From 87e865d0258209aebca27c78b02f141e9797a61c Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sat, 8 Oct 2022 21:31:38 +0300
Subject: [PATCH] Make sure Karplus-Strong generated sound is the same in both
 channels

---
 libs/audio/source/wave/karplus_strong.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libs/audio/source/wave/karplus_strong.cpp b/libs/audio/source/wave/karplus_strong.cpp
index 4313786d..f166b60a 100644
--- a/libs/audio/source/wave/karplus_strong.cpp
+++ b/libs/audio/source/wave/karplus_strong.cpp
@@ -19,8 +19,12 @@ namespace psemek::audio
 				: buffer_(2 * std::round(audio::frequency / frequency))
 			{
 				random::generator rng{0x4b0a763ef6573bf2ull, 0};
-				for (auto & v : buffer_)
-					v = random::uniform(rng, -1.f, 1.f);
+				for (std::size_t i = 0; i < buffer_.size(); i += 2)
+				{
+					float v = random::uniform(rng, -1.f, 1.f);
+					buffer_[i + 0] = v;
+					buffer_[i + 1] = v;
+				}
 			}
 
 			std::optional<std::size_t> length() const override