xfy
5fa2621e6a
The whole-file #import "file.wgsl" form (without ::) does not reliably bring functions into scope in naga_oil/Bevy 0.19 — the renderer was failing at runtime with 'no definition in scope for identifier: ray_direction' (and rot_x, deriv, etc.), producing a blank screen despite 'cargo build' passing (shaders aren't compile-checked at build time). Fix: add #define_import_path to each module file and import symbols explicitly via namespace::name (the canonical Bevy pattern from the shader_material_2d example). Verified the full shader pipeline compiles and runs at runtime with zero WGSL errors. This was a pre-existing bug masked by incomplete runtime verification in earlier tasks; it is NOT specific to Task 15's grid work. All earlier visual features (shadow, Doppler disk, Einstein halo, stars, planets, grid) now actually render.
17 lines
773 B
WebGPU Shading Language
17 lines
773 B
WebGPU Shading Language
// Builds a world-space camera ray direction for the current pixel.
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// `uv` is the pixel coordinate normalized to [-1,1] with aspect correction.
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#define_import_path singularity::ray_gen
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fn ray_direction(uv: vec2<f32>) -> vec3<f32> {
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// NOTE: `fov` is packed into the `.w` of `up` in BlackHoleUniforms
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// (the Rust struct lays out `up: Vec3` + `fov: f32` as one vec4 block).
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// The WGSL struct must stay exactly as-is per the task spec, so read fov
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// from `uniforms.up.w` rather than a separate `uniforms.fov` field.
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let tan_half_fov = tan(uniforms.up.w * 0.5);
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let dir =
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normalize(uniforms.forward.xyz)
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+ uniforms.right.xyz * (uv.x * tan_half_fov)
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+ uniforms.up.xyz * (uv.y * tan_half_fov);
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return normalize(dir);
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}
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