Changelog

Version 0.3

June 23 2026

Playbit.app

• Made installing new toolchain and examples more robust
• Fixed text selection being incorrect after clearing the log

Web Runtime

• Introduced playbit.js technology preview
  • Intended to allow running unmodified apps with the Playbit runtime running on the web
  • Visit https://playbit.app/ for a demo

C API

• Added new UI library UI3
  • See new playbit/ui3.h
• Added new multiplayer sync-ed data library
  • See new playbit/multiplayer.h
• Added APIs for interacting with Human-Interface Devices (HID) such as gamepads
  • See PBGamepadAxis and PBGamepadEvent in playbit/event.h
  • See new playbit/hid.h
• Added PBNetChannelDirect to playbit/net.h
• Added generic TCP/UDP networking PBNetTransport
  • See new PBNetTransportOpen in playbit/net.h
  • See new PBNetTransportOpenStream in playbit/net.h
  • See new PBNetTransportOpenEx in playbit/net.h
  • See new PBNetTransportOpenStreamEx in playbit/net.h
  • See new PBNetTransportSetKeepAlive in playbit/net.h
• Improved the correctness of PBArenaPush
• Added PBDrawTextAlign to playbit/draw.h
• Added PBDrawSetBackgroundColor to playbit/draw.h
• Added various functions for querying a window's mouse and keyboard state
  • See new PBWindowGetMousePosition in playbit/window.h
  • See new PBKeyPressed in playbit/window.h
  • See new PBKeyReleased in playbit/window.h
  • See new PBKeyRepeated in playbit/window.h
  • See new PBKeyRepeated in playbit/window.h
  • See new PBMousePressed in playbit/window.h
  • See new PBMouseReleased in playbit/window.h
  • See new PBMouseDown in playbit/window.h
  • See new PBWindowProcessEvents in playbit/window.h
  • See new PBWindowEndFrame in playbit/window.h
• Added PBPanicv to playbit/base.h
• Fixed compilation error with PBBufSlice
• Added various PBStr index finding functions
  • See new PBStrIndexOfStr in playbit/string.h
  • See new PBStrLastIndexOfStr in playbit/string.h
  • See new PBStrIndexOfByte in playbit/string.h
  • See new PBStrLastIndexOfByte in playbit/string.h
• Added various PBStr numeric parsing functions
  • See new PBStrSliceParseInt in playbit/string.h
  • See new PBStrSliceParseUInt in playbit/string.h
  • See new PBIntOfStr in playbit/string.h
• Added various PBStr trimming functions
  • See new PBStrSliceTrim in playbit/string.h
  • See new PBStrSliceTrimStart in playbit/string.h
  • See new PBStrSliceTrimEnd in playbit/string.h
• Added various PBMemFind functions
  • See new PBMemFindByte in playbit/mem.h
  • See new PBMemFindLastByte in playbit/mem.h
  • See new PBMemFindSegment in playbit/mem.h
  • See new PBMemFindLastSegment in playbit/mem.h
• Fixed compilation error with PBCheckStrEq
• Fixed potential compilation error with PB_UNREACHABLE
• Improved the correctness of PBWindowGetMousePosition
• Improved potential link error with some math functions in playbit/math.h
• Improved logging behavior to be defined as always logging one full complete message at a time
• Renamed PB_GUI_ENABLED define to PB_NO_GUI with approriate behavior change

Runtime

• Improved rendering latency and frame pacing
• Fixed an issue where popping the root render clip region did not clear clipping
• Fixed an issue where SysWindowFrameSyncEnable would not enforce rights control
• Fixed an issue where the frame sync signal could continue to fire even after the guest does not want it
• Fixed an issue where the runtime event loop could get confused and idle forever
• Fixed an issue where unreasonable window sizes could cause a crash
• Improved window resize signal to not fire when macOS reported a resize but the window was the same size
• Added PBTextPlanLayoutFlags enum to specify already supported text layout flags
• Added PBSysWindowSetCursor and various associated types
• Added various syscalls for handling window fullscreen state
  • See new PBSysWindowFullScreenGet in playbit/sys/syscalls/window.h
  • See new PBSysWindowFullScreenSet in playbit/sys/syscalls/window.h
• Added various syscalls and associated types for handling GUI presentation
  • See new PBSysGuiPresentationGet in playbit/sys/syscalls/gui.h
  • See new PBSysGuiPresentationSet in playbit/sys/syscalls/gui.h
• Added various syscalls for Human-Interface Devices (HID) such as gamepads
  • See new playbit/sys/syscalls/hid.h
  • See new PBSysGamepadButton and PBSysGamepadEvent in playbit/sys/syscalls/event.h
• Added various syscalls for PBNetTransport
  • See new PBSysNetTransportOpenStream in playbit/sys/syscalls/net_transport.h
  • See new PBSysNetTransportSetKeepAlive in playbit/sys/syscalls/net_transport.h
• Added PBSysTextureFormat_BGRA8
• Added syscalls for getting a texture's size
  • See new PBSysTextureGetWidth in playbit/sys/syscalls/texture.h
  • See new PBSysTextureGetHeight in playbit/sys/syscalls/texture.h
• Added syscall for opening file panels (dialogs)
  • See new playbit/sys/syscalls/file_panel.h
  • See new PBFilePanelEvent in playbit/sys/syscalls/event.h
• Added new PBSysFileOpenFlag_TRUNCATE and PBSysFileOpenFlag_EXCLUSIVE
• Added new PBSysFileOpenFlag_MODE_USER_RW, PBSysFileOpenFlag_MODE_GROUP_RW, and PBSysFileOpenFlag_MODE_OTHER_RW
• Added various syscalls and associated types specifically for creating files:
  • See new PBFileCreate in playbit/sys/syscalls/file.h
  • See new PBFileCreateOrPanic in playbit/sys/syscalls/file.h
  • See new PBFileCreateOrTruncateOrPanic in playbit/sys/syscalls/file.h
• Added new helper functions for converting flag open/create types
  • See new PBFileModeOfFlags in playbit/sys/syscalls/file.h
  • See new PBFileOpenFlagsOfMode in playbit/sys/syscalls/file.h
• Fixed an issue where a network connection could fail to reconnect
• Fixed an issue where a guest thread could hang upon a network disconnect
• Fixed an issue where a connection was not properly disconnected on app exit
• Fixed an issue where network messages could be become corrupted and unable to decode
• Added PEM-encoded root certificate fields certPem and certPemLen to PBSysNetTransportConfig
• Renamed PBSysNetTransportOpenFlags to PBSysNetTransportStreamFlags
• Added PBSysNetTransportFlags to PBSysNetTransportConfig
• Added PBSysThreadReadRandom to playbit/sys/syscalls/thread.h
• Improved no-gui codepaths to shut down faster than before
• Enabled use of WASM's expection-handling extension in guest programs
• Removed unused PBSysRight_GET_PROPERTY and PBSysRight_SET_PROPERTY
• Fixed a case where updating an observer could cause it to miss a signal
• Improved SysWindowTextplanCreate to accept a null pointer when len is zero

Developer tools

• Improved logging around failure to launch Playbit.app
• Fixed an issue where launched Playbit.app would never exit after no-gui program exits
• Improved detail in pb run --help message
• Fixed an issue where building an app with --no-gui would not be noted in the built app's manifest
• Added --colors flag for controlling ANSI color output

Examples

• Added notes example
• Added sync1 and sync2 examples
• Added jump-game example
• Fixed an incorrect comment in renderer-package
• Improved styling and simplified hello
• Slightly simplified game-of-life

Version 0.2

May 7 2026

Errata

A previous version of the 0.2 changelog erroniously said that a new library UI3 had been released. This was incorrect, and this library was instead later released in 0.3.

C API

• Added APIs for retrieving resources embedded into your wasm-compiled app
  • See PBAppResourceWithName and PBAppResourceAtIndex in playbit/app.h
• Added PBAppName to playbit/app.h
• Added PBAppId to playbit/app.h
• Renamed println to print
  • Use PBPrintf for formatted printing without automatic newline
• Added APIs for interacting with various window properties
  • See playbit/window.h
• Changed UIBoxIsClick to be called UIBoxOnClick
• Improved initial window presentation behavior
• Added PBStrLit for making PBStrSlice from c-string literals
• Deprecated previous catch-all PB_STR helper macro
  • For usage not covered by PBStrLit try PBStrSliceOf
• Added PBStr_FMT and PBStr_FMT_ARG macros for easier println formatting of strings
• Added new PBDrawRectWithStroke function to the drawing API
• Added new PBDrawTextWithPlan function to the drawing API
• Added new PBDrawTexturedRectExt and PBDrawTexturedRectExt2 functions to the drawing API
• Added new PBDrawTextLine and PBDrawTextMultiline functions to the drawing API
• Improved PBDrawBeginFrame to auto-allocate a draw API context if one is not set
• Improved implicit cached text drawing cache implementation in the drawing API
• Fixed an issue where usage of the PBArrayAllocAt macro would not compile
• Improved PBAnyArrayFree to now make PBArray go into a "null" state
  • v becomes NULL, len and cap become 0
• Fixed PBArenaFromAllocator ignoring size paramter
• Introduced new PBSemaphore
  • See new playbit/semaphore.h
• Added PBRGB and PBRGBA helper macros for creating PBColor values
• Added new PBColorToRGBA8 function
• Fixed an issue where PBDateFormat could format a date's month incorrectly
• Added new PBDateComponents function
• Added new PBTimeZoneUTCOffset2 function
• Added new PBRectangleOfRect and PBRectangleOfSize functions

Runtime

• Fixed various underlying thread correctness issues on macOS
• Fixed a rare deadlock when rendering during a window resize
• Improved the situation around some renderer setup race conditions
• Added various syscalls for audio playback
  • playbit/sys/syscalls/audio.h
• Added various syscalls for filesystem access
  • See new playbit/sys/syscalls/file.h
  • See new playbit/sys/syscalls/file_list.h
• Added clipboard access syscalls to the window object
  • Syscall: PBSysWindowClipboardWriteText
  • Syscall: PBSysWindowClipboardReadText
  • See playbit/sys/syscalls/window.h
• Added texture creation and modification syscalls
  • See new playbit/sys/syscalls/texture.h
  • See playbit/sys/syscalls/window.h
• Added various syscalls for Playbit network access
  • See new playbit/sys/syscalls/net.h
  • See new playbit/sys/syscalls/net_session.h
• Removed "scene graph" rendering syscalls
• Fixed floating point value handling of PBSysWindowSetRect
• Fixed monotonic clock not advancing when system is asleep on macOS

Playbit.app

• Improved display of recent apps to be sorted
• Added release notes to log shown on startup
• Fixed a bug which could cause some log messages to crash the app

Developer tools

• Increased default wasm stack size to 512 KiB
• Added command line flag --stack-size