AuroraMiddleware/AuroraOpenALSoft
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fix HRTF index calculations for B-Format coefficients

Browse Source 
The CalcEvIndices and CalcAzIndices methods were dependent on the FPU being in
round-to-zero mode, which is not the case for panning initialization. And since
we just need the closest index and don't need to lerp between them, it's better
to just directly calculate the index with rounding.
This commit is contained in:
Chris Robinson 2016-08-18 23:33:08 -07:00
parent e13c6bca20
commit d16954c34e
1 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
Alc/hrtf.c
View File

@ -206,26 +206,25 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][
for(c = 0;c < 8;c++)
{
ALuint evidx[2];
ALuint evidx, azidx;
ALuint evoffset;
ALuint azidx[2];
ALuint azcount;
ALfloat mu;
/* Calculate elevation index. */
CalcEvIndices(Hrtf->evCount, CubePoints[c].elevation, evidx, &mu);
if(mu >= 0.5f) evidx[0] = evidx[1];
evidx = (ALuint)floorf((F_PI_2 + CubePoints[c].elevation) *
(Hrtf->evCount-1)/F_PI + 0.5f);
evidx = minu(evidx, Hrtf->evCount-1);
azcount = Hrtf->azCount[evidx[0]];
evoffset = Hrtf->evOffset[evidx[0]];
azcount = Hrtf->azCount[evidx];
evoffset = Hrtf->evOffset[evidx];
/* Calculate azimuth index for this elevation. */
CalcAzIndices(azcount, CubePoints[c].azimuth, azidx, &mu);
if(mu >= 0.5f) azidx[0] = azidx[1];
azidx = (ALuint)floorf((F_TAU+CubePoints[c].azimuth) *
azcount/F_TAU + 0.5f) % azcount;
/* Calculate indices for left and right channels. */
lidx[c] = evoffset + azidx[0];
ridx[c] = evoffset + ((azcount-azidx[0]) % azcount);
lidx[c] = evoffset + azidx;
ridx[c] = evoffset + ((azcount-azidx) % azcount);
min_delay = minu(min_delay, minu(Hrtf->delays[lidx[c]], Hrtf->delays[ridx[c]]));
}