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use more simple loop for vertical/horisontal spans

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This commit is contained in:
Denis Pauk 2018-08-01 18:30:47 +03:00
parent 4093a49f0f
commit b46a615eb8
1 changed files with 43 additions and 14 deletions
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57
src/client/refresh/soft/sw_scan.c
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@ -409,17 +409,19 @@ D_DrawSpans16
void
D_DrawSpans16 (espan_t *pspan)
{
int spancount;
unsigned char *pbase;
int snext, tnext, sstep, tstep;
float spancountminus1;
float sdivz8stepu, tdivz8stepu, zi8stepu;
int spancount;
pixel_t *pbase;
int snext, tnext, sstep, tstep;
float spancountminus1;
float sdivz8stepu, tdivz8stepu, zi8stepu;
int texture_filtering;
sstep = 0; // keep compiler happy
tstep = 0; // ditto
pbase = (unsigned char *)cacheblock;
texture_filtering = (int)sw_texture_filtering->value;
sdivz8stepu = d_sdivzstepu * 8;
tdivz8stepu = d_tdivzstepu * 8;
zi8stepu = d_zistepu * 8;
@ -524,19 +526,44 @@ D_DrawSpans16 (espan_t *pspan)
}
// Drawing phrase
if (sw_texture_filtering->value == 0.0f)
if (texture_filtering == 0)
{
do
// horisontal span (span in same row)
if (((t + tstep * spancount) >> SHIFT16XYZ) == (t >> SHIFT16XYZ))
{
*pdest++ = *(pbase + (s >> SHIFT16XYZ) + (t >> SHIFT16XYZ) * cachewidth);
s += sstep;
t += tstep;
} while (--spancount > 0);
// position in texture
const pixel_t *tbase = pbase + (t >> SHIFT16XYZ) * cachewidth;
s = snext;
t = tnext;
do
{
*pdest++ = *(tbase + (s >> SHIFT16XYZ));
s += sstep;
} while (--spancount > 0);
}
// vertical span (span in same column)
else if (((s + sstep * spancount) >> SHIFT16XYZ) == (s >> SHIFT16XYZ))
{
// position in texture
const pixel_t *tbase = pbase + (s >> SHIFT16XYZ);
do
{
*pdest++ = *(tbase + (t >> SHIFT16XYZ) * cachewidth);
t += tstep;
} while (--spancount > 0);
}
// diagonal span
else
{
do
{
*pdest++ = *(pbase + (s >> SHIFT16XYZ) + (t >> SHIFT16XYZ) * cachewidth);
s += sstep;
t += tstep;
} while (--spancount > 0);
}
}
else if (sw_texture_filtering->value == 1.0f)
else
{
do
{
@ -563,6 +590,8 @@ D_DrawSpans16 (espan_t *pspan)
t += tstep;
} while (--spancount > 0);
}
s = snext;
t = tnext;
} while (count > 0);