xfy
6ccd0a173b
Adds BrightPassMaterial + brightpass.wgsl: extracts luminance above a soft-knee threshold from the HDR offscreen into a half-res Rgba16Float target (bloom_0). Camera order -19 (after offscreen at -20). The brightpass output is not yet composited (Task 6); this commit only adds the pass and confirms it runs without crashing.
24 lines
817 B
WebGPU Shading Language
24 lines
817 B
WebGPU Shading Language
#import bevy_sprite::mesh2d_vertex_output::VertexOutput
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struct BrightPassUniform {
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threshold: f32,
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_pad0: f32,
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_pad1: f32,
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_pad2: f32,
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};
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@group(#{MATERIAL_BIND_GROUP}) @binding(0) var<uniform> u: BrightPassUniform;
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@group(#{MATERIAL_BIND_GROUP}) @binding(1) var tex: texture_2d<f32>;
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@group(#{MATERIAL_BIND_GROUP}) @binding(2) var samp: sampler;
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@fragment
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fn fragment(in: VertexOutput) -> @location(0) vec4<f32> {
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let hdr = textureSample(tex, samp, in.uv).rgb;
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let lum = dot(hdr, vec3<f32>(0.2126, 0.7152, 0.0722));
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// Soft knee: smooth roll-off instead of a hard threshold cut.
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// Fully-bright passes through; near-threshold tapers to zero.
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let soft = max(lum - u.threshold, 0.0) / (lum + 0.0001);
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let contribution = hdr * soft;
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return vec4<f32>(contribution, 1.0);
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}
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