[monsterlag]

Refs #1116, reported by @AL-33.

When SDL cannot load, initialize, or create a window, Hookshot can continue invisibly with audio. A failed window creation starts an offscreen renderer and sleeps indefinitely. Return a distinct initialization error and exit with status 1 after logging and flushing the diagnostic. All three failures also print their reason to stderr. Explicit HOS_HEADLESS and successful visible startup retain their behavior.

Shader preparation remains usable without SDL or a display: the POSIX entry point recognizes --prepare-shaders before display initialization, then lets the preparation worker finish or report its existing no-Vulkan exit 3. Values supplied to --romfs and --user are skipped when identifying that flag.

The report identifies a missing libvulkan.so.1. Supplying that dependency and NixOS packaging remain separate work.

Validation on 8a72a7d, merged with upstream 7dbdcdc:

• All 11 fixture cases pass with Windows LLVM-MinGW and Linux GCC under -Wall -Wextra -Werror. The focused strict runner passes with zero failures or skips.
• Before the review correction, the three stderr checks and both preparation checks fail; the four original controls pass. The final cases also cover both path values equal to --prepare-shaders.
• The original three failure paths were separately demonstrated failing against original main 8b2e1d3.
• The PR diff passes whitespace checks. All eight hosted validation checks pass for this head; release publishing is skipped for the PR.

The fixture extracts the production initialization/start functions and POSIX entry point, plus the display loop's window-startup prefix. SDL, threading, renderer and termination are authored stubs; preparation worker success and exit 3 are authored outcomes. Real SDL/NixOS execution, Vulkan shader preparation, event/render processing and actual thread concurrency remain untested by this fixture. No game data is included.

[NotRexed]

This landed in the v2.0.12 branch (merged there for testing; it reaches main with that release), so closing. Thanks!

[NotRexed]

Reopened: closing this was a mistake on my side. It was tested in the v2.0.12 branch, and it will be merged into main here, so it shows as merged. Sorry for the noise.