rtmidi/Launchpad.cpp

#include "Launchpad.h"
#include <string>

namespace midi {

Launchpad::Launchpad()
	: midiin(), midiout(), keyPressedCallback(0), keyReleasedCallback(0)
{
    // define callback before opening port to keep the message queue empty.
	midiin.setCallback(midiMessageCallback, (void*) this);

    for(unsigned int i=0; i<midiout.getPortCount(); i++)
    {
        if(midiout.getPortName(i).find("Launchpad") != std::string::npos)
        {
	        midiout.openPort(i);
            break;
        }
    }
    if(!midiout.isPortOpen())
	{
		throw "no launchpad for midi output found";
	}

    for(unsigned int i=0; i<midiin.getPortCount(); i++)
    {
        if(midiin.getPortName(i).find("Launchpad") != std::string::npos)
        {
	        midiin.openPort(i);
            break;
        }
    }
    if(!midiin.isPortOpen())
	{
		throw "no launchpad for midi input found";
	}
}

void Launchpad::midiMessageCallback(double timeStamp, Message &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);
			}
		}
	}
}
bool Launchpad::issetColor(unsigned char x, unsigned char y) const
{
	return colorSet[x][y];
}

const LaunchpadColor& Launchpad::getColor(unsigned char x, unsigned char y) const
{
	return colors[x][y];
}

void Launchpad::setColor(unsigned char x, unsigned char y, const LaunchpadColor& color)
{
	if(x >= width || y >= height || (x == 8 && y == 8))
	{
		throw "specified launchpad position is out of range";
	}
	if(color.red > 3 || color.green > 3)
	{
		throw "specified launchpad color is out of range";
	}

	unsigned char velocity = (color.green << 4) + color.red;

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

	colors[x][y] = color;
	colorSet[x][y] = true;
}

void Launchpad::setColorAll(const LaunchpadColor& color)
{
	for(unsigned char x = 0; x < width; x++)
	{
		for(unsigned char y = 0; y < height; y++)
		{
			if(x != 8 || y != 8)
			{
				setColor(x, y, color);
			}
		}
	}
}

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

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

} // namespace