Packs declare [[tags]] of block sprites (glass, say) and read them as
MaterialInput.tags; the frame gains precipitation, temperature, downfall
and wetness (rain smoothed as the shaders/ format's).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01XnU6QS9x9HatX1QRXMqxeb
A native pack named by HORIZON_SHADER_PACK (a folder with horizon-shaders.toml
or a .hshader in shaderpacks/) is checked, then its post passes run over the
world's own target, the one a shaders/ pack reads: no second target and no
extra pass, and without a pack the frame only tests one Option. The pack is
looked at twice a second; a saved file is checked and rebuilt in place, and a
version that fails is refused in the chat while the last good one keeps
drawing.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
horizon_shader_api::check builds each stage as the renderer does and judges
it the same way wherever it runs (the game, the launcher, the registry's CI,
the coming horizon-shader tool): naga parses and validates it; the stage
function must have its signature; the pack's files declare no bindings, no
entry points and no horizon_ names; each override is an option of its type or
has a default, and each option is used; a stage stays within 20 000
expressions and 64 texture reads; and every entry point translates to SPIR-V,
Metal and HLSL with the options at their defaults, minimums and maximums.
Problems carry the pack's own file, line and column. Pack::sha256 gives the
reproducible package's hash.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Three stages, each a WGSL function with a fixed signature that Horizon calls
inside its own pass: sky (fn sky(input: SkyInput) -> vec4<f32>), material
(fn material(input: MaterialInput) -> Surface) and post (fn post(input:
PostInput) -> vec4<f32>). A stage's WGSL is a generated prelude (the frame
uniform, the stage's structs, its resources in bind group 3, the post
helpers), the pack's shared files, its own file, then the entry points; each
part is located so errors point at the pack's file and line.
The frame is the Rust struct the renderer will upload; its WGSL, its offsets
and docs/api/shaders-reference.md are generated from it, and tests check that
the preludes compile, that naga's layout of the WGSL is the Rust layout, that
the sample pack's stages compile, and that the reference is up to date.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
