ref: 8070f221ed04c1e5adf9e0c2475c8ddf80ef772e
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); }