5DO 1.3.0

5DO 1.3.0

Release date: 2026-11-06
Status: Presentation feature update on the 1.2.2 performance/library release.

Highlights

• 480i/240p field handling. Interlaced titles can now be presented with correct
  field handling instead of showing one field as a full frame. Settings > Video exposes
  four modes:
  • Auto detects complementary fields and weaves them (desktop default).
  • Bob presents each field unchanged (the historical behavior and CLI default).
  • Weave always combines two fields into a 480-line (PAL 576-line) frame.
  • Blend averages consecutive fields into one flicker-free 240-line frame.
• Content-based detection. Auto compares same-index rows in adjacent fields with
  the vertical difference inside the current field. Progressive 240p content repeats the
  same row in both fields, so its temporal difference is near zero; interlaced content
  puts an adjacent source row in each field. A verdict must persist for 12 fields before
  weaving starts and 30 progressive fields before it stops. Explicit modes and per-game
  profiles override detection when a title still combs or flickers.
• Correct presentation geometry. Woven frames carry a half-height pixel aspect, so
  the OpenGL, Vulkan, Direct3D 11, and CPU presenters keep the source display geometry
  and apply integer scaling in display space. PAL 288-line fields weave to 576 lines.
• Screenshots, GIFs, and automation. Screenshots and GIF recording capture the
  presented frame. GIFs rescale a mid-recording 240↔480 change instead of dropping
  frames. --deinterlace auto|bob|weave|blend selects the mode in run and trace, and
  run --json reports deinterlace, interlaced, and interlaceDetected.
• No 240p regression. The CLI and emulation core default to bob. On 2026-11-06,
  3,000-frame bob-vs-auto runs of Road Rash, Space Ace, and Alone in the Dark produced
  identical hashes, as did 300-frame runs of Wolfenstein 3D and Lemmings.

Changed

• GIF recording now keeps its initial canvas size and rescales frames whose dimensions
  change, rather than skipping every frame after a field-mode switch.
• Per-game profiles include the field-handling mode; older profiles leave the global
  setting unchanged.

Requirements

• The .NET 10 Runtime installed on the host. The bundles are framework-dependent and
  do not include the runtime. Choose the x64 or arm64 bundle that matches your OS.
• A legally obtained 1 MB 3DO BIOS ROM (for example panafz1.bin).
• Legally obtained 3DO disc images in ISO, BIN, CUE+BIN, or CHD format.

Download

System	Bundle
Windows x64	5do-1.3.0-win-x64.zip
Windows arm64	5do-1.3.0-win-arm64.zip
Linux x64	5do-1.3.0-linux-x64.tar.gz
Linux arm64	5do-1.3.0-linux-arm64.tar.gz
macOS x64	5do-1.3.0-osx-x64.tar.gz
macOS arm64	5do-1.3.0-osx-arm64.tar.gz

Each bundle contains the framework-dependent single-file CLI and desktop app, the
README/license/notices, whatsnew.md, and the legal/release docs. SHA256SUMS.txt is
attached to the GitHub release.

Known limits

• Auto is a content heuristic, not a hardware mode bit. No local title is confirmed
  480i, so the synthetic complementary-field tests are the current 480i evidence.
  Explicit weave/blend modes and per-game profiles are available.
• A woven capture is stored at 320x480 (PAL 320x576) with half-height pixels. Viewers
  that assume square pixels will show it taller than 4:3; the presenters apply
  VdlFrame.PixelAspect correctly.
• The opt-in 640x480 high-resolution mode is already progressive line-doubled output and
  ignores weave/blend.
• Emulation accuracy, compatibility, and save-state behavior are unchanged from 1.2.2.

Validation

• Full suite: 1,833/1,833 passing in Debug and Release.
• dotnet format --verify-no-changes clean.
• jb inspectcode --severity=WARNING: no warnings in changed files; the remaining
  warnings are pre-existing in Arm60.Jit.cs and StateWriter.cs.
• Frontend --smoke-test passed.
• Forced weave produced a 320x480 frame on Road Rash; forced blend stayed at 320x240;
  high-resolution Lemmings stayed at 640x480 under both modes.

See Video.md section 1 for the field-handling model and
ImplementationPlan.md for the backlog status.