SINGE 3.00
==========

  Unreleased


API Changes
-----------

- --gamedir names the directory holding the games, the .game files and
  the Singe support folder, so the executable can live anywhere.  It
  becomes the working directory; relative names count from it.  The
  Menu.sh the engine writes there runs the executable by its full path.

- Without --datadir the data directory is now data/ in the game
  directory (2.x wrote beside the game, which may be read only).  The
  menu's Menu.sh no longer needs to pass -d data.

- math.randomseed accepts fractional seeds (floored), so 2.x games that
  seed with os.clock() products run under Lua 5.4.

- A script launched by name (or by its directory) runs with its games.dat
  entry, as the menu would run it:  Singe finds the games.dat in the
  script's directory or up to three above, and applies the entry whose
  SCRIPT names the script, LEGACY_SPRITE_ARGS included.  Options typed on
  the command line keep their values.  Every game in a library therefore
  behaves the same whether it was started from the menu or from a shell.

- A game can be described rather than written.  Forge/Author.singe and
  Forge/AuthorCompile.singe take a table of layers, entities, behaviours
  and rules and compile it into an ordinary Singe game:  the rules become
  real Lua, so nothing walks a table every frame and the result can be
  read and edited by hand.  There is no notion of genre in it -- a game
  declares which of the engine's layers it uses, and that is the whole
  difference between a platformer and a quick-time event over video.  The
  vocabulary of conditions and actions is declared in a table rather than
  built into the compiler, so new kinds of game are entries rather than
  releases, and the "lua" action is the deliberate way out when a rule
  needs something the vocabulary cannot say.  See the manual.

- Forge runs as a game rather than only as a library:  started from the
  menu it opens on a chooser (its own descriptions, a new game from a
  starter, a copy of anything dropped into its directory), the keys, the
  mouse and the pad reach the editor, P saves, builds and plays what is on
  screen and comes back to it, and ESC closes or leaves.  Entities can be
  added, duplicated, deleted and typed field by field -- position, look,
  behaviours and their parameters, all from the manifest -- and renaming
  one renames it in every rule.  Conditions and actions are picked from
  the vocabulary with their help beside them, rules reorder, a rule's
  note is editable, and U undoes forty steps.  The compiler loads the
  runtime from Forge/, where it lives, so it no longer fails looking for
  a Singe/Author.singe that never shipped.

- An editor for those descriptions, Forge, which is itself
  a Singe game:  the canvas is the same overlay at the same coordinates the
  game will be played in, so what is placed is what is seen.  Entity list
  and details are an RmlUi document, the canvas beside them is drawn into
  the overlay and picked the way a light gun game picks a target, and the
  two compose because a button is offered to the GUI first while pointer
  motion is never consumed.  A description survives a round trip through
  it:  load, save, load again, and it compiles to the same game.  Forge is
  distributed on its own and no part of it ships inside Singe -- not the
  editor, not the compiler, not the runtime.  A game Forge builds carries
  its own copy of that runtime, so it runs on a machine that has never had
  Forge on it and cannot change behaviour because the engine moved on.

- A game released from Forge is standalone.  forgeExport writes the
  compiled script, a games.dat, the description it came from and a copy of
  the runtime into a directory of its own, taken out of Forge.  --pack turns
  that directory into a .game.  The game locates its own directory with
  debug.getinfo rather than trusting DIR, which names the directory of the
  script the engine was launched with -- not this one when a game is reached
  by dofile.

- The editor edits rules, not only entity positions:  Tab swaps the panel
  between the entities and the event sheet, the selected rule opens in
  place with its conditions and actions under it, and conditions and
  actions are added from the same manifest the compiler reads, so the rule
  editor needs no change when the vocabulary grows.  It is driven by keys
  as well as the pointer, which is how the bundled menu has always worked
  and what a cabinet needs.  ENTER types a value into the selected
  condition or action and moves to its next one, ESC puts it back;  a
  number typed in comes back a number.

- The name now expands to "SINGE Is Not a Game Emulator", in the banner,
  the manual, INSTALL, and the Windows file description.

- Framework.singe applies the legacy sprite argument order once even when
  a game loads it more than once.

- Hypseus Singe extensions, so games written for it run unchanged:
  spriteLoadFrames, spriteDrawFrame, spriteFrameWidth, spriteFrameHeight,
  spriteResetColorKey, discAudioSuffix, singeSetQuitKeyEnabled (with the
  Framework alias keyboardCatchQuit), vldpGetScale, vldpFocusArea,
  vldpResetFocus, vldpSetMonochrome, overlaySetMonochrome,
  vldpGetYUVPixel, controllerIsValid and controllerDoRumble.  Sprite calls
  take the handle first like the rest of 3.00; the LEGACY_SPRITE_ARGS
  shim covers spriteDrawFrame and spriteResetColorKey.

- More Hypseus Singe names, almost all of them supplied by
  Framework.singe over calls Singe already had:  setOverlaySize and
  setOverlayResolution over overlaySetResolution, rewriteStatus as a stub,
  and the six music calls over the sound family.  setOverlayLinearScale is
  a real engine call:  it smooths the overlay as the window scales it,
  which is the default and what Singe has always done, or takes the
  nearest pixel for crisp pixel art.

- The picture's place on screen is now one rectangle built from four
  things in order:  the window, --scalefactor (range widened from 50-100
  to 25-100), --shiftx and --shifty (new; they move the picture inside the
  room the scale left, -100 hard against one side and 100 against the
  other, which is what Hypseus's own mean -- so at full scale there is no
  room and a shift does nothing), and last the Sinden border, which is
  therefore still a border whatever the shift and the scale did --
  --scalefactor and --sindengun may now be used together.  --rotate (new;
  0, 90, 180 or 270 degrees)
  turns the whole presentation, video, overlay, GUIs, 3D scene and
  particles together, filling a portrait window on a quarter turn.  Mouse
  and light gun positions follow all of it, so a click lands where it is
  drawn.  Scripts move the scale and the rotation while the game runs with
  the Hypseus extensions vldpSetScale, vldpSetRotate and vldpGetRotate.

- Bezels.  --bezel names cabinet artwork in a bezels folder (--bezeldir
  names another folder, --bezelflip draws the artwork in front of the
  picture instead of behind it), and a Lua sidecar named after the
  artwork declares the cutout the picture is drawn in, in the artwork's
  own pixels:  CUTOUT = { x = 200, y = 120, width = 800, height = 500 }.
  With no cutout the picture keeps the window and --scalefactor,
  --shiftx and --shifty place it, as before.  A Sinden border goes to the
  edge of the window when artwork is loaded, because the gun's camera
  sees the whole screen; --sindenedge video|window overrides that.
  Scripts ask mainBezelLoaded() which artwork they got and choose with
  setOverlayOnTop whether the overlay sits above it.

- The arcade score panel behind the seven scoreBezel calls:  credits, and
  a score and a life count for two players, in a shipped RmlUi document
  (Singe/scoreBezel.rml and Singe/scoreBezel.rcss) with a seven segment
  look that a theme or a game may restyle.  It is off until a game asks
  for it with scoreBezelEnable, exactly as in Hypseus, and it sits in the
  room a bezel's cutout leaves above or below the picture, or along the
  bottom of the picture when there is none.  Hypseus's second argument,
  which chooses among its five scoreboards, is accepted and ignored.
  guiDrawScreen puts a game's own GUIs out there beside it:  it is
  guiDraw with the rectangle measured across the whole window.

- A settings file.  settings.cfg holds the options you would otherwise
  type on every command line, in Lua like controls.cfg and found the same
  four ways:  the directory Singe was started in, above and inside the data
  directory, and beside the game's script, with a later file winning key by
  key.  Its keys are the long option names without the dashes, so there is
  no second vocabulary, and a switch takes true or false.  A settings file
  is a set of defaults:  a games.dat entry for the game still overrides it
  and the command line always does.  Anything naming the game, naming a
  directory, or acting before the file could be found (--framefile,
  --gamedir, --datadir, --entry, --help, --apiversion, --noconsole, the
  packing tools) belongs on the command line, and a key that is not an
  option, is one of those, or carries a value the option will not take is
  an error naming the file and the key.  Singe/settings.cfg.example lists
  every key with its default.

- Options a cabinet owner has been missing, none of them with a short
  letter since the alphabet ran out:  --screen picks the display (counting
  from 1; a number too large lists the displays that are there),
  --idleexit quits after so many seconds with nothing touched,
  --startsilent starts muted until the first input, --monochrome starts
  the disc picture in grey, --linearscale chooses the overlay's filter,
  --nogamepad ignores the pads as --nomouse ignores the mice, --haptic
  caps the rumble a game may ask for (0 turns it off), --keymapfile names
  one controls.cfg instead of searching four places, --altaudio (and the
  AUDIO_SUFFIX games.dat key) plays <base><suffix>.ogg beside the disc's
  video for another language, --xratio and --yratio carry the gun
  coordinate scales a Hypseus light gun game reads with ratioGetX and
  ratioGetY, --fvalue carries one number to the game through getFValue,
  and --apiversion prints one machine readable line for a front end and
  exits.  --nosound, which had been accepted and quietly ignored, now
  actually mutes.

- Every controller Singe opens is now a gamepad, whatever it started life
  as.  SDL calls a device a gamepad only when it has a mapping for it, and
  an arcade encoder board, a spinner, a wheel or a flight stick usually has
  none, so such a device used to be invisible.  Singe now writes a
  straight-through mapping for it -- axes in order to the two sticks and
  then the triggers, buttons in order to the standard names, the first hat
  to the D-pad -- and opens it as an ordinary pad, so it reaches
  controls.cfg, GAMEPAD_0 to GAMEPAD_3 and every controller call like any
  other.  A device with more controls than the gamepad model can name loses
  the extras, and one whose buttons are not wired in that order will have
  them in the wrong places:  --program traces the mapping in SDL's own
  format so it can be pasted into a gamecontrollerdb.txt and rearranged.
  Singe now reads that file, from the four places it reads controls.cfg,
  and it and SDL's own database both win over the mapping Singe would
  write.  --mapjoysticks=false turns the writing off.

- Input options for a cabinet:  --gamepad_reorder says which physical pad
  fills which slot (enumeration positions from 0, as Hypseus writes them),
  --trigger_threshold says how far an analogue trigger must travel before
  it counts as a button (a per cent of full travel, Hypseus's unit),
  --joymouse lets the first pad's left stick drive the mouse cursor at
  --js_range speed so a light gun game is playable on a stick-only
  cabinet, --manymouse turns the many mouse mode on whatever the game asks
  for so a two gun cabinet can be fixed from outside, and
  --absolutes_only keeps only the devices that report an absolute
  position, which is what a real gun does.  controls.cfg gains DEAD_ZONES,
  a dead zone for one axis at a time, and TRIGGER_THRESHOLD; both leave
  every axis on DEAD_ZONE unless set, so nothing changes for anyone who
  does not ask.

- SWITCH_MOUSE_DISCONNECT reaches onInputPressed when a mouse or light gun
  is unplugged, so a gun game can say so instead of appearing to have
  died, and joyMouseEnable, joyMouseIsEnabled, controllerGetName and
  mouseGetName let a script drive and describe all of it.

- Alt-Enter switches between full screen and a window while the game runs,
  as it does in Hypseus.  Singe could not change the mode at all once it
  had started.

- Subtitles.  srtLoad reads a SubRip .srt and turns its timestamps into
  disc frames at the disc's own frame rate, so a line is found again after
  any search or skip; srtEnable shows them, srtPosition puts them where a
  game wants (1 to 95 per cent down the picture) and srtClear takes one
  off early.  They are drawn through a shipped RmlUi document,
  Singe/subtitle.rml with Singe/subtitle.rcss, both of which a game or a
  theme may replace, over the picture and following it wherever the scale,
  a shift, a bezel cutout or a rotation put it.  A malformed file answers
  false rather than dying.  overlayBanner puts a message of its own up the
  same way for about thirty frames.

- The disc picture gains three controls beside vldpSetMonochrome:
  vldpFlash puts one white picture up the way a real player flashes when
  it is searched, vldpSetBlend smooths the picture down its rows to take
  the edges off an interlaced transfer, and vldpSetLuma brightens or
  darkens it in eighths from half to one and a half without washing the
  colour out.  All three work on the decoded frame, cost nothing while
  they are off, and follow a frame file from one segment to the next --
  which vldpSetMonochrome now does too, and did not before.

- Sprites.  spriteRotateFrame turns one frame of a sheet and
  spriteDrawRotatedFrame draws it centred on a point, which is what
  spriteDrawFrame will not do since it ignores rotation and scale by
  design; spriteDrawGrid draws any rectangle of a sprite at its own size,
  which Singe had no way to do at all; spriteGetFrames counts a sheet's
  frames; and spriteLoadData and soundLoadData build a sprite or a sound
  from bytes held in a Lua string, for a game that unpacks its own assets.
  setOverlayOpacity fades the whole overlay and controllerHowMany counts
  the open gamepads.

- Music has its own volume.  The music family (musicLoad, musicPlay,
  musicStop with a real fade, musicPause, musicResume, musicIsPlaying,
  musicSetVolume, musicUnload) is now in the engine rather than shimmed
  over the sound family, and carries a gain of its own on Hypseus's 0 to
  128 scale:  musicSetVolume moves no sound effect and soundSetVolume
  moves no music.  Music starts as loud as the sound effects, at whatever
  --volume_nonvldp set.  Ten more Hypseus names -- hypseusGetWidth,
  hypseusGetHeight, takeScreenshot, mouseHowManyReal and the six
  spriteAnim ones -- are aliases in Framework.singe.

- trace.txt now opens with a header a bug report can be built on:  the
  version, the whole command line, the operating system, the processor,
  the renderer and GPU backend that were actually chosen, how video will
  be decoded, which audio decoders the build carries, the SDL versions
  built and linked against, the settings that were applied and the game.  It sits between two rules so it can be
  pasted whole.

- lfs.dir, lfs.attributes and lfs.symlinkattributes see inside a packed
  game (the union of its loose directory, its data overlay and the
  database), and lfs.mkdir and lfs.rmdir act on its data overlay, so
  frameworks that list or create their own directories work packed.

- Physics.  Any scene node can carry a rigid body on Jolt Physics:
  static, kinematic (follows its node and pushes) or dynamic (drives its
  node), shaped as a box, sphere, capsule, cylinder, a convex hull of the
  node's mesh or the mesh's triangles; mass, friction, bounce,
  velocities, forces and impulses; triggers; hinge, ball and slider
  joints with limits; a raycast; onCollision and onTrigger callbacks.
  The world steps at a fixed 60 Hz between animation and rendering and
  pauses with the game.  physicsSet2D keeps bodies in a plane for 2D
  games, which need no GPU (nodes now exist on every machine, so a
  Raspberry Pi 3 gets 2D physics without 3D).  New calls:  body*,
  joint*, physics*, and the
  BODY_*, SHAPE_* and JOINT_* constants; see the Physics chapter.  Needs
  SSE4.1 on x86 (2008 and later); the engine's first C++ (one wrapper
  file and the library), statically linked, no runtime to install.

- Soft bodies.  softNew makes cloth or a pressure body from a node's
  mesh (particles from its welded vertices, Jolt's stretch, shear and
  bend constraints, pressure for balloons) or a rope from the node to a
  point with a tube mesh the engine makes; they collide with everything
  rigid and the mesh is rewritten every frame.  softPin holds particles
  in place or to nodes; stiffness, mass, damping and pressure are
  tunable.  meshPlane takes subdivisions; nodeSetMaterial changes a
  material without the mesh.  New calls:  soft*, and the SOFT_*
  constants; see Soft bodies in the Physics chapter.

- Ragdolls.  ragdollNew derives capsules and swing-twist joints from a
  skinned model's skeleton; ragdollActivate hands the skeleton to
  physics from its current pose and the mesh follows the bones as it
  falls; motors (ragdollSetStrength) pull it back toward that pose;
  ragdollApplyImpulse shoves a bone; ragdollDeactivate returns it to
  animation.  New calls:  ragdoll*; see Ragdolls in the Physics chapter.

- Water.  bodySetWater fills a static body with water:  dynamic bodies
  inside float, sink and drift by Jolt's buoyancy against its surface,
  with drag and a current (bodySetCurrent, bodySetBuoyancy per body);
  players swim in it (playerIsSwimming, playerSetSwim, three-axis
  playerMove); a buoyant hull with vehicleNew(node, VEHICLE_BOAT) gets
  a propeller and a rudder (vehicleSetThrust, vehicleSetRudder).

- Vehicles.  A dynamic body becomes a car, a motorcycle or a tank on
  Jolt's vehicle constraint:  wheels are nodes the engine poses (spin,
  steer, suspension), the script drives with throttle, steering, brake
  and hand brake, and engine, gears, suspension, steering, brakes and
  anti-roll bars are tunable.  Motorcycles lean and balance with a spring
  scaled to the chassis; tanks pivot on the spot.  New calls:  vehicle*,
  and the VEHICLE_* constants; see Vehicles in the Physics chapter.

- Point lights inside geometry.  A bulb in a closed room, under a shade
  or inside a cabinet now shadows correctly:  cube faces render depth
  two-sided so closed meshes cast from inside, every shadow tap picks its
  own cube face so the seams along the cube edges are gone, the depth
  range fits the casters round the light instead of the scene centre,
  the bias grows with distance and grazing angle, and each face draws
  only what it can see.  nodeSetShadow excuses a mesh from casting.

- Character controller.  playerNew puts Jolt's CharacterVirtual on a
  node, as a capsule or any convex bodyNew shape:  it walks where
  playerMove says, climbs steps, slides along walls, refuses steep
  slopes, falls, jumps from the ground, rides kinematic platforms and
  shoves light dynamic bodies; onCollision and onTrigger report it like
  a body.  Works in 2D worlds as a platformer character, with tolerances
  scaled to the shape.  New calls:  player*; see Players in the Physics
  chapter.

- Linear lighting.  The scene is lit in linear light on a 16-bit float
  target and brought to the screen by a post pass with an exposure
  control (sceneSetExposure, in stops) and a tone curve (sceneSetTonemap:
  TONEMAP_NEUTRAL, TONEMAP_ACES, TONEMAP_NONE).  Colours given as 0-255
  are sRGB and decoded on the way in; textures are sampled as sRGB;
  bright light compresses instead of clipping.  Specular highlights are
  GGX with Fresnel, so roughness and metallic behave as they do in glTF
  viewers.  Existing scenes look a little different:  the same numbers
  now mean what they mean everywhere else.

- GUI.  Menus, HUDs and option pages can be RmlUi documents:  HTML-like
  RML styled by CSS-like RCSS, with layout, text wrapping, nine-slice
  panels from the game's own artwork, transitions, animations, form
  controls and a focus model a gamepad can drive.  guiNew(width, height)
  makes a GUI rendered to its own texture every frame; guiLoad puts a
  document in it (names through the vfs like spriteLoad, so packed games
  work), with guiShow, guiHide and guiClose; guiDraw composites it over
  the overlay in overlay coordinates (through the Sinden border and the
  overscan scale like the overlay itself), and materialSetGui shows it
  on a material in the scene, where sceneProbeGui gives the GUI and
  pixel under an overlay point.  guiSetInput routes the mouse and light
  gun, keys, typed text (SDL text input runs while a field has focus)
  and a pad's switches (directions as arrows, ACTION_1 as Return,
  ACTION_2 as Escape) to a GUI; what an element uses never reaches
  onInputPressed or onKeyPressed, and the rest falls through as before.
  guiSetHandler calls a Lua function for an element's click, change or
  submit; guiGetValue and guiSetValue read and write a control's value
  or an element's inner RML; guiLoadFont adds a face for every GUI.
  RmlUi's own Lua API runs on the game's state:  rmlui.contexts["gui0"]
  and its documents, a document's <script> blocks and on* attributes.
  Singe/gui.rcss is the shipped theme (.panel, .list, .muted and the
  styled form controls) and Singe/FreeSansBold.ttf the fallback face
  (family FreeSans, bold).  RmlUi (MIT) is added to LICENSES.  Test
  scenes scene36 to scene39 cover a document over the disc, a GUI on a
  material, input and handlers, and the pointer on a 3D surface.  See
  the GUI chapter.

- GUI effects.  Every RCSS effect now draws:  rounded and transformed
  elements clip their children to their shape (stencil clip masks),
  filter: opacity() fades a group as one, mask-image cuts by an image's
  alpha, box-shadow casts hard and soft shadows, filter and
  backdrop-filter take blur, drop-shadow, brightness, contrast, invert,
  grayscale, sepia, hue-rotate and saturate, and the linear-gradient,
  radial-gradient and conic-gradient decorators draw (the theme's
  panels, buttons and progress bars and the menu's list use them).
  The custom shader decorator is refused, gradients carry at most
  sixteen stops, effects nest at most eight layers deep.  guiGetStats()
  returns what the GUIs cost to render in the last frame (draw calls,
  layers, filter passes, mask writes, layer bytes, passes).  Test scenes
  scene40 to scene43 cover clip masks, layers, filters and gradients.

- The Pi decodes video through its V4L2 memory-to-memory device (the
  h264_v4l2m2m family of decoders) when the codec has one, falling back
  to software when the device is missing, as on a Pi 5 for H.264.  The
  trace reports which decoder is in use and the format the device hands
  back; --softwarevideo turns it off like the other hardware decoders.

- The Menu.sh and Menu.bat the engine writes now look beside themselves
  for a file whose name starts with Singe and run the first one, the way
  the launchers BatMaker writes already did, instead of naming the
  executable.  The executable's name carries its version, so a launcher
  that named it stopped working at the next release, and the thing that
  would have rewritten it was the launcher itself.  With --gamedir the
  executable is elsewhere and its full path is still written.

- Third-party libraries brought up to their current releases:  ffmpeg
  9.0.1 (from a 2023 development snapshot; libpostproc is gone with it),
  OpenSSL 3.5.8 LTS (from a 2023 development snapshot), Lua 5.4.9, zlib
  1.3.2, zstd 1.5.7, uthash 2.4.0, lsqlite3 0.9.7, luafilesystem 1.9.0,
  copas 4.12.0 (its new copas.future module is embedded) and arg_parser
  1.21.  sqlite3.lversion() reports the real lsqlite3 version instead
  of "unknown", and os.tmpname() returns a usable name again (the local
  mkstemp edit never filled in its template).  LICENSES now records the
  version of every vendored library.

- The bundled menu is an RmlUi document (Singe/Menu.rml styled by
  Singe/menu.rcss, filled and driven by Singe/Menu.singe):  every game in
  a scrolling list on the left, up and down to select, left and right to
  page, Start or any button to play, and a mouse works too (click a row
  to select it, click it again or the Start button to play, wheel to
  scroll the description).  The service tools are pages of the same
  document.  A machine without a GPU device, where guiNew fails, gets the
  same menu drawn into the overlay instead; see "One menu, two renderers"
  below.

- Physics debug drawing.  physicsSetDebug(DEBUG_*) draws the bodies in
  wireframe (coloured by motion state), joints and their limits, contact
  points and velocities as lines over the scene each frame, static shapes
  too with DEBUG_STATIC; lineDraw draws a script's own world-space lines
  for a frame, navDraw the baked navigation mesh.

- Compressed textures.  KTX2 files (Basis Universal, from
  util/compressTextures.py) stay compressed on the GPU in the block
  format the machine has (BC7, ASTC, BC3, or plain RGBA where nothing
  else exists), a quarter of the memory of PNGs or less.  A model whose
  file uses KHR_texture_basisu loads them on its own; materialSetTexture
  and the map calls take a .ktx2 name in place of a sprite; sceneGetStats
  reports the texture memory in use.  The Sponza test scene went from
  393 MB of textures to 99 MB.

- Hot reload.  singe --reload (-R) watches the game's loose script files
  and runs the game again from its script when one changes; F5 does the
  same, and singeReload() from a script.  The engine (window, GPU, disc,
  controllers) stays; everything the script made is remade by the script.

- Terrain.  meshHeightmap makes rolling ground from a greyscale image,
  materialSetTiling repeats a texture across it, a SHAPE_MESH body on it
  becomes a Jolt height field, and terrainGetHeight reads the ground
  height at a point.

- Sprites and text in the scene.  nodeSetSprite shows a loaded sprite on
  a node as a lit quad (nodeSetSpriteFrame picks a frame), nodeSetText a
  line of text in the selected font, and nodeSetBillboard turns any node
  to face the camera squarely or about its own up axis (BILLBOARD_*).

- Navigation.  navNew, navAddNode and navBuild bake a walkable mesh from
  the scene's geometry on Recast; navPath, navNearest, navRaycast and
  navRandomPoint query it on Detour; agents (navAgentNew, navAgentMoveTo,
  navAgentStop, navAgentGetVelocity, navAgentIsArrived, navAgentSetPlayer)
  walk it on DetourCrowd without walking through each other, moving their
  nodes or driving a player controller, with onNavArrived when they get
  there; navSave and navLoad keep a baked mesh.  Recast Navigation is
  vendored under thirdparty/recastnavigation (zlib licence).

- Bloom and views.  sceneSetBloom makes everything brighter than a
  threshold glow, blurred over a half-size chain before the tone curve.
  viewNew renders a second camera to a texture every frame (viewSetCamera
  points it) that materialSetView shows on any surface:  monitors,
  mirrors, portals.  Each view turns billboards to its own camera and
  draws transparency back to front from it.

- Particle extras.  Trails (emitterSetTrail:  a fading ribbon behind
  each particle, 2D and 3D), collisions with a floor or, by ray cast,
  the physics world (emitterSetCollide, COLLIDE_*), lit particles shaded
  by the lights and sky (emitterSetLit) and soft particles that fade
  where they meet geometry (emitterSetSoftness).

- Culling and instancing.  Meshes outside the camera's view are skipped,
  and copies of one mesh with one material draw as a single instanced
  call (their matrices in a per-frame buffer the vertex shaders read), in
  the shadow passes too.  sceneGetStats reports the draws collected, the
  draws in view and the draw calls made.

- Cascaded shadows.  A directional light's shadow is split into up to
  four maps along the view (sceneSetShadowCascades, three by default),
  each fitted to a slice of the camera's view out to
  sceneSetShadowDistance and snapped to its texels, so shadows in a
  large level are sharp up close and steady as the camera moves.

- Sky, environment light and fog.  sceneSetSky wraps the scene in an
  equirectangular panorama (Radiance .hdr, PNG or JPEG) drawn behind
  everything and lighting it:  its diffuse light replaces the ambient and
  its reflections show on metals and glossy surfaces, blurred by
  roughness (sceneSetEnvironment switches that off, sceneSetSkyIntensity
  scales it).  sceneSetFog fades meshes and particles toward a colour
  between two distances.

- Positional sound.  A playing channel can follow a scene node
  (soundSetNode) or sit at a point (soundSetPosition) and is then panned
  and faded by distance (soundSetRange) as heard from the camera or a
  chosen node (soundSetListener); soundGetPosition reports where it lies;
  soundSetPan pans a channel for 2D games; soundPlay takes a loop count.

- Animation blending.  animationPlay takes a fade in seconds and
  crossfades from the clip that was playing, or from the pose the nodes
  are in when nothing was (so a ragdoll eases back up); up to four clips
  play on layers above the base (animationPlayLayer), each with a weight
  (animationSetLayerWeight) and an optional mask limiting it to part of
  the skeleton (animationSetLayerMask); animationStop takes a layer.

- Material maps.  A material can carry a normal map, an occlusion map, a
  metallic-roughness map (glTF's packing) and an emissive map beside its
  base texture, and a loaded model brings its own.  Every mesh has
  tangents:  a model's when the file carries them, computed from the UVs
  otherwise.  New calls:  materialSetNormalMap, materialSetOcclusionMap,
  materialSetMetallicRoughnessMap, materialSetEmissiveMap.

- Mipmaps.  Every scene texture carries a full mipmap chain generated on
  the GPU at load and is sampled with anisotropic filtering, so textures
  seen small or at a grazing angle no longer sparkle or moire.
  materialSetFilter(material, FILTER_NEAREST) keeps pixel art crisp.

- Particles.  Emitters spawn, move and age particles from a recipe (rate,
  life, speed, direction and spread, gravity, drag, size, colour and spin
  over life, a birth radius, a pool cap) in the overlay and in the 3D
  scene alike.  A 2D emitter draws on the GPU above or beneath the
  overlay when the script asks (emitterDraw); a 3D emitter sits on a node
  and draws camera-facing billboards after every mesh, depth tested, in
  world units.  Any loaded sprite is the picture (a random frame per
  particle from an animated one); without one, a soft disc.  Normal or
  additive blending.  New calls:  emitter*, and the PARTICLE_* constants;
  see the Particles chapter.

- 3D scenes.  A game can draw a 3D scene between the disc video and the
  overlay:  primitive meshes and script-built geometry, materials with
  colour, textures from sprites, the disc or a loaded video, metallic and
  roughness, up to eight lights each able to cast shadows (cube maps for
  point lights), any node as the camera, and glTF 2.0
  models (.glb, self-contained) with node animation, skinning and morph
  targets, placed any number of times.  Everything is a node in one tree.  New calls:
  scene*, node*, mesh*, material*, light*, camera*, model*, animation*,
  and the LIGHT_* constants; see the 3D Scenes chapter of the manual.
  Needs a GPU with Vulkan, Direct3D 12 or Metal; the Raspberry Pi 4 is
  the minimum Pi (the Pi 3 has no Vulkan driver).  2D games run as
  before without one.  The renderer now runs on
  SDL's GPU device where there is one.

- A game can be one file:  singe --pack DIRECTORY GAME.game writes the game's
  scripts, art, sounds, fonts, and video into an SQLite database, and
  singe GAME.game (or the menu, which lists every .game file beside the game
  directories) runs it.  Nothing in a game has to change to be packed:
  every name a script uses (dofile, require, io.open and friends,
  spriteLoad, soundLoad, fontLoad, videoLoad, framefiles, controls.cfg)
  goes through one lookup that tries a loose directory named like the
  database, then the game's data directory, then the database, so
  packed games can be modded by dropping files beside them and files a
  game writes land under data/<game>/files.  Inside a database names
  are matched without regard to case and a leading own-directory prefix
  ("DLe/Cfg/x") is ignored.  singe --unpack GAME.game DIRECTORY restores
  the files and singe --patch GAME.game SOURCE replaces files from a
  directory or a patch database in one transaction.  --entry=N picks
  which games.dat entry a .game launch runs.  Loose games are
  untouched by all of this.  Scripts get SQLite for their own data with
  require("sqlite3").  The archive installer (.game, .tool, and .patch
  archives dropped beside the binary) is gone along with libarchive; a
  game is a .game file or a directory, copied into place.

- Video is decoded by libavcodec directly; FFMS2 is gone.  Seeking is still
  frame exact, indexing is faster, and the index files in the data
  directory use a new format (old ones are rebuilt automatically).
  Multi-channel audio is downmixed to stereo instead of refused.  Indexing
  is a few seconds at most, so the indexing screen and its artwork are gone.
  Video is
  decoded by the platform's hardware decoder when there is one (VA-API or
  VDPAU on Linux, D3D11VA on Windows, VideoToolbox on macOS) and falls
  back to software otherwise; --softwarevideo forces software.

- Singe is built on SDL3 (SDL 3.4, SDL3_image, SDL3_mixer 3.2, SDL3_ttf)
  instead of SDL2.  Nothing changes for scripts:  the same functions,
  constants, scancodes, and controls.cfg names.  SDL2_gfx is gone; sprite
  and video rotation and scaling are done by the engine itself.

- The sprite handle is now the FIRST argument of spriteDraw(), spriteLoop(),
  spriteQuality(), spriteRotate(), spriteRotateAndScale(), spriteScale(), and
  spriteSetFrame(), matching the video*() functions.  Move the last argument
  of each call to the front.  Games that cannot be edited can set
  SINGE_LEGACY_SPRITE_ARGS = true before loading the framework, or add
  LEGACY_SPRITE_ARGS = true to their games.dat entry.  See "Migrating from
  Singe 2.10" in the manual.

- Singe is no longer laserdisc only.  A games.dat entry with a VIDEO is a
  laserdisc game; one with the line missing or blank runs without a
  disc, on a canvas sized by CANVAS_X/CANVAS_Y (default 720x480), the
  disc functions become harmless, and discGetState() returns the new
  DISC_EJECTED.  On the command line --disc (implied by --framefile)
  declares the disc, since a video found beside the script no longer
  does; --canvas=WxH sizes the canvas.  Existing games.dat files need no
  change.  Scripts can test SINGE_DISC.

- mouseSetEnabled(bool) and singeSetPauseKeyEnabled(bool) added.  The old
  mouseEnable/mouseDisable and singeEnablePauseKey/singeDisablePauseKey are
  now aliases defined in Framework.singe.

- Handles, counts, and frame numbers are returned as Lua integers.
  videoIsPlaying() returns a boolean.  mouseSetMode() returns nothing.

- onControllerMoved() receives the controller index (0 to 3), not SDL's
  instance ID.  onMouseMoved() in MANY_MOUSE mode receives real relative
  motion in its third and fourth arguments.

- Runtime errors inside callbacks now end the game with a traceback, the way
  argument errors always have.

- Held keys no longer auto-repeat in MODE_NORMAL.

- The engine parks the disc on frame 1 before the script runs; the framework
  no longer seeks when it is loaded, so threaded games keep their own
  startup positioning.

- The pause key now pauses the whole game.  The engine freezes the script
  (no callbacks, no singeMain), holds sound completions, releases and later
  re-presses held inputs, and draws a PAUSED indicator.  It acts on the key
  press, and SWITCH_PAUSE reaches the script only when the key is disabled
  with singeSetPauseKeyEnabled(false).  singeSetPauseFlag() still pauses
  media without freezing the script.  Gamepad and mouse buttons mapped to
  pause, quit, screenshot, or grab now work in MODE_FULL too; keyboard
  mappings stay raw there.

- Video decoding runs on its own thread per video, so a discSearch() far
  from a keyframe no longer stalls the game loop; the previous frame stays
  on screen until the new one is ready.  The laserdisc and framefile videos
  are handed to the GPU as YUV and converted there instead of on the CPU,
  and each video reports its keyframe spacing to the program trace when
  loaded, with a warning there when seeks may be slow.

- Constants that used to be duplicated in Framework.singe (SWITCH_*,
  FONT_QUALITY_*, MODE_*, MOUSE_*, OVERLAY_*, RENDER_*, SOUND_ERROR_*) are
  now defined by the engine.  New:  DISC_STOPPED/DISC_PLAYING/DISC_PAUSED
  for discGetState(), SINGE_VERSION_MAJOR/MINOR/STRING, and the SINGE_*
  input code layout that Framework.singe builds GAMEPAD_N and MOUSE_N from.

- Audio and video are kept in sync from the audio clock.  The engine
  measures the audio device's queue at startup instead of guessing, uses
  small mixer buffers, and honours a container whose first video frame is
  timestamped after its first audio sample.  For delay the engine cannot
  see (receivers, Bluetooth, DACs) there is singeSetAudioDelay(ms) /
  singeGetAudioDelay(), the games.dat key AUDIO_DELAY, and
  --audiodelay=MS; positive values mean the audio is heard late.

- The menu has an audio delay calibration screen for the machine's own
  delay (DAC, receiver, Bluetooth, display).  Press the service key on
  the game list; a click plays once a second and the screen flashes.
  Adjust with the stick until the flash and the click coincide, then
  press button 1 to save.  The value is kept in machine.cfg in the data
  root and applied to every game on the machine, from the menu or the
  command line, on top of any per-game AUDIO_DELAY.  Scripts can read and
  set it with singeGetAudioCalibration() / singeSetAudioCalibration(),
  read the measured device queue with singeGetAudioLatency(), and now
  have singeGetTicks() for a wall clock in milliseconds (os.clock() is
  processor time and drifts).
- Inside a packed game a relative name with a ".." component resolves
  nowhere:  io.open returns nil and "NAME reaches outside the game",
  io.lines, io.input and io.output raise it, lfs.mkdir and lfs.rmdir
  return nil with it, and asset loads report the file as missing.  The
  packer already refused such names; the lookup now enforces the rule at
  run time.  lfs.dir on a packed directory lists its entries sorted
  without regard to case.

- One rule for the data directory on every launch (command line,
  games.dat, scriptPush and scriptExecute):  with --datadir, or for a
  packed game, a directory named for the game under the base; otherwise
  the game's own directory.  scriptPush of a loose game without --datadir
  used to write under the current directory.

- Color components handed to lightSetColor, materialSetColor (alpha
  too), materialSetEmissive, lineDraw and navDraw are clamped to 0..255,
  as colorForeground and colorBackground always were; they used to wrap.

- materialDelete on the private material of a sprite or text node is an
  error ("belongs to a sprite node; clear the sprite instead") instead
  of freeing a slot the node still used.

- lightSetCone raises the outer angle to at least the inner angle.

- Packed games:  the data directory is always <base>/<database name>/
  <script directory>/.  An archive whose script sat in a subdirectory
  (Game/Main.singe) wrote to <base>/Game/, shared with every archive of
  that layout; its saves now belong under <base>/<name>/Game/ and must be
  moved by hand.  Archives whose script sits at the root are unaffected.

- Packed games:  a path naming the .game file itself (Games/DLe.game,
  with or without a trailing separator) addresses the database root, as
  "." does from inside:  lfs.dir lists it and lfs.attributes reports a
  directory, while io.open on it returns nil and lfs.mkdir and lfs.rmdir
  refuse it.  Engine-owned names (Singe/ and the data directory) may use
  ".." as long as they stay below that prefix; any other ".." inside a
  packed game is still refused.

- lfs.attributes inside a packed game answers as the real lfs does:  the
  whole table (mode, size, modification and the rest) with one argument,
  one field by name (an unknown name raises "invalid attribute name"),
  or a table of the caller's filled in; a missing file returns nil, a
  message and the error number.

- sceneProject returns false with 0, 0, 0 before the scene has rendered
  a frame, instead of inf and nan.

- softNew removes the node's existing soft body before it looks at the
  mesh, so a call that fails leaves the node with none; softNew on a
  node carrying a rope fails with "needs a mesh" (the tube was the
  engine's) instead of reading freed memory.

- navAgentNew keeps the radius and height at 0.01 or more, as navNew
  does, so onNavArrived fires for an agent given a radius of zero.

- Three Hypseus names the bytecode-only games turned out to need.
  controllerSetPadding(boolean) and controllerGetPadding() are accepted;
  the getter always answers 0, because Hypseus's offset marks a switch
  code as having come from a gamepad and Singe's mapped switches carry no
  such mark.  videoGetVolume() with no argument answers the laserdisc's
  volume on Hypseus's 0 to 64 scale, which its games double into
  musicSetVolume.  require("md5") gives the PUC-Rio md5 library Hypseus
  bundles, all five of sum, hexsum, exor, crypt and decrypt, so a game
  written against it behaves the same here; note that library names its
  sumhexa hexsum.

- The ARM64 build carries the V4L2 stateless decoders:  AV1, H.264,
  HEVC, MPEG-2, VP8 and VP9.  These reach the hardware on the boards
  whose kernel drivers use the V4L2 Request API rather than the older
  memory-to-memory one -- Allwinner's Cedrus, Rockchip's rkvdec and
  hantro, the Pi 5's rpivid, i.MX8's hantro -- none of which the engine
  could use before.  Singe tries them first on ARM, then Rockchip's MPP,
  then stateful V4L2, and decodes in software when a board offers none.
  Desktop platforms are untouched.  The support is Jonas Karlman's
  V4L2 Request patchset for FFmpeg, carried in thirdparty/ffmpeg; it
  brings a runtime dependency on libudev, which these boards all have.

- The Raspberry Pi build target is now linux-aarch64 and its binary is
  Singe-v3.00-Linux-aarch64.  Nothing in it was ever Pi specific:  the
  V4L2 decoder it builds talks to any memory-to-memory device, so the
  same binary serves Amlogic, Exynos, Qualcomm and other ARM64 Linux
  boards whose kernel offers one.  The build system now decides by
  architecture, and by whether a sysroot is in use, rather than by a
  platform name that stood for both.  cmake/zig/piPackages.cmake is
  cmake/zig/arm64Packages.cmake, and the command is
  ./build-all.sh linux aarch64.

- src/main.c now includes windows.h where it reads the processor name
  out of the registry, which the Windows build had been failing without.

- A hardware decoded frame stays NV12 the whole way to the texture
  instead of being converted to planar YUV on the CPU first.  The picture
  is identical:  the GPU does the same conversion when it samples either
  way.  Measured on an RX 7900 XTX at 720x480 the difference was inside
  the noise, so this is for the small ARM machines where a per-frame
  conversion is worth more than it is on a desktop; it has not been
  measured on one.

- Rockchip's rkmpp decoders are built and used when the Rockchip Media
  Process Platform library is present, and ignored everywhere else.  The
  superbuild probes for rockchip_mpp with pkg-config rather than asking
  for --enable-rkmpp unconditionally, which would fail every configure on
  a machine without it.  Untested:  no Rockchip hardware here.

- The manual now says plainly that the Hypseus API is for compatibility
  and not for new games, in the Lua API Reference introduction and again
  at the head of the Hypseus Compatibility section.  Every Hypseus name,
  and every Hypseus argument form on a function that otherwise takes
  Singe's own, says so in its own entry.

- videoSetVolume(volume), with one argument instead of three, sets the
  laserdisc's volume on Hypseus's 0 to 64 scale, the twin of the bare
  videoGetVolume().  A level outside that range is ignored rather than
  fatal, as in Hypseus.

- drawTransparent(boolean), getUserString(), mouseGetPadding() and
  spriteBlend(boolean, sprite) are registered, completing the set of
  names Hypseus's engine exposes.  All four are compatibility answers:
  Singe carries transparency in the alpha channel rather than a colour
  key, sends no statistics and so has no machine ID to report, adds no
  offset to mouse input codes, and never has blending switched off.

- allowSocketCall() and setOverlayFullAlpha() are registered so a game
  that calls them does not stop on a missing function.  The first always
  answers false:  Hypseus reports whether the user let it send data to a
  stats server, and Singe sends nothing anywhere.  The second is accepted
  and ignored:  it asks for an overlay that blends its alpha channel
  rather than thresholding it, which Singe's overlay has always done.

- The other Lua modules Hypseus exposes are here too, whether or not a
  game asks for them:  require("bit") is LuaBitOp, require("random") a
  Mersenne Twister generator, require("cjson") Lua CJSON and
  require("lpeg") LPeg.  Singe already had the rest of Hypseus's list
  (lfs, socket, rs232) and opens every standard Lua library besides.

- materialSetCutoff(material, cutoff) discards the texels whose base
  colour alpha falls below the cutoff, in the lit pass and in the shadow
  pass alike, so cutout foliage casts cutout shadows.  What survives the
  cutoff is drawn fully opaque, which is what glTF means by MASK as
  against BLEND:  the sampled alpha is not passed on, so nothing behind
  the scene shows through a leaf.  glTF's MASK alpha mode now sets the
  cutoff from the file's alphaCutoff instead of warning that the material
  would be drawn opaque; BLEND and OPAQUE are unchanged.  Materials that
  never set a cutoff keep drawing every texel.

- --deterministic[=MS] runs the engine on a virtual clock stepped MS
  milliseconds (default 15) once a frame instead of on real time, steps
  the disc one video frame a frame with it, and seeds Lua's generator
  and the engine's from the same number, so a screenshot taken at a
  fixed frame number is byte identical between runs.  It is a testing
  facility:  audio and pacing are meaningless in it.  Settable as
  deterministic in settings.cfg.  With the option absent nothing
  changes.

- Every image format the bundled FFmpeg can decode now loads, not only
  the ones SDL_image reads:  TIFF, OpenEXR, JPEG 2000, DDS, PSD, DPX,
  and AVIF and HEIC through a vendored dav1d.  spriteLoad,
  spriteLoadData, spriteLoadFrames, meshHeightmap, --bezel artwork,
  glTF embedded textures and the GUI's images all take the same path:
  SDL_image first, FFmpeg for whatever it turns down.  sceneSetSky
  gains the same fallback and keeps a floating point source's range, so
  an OpenEXR sky is lit correctly rather than clipped.

- AV1 video plays.  FFmpeg's own AV1 decoder is hardware only and said
  "Your platform doesn't support hardware accelerated AV1 decoding" on
  any machine without an AV1 capable GPU; the vendored dav1d is the
  software decoder, and it is what brings AVIF with it.

- Every audio format the bundled FFmpeg can decode now loads as a sound
  or as music:  AAC, ALAC, AC-3, WMA, APE, TTA, Speex and AMR among
  them.  An AAC track used to play when it was the audio of a video and
  fail when it was a sound effect.  Chiptunes arrive with a vendored
  game-music-emu (NSF, NSFE, SPC, VGM, GBS, AY, GYM, HES, KSS and
  SAP), and the tracker
  formats libxmp was already reading -- MOD, S3M, XM, IT and fifty-odd
  others -- are now documented rather than merely present.

- MIDI files play, synthesised with TinySoundFont.  Singe ships no
  sound bank, because a good one is tens of megabytes for a format
  almost no game uses:  name one with --soundfont FILE, put one at
  Singe/soundfont.sf2 so a packed game carries its own, or let it find
  the one your distribution installed.  The trace header says which was
  used.  SDL_mixer's own MIDI decoder wants a GUS patch set almost
  nobody has, so a .mid failed to load while the trace claimed a MIDI
  decoder was there.

- MIDI ports, in and out, for a cabinet driving a real sound module or
  reading a keyboard or a control surface as an input device:
  midiInputCount, midiInputName, midiOpenInput, midiCloseInput,
  midiIsInputOpen and the same five for output; midiSend for any
  message at all; midiNoteOn, midiNoteOff, midiProgramChange,
  midiControlChange and midiPitchBend; midiRescan for a device plugged
  in while the game runs; and an onMidiMessage(status, data1, data2,
  bytes) callback.  Channels are 1 to 16.  ALSA's sequencer on Linux,
  CoreMIDI on macOS, the multimedia MIDI calls on Windows.  On Linux
  the library is opened at run time, as SDL opens the same one for
  audio, so a machine without it simply has no ports.

- spriteLoad(name, width, height) rasterises a vector picture -- an SVG
  -- to fit that box, keeping its proportions, instead of taking the
  file's own size, which for an icon is usually 16 or 24 pixels.  Every
  other format ignores the size.

- --deinterlace off|auto|on, automatic by default, for a laserdisc rip
  that kept its interlaced fields and combs on a progressive display.
  Automatic touches only the frames a file marks interlaced, so a
  progressive disc pays nothing; on is for a file whose flags are
  wrong.  Settable as deinterlace in settings.cfg.

- Fonts gain what FreeType was built without:  WOFF and WOFF2, colour
  bitmap glyphs, colour vector glyphs, and complex script shaping
  through HarfBuzz, so Arabic, Hebrew and the Indic scripts join and
  order correctly instead of coming out as unjoined letters.

- A framefile opens its segments as the disc reaches them instead of
  opening every one at startup.  A long framefile -- typing-md2 has 213
  segments -- held a demuxer open for each, which cost hundreds of file
  descriptors and could push a game past the 1024 that glibc's select
  refuses to look past, aborting it inside a fortify check.  At most
  four segments are open now:  the one playing, the one after it (opened
  ahead so the changeover costs nothing), and room for a seek to move
  between two.  Measured on a twelve-segment game, 75 open descriptors
  became 24.  A framefile naming a file that does not exist still fails
  at startup, as it always has.

- The game kit:  five things every game was writing for itself.

  saveGet, saveSet, saveGetAll, saveSetAll, saveDelete, saveClear and
  saveFlush keep a table between runs, as JSON in the game's own data
  directory.  Values may be numbers, strings, booleans or tables of
  them, nested; whole numbers come back whole.  Tables are copied in and
  out, so what you set is what is saved and what you read back is yours
  to change.  saveGetAll and saveSetAll read and replace the whole save
  in one step, which is how an old save is moved to a new layout without
  a moment in between where it is empty.  One write at the end of any
  frame that changed something, and again at shutdown; saveFlush writes
  now, for a cabinet that may lose power.  The file is renamed over the
  old one, so a write that is interrupted leaves the previous save
  rather than half of a new one.

  timerAfter, timerEvery, timerCancel and timerIsActive run something
  later without counting frames.  They use the engine's clock, which is
  the virtual one under --deterministic, so a timed game repeats
  exactly, and they fire with the rest of the frame's callbacks.

  tweenValue moves a number from one value to another over time on a
  curve, with tweenCancel and tweenIsActive beside it and twenty-two
  EASE_ curves to pick from.  It hands the number to your function
  rather than moving a node itself, so it works on anything.

  collideRects, collideCircles, collideRectCircle, collidePointRect,
  collidePointCircle, collidePointPolygon and collideSegments answer
  whether two flat things touch.  Plain functions, no handles.  Jolt
  already answered this in three dimensions; nothing answered it for the
  overlay, where light gun hitboxes live.

  statsEnable and statsIsEnabled show the developer's overlay:  frame
  time and its worst, frame rate, Lua memory, what is alive, how many
  draw batches, and what the disc is doing.  Drawn with SDL's own debug
  font, so it needs no asset, and drawn after singeScreenshot takes its
  picture, so it never lands in a screenshot.

- Four more Lua libraries are bundled:  middleclass for classes, lume
  for the small things (lerp, clamp, round, shuffle, split, serialize),
  inspect for printing a table in a readable shape, and bump for moving
  things that must not pass through each other -- which is what the
  collide calls deliberately do not do.

- Player handles.  The name on a leaderboard is a handle, not an email
  address:  three to twenty characters of letters, digits, hyphens and
  underscores, chosen once.  An operator can rename somebody; a player
  cannot, and an email address cannot be changed at all.  Handles are
  checked against a list the operator maintains -- identities nobody
  should claim, and words with no place on a screen in a public room.

- Online:  accounts, a game catalogue, and high scores.  A cabinet can sign
  in to a master service (master.singeengine.com by default), browse every
  game the service offers, download and update them, and post scores to
  leaderboards.  Two new service tools cover the setup:  Online Account
  signs in, creates an account, recovers a password and sets the server
  address;  Get Games lists the catalogue, marks what is installed here,
  and downloads, updates or removes it.

  A game posts a score in one line -- scoreSubmit(points) -- plus
  scoreBoard, scorePlayerName, scoreWaiting and scoreUpdate.  The account
  belongs to the machine rather than the game, so a game uses whatever
  sign-in the menu made.  A score is queued to disk and sent when there is
  a connection:  a cabinet is often offline, and a game must never stall
  on the wire to show its own board.

  Nothing blocks a frame.  Singe/Net.singe is an asynchronous HTTP client
  driven from the frame loop, because Lua here is cooperative and
  ssl.https.request would stutter a JSON call and make a large download
  look like a hang.  It does not use LuaSec's https module at all:  that
  ships with verify = "none", which encrypts the connection and
  authenticates nobody.  A connection is verified against a pinned public
  key instead.

  A download is checked against the digest the catalogue published before
  it replaces anything, so a transfer that arrives wrong fails rather than
  installing a game that will not run.  Downloads resume.

  New engine calls:  utilSha256(data) for exactly that checking, and
  singeGetGameId() for the GAME_ID a games.dat entry can now carry, which
  is what a leaderboard is kept under.  A game without one can be played
  but not ranked.

  A game the service withdraws keeps working on the cabinets that have it.
  All that stops is being offered an update, and the menu shows it as
  "installed, no longer offered" so it can still be removed from there.

  scoreBegin() tells the service a play is starting, and the score that
  follows carries how long it took measured on the server's own clock.
  That is the one number in a submission that has not been through the
  player's machine.  Nothing is rejected on it -- it is shown to the
  operator beside the score, and the judgement stays a person's.

  A submitted score is a claim and the design says so:  the cabinet is the
  player's own machine.  The service records who claimed what, rate limits
  submissions, and flags outliers for a person rather than pretending to
  verify them.

- One menu, two renderers.  Singe/MenuClassic.singe is gone:  it was the
  whole menu written a second time, and the two copies duplicated their
  game list, their selection, their menu.dat handling and their games.dat
  walk almost line for line.  Singe/Menu.singe is now everything the menu
  is and draws nothing, and it picks one of two renderers at startup from
  the new singeHasGpu():  Singe/MenuDocument.singe for a machine with a
  GPU device, Singe/MenuOverlay.singe for one without.  A machine with no
  Vulkan, Direct3D 12 or Metal driver therefore gets the menu -- and all
  ten service tools -- without anyone editing a launcher, which is what
  editing Menu.sh used to be for.

  Both renderers take the same keys, so the overlay one now moves the
  selection with up and down and pages with left and right, as the
  document one does; it shows one game at a time rather than a list, and
  clips a description too long for its column rather than scrolling it.
  MENU_OVERLAY = true in menu.dat forces it on a machine that has a GPU.

  singeHasGpu() answers whether the GPU device came up.  guiNew and the
  scene calls end the script rather than returning false, so a game that
  can do without one had no way to ask.

- The service tools.  Pressing the SERVICE key on the bundled menu now
  opens a list of ten screens rather than the audio delay screen alone:
  Audio Delay, Input Test, System Information, Light Gun, Sound Test,
  Display, Disc Test, Saved Data, MIDI Ports and Frame Statistics.
  Button 2 backs out of a tool, the service key leaves.  They live in
  Singe/Tools.singe, which the engine extracts beside Menu.singe.  Nothing
  there draws:  a tool builds a list of rows and the menu draws them, so
  the same ten run on both renderers and a cabinet builder adding one
  writes no drawing code at all.

  Four calls were added for them, and are worth having on their own:

  singeGetSystemInfo() returns everything the trace header knows in one
  table -- version, operating system, processor, renderer, 3D device,
  video decoders, audio formats, SoundFont, MIDI, window and canvas
  sizes, this game's data directory and the data root every game writes
  under -- so a bug report can be a photograph.

  vldpGetShift() and vldpSetShift(x, y) move the picture within the
  window while the game runs, the running equivalent of --shiftx and
  --shifty, beside vldpGetScale and vldpSetScale.

  singeSaveGeometry() keeps the scale, shift and rotation for this
  machine, in the same machine.cfg the audio delay uses, and the engine
  applies them to every game it starts afterwards unless the command
  line names its own.  A monitor is squared up once, not once per game.
  The file is called machine.cfg rather than audio.cfg, because the
  audio delay is no longer all it holds.

  discGetFrameCount() answers how many frames the disc has.  A framefile
  answers for the whole disc rather than the segment playing.

  SINGE_CONTROLLER_AXES and SINGE_CONTROLLER_BUTTONS join the input
  layout globals, so a service screen can walk a pad without knowing the
  numbers.

- Subtitles carried inside the video file:  discGetSubtitleTracks(),
  discGetSubtitleLanguage(track) and srtLoadTrack(track), which reads
  one track out of the disc's own container and loads it exactly as
  srtLoad loads a .srt beside the game.  SubRip, WebVTT, ASS and MOV
  text are read, with ASS override tags stripped; picture subtitles
  (VobSub, PGS) are counted so the numbering matches other players, but
  cannot be read, because there are no words in them.



Fixes
-----

- A machine with no enumerable mouse keeps its pointer.  ManyMouse reads
  /dev/input/event* directly where there is no X server, and those nodes
  are root:input, so an account that was never added to the "input" group
  enumerated nothing -- and Singe then switched off all mouse input,
  including SDL's own pointer, which single-mouse mode is the only user
  of.  On a KMSDRM cabinet or handheld that left the mouse and the light
  gun dead with only "No mice detected" to explain it.  Only --manymouse
  needs those devices now, and the message names the group.

- The menu's intro is drawn, not played, and runs straight into the menu.
  A charge goes off, the Singe dragon and name fly out of it toward the
  camera with the dragon's wings beating, the tagline fades in, the dragon
  rears and breathes flame -- and then the grid the menu sits on comes up
  out of the dark beneath the logo while the smoke is still clearing, the
  logo lifts away, and the menu takes the screen.  The dragon settles
  centred on the sun rather than above it, with the name below crossing the
  horizon, so the sun is a disc behind the animal instead of a rim around
  the pair of them.  It is one scene from the
  first frame to the last:  there is no cut and nothing loads at the join,
  and the menu takes input when the logo has gone rather than when a video
  frame number passes.  Returning from a game starts the same timeline past
  the end of the intro, so it lands on the settled backdrop.  The two
  models it is made of are shipped with the engine like the font and the
  logos.

- The menu background video is a recording of that same backdrop, so the
  machine with no GPU sees what everybody else draws instead of a
  different intro and a different grid.  util/renderMenuVideo.py makes it:
  a headless Singe draws Singe/Backdrop.singe on a virtual clock that
  moves a fixed number of milliseconds a frame, shoots every one of them,
  and the frames become assets/menuBackground.mkv.  Nothing in the script
  knows how long the intro runs or how fast the grid moves -- it asks the
  backdrop, which is the only way the recording and the drawing cannot
  drift apart -- and it stops after a whole number of turns of the grid,
  so the tail the menu plays over and over meets itself exactly.  The two
  clips the old video was cut from are gone, one of which nobody could
  account for.

- The menu has a sound.  util/makeMenuSound.py writes it -- every noise in
  it is an oscillator, a burst of noise or an envelope over one of the two,
  in a room that is a convolution with a tail of decaying noise, so there is
  nothing in it that cannot be accounted for either.  The charge, the rush
  of the logo arriving, the wingbeats (on the same curve the animation flaps
  to), the flame, and a riser as the grid comes up, over a bed whose four
  bars land exactly where the menu takes the screen.
  The charge and the flame are built the way the things themselves are
  heard rather than the way they are drawn.  Both were made of smooth
  envelopes over steady noise -- the flame of a band of noise wobbled by two
  sine waves, which is the textbook fake fire -- and nothing about either is
  smooth, steady or periodic.  The blast is now a crack, a slam through the
  middle of the bass (the band a small speaker turns into "loud", where the
  sub it had before moves no air at all), a drop that falls away twice over
  and is saturated so its harmonics carry the pitch a cabinet speaker cannot
  make, a body that flickers at random as its top closes, and rubble coming
  down after it;  the fire is a roar whose loudness wanders at random, a
  resonance that wanders with it, and the spitting inside it, all surging
  together.  Everything else ducks under the blast and comes back over a
  quarter of a second, because punch is contrast, and the limiter only bends
  the very top so the loudest moment keeps the shape it was given.  Then it fades out:  music under a menu waiting for someone
  to choose a game wears out its welcome, so the last seconds of the intro
  are the grid running on while the sound leaves, and nothing loops.  The
  The menu plays the file itself, over whichever renderer is drawing, so
  there is one copy of it:  muxing it into the recording as well would be
  the same nine seconds of sound shipped twice inside one binary.

- The dragon model is rigged.  util/objToGlb.py takes --pivots, a JSON
  naming where each object's own origin should sit, and moves the vertices
  so the node carries it back as a translation.  assets/DragonPivots.json
  gives the dragon its joints, so wingL turns at the shoulder and head at
  the top of the neck;  before, every part's node sat at the model's origin
  and turning a wing swung it around the middle of the animal.  The model
  looks identical -- no part moves by so much as a thousandth -- but it can
  now be animated without rigging it again in script each time.

- A game whose art is missing shows that it is missing, rather than taking
  the engine down with it.  An empty or wrong decorator path could open
  something that is not a file, report a nonsense length, and throw
  std::bad_alloc out of the GUI's texture loader -- a typo in a games.dat
  ended the program.  The loader now refuses an impossible size, and both
  menu renderers fall back to Singe/missing.png, drawn at build time, so a
  bad path reads as "MISSING art" instead of a hole in the page.

- GUIs and 2D particles no longer blink.  guiDraw and emitterDraw are
  documented as lasting one frame, meaning one onOverlayUpdate -- but their
  queues were emptied after every rendered frame, and the script's turn is
  throttled to FRAME_TICK_MS while the display refreshes as often as it
  can.  With a 3D scene enabled it refreshes continuously, so the GUIs and
  the 2D particles were drawn only on the frames the script happened to run
  on:  in the menu, a game list flickering over a grid that did not.  The
  queues are emptied when the script gets its turn instead.

- The menu shows packed games properly.  A .game is a database the engine
  presents through the VFS, so lfs.attributes reports it as a directory,
  not a file -- and the menu tested the mode before the extension, so every
  container went down the loose-directory branch and its games.dat was
  loaded with no container recorded.  Every CABINET, MARQUEE and ATTRACT
  path in it then named a file that exists only inside the database:  a
  library of .game files showed no art at all and died with "Unable to
  open" on the first attract video.  The extension is tested first now.
  Games packed with earlier releases are correct and do not need repacking.

- A lone .m2v played with --framefile now finds the .ogg beside it, as a
  framefile's segments always have.  A Daphne era elementary stream
  carries no audio of its own, so lair.m2v played silently unless it was
  listed in a framefile or --altaudio was given.  Any other container
  keeps using the audio inside it.

- A single-frame image saved as a 1-bit PNG (many overlay assets from
  the 2.x era) loads again; spriteLoad reported "Blit combination not
  supported" on it.  Images with 16 bits per channel or floating point
  pixels (16-bit PNGs among them) load as sprites, animation frames and
  particle textures; they ended the program.

- lfs.dir(".") and other names for the root work inside a packed game;
  they were refused as if the directory did not exist.

- --sindengun and --scalefactor are listed in --help and the manual;
  they were hidden because mouse positions ignored the Sinden border and
  the overscan shrink.  Positions now map into the picture actually
  drawn, so a light gun lands where it points inside the border.  The
  border is drawn the right way round (black ring outside, white ring
  inside, the game in the middle); one too wide for the video ends the
  program with a message instead of a zero-sized game; and light guns
  and tablets reporting absolute positions through ManyMouse are mapped
  into the picture like the mouse.

- The manual's 3D Scenes, Physics and Particles chapters are rewritten as
  sections in a learning order with worked examples, every reference
  entry now shows each form the call accepts with a realistic example,
  and prose spelling is American throughout.  Manual.pdf and Manual.html
  are rendered into .builddir/ by the build and by build-docs.sh alike,
  and the binary embeds the PDF from there.

- controllerGetButton() never worked; it rejected every framework button
  code.

- The five argument form of spriteDraw() always failed.

- spriteSetFrame() on a still image crashed.

- Unloading the selected font left later fontPrint() calls using freed
  memory.

- overlayCircle() drew around the origin instead of the requested center.

- overlaySetResolution() broke mouse coordinates and vldpGetPixel() because
  the overlay scale was computed with integer division.

- mouseGetPosition() always returned 0,0 and controllerGetAxis() read the
  wrong controller because the axis cache was indexed two different ways.

- Analog stick release events fired with a stale input code.  Controllers
  that were unplugged and replugged shifted their codes.

- The -o/--audio option was lost when the configuration was copied.

- --option=value forms of numeric options, and options after the script
  name, were not accepted.

- Running "singe game.singe" from the game's own directory wrote its data
  to the filesystem root.

- Framefile playback never advanced past the first segment, and switching
  segments dropped the selected audio track.

- Video timing accumulated main loop latency, drifting behind the audio.
  Audio is now the master clock:  the picture follows the samples the sound
  device has actually consumed, so the two cannot drift apart and the
  mixer's buffering latency is accounted for.  Silent videos follow the wall
  clock.  The first frame after a seek was shown one update late.

- Video without an audio track crashed on the first update.

- The video audio stream was shared with the mixer thread without a lock.

- onSoundCompleted was called from the audio thread.  It is now delivered
  from the game loop.

- Screenshots read the frame buffer through the window surface, which SDL
  forbids alongside a renderer, and could corrupt memory on shutdown.

- .patch archives crashed the installer.  Archives without an explicit top
  level directory entry were rejected.  Extraction now refuses paths that
  escape the installation directory.

- The Sinden gun arguments could overflow the configuration structure.

- Support files in the Singe directory are refreshed when the installed
  copy differs from the running build.  Upgrading the binary used to keep
  the old Framework.singe and Menu.singe forever.

- Lua reads a packed game where it lies.  Its file handle is a C FILE * and
  a database row is not a file, so anything a script opened by name inside
  a .game was written out to data/<game>/cache first and the copy opened
  instead -- a second copy of the game on disk, made a file at a time.
  Everything else in the engine had long since stopped needing that:  the
  sprite loader, the decoders and the GUI's file interface all read a row
  as a stream.  Only Lua could not, because the io library is not ours.
  It is patched now rather than worked around:  io.open, io.lines and
  io.input hand back a handle of Singe's own for a name that lives only in
  the database, and it reads through the same stream everything else uses.
  It answers to every method and format Lua's does, io.type calls it a
  file, io.read and io.close take it, and it closes itself on collection or
  on leaving a <close> variable's scope;  writing to it is an error, which
  is what a packed asset is.  testScripts/packedIo holds all of that to
  Lua's own behaviour.  With the last reader of the cache gone, the cache
  itself is gone:  vfsFilePath answers with a path only when there is a
  real file, and a packed name being read is asked for as a stream.

- The menu no longer unpacks a library's artwork to look at it.  It asked
  whether each picture was there by opening it, and io.open has to hand Lua
  a file the C library can read, so every cabinet and marquee in a packed
  library was written out to data/<game>/cache first -- none of which was
  ever opened that way:  spriteLoad and the document's texture loader both
  read straight out of the database.  The question is asked of the index
  now, through lfs.attributes, which opens nothing.  The cache remains for
  what it is for:  a game's own script opening its own files by name.

- A packed game writes to one data directory.  Everything that named a file
  inside a .game by a path that passes through it -- a script opening one
  of its own videos, which is how the menu loads an attract clip -- got a
  data directory named after the container including the extension, while
  the container itself, and everything else the same game wrote, used the
  name without it.  A library of packed games therefore grew two data
  directories each:  the video indexes in one and the saves, the overlay
  and the cache in the other.  Any component naming a database is reduced
  to its stem now, so both land in the same place.  An installation that
  has both may delete the ".game" one;  what was in it is rebuilt.

- Both menus scroll their details.  When a games.dat entry has more to say
  than fits, the text walks down by itself a line at a time, rests, and
  walks back up to the start rather than jumping there:  up and down belong
  to the library, and a cabinet has no key to spare for scrolling a
  paragraph.  The document renderer's description box had a scroll bar the
  style sheet gave it and nothing to drive it with;  the overlay renderer
  clipped and left it at that.  Page up and page down override the walk for
  whoever does have a keyboard, and it carries on from where they leave it.
  Both menus say so along the bottom.

- The overlay menu -- the one a machine with no GPU gets -- shows what a
  games.dat says about a game.  Its details had the attract video's column
  and whatever height was left under it, which at 720x480 was four lines,
  so the description used most of them and every fact about the game fell
  off the bottom.  They run the full width now, under the artwork, with the
  short fields grouped onto shared lines the way the document renderer
  groups them and the description last rather than first.  Cabinet and
  marquee artwork is scaled to fit its region as well:  spriteDraw blits at
  the picture's own size, so art larger than the space allowed for it used
  to be drawn straight over whatever was beside it.

- The overlay menu says which key does what, along the bottom, as the
  document menu always has.  There was no way to learn that up and down
  move one game and left and right move a page except to be told.

- Left and right move a third of the library, or a screenful, whichever is
  smaller.  A page in a library of nine games was ten, so every press
  landed on the first game or the last and nothing between them could be
  reached that way at all.

- The menu's Start button is gone.  Nothing but a mouse could ever reach it
  -- the document takes no keyboard focus, and a cabinet has no pointer --
  and the line beside it already says which button starts a game.  Clicking
  a game's row still starts it.

- The menu background video carries a keyframe every half second, and the
  first frame of its looping section is one of them, so the menu's jumps
  into and around it are instant.  It has no audio track and is compressed
  harder than the clips it replaced -- flat colour with hard edges is easy
  to encode -- so what was 26 MB of source clips and 1.3 MB inside the
  binary is now 0.9 MB of picture and 1.1 MB of sound.

- Framefiles whose first line is a relative directory produced garbage
  video paths (the directory string was freed before use); a lone "." now
  means the framefile's own directory.

- A crash prints a backtrace to the console (Linux and macOS) so a report
  can say where it happened; run with --program and send trace.txt too.

- Mouse positions are delivered in the video's coordinates again (SDL3
  stopped scaling them for us), so crosshairs follow the pointer.

- os.clock() in scripts now returns wall time rather than processor time.
  Nearly every existing game times its input debounces and prompts with
  it; once the GPU decodes the video the engine mostly sleeps, and those
  timers ran seconds slow.  A game that wanted processor time is not
  known to exist.  This diverges from stock Lua and from other Singe
  runtimes; new code that must be portable should use singeGetTicks().

- A key or button still held when a game exits no longer counts as a
  press in the script that follows.  Confirming Exit in a game with
  button 1 used to relaunch it from the menu.

- Audio ran late by the device queue depth on most Linux audio servers:
  the clock assumed one mixer buffer of latency where PulseAudio and
  PipeWire hold several.  See the audio sync entry above.

- Windows builds now carry the icon and version resource, with the version
  number encoded correctly.

- The build no longer depends on lyx, upx, or xxd; embedded resources, the
  version header, and the manual are generated by CMake.  The manual is
  embedded again and extracted as Singe/Manual.pdf.

- The licence Singe is under and the notices its libraries and assets
  require are embedded and extracted as Singe/COPYING and
  Singe/LICENSES, the way the manual is.  Nothing in the build copied
  them beside the binary, so a download carried the program without the
  terms it is offered under.

- One command builds Singe from a clean checkout on a Debian based
  system:  ./build-all.sh <platform> <arch> installs the host packages,
  then CMake fetches zig (the compiler for every target), the Pi's
  platform packages and the macOS SDK into .builddir/toolchains and
  builds every library and Singe itself.  The results are a Linux binary
  that runs on glibc 2.28 or newer, a Windows 10 or newer binary, a
  64-bit Raspberry Pi OS (bullseye or newer) binary and a macOS 13 or
  newer universal (Apple silicon and Intel) binary.  The toolchains repository is no longer
  needed.  See INSTALL.
- On a plain video disc, discSearch, discSkipToFrame, discSkipForward,
  discSkipBackward, discStepForward and discStepBackward clamp at the
  first and last frame instead of wrapping around the disc.
  discStepForward and discStepBackward are ignored while the disc is
  stopped, like the skips; they used to move the frame behind the blue
  screen.  On a framefile the skips apply to the frame number
  discGetFrame reports, so a skip in any segment after the first lands
  where it should.

- Every collision and trigger event of a frame reaches onCollision and
  onTrigger; only the first 64 used to, the rest were dropped.
  onTrigger fires once per body and trigger pair even when a mesh or
  compound shape touches in several places.  playerJump is granted
  whenever the player is on the ground.

- playerSetEnabled(node, false) removes the player's body from the
  world and reports it leaving every trigger it stood in; enabling puts
  it back.  navPath ends a partial path at the last reachable point.
  navLoad rejects data that is not a Detour mesh, or a file shorter
  than the mesh its header describes ("the navigation mesh file is
  truncated or damaged").  The world holds at most 4096 bodies; bodyNew
  raises an error when it is full.

- A body, player, ragdoll, soft body or vehicle whose node was deleted
  is released at the start of the next frame, disabled, inactive, static
  or paused or not; a disabled player or an inactive ragdoll on a deleted
  node kept its slot (16 players, 8 ragdolls) forever.  playerExists,
  softExists, ragdollExists, vehicleExists and every setter answer false
  for a node handle that was deleted and reused instead of driving the
  previous owner's record.  bodySetTrigger(node, false) no longer
  swallows the leave of a trigger the node is standing in.
  physicsSetDebug's mask is cleared by a reload.

- Sprite nodes are no longer culled early at the edge of the view, and
  shadow fitting sees their real size.  Soft particles fade correctly in
  a scene with no meshes instead of against stale depth.  Point-light
  shadows update when a caster's mesh is rewritten (soft bodies), given
  morph targets, or swapped with nodeSetMesh at an unchanged transform;
  the six cached faces could freeze in the old shape.  Cascaded sun
  shadows appear in render-to-texture views (viewNew) instead of
  vanishing; a view takes the finest cascade that covers each point.
  Debug lines no longer pile up while the scene layer is enabled but has
  no target.

- modelLoad refuses a skin with more than 128 joints or a skinned mesh
  naming a joint numbered 128 or more (the shader used to read past the
  matrices); a joint beyond the skins that use the mesh is traced and the
  load goes on, so a mesh shared by skins of different sizes loads.  A
  texture that cannot be decoded, or a missing KTX2 image, is traced and
  the load goes on without it instead of leaving modelLastError set.
  KHR_materials_emissive_strength is applied.  Sparse accessors load,
  animation keyframes included, so Blender shape keys are no longer
  silently zero; a sampler that cannot be read is traced and skipped,
  and a rotation channel with a malformed output no longer produces NaN
  transforms.  Alpha MASK materials, textures on TEXCOORD_1 and up, and
  KHR_texture_transform are traced as unsupported.

- After a script reload, or any stall longer than a tenth of a second,
  model animations advance by at most a tenth of a second instead of the
  whole gap; a non-looping clip used to be finished before its first
  frame.  A 3D emitter whose node is deleted is removed even when the
  handle is reused by a later nodeNew; it used to jump to the new node.

- Video index files are named <name>-<hash>.index, the hash from the
  video's full name, so two videos with one base name in a game stop
  rebuilding each other's index.  Old <name>.index files are ignored and
  can be deleted.

- The packer reports every forbidden file in a directory rather than
  stopping at the first.  --unpack refuses a database whose stored names
  would land outside the target directory.  Launching a .game database
  from the command line no longer crashes.

- --stretch hands the script mouse positions in the game's coordinates
  at any window size.  --scalefactor with --sindengun shrinks the picture
  inside the Sinden border instead of being cancelled by it.  A negative
  --audio track number is ignored.  With no --datadir the controls.cfg
  beside the script is read once, not twice.

- A reload (F5, --reload, singeReload) ignores keys and buttons held
  across it until they are released, resets the effect channels and their
  pending onSoundCompleted queue, the held switches and the 2D particle
  textures, restores the effects volume, mouse mode, mouse enabled state
  and mouse capture, parks the disc on frame 1 paused, and no longer
  calls into the closed Lua state when it happens while paused, so the
  new script starts exactly as a fresh launch does.  Under --reload a
  script that fails to compile stays watched, so saving the fix triggers
  the reload.

- Quitting with a stick past its dead zone no longer crashes; the
  release reaches onInputReleased after onShutdown, before the state
  closes.  Plugging in a gamepad no longer resets the positions
  mouseGetPosition reports, and a controls.cfg mapping that lists the
  same code twice fires its switch once.

- materialSetVideo(material) on a framefile disc keeps showing the disc
  after a segment change.

- In a packed game the controls.cfg at the root of the data directory
  loads again, io.open(".") returns nil with a message instead of a
  handle whose first read fails, and a directory listing where a loose
  file and a packed one differ only in case shows the loose spelling.

- Error messages:  an invalid view, navigation mesh or navigation agent
  handle reports "No <thing> N." like every other handle; navAgentNew,
  vehicleSetGears and viewNew state their limits from the engine's
  constants; fontLoad and soundLoad of a missing file say "Unable to open
  NAME" instead of the library's "invalid parameter"; navDraw reports its
  argument count, and running out of memory in it is an error rather than
  a silent blank; scriptExecute and scriptPush that cannot create the new
  data directory abort the script with a message instead of exiting.
  materialNew, sceneGetSize and sceneGetStats no longer reject extra
  arguments.

- A review of the week's work (the io patch, the scheduler, Forge, the
  menu, the GLES backend, saves and the GUI) fixed what it found:

  Lua's io on a packed asset:  f:lines and io.lines with more than one
  format handed back only the last value read a step;  a later format
  that comes up empty now returns what came before it with nil in its
  place, as Lua does, and only an empty first read ends the loop.
  read("a") reads in blocks rather than a byte at a time, read(0) is the
  end-of-file test it is in Lua, and a NUL byte is no longer taken for
  part of a number.  testScripts/packedIo covers all of it.

  Timer and tween handles carry a generation:  a handle kept past its
  timer's end no longer cancels, or answers for, whatever timer was
  given the same slot afterwards.

  Forge:  a rule's keyHeld condition never fired from a real keyboard
  (it compared a key name against the scancodes the engine delivers);
  an entity whose look kind is unknown is drawn as a box with a message
  instead of ending the game;  and the compiler loads the runtime from
  Forge/, where it lives, rather than a Singe/Author.singe that was never
  shipped.  The games.dat Forge writes no longer carries a DATA key the
  engine does not read, and the manual's example loses it too.

  The menu:  a games.dat entry with no ATTRACT clip no longer stops the
  engine on either renderer, quitting with no games listed no longer
  fails in onShutdown, and a directory entry lfs cannot describe is
  skipped rather than indexed.

  The GLES backend freed nothing when its framebuffer cache filled and
  was reset;  the framebuffer objects go now.  A save is written with a
  single atomic rename everywhere but Windows, so the old save stays
  whole until the new one is in place.  A GUI texture decoded with a
  padded pitch is packed row by row instead of uploaded with its padding
  read as pixels.  The menu's backdrop stops rewriting its grid colours
  every frame once the grid is lit.

  Net.singe verified a connection against Linux's CA list by path, so
  without a pin every HTTPS request failed on Windows, macOS and the
  handhelds.  The engine now extracts Mozilla's CA list as
  Singe/cacerts.pem with the other support files and Net.singe uses it
  wherever the platform's own list is missing.  A chunked response --
  what an HTTP/1.1 server sends when it does not know the length -- is
  unwrapped as it arrives rather than handed to the caller with the chunk
  sizes still in it.  And a mistyped value in a table given to scriptPush
  or scriptExecute is reported like any other bad API argument -- the
  script line and the call named -- rather than as a bare exit message.

- Forge has its own manual, docs/Forge.adoc, built to Forge.html and
  Forge.pdf beside the Singe manual;  the engine's manual keeps a pointer.
  The build packs Forge.game itself, with the manual inside, and Forge's
  first run copies Forge.pdf out to its data directory and says where.
  R redoes what U undid, forty steps deep.



SINGE 2.10
==========

  Released March 26th, 2024


New Features
------------

- Texture samplers now walk the whole mipmap chain.  SDL hands max_lod
  straight to Vulkan's maxLod and Direct3D 12's MaxLOD, and the scene
  and GUI left it at the zero a memset gives, which clamps every lookup
  to mip level 0.  Mipmapping was therefore off on every backend:
  distant surfaces aliased, the 8x anisotropy did far less than it
  looked, and the sky cube could not pick a level by roughness.

- An OpenGL ES 3.1 backend for the 3D scene and the GUI.  SDL_GPU has
  Vulkan, Direct3D 12 and Metal and no OpenGL of any kind, which left the
  cheap Linux handhelds and the Raspberry Pi with 2D only:  their Mali and
  VideoCore parts have a mature GLES driver and either no Vulkan or an
  immature one.  The subset of SDL_GPU the scene and the GUI use is now
  behind one table of function pointers with two implementations, so both
  files stay the single description of what Singe draws, and the backend is
  chosen at run time -- one aarch64 binary serves a board with Vulkan and one
  without.  The ES shaders come from the same HLSL through SPIRV-Cross, and
  the GL entry points are loaded through SDL rather than linked, so a machine
  with no GLES driver simply keeps its 2D renderer.  The Raspberry Pi 4
  remains the minimum for 3D:  the Pi 3 has only OpenGL ES 2.0, which cannot
  express the scene's skinning or morph targets.

- spriteDraw() now has two more forms.  In addition to being able to draw
  regular sprites and stretched sprites it can now draw both using the
  sprite's center as the anchor instead of the upper left.  This is highly
  useful when dealing with rotated sprites.

- Animated sprites!  Both animated GIF and WEBP images are supported.

- Sprite anti-aliasing, scaling and rotation!  Optional separate X & Y scaling.

- Video anti-aliasing, scaling and rotation!  Optional separate X & Y scaling.

- Multiple audio track support for videos.  New command line options to select
  which default audio track you want (-o or --audio).  For games with multiple
  languages, you can specify AUDIO_TRACK in the games.dat as well.

- New keyboard methods to make handling input easier, especially multiple
  keypresses for diagonal movement.

- controllerGetButton() added.

- SINGE_DEAD_ZONE global variable now available based on the DEAD_ZONE
  controller configuration option.

- SINGE_FRAMEWORK_VERSION variable added.

- DIR variable added providing directory to the running script.

- All new Lua library handling.  Previously Singe "injected" libraries
  directly into the script context.  Now there is a proper Lua module search
  handler.  Scripts can properly require() modules from the following:
    - Lua Standard Library
    - Lua Auxiliary Library
    - LuaFileSystem
    - LuaSocket
    - LuaSec
    - LuaRS232
    - timerwheel
    - binaryheap
    - Copas
    - json

- New command line option:  -p (or --program).  This is similar to the
  existing -t (or --trace) option.  Where "trace" displays and logs script
  execution, "program" displays and logs Singe internals.  This should make
  troubleshooting difficult setups and odd script crashes easier.

- Auto-installer for the new GAME, TOOL, and PATCH archive formats to make
  managing games easier.

- ZeroBrane Studio (https://studio.zerobrane.com) integration for live
  debugging of running Singe scripts!  A full IDE for developing games!


Fixes
-----

- USB controllers now work in games launched from the included menu.

- Default controller DEAD_ZONE increased.

- Framework.singe was missing keyboard mode constants.  MODE_NORMAL and
  MODE_FULL are now included.

- SINGE 2.00 added two new input events but never had them in the framework.
  SWITCH_BUTTON4 and SWITCH_TILT are now available.

- Taking screenshots could sometimes crash Singe.

- PNG files no longer generate warnings on the console.

- Non-VLDP videos now honor command line volume settings.

- Menu system now performs "natural sorting" of game titles instead of brain
  dead "computer sorting".  It should make a lot more sense paging through
  games now.

- Building Singe depended on a lot of undocumented software cobbled together
  from other projects.  This has been vastly improved and should be usable by
  actual humans now.  Humans running Linux anyway.


------------------------------------------------------------------------------


SINGE 2.00
==========

  Released October 25th, 2020


New Features
------------

- Complete rewrite!  No more dependency on Daphne.

- Support for almost every (non-patent encumbered) video and audio format
  that can be played by FFMPEG.

- High definition video.

- 32 bit color.

- Additional videos can be played on top the laserdisc video.

- Scaled sprites.

- Graphics overlay resolution no longer dependent on video resolution.

- Analog controllers.

- LuaSocket and LuaFileSystem added to runtime.

- Ability to chain scripts together for menus or launchers.

- Specify if you want gun games to display on-screen crosshairs or not.

- Menu for launching games included.

- Many updates to Framework.singe to support the new APIs.

- New APIs:
  - controllerGetAxis
  - discGetHeight
  - discGetWidth
  - fontUnload
  - mouseGetPosition
  - mouseSetCaptured
  - overlayBox
  - overlayCircle
  - overlayEllipse
  - overlayLine
  - overlayPlot
  - overlaySetResolution
  - scriptExecute
  - scriptPush
  - singeWantsCrosshairs
  - soundUnload
  - spriteGetHeight
  - spriteGetWidth
  - spriteUnload
  - videoDraw
  - videoGetFrame
  - videoGetFrameCount
  - videoGetHeight
  - videoGetVolume
  - videoGetWidth
  - videoIsPlaying
  - videoLoad
  - videoPause
  - videoPlay
  - videoSeek
  - videoSetVolume
  - videoUnload


------------------------------------------------------------------------------


SINGE 1.14 - 1.19
=================

  Released ?


Notes
-----

- Unofficial fan builds.
- Stand-alone releases.


New Features
------------

- New API functions:
  - discPauseAtFrame
  - mouseEnable
  - mouseDisable
  - mouseHowMany
  - mouseSetMode
  - singeDisablePauseKey
  - singeEnablePauseKey
  - singeGetScriptPath
  - singeSetGameName
  - soundFullStop
  - soundGetVolume
  - soundIsPlaying
  - soundPause
  - soundResume


------------------------------------------------------------------------------


SINGE 1.10 - 1.14
=================

  Released ?


Notes
-----

- Unofficial fan builds.
- DLL releases for Daphne.


New Features
------------

- New API functions:
  - discGetState
  - keyboardGetMode
  - keyboardSetMode
  - singeGetPauseFlag
  - singeSetPauseFlag
  - singeQuit
  - singeVersion
  - soundStop


------------------------------------------------------------------------------


SINGE 1.00
==========

  Released 2006


Notes
-----

- Original add-on for Daphne.
- Shipped with the ActionMax "emulator" and games.