From 424075047c41b06945801baca104a9ffb23032a3 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 5 Nov 2017 12:49:16 +0100
Subject: Add stddev scalar to sample selection.

---
 src/instrument.cc | 2 +-
 src/powerlist.cc  | 9 ++++++++-
 src/powerlist.h   | 7 +++++--
 src/settings.h    | 5 +++++
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/instrument.cc b/src/instrument.cc
index 466acc1..077ae55 100644
--- a/src/instrument.cc
+++ b/src/instrument.cc
@@ -33,7 +33,7 @@
 Instrument::Instrument(Settings& settings, Random& rand)
 	: settings(settings)
 	, rand(rand)
-	, powerlist(rand)
+	, powerlist(rand, settings)
 {
 	DEBUG(instrument, "new %p\n", this);
 	mod = 1.0;
diff --git a/src/powerlist.cc b/src/powerlist.cc
index b5e7c84..37a13a3 100644
--- a/src/powerlist.cc
+++ b/src/powerlist.cc
@@ -38,6 +38,9 @@
 #endif
 #include <math.h>
 
+#include "random.h"
+#include "settings.h"
+
 /**
  * Minimum sample set size.
  * Smaller means wider 'velocity groups'.
@@ -50,8 +53,9 @@ unsigned int const MIN_SAMPLE_SET_SIZE = 26u;
 //#define AUTO_CALCULATE_POWER
 unsigned int const LOAD_SIZE = 500u;
 
-PowerList::PowerList(Random& rand)
+PowerList::PowerList(Random& rand, Settings& settings)
 	: rand(rand)
+	, settings(settings)
 {
 	power_max = 0;
 	power_min = 100000000;
@@ -204,6 +208,8 @@ void PowerList::finalise()
 
 Sample* PowerList::get(level_t level)
 {
+	auto velocity_stddev = settings.velocity_stddev.load();
+
 	if(!samples.size())
 	{
 		return nullptr; // No samples to choose from.
@@ -226,6 +232,7 @@ Sample* PowerList::get(level_t level)
 	// Cut off mean value with stddev/2 in both ends in order to make room for
 	//  downwards expansion on velocity 0 and upwards expansion on velocity 1.
 	float mean = level * (power_span - stddev) + (stddev / 2.0);
+	stddev *= velocity_stddev;
 
 	float power{0.f};
 
diff --git a/src/powerlist.h b/src/powerlist.h
index 9066ce1..b0938af 100644
--- a/src/powerlist.h
+++ b/src/powerlist.h
@@ -29,12 +29,14 @@
 #include <vector>
 
 #include "sample.h"
-#include "random.h"
+
+class Random;
+class Settings;
 
 class PowerList
 {
 public:
-	PowerList(Random& rand);
+	PowerList(Random& rand, Settings& settings);
 
 	void add(Sample* s);
 	void finalise(); ///< Call this when no more samples will be added.
@@ -49,6 +51,7 @@ private:
 	};
 
 	Random& rand;
+	Settings& settings;
 
 	std::vector<PowerListItem> samples;
 	float power_max;
diff --git a/src/settings.h b/src/settings.h
index 0b73cf2..8f7c057 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -73,6 +73,7 @@ struct Settings
 	Atomic<bool> enable_velocity_modifier{true};
 	Atomic<float> velocity_modifier_falloff{0.5f};
 	Atomic<float> velocity_modifier_weight{0.25f};
+	Atomic<float> velocity_stddev{1.0f};
 
 	Atomic<bool> enable_velocity_randomiser{false};
 	Atomic<float> velocity_randomiser_weight{0.1f};
@@ -113,6 +114,7 @@ struct SettingsGetter
 	SettingRef<bool> enable_velocity_modifier;
 	SettingRef<float> velocity_modifier_falloff;
 	SettingRef<float> velocity_modifier_weight;
+	SettingRef<float> velocity_stddev;
 
 	SettingRef<bool> enable_velocity_randomiser;
 	SettingRef<float> velocity_randomiser_weight;
@@ -147,6 +149,7 @@ struct SettingsGetter
 		, enable_velocity_modifier{settings.enable_velocity_modifier}
 		, velocity_modifier_falloff{settings.velocity_modifier_falloff}
 		, velocity_modifier_weight{settings.velocity_modifier_weight}
+		, velocity_stddev{settings.velocity_stddev}
 		, enable_velocity_randomiser{settings.enable_velocity_randomiser}
 		, velocity_randomiser_weight{settings.velocity_randomiser_weight}
 		, samplerate{settings.samplerate}
@@ -185,6 +188,7 @@ public:
 	Notifier<bool> enable_velocity_modifier;
 	Notifier<float> velocity_modifier_falloff;
 	Notifier<float> velocity_modifier_weight;
+	Notifier<float> velocity_stddev;
 
 	Notifier<bool> enable_velocity_randomiser;
 	Notifier<float> velocity_randomiser_weight;
@@ -225,6 +229,7 @@ public:
 		EVAL(enable_velocity_modifier);
 		EVAL(velocity_modifier_falloff);
 		EVAL(velocity_modifier_weight);
+		EVAL(velocity_stddev);
 
 		EVAL(enable_velocity_randomiser);
 		EVAL(velocity_randomiser_weight);
-- 
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