Orkuncakilkaya
7c25c48dd2
GroundFill gains scale_var (an instance's scale x (1 +- var), from its own hash) and band_grow (x (1 + grow * band)): a painted density carries the local mean, and without them every flower of a kind was the same size and the far clumps lost the growth that kept the cover as the step widened. Both 0: as before. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
67 lines
3.5 KiB
Text
67 lines
3.5 KiB
Text
# ground_fill.ludic — a ground layer's instances in one chunk of its stream, placed from its painted density
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# and nothing else: a candidate in each cell of the band's step, moved by the jitter, kept when a hash of
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# (layer, chunk, band, cell) falls under the density there (times the game's trample, where it asks). The
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# same numbers on every machine and in the editor's preview; the camera decides only which chunks.
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# a ground layer's numbers, as the game's row (GroundLayers) gives them; `layer` is its index in the densities
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export property GroundFill {
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layer: int = 0,
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step0: float = 1.4,
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step1: float = 1.4,
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step2: float = 1.4,
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step3: float = 1.4,
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jitter: float = 1.0,
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scale_lo: float = 1.0,
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scale_hi: float = 1.0,
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wind_lo: float = 0.6,
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wind_hi: float = 1.0,
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sink: float = 0.03,
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trample: bool = true,
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scale_var: float = 0.0, # each instance's own size: x (1 +- var), from its hash (a flower is not its neighbour)
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band_grow: float = 0.0 # a far band's instances larger by this a band, to keep the cover as the step widens
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}
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# how much of a candidate at (x, z) the game lets stand (the camp, the town): 0..1, asked only when the row says
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export function r3d_on_ground_trample(render3d_st: mut Render3dState, f: fn(float, float) -> float) -> void { render3d_st.gd_trample_cb = f }
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function gf_step(g: GroundFill, band: int) -> float {
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if band == 0 { return g.step0 }
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if band == 1 { return g.step1 }
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if band == 2 { return g.step2 }
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return g.step3
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}
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# a hash of the candidate and one of its draws, 0..1 (a 32-bit mix: the same on every machine)
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function gf_hash(a: int, b: int, c: int, d: int, e: int, k: int) -> float {
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var h = (a * 73856093) ^ (b * 19349663) ^ (c * 83492791) ^ (d * 2654435761) ^ (e * 1597334677) ^ (k * 3812015801)
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h = h & 0xFFFFFFFF
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h = ((h ^ (h >> 16)) * 0x7feb352d) & 0xFFFFFFFF
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h = ((h ^ (h >> 15)) * 0x846ca68b) & 0xFFFFFFFF
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h = h ^ (h >> 16)
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return float(h & 0xFFFFFF) / 16777216.0
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}
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# chunk (cx, cz) of stream s at `band`, from layer g (call it inside the game's r3d_stream_fill)
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export function ground_fill(render3d_st: mut Render3dState, s: Stream, cx: int, cz: int, band: int, g: GroundFill) -> void {
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let step = gf_step(g, band)
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if step <= 0.0 or render3d_st.gd_file == null { return }
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let x0 = s.ox + float(cx) * s.size
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let z0 = s.oz + float(cz) * s.size
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let cells = int(Math.ceil(s.size / step))
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for j in 0 .. cells {
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for i in 0 .. cells {
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let px = x0 + (float(i) + 0.5 + (gf_hash(g.layer, cx, cz, band, i * 65536 + j, 0) - 0.5) * g.jitter) * step
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let pz = z0 + (float(j) + 0.5 + (gf_hash(g.layer, cx, cz, band, i * 65536 + j, 1) - 0.5) * g.jitter) * step
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if px < x0 or px >= x0 + s.size or pz < z0 or pz >= z0 + s.size { continue }
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var keep = ground_density_at(render3d_st, g.layer, px, pz, 0)
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if keep <= 0.0 { continue }
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if g.trample and render3d_st.gd_trample_cb != null { keep = keep * render3d_st.gd_trample_cb(px, pz) }
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let e = i * 65536 + j
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if gf_hash(g.layer, cx, cz, band, e, 2) >= keep { continue }
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var sc = Math.lerp(g.scale_lo, g.scale_hi, ground_density_at(render3d_st, g.layer, px, pz, 1))
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sc = sc * (1.0 + (gf_hash(g.layer, cx, cz, band, e, 6) * 2.0 - 1.0) * g.scale_var) * (1.0 + g.band_grow * float(band))
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let h = terrain_height(render3d_st, px, pz) - g.sink
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stream_emit(render3d_st, s, px, h, pz, sc, gf_hash(g.layer, cx, cz, band, e, 3) * 2.0 * PI, gf_hash(g.layer, cx, cz, band, e, 4), Math.lerp(g.wind_lo, g.wind_hi, gf_hash(g.layer, cx, cz, band, e, 5)))
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}
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}
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}
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