Orkuncakilkaya
8589a5a7b4
prec_put / prec_get / prec_size (Physics' spec): PREC_FULL, 12 bytes, for trees, boulders and stones (u16 x, z in 1/65536 of the chunk; u16 y in cm above y_base; u8 scale over the kind's lo..hi, yaw, seed, wind), and PREC_PACKED, 7 bytes, for the stream kinds (56 bits, least significant first: x 12, z 12, y 12 in cm, scale 6, yaw 6, seed 4, wind 4). An encode takes the cell a value falls in, a decode its centre, so a round trip is stable; a record is read from a []byte at an offset, never a pointer. stream_emit_baked and layer_chunk_put take (recs, at, fmt) and decode through it; the earlier sb7_* pair is gone. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
55 lines
2.5 KiB
Text
55 lines
2.5 KiB
Text
# layer_chunks.ludic — a fixed layer (trees, boulders, stones) held as the baked chunks that are in, not
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# the whole map: a slab per chunk in the layer's instance list, put when the ring brings the chunk in
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# and dropped when it goes, the list re-uploaded at most once a frame. A record's layout is place_rec.ludic's.
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# the layer made ready for chunks of an n x n grid: its slab index, once at map load, and nothing in it
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@alloc_ok("a map being loaded: a layer's chunk index, once")
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export function layer_chunks_begin(l: Layer, n: int) -> void {
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if l.ck_off == null or len(l.ck_off) != n * n {
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if l.ck_off != null { free(l.ck_off); free(l.ck_cnt) }
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l.ck_off = words(n * n); l.ck_cnt = words(n * n)
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}
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if l.lc_rec == null { l.lc_rec = floats(INST_FLOATS) }
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for i in 0 .. n * n { l.ck_off[i] = -1; l.ck_cnt[i] = 0 }
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l.count = 0
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layer_chunks_changed(l)
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}
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# chunk `id`'s `count` records (format fmt, place_rec.ludic) at byte `at` of recs put into the layer,
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# replacing what it had; as many as the layer has room for
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export function layer_chunk_put(l: Layer, id: int, recs: []byte, at: int, fmt: int, count: int, size: float, x0: float, z0: float, y_base: float, lo: float, hi: float) -> void {
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if l.ck_off == null or id < 0 or id >= len(l.ck_off) { return }
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if l.ck_off[id] >= 0 { layer_chunk_drop(l, id) }
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let n = min(count, l.cap - l.count)
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if n <= 0 { return }
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layer_room(l, l.count + n)
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for i in 0 .. n {
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prec_get(fmt, recs, at, i, x0, z0, size, y_base, lo, hi, l.lc_rec)
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for k in 0 .. INST_FLOATS { l.inst[(l.count + i) * INST_FLOATS + k] = l.lc_rec[k] }
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}
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l.ck_off[id] = l.count
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l.ck_cnt[id] = n
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l.count += n
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layer_chunks_changed(l)
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}
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# chunk `id`'s slab taken out: the instances after it move down, and the slabs after it with them
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export function layer_chunk_drop(l: Layer, id: int) -> void {
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if l.ck_off == null or id < 0 or id >= len(l.ck_off) or l.ck_off[id] < 0 { return }
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let off = l.ck_off[id]
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let n = l.ck_cnt[id]
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for k in (off + n) * INST_FLOATS .. l.count * INST_FLOATS { l.inst[k - n * INST_FLOATS] = l.inst[k] }
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for c in 0 .. len(l.ck_off) { if l.ck_off[c] > off { l.ck_off[c] = l.ck_off[c] - n } }
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l.ck_off[id] = -1
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l.ck_cnt[id] = 0
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l.count -= n
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layer_chunks_changed(l)
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}
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# the layer's list changed: the GPU cull's buffers and the view's partition are made again next frame.
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# A layer on the CPU path keeps the grid it had (a baked layer is meant for the GPU cull).
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function layer_chunks_changed(l: Layer) -> void {
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l.g_on = false
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l.g_n = -1
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l.view_gen = -1
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}
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