2026-07-22 18:09:06 +02:00
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//SPDX-License-Identifier: MIT
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//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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2026-06-16 14:12:12 +00:00
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// Issue #37: GPU producer (WebGPU) for the procedural AABB build input.
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// Writes the per-box bounding boxes straight into a device storage buffer
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// that Mesh::BuildProcedural / RefitProcedural then consume by handle, with
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// no host copy. Emits a single unit box [-r,r]^3 (the bounding volume the
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// intersection shader turns into a sphere); `time` lets it breathe so the
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// per-frame refit has something to track. A real particle system would write
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// one box per particle from simulation state.
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//
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// PlainComputeShader layout (no rayQuery → user groups start at 1):
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// @group(0) @binding(0) uniform Params
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// @group(1) @binding(0) storage read_write boxes : array<f32> (6 f32/box)
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struct Params { count: u32, time: f32, _0: u32, _1: u32 };
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@group(0) @binding(0) var<uniform> pc : Params;
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@group(1) @binding(0) var<storage, read_write> boxes : array<f32>;
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@compute @workgroup_size(64)
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fn main(@builtin(global_invocation_id) gid: vec3<u32>) {
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let i = gid.x;
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if (i >= pc.count) { return; }
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let r = 1.0 + 0.15 * sin(pc.time);
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let b = i * 6u;
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boxes[b + 0u] = -r;
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boxes[b + 1u] = -r;
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boxes[b + 2u] = -r;
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boxes[b + 3u] = r;
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boxes[b + 4u] = r;
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boxes[b + 5u] = r;
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}
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