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-rw-r--r--src/Makefile.am2
-rw-r--r--src/powermap.cc251
-rw-r--r--src/powermap.h76
-rw-r--r--src/settings.h60
4 files changed, 389 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index a8e5c74..09df750 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -58,6 +58,7 @@ libdg_la_SOURCES = \
midimapper.cc \
path.cc \
powerlist.cc \
+ powermap.cc \
random.cc \
sample.cc \
sample_selection.cc \
@@ -113,6 +114,7 @@ EXTRA_DIST = \
path.h \
platform.h \
powerlist.h \
+ powermap.h \
random.h \
range.h \
rangemap.h \
diff --git a/src/powermap.cc b/src/powermap.cc
new file mode 100644
index 0000000..2bb45b7
--- /dev/null
+++ b/src/powermap.cc
@@ -0,0 +1,251 @@
+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ * powermap.cc
+ *
+ * Fri Apr 17 23:06:12 CEST 2020
+ * Copyright 2020 André Nusser
+ * andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "powermap.h"
+
+#include <cassert>
+#include <cmath>
+
+namespace
+{
+
+using Power = Powermap::Power;
+using PowerPair = Powermap::PowerPair;
+
+Power h00(Power x)
+{
+ return (1 + 2 * x) * pow(1 - x, 2);
+}
+
+Power h10(Power x)
+{
+ return x * pow(1 - x, 2);
+}
+
+Power h01(Power x)
+{
+ return x * x * (3 - 2 * x);
+}
+
+Power h11(Power x)
+{
+ return x * x * (x - 1);
+}
+
+Power computeValue(const Power x, const PowerPair& P0, const PowerPair& P1,
+ const Power m0, const Power m1)
+{
+ const auto x0 = P0.in;
+ const auto x1 = P1.in;
+ const auto y0 = P0.out;
+ const auto y1 = P1.out;
+ const auto dx = x1 - x0;
+ const auto x_prime = (x - x0)/dx;
+
+ return
+ h00(x_prime) * y0 +
+ h10(x_prime) * dx * m0 +
+ h01(x_prime) * y1 +
+ h11(x_prime) * dx * m1;
+}
+
+} // end anonymous namespace
+
+Powermap::Powermap()
+{
+ reset();
+}
+
+Power Powermap::map(Power in)
+{
+ assert(in >= 0. && in <= 1.);
+
+ if (spline_needs_update)
+ {
+ updateSpline();
+ }
+
+ Power out;
+ if (in < fixed[0].in)
+ {
+ out = shelf ? fixed[0].out
+ : computeValue(in, {0.,0.}, fixed[0], m[0], m[1]);
+ }
+ else if (in < fixed[1].in)
+ {
+ out = computeValue(in, fixed[0], fixed[1], m[1], m[2]);
+ }
+ else if (in < fixed[2].in)
+ {
+ out = computeValue(in, fixed[1], fixed[2], m[2], m[3]);
+ }
+ else
+ {
+ // in >= fixed[2].in
+ out = shelf ? fixed[2].out
+ : computeValue(in, fixed[2], {1.,1.}, m[3], m[4]);
+ }
+
+ assert(out >= 0. && out <= 1.);
+ return out;
+}
+
+void Powermap::reset()
+{
+ setFixed0({eps, eps});
+ setFixed1({.5, .5});
+ setFixed2({1 - eps, 1 - eps});
+ // FIXME: better false?
+ shelf = true;
+
+ updateSpline();
+}
+
+void Powermap::setFixed0(PowerPair new_value)
+{
+ if (fixed[0] != new_value)
+ {
+ spline_needs_update = true;
+ fixed[0].in = clamp(new_value.in, eps, fixed[1].in - eps);
+ fixed[0].out = clamp(new_value.out, eps, fixed[1].out - eps);
+ }
+}
+
+void Powermap::setFixed1(PowerPair new_value)
+{
+ if (fixed[1] != new_value)
+ {
+ spline_needs_update = true;
+ fixed[1].in = clamp(new_value.in, fixed[0].in + eps, fixed[2].in - eps);
+ fixed[1].out = clamp(new_value.out, fixed[0].out + eps, fixed[2].out - eps);
+ }
+}
+
+void Powermap::setFixed2(PowerPair new_value)
+{
+ if (fixed[2] != new_value)
+ {
+ spline_needs_update = true;
+ fixed[2].in = clamp(new_value.in, fixed[1].in + eps, 1 - eps);
+ fixed[2].out = clamp(new_value.out, fixed[1].out + eps, 1 - eps);
+ }
+}
+
+void Powermap::setShelf(bool enable)
+{
+ if (shelf != enable)
+ {
+ spline_needs_update = true;
+ this->shelf = enable;
+ }
+}
+
+PowerPair Powermap::getFixed0() const
+{
+ return fixed[0];
+}
+
+PowerPair Powermap::getFixed1() const
+{
+ return fixed[1];
+}
+
+PowerPair Powermap::getFixed2() const
+{
+ return fixed[2];
+}
+
+// This mostly followes the wikipedia article for monotone cubic splines:
+// https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
+void Powermap::updateSpline()
+{
+ assert(0. <= fixed[0].in && fixed[0].in < fixed[1].in &&
+ fixed[1].in < fixed[2].in && fixed[2].in <= 1.);
+ assert(0. <= fixed[0].out && fixed[0].out <= fixed[1].out &&
+ fixed[1].out <= fixed[2].out && fixed[2].out <= 1.);
+
+ Powers X = shelf ? Powers{fixed[0].in, fixed[1].in, fixed[2].in}
+ : Powers{0., fixed[0].in, fixed[1].in, fixed[2].in, 1.};
+ Powers Y = shelf ? Powers{fixed[0].out, fixed[1].out, fixed[2].out}
+ : Powers{0., fixed[0].out, fixed[1].out, fixed[2].out, 1.};
+
+ auto slopes = calcSlopes(X, Y);
+
+ if (shelf)
+ {
+ assert(slopes.size() == 3);
+ this->m[1] = slopes[0];
+ this->m[2] = slopes[1];
+ this->m[3] = slopes[2];
+ }
+ else
+ {
+ assert(slopes.size() == 5);
+ for (std::size_t i = 0; i < m.size(); ++i)
+ {
+ this->m[i] = slopes[i];
+ }
+ }
+
+ spline_needs_update = false;
+}
+
+// This follows the monotone cubic spline algorithm of Steffen, from:
+// "A Simple Method for Monotonic Interpolation in One Dimension"
+std::vector<float> Powermap::calcSlopes(const Powers& X, const Powers& Y)
+{
+ Powers m(X.size());
+
+ Powers d(X.size() - 1);
+ Powers h(X.size() - 1);
+ for (std::size_t i = 0; i < d.size(); ++i)
+ {
+ h[i] = X[i + 1] - X[i];
+ d[i] = (Y[i + 1] - Y[i]) / h[i];
+ }
+
+ m.front() = d.front();
+ for (std::size_t i = 1; i < m.size() - 1; ++i)
+ {
+ m[i] = (d[i - 1] + d[i]) / 2.;
+ }
+ m.back() = d.back();
+
+ for (std::size_t i = 1; i < m.size() - 1; ++i)
+ {
+ const auto min_d = 2*std::min(d[i - 1], d[i]);
+ m[i] =
+ std::min<float>(min_d,
+ (h[i] * d[i - 1] + h[i - 1] * d[i]) / (h[i - 1] + h[i]));
+ }
+
+ return m;
+}
+
+Power Powermap::clamp(Power in, Power min, Power max) const
+{
+ return std::max(min, std::min(in, max));
+}
diff --git a/src/powermap.h b/src/powermap.h
new file mode 100644
index 0000000..3a406cc
--- /dev/null
+++ b/src/powermap.h
@@ -0,0 +1,76 @@
+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ * powermap.h
+ *
+ * Fri Apr 17 23:06:12 CEST 2020
+ * Copyright 2020 André Nusser
+ * andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#pragma once
+
+#include <array>
+#include <vector>
+
+class Powermap
+{
+public:
+ using Power = float;
+ using Powers = std::vector<Power>;
+ struct PowerPair
+ {
+ Power in;
+ Power out;
+
+ bool operator!=(const PowerPair& other)
+ {
+ return in != other.in || out != other.out;
+ }
+ };
+
+ Powermap();
+
+ Power map(Power in);
+ void reset();
+
+ void setFixed0(PowerPair new_value);
+ void setFixed1(PowerPair new_value);
+ void setFixed2(PowerPair new_value);
+ void setShelf(bool enable);
+
+ PowerPair getFixed0() const;
+ PowerPair getFixed1() const;
+ PowerPair getFixed2() const;
+
+private:
+ // input parameters (state of this class)
+ std::array<PowerPair, 3> fixed;
+ bool shelf;
+
+ // spline parameters (deterministically computed from the input parameters)
+ bool spline_needs_update;
+ std::array<float, 5> m;
+ const Power eps = 1e-4;
+
+ void updateSpline();
+ std::vector<float> calcSlopes(const Powers& X, const Powers& P);
+
+ Power clamp(Power in, Power min, Power max) const;
+};
diff --git a/src/settings.h b/src/settings.h
index 9fa3896..a3d21d0 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -144,6 +144,20 @@ struct Settings
// Current latency offset in ms - for UI
Atomic<float> latency_current{0};
+ // Powermap parameters
+ Atomic<bool> enable_powermap;
+ Atomic<float> powermap_fixed0_x{0.};
+ Atomic<float> powermap_fixed0_y{0.};
+ Atomic<float> powermap_fixed1_x{.5};
+ Atomic<float> powermap_fixed1_y{.5};
+ Atomic<float> powermap_fixed2_x{1.};
+ Atomic<float> powermap_fixed2_y{1.};
+ Atomic<bool> powermap_shelf{true};
+
+ // Powermap visualizer; -1 is "none"
+ Atomic<float> powermap_input{-1.};
+ Atomic<float> powermap_output{-1.};
+
Atomic<std::size_t> audition_counter{0};
Atomic<std::string> audition_instrument;
Atomic<float> audition_velocity;
@@ -209,6 +223,18 @@ struct SettingsGetter
SettingRef<float> latency_regain;
SettingRef<float> latency_current;
+ SettingRef<bool> enable_powermap;
+ SettingRef<float> powermap_fixed0_x;
+ SettingRef<float> powermap_fixed0_y;
+ SettingRef<float> powermap_fixed1_x;
+ SettingRef<float> powermap_fixed1_y;
+ SettingRef<float> powermap_fixed2_x;
+ SettingRef<float> powermap_fixed2_y;
+ SettingRef<bool> powermap_shelf;
+
+ SettingRef<float> powermap_input;
+ SettingRef<float> powermap_output;
+
SettingRef<std::size_t> audition_counter;
SettingRef<std::string> audition_instrument;
SettingRef<float> audition_velocity;
@@ -257,6 +283,16 @@ struct SettingsGetter
, latency_stddev{settings.latency_stddev}
, latency_regain{settings.latency_regain}
, latency_current{settings.latency_current}
+ , enable_powermap{settings.enable_powermap}
+ , powermap_fixed0_x{settings.powermap_fixed0_x}
+ , powermap_fixed0_y{settings.powermap_fixed0_y}
+ , powermap_fixed1_x{settings.powermap_fixed1_x}
+ , powermap_fixed1_y{settings.powermap_fixed1_y}
+ , powermap_fixed2_x{settings.powermap_fixed2_x}
+ , powermap_fixed2_y{settings.powermap_fixed2_y}
+ , powermap_shelf{settings.powermap_shelf}
+ , powermap_input{settings.powermap_input}
+ , powermap_output{settings.powermap_output}
, audition_counter{settings.audition_counter}
, audition_instrument{settings.audition_instrument}
, audition_velocity{settings.audition_velocity}
@@ -321,6 +357,18 @@ public:
Notifier<float> latency_regain;
Notifier<float> latency_current;
+ Notifier<bool> enable_powermap;
+ Notifier<float> powermap_fixed0_x;
+ Notifier<float> powermap_fixed0_y;
+ Notifier<float> powermap_fixed1_x;
+ Notifier<float> powermap_fixed1_y;
+ Notifier<float> powermap_fixed2_x;
+ Notifier<float> powermap_fixed2_y;
+ Notifier<bool> powermap_shelf;
+
+ Notifier<float> powermap_input;
+ Notifier<float> powermap_output;
+
Notifier<std::size_t> audition_counter;
Notifier<std::string> audition_instrument;
Notifier<int> audition_velocity;
@@ -383,6 +431,18 @@ public:
EVAL(latency_regain);
EVAL(latency_current);
+ EVAL(enable_powermap);
+ EVAL(powermap_fixed0_x);
+ EVAL(powermap_fixed0_y);
+ EVAL(powermap_fixed1_x);
+ EVAL(powermap_fixed1_y);
+ EVAL(powermap_fixed2_x);
+ EVAL(powermap_fixed2_y);
+ EVAL(powermap_shelf);
+
+ EVAL(powermap_input);
+ EVAL(powermap_output);
+
EVAL(audition_counter);
EVAL(audition_instrument);
EVAL(audition_velocity);
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 19:26:32 +0000