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Optimize D_DrawSpans16 for horisontal/vertical spans

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This commit is contained in:
Denis Pauk 2018-08-01 23:17:21 +03:00
parent b46a615eb8
commit 1e3e853bc7
1 changed files with 92 additions and 63 deletions
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153
src/client/refresh/soft/sw_scan.c
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@ -399,6 +399,89 @@ static const int filtering_kernel[2][2][2] = {
}
};
/*
=============
D_DrawSpan
=============
*/
static pixel_t *
D_DrawSpan(pixel_t *pdest, pixel_t *pbase, int s, int t, int sstep, int tstep, int spancount)
{
// horisontal span (span in same row)
if (((t + tstep * spancount) >> SHIFT16XYZ) == (t >> SHIFT16XYZ))
{
// position in texture
const pixel_t *tbase = pbase + (t >> SHIFT16XYZ) * cachewidth;
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);
}
return pdest;
}
/*
=============
D_DrawSpanFiltered
=============
*/
static pixel_t *
D_DrawSpanFiltered(pixel_t *pdest, pixel_t *pbase, int s, int t, int sstep, int tstep, int spancount,
const espan_t *pspan)
{
do
{
int idiths = s;
int iditht = t;
int X = (pspan->u + spancount) & 1;
int Y = (pspan->v)&1;
//Using the kernel
idiths += filtering_kernel[X][Y][0];
iditht += filtering_kernel[X][Y][1];
idiths = idiths >> SHIFT16XYZ;
idiths = idiths ? idiths -1 : idiths;
iditht = iditht >> SHIFT16XYZ;
iditht = iditht ? iditht -1 : iditht;
*pdest++ = *(pbase + idiths + iditht * cachewidth);
s += sstep;
t += tstep;
} while (--spancount > 0);
return pdest;
}
/*
=============
D_DrawSpans16
@ -411,14 +494,11 @@ D_DrawSpans16 (espan_t *pspan)
{
int spancount;
pixel_t *pbase;
int snext, tnext, sstep, tstep;
int snext, tnext;
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;
@ -459,6 +539,8 @@ D_DrawSpans16 (espan_t *pspan)
do
{
int sstep, tstep;
// calculate s and t at the far end of the span
if (count >= 8)
spancount = 8;
@ -528,68 +610,15 @@ D_DrawSpans16 (espan_t *pspan)
// Drawing phrase
if (texture_filtering == 0)
{
// horisontal span (span in same row)
if (((t + tstep * spancount) >> SHIFT16XYZ) == (t >> SHIFT16XYZ))
{
// position in texture
const pixel_t *tbase = pbase + (t >> SHIFT16XYZ) * cachewidth;
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);
}
pdest = D_DrawSpan(pdest, pbase, s, t, sstep, tstep,
spancount);
}
else
{
do
{
int idiths = s;
int iditht = t;
int X = (pspan->u + spancount) & 1;
int Y = (pspan->v)&1;
//Using the kernel
idiths += filtering_kernel[X][Y][0];
iditht += filtering_kernel[X][Y][1];
idiths = idiths >> SHIFT16XYZ;
idiths = idiths ? idiths -1 : idiths;
iditht = iditht >> SHIFT16XYZ;
iditht = iditht ? iditht -1 : iditht;
*pdest++ = *(pbase + idiths + iditht * cachewidth);
s += sstep;
t += tstep;
} while (--spancount > 0);
pdest = D_DrawSpanFiltered(pdest, pbase, s, t, sstep, tstep,
spancount, pspan);
}
s = snext;
t = tnext;