compute_particle_update

Reference compute shader for GPU particle simulation. Each particle is 8 floats [px, py, pz, life, vx, vy, vz, age]; the shader applies velocity, gravity, and aging every frame — thousands of particles updated entirely on the GPU.

Bindings (see bindings.yaml): particles (read_write array<f32>), params (read_write array<f32> — [dt, gravity_y, damping, pad]).

damping is the fraction of velocity a particle keeps per 60th of a second, so the same value produces the same motion whatever rate the shader is dispatched at: 0.98 keeps 98% of the velocity every 1/60 s at 30 fps and at 144 fps alike.

Usage: dispatch by identity — it resolves to the shader's stable guid and auto-compiles on first use (no setup): compute.dispatch("@builtin::shaders.compute_particle_update", { buffers = { "particles", "params" }, workgroups = { math.ceil(count / 64), 1, 1 } }).