📄 r_polyse.c
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__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
void 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];
xstepdenominv = 1.0 / (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 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
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
}
#endif
/*
================
R_PolysetDrawThreshSpans8
Random fizzle fade rasterizer
================
*/
void R_PolysetDrawThreshSpans8 (spanpackage_t *pspanpackage)
{
int lcount;
byte *lpdest;
byte *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)
{
rand1k_index = (rand1k_index + 1) & MASK_1K;
if (rand1k[rand1k_index] <= r_affinetridesc.vis_thresh)
{
*lpdest = ((byte *)vid.colormap)[*lptex + (llight & 0xFF00)];
*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);
}
/*
================
R_PolysetDrawSpans8
================
*/
void R_PolysetDrawSpans8_33( spanpackage_t *pspanpackage)
{
int lcount;
byte *lpdest;
byte *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 = 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;
byte *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 = 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;
byte *lpdest;
byte *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 = 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;
byte *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 = vid.alphamap[r_aliasblendcolor*256 + *lpdest];
}
lpdest++;
lzi += r_zistepx;
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