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use midir::MidiOutputConnection;
use super::Button;
use crate::OutputDevice;
pub use crate::protocols::double_buffering::*;
pub use crate::protocols::query::*;
#[allow(dead_code)] // to prevent "variant is never constructed" warning
enum GridMappingMode {
Session,
DrumRack,
}
/// The Launchpad Mini output connection handler.
pub struct Output {
connection: MidiOutputConnection,
}
impl crate::OutputDevice for Output {
const MIDI_CONNECTION_NAME: &'static str = "Launchy Mini output";
const MIDI_DEVICE_KEYWORD: &'static str = "Launchpad Mini";
fn from_connection(connection: MidiOutputConnection) -> Result<Self, crate::MidiError> {
let mut self_ = Self { connection };
self_.change_grid_mapping_mode(GridMappingMode::Session)?;
Ok(self_)
}
fn send(&mut self, bytes: &[u8]) -> Result<(), crate::MidiError> {
self.connection.send(bytes)?;
Ok(())
}
}
impl Output {
/// Set a `button` to a certain `color`.
///
/// For example to set the leftmost control button to yellow:
/// ```no_run
/// # use launchy::mini::{Output, Button, Color, DoubleBufferingBehavior};
/// # use launchy::OutputDevice as _;
/// # let output: launchy::mini::Output = unimplemented!();
///
/// let button = Button::ControlButton { index: 0 };
/// let color = Color::YELLOW;
/// output.set_button(button, color, DoubleBufferingBehavior::Copy)?;
/// # Ok::<(), launchy::MidiError>(())
/// ```
pub fn set_button(
&mut self,
button: Button,
color: Color,
d: DoubleBufferingBehavior,
) -> Result<(), crate::MidiError> {
let light_code = make_color_code(color, d);
match button {
Button::GridButton { x, y } => {
let button_code = y * 16 + x;
self.send(&[0x90, button_code, light_code])?;
}
Button::ControlButton { index } => {
let button_code = 104 + index;
self.send(&[0xB0, button_code, light_code])?;
}
}
Ok(())
}
/// In order to make maximum use of the original Launchpad's slow midi speeds, a rapid LED
/// lighting mode was invented which allows the lighting of two leds in just a single message.
/// To use this mode, simply start sending these message and the Launchpad will update the 8x8
/// grid in left-to-right, top-to-bottom order, then the eight scene launch buttons in
/// top-to-bottom order, and finally the eight Automap/Live buttons in left-to-right order
/// (these are otherwise inaccessible using note-on messages). Overflowing data will be ignored.
///
/// To leave the mode, simply send any other message. Sending another kind of message and then
/// re-sending this message will reset the cursor to the top left of the grid.
pub fn set_button_rapid(
&mut self,
color1: Color,
dbb1: DoubleBufferingBehavior,
color2: Color,
dbb2: DoubleBufferingBehavior,
) -> Result<(), crate::MidiError> {
self.send(&[
0x92,
make_color_code(color1, dbb1),
make_color_code(color2, dbb2),
])
}
/// Turns on all LEDs to a certain brightness, dictated by the `brightness` parameter. According
/// to the Launchpad documentation, sending this command resets various configuration settings -
/// see `reset()` for more information. However, in my experience, that only sometimes happens.
/// Weird.
///
/// This function is primarily intended as a diagnostics tool to verify that the library and the
/// device is working correctly.
pub fn turn_on_all_leds(&mut self, brightness: Brightness) -> Result<(), crate::MidiError> {
let brightness_code = match brightness {
Brightness::Off => 0,
Brightness::Low => 125,
Brightness::Medium => 126,
Brightness::Full => 127,
};
self.send(&[0xB0, 0, brightness_code])
}
/// Launchpad controls the brightness of its LEDs by continually switching them on and off
/// faster than the eye can see: a technique known as multiplexing. This command provides a way
/// of altering the proportion of time for which the LEDs are on while they are in low- and
/// medium-brightness modes. This proportion is known as the duty cycle.
///
/// Manipulating this is useful for fade effects, for adjusting contrast, and for creating
/// custom palettes.
///
/// The default duty cycle is 1/5 meaning that low-brightness LEDs are on for only every fifth
/// multiplex pass, and medium-brightness LEDs are on for two passes in every five. Generally,
/// lower duty cycles (numbers closer to zero) will increase contrast between different
/// brightness settings but will also increase flicker; higher ones will eliminate flicker, but
/// will also reduce contrast. Note that using less simple ratios (such as 3/17 or 2/11) can
/// also increase perceived flicker.
///
/// If you are particularly sensitive to strobing lights, please use this command with care when
/// working with large areas of low-brightness LEDs: in particular, avoid duty cycles of 1/8 or
/// less.
pub fn set_duty_cycle(
&mut self,
numerator: u8,
denominator: u8,
) -> Result<(), crate::MidiError> {
assert!(numerator >= 1);
assert!(numerator <= 16);
assert!(denominator >= 3);
assert!(denominator <= 18);
if numerator < 9 {
self.send(&[0xB0, 30, 16 * (numerator - 1) + (denominator - 3)])
} else {
self.send(&[0xB0, 31, 16 * (numerator - 9) + (denominator - 3)])
}
}
/// This method controls the double buffering mode on the Launchpad. See the module
/// documentation for an explanation on double buffering.
///
/// The default state is no flashing; the first buffer is both the update and the displayed
/// buffer: In this mode, any LED data written to Launchpad is displayed instantly. Sending this
/// message also resets the flash timer, so it can be used to resynchronise the flash rates of
/// all the Launchpads connected to a system.
///
/// - If `copy` is set, copy the LED states from the new displayed buffer to the new updating
/// buffer.
/// - If `flash` is set, continually flip displayed buffers to make selected LEDs flash.
/// - `updated`: the new updated buffer
/// - `displayed`: the new displayed buffer
pub fn control_double_buffering(&mut self, d: DoubleBuffering) -> Result<(), crate::MidiError> {
let last_byte = 0b00100000
| ((d.copy as u8) << 4)
| ((d.flash as u8) << 3)
| ((d.edited_buffer as u8) << 2)
| d.displayed_buffer as u8;
self.send(&[0xB0, 0, last_byte])
}
pub fn scroll_text(
&mut self,
text: &[u8],
color: Color,
should_loop: bool,
) -> Result<(), crate::MidiError> {
let color_code = make_color_code_loopable(color, should_loop);
let bytes = &[&[240, 0, 32, 41, 9, color_code], text, &[247]].concat();
self.send(bytes)
}
pub fn request_device_inquiry(&mut self, query: DeviceIdQuery) -> Result<(), crate::MidiError> {
request_device_inquiry(self, query)
}
pub fn request_version_inquiry(&mut self) -> Result<(), crate::MidiError> {
request_version_inquiry(self)
}
fn change_grid_mapping_mode(&mut self, mode: GridMappingMode) -> Result<(), crate::MidiError> {
let mode = match mode {
GridMappingMode::Session => 0,
GridMappingMode::DrumRack => 1,
};
self.send(&[240, 0, 32, 41, 2, 24, 34, mode, 247])
}
// -----------------------------
// Shorthand functions:
// -----------------------------
/// All LEDs are turned off, and the mapping mode, buffer settings, and duty cycle are reset to
/// their default values.
pub fn reset(&mut self) -> Result<(), crate::MidiError> {
self.turn_on_all_leds(Brightness::Off)
}
pub fn set_all_buttons(
&mut self,
color: Color,
dbb: DoubleBufferingBehavior,
) -> Result<(), crate::MidiError> {
for _ in 0..40 {
self.set_button_rapid(color, dbb, color, dbb)?;
}
Ok(())
}
pub fn light(&mut self, button: Button, color: Color) -> Result<(), crate::MidiError> {
self.set_button(button, color, DoubleBufferingBehavior::Copy)
}
pub fn light_all(&mut self, color: Color) -> Result<(), crate::MidiError> {
self.set_all_buttons(color, DoubleBufferingBehavior::Copy)
}
}