ref: 604d47937d45ebba3ee3b6053bd796b8513e6a3f
dir: /span_alpha.c/
#include <u.h>
#include <libc.h>
#include "dat.h"
#include "quakedef.h"
#define P \
do{ \
if(*z <= (izi >> 16)) \
*pdest = blendalpha(pbase[(s >> 16) + (t >> 16) * cachewidth], *pdest, alpha); \
pdest++; \
z++; \
s += sstep; \
t += tstep; \
}while(0)
void
dospan_alpha(uchar *pdest, uchar *pbase, int s, int t, int sstep, int tstep, int spancount, int cachewidth, u8int alpha, uzint *z, int izi)
{
switch(spancount)
{
case 16: P; case 15: P; case 14: P; case 13: P; case 12: P; case 11: P; case 10: P; case 9: P;
case 8: P; case 7: P; case 6: P; case 5: P; case 4: P; case 3: P; case 2: P; case 1: P;
}
USED(pdest); USED(s); USED(t); USED(z);
}