From 21b20281229c71989d55a31f249006215f8b1efb Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Wed, 5 Oct 2022 20:57:44 +0300
Subject: [PATCH] Update audio example

---
 examples/audio.cpp | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/examples/audio.cpp b/examples/audio.cpp
index 2576c321..708fd7fd 100644
--- a/examples/audio.cpp
+++ b/examples/audio.cpp
@@ -5,9 +5,13 @@
 #include <psemek/audio/wave/square.hpp>
 #include <psemek/audio/wave/triangle.hpp>
 #include <psemek/audio/effect/volume.hpp>
+#include <psemek/audio/duplicate.hpp>
+#include <psemek/audio/stereo.hpp>
 #include <psemek/audio/mixer.hpp>
 #include <psemek/app/app.hpp>
 #include <psemek/app/main.hpp>
+#include <psemek/util/clock.hpp>
+#include <psemek/geom/constants.hpp>
 
 #include <map>
 
@@ -35,18 +39,12 @@ struct audio_app
 		: app::app("Audio example")
 	{
 		mixer_ = audio::make_mixer();
-		engine_.output(mixer_);
 
-		auto volume = audio::volume(audio::sine_wave(440.f), 1.f, 0.01f);
-		auto channel = mixer_->add(volume);
-		std::this_thread::sleep_for(std::chrono::seconds{1});
-		volume->gain(0.5f);
-		std::this_thread::sleep_for(std::chrono::seconds{1});
-		volume->gain(0.25f);
-		std::this_thread::sleep_for(std::chrono::seconds{1});
-		volume->gain(0.125f);
-		std::this_thread::sleep_for(std::chrono::seconds{1});
-		channel->stop();
+		auto [ dup1, dup2 ] = audio::duplicate(mixer_);
+		left_volume_ = audio::volume(dup1, 0.f, 0.1f);
+		right_volume_ = audio::volume(dup2, 0.f, 0.1f);
+		auto result = audio::stereo(left_volume_, right_volume_);
+		engine_.output(result);
 	}
 
 	void on_key_down(SDL_Keycode key) override
@@ -57,7 +55,7 @@ struct audio_app
 		{
 			int midi = key_to_midi.at(key);
 			auto tone = audio::sine_wave(440.f * std::pow(2.f, (midi - 69) / 12.f));
-			channels_[key] = mixer_->add(audio::volume(tone, 0.5f));
+			channels_[key] = mixer_->add(tone);
 		}
 	}
 
@@ -72,10 +70,22 @@ struct audio_app
 		}
 	}
 
+	void update() override
+	{
+		float const time = clock_.count();
+
+		float volume = std::sin(time);
+		left_volume_->gain(0.5f + 0.5f * volume);
+		right_volume_->gain(0.5f - 0.5f * volume);
+	}
+
 private:
 	audio::engine engine_;
 	audio::mixer_ptr mixer_;
+	std::shared_ptr<audio::volume_control> left_volume_, right_volume_;
 	std::map<SDL_Keycode, audio::mixer::channel_ptr> channels_;
+
+	util::clock<> clock_;
 };
 
 int main()