ref: 3d9a179d3de101cf405df256918a7769d02698ee
dir: /span_alpha.c/
#include "quakedef.h" void dospan_alpha(pixel_t *pdest, pixel_t *pbase, int s, int t, int sstep, int tstep, int spancount, int cachewidth, u8int alpha, uzint *pz, int izi, int izistep) { pixel_t pix; if(alpha != 255){ do{ pix = pbase[(s >> 16) + (t >> 16) * cachewidth]; if(opaque(pix) && *pz <= izi) *pdest = blendalpha(pix, *pdest, alpha, izi); pdest++; pz++; izi += izistep; s += sstep; t += tstep; }while(--spancount); }else{ do{ pix = pbase[(s >> 16) + (t >> 16) * cachewidth]; if(opaque(pix) && *pz <= izi){ *pdest = pix; *pz = izi; } pdest++; pz++; izi += izistep; s += sstep; t += tstep; }while(--spancount); } }