ref: a2a1e4ddd855afe9caf7ac420dca9aaa9a3de223
dir: /span.c/
#include <u.h>
#include <libc.h>
void
dospan(uchar *pdest, uchar *pbase, int s, int t, int sstep, int tstep, int spancount, int cachewidth)
{
switch(spancount)
{
case 16: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 15: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 14: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 13: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 12: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 11: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 10: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 9: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 8: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 7: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 6: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 5: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 4: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 3: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 2: *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 1: *pdest = pbase[(s >> 16) + (t >> 16) * cachewidth];
}
}