Moving more playdate files around, adding a playdate-specific gitignore to the subdirectory and adding an easter egg.

playdate/matrix_lua/Source/main.lua

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+local gfx <const> = playdate.graphics
+local floor <const> = math.floor
+local random <const> = math.random
+
+local screenWidth <const> = playdate.display.getWidth()
+local screenHeight <const> = playdate.display.getHeight()
+local glyphWidth <const> = 20
+local numColumns <const> = floor(screenWidth / glyphWidth)
+local numRows <const> = floor(screenHeight / glyphWidth)
+local numCells <const> = numColumns * numRows
+
+local numStandardGlyphs <const> = 133
+local numPDGlyphs <const> = 10
+local numTotalGlyphs <const> = numStandardGlyphs + numPDGlyphs
+local numFades <const> = 32
+local glyphs = {}
+
+do
+	local glyphSpritesheet = gfx.image.new('images/matrix-glyphs')
+	local spritesheetColumns = floor(glyphSpritesheet.width / glyphWidth)
+	local fadeGradient = gfx.image.new('images/fade-gradient')
+	local glyph = gfx.image.new(glyphWidth, glyphWidth, gfx.kColorBlack)
+
+	gfx.pushContext(glyph)
+	for i = 1, numTotalGlyphs do
+		local column = (i - 1) % spritesheetColumns
+		local row = floor((i - 1) / spritesheetColumns)
+		glyphSpritesheet:draw(-column * glyphWidth, -row * glyphWidth)
+		glyphs[i] = {}
+		for j = 1, numFades do
+			local fade = (j - 1) / (numFades - 1)
+			local variant = glyph:copy()
+			glyphs[i][j] = variant
+			gfx.pushContext(variant)
+			gfx.setImageDrawMode(gfx.kDrawModeWhiteTransparent);
+			fadeGradient:draw(fade * (glyphWidth - fadeGradient.width), 0)
+			gfx.popContext()
+		end
+	end
+	gfx.popContext()
+end
+
+local minSpeed <const> = 0.15
+local maxSpeed <const> = 1
+local time = 0
+local speed = maxSpeed
+
+local sineTable = {}
+for i = 1,360 do
+	sineTable[i] = math.sin(math.pi / 180 * i)
+end
+
+local wobbleA <const> = math.sqrt(2) / 50
+local wobbleB <const> = math.sqrt(5) / 50
+
+local cells = {}
+for x = 1, numColumns do
+	local columnTimeOffset = random() * 1000
+	local columnSpeedOffset = random() * 0.5 + 0.5
+	for y = 1, numRows do
+		local cell = {}
+		cell.x = x
+		cell.y = y
+		cell.glyphCycle = random()
+		cell.columnTimeOffset = columnTimeOffset
+		cell.columnSpeedOffset = columnSpeedOffset
+		cell.glyphIndex = random(numStandardGlyphs)
+		cell.fadeIndex = -1
+
+		cells[#cells + 1] = cell
+	end
+end
+
+playdate.display.setRefreshRate(30)
+playdate.resetElapsedTime()
+
+function playdate.update()
+	local delta
+	if playdate.isCrankDocked() then
+		speed = math.min(maxSpeed, speed + 0.07)
+		delta = playdate.getElapsedTime() * speed
+	else
+		speed = math.max(minSpeed, speed - 0.07)
+		delta = playdate.getElapsedTime() * speed + playdate.getCrankChange() * 2 / 360 -- TODO: tune
+	end
+	playdate.resetElapsedTime()
+	time += delta
+
+	local addPDGlyphs = playdate.buttonIsPressed(playdate.kButtonA) and playdate.buttonIsPressed(playdate.kButtonB)
+
+	for i = 1, numCells do
+		local mustDraw = false
+		local cell = cells[i]
+
+		local cellTime = cell.y * -0.03 + cell.columnTimeOffset + time * cell.columnSpeedOffset
+		local brightness = 4 * (
+			(
+				cellTime
+				+ 0.3 * sineTable[floor((wobbleA * cellTime) % 360) + 1]
+				+ 0.2 * sineTable[floor((wobbleB * cellTime) % 360) + 1]
+			) % 1
+		)
+		local fadeIndex = floor(brightness * numFades)
+		if fadeIndex < 1 then fadeIndex = 1 end
+		if fadeIndex > numFades then fadeIndex = numFades end
+		if cell.fadeIndex ~= fadeIndex then
+			cell.fadeIndex = fadeIndex
+			mustDraw = true
+		end
+
+		cell.glyphCycle = cell.glyphCycle + delta * 2
+		if cell.glyphCycle > 1 then
+			cell.glyphCycle = cell.glyphCycle % 1
+			local lastGlyphIndex = cell.glyphIndex
+			while cell.glyphIndex == lastGlyphIndex do
+				if addPDGlyphs and random(4) == 1 then
+					cell.glyphIndex = random(numPDGlyphs) + numStandardGlyphs
+				else
+					cell.glyphIndex = random(numStandardGlyphs)
+				end
+			end
+			if fadeIndex < numFades then
+				mustDraw = true
+			end
+		end
+
+		if mustDraw then
+			glyphs[cell.glyphIndex][cell.fadeIndex]:draw((cell.x - 1) * glyphWidth, (cell.y - 1) * glyphWidth)
+		end
+	end
+end

playdate/matrix_lua/Source/pdxinfo

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+name=The Playtrix (Lua build)
+author=Rezmason
+description=A familiar animation of mysterious raining symbols.
+bundleID=net.rezmason.theplaytrix_lua
+version=1.0
+buildNumber=1
+imagePath=path/to/launcher/assets
+launchSoundPath=path/to/launch/sound/file