MacOS 12.6, Playdate SDK 1.12.3
I'm having an issue where the playdate simulator crashes at seemingly random points. Here is a gif of one such crash:
I have determined that the crashing is due to calling setStencilImage. When I remove the two lines marked "-- PROBLEM!" in the code below, the program runs without crashing. I've stared at the docs and the logic of my code seems airtight. I've checked which key is being set to which stencil a million times and I swear it's always right, but sometimes a stencil is not displayed (instead displaying a solid fill) and sometimes a glitchy-looking partial stencil is displayed. Sometimes the program just crashes without any visual anomaly. When I wrote all this code, about 8 months ago, it all worked perfectly. Then I updated the Playdate SDK (I forget from which version to which), and it stopped working and has remained buggy since. Is this a Playdate problem with stenciling, or is there something about stencils I don't know? Also, any tips or resources on reading apple crash reports for Playdate development?
Here is all my code:
import "CoreLibs/object"
import "CoreLibs/graphics"
import "CoreLibs/sprites"
import "CoreLibs/timer"
local gfx <const> = playdate.graphics
local snd = playdate.sound
-- track the currently selected note
local crankChangePerNote <const> = 25
local currentNoteRaw = 48.5
local currentNote = math.floor(currentNoteRaw)
-- track which notes are active
local activeNotes = {
true,false,true,false,true, -- C,D,E
false,false,
true,false,true,false,false -- G,A
}
--`--`--`--`--`--`--`--`-- HELPER --`--`--`--`--`--`--`--`--
-- helper function: is the given note active?
function isOn(note)
local noteWithinOctave = note % 12
return activeNotes[noteWithinOctave+1]
end
-- helper function: return which octave the given note is in (each octave starts with C)
function octaveOf(note)
return math.floor(note/12)
end
--`--`--`--`--`--`--`--`-- INPUT --`--`--`--`--`--`--`--`--
-- respond to crank input
function playdate.cranked(change, acceleratedChange)
currentNoteRaw += change/crankChangePerNote
-- bound currentNoteRaw within the min and max MIDI note values
if currentNoteRaw < 0 then
currentNoteRaw = 0
elseif currentNoteRaw > 127 then
currentNoteRaw = 127
end
-- if cranking up, look for the nearest active note above; otherwise, look below
local start, finish, increment, shouldChange
if change > 0 then
start = currentNote+1
finish = currentNote+12
increment = 1
shouldChange = (currentNoteRaw > currentNote+1) -- a boolean
else
start = currentNote-1
finish = currentNote-12
increment = -1
shouldChange = (currentNoteRaw < currentNote) -- a boolean
end
if shouldChange then
for newNote = start, finish, increment do
local noteWithinOctave = newNote % 12
-- when we find the next active note...
if activeNotes[noteWithinOctave+1] then
-- set the currentNote to be the new one
currentNote = newNote
-- skip over any inactive notes, moving currentNoteRaw to currentNote,
-- but preserving its decimal part
local decimalPart = currentNoteRaw - math.floor(currentNoteRaw)
currentNoteRaw = currentNote + decimalPart
break
end
end
playNote(currentNote)
showNote(currentNote, true)
end
end
-- when the left button is pressed, move down one semitone
function playdate.leftButtonDown()
currentNote -= 1
currentNoteRaw = currentNote
-- playNote(currentNote)
showNote(currentNote, isOn(currentNote))
end
-- when the right button is pressed, move up one semitone
function playdate.rightButtonDown()
currentNote += 1
currentNoteRaw = currentNote
-- playNote(currentNote)
showNote(currentNote, isOn(currentNote))
end
-- when the A button is pressed, toggle the current note
-- display the change
function playdate.AButtonDown()
local noteWithinOctave = currentNote % 12
if activeNotes[noteWithinOctave+1] then
activeNotes[noteWithinOctave+1] = false
setMarkerForKey(keySprites[noteWithinOctave+1], "current")
else
activeNotes[noteWithinOctave+1] = true
setMarkerForKey(keySprites[noteWithinOctave+1], "currentAndOn")
playNote(currentNote)
end
end
--`--`--`--`--`--`--`--`-- SOUND --`--`--`--`--`--`--`--`--
-- set up the synth
local synth = snd.synth.new(snd.kWaveSquare)
synth:setADSR(0,0,1,0)
local synth2 = snd.synth.new(snd.kWaveSine)
synth:setADSR(0,0,1,0)
local filter = snd.twopolefilter.new(snd.kFilterLowPass)
filter:setFrequency(1000)
local lfo = snd.lfo.new(snd.kLFOSine)
lfo:setDepth(0.01)
lfo:setRate(5)
local filterEnv = snd.envelope.new(0.2,0.5,0,0.5)
filterEnv:setScale(0.5)
filterEnv:setOffset(0)
filter:setFrequencyMod(filterEnv)
-- filter:setFrequencyMod(lfo)
local chan = snd.channel.new()
chan:addSource(synth)
chan:addSource(synth2)
chan:addEffect(filter)
-- play the given note
function playNote(note)
synth:playMIDINote(note, 1, 0.8, 0)
synth2:playMIDINote(note-12, 1, 0.8, 0)
-- filterEnv:trigger(1)
end
--`--`--`--`--`--`--`--`-- GRAPHICS (ONGOING) --`--`--`--`--`--`--`--`--
-- using dithering patterns, display the given key's sprite
-- as turned on, current, or both
function setMarkerForKey(spr, marker)
if marker == "on" then
local lightDither = gfx.image.new("images/light-dither.png")
spr:setStencilImage(lightDither, true) -- PROBLEM!
elseif marker == "current" then
local darkDither = gfx.image.new("images/dark-dither.png")
spr:setStencilImage(darkDither, true) -- PROBLEM!
elseif marker == "currentAndOn" then
spr:clearStencil()
end
end
-- show the given note
function showNote(note, noteIsOn)
-- find the sprite for the given note
local noteInOctave = note % 12
local spr = keySprites[noteInOctave+1]
-- display the old note we just left properly
if(isOn(prevNote)) then
setMarkerForKey(prevSpr, "on")
else
prevSpr:remove()
end
-- display the new note appropriately
if noteIsOn then
setMarkerForKey(spr, "currentAndOn")
else
setMarkerForKey(spr, "current")
end
spr:add()
-- the new note will be the previous note next time around...
prevNote = note
prevSpr = spr
end
function playdate.update()
gfx.sprite.update()
playdate.timer.updateTimers()
end
--`--`--`--`--`--`--`--`-- GRAPHICS (ONCE) --`--`--`--`--`--`--`--`--
-- set the keyboard as the background
local backgroundImage = gfx.image.new( "images/keyboard.png" )
gfx.sprite.setBackgroundDrawingCallback(
function( x, y, width, height )
gfx.setClipRect( x, y, width, height ) -- let's only draw the part of the screen that's dirty
backgroundImage:draw( 0, 0 )
gfx.clearClipRect() -- clear so we don't interfere with drawing that comes after this
end
)
-- load images files into the key sprites, which show the user
-- which keys are active and which key is the current one
local cImage = gfx.image.new("images/C.png")
local dbImage = gfx.image.new("images/Db.png")
local dImage = gfx.image.new("images/D.png")
local ebImage = gfx.image.new("images/Eb.png")
local eImage = gfx.image.new("images/E.png")
local fImage = gfx.image.new("images/F.png")
local gbImage = gfx.image.new("images/Gb.png")
local gImage = gfx.image.new("images/G.png")
local abImage = gfx.image.new("images/Ab.png")
local aImage = gfx.image.new("images/A.png")
local bbImage = gfx.image.new("images/Bb.png")
local bImage = gfx.image.new("images/B.png")
keySprites = {
gfx.sprite.new( cImage ),
gfx.sprite.new( dbImage ),
gfx.sprite.new( dImage ),
gfx.sprite.new( ebImage ),
gfx.sprite.new( eImage ),
gfx.sprite.new( fImage ),
gfx.sprite.new( gbImage ),
gfx.sprite.new( gImage ),
gfx.sprite.new( abImage ),
gfx.sprite.new( aImage ),
gfx.sprite.new( bbImage ),
gfx.sprite.new( bImage ),
}
-- the {x,y} screen positions of the upper-left corners of the keys
local keyPositions = {
{26,47}, -- C
{50,54}, -- Db
{65,47}, -- D
{98,54}, -- Eb
{103,47}, -- E
{141,47}, -- F
{165,54}, -- Gb
{180,47}, -- G
{208,54}, -- Ab
{218,47}, -- A
{251,54}, -- Bb
{256,47}, -- B
}
-- move the keys to their positions as listed in keyPositions
-- also, display all the active keys with the "on" marker (dithering pattern)
for i = 1, 12, 1 do
local spr = keySprites[i]
local pos = keyPositions[i]
spr:setCenter(0,0)
spr:moveTo(pos[1], pos[2])
if(isOn(i-1)) then
local spr = keySprites[i]
setMarkerForKey(spr, "on")
spr:add()
end
end
-- these will track the previous note/sprite,
-- so we can reset it when we leave it
-- display the current (selected) key as such
prevNote = currentNote
prevSpr = keySprites[(prevNote % 12) + 1]
setMarkerForKey(prevSpr, "currentAndOn")
And here is the crash log for the gif above:
{"app_name":"Playdate Simulator","timestamp":"2022-11-10 15:43:39.00 -0800","app_version":"1.12.3","slice_uuid":"bd5e55f7-1461-349b-adc5-e75dff204a61","build_version":"140884","platform":1,"bundleID":"date.play.simulator","share_with_app_devs":0,"is_first_party":0,"bug_type":"309","os_version":"macOS 12.6 (21G115)","incident_id":"690183E6-102F-4A20-95C5-64C10CB72CC4","name":"Playdate Simulator"}
{
"uptime" : 93000,
"procLaunch" : "2022-11-10 15:43:32.5363 -0800",
"procRole" : "Foreground",
"version" : 2,
"userID" : 502,
"deployVersion" : 210,
"modelCode" : "MacBookPro16,1",
"procStartAbsTime" : 93023662035971,
"coalitionID" : 11777,
"osVersion" : {
"train" : "macOS 12.6",
"build" : "21G115",
"releaseType" : "User"
},
"captureTime" : "2022-11-10 15:43:38.8732 -0800",
"incident" : "690183E6-102F-4A20-95C5-64C10CB72CC4",
"bug_type" : "309",
"pid" : 22180,
"procExitAbsTime" : 93029996937660,
"cpuType" : "X86-64",
"procName" : "Playdate Simulator",
"procPath" : "\/Users\/USER\/*\/Playdate Simulator.app\/Contents\/MacOS\/Playdate Simulator",
"bundleInfo" : {"CFBundleShortVersionString":"1.12.3","CFBundleVersion":"140884","CFBundleIdentifier":"date.play.simulator"},
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"parentProc" : "launchd",
"parentPid" : 1,
"coalitionName" : "date.play.simulator",
"crashReporterKey" : "DCEDB760-EA14-5175-DB14-7F32E9431245",
"wakeTime" : 9788,
"bridgeVersion" : {"build":"19P6067","train":"6.6"},
"sleepWakeUUID" : "B7C101AB-A26F-42D8-8B13-6B70E79E0A17",
"sip" : "enabled",
"isCorpse" : 1,
"exception" : {"codes":"0x0000000000000001, 0x0000000000000000","rawCodes":[1,0],"type":"EXC_ARITHMETIC","signal":"SIGFPE"},
"termination" : {"flags":0,"code":8,"namespace":"SIGNAL","indicator":"Floating point exception: 8","byProc":"exc handler","byPid":22180},
"extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
"faultingThread" : 0,
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But there's an easy fix: you can just move the image loading out of the function to the top level so they don't scope out:
