From fcec76663f0ea24dd5d1f477f839ca2e781bf9b3 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 4 May 2020 16:16:55 -0700
Subject: Move some sin/cos constants out of a loop
---
alc/alu.cpp | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
(limited to 'alc/alu.cpp')
diff --git a/alc/alu.cpp b/alc/alu.cpp
index 3e4bb0f0..bf713eda 100644
--- a/alc/alu.cpp
+++ b/alc/alu.cpp
@@ -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.
--
cgit v1.2.3