SamandClaude Fable 5
2ad0043523
A from-scratch World of Warcraft 1.12.1 client in Rust + Bevy. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
29 lines
1.4 KiB
WebGPU Shading Language
29 lines
1.4 KiB
WebGPU Shading Language
// The UI gamma lane's ONE decode (decision 0254) — the twin of `ffx_glow.wgsl`'s combine, which owns
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// the world lane's single decode (0161).
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//
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// `ui_quad.wgsl` composites the whole UI in gamma bytes, like the reference's fixed-function
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// backbuffer. The UI camera's target is `Rgba8UnormSrgb`, so a stored byte round-trips through the
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// hardware's encode/decode and the sampler hands this pass back the gamma value the UI pass wrote.
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// Emitting `srgb_to_linear` of it re-encodes on write to the exact client byte, which the output
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// blit then carries into the swapchain unchanged.
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//
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// RGB is premultiplied by coverage; alpha is coverage and carries no gamma, so it passes through.
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#import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput
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@group(0) @binding(0) var screen_texture: texture_2d<f32>;
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@group(0) @binding(1) var screen_sampler: sampler;
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// sRGB → linear (IEC 61966-2-1), the exact inverse of `ui_quad.wgsl`'s `linear_to_srgb`.
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fn srgb_to_linear(c: vec3<f32>) -> vec3<f32> {
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let higher = pow((max(c, vec3<f32>(0.0)) + vec3<f32>(0.055)) / 1.055, vec3<f32>(2.4));
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let lower = c / 12.92;
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return select(higher, lower, c <= vec3<f32>(0.04045));
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}
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@fragment
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fn fs_decode(in: FullscreenVertexOutput) -> @location(0) vec4<f32> {
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let ui = textureSample(screen_texture, screen_sampler, in.uv);
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return vec4<f32>(srgb_to_linear(ui.rgb), ui.a);
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}
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