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>
31 lines
1.7 KiB
WebGPU Shading Language
31 lines
1.7 KiB
WebGPU Shading Language
// WoW `alphaMode="ADD"` for Bevy UI — the glue highlight overlays (`ButtonHilight-Square`, the
|
|
// arrow/panel/scroll `Highlight`s, `UI-Common-MouseHilight`) draw with a TRUE additive blend
|
|
// state (set Rust-side in `AddUiMaterial::specialize`); this fragment only samples the authored
|
|
// sub-rect (uv min/max — the sheets store the button region in a corner/quarter).
|
|
//
|
|
// On the UI gamma composite lane (decision 0254) like its siblings `ui_node_gamma.wgsl` /
|
|
// `ui_slice_gamma.wgsl`: the texel goes back to the client's byte space, so the `SrcAlpha/One`
|
|
// blend state resolves to the reference's byte add `dst + texel·α` (EGxBlend 3 =
|
|
// `glBlendFunc(GL_SRC_ALPHA, GL_ONE)`; wow-re `system/gx/gx.md`). Emitting the linear texel instead
|
|
// would let the hardware add a linearised glow, landing every highlight's dim skirt at a different
|
|
// weight than the reference's — the same error 0160 caught for the world's additive sources.
|
|
#import bevy_ui::ui_vertex_output::UiVertexOutput
|
|
|
|
@group(1) @binding(0) var texture: texture_2d<f32>;
|
|
@group(1) @binding(1) var texture_sampler: sampler;
|
|
@group(1) @binding(2) var<uniform> rect: vec4<f32>;
|
|
|
|
// Linear → sRGB (IEC 61966-2-1) — the exact inverse of the sampler's sRGB decode.
|
|
fn linear_to_srgb(c: vec3<f32>) -> vec3<f32> {
|
|
let higher = 1.055 * pow(max(c, vec3<f32>(0.0)), vec3<f32>(1.0 / 2.4)) - 0.055;
|
|
let lower = c * 12.92;
|
|
return select(higher, lower, c <= vec3<f32>(0.0031308));
|
|
}
|
|
|
|
@fragment
|
|
fn fragment(in: UiVertexOutput) -> @location(0) vec4<f32> {
|
|
let uv = mix(rect.xy, rect.zw, in.uv);
|
|
let texel = textureSample(texture, texture_sampler, uv);
|
|
return vec4<f32>(linear_to_srgb(texel.rgb), texel.a);
|
|
}
|