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Move some sin/cos constants out of a loop

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This commit is contained in:
Chris Robinson 2020-05-04 16:16:55 -07:00
parent 58d953f6aa
commit fcec76663f
1 changed files with 11 additions and 10 deletions
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21
alc/alu.cpp
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@ -1865,22 +1865,23 @@ void ApplyStablizer(FrontStablizer *Stablizer, const al::span<FloatBufferLine> B
apply_splitter(Buffer[lidx], Stablizer->DelayBuf[lidx], Stablizer->LFilter, lsplit);
apply_splitter(Buffer[ridx], Stablizer->DelayBuf[ridx], Stablizer->RFilter, rsplit);
/* This pans the separate low- and high-frequency sums between being on the
* center channel and the left/right channels. The low-frequency sum is
* 1/3rd toward center (2/3rds on left/right) and the high-frequency sum is
* 1/4th toward center (3/4ths on left/right). These values can be tweaked.
*/
const float cos_lf{std::cos(1.0f/3.0f * (al::MathDefs<float>::Pi()*0.5f))};
const float cos_hf{std::cos(1.0f/4.0f * (al::MathDefs<float>::Pi()*0.5f))};
const float sin_lf{std::sin(1.0f/3.0f * (al::MathDefs<float>::Pi()*0.5f))};
const float sin_hf{std::sin(1.0f/4.0f * (al::MathDefs<float>::Pi()*0.5f))};
for(ALuint i{0};i < SamplesToDo;i++)
{
float lfsum{lsplit[0][i] + rsplit[0][i]};
float hfsum{lsplit[1][i] + rsplit[1][i]};
float s{lsplit[0][i] + lsplit[1][i] - rsplit[0][i] - rsplit[1][i]};
/* This pans the separate low- and high-frequency sums between being on
* the center channel and the left/right channels. The low-frequency
* sum is 1/3rd toward center (2/3rds on left/right) and the high-
* frequency sum is 1/4th toward center (3/4ths on left/right). These
* values can be tweaked.
*/
float m{lfsum*std::cos(1.0f/3.0f * (al::MathDefs<float>::Pi()*0.5f)) +
hfsum*std::cos(1.0f/4.0f * (al::MathDefs<float>::Pi()*0.5f))};
float c{lfsum*std::sin(1.0f/3.0f * (al::MathDefs<float>::Pi()*0.5f)) +
hfsum*std::sin(1.0f/4.0f * (al::MathDefs<float>::Pi()*0.5f))};
float m{lfsum*cos_lf + hfsum*cos_hf};
float c{lfsum*sin_lf + hfsum*sin_hf};
/* The generated center channel signal adds to the existing signal,
* while the modified left and right channels replace.