Import SendNote example from #212, slightly adjusted

Signed-off-by: falkTX <falktx@falktx.com>

Makefile

@@ -25,6 +25,7 @@ examples: dgl
 	$(MAKE) all -C examples/Meters
 	$(MAKE) all -C examples/MidiThrough
 	$(MAKE) all -C examples/Parameters
+	$(MAKE) all -C examples/SendNote
 	$(MAKE) all -C examples/States
 ifeq ($(HAVE_CAIRO),true)
 	$(MAKE) all -C examples/CairoUI
@@ -65,6 +66,7 @@ clean:
 	$(MAKE) clean -C examples/Meters
 	$(MAKE) clean -C examples/MidiThrough
 	$(MAKE) clean -C examples/Parameters
+	$(MAKE) clean -C examples/SendNote
 	$(MAKE) clean -C examples/States
 	$(MAKE) clean -C utils/lv2-ttl-generator
 ifneq ($(MACOS_OR_WINDOWS),true)

examples/SendNote/DistrhoPluginInfo.h

@@ -0,0 +1,32 @@
+/*
+ * DISTRHO Plugin Framework (DPF)
+ * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any purpose with
+ * or without fee is hereby granted, provided that the above copyright notice and this
+ * permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+ * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef DISTRHO_PLUGIN_INFO_H_INCLUDED
+#define DISTRHO_PLUGIN_INFO_H_INCLUDED
+
+#define DISTRHO_PLUGIN_BRAND "DISTRHO"
+#define DISTRHO_PLUGIN_NAME  "SendNote"
+#define DISTRHO_PLUGIN_URI   "http://distrho.sf.net/examples/SendNote"
+
+#define DISTRHO_PLUGIN_HAS_UI           1
+#define DISTRHO_PLUGIN_HAS_EMBED_UI     1
+#define DISTRHO_PLUGIN_IS_RT_SAFE       1
+#define DISTRHO_PLUGIN_NUM_INPUTS       0
+#define DISTRHO_PLUGIN_NUM_OUTPUTS      1
+#define DISTRHO_PLUGIN_WANT_MIDI_INPUT  1
+#define DISTRHO_PLUGIN_WANT_MIDI_OUTPUT 0
+
+#endif // DISTRHO_PLUGIN_INFO_H_INCLUDED

examples/SendNote/Makefile

@@ -0,0 +1,46 @@
+#!/usr/bin/make -f
+# Makefile for DISTRHO Plugins #
+# ---------------------------- #
+# Created by falkTX
+#
+
+# --------------------------------------------------------------
+# Project name, used for binaries
+
+NAME = d_sendNote
+
+# --------------------------------------------------------------
+# Files to build
+
+FILES_DSP = \
+	SendNoteExamplePlugin.cpp
+
+
+FILES_UI  = \
+	SendNoteExampleUI.cpp
+
+# --------------------------------------------------------------
+# Do some magic
+
+include ../../Makefile.plugins.mk
+
+# --------------------------------------------------------------
+# Enable all possible plugin types
+
+ifeq ($(HAVE_JACK),true)
+ifeq ($(HAVE_OPENGL),true)
+TARGETS += jack
+endif
+endif
+
+ifeq ($(HAVE_OPENGL),true)
+TARGETS += lv2_sep
+else
+TARGETS += lv2_dsp
+endif
+
+TARGETS += vst
+
+all: $(TARGETS)
+
+# --------------------------------------------------------------

examples/SendNote/README.md

@@ -0,0 +1,6 @@
+# SendNote example
+
+This example will show how to send MIDI notes in DPF based UIs.<br/>
+
+The UI presents a row of MIDI keys which transmit note events to a synthesizer.
+

examples/SendNote/SendNoteExamplePlugin.cpp

@@ -0,0 +1,192 @@
+/*
+ * DISTRHO Plugin Framework (DPF)
+ * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any purpose with
+ * or without fee is hereby granted, provided that the above copyright notice and this
+ * permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+ * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "DistrhoPlugin.hpp"
+
+#include <cmath>
+#include <cstring>
+
+START_NAMESPACE_DISTRHO
+
+// -----------------------------------------------------------------------------------------------------------
+
+/**
+  Plugin that demonstrates sending notes from the editor in DPF.
+ */
+class SendNoteExamplePlugin : public Plugin
+{
+public:
+    SendNoteExamplePlugin()
+        : Plugin(0, 0, 0)
+    {
+        std::memset(fNotesPlayed, 0, sizeof(fNotesPlayed));
+        std::memset(fOscillatorPhases, 0, sizeof(fOscillatorPhases));
+    }
+
+protected:
+   /* --------------------------------------------------------------------------------------------------------
+    * Information */
+
+   /**
+      Get the plugin label.
+      This label is a short restricted name consisting of only _, a-z, A-Z and 0-9 characters.
+    */
+    const char* getLabel() const override
+    {
+        return "SendNote";
+    }
+
+   /**
+      Get an extensive comment/description about the plugin.
+    */
+    const char* getDescription() const override
+    {
+        return "Plugin that demonstrates sending notes from the editor in DPF.";
+    }
+
+   /**
+      Get the plugin author/maker.
+    */
+    const char* getMaker() const override
+    {
+        return "DISTRHO";
+    }
+
+   /**
+      Get the plugin homepage.
+    */
+    const char* getHomePage() const override
+    {
+        return "https://github.com/DISTRHO/DPF";
+    }
+
+   /**
+      Get the plugin license name (a single line of text).
+      For commercial plugins this should return some short copyright information.
+    */
+    const char* getLicense() const override
+    {
+        return "ISC";
+    }
+
+   /**
+      Get the plugin version, in hexadecimal.
+    */
+    uint32_t getVersion() const override
+    {
+        return d_version(1, 0, 0);
+    }
+
+   /**
+      Get the plugin unique Id.
+      This value is used by LADSPA, DSSI and VST plugin formats.
+    */
+    int64_t getUniqueId() const override
+    {
+        return d_cconst('d', 'S', 'N', 'o');
+    }
+
+   /* --------------------------------------------------------------------------------------------------------
+    * Init and Internal data, unused in this plugin */
+
+    void  initParameter(uint32_t, Parameter&) override {}
+    float getParameterValue(uint32_t) const   override { return 0.0f;}
+    void  setParameterValue(uint32_t, float)  override {}
+
+   /* --------------------------------------------------------------------------------------------------------
+    * Audio/MIDI Processing */
+
+   /**
+      Run/process function for plugins with MIDI input.
+      This synthesizes the MIDI voices with a sum of sine waves.
+    */
+    void run(const float**, float** outputs, uint32_t frames,
+             const MidiEvent* midiEvents, uint32_t midiEventCount) override
+    {
+        for (uint32_t i = 0; i < midiEventCount; ++i)
+        {
+            if (midiEvents[i].size <= 3)
+            {
+                uint8_t status = midiEvents[i].data[0];
+                uint8_t note = midiEvents[i].data[1] & 127;
+                uint8_t velocity = midiEvents[i].data[2] & 127;
+
+                switch (status & 0xf0)
+                {
+                case 0x90:
+                    if (velocity != 0)
+                    {
+                        fNotesPlayed[note] = velocity;
+                        break;
+                    }
+                    /* fall through */
+                case 0x80:
+                    fNotesPlayed[note] = 0;
+                    fOscillatorPhases[note] = 0;
+                    break;
+                }
+            }
+        }
+
+        float* const output = outputs[0];
+        std::memset(output, 0, frames * sizeof(float));
+
+        for (uint32_t noteNumber = 0; noteNumber < 128; ++noteNumber)
+        {
+            if (fNotesPlayed[noteNumber] == 0)
+                continue;
+
+            float notePitch = 8.17579891564 * std::exp(0.0577622650 * noteNumber);
+
+            float phase = fOscillatorPhases[noteNumber];
+            float timeStep = notePitch / getSampleRate();
+            float k2pi = 2.0 * M_PI;
+            float gain = 0.1;
+
+            for (uint32_t i = 0; i < frames; ++i)
+            {
+                output[i] += gain * std::sin(k2pi * phase);
+                phase += timeStep;
+                phase -= (int)phase;
+            }
+
+            fOscillatorPhases[noteNumber] = phase;
+        }
+    }
+
+    // -------------------------------------------------------------------------------------------------------
+
+private:
+    uint8_t fNotesPlayed[128];
+    float fOscillatorPhases[128];
+
+   /**
+      Set our plugin class as non-copyable and add a leak detector just in case.
+    */
+    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SendNoteExamplePlugin)
+};
+
+/* ------------------------------------------------------------------------------------------------------------
+ * Plugin entry point, called by DPF to create a new plugin instance. */
+
+Plugin* createPlugin()
+{
+    return new SendNoteExamplePlugin();
+}
+
+// -----------------------------------------------------------------------------------------------------------
+
+END_NAMESPACE_DISTRHO

examples/SendNote/SendNoteExampleUI.cpp

@@ -0,0 +1,172 @@
+/*
+ * DISTRHO Plugin Framework (DPF)
+ * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any purpose with
+ * or without fee is hereby granted, provided that the above copyright notice and this
+ * permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+ * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "DistrhoUI.hpp"
+
+#include "Color.hpp"
+
+#include <cstring>
+
+START_NAMESPACE_DISTRHO
+
+/**
+  We need the rectangle class from DGL.
+ */
+using DGL_NAMESPACE::Rectangle;
+
+// -----------------------------------------------------------------------------------------------------------
+
+class SendNoteExampleUI : public UI
+{
+public:
+    SendNoteExampleUI()
+        : UI(64*12+8, 64+8),
+          fLastKey(-1)
+    {
+        std::memset(fKeyState, 0, sizeof(fKeyState));
+    }
+
+protected:
+   /* --------------------------------------------------------------------------------------------------------
+    * DSP/Plugin Callbacks */
+
+   /**
+      A parameter has changed on the plugin side.
+      This is called by the host to inform the UI about parameter changes.
+    */
+    void parameterChanged(uint32_t index, float value) override
+    {
+        (void)index;
+        (void)value;
+    }
+
+   /* --------------------------------------------------------------------------------------------------------
+    * Widget Callbacks */
+
+   /**
+      The OpenGL drawing function.
+      This UI will draw a row of 12 keys, with on/off states according to pressed status.
+    */
+    void onDisplay() override
+    {
+        const GraphicsContext& context(getGraphicsContext());
+
+        for (int key = 0; key < 12; ++key)
+        {
+            bool pressed = fKeyState[key];
+            Rectangle<int> bounds = getKeyBounds(key);
+
+            if (pressed)
+                Color(0.8f, 0.5f, 0.3f).setFor(context);
+            else
+                Color(0.3f, 0.5f, 0.8f).setFor(context);
+
+            bounds.draw(context);
+        }
+    }
+
+   /**
+      Mouse press event.
+      This UI will de/activate keys when you click them and reports it as MIDI note events to the plugin.
+    */
+    bool onMouse(const MouseEvent& ev) override
+    {
+        // Test for last key release first
+        if (fLastKey != -1 && ! ev.press)
+        {
+            // Send a note event. Velocity=0 means off
+            sendNote(0, kNoteOctaveStart+fLastKey, 0);
+            // Unset key state
+            fKeyState[fLastKey] = false;
+            fLastKey = -1;
+            repaint();
+            return true;
+        }
+
+        // Test for left-clicked first.
+        if (ev.button != 1)
+            return false;
+
+        // Find the key which is pressed, if any
+        int whichKey = -1;
+        for (int key = 0; key < 12 && whichKey == -1; ++key)
+        {
+            Rectangle<int> bounds = getKeyBounds(key);
+
+            if (bounds.contains(ev.pos))
+                whichKey = key;
+        }
+
+        if (whichKey == -1)
+            return false;
+        if (fKeyState[whichKey] == ev.press)
+            return false;
+
+        // Send a note event. Velocity=0 means off
+        sendNote(0, kNoteOctaveStart+whichKey, ev.press ? kNoteVelocity : 0);
+
+        // Set pressed state of this key, and update display
+        fLastKey = whichKey;
+        fKeyState[whichKey] = ev.press;
+        repaint();
+
+        return true;
+    }
+
+   /**
+      Set our UI class as non-copyable and add a leak detector just in case.
+    */
+    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SendNoteExampleUI)
+
+private:
+    /**
+       Get the bounds of a particular key of the virtual MIDI keyboard.
+     */
+    Rectangle<int> getKeyBounds(unsigned index) const
+    {
+        Rectangle<int> bounds;
+        int padding = 8;
+        bounds.setX(64 * index + padding);
+        bounds.setY(padding);
+        bounds.setWidth(64 - padding);
+        bounds.setHeight(64 - padding);
+        return bounds;
+    }
+
+    /**
+       The pressed state of one octave of a virtual MIDI keyboard.
+     */
+    bool fKeyState[12];
+    int8_t fLastKey;
+
+    enum
+    {
+        kNoteVelocity = 100, // velocity of sent Note-On events
+        kNoteOctaveStart = 60, // starting note of the virtual MIDI keyboard
+    };
+};
+
+/* ------------------------------------------------------------------------------------------------------------
+ * UI entry point, called by DPF to create a new UI instance. */
+
+UI* createUI()
+{
+    return new SendNoteExampleUI();
+}
+
+// -----------------------------------------------------------------------------------------------------------
+
+END_NAMESPACE_DISTRHO