ref: 7f9c4b6c2d5017d10b370b4e55691b5a2631eb75
dir: /plan9/d_scan.h/
#define dospan_solid(pdest, pbase, s, t, sstep, tstep, spancount, width, pz, izi, izistep)\
{\
if(((t + tstep*spancount) >> 16) == (t >> 16)){\
pbase += (t >> 16) * width;\
do{\
*pdest++ = pbase[s >> 16];\
*pz++ = izi;\
s += sstep;\
izi += izistep;\
}while(--spancount);\
}else if(((s + sstep*spancount) >> 16) == (s >> 16)){\
pbase += s >> 16;\
do{\
*pdest++ = pbase[(t >> 16) * width];\
*pz++ = izi;\
t += tstep;\
izi += izistep;\
}while(--spancount);\
}else{\
do{\
*pdest++ = pbase[(s >> 16) + (t >> 16) * width];\
*pz++ = izi;\
s += sstep;\
t += tstep;\
izi += izistep;\
}while(--spancount);\
}\
}
#define dospan_solid_f1(pdest, pbase, s, t, sstep, tstep, spancount, width, pz, izi, izistep, fog)\
{\
if(((t + tstep*spancount) >> 16) == (t >> 16)){\
pbase += (t >> 16) * width;\
do{\
*pz++ = izi;\
izi += izistep;\
*pdest++ = blendfog(pbase[s >> 16], *fog);\
fogstep(*fog);\
s += sstep;\
}while(--spancount);\
}else if(((s + sstep*spancount) >> 16) == (s >> 16)){\
pbase += s >> 16;\
do{\
*pz++ = izi;\
izi += izistep;\
*pdest++ = blendfog(pbase[(t >> 16) * width], *fog);\
fogstep(*fog);\
t += tstep;\
}while(--spancount);\
}else{\
do{\
*pz++ = izi;\
izi += izistep;\
*pdest++ = blendfog(pbase[(s >> 16) + (t >> 16) * width], *fog);\
fogstep(*fog);\
s += sstep;\
t += tstep;\
}while(--spancount);\
}\
}
#define dospan_blend(pdest, pbase, s, t, sstep, tstep, spancount, width, alpha, pz, izi, izistep)\
{\
pixel_t pix;\
\
if(((t + tstep*spancount) >> 16) == (t >> 16)){\
pbase += (t >> 16) * width;\
do{\
pix = pbase[s >> 16];\
s += sstep;\
if(opaque(pix) && *pz <= izi)\
*pdest = blendalpha(pix, *pdest, alpha);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else if(((s + sstep*spancount) >> 16) == (s >> 16)){\
pbase += s >> 16;\
do{\
pix = pbase[(t >> 16) * width];\
t += tstep;\
if(opaque(pix) && *pz <= izi)\
*pdest = blendalpha(pix, *pdest, alpha);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else{\
do{\
pix = pbase[(s >> 16) + (t >> 16) * width];\
s += sstep;\
t += tstep;\
if(opaque(pix) && *pz <= izi)\
*pdest = blendalpha(pix, *pdest, alpha);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}\
}
#define dospan_blend_f1(pdest, pbase, s, t, sstep, tstep, spancount, width, alpha, pz, izi, izistep, fog)\
{\
pixel_t pix;\
\
if(((t + tstep*spancount) >> 16) == (t >> 16)){\
pbase += (t >> 16) * width;\
do{\
pix = pbase[s >> 16];\
s += sstep;\
if(opaque(pix) && *pz <= izi)\
*pdest = blendalpha(0xff<<24 | blendfog(pix, *fog), *pdest, alpha);\
fogstep(*fog);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else if(((s + sstep*spancount) >> 16) == (s >> 16)){\
pbase += s >> 16;\
do{\
pix = pbase[(t >> 16) * width];\
t += tstep;\
if(opaque(pix) && *pz <= izi)\
*pdest = blendalpha(0xff<<24 | blendfog(pix, *fog), *pdest, alpha);\
fogstep(*fog);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else{\
do{\
pix = pbase[(s >> 16) + (t >> 16) * width];\
s += sstep;\
t += tstep;\
if(opaque(pix) && *pz <= izi)\
*pdest = blendalpha(0xff<<24 | blendfog(pix, *fog), *pdest, alpha);\
fogstep(*fog);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}\
}
#define dospan_fence(pdest, pbase, s, t, sstep, tstep, spancount, width, pz, izi, izistep)\
{\
pixel_t pix;\
\
if(((t + tstep*spancount) >> 16) == (t >> 16)){\
pbase += (t >> 16) * width;\
do{\
pix = pbase[s >> 16];\
s += sstep;\
if(opaque(pix) && *pz <= izi){\
*pdest = pix;\
*pz = izi;\
}\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else if(((s + sstep*spancount) >> 16) == (s >> 16)){\
pbase += s >> 16;\
do{\
pix = pbase[(t >> 16) * width];\
t += tstep;\
if(opaque(pix) && *pz <= izi){\
*pdest = pix;\
*pz = izi;\
}\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else{\
do{\
pix = pbase[(s >> 16) + (t >> 16) * width];\
s += sstep;\
t += tstep;\
if(opaque(pix) && *pz <= izi){\
*pdest = pix;\
*pz = izi;\
}\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}\
}
#define dospan_fence_f1(pdest, pbase, s, t, sstep, tstep, spancount, width, pz, izi, izistep, fog)\
{\
pixel_t pix;\
\
if(((t + tstep*spancount) >> 16) == (t >> 16)){\
pbase += (t >> 16) * width;\
do{\
pix = pbase[s >> 16];\
s += sstep;\
if(opaque(pix) && *pz <= izi){\
*pdest = blendfog(pix, *fog);\
*pz = izi;\
}\
fogstep(*fog);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else if(((s + sstep*spancount) >> 16) == (s >> 16)){\
pbase += s >> 16;\
do{\
pix = pbase[(t >> 16) * width];\
t += tstep;\
if(opaque(pix) && *pz <= izi){\
*pdest = blendfog(pix, *fog);\
*pz = izi;\
}\
fogstep(*fog);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}else{\
do{\
pix = pbase[(s >> 16) + (t >> 16) * width];\
s += sstep;\
t += tstep;\
if(opaque(pix) && *pz <= izi){\
*pdest = blendfog(pix, *fog);\
*pz = izi;\
}\
fogstep(*fog);\
izi += izistep;\
pdest++;\
pz++;\
}while(--spancount);\
}\
}
static void
dospan_turb(pixel_t *pdest, pixel_t *pbase, int s, int t, int sstep, int tstep, int spancount, byte alpha, uzint *pz, uzint izi, int izistep)
{
int sturb, tturb;
bool noblend;
noblend = (r_drawflags & DRAW_BLEND) == 0;
s &= (CYCLE<<16)-1;
t &= (CYCLE<<16)-1;
do{
if(noblend || *pz <= izi){
sturb = ((s + r_turb_turb[(t>>16)&(CYCLE-1)])>>16)&63;
tturb = ((t + r_turb_turb[(s>>16)&(CYCLE-1)])>>16)&63;
*pdest = blendalpha(*(pbase + (tturb<<6) + sturb), *pdest, alpha);
if(noblend)
*pz = izi;
}
s += sstep;
t += tstep;
izi += izistep;
pdest++;
pz++;
}while(--spancount > 0);
}
static void
dospan_turb_f1(pixel_t *pdest, pixel_t *pbase, int s, int t, int sstep, int tstep, int spancount, byte alpha, uzint *pz, uzint izi, int izistep, fog_t *fog)
{
int sturb, tturb;
bool noblend;
noblend = (r_drawflags & DRAW_BLEND) == 0;
s &= (CYCLE<<16)-1;
t &= (CYCLE<<16)-1;
do{
if(noblend || *pz <= izi){
sturb = ((s + r_turb_turb[(t>>16)&(CYCLE-1)])>>16)&63;
tturb = ((t + r_turb_turb[(s>>16)&(CYCLE-1)])>>16)&63;
*pdest = blendalpha(0xff<<24 | blendfog(*(pbase + (tturb<<6) + sturb), *fog), *pdest, alpha);
if(noblend)
*pz = izi;
}
s += sstep;
t += tstep;
izi += izistep;
pdest++;
pz++;
fogstep(*fog);
}while(--spancount > 0);
}