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fteqw/engine/sw/d_polyse.c

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/*
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.
*/
// d_polyset.c: routines for drawing sets of polygons sharing the same
// texture (used for Alias models)
/*
There are three ways to draw a triangle, reflecting the three possible values of trivial accept.
accept 0 draws spanned triangles. The triangles are clipped to the screen before the spans are generated. Hrm.
accept 1 draws triangle spans. There's no clipping to the screen except the 8 bounding box points.
accept 3 compleatly on screen. Triangles are not spanned but recursivly subdivided to fill.
0 is used on meshes that arn't fully on screen
1 is used for near meshes
3 is used for more distant meshes.
Note that the C routines cover all methods as does the asm. However, the asm doesn't support any blending or any depth other than 8bit.
C functions ending C are for C drawing only and shouldn't branch into the asm. Functions ending ASM will never be used in the pure C code.
Texture coords are 16.16, not 0-1. Alternate skins thus need prescaling, but can be over-sized without too many changes.
*/
//changes include stvertexes now being seperatly number from the triangles.
//this allows q2 models to be supported.
#include "quakedef.h"
#include "r_local.h"
#include "d_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;
qbyte *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;
int r_p0[6], r_p1[6], r_p2[6];
qbyte *d_pcolormap;
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;
qbyte *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;
typedef struct {
int quotient;
int remainder;
} adivtab_t;
static adivtab_t adivtab[32*32] = {
#include "adivtab.h"
};
qbyte *skintable[MAX_LBM_HEIGHT];
int skinwidth;
qbyte *skinstart;
qbyte transfactor;
qbyte transbackfac;
#if id386
#define D_PolysetScanLeftEdge D_PolysetScanLeftEdge
#define D_PolysetScanLeftEdge32 D_PolysetScanLeftEdgeC
void D_PolysetScanLeftEdge (int height);
#else
#define D_PolysetScanLeftEdge D_PolysetScanLeftEdgeC
#define D_PolysetScanLeftEdge32 D_PolysetScanLeftEdgeC
#define D_PolysetSetUpForLineScan D_PolysetSetUpForLineScanC
#define D_PolysetSetUpForLineScan32 D_PolysetSetUpForLineScanC
#endif
void D_PolysetDrawSpans8 (spanpackage_t *pspanpackage);
void D_PolysetDrawSpans8C (spanpackage_t *pspanpackage);
void D_PolysetCalcGradientsC (int skinwidth);
void D_PolysetCalcGradientsAsm (int skinwidth);
void D_DrawSubdiv (void);
void D_DrawSubdivC (void);
void D_DrawNonSubdiv (void);
void D_DrawNonSubdivC (void);
void D_DrawNonSubdiv32C (void);
void D_PolysetRecursiveTriangleC (int *p1, int *p2, int *p3);
void D_PolysetSetEdgeTable (void);
void D_RasterizeAliasPolySmooth8Asm (void);
void D_RasterizeAliasPolySmooth8C (void);
void D_PolysetScanLeftEdgeC (int height);
void D_PolysetRecursiveTriangle16C (int *lp1, int *lp2, int *lp3);
void D_PolysetSetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,
fixed8_t endvertu, fixed8_t endvertv);
void D_PolysetDrawFinalVertsTrans (finalvert_t *fv, int numverts)
{
int i, z;
short *zbuf;
for (i=0 ; i<numverts ; i++, fv++)
{
// valid triangle coordinates for filling can include the bottom and
// right clip edges, due to the fill rule; these shouldn't be drawn
if ((fv->v[0] < r_refdef.vrectright) &&
(fv->v[1] < r_refdef.vrectbottom))
{
z = fv->v[5]>>16;
zbuf = zspantable[fv->v[1]] + fv->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = skintable[fv->v[3]>>16][fv->v[2]>>16];
pix = ((qbyte *)acolormap)[apalremap[pix] + (fv->v[4] & 0xFF00) ];
d_viewbuffer[d_scantable[fv->v[1]] + fv->v[0]] = Trans(d_viewbuffer[d_scantable[fv->v[1]] + fv->v[0]], (unsigned char)pix);
}
}
}
}
void D_PolysetDrawFinalVerts32Trans (finalvert_t *fv, int numverts)
{
int i, z;
short *zbuf;
for (i=0 ; i<numverts ; i++, fv++)
{
// valid triangle coordinates for filling can include the bottom and
// right clip edges, due to the fill rule; these shouldn't be drawn
if ((fv->v[0] < r_refdef.vrectright) &&
(fv->v[1] < r_refdef.vrectbottom))
{
z = fv->v[5]>>16;
if (fv->v[1] < 0 || fv->v[0] < 0) //FIXME: temp
continue;
zbuf = zspantable[fv->v[1]] + fv->v[0];
if (z >= *zbuf)
{
qbyte *pix;
qbyte *out;
*zbuf = z;
pix = (qbyte *)(((unsigned int *)((unsigned int **)skintable)[fv->v[3]>>16]) + (fv->v[2]>>16));
// pix = ((qbyte *)acolormap)[pix + (fv->v[4] & 0xFF00) ];
out = d_viewbuffer + ((d_scantable[fv->v[1]] + fv->v[0])<<2);
out[0] = (out[0]*transbackfac + pix[0] * transfactor)/255;
out[1] = (out[1]*transbackfac + pix[1] * transfactor)/255;
out[2] = (out[2]*transbackfac + pix[2] * transfactor)/255;
}
}
}
}
void D_PolysetDrawFinalVerts32 (finalvert_t *fv, int numverts)
{
int i, z;
short *zbuf;
for (i=0 ; i<numverts ; i++, fv++)
{
// valid triangle coordinates for filling can include the bottom and
// right clip edges, due to the fill rule; these shouldn't be drawn
if ((fv->v[0] < r_refdef.vrectright) &&
(fv->v[1] < r_refdef.vrectbottom))
{
z = fv->v[5]>>16;
if (fv->v[1] < 0 || fv->v[0] < 0) //FIXME: temp
continue;
zbuf = zspantable[fv->v[1]] + fv->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = ((unsigned int *)((unsigned int **)skintable)[fv->v[3]>>16])[fv->v[2]>>16];
// pix = ((qbyte *)acolormap)[pix + (fv->v[4] & 0xFF00) ];
((unsigned int *)d_viewbuffer)[d_scantable[fv->v[1]] + fv->v[0]] = pix;
}
}
}
}
void D_PolysetRecursiveTriangleTrans (int *lp1, int *lp2, int *lp3)
{
int *temp;
int d;
int newt[6];
int z;
short *zbuf;
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
d = lp3[0] - lp2[0];
if (d < -1 || d > 1)
goto split2;
d = lp3[1] - lp2[1];
if (d < -1 || d > 1)
goto split2;
d = lp1[0] - lp3[0];
if (d < -1 || d > 1)
goto split3;
d = lp1[1] - lp3[1];
if (d < -1 || d > 1)
{
split3:
temp = lp1;
lp1 = lp3;
lp3 = lp2;
lp2 = temp;
goto split;
}
return; // entire tri is filled
split2:
temp = lp1;
lp1 = lp2;
lp2 = lp3;
lp3 = temp;
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
// draw the point if splitting a leading edge
if (lp2[1] > lp1[1])
goto nodraw;
if ((lp2[1] == lp1[1]) && (lp2[0] < lp1[0]))
goto nodraw;
z = newt[5]>>16;
zbuf = zspantable[newt[1]] + newt[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = d_pcolormap[apalremap[skintable[newt[3]>>16][newt[2]>>16]]];
d_viewbuffer[d_scantable[newt[1]] + newt[0]] = Trans(d_viewbuffer[d_scantable[newt[1]] + newt[0]], (unsigned char)pix);
}
nodraw:
// recursively continue
D_PolysetRecursiveTriangleTrans (lp3, lp1, newt);
D_PolysetRecursiveTriangleTrans (lp3, newt, lp2);
}
void D_PolysetRecursiveTriangle32Trans (int *lp1, int *lp2, int *lp3)
{
int *temp;
int d;
int newt[6];
int z;
short *zbuf;
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
d = lp3[0] - lp2[0];
if (d < -1 || d > 1)
goto split2;
d = lp3[1] - lp2[1];
if (d < -1 || d > 1)
goto split2;
d = lp1[0] - lp3[0];
if (d < -1 || d > 1)
goto split3;
d = lp1[1] - lp3[1];
if (d < -1 || d > 1)
{
split3:
temp = lp1;
lp1 = lp3;
lp3 = lp2;
lp2 = temp;
goto split;
}
return; // entire tri is filled
split2:
temp = lp1;
lp1 = lp2;
lp2 = lp3;
lp3 = temp;
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
// draw the point if splitting a leading edge
if (lp2[1] > lp1[1])
goto nodraw;
if ((lp2[1] == lp1[1]) && (lp2[0] < lp1[0]))
goto nodraw;
z = newt[5]>>16;
if ((newt[1]>=vid.height|| newt[1] < 0 || newt[0] >= vid.width || newt[0]<0)) //fixme: temp
return;
zbuf = zspantable[newt[1]] + newt[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = ((unsigned int *)((unsigned int **)skintable)[newt[3]>>16])[newt[2]>>16];
// pix = d_pcolormap[skintable[new[3]>>16][new[2]>>16]];
((unsigned int *)d_viewbuffer)[d_scantable[newt[1]] + newt[0]] = pix;//d_8to32table[pix];
}
nodraw:
// recursively continue
D_PolysetRecursiveTriangle32Trans (lp3, lp1, newt);
D_PolysetRecursiveTriangle32Trans (lp3, newt, lp2);
}
void D_PolysetRecursiveTriangle16 (int *lp1, int *lp2, int *lp3)
{
int *temp;
int d;
int newt[6];
int z;
short *zbuf;
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
d = lp3[0] - lp2[0];
if (d < -1 || d > 1)
goto split2;
d = lp3[1] - lp2[1];
if (d < -1 || d > 1)
goto split2;
d = lp1[0] - lp3[0];
if (d < -1 || d > 1)
goto split3;
d = lp1[1] - lp3[1];
if (d < -1 || d > 1)
{
split3:
temp = lp1;
lp1 = lp3;
lp3 = lp2;
lp2 = temp;
goto split;
}
return; // entire tri is filled
split2:
temp = lp1;
lp1 = lp2;
lp2 = lp3;
lp3 = temp;
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
// draw the point if splitting a leading edge
if (lp2[1] > lp1[1])
goto nodraw;
if ((lp2[1] == lp1[1]) && (lp2[0] < lp1[0]))
goto nodraw;
z = newt[5]>>16;
if ((newt[1]>=vid.height|| newt[1] < 0 || newt[0] >= vid.width || newt[0]<0)) //fixme: temp
return;
zbuf = zspantable[newt[1]] + newt[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = ((unsigned short *)d_pcolormap)[skintable[newt[3]>>16][newt[2]>>16]];
((unsigned short *)d_viewbuffer)[d_scantable[newt[1]] + newt[0]] = pix;//d_8to32table[pix];
}
nodraw:
// recursively continue
D_PolysetRecursiveTriangle16 (lp3, lp1, newt);
D_PolysetRecursiveTriangle16 (lp3, newt, lp2);
}
void D_PolysetDrawSpans8Trans (spanpackage_t *pspanpackage)
{
int lcount;
qbyte *lpdest;
qbyte *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
if (d_aspancount<0)
return;
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)
{
*lpdest = Trans(*lpdest, ((qbyte *)acolormap)[apalremap[*lptex] + (llight & 0xFF00)]);
// gel mapping *lpdest = gelmap[*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 D_PolysetDrawSpans32Trans (spanpackage_t *pspanpackage)
{
int lcount;
qbyte *lpdest;
qbyte *lptex;
int tex;
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;
tex = pspanpackage->ptex-(qbyte *)r_affinetridesc.pskin;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
extern qbyte gammatable[256];
// ((qbyte *)acolormap)[*lptex + (llight & 0xFF00)];
lptex = (qbyte *)((unsigned int *)r_affinetridesc.pskin+tex);
#if 0
lpdest[0] = ((qbyte *)acolormap)[lptex[0] + (llight & 0xFF00)];
lpdest[1] = ((qbyte *)acolormap)[lptex[1] + (llight & 0xFF00)];
lpdest[2] = ((qbyte *)acolormap)[lptex[2] + (llight & 0xFF00)];
#else
lpdest[0] = (lpdest[0]*transbackfac + gammatable[(lptex[0]*(llight&0x3FFF))/(0x3FFF)]*transfactor)/255;
lpdest[1] = (lpdest[1]*transbackfac + gammatable[(lptex[1]*(llight&0x3FFF))/(0x3FFF)]*transfactor)/255;
lpdest[2] = (lpdest[2]*transbackfac + gammatable[(lptex[2]*(llight&0x3FFF))/(0x3FFF)]*transfactor)/255;
#endif
*lpz = lzi >> 16;
}
lpdest+=4;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
tex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
tex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
tex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
void D_PolysetDrawSpans32 (spanpackage_t *pspanpackage)
{
int lcount;
qbyte *lpdest;
qbyte *lptex;
int tex;
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;
tex = pspanpackage->ptex-(qbyte *)r_affinetridesc.pskin;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
extern qbyte gammatable[256];
// ((qbyte *)acolormap)[*lptex + (llight & 0xFF00)];
lptex = (qbyte *)((unsigned int *)r_affinetridesc.pskin+tex);
#if 0
lpdest[0] = ((qbyte *)acolormap)[lptex[0] + (llight & 0xFF00)];
lpdest[1] = ((qbyte *)acolormap)[lptex[1] + (llight & 0xFF00)];
lpdest[2] = ((qbyte *)acolormap)[lptex[2] + (llight & 0xFF00)];
#else
lpdest[0] = gammatable[(lptex[0]*(llight&0x3FFF))/(0x3FFF)];
lpdest[1] = gammatable[(lptex[1]*(llight&0x3FFF))/(0x3FFF)];
lpdest[2] = gammatable[(lptex[2]*(llight&0x3FFF))/(0x3FFF)];
#endif
*lpz = lzi >> 16;
}
lpdest+=4;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
tex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
tex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
tex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
void D_PolysetDrawSpans16 (spanpackage_t *pspanpackage)
{
int lcount;
unsigned short *lpdest;
qbyte *lptex;
int tex;
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;
tex = pspanpackage->ptex-(qbyte *)r_affinetridesc.pskin;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) >= *lpz)
{
// ((qbyte *)acolormap)[*lptex + (llight & 0xFF00)];
lptex = (qbyte *)((unsigned char *)r_affinetridesc.pskin+tex);
lpdest[0] = ((unsigned short *)acolormap)[apalremap[*lptex] + (llight & 0xFF00)];
*lpz = lzi >> 16;
}
lpdest++;
lzi += r_zistepx;
lpz++;
llight += r_lstepx;
tex += a_ststepxwhole;
lsfrac += a_sstepxfrac;
tex += lsfrac >> 16;
lsfrac &= 0xFFFF;
ltfrac += a_tstepxfrac;
if (ltfrac & 0x10000)
{
tex += r_affinetridesc.skinwidth;
ltfrac &= 0xFFFF;
}
} while (--lcount);
}
pspanpackage++;
} while (pspanpackage->count != -999999);
}
void D_RasterizeAliasPolySmoothC (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
//
D_PolysetCalcGradientsC (r_affinetridesc.skinwidth); //D_PolysetCalcGradients32 but not with asm possibilities
//
// rasterize the polygon
//
//
// scan out the top (and possibly only) part of the left edge
//
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
d_pedgespanpackage = a_spans;
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (qbyte *)r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
d_sfrac = plefttop[2] & 0xFFFF;
d_tfrac = plefttop[3] & 0xFFFF;
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer + (ystart * screenwidth + plefttop[0])*r_pixbytes;
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
// 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;
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
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;
d_sfracextrastep = (r_sstepy + r_sstepx*d_countextrastep) & 0xFFFF;
d_tfracextrastep = (r_tstepy + r_tstepx*d_countextrastep) & 0xFFFF;
d_lightextrastep = d_lightbasestep + working_lstepx;
d_ziextrastep = d_zibasestep + r_zistepx;
D_PolysetScanLeftEdgeC (initialleftheight);
//
// scan out the bottom part of the left edge, if it exists
//
if (pedgetable->numleftedges == 2)
{
int height;
plefttop = pleftbottom;
pleftbottom = pedgetable->pleftedgevert2;
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
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 = (qbyte *)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_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer + (ystart * screenwidth + plefttop[0])*r_pixbytes;
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
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;
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
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;
d_sfracextrastep = (r_sstepy+r_sstepx*d_countextrastep) & 0xFFFF;
d_tfracextrastep = (r_tstepy+r_tstepx*d_countextrastep) & 0xFFFF;
d_lightextrastep = d_lightbasestep + working_lstepx;
d_ziextrastep = d_zibasestep + r_zistepx;
D_PolysetScanLeftEdgeC (height);
}
// scan out the top (and possibly only) part of the right edge, updating the
// count field
d_pedgespanpackage = a_spans;
D_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
if (r_pixbytes == 4)
{
if (transbackfac)
D_PolysetDrawSpans32Trans (a_spans);
else
D_PolysetDrawSpans32 (a_spans);
}
else if (r_pixbytes == 2)
D_PolysetDrawSpans16 (a_spans);
else
{
if (transbackfac)
D_PolysetDrawSpans8Trans (a_spans);
else
D_PolysetDrawSpans8C (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];
D_PolysetSetUpForLineScan(prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_countextrastep = ubasestep + 1;
a_spans[initialrightheight + height].count = -999999;
// mark end of the spanpackages
if (r_pixbytes == 4)
{
if (transbackfac)
D_PolysetDrawSpans32Trans (pstart);
else
D_PolysetDrawSpans32 (pstart);
}
else if (r_pixbytes == 2)
D_PolysetDrawSpans16 (pstart);
else
{
if (transbackfac)
D_PolysetDrawSpans8Trans (pstart);
else
D_PolysetDrawSpans8C (pstart);
}
}
}
void D_PolysetDraw32 (void)
{
spanpackage_t spans[DPS_MAXSPANS + 1 +
((CACHE_SIZE - 1) / sizeof(spanpackage_t)) + 1];
// one extra because of cache line pretouching
a_spans = (spanpackage_t *)
(((long)&spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
if (r_affinetridesc.drawtype)
{
D_DrawSubdivC ();
}
else
{
D_DrawNonSubdiv32C ();
}
}
void D_PolysetDraw16 (void)
{
spanpackage_t spans[DPS_MAXSPANS + 1 +
((CACHE_SIZE - 1) / sizeof(spanpackage_t)) + 1];
// one extra because of cache line pretouching
a_spans = (spanpackage_t *)
(((long)&spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
/*
if (r_affinetridesc.drawtype)
{
D_DrawNonSubdiv (); //hrm.
}
else
*/
{
D_DrawNonSubdivC ();
}
}
/*
================
D_PolysetDraw
================
*/
void D_PolysetDrawC (void)
{
spanpackage_t spans[DPS_MAXSPANS + 1 +
((CACHE_SIZE - 1) / sizeof(spanpackage_t)) + 1];
// one extra because of cache line pretouching
a_spans = (spanpackage_t *)
(((long)&spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
if (r_affinetridesc.drawtype)
{
D_DrawSubdivC ();
}
else
{
D_DrawNonSubdivC ();
}
}
/*
================
D_PolysetDrawFinalVerts
================
*/
void D_PolysetDrawFinalVertsC (finalvert_t *fv, int numverts)
{
int i, z;
short *zbuf;
for (i=0 ; i<numverts ; i++, fv++)
{
// valid triangle coordinates for filling can include the bottom and
// right clip edges, due to the fill rule; these shouldn't be drawn
if ((fv->v[0] < r_refdef.vrectright) &&
(fv->v[1] < r_refdef.vrectbottom))
{
z = fv->v[5]>>16;
zbuf = zspantable[fv->v[1]] + fv->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = skintable[fv->v[3]>>16][fv->v[2]>>16];
pix = ((qbyte *)acolormap)[apalremap[pix] + (fv->v[4] & 0xFF00) ];
d_viewbuffer[d_scantable[fv->v[1]] + fv->v[0]] = pix;
}
}
}
}
void D_PolysetDrawFinalVerts16C (finalvert_t *fv, int numverts)
{
int i, z;
short *zbuf;
for (i=0 ; i<numverts ; i++, fv++)
{
// valid triangle coordinates for filling can include the bottom and
// right clip edges, due to the fill rule; these shouldn't be drawn
if ((fv->v[0] < r_refdef.vrectright) &&
(fv->v[1] < r_refdef.vrectbottom))
{
z = fv->v[5]>>16;
zbuf = zspantable[fv->v[1]] + fv->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = skintable[fv->v[3]>>16][fv->v[2]>>16];
pix = ((unsigned short *)acolormap)[apalremap[pix] + (fv->v[4] & 0xFF00) ];
((unsigned short*)d_viewbuffer)[d_scantable[fv->v[1]] + fv->v[0]] = pix;
}
}
}
}
/*
================
D_DrawSubdiv
================
recursivly draws triangles (as opposed to spanned triangles).
used on distant models as it's cheaper than generating spans on small models.
*/
void D_DrawSubdivC (void)
{
mtriangle_t *ptri;
finalvert_t *pfv, *index0, *index1, *index2;
int i;
int lnumtriangles;
void (*drawfnc) (int *p1, int *p2, int *p3);
mstvert_t *pst, *stv;
pst = r_affinetridesc.pstverts;
pfv = r_affinetridesc.pfinalverts;
ptri = r_affinetridesc.ptriangles;
lnumtriangles = r_affinetridesc.numtriangles;
#ifdef PEXT_TRANS
if (transbackfac)
{
if (r_pixbytes == 4)
drawfnc = D_PolysetRecursiveTriangle32Trans;
else if (r_pixbytes == 2)
drawfnc = D_PolysetRecursiveTriangle16C;
else //if (r_pixbytes == 1)
drawfnc = D_PolysetRecursiveTriangleTrans;
}
else
#endif
if (r_pixbytes == 2)
drawfnc = D_PolysetRecursiveTriangle16C;
else
drawfnc = D_PolysetRecursiveTriangleC;
for (i=0 ; i<lnumtriangles ; i++)
{
index0 = pfv + ptri[i].xyz_index[0];
index1 = pfv + ptri[i].xyz_index[1];
index2 = pfv + ptri[i].xyz_index[2];
if (((index0->v[1]-index1->v[1]) *
(index0->v[0]-index2->v[0]) -
(index0->v[0]-index1->v[0]) *
(index0->v[1]-index2->v[1])) >= 0)
{
continue;
}
stv = pst + ptri[i].st_index[0];
index0->v[2] = stv->s;
index0->v[3] = stv->t;
stv = pst + ptri[i].st_index[1];
index1->v[2] = stv->s;
index1->v[3] = stv->t;
stv = pst + ptri[i].st_index[2];
index2->v[2] = stv->s;
index2->v[3] = stv->t;
/*
{
int z;
short *zbuf;
z = index0->v[5]>>16;
zbuf = zspantable[index0->v[1]] + index0->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = skintable[index0->v[3]>>16][index0->v[2]>>16];
pix = ((qbyte *)acolormap)[apalremap[pix] + (index0->v[4] & 0xFF00) ];
d_viewbuffer[d_scantable[index0->v[1]] + index0->v[0]] = pix;//Trans(d_viewbuffer[d_scantable[index0->v[1]] + index0->v[0]], pix);
}
}
{
int z;
short *zbuf;
z = index1->v[5]>>16;
zbuf = zspantable[index1->v[1]] + index1->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = skintable[index1->v[3]>>16][index1->v[2]>>16];
pix = ((qbyte *)acolormap)[apalremap[pix] + (index0->v[4] & 0xFF00) ];
d_viewbuffer[d_scantable[index1->v[1]] + index1->v[0]] = pix;//Trans(d_viewbuffer[d_scantable[index0->v[1]] + index0->v[0]], pix);
}
}
{
int z;
short *zbuf;
z = index2->v[5]>>16;
zbuf = zspantable[index2->v[1]] + index2->v[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = skintable[index2->v[3]>>16][index2->v[2]>>16];
pix = ((qbyte *)acolormap)[apalremap[pix] + (index0->v[4] & 0xFF00) ];
d_viewbuffer[d_scantable[index2->v[1]] + index2->v[0]] = pix;//Trans(d_viewbuffer[d_scantable[index0->v[1]] + index0->v[0]], pix);
}
}
*/
d_pcolormap = &((qbyte *)acolormap)[index0->v[4] & 0xFF00];
drawfnc(index0->v, index1->v, index2->v);
}
}
/*
================
D_DrawNonSubdiv
================
*/
void D_DrawNonSubdivC (void)
{
mtriangle_t *ptri;
finalvert_t *pfv, *index0, *index1, *index2;
int i;
int lnumtriangles;
mstvert_t *pst, *stv;
pst = r_affinetridesc.pstverts;
pfv = r_affinetridesc.pfinalverts;
ptri = r_affinetridesc.ptriangles;
lnumtriangles = r_affinetridesc.numtriangles;
for (i=0 ; i<lnumtriangles ; i++, ptri++)
{
index0 = pfv + ptri->xyz_index[0];
index1 = pfv + ptri->xyz_index[1];
index2 = pfv + ptri->xyz_index[2];
d_xdenom = (index0->v[1]-index1->v[1]) *
(index0->v[0]-index2->v[0]) -
(index0->v[0]-index1->v[0])*(index0->v[1]-index2->v[1]);
if (d_xdenom >= 0)
{
continue;
}
r_p0[0] = index0->v[0]; // u
r_p0[1] = index0->v[1]; // v
stv = pst + ptri->st_index[0];
r_p0[2] = stv->s; // s
r_p0[3] = stv->t; // t
r_p0[4] = index0->v[4]; // light
r_p0[5] = index0->v[5]; // iz
r_p1[0] = index1->v[0];
r_p1[1] = index1->v[1];
stv = pst + ptri->st_index[1];
r_p1[2] = stv->s;
r_p1[3] = stv->t;
r_p1[4] = index1->v[4];
r_p1[5] = index1->v[5];
r_p2[0] = index2->v[0];
r_p2[1] = index2->v[1];
stv = pst + ptri->st_index[2];
r_p2[2] = stv->s;
r_p2[3] = stv->t;
r_p2[4] = index2->v[4];
r_p2[5] = index2->v[5];
D_PolysetSetEdgeTable ();
D_RasterizeAliasPolySmoothC ();
}
}
void D_DrawNonSubdiv32C (void)
{
mtriangle_t *ptri;
finalvert_t *pfv, *index0, *index1, *index2;
int i;
int lnumtriangles;
mstvert_t *pst, *stv;
pst = r_affinetridesc.pstverts;
pfv = r_affinetridesc.pfinalverts;
ptri = r_affinetridesc.ptriangles;
lnumtriangles = r_affinetridesc.numtriangles;
for (i=0 ; i<lnumtriangles ; i++, ptri++)
{
index0 = pfv + ptri->xyz_index[0];
index1 = pfv + ptri->xyz_index[1];
index2 = pfv + ptri->xyz_index[2];
d_xdenom = (index0->v[1]-index1->v[1]) *
(index0->v[0]-index2->v[0]) -
(index0->v[0]-index1->v[0])*(index0->v[1]-index2->v[1]);
if (d_xdenom >= 0)
{
continue;
}
r_p0[0] = index0->v[0]; // u
r_p0[1] = index0->v[1]; // v
stv = pst + ptri->st_index[0];
r_p0[2] = stv->s;//index0->v[2]; // s
r_p0[3] = stv->t;//index0->v[3]; // t
r_p0[4] = index0->v[4]; // light
r_p0[5] = index0->v[5]; // iz
r_p1[0] = index1->v[0];
r_p1[1] = index1->v[1];
stv = pst + ptri->st_index[1];
r_p1[2] = stv->s;//index1->v[2];
r_p1[3] = stv->t;//index1->v[3];
r_p1[4] = index1->v[4];
r_p1[5] = index1->v[5];
r_p2[0] = index2->v[0];
r_p2[1] = index2->v[1];
stv = pst + ptri->st_index[2];
r_p2[2] = stv->s;//index2->v[2];
r_p2[3] = stv->t;//index2->v[3];
r_p2[4] = index2->v[4];
r_p2[5] = index2->v[5];
D_PolysetSetEdgeTable ();
D_RasterizeAliasPolySmoothC ();
}
}
/*
================
D_PolysetRecursiveTriangle
================
*/
void D_PolysetRecursiveTriangleC (int *lp1, int *lp2, int *lp3)
{
int *temp;
int d;
int newt[6];
int z;
short *zbuf;
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
d = lp3[0] - lp2[0];
if (d < -1 || d > 1)
goto split2;
d = lp3[1] - lp2[1];
if (d < -1 || d > 1)
goto split2;
d = lp1[0] - lp3[0];
if (d < -1 || d > 1)
goto split3;
d = lp1[1] - lp3[1];
if (d < -1 || d > 1)
{
split3:
temp = lp1;
lp1 = lp3;
lp3 = lp2;
lp2 = temp;
goto split;
}
return; // entire tri is filled
split2:
temp = lp1;
lp1 = lp2;
lp2 = lp3;
lp3 = temp;
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
// draw the point if splitting a leading edge
if (lp2[1] > lp1[1])
goto nodraw;
if ((lp2[1] == lp1[1]) && (lp2[0] < lp1[0]))
goto nodraw;
z = newt[5]>>16;
zbuf = zspantable[newt[1]] + newt[0];
if (z >= *zbuf)
{
int pix;
*zbuf = z;
pix = d_pcolormap[apalremap[skintable[newt[3]>>16][newt[2]>>16]]];
d_viewbuffer[d_scantable[newt[1]] + newt[0]] = pix;
}
nodraw:
// recursively continue
D_PolysetRecursiveTriangleC (lp3, lp1, newt);
D_PolysetRecursiveTriangleC (lp3, newt, lp2);
}
void D_PolysetRecursiveTriangle16C (int *lp1, int *lp2, int *lp3)
{
int *temp;
int d;
int newt[6];
int z;
short *zbuf;
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
d = lp3[0] - lp2[0];
if (d < -1 || d > 1)
goto split2;
d = lp3[1] - lp2[1];
if (d < -1 || d > 1)
goto split2;
d = lp1[0] - lp3[0];
if (d < -1 || d > 1)
goto split3;
d = lp1[1] - lp3[1];
if (d < -1 || d > 1)
{
split3:
temp = lp1;
lp1 = lp3;
lp3 = lp2;
lp2 = temp;
goto split;
}
return; // entire tri is filled
split2:
temp = lp1;
lp1 = lp2;
lp2 = lp3;
lp3 = temp;
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
// draw the point if splitting a leading edge
if (lp2[1] > lp1[1])
goto nodraw;
if ((lp2[1] == lp1[1]) && (lp2[0] < lp1[0]))
goto nodraw;
z = newt[5]>>16;
zbuf = zspantable[newt[1]] + newt[0];
if (z >= *zbuf)
{
int pix;
// lptex = (qbyte *)((unsigned char *)r_affinetridesc.pskin+tex);
// lpdest[0] = ((unsigned short *)acolormap)[apalremap[*lptex] + (llight & 0xFF00)];
*zbuf = z;
pix = skintable[newt[3]>>16][newt[2]>>16];
((unsigned short *)d_viewbuffer)[d_scantable[newt[1]] + newt[0]] = pix;
}
nodraw:
// recursively continue
D_PolysetRecursiveTriangle16C (lp3, lp1, newt);
D_PolysetRecursiveTriangle16C (lp3, newt, lp2);
}
/*
================
D_PolysetUpdateTables
================
*/
void D_PolysetUpdateTables (void)
{
int i;
qbyte *s;
if (r_affinetridesc.skinwidth*r_pixbytes != skinwidth ||
r_affinetridesc.pskin != skinstart)
{
skinwidth = r_affinetridesc.skinwidth*r_pixbytes;
skinstart = r_affinetridesc.pskin;
s = skinstart;
for (i=0 ; i<MAX_LBM_HEIGHT ; i++, s+=skinwidth)
skintable[i] = s;
}
}
/*
===================
D_PolysetScanLeftEdge
====================
*/
void D_PolysetScanLeftEdgeC (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);
}
/*
===================
D_PolysetSetUpForLineScan
====================
*/
void D_PolysetSetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,
fixed8_t endvertu, fixed8_t endvertv)
{
double 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 = (double)tm;
dn = (double)tn;
FloorDivMod (dm, dn, &ubasestep, &erroradjustup);
erroradjustdown = dn;
}
}
#if !id386
/*
================
D_PolysetCalcGradients
================
*/
void D_PolysetCalcGradientsAsm (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 id386
a_sstepxfrac = r_sstepx << 16;
a_tstepxfrac = r_tstepx << 16;
#else
a_sstepxfrac = r_sstepx & 0xFFFF;
a_tstepxfrac = r_tstepx & 0xFFFF;
#endif
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
}
#endif // !id386
void D_PolysetCalcGradientsC (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);
a_sstepxfrac = r_sstepx & 0xFFFF;
a_tstepxfrac = r_tstepx & 0xFFFF;
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
}
#if 0
qbyte gelmap[256];
void InitGel (qbyte *palette)
{
int i;
int r;
for (i=0 ; i<256 ; i++)
{
// r = (palette[i*3]>>4);
r = (palette[i*3] + palette[i*3+1] + palette[i*3+2])/(16*3);
gelmap[i] = /* 64 */ 0 + r;
}
}
#endif
/*
================
D_PolysetDrawSpans8
================
*/
void D_PolysetDrawSpans8C (spanpackage_t *pspanpackage)
{
int lcount;
qbyte *lpdest;
qbyte *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)
{
*lpdest = ((qbyte *)acolormap)[apalremap[*lptex] + (llight & 0xFF00)];
// gel mapping *lpdest = gelmap[*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);
}
/*
================
D_RasterizeAliasPolySmooth
================
*/
#if id386
void D_RasterizeAliasPolySmooth8Asm (void)
{
int initialleftheight, initialrightheight;
int *plefttop, *prighttop, *pleftbottom, *prightbottom;
int working_lstepx, originalcount;
void (*DrawSpans) (spanpackage_t *pspanpackage);
if (r_pixbytes == 1)
DrawSpans = D_PolysetDrawSpans8;
else
DrawSpans = D_PolysetDrawSpans16;
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
//
D_PolysetCalcGradientsAsm (r_affinetridesc.skinwidth);
//
// rasterize the polygon
//
//
// scan out the top (and possibly only) part of the left edge
//
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
d_pedgespanpackage = a_spans;
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (qbyte *)r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
//#if id386
d_sfrac = (plefttop[2] & 0xFFFF) << 16;
d_tfrac = (plefttop[3] & 0xFFFF) << 16;
d_pzbasestep = (d_zwidth + ubasestep) << 1;
d_pzextrastep = d_pzbasestep + 2;
//#else
// d_sfrac = plefttop[2] & 0xFFFF;
// d_tfrac = plefttop[3] & 0xFFFF;
// d_pzbasestep = d_zwidth + ubasestep;
// d_pzextrastep = d_pzbasestep + 1;
//#endif
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer +
(ystart * screenwidth + plefttop[0])*r_pixbytes;
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
// 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 id386
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
//#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 id386
d_sfracextrastep = (r_sstepy + r_sstepx*d_countextrastep) << 16;
d_tfracextrastep = (r_tstepy + r_tstepx*d_countextrastep) << 16;
//#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;
D_PolysetScanLeftEdge (initialleftheight);
//
// scan out the bottom part of the left edge, if it exists
//
if (pedgetable->numleftedges == 2)
{
int height;
plefttop = pleftbottom;
pleftbottom = pedgetable->pleftedgevert2;
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
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 = (qbyte *)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_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer + (ystart * screenwidth + plefttop[0])*r_pixbytes;
//#if id386
d_pzbasestep = (d_zwidth + ubasestep) << 1;
d_pzextrastep = d_pzbasestep + 2;
//#else
// d_pzbasestep = d_zwidth + ubasestep;
// d_pzextrastep = d_pzbasestep + 1;
//#endif
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
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 id386
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
//#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 id386
d_sfracextrastep = ((r_sstepy+r_sstepx*d_countextrastep) & 0xFFFF)<<16;
d_tfracextrastep = ((r_tstepy+r_tstepx*d_countextrastep) & 0xFFFF)<<16;
//#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;
D_PolysetScanLeftEdge (height);
}
// scan out the top (and possibly only) part of the right edge, updating the
// count field
d_pedgespanpackage = a_spans;
D_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
DrawSpans (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];
D_PolysetSetUpForLineScan(prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_countextrastep = ubasestep + 1;
a_spans[initialrightheight + height].count = -999999;
// mark end of the spanpackages
DrawSpans (pstart);
}
}
#endif
void D_RasterizeAliasPolySmooth8C (void)
{
int initialleftheight, initialrightheight;
int *plefttop, *prighttop, *pleftbottom, *prightbottom;
int working_lstepx, originalcount;
void (*DrawSpans) (spanpackage_t *pspanpackage);
if (r_pixbytes == 1)
DrawSpans = D_PolysetDrawSpans8C;
else
DrawSpans = D_PolysetDrawSpans16;
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
//
D_PolysetCalcGradientsC (r_affinetridesc.skinwidth);
//
// rasterize the polygon
//
//
// scan out the top (and possibly only) part of the left edge
//
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
d_pedgespanpackage = a_spans;
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (qbyte *)r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
//#if id386
// d_sfrac = (plefttop[2] & 0xFFFF) << 16;
// d_tfrac = (plefttop[3] & 0xFFFF) << 16;
// d_pzbasestep = (d_zwidth + ubasestep) << 1;
// d_pzextrastep = d_pzbasestep + 2;
//#else
d_sfrac = plefttop[2] & 0xFFFF;
d_tfrac = plefttop[3] & 0xFFFF;
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
//#endif
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer +
(ystart * screenwidth + plefttop[0])*r_pixbytes;
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
// 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 id386
// d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
// d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
//#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 id386
// d_sfracextrastep = (r_sstepy + r_sstepx*d_countextrastep) << 16;
// d_tfracextrastep = (r_tstepy + r_tstepx*d_countextrastep) << 16;
//#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;
D_PolysetScanLeftEdge (initialleftheight);
//
// scan out the bottom part of the left edge, if it exists
//
if (pedgetable->numleftedges == 2)
{
int height;
plefttop = pleftbottom;
pleftbottom = pedgetable->pleftedgevert2;
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
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 = (qbyte *)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_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer + (ystart * screenwidth + plefttop[0])*r_pixbytes;
//#if id386
// d_pzbasestep = (d_zwidth + ubasestep) << 1;
// d_pzextrastep = d_pzbasestep + 2;
//#else
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
//#endif
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
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 id386
// d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
// d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
//#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 id386
// d_sfracextrastep = ((r_sstepy+r_sstepx*d_countextrastep) & 0xFFFF)<<16;
// d_tfracextrastep = ((r_tstepy+r_tstepx*d_countextrastep) & 0xFFFF)<<16;
//#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;
D_PolysetScanLeftEdge (height);
}
// scan out the top (and possibly only) part of the right edge, updating the
// count field
d_pedgespanpackage = a_spans;
D_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
DrawSpans (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];
D_PolysetSetUpForLineScan(prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_countextrastep = ubasestep + 1;
a_spans[initialrightheight + height].count = -999999;
// mark end of the spanpackages
DrawSpans (pstart);
}
}
/*
void D_RasterizeAliasPolySmooth1Asm (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
//
D_PolysetCalcGradients (r_affinetridesc.skinwidth);
//
// rasterize the polygon
//
//
// scan out the top (and possibly only) part of the left edge
//
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
d_pedgespanpackage = a_spans;
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (qbyte *)r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
#if id386
d_sfrac = (plefttop[2] & 0xFFFF) << 16;
d_tfrac = (plefttop[3] & 0xFFFF) << 16;
d_pzbasestep = (d_zwidth + ubasestep) << 1;
d_pzextrastep = d_pzbasestep + 2;
#else
d_sfrac = plefttop[2] & 0xFFFF;
d_tfrac = plefttop[3] & 0xFFFF;
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
#endif
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer +
(ystart * screenwidth + plefttop[0])*r_pixbytes;
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
// 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 id386
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
#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 id386
d_sfracextrastep = (r_sstepy + r_sstepx*d_countextrastep) << 16;
d_tfracextrastep = (r_tstepy + r_tstepx*d_countextrastep) << 16;
#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;
D_PolysetScanLeftEdge (initialleftheight);
//
// scan out the bottom part of the left edge, if it exists
//
if (pedgetable->numleftedges == 2)
{
int height;
plefttop = pleftbottom;
pleftbottom = pedgetable->pleftedgevert2;
D_PolysetSetUpForLineScan(plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
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 = (qbyte *)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_pdestbasestep = (screenwidth + ubasestep)*r_pixbytes;
d_pdestextrastep = d_pdestbasestep + r_pixbytes;
d_pdest = (qbyte *)d_viewbuffer + (ystart * screenwidth + plefttop[0])*r_pixbytes;
#if id386
d_pzbasestep = (d_zwidth + ubasestep) << 1;
d_pzextrastep = d_pzbasestep + 2;
#else
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
#endif
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
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 id386
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
#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 id386
d_sfracextrastep = ((r_sstepy+r_sstepx*d_countextrastep) & 0xFFFF)<<16;
d_tfracextrastep = ((r_tstepy+r_tstepx*d_countextrastep) & 0xFFFF)<<16;
#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;
D_PolysetScanLeftEdge (height);
}
// scan out the top (and possibly only) part of the right edge, updating the
// count field
d_pedgespanpackage = a_spans;
D_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_PolysetDrawSpans8 (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];
D_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_PolysetDrawSpans8 (pstart);
}
}
*/
/*
================
D_PolysetSetEdgeTable
================
*/
void D_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];
}
#if 0
void D_PolysetRecursiveDrawLine (int *lp1, int *lp2)
{
int d;
int newt[6];
int ofs;
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
return; // line is completed
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[4] = (lp1[4] + lp2[4]) >> 1;
// draw the point
ofs = d_scantable[newt[1]] + newt[0];
if (newt[5] > d_pzbuffer[ofs])
{
int pix;
d_pzbuffer[ofs] = newt[5];
pix = apalremap[skintable[newt[3]>>16][newt[2]>>16]];
// pix = ((qbyte *)acolormap)[pix + (newt[4] & 0xFF00)];
d_viewbuffer[ofs] = pix;
}
// recursively continue
D_PolysetRecursiveDrawLine (lp1, newt);
D_PolysetRecursiveDrawLine (newt, lp2);
}
void D_PolysetRecursiveTriangle2 (int *lp1, int *lp2, int *lp3)
{
int d;
int newt[4];
d = lp2[0] - lp1[0];
if (d < -1 || d > 1)
goto split;
d = lp2[1] - lp1[1];
if (d < -1 || d > 1)
goto split;
return;
split:
// split this edge
newt[0] = (lp1[0] + lp2[0]) >> 1;
newt[1] = (lp1[1] + lp2[1]) >> 1;
newt[5] = (lp1[5] + lp2[5]) >> 1;
newt[2] = (lp1[2] + lp2[2]) >> 1;
newt[3] = (lp1[3] + lp2[3]) >> 1;
newt[4] = (lp1[4] + lp2[4]) >> 1;
D_PolysetRecursiveDrawLine (newt, lp3);
// recursively continue
D_PolysetRecursiveTriangle (lp1, newt, lp3);
D_PolysetRecursiveTriangle (newt, lp2, lp3);
}
#endif
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