TiXL Meetup 2026-10-05 / The Linux & Vulkan Port, Time & Beat Sync, Projector Calibration

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A 4h23m TiXL developer meet-up: the first long look at the Linux port — SDL instead of WinForms, a thin facade carrying the old SharpDX calls to Vulkan 1.3, existing HLSL compiled through slang to SPIR-V, and 90 of 100 visual reference tests passing natively on Arch — then a community half on how bars and external clocks drive time, render-target economics, a photo-based projector calibration, and screen-space derivatives for anti-aliased field edges.

🆕 new feature · 🛠️ improvement · 📘 operator · 📝 walkthrough · 🧠 deep dive · 🍿 showcase · 🎯 planned · 💬 discussion · ⚠️ heads-up

Chapters

• 0:00 💬 Welcome: the release calendar and what v4.3 needs
• 4:05 🎯 Why the free time goes into the Linux port
• 9:06 ⚠️ AbletonLinkSync only reaches the branch it feeds
• 14:33 📝 A title card (Text, FastBlur, LinearGradient, Steps)
• 17:48 📝 Output setup: a central output onto a display
• 22:12 📝 Two patches splitting one monitor
• 25:30 🎯 Panels in own windows, and a hot-standby machine
• 33:12 🧠 Whiteboard: WinForms, SharpDX, ImGui and Bass
• 37:25 🆕 SDL replaces WinForms; a facade onto Vulkan 1.3
• 40:07 📝 The player first: 90 of 100 visual tests pass
• 44:37 🆕 HLSL survives: slang compiles it to SPIR-V
• 46:55 🎯 No TiXL 5 break, and what slang's strictness costs
• 52:06 🆕 The linux-port branch, tag 4.4 and build actions
• 57:33 🍿 Live on Arch: dotnet build, 2s startup, tests
• 1:05:58 ⚠️ NDI's license blocks packages; audio via PipeWire
• 1:09:56 🍿 The ImGui UI, image export and drag-and-drop work
• 1:12:12 💬 How to help: crashes, shader errors, feature tests
• 1:16:40 ⚠️ Wayland only, and SVG moving to Skia everywhere
• 1:22:45 💬 Why Linux: Windows fatigue, plus Pi and ARM
• 1:35:21 🧠 Time is bars, not seconds — and external clocks
• 1:38:24 📝 A clock from RadialPoints, with AnimValue kicks
• 1:42:42 📘 Seconds not bars: SetTime and SetPlaybackTime
• 1:54:47 🧠 No route node: portals and pull-based evaluation
• 2:01:33 💬 One voice per note, and C# delegates as the answer
• 2:10:25 🎯 PBR roadmap: reflections, cube maps, variations
• 2:13:49 🧠 Why the renderer stays forward: MSAA, über-shaders
• 2:19:00 🍿 A vibe-coded reroute point, Houdini-style
• 2:30:21 ⚠️ A deleted central output leaves a ghost
• 2:42:39 🧠 Focus-loss frame drops, and the performance graph
• 2:55:30 🛠️ Untick update on unused outputs; keystoning
• 3:02:22 📝 Tracing a reference photo and straightening it
• 3:08:13 🍿 Calibrating by dragging markers onto the wall
• 3:17:00 🛠️ Render targets by the pixel; tone mapping late
• 3:24:03 📝 The texture-info overlay and render-target wins
• 3:29:22 ⚠️ A 0×0 source stretches DrawBillboards
• 3:38:22 📘 Layer2d snapping, RemapColor, publishing an input
• 3:46:56 🛠️ "Paste values", and Ctrl+F as a history list
• 3:53:13 📝 CustomDrawMesh: flat and lit mixed by a dot product
• 4:05:24 📝 A gradient from field distance, and alpha cutoff
• 4:09:34 🧠 Screen-space derivatives: ddx, ddy and fwidth
• 4:14:00 🍿 fwidth as a smooth-step width — free anti-aliasing
• 4:22:23 💬 Wrap-up: test Linux, test the output system