p1, NULL, 2, r_p2, r_p0, r_p1 },
{0, 2, r_p2, r_p1, r_p0, 1, r_p2, r_p0, NULL},
{0, 1, r_p1, r_p0, NULL, 1, r_p1, r_p2, NULL},
{1, 1, r_p2, r_p1, NULL, 1, r_p0, r_p1, NULL},
{1, 1, r_p1, r_p0, NULL, 1, r_p2, r_p0, NULL},
{0, 1, r_p0, r_p2, NULL, 1, r_p0, r_p1, NULL},
};
// FIXME: some of these can become statics
int a_sstepxfrac, a_tstepxfrac, r_lstepx, a_ststepxwhole;
int r_sstepx, r_tstepx, r_lstepy, r_sstepy, r_tstepy;
int r_zistepx, r_zistepy;
int d_aspancount, d_countextrastep;
spanpackage_t *a_spans;
spanpackage_t *d_pedgespanpackage;
static int ystart;
pixel_t *d_pdest, *d_ptex;
short *d_pz;
int d_sfrac, d_tfrac, d_light, d_zi;
int d_ptexextrastep, d_sfracextrastep;
int d_tfracextrastep, d_lightextrastep, d_pdestextrastep;
int d_lightbasestep, d_pdestbasestep, d_ptexbasestep;
int d_sfracbasestep, d_tfracbasestep;
int d_ziextrastep, d_zibasestep;
int d_pzextrastep, d_pzbasestep;
static int ubasestep, errorterm, erroradjustup, erroradjustdown;
typedef struct {
int quotient;
int remainder;
} adivtab_t;
static adivtab_t adivtab[32*32] = {
#include "adivtab.h"
};
byte *skintable[MAX_LBM_HEIGHT];
int skinwidth;
byte *skinstart;
void (*d_pdrawspans)(spanpackage_t *pspanpackage);
void R_PolysetStub (spanpackage_t *pspanpackage)
{
}
void R_PolysetDrawSpans8_33 (spanpackage_t *pspanpackage);
void R_PolysetDrawSpans8_66 (spanpackage_t *pspanpackage);
void R_PolysetDrawSpans8_Opaque (spanpackage_t *pspanpackage);
qboolean R_PolysetCalcGradients(int skinwidth);
void R_DrawNonSubdiv (void);
void R_PolysetSetEdgeTable (void);
void R_RasterizeAliasPolySmooth (void);
void R_PolysetScanLeftEdge(int height);
qboolean R_PolysetScanLeftEdge_C(int height);
/*
================
R_PolysetUpdateTables
================
*/
void R_PolysetUpdateTables (void)
{
int i;
byte *s;
if (r_affinetridesc.skinwidth != skinwidth ||
r_affinetridesc.pskin != skinstart)
{
skinwidth = r_affinetridesc.skinwidth;
skinstart = r_affinetridesc.pskin;
s = skinstart;
for (i=0 ; i<MAX_LBM_HEIGHT ; i++, s+=skinwidth)
skintable[i] = s;
}
}
/*
================
R_DrawTriangle
================
*/
void R_DrawTriangle( void )
{
spanpackage_t spans[DPS_MAXSPANS];
int dv1_ab, dv0_ac;
int dv0_ab, dv1_ac;
/*
d_xdenom = ( aliastriangleparms.a->v[1] - aliastriangleparms.b->v[1] ) * ( aliastriangleparms.a->v[0] - aliastriangleparms.c->v[0] ) -
( aliastriangleparms.a->v[0] - aliastriangleparms.b->v[0] ) * ( aliastriangleparms.a->v[1] - aliastriangleparms.c->v[1] );
*/
dv0_ab = aliastriangleparms.a->u - aliastriangleparms.b->u;
dv1_ab = aliastriangleparms.a->v - aliastriangleparms.b->v;
if ( !( dv0_ab | dv1_ab ) )
return;
dv0_ac = aliastriangleparms.a->u - aliastriangleparms.c->u;
dv1_ac = aliastriangleparms.a->v - aliastriangleparms.c->v;
if ( !( dv0_ac | dv1_ac ) )
return;
d_xdenom = ( dv0_ac * dv1_ab ) - ( dv0_ab * dv1_ac );
if ( d_xdenom < 0 )
{
a_spans = spans;
r_p0[0] = aliastriangleparms.a->u; // u
r_p0[1] = aliastriangleparms.a->v; // v
r_p0[2] = aliastriangleparms.a->s; // s
r_p0[3] = aliastriangleparms.a->t; // t
r_p0[4] = aliastriangleparms.a->l; // light
r_p0[5] = aliastriangleparms.a->zi; // iz
r_p1[0] = aliastriangleparms.b->u;
r_p1[1] = aliastriangleparms.b->v;
r_p1[2] = aliastriangleparms.b->s;
r_p1[3] = aliastriangleparms.b->t;
r_p1[4] = aliastriangleparms.b->l;
r_p1[5] = aliastriangleparms.b->zi;
r_p2[0] = aliastriangleparms.c->u;
r_p2[1] = aliastriangleparms.c->v;
r_p2[2] = aliastriangleparms.c->s;
r_p2[3] = aliastriangleparms.c->t;
r_p2[4] = aliastriangleparms.c->l;
r_p2[5] = aliastriangleparms.c->zi;
R_PolysetSetEdgeTable ();
R_RasterizeAliasPolySmooth ();
}
}
static pixel_t *skinend;
static inline qboolean R_DrawCheckBounds( pixel_t *lptex )
{
pixel_t *skin = r_affinetridesc.pskin;
if( lptex - skin < 0 || lptex - skinend >= 0 )
return false;
return true;
}
#if 0
static inline qboolean R_CheckBounds2( spanpackage_t *pspanpackage, int lcount )
{
int lsfrac, ltfrac;
pixel_t *lptex, *start, *end;
lptex = pspanpackage->ptex;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
start = r_affinetridesc.pskin;
end = skinend;
do
{
if( lptex - start < 0 || lptex - end >= 0 )
return false;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
// span is linear, so only need to check first and last
if( lptex - start < 0 || lptex - end >= 0 )
return false;
//if( !(--lcount) )
//return true;
lptex = lptex + a_ststepxwhole * lcount + ((lsfrac + ( a_sstepxfrac * lcount)) >> 16) + ((ltfrac + (a_tstepxfrac * lcount)) >> 16) * r_affinetridesc.skinwidth;
if( lptex - start < 0 || lptex - end >= 0 )
return false;
return true;
}
#endif
static inline qboolean R_PolysetCheckBounds( pixel_t *lptex, int lsfrac, int ltfrac, int lcount )
{
pixel_t *start, *end;
start = r_affinetridesc.pskin;
end = skinend;
// span is linear, so only need to check first and last
if( lptex - start < 0 || lptex - end >= 0 )
return false;
if( !(--lcount) )
return true;
lptex = lptex + a_ststepxwhole * lcount + ((lsfrac + ( a_sstepxfrac * lcount)) >> 16) + ((ltfrac + (a_tstepxfrac * lcount)) >> 16) * r_affinetridesc.skinwidth;
if( lptex - start < 0 || lptex - end >= 0 )
return false;
return true;
}
/*
===================
R_PolysetScanLeftEdge_C
====================
*/
qboolean R_PolysetScanLeftEdge_C(int height)
{
do
{
d_pedgespanpackage->pdest = d_pdest;
d_pedgespanpackage->pz = d_pz;
d_pedgespanpackage->count = d_aspancount;
d_pedgespanpackage->ptex = d_ptex;
d_pedgespanpackage->sfrac = d_sfrac;
d_pedgespanpackage->tfrac = d_tfrac;
// FIXME: need to clamp l, s, t, at both ends?
d_pedgespanpackage->light = d_light;
d_pedgespanpackage->zi = d_zi;
d_pedgespanpackage++;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_pdest += d_pdestextrastep;
d_pz += d_pzextrastep;
d_aspancount += d_countextrastep;
d_ptex += d_ptexextrastep;
d_sfrac += d_sfracextrastep;
d_ptex += d_sfrac >> 16;
d_sfrac &= 0xFFFF;
d_tfrac += d_tfracextrastep;
if (d_tfrac & 0x10000)
{
d_ptex += r_affinetridesc.skinwidth;
d_tfrac &= 0xFFFF;
}
d_light += d_lightextrastep;
d_zi += d_ziextrastep;
errorterm -= erroradjustdown;
}
else
{
d_pdest += d_pdestbasestep;
d_pz += d_pzbasestep;
d_aspancount += ubasestep;
d_ptex += d_ptexbasestep;
d_sfrac += d_sfracbasestep;
d_ptex += d_sfrac >> 16;
d_sfrac &= 0xFFFF;
d_tfrac += d_tfracbasestep;
if (d_tfrac & 0x10000)
{
d_ptex += r_affinetridesc.skinwidth;
d_tfrac &= 0xFFFF;
}
d_light += d_lightbasestep;
d_zi += d_zibasestep;
}
} while (--height);
return true;
}
/*
===================
FloorDivMod
Returns mathematically correct (floor-based) quotient and remainder for
numer and denom, both of which should contain no fractional part. The
quotient must fit in 32 bits.
FIXME: GET RID OF THIS! (FloorDivMod)
====================
*/
void FloorDivMod (float numer, float denom, int *quotient,
int *rem)
{
int q, r;
float x;
if (numer >= 0.0f)
{
x = floor(numer / denom);
q = (int)x;
r = (int)floor(numer - (x * denom));
}
else
{
//
// perform operations with positive values, and fix mod to make floor-based
//
x = floor(-numer / denom);
q = -(int)x;
r = (int)floor(-numer - (x * denom));
if (r != 0)
{
q--;
r = (int)denom - r;
}
}
if( q > INT_MAX / 2 || q < INT_MIN / 2 )
{
int i;
d_pdrawspans = R_PolysetStub;
gEngfuncs.Con_Printf( S_ERROR "FloorDivMod: q overflow!\n" );
q = 1;
}
if( r > INT_MAX / 2 || r < INT_MIN / 2 )
{
int i;
d_pdrawspans = R_PolysetStub;
gEngfuncs.Con_Printf( S_ERROR "FloorDivMod: r overflow!\n");
r = 1;
}
*quotient = q;
*rem = r;
}
/*
===================
R_PolysetSetUpForLineScan
====================
*/
void R_PolysetSetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,
fixed8_t endvertu, fixed8_t endvertv)
{
float dm, dn;
int tm, tn;
adivtab_t *ptemp;
// TODO: implement x86 version
errorterm = -1;
tm = endvertu - startvertu;
tn = endvertv - startvertv;
if (((tm <= 16) && (tm >= -15)) &&
((tn <= 16) && (tn >= -15)))
{
ptemp = &adivtab[((tm+15) << 5) + (tn+15)];
ubasestep = ptemp->quotient;
erroradjustup = ptemp->remainder;
erroradjustdown = tn;
}
else
{
dm = tm;
dn = tn;
FloorDivMod (dm, dn, &ubasestep, &erroradjustup);
erroradjustdown = dn;
}
}
/*
================
R_PolysetCalcGradients
================
*/
#if id386 && !defined __linux__
void R_PolysetCalcGradients( int skinwidth )
{
static float xstepdenominv, ystepdenominv, t0, t1;
static float p01_minus_p21, p11_minus_p21, p00_minus_p20, p10_minus_p20;
static float one = 1.0F, negative_one = -1.0F;
static unsigned long t0_int, t1_int;
extern unsigned long fpu_sp24_ceil_cw, fpu_ceil_cw, fpu_chop_cw;
/*
p00_minus_p20 = r_p0[0] - r_p2[0];
p01_minus_p21 = r_p0[1] - r_p2[1];
p10_minus_p20 = r_p1[0] - r_p2[0];
p11_minus_p21 = r_p1[1] - r_p2[1];
*/
__asm mov eax, dword ptr [r_p0+0]
__asm mov ebx, dword ptr [r_p0+4]
__asm sub eax, dword ptr [r_p2+0]
__asm sub ebx, dword ptr [r_p2+4]
__asm mov p00_minus_p20, eax
__asm mov p01_minus_p21, ebx
__asm fild dword ptr p00_minus_p20
__asm fild dword ptr p01_minus_p21
__asm mov eax, dword ptr [r_p1+0]
__asm mov ebx, dword ptr [r_p1+4]
__asm sub eax, dword ptr [r_p2+0]
__asm sub ebx, dword ptr [r_p2+4]
__asm fstp p01_minus_p21
__asm fstp p00_minus_p20
__asm mov p10_minus_p20, eax
__asm mov p11_minus_p21, ebx
__asm fild dword ptr p10_minus_p20
__asm fild dword ptr p11_minus_p21
__asm fstp p11_minus_p21
__asm fstp p10_minus_p20
/*
xstepdenominv = 1.0 / (float)d_xdenom;
ystepdenominv = -xstepdenominv;
*/
/*
** put FPU in single precision ceil mode
*/
__asm fldcw word ptr [fpu_sp24_ceil_cw]
// __asm fldcw word ptr [fpu_ceil_cw]
__asm fild dword ptr d_xdenom ; d_xdenom
__asm fdivr one ; 1 / d_xdenom
__asm fst xstepdenominv ;
__asm fmul negative_one ; -( 1 / d_xdenom )
// ceil () for light so positive steps are exaggerated, negative steps
// diminished, pushing us away from underflow toward overflow. Underflow is
// very visible, overflow is very unlikely, because of ambient lighting
/*
t0 = r_p0[4] - r_p2[4];
t1 = r_p1[4] - r_p2[4];
r_lstepx = (int)
ceil((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
r_lstepy = (int)
ceil((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
*/
__asm mov eax, dword ptr [r_p0+16]
__asm mov ebx, dword ptr [r_p1+16]
__asm sub eax, dword ptr [r_p2+16]
__asm sub ebx, dword ptr [r_p2+16]
__asm fstp ystepdenominv ; (empty)
__asm mov t0_int, eax
__asm mov t1_int, ebx
__asm fild t0_int ; t0
__asm fild t1_int ; t1 | t0
__asm fxch st(1) ; t0 | t1
__asm fstp t0 ; t1
__asm fst t1 ; t1
__asm fmul p01_minus_p21 ; t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p01_minus_p21
__asm fmul p11_minus_p21 ; t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t1 ; t1 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p00_minus_p20 ; t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p10_minus_p20 ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fxch st(2) ; t0 * p11_minus_p21 | t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21
__asm fsubp st(3), st ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fsubrp st(1), st ; t1 * p00_minus_p20 - t0 * p10_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fxch st(1) ; t1 * p01_minus_p21 - t0 * p11_minus_p21 | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fmul xstepdenominv ; r_lstepx | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fxch st(1)
__asm fmul ystepdenominv ; r_lstepy | r_lstepx
__asm fxch st(1) ; r_lstepx | r_lstepy
__asm fistp dword ptr [r_lstepx]
__asm fistp dword ptr [r_lstepy]
/*
** put FPU back into extended precision chop mode
*/
__asm fldcw word ptr [fpu_chop_cw]
/*
t0 = r_p0[2] - r_p2[2];
t1 = r_p1[2] - r_p2[2];
r_sstepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_sstepy = (int)((t1 * p00_minus_p20 - t0* p10_minus_p20) *
ystepdenominv);
*/
__asm mov eax, dword ptr [r_p0+8]
__asm mov ebx, dword ptr [r_p1+8]
__asm sub eax, dword ptr [r_p2+8]
__asm sub ebx, dword ptr [r_p2+8]
__asm mov t0_int, eax
__asm mov t1_int, ebx
__asm fild t0_int ; t0
__asm fild t1_int ; t1 | t0
__asm fxch st(1) ; t0 | t1
__asm fstp t0 ; t1
__asm fst t1 ; (empty)
__asm fmul p01_minus_p21 ; t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p01_minus_p21
__asm fmul p11_minus_p21 ; t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t1 ; t1 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p00_minus_p20 ; t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p10_minus_p20 ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fxch st(2) ; t0 * p11_minus_p21 | t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21
__asm fsubp st(3), st ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fsubrp st(1), st ; t1 * p00_minus_p20 - t0 * p10_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fxch st(1) ; t1 * p01_minus_p21 - t0 * p11_minus_p21 | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fmul xstepdenominv ; r_lstepx | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fxch st(1)
__asm fmul ystepdenominv ; r_lstepy | r_lstepx
__asm fxch st(1) ; r_lstepx | r_lstepy
__asm fistp dword ptr [r_sstepx]
__asm fistp dword ptr [r_sstepy]
/*
t0 = r_p0[3] - r_p2[3];
t1 = r_p1[3] - r_p2[3];
r_tstepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_tstepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
*/
__asm mov eax, dword ptr [r_p0+12]
__asm mov ebx, dword ptr [r_p1+12]
__asm sub eax, dword ptr [r_p2+12]
__asm sub ebx, dword ptr [r_p2+12]
__asm mov t0_int, eax
__asm mov t1_int, ebx
__asm fild t0_int ; t0
__asm fild t1_int ; t1 | t0
__asm fxch st(1) ; t0 | t1
__asm fstp t0 ; t1
__asm fst t1 ; (empty)
__asm fmul p01_minus_p21 ; t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p01_minus_p21
__asm fmul p11_minus_p21 ; t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t1 ; t1 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p00_minus_p20 ; t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p10_minus_p20 ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fxch st(2) ; t0 * p11_minus_p21 | t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21
__asm fsubp st(3), st ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fsubrp st(1), st ; t1 * p00_minus_p20 - t0 * p10_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fxch st(1) ; t1 * p01_minus_p21 - t0 * p11_minus_p21 | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fmul xstepdenominv ; r_lstepx | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fxch st(1)
__asm fmul ystepdenominv ; r_lstepy | r_lstepx
__asm fxch st(1) ; r_lstepx | r_lstepy
__asm fistp dword ptr [r_tstepx]
__asm fistp dword ptr [r_tstepy]
/*
t0 = r_p0[5] - r_p2[5];
t1 = r_p1[5] - r_p2[5];
r_zistepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_zistepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
*/
__asm mov eax, dword ptr [r_p0+20]
__asm mov ebx, dword ptr [r_p1+20]
__asm sub eax, dword ptr [r_p2+20]
__asm sub ebx, dword ptr [r_p2+20]
__asm mov t0_int, eax
__asm mov t1_int, ebx
__asm fild t0_int ; t0
__asm fild t1_int ; t1 | t0
__asm fxch st(1) ; t0 | t1
__asm fstp t0 ; t1
__asm fst t1 ; (empty)
__asm fmul p01_minus_p21 ; t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p01_minus_p21
__asm fmul p11_minus_p21 ; t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t1 ; t1 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p00_minus_p20 ; t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fld t0 ; t0 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fmul p10_minus_p20 ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t0 * p11_minus_p21 | t1 * p01_minus_p21
__asm fxch st(2) ; t0 * p11_minus_p21 | t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21
__asm fsubp st(3), st ; t0 * p10_minus_p20 | t1 * p00_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fsubrp st(1), st ; t1 * p00_minus_p20 - t0 * p10_minus_p20 | t1 * p01_minus_p21 - t0 * p11_minus_p21
__asm fxch st(1) ; t1 * p01_minus_p21 - t0 * p11_minus_p21 | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fmul xstepdenominv ; r_lstepx | t1 * p00_minus_p20 - t0 * p10_minus_p20
__asm fxch st(1)
__asm fmul ystepdenominv ; r_lstepy | r_lstepx
__asm fxch st(1) ; r_lstepx | r_lstepy
__asm fistp dword ptr [r_zistepx]
__asm fistp dword ptr [r_zistepy]
/*
#if id386ALIAS
a_sstepxfrac = r_sstepx << 16;
a_tstepxfrac = r_tstepx << 16;
#else
a_sstepxfrac = r_sstepx & 0xFFFF;
a_tstepxfrac = r_tstepx & 0xFFFF;
#endif
*/
__asm mov eax, d_pdrawspans
__asm cmp eax, offset R_PolysetDrawSpans8_Opaque
__asm mov eax, r_sstepx
__asm mov ebx, r_tstepx
__asm jne translucent
//#if id386ALIAS
__asm shl eax, 16
__asm shl ebx, 16
__asm jmp done_with_steps
//#else
translucent:
__asm and eax, 0ffffh
__asm and ebx, 0ffffh
//#endif
done_with_steps:
__asm mov a_sstepxfrac, eax
__asm mov a_tstepxfrac, ebx
/*
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
*/
__asm mov ebx, r_tstepx
__asm mov ecx, r_sstepx
__asm sar ebx, 16
__asm mov eax, skinwidth
__asm mul ebx
__asm sar ecx, 16
__asm add eax, ecx
__asm mov a_ststepxwhole, eax
}
#else
qboolean R_PolysetCalcGradients (int skinwidth)
{
float xstepdenominv, ystepdenominv, t0, t1;
float p01_minus_p21, p11_minus_p21, p00_minus_p20, p10_minus_p20;
p00_minus_p20 = r_p0[0] - r_p2[0];
p01_minus_p21 = r_p0[1] - r_p2[1];
p10_minus_p20 = r_p1[0] - r_p2[0];
p11_minus_p21 = r_p1[1] - r_p2[1];
/*printf("gradients for triangle\n");
printf("%d %d %d %d %d %d\n" , r_p0[0], r_p0[1], r_p0[2] >> 16, r_p0[3] >> 16, r_p0[4], r_p0[5]);
printf("%d %d %d %d %d %d\n" , r_p1[0], r_p1[1], r_p1[2] >> 16, r_p1[3] >> 16, r_p1[4], r_p1[5]);
printf("%d %d %d %d %d %d\n\n", r_p2[0], r_p2[1], r_p2[2] >> 16, r_p2[3] >> 16, r_p2[4], r_p2[5]);
*/
xstepdenominv = 1.0f / (float)d_xdenom;
ystepdenominv = -xstepdenominv;
// ceil () for light so positive steps are exaggerated, negative steps
// diminished, pushing us away from underflow toward overflow. Underflow is
// very visible, overflow is very unlikely, because of ambient lighting
t0 = r_p0[4] - r_p2[4];
t1 = r_p1[4] - r_p2[4];
r_lstepx = (int)
ceil((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
r_lstepy = (int)
ceil((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
t0 = r_p0[2] - r_p2[2];
t1 = r_p1[2] - r_p2[2];
r_sstepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_sstepy = (int)((t1 * p00_minus_p20 - t0* p10_minus_p20) *
ystepdenominv);
t0 = r_p0[3] - r_p2[3];
t1 = r_p1[3] - r_p2[3];
r_tstepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_tstepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
t0 = r_p0[5] - r_p2[5];
t1 = r_p1[5] - r_p2[5];
r_zistepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_zistepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
/*if( r_zistepx > INT_MAX / 2 )
return false;
if( r_zistepx < INT_MIN / 2 )
return false;
if( r_zistepy > INT_MAX / 2 )
return false;
if( r_zistepy < INT_MIN / 2 )
return false;*/
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
a_sstepxfrac = r_sstepx << 16;
a_tstepxfrac = r_tstepx << 16;
}
else
#endif
{
//#else
a_sstepxfrac = r_sstepx & 0xFFFF;
a_tstepxfrac = r_tstepx & 0xFFFF;
}
//#endif
// do not allow big steps to make 512 byte extra bounds enough (still f**ng not)
/*if( r_sstepx <= -65535*8 )
return false;
if( r_tstepx <= -65535*8)
return false;
if( r_sstepx >= 65535*8 )
return false;
if( r_tstepx >= 65535*8 )
return false;*/
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
// printf("%d %d %d %d\n",a_ststepxwhole, r_sstepx, r_tstepx, skinwidth );
skinend = (pixel_t*)r_affinetridesc.pskin + r_affinetridesc.skinwidth * r_affinetridesc.skinheight;
return true;
}
#endif
/*
================
R_PolysetDrawSpans8
================
*/
void R_PolysetDrawSpansBlended( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
pixel_t *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
pspanpackage++;
#if BOUNDCHECK_MODE == 0
if( !R_PolysetCheckBounds( lptex, lsfrac, ltfrac, lcount ) )
continue;
#endif
do
{
if ((lzi >> 16) >= *lpz)
{
#if 0
if((int)(lptex - (pixel_t*)r_affinetridesc.pskin) > r_affinetridesc.skinwidth * r_affinetridesc.skinheight || (int)(lptex - (pixel_t*)r_affinetridesc.pskin) < 0 )
{
printf("%d %d %d %d\n",(int)(lptex - (pixel_t*)r_affinetridesc.pskin), r_affinetridesc.skinwidth * r_affinetridesc.skinheight, lsfrac, a_ststepxwhole );
return;
}
#endif
#if BOUNDCHECK_MODE == 1
if( !R_DrawCheckBounds( lptex ) )
return;
#endif
pixel_t temp = *lptex;//vid.colormap[*lptex + ( llight & 0xFF00 )];
int alpha = vid.alpha;
temp = BLEND_COLOR(temp, vid.color);
if( alpha == 7 )
*lpdest = temp;
else if(alpha)
*lpdest = BLEND_ALPHA(alpha,temp,*lpdest);//vid.alphamap[temp+ *lpdest*256];
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
else pspanpackage++;
} while (pspanpackage->count != -999999);
}
/*
================
R_PolysetDrawSpans8
================
*/
void R_PolysetDrawSpansAdditive( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
pixel_t *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
pspanpackage++;
#if BOUNDCHECK_MODE == 0
if( !R_PolysetCheckBounds( lptex, lsfrac, ltfrac, lcount ) )
continue;
#endif
do
{
if ((lzi >> 16) >= *lpz)
{
#if BOUNDCHECK_MODE == 1
if( !R_DrawCheckBounds( lptex ) )
return;
#endif
#if 0
if((int)(lptex - (pixel_t*)r_affinetridesc.pskin) > r_affinetridesc.skinwidth * r_affinetridesc.skinheight || (int)(lptex - (pixel_t*)r_affinetridesc.pskin) < 0 )
{
printf("%d %d %d %d\n",(int)(lptex - (pixel_t*)r_affinetridesc.pskin), r_affinetridesc.skinwidth * r_affinetridesc.skinheight, lsfrac, a_ststepxwhole );
return;
}
#endif
pixel_t temp = *lptex;//vid.colormap[*lptex + ( llight & 0xFF00 )];
temp = BLEND_COLOR(temp, vid.color);
*lpdest = BLEND_ADD(temp,*lpdest);
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
else pspanpackage++;
} while (pspanpackage->count != -999999);
}
/*
================
R_PolysetDrawSpans8
================
*/
void R_PolysetDrawSpansGlow( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
pixel_t *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
pspanpackage++;
#if BOUNDCHECK_MODE == 0
if( !R_PolysetCheckBounds( lptex, lsfrac, ltfrac, lcount ) )
continue;
#endif
do
{
//if ((lzi >> 16) >= *lpz)
{
#if BOUNDCHECK_MODE == 1
if( !R_DrawCheckBounds( lptex ) )
return;
#endif
#if 0
if((int)(lptex - (pixel_t*)r_affinetridesc.pskin) > r_affinetridesc.skinwidth * r_affinetridesc.skinheight || (int)(lptex - (pixel_t*)r_affinetridesc.pskin) < 0 )
{
printf("%d %d %d %d\n",(int)(lptex - (pixel_t*)r_affinetridesc.pskin), r_affinetridesc.skinwidth * r_affinetridesc.skinheight, lsfrac, a_ststepxwhole );
return;
}
#endif
pixel_t temp = *lptex;//vid.colormap[*lptex + ( llight & 0xFF00 )];
temp = BLEND_COLOR(temp, vid.color);
*lpdest = BLEND_ADD(temp,*lpdest);
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
else
pspanpackage++;
} while (pspanpackage->count != -999999);
}
/*
================
R_PolysetDrawSpans8
================
*/
void R_PolysetDrawSpansTextureBlended( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
pixel_t *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
pspanpackage++;
#if BOUNDCHECK_MODE == 0
if( !R_PolysetCheckBounds( lptex, lsfrac, ltfrac, lcount ) )
continue;
#endif
do
{
if ((lzi >> 16) >= *lpz)
{
#if BOUNDCHECK_MODE == 1
if( !R_DrawCheckBounds( lptex ) )
return;
#endif
#if 0
if((int)(lptex - (pixel_t*)r_affinetridesc.pskin) > r_affinetridesc.skinwidth * r_affinetridesc.skinheight || (int)(lptex - (pixel_t*)r_affinetridesc.pskin) < 0 )
{
printf("%d %d %d %d\n",(int)(lptex - (pixel_t*)r_affinetridesc.pskin), r_affinetridesc.skinwidth * r_affinetridesc.skinheight, lsfrac, a_ststepxwhole );
return;
}
#endif
pixel_t temp = *lptex;//vid.colormap[*lptex + ( llight & 0xFF00 )];
int alpha = temp >> 13;
temp = temp << 3;
temp = BLEND_COLOR(temp, vid.color);
if( alpha == 7 )
*lpdest = temp;
else if(alpha)
*lpdest = BLEND_ALPHA(alpha,temp,*lpdest);//vid.alphamap[temp+ *lpdest*256];
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
else
pspanpackage++;
} while (pspanpackage->count != -999999);
}
/*
================
R_PolysetDrawSpans8
================
*/
void R_PolysetDrawSpans8_33( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
pixel_t *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
#if 0
if((int)(lptex - (pixel_t*)r_affinetridesc.pskin) > r_affinetridesc.skinwidth * r_affinetridesc.skinheight || (int)(lptex - (pixel_t*)r_affinetridesc.pskin) < 0 )
{
printf("%d %d %d %d\n",(int)(lptex - (pixel_t*)r_affinetridesc.pskin), r_affinetridesc.skinwidth * r_affinetridesc.skinheight, lsfrac, a_ststepxwhole );
return;
}
#endif
pixel_t temp = *lptex;//vid.colormap[*lptex + ( llight & 0xFF00 )];
int alpha = tr.blend * 7;
if( alpha == 7 )
*lpdest = temp;
else if(alpha)
*lpdest = BLEND_ALPHA(alpha,temp,*lpdest);//vid.alphamap[temp+ *lpdest*256];
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
void R_PolysetDrawSpansConstant8_33( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lpz = pspanpackage->pz;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
*lpdest = BLEND_ALPHA(2,r_aliasblendcolor,*lpdest);//vid.alphamap[r_aliasblendcolor + *lpdest*256];
}
lpdest++;
lzi += r_zistepx;
lpz++;
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
void R_PolysetDrawSpans8_66(spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
pixel_t *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
int temp = vid.colormap[*lptex + ( llight & 0xFF00 )];
*lpdest = BLEND_ALPHA(5,temp,*lpdest);//vid.alphamap[temp*256 + *lpdest];
*lpz = lzi >> 16;
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
void R_PolysetDrawSpansConstant8_66( spanpackage_t *pspanpackage)
{
int lcount;
pixel_t *lpdest;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
lpdest = pspanpackage->pdest;
lpz = pspanpackage->pz;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
*lpdest = BLEND_ALPHA(5,r_aliasblendcolor,*lpdest);//vid.alphamap[r_aliasblendcolor*256 + *lpdest];
}
lpdest++;
lzi += r_zistepx;
lpz++;
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
#if !id386
void R_PolysetDrawSpans8_Opaque (spanpackage_t *pspanpackage)
{
int lcount;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
int lsfrac, ltfrac;
pixel_t *lpdest;
pixel_t *lptex;
int llight;
int lzi;
short *lpz;
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
//PGM
/*if(r_newrefdef.rdflags & RDF_IRGOGGLES && RI.currententity->flags & RF_IR_VISIBLE)
*lpdest = ((byte *)vid.colormap)[irtable[*lptex]];
else*/
*lpdest = ((byte *)vid.colormap)[*lptex + (llight & 0xFF00)];
//PGM
*lpz = lzi >> 16;
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
#endif
#if 0
/*
================
R_PolysetFillSpans8
================
*/
void R_PolysetFillSpans8 (spanpackage_t *pspanpackage)
{
int color;
// FIXME: do z buffering
color = d_aflatcolor++;
while (1)
{
int lcount;
byte *lpdest;
lcount = pspanpackage->count;
if (lcount == -1)
return;
if (lcount)
{
lpdest = pspanpackage->pdest;
do
{
*lpdest++ = color;
} while (--lcount);
}
pspanpackage++;
}
}
#else
void R_PolysetFillSpans8 (spanpackage_t *pspanpackage)
{
//int color;
int lcount;
// FIXME: do z buffering
//color = d_aflatcolor++ * 10;
do
{
lcount = d_aspancount - pspanpackage->count;
// d_ptex + a_ststepxwhole * lcount + ((a_sstepxfrac * lcount) >> 16) + ((a_tstepxfrac * lcount) >> 16)*r_affinetridesc.skinwidth;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
{
d_aspancount += ubasestep;
}
if (lcount)
{
int lsfrac, ltfrac;
pixel_t *lpdest;
pixel_t *lptex;
int llight;
int lzi;
short *lpz;
lpdest = pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
pspanpackage ++;
#if BOUNDCHECK_MODE == 0
if( !R_PolysetCheckBounds( lptex, lsfrac, ltfrac, lcount ) )
continue;
#endif
do
{
if ((lzi >> 16) >= *lpz)
{
#if BOUNDCHECK_MODE == 1
if( !R_DrawCheckBounds( lptex ) )
return;
#endif
//PGM
/*if(r_newrefdef.rdflags & RDF_IRGOGGLES && RI.currententity->flags & RF_IR_VISIBLE)
*lpdest = ((byte *)vid.colormap)[irtable[*lptex]];
else*/
//*lpdest = *lptex; //((byte *)vid.colormap)[*lptex + (llight & 0xFF00)];
#if 0 // check for texture bounds to make asan happy
if((int)(lptex - (pixel_t*)r_affinetridesc.pskin) > r_affinetridesc.skinwidth * r_affinetridesc.skinheight || (int)(lptex - (pixel_t*)r_affinetridesc.pskin) < 0 )
{
printf("%d %d %d %d\n",(int)(lptex - (pixel_t*)r_affinetridesc.pskin), r_affinetridesc.skinwidth * r_affinetridesc.skinheight, lsfrac, a_ststepxwhole );
return;
}
#endif
pixel_t src = *lptex;
//*lpdest = //vid.colormap[src & 0xff00|(llight>>8)] << 8 | (src & llight & 0xff) | ((src & 0xff) >> 3);
// very dirty, maybe need dual colormap?
//*lpdest = (vid.colormap[src >> 8 | (llight & 0xFF00)] << 8) | src & 0xff;
// 13 bit lighting, 32 light levels
*lpdest = vid.colormap[(src >> 3) | ((llight & 0x1F00) << 5)] | (src & 7);
//PGM
*lpz = lzi >> 16;
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
lptex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
lptex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
lptex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
else pspanpackage++;
} while (pspanpackage->count != -999999);
}
#endif
/*
================
R_RasterizeAliasPolySmooth
================
*/
void R_RasterizeAliasPolySmooth (void)
{
int initialleftheight, initialrightheight;
int *plefttop, *prighttop, *pleftbottom, *prightbottom;
int working_lstepx, originalcount;
plefttop = pedgetable->pleftedgevert0;
prighttop = pedgetable->prightedgevert0;
pleftbottom = pedgetable->pleftedgevert1;
prightbottom = pedgetable->prightedgevert1;
initialleftheight = pleftbottom[1] - plefttop[1];
initialrightheight = prightbottom[1] - prighttop[1];
//
// set the s, t, and light gradients, which are consistent across the triangle
// because being a triangle, things are affine
//
if( !R_PolysetCalcGradients (r_affinetridesc.skinwidth) )
return;
//
// rasterize the polygon
//
//
// scan out the top (and possibly only) part of the left edge
//
d_pedgespanpackage = a_spans;
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (pixel_t*)r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_sfrac = (plefttop[2] & 0xFFFF) << 16;
d_tfrac = (plefttop[3] & 0xFFFF) << 16;
}
//#else
else
#endif
{
d_sfrac = plefttop[2] & 0xFFFF;
d_tfrac = plefttop[3] & 0xFFFF;
}
//#endif
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdest = (pixel_t *)d_viewbuffer +
ystart * r_screenwidth + plefttop[0];
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
if (initialleftheight == 1)
{
d_pedgespanpackage->pdest = d_pdest;
d_pedgespanpackage->pz = d_pz;
d_pedgespanpackage->count = d_aspancount;
d_pedgespanpackage->ptex = d_ptex;
d_pedgespanpackage->sfrac = d_sfrac;
d_pedgespanpackage->tfrac = d_tfrac;
// FIXME: need to clamp l, s, t, at both ends?
d_pedgespanpackage->light = d_light;
d_pedgespanpackage->zi = d_zi;
d_pedgespanpackage++;
}
else
{
R_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_pzbasestep = (d_zwidth + ubasestep) << 1;
d_pzextrastep = d_pzbasestep + 2;
}
//#else
else
#endif
{
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
}
//#endif
d_pdestbasestep = r_screenwidth + ubasestep;
d_pdestextrastep = d_pdestbasestep + 1;
// TODO: can reuse partial expressions here
// for negative steps in x along left edge, bias toward overflow rather than
// underflow (sort of turning the floor () we did in the gradient calcs into
// ceil (), but plus a little bit)
if (ubasestep < 0)
working_lstepx = r_lstepx - 1;
else
working_lstepx = r_lstepx;
d_countextrastep = ubasestep + 1;
d_ptexbasestep = ((r_sstepy + r_sstepx * ubasestep) >> 16) +
((r_tstepy + r_tstepx * ubasestep) >> 16) *
r_affinetridesc.skinwidth;
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
}
else
#endif
{
//#else
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
}
//#endif
d_lightbasestep = r_lstepy + working_lstepx * ubasestep;
d_zibasestep = r_zistepy + r_zistepx * ubasestep;
d_ptexextrastep = ((r_sstepy + r_sstepx * d_countextrastep) >> 16) +
((r_tstepy + r_tstepx * d_countextrastep) >> 16) *
r_affinetridesc.skinwidth;
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_sfracextrastep = (r_sstepy + r_sstepx*d_countextrastep) << 16;
d_tfracextrastep = (r_tstepy + r_tstepx*d_countextrastep) << 16;
}
else
#endif
{
//#else
d_sfracextrastep = (r_sstepy + r_sstepx*d_countextrastep) & 0xFFFF;
d_tfracextrastep = (r_tstepy + r_tstepx*d_countextrastep) & 0xFFFF;
}
//#endif
d_lightextrastep = d_lightbasestep + working_lstepx;
d_ziextrastep = d_zibasestep + r_zistepx;
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
R_PolysetScanLeftEdge (initialleftheight);
}
else
#endif
{
if(!R_PolysetScanLeftEdge_C(initialleftheight))
return;
}
}
//
// scan out the bottom part of the left edge, if it exists
//
if (pedgetable->numleftedges == 2)
{
int height;
plefttop = pleftbottom;
pleftbottom = pedgetable->pleftedgevert2;
height = pleftbottom[1] - plefttop[1];
// TODO: make this a function; modularize this function in general
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (pixel_t*)r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
d_sfrac = 0;
d_tfrac = 0;
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdest = (pixel_t *)d_viewbuffer + ystart * r_screenwidth + plefttop[0];
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
if (height == 1)
{
d_pedgespanpackage->pdest = d_pdest;
d_pedgespanpackage->pz = d_pz;
d_pedgespanpackage->count = d_aspancount;
d_pedgespanpackage->ptex = d_ptex;
d_pedgespanpackage->sfrac = d_sfrac;
d_pedgespanpackage->tfrac = d_tfrac;
// FIXME: need to clamp l, s, t, at both ends?
d_pedgespanpackage->light = d_light;
d_pedgespanpackage->zi = d_zi;
d_pedgespanpackage++;
}
else
{
R_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
d_pdestbasestep = r_screenwidth + ubasestep;
d_pdestextrastep = d_pdestbasestep + 1;
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_pzbasestep = (d_zwidth + ubasestep) << 1;
d_pzextrastep = d_pzbasestep + 2;
}
//#else
else
#endif
{
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
}
//#endif
if (ubasestep < 0)
working_lstepx = r_lstepx - 1;
else
working_lstepx = r_lstepx;
d_countextrastep = ubasestep + 1;
d_ptexbasestep = ((r_sstepy + r_sstepx * ubasestep) >> 16) +
((r_tstepy + r_tstepx * ubasestep) >> 16) *
r_affinetridesc.skinwidth;
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
}
//#else
else
#endif
{
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
}
//#endif
d_lightbasestep = r_lstepy + working_lstepx * ubasestep;
d_zibasestep = r_zistepy + r_zistepx * ubasestep;
d_ptexextrastep = ((r_sstepy + r_sstepx * d_countextrastep) >> 16) +
((r_tstepy + r_tstepx * d_countextrastep) >> 16) *
r_affinetridesc.skinwidth;
//#if id386ALIAS
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
d_sfracextrastep = ((r_sstepy+r_sstepx*d_countextrastep) & 0xFFFF)<<16;
d_tfracextrastep = ((r_tstepy+r_tstepx*d_countextrastep) & 0xFFFF)<<16;
}
else
#endif
//#endif
{
d_sfracextrastep = (r_sstepy+r_sstepx*d_countextrastep) & 0xFFFF;
d_tfracextrastep = (r_tstepy+r_tstepx*d_countextrastep) & 0xFFFF;
}
//#endif
d_lightextrastep = d_lightbasestep + working_lstepx;
d_ziextrastep = d_zibasestep + r_zistepx;
#if id386
if ( d_pdrawspans == R_PolysetDrawSpans8_Opaque )
{
R_PolysetScanLeftEdge (height);
}
else
#endif
{
if(!R_PolysetScanLeftEdge_C(height))
return;
}
}
}
// scan out the top (and possibly only) part of the right edge, updating the
// count field
d_pedgespanpackage = a_spans;
R_PolysetSetUpForLineScan(prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_aspancount = 0;
d_countextrastep = ubasestep + 1;
originalcount = a_spans[initialrightheight].count;
a_spans[initialrightheight].count = -999999; // mark end of the spanpackages
(*d_pdrawspans) (a_spans);
// scan out the bottom part of the right edge, if it exists
if (pedgetable->numrightedges == 2)
{
int height;
spanpackage_t *pstart;
pstart = a_spans + initialrightheight;
pstart->count = originalcount;
d_aspancount = prightbottom[0] - prighttop[0];
prighttop = prightbottom;
prightbottom = pedgetable->prightedgevert2;
height = prightbottom[1] - prighttop[1];
R_PolysetSetUpForLineScan(prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_countextrastep = ubasestep + 1;
a_spans[initialrightheight + height].count = -999999;
// mark end of the spanpackages
(*d_pdrawspans) (pstart);
}
}
/*
================
R_PolysetSetEdgeTable
================
*/
void R_PolysetSetEdgeTable (void)
{
int edgetableindex;
edgetableindex = 0; // assume the vertices are already in
// top to bottom order
//
// determine which edges are right & left, and the order in which
// to rasterize them
//
if (r_p0[1] >= r_p1[1])
{
if (r_p0[1] == r_p1[1])
{
if (r_p0[1] < r_p2[1])
pedgetable = &edgetables[2];
else
pedgetable = &edgetables[5];
return;
}
else
{
edgetableindex = 1;
}
}
if (r_p0[1] == r_p2[1])
{
if (edgetableindex)
pedgetable = &edgetables[8];
else
pedgetable = &edgetables[9];
return;
}
else if (r_p1[1] == r_p2[1])
{
if (edgetableindex)
pedgetable = &edgetables[10];
else
pedgetable = &edgetables[11];
return;
}
if (r_p0[1] > r_p2[1])
edgetableindex += 2;
if (r_p1[1] > r_p2[1])
edgetableindex += 4;
pedgetable = &edgetables[edgetableindex];
}
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