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Translate shader bundles to WGSL at build time, behind an opt-in - #472
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Two actionable findings in the WGSL build path, covering named shader entry points and native build caching.
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isnan and isinf have no WGSL equivalent, so Tint rejects every shader that uses them. IEEE bit tests through floatBitsToUint work in every shading language, and fast math cannot fold them away.
Built from a pinned Dawn revision with the SPIR-V reader on, which Dawn's own prebuilt tint leaves off. A flutter_scene_tint-* tag builds it for macOS, Linux, and Windows and publishes the binaries with a sha256 manifest.
With flutter_scene_webgpu: true under hooks: user_defines:, shader bundles get a .wgsl.json sidecar beside them: each shader's Vulkan SPIR-V translated by the released flutter_scene_tint (downloaded and sha256-checked), its bindings verified, and the reflection it binds by. Constant arrays are hoisted before translation so Tint does not copy them per use. Off by default, and nothing reads the sidecars yet.
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Stacked on #471.
Adds
flutter_scene_tint, a native SPIR-V to WGSL tool released from this repo (flutter_scene_tint-0.1.0), and a build-hook step that writes a.wgsl.jsonsidecar beside each shader bundle whenflutter_scene_webgpu: trueis set underhooks: user_defines:. Off by default and not read by anything yet; it is the input the WebGPU backend in the next PR loads. Also replaces the debug shader'sisnan/isinf, which WGSL cannot express, with bit tests.