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Polymer: in model preprocessing, implement cos/sin by table lookup.

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This reduces the proportion of time the trig calculations take of the whole
preprocessing from 50% to about 13%.

git-svn-id: https://svn.eduke32.com/eduke32@4060 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2013-09-13 20:23:56 +00:00
parent e94fa7f70f
commit 161217a59a
1 changed files with 31 additions and 9 deletions
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40
polymer/eduke32/build/src/mdsprite.c
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@ -1767,6 +1767,26 @@ static int md3postload_polymer_check(md3model_t *m)
return 1;
}
// Precalculated cos/sin arrays.
static double g_mdcos[256], g_mdsin[256];
static void init_mdtrig_arrays(void)
{
int32_t i;
static int inited;
if (inited)
return;
inited = 1;
for (i=0; i<256; i++)
{
double ang = i * (2 * PI) / 255.0;
g_mdcos[i] = cos(ang);
g_mdsin[i] = sin(ang);
}
}
#endif
int md3postload_polymer(md3model_t *m)
@ -1775,11 +1795,13 @@ int md3postload_polymer(md3model_t *m)
int framei, surfi, verti, trii, i;
md3surf_t *s;
int *numtris;
float lat, lng, vec1[5], vec2[5], mat[9], r;
float vec1[5], vec2[5], mat[9], r;
if (m->head.surfs[0].geometry)
return -1; // already postprocessed
init_mdtrig_arrays();
// let's also repack the geometry to more usable formats
surfi = 0;
@ -1802,18 +1824,18 @@ int md3postload_polymer(md3model_t *m)
verti = 0;
while (verti < (m->head.numframes * s->numverts))
{
// normal extraction from packed spherical coordinates
// FIXME: swapping lat and lng because of npherno's compiler
uint8_t lat = s->xyzn[verti].nlng;
uint8_t lng = s->xyzn[verti].nlat;
s->geometry[(verti * 15) + 0] = s->xyzn[verti].x;
s->geometry[(verti * 15) + 1] = s->xyzn[verti].y;
s->geometry[(verti * 15) + 2] = s->xyzn[verti].z;
// normal extraction from packed spherical coordinates
// FIXME: swapping lat and lng because of npherno's compiler
lat = s->xyzn[verti].nlng * (2 * PI) / 255.0f;
lng = s->xyzn[verti].nlat * (2 * PI) / 255.0f;
s->geometry[(verti * 15) + 3] = cos(lat) * sin(lng);
s->geometry[(verti * 15) + 4] = sin(lat) * sin(lng);
s->geometry[(verti * 15) + 5] = cos(lng);
s->geometry[(verti * 15) + 3] = g_mdcos[lat] * g_mdsin[lng];
s->geometry[(verti * 15) + 4] = g_mdsin[lat] * g_mdsin[lng];
s->geometry[(verti * 15) + 5] = g_mdcos[lng];
verti++;
}