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feat(windows): Gl.* on Windows, through WGL and a driver-filled thunk table

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gl_win.ll creates a hidden-window WGL 4.1 core context and carries gl.ll's
float/memory helpers, with ldexp and QueryPerformanceCounter in place of the
libSystem calls. glgen now also writes gl_thunks_win.ll: the same 478 thunks,
calling through pointers that @lgl_win_load fills from wglGetProcAddress (and
opengl32.dll for GL 1.1). ludicc links the pair against opengl32/gdi32/user32
on a Windows target.

Verified: gl_api.ludic and gl_thunks.ll regenerate byte-identically, ludic-dev
test 135/135, selfhost-test 32/32, and headless gl_triangle on an RTX 3070 Ti
matches the macOS frame to within one level per channel.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-13 02:10:36 +03:00
parent 5801005fca
commit cb05721a89
6 changed files with 13177 additions and 301 deletions
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changes/windows-target.md
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@ -16,5 +16,11 @@ type: feat
- **The driver** — finds `C:\Program Files\LLVM\bin\clang.exe` when clang is not on
`%PATH%`, writes `.exe` outputs, speaks cmd.exe for its directory and cleanup commands,
and reads `argv[0]`, `%PATH%` and `$LUDIC_HOME` with either separator.
- **Not yet** — a window, `Gl.*`, `Audio.*` and `Http.*` are still macOS platform layers;
- **Not yet** — a window, `Audio.*` and `Http.*` are still macOS platform layers;
a Windows build that needs one stops with a message saying so.
- **`Gl.*` on Windows** — `gl_win.ll` makes a WGL 4.1 core context on a hidden window's DC,
and `gl_thunks_win.ll` (generated by `ludic-dev glgen` beside `gl_thunks.ll`) calls
every entry point through a table `@lgl_win_load` fills from `wglGetProcAddress`, falling
back to `opengl32.dll` for the 1.1 functions it will not return. A headless GL program
renders on the GPU there: `gl_triangle` matches the macOS frame to within one level per
channel.