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Further optimization of fading code because I'm crazy 

The less branches, the better.

Optimization is a bitch, you know.
This commit is contained in:
Inuyasha 2016-01-08 08:16:16 -08:00
parent 4eb8ba7bf7
commit fea0a9577a
1 changed files with 35 additions and 17 deletions
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52
src/f_wipe.c
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@ -231,34 +231,52 @@ static void F_DoWipe(fademask_t *fademask)
maskx = masky = 0;
do
{
// pointer to transtable that this mask would use
transtbl = transtables + ((9 - *mask)<<FF_TRANSSHIFT);
// (ignore that it goes out of bounds if *mask is 0 or 10 --
// it wouldn't be used in those cases anyway)
draw_rowstart = scrxpos[maskx];
draw_rowend = scrxpos[maskx + 1];
draw_linestart = scrypos[masky];
draw_lineend = scrypos[masky + 1];
// DRAWING LOOP
relativepos = (draw_linestart * vid.width) + draw_rowstart;
draw_linestogo = draw_lineend - draw_linestart;
while (draw_linestogo--)
if (*mask == 0)
{
w = w_base + relativepos;
s = s_base + relativepos;
e = e_base + relativepos;
draw_rowstogo = draw_rowend - draw_rowstart;
while (draw_rowstogo--)
// shortcut - memcpy source to work
while (draw_linestogo--)
{
if (*s != *e)
*w = ((*mask == 0) ? *s : (*mask == 10) ? *e : transtbl[(*e<<8) + *s]);
++w, ++s, ++e;
M_Memcpy(w_base+relativepos, s_base+relativepos, draw_rowend-draw_rowstart);
relativepos += vid.width;
}
relativepos += vid.width;
}
// END DRAWING LOOP
else if (*mask == 10)
{
// shortcut - memcpy target to work
while (draw_linestogo--)
{
M_Memcpy(w_base+relativepos, e_base+relativepos, draw_rowend-draw_rowstart);
relativepos += vid.width;
}
}
else
{
// pointer to transtable that this mask would use
transtbl = transtables + ((9 - *mask)<<FF_TRANSSHIFT);
// DRAWING LOOP
while (draw_linestogo--)
{
w = w_base + relativepos;
s = s_base + relativepos;
e = e_base + relativepos;
draw_rowstogo = draw_rowend - draw_rowstart;
while (draw_rowstogo--)
*w++ = transtbl[ ( *e++ << 8 ) + *s++ ];
relativepos += vid.width;
}
// END DRAWING LOOP
}
if (++maskx >= fademask->width)
++masky, maskx = 0;