34 lines
1.4 KiB
Text
34 lines
1.4 KiB
Text
# chunks.ludic - the Things of one chunk of the world, counted and let go together: what a streamed
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# world asks when a chunk is loaded or dropped. A chunk is chunk_of(x, z, TH_CHUNK_M).
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export function things_chunk(x: float, z: float) -> int { return chunk_of(x, z, TH_CHUNK_M) }
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export function things_chunk_count(things_st: ThingsState, chunk: int) -> int { return ix_count(things_st.th.chunks, chunk) }
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# every Thing standing in the chunk removed for good, the port and the facts told of each as
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# thing_remove tells them; how many went
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export function things_drop_chunk(things_st: mut ThingsState, chunk: int) -> int {
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var n = 0
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let rows = ix_rows(things_st.th.chunks, chunk)
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while len(rows) > 0 {
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thing_remove(things_st, things_st.th.tab.rec[rows[len(rows) - 1]])
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n += 1
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}
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return n
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}
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# change detection: the tick now, the table moving on to the next - a consumer keeps what this
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# returned and asks things_changed(since: it) for what was written after
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export function things_now(things_st: mut ThingsState) -> int {
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let t = tb_tick(things_st.th.tab)
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tb_advance(things_st.th.tab)
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return t
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}
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# every Thing a verb wrote after `since`, into the caller's list (untouched 64-row blocks skipped)
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export function things_changed(things_st: ThingsState, since: int, rows: words, out: []Thing) -> int {
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List.clear(out)
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let tb = things_st.th.tab
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let n = tb_changed_since(tb, since, rows)
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for k in 0 .. n { push(out, tb.rec[rows[k]]) }
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return n
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}
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