Add sustained choir instrument

patches/sustain-choir/sustain-choir.lua

@@ -0,0 +1,132 @@
+local patch = {}
+local l = require("lume")
+local efx = require('efx')
+local sampler = require('sampler')
+local hexpad = require('hexpad')
+local hexgrid = require('hexgrid')
+
+local colorScheme = {
+  wood    = {l.color('#8c3c00')},
+  neck    = {l.color('#302400')},
+  strings = {
+    {l.color('#a69b87')},
+    {l.color('#988c75')},
+    {l.color('#847965')},
+  },
+  hair    = {l.color('#a39782')},
+  stick   = {l.color('#5e2400')},
+
+  background = {l.rgba(0x262626ff)},
+  highlight  = {l.hsl(0.66, 0.20, 0.23)},
+  surface    = {l.rgba(0x444444ff)},
+  surfaceC   = {l.rgba(0x353535ff)},
+  bright     = {l.rgba(0x75ade699)},
+}
+
+function patch.load()
+  patch.keyboard = hexpad.new(true)
+
+  patch.tone = sampler.new({
+    {path='patches/choir/choir_21.ogg',  note= -9},
+    {path='patches/choir/choir_15.ogg',  note= -3},
+    {path='patches/choir/choir_12.ogg',  note=  0},
+    {path='patches/choir/choir_9.ogg',   note=  3},
+    {path='patches/choir/choir_6.ogg',   note=  6},
+    {path='patches/choir/choir_3.ogg',   note=  9},
+    {path='patches/choir/choir_0.ogg',   note= 12},
+    {path='patches/choir/choir_-3.ogg',  note= 15},
+    {path='patches/choir/choir_-6.ogg',  note= 18},
+    looped = true,
+    envelope = { attack = 0.05, decay = 0.40, sustain = 0.85, release = 0.35 },
+    synthCount = 12,
+  })
+  patch.keyboard.colorScheme.background = colorScheme.background
+  patch.keyboard.colorScheme.highlight  = colorScheme.highlight
+  patch.keyboard.colorScheme.surface    = colorScheme.surface
+  patch.keyboard.colorScheme.surfaceC   = colorScheme.surfaceC
+  patch.keyboard.colorScheme.bright     = colorScheme.bright
+  love.graphics.setBackgroundColor(colorScheme.background)
+end
+
+local pressing = false
+local sustained = {}
+local previous = {}
+local sustainedCount = 0
+function sustain(s)
+  if next(s.touches) then
+    -- erase previous sustains on next touch
+    if not pressing then
+      previous = sustained
+      sustained = {}
+      sustainedCount = 0
+    end
+    pressing = true
+    -- remember touched notes
+    for _,touch in pairs(s.touches) do
+      if touch.note and not sustained[touch.note] then
+        sustained[touch.note] = touch
+        sustainedCount = sustainedCount + 1
+      end
+    end
+  else
+    -- if sustained note is re-pressed, stop playing
+    if pressing and sustainedCount == 1 then
+      local note, touch = next(sustained)
+      if previous[note] then
+        sustained = {}
+        previous = {}
+        sustainedCount = 0
+      end
+    end
+    -- simulate sustained notes
+    local i = 1000
+    for note, data in pairs(sustained) do
+      s.touches[i] = data
+      s.touches[i].noteRetrigger = pressing -- this will be true on first pass after touch release
+      i = i + 1
+    end
+    pressing = false
+  end
+end
+
+function patch.process(s)
+  patch.keyboard:interpret(s)
+  sustain(s)
+  -- slower attack & release when tilted forward
+  patch.tone.envelope.attack    = l.remap(s.tilt.lp[2],  .00, -.2, .2, 2, 'clamp')
+  patch.tone.envelope.release   = l.remap(s.tilt.lp[2], -.05, -.4, .6, 4, 'clamp')
+  efx.reverb.decaytime           = l.remap(s.tilt.lp[2],  .00, -.4, 1,  8, 'clamp')
+  -- volume control
+  patch.tone.masterVolume   = l.remap(s.tilt.lp[1], -0.1, 0.6, 1, .05, 'clamp')
+  patch.tone:processTouches(s.dt, s.touches)
+  return s
+end
+
+function patch.draw(s)
+  patch.keyboard:draw(s)
+end
+
+function patch.icon(time)
+  -- TODO: meaningful icon
+  love.graphics.setColor(colorScheme.background)
+  love.graphics.rectangle('fill', -1, -1, 2, 2)
+  local i = 0
+  love.graphics.rotate(time/5 + 0.2*math.sin(time))
+  for q, r in hexgrid.spiralIter(0, 0, 1) do
+    if i % 2 == 0 then
+      love.graphics.setColor(colorScheme.highlight)
+    else
+      love.graphics.setColor(colorScheme.surface)
+    end
+    love.graphics.push()
+    local x, y = hexgrid.hexToPixel(q, r)
+      love.graphics.scale(0.25)
+      local x, y = hexgrid.hexToPixel(q, r)
+      love.graphics.translate(x,y)
+      love.graphics.circle('fill', x, y, 1.6)
+    love.graphics.pop()
+    i = i + 1
+  end
+end
+
+return patch