rtmidi/Launchpad.cpp

#include "Launchpad.h"
#include "MidiMessage.h"

Launchpad::Launchpad()
	: midiin(), midiout(), keyPressedCallback(0), keyReleasedCallback(0)
{
	midiin.setCallback(midiMessageCallback, (void*) this);

	midiout.openPort(1);
	midiin.openPort(0);
}

void Launchpad::midiMessageCallback(double timeStamp, MidiMessage &message, void *userData)
{
	Launchpad *launchpad = (Launchpad*) userData;

	// use runtime type information to check for the message type.
	// this requires the specified class to have a virtual member.
	NoteMessage *noteMessage = dynamic_cast<NoteMessage*>(&message);
	if(noteMessage)
	{
		unsigned char x = noteMessage->pitch % 16;
		unsigned char y = 7 - noteMessage->pitch / 16;

		if(dynamic_cast<NoteOnMessage*>(noteMessage))
		{
			launchpad->keyPressed(x, y);
		}
		else
		{
			launchpad->keyReleased(x, y);
		}
	}
	else
	{
		ControlChangeMessage *controlChangeMessage = dynamic_cast<ControlChangeMessage*>(&message);
		if(controlChangeMessage)
		{
			unsigned char x = controlChangeMessage->control - 104;
			unsigned char y = 8;

			if(controlChangeMessage->value == 127)
			{
				launchpad->keyPressed(x, y);
			}
			else
			{
				launchpad->keyReleased(x, y);
			}
		}
	}
}

void Launchpad::setColor(unsigned char x, unsigned char y, unsigned char red, unsigned char green)
{
	unsigned char velocity = (green << 4) + red;

	if(y == 8)
	{
		midiout.sendMessage(ControlChangeMessage(
			0, 
			104 + x,
			velocity
			));
	}
	else
	{
		midiout.sendMessage(NoteOnMessage(
			0, 
			((7 - y) << 4) + x,
			velocity
			));
	}
}

void Launchpad::keyPressed(unsigned char x, unsigned char y)
{
	if(keyPressedCallback)
	{
		keyPressedCallback(x, y);
	}
}

void Launchpad::keyReleased(unsigned char x, unsigned char y)
{
	if(keyReleasedCallback)
	{
		keyReleasedCallback(x, y);
	}
}