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feat: air field, fans, and gunpowder shockwaves - #8
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Reserve ids 7–11 and lock fans like stone so the air pass can paint walls without them being overwritten by sand.
Run a 4×4 Eulerian pv/vx/vy step before particles so static fans keep blowing even when their chunk is idle.
Orthogonal fans sharing an air cell were composing because inject_fans only set the facing axis. Each fan now assigns both vx and vy so the last pixel in scan order fully wins the shared vector.
Steam and fire take one air-axis move before they rise so a fan in the same 4×4 can blow them sideways.
Gunpowder falls like sand and turns a 3×3 into fire, leaving stone and fans, so shockwaves have a source that is not the fan field.
Show fan flow on empty pixels and expose facing-cycle plus gunpowder on the palette without exporting air buffers to JS.
Pressure from last tick's velocity amplified the 4-cell mode. Compute velocity first, then pressure from the new field, and widen diffs to i32. Bench 960×600 native (300 steps, after this change): sparse 839 steps/s, dense top-quarter 353 steps/s.
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Summary
AIR_CELL=4) so fans blow gases and boil/gunpowder launch a pressure wave.i32intermediates so a grain or fan does not saturate the field.Test plan
just verify(fmt, clippy-D warnings, tests,wasm-pack --target web)→←↑↓cycle; Gunpowder paints as charcoalNative bench after the solver fix (960×600, 300 steps): sparse 839 steps/s, dense top-quarter 353 steps/s.