Wave function collapse: Difference between revisions
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}</syntaxhighlight>
Note: here we use <code>R</code> where J used <code>i</code>, because we use i as an index/loop counter (other than <code>m</code>, <code>y</code> and <code>i</code>), the comments on [[#J|the j implementation]] should be directly relevant here
For simplicity, we use <tt>char</tt> as our pixel datatype (and for truth values), and <tt>int</tt> for indices (C offers a variety of similar datatypes but nothing we are doing here is big enough for that to be a concern).
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│ # # # # │ # # # # # # │ # # # # # │
└──────────────────────────────────┴──────────────────────────────────┴──────────────────────────────────┘</syntaxhighlight>
=={{header|Nim}}==
{{trans|C}}
<syntaxhighlight lang="Nim">import std/[algorithm, math, random]
template XY(row, col, width: int): int =
col + row * width
template XYZ(page, row, col, height, width: int): int =
XY(XY(page, row, height), col, width)
const Blocks = @[byte 0, 0, 0,
0, 0, 0,
0, 0, 0,
0, 0, 0,
1, 1, 1,
0, 1, 0,
0, 1, 0,
0, 1, 1,
0, 1, 0,
0, 1, 0,
1, 1, 1,
0, 0, 0,
0, 1, 0,
1, 1, 0,
0, 1, 0]
proc wfc(blocks: seq[byte]; bdim: (int, int, int); tdim: (int, int); ): seq[byte] =
let (td0, td1) = tdim
let n = td0 * td1
var adj = newSeq[int](n * 4) # Indices in R of the four adjacent blocks.
for i in 0..<td0:
for j in 0..<td1:
adj[XYZ(i, j, 0, td1, 4)]= XY(floorMod(i-1, td0), floorMod(j, td1), td1)
adj[XYZ(i, j, 1, td1, 4)]= XY(floorMod(i, td0), floorMod(j-1, td1), td1)
adj[XYZ(i, j, 2, td1, 4)]= XY(floorMod(i, td0), floorMod(j+1, td1), td1)
adj[XYZ(i, j, 3, td1, 4)]= XY(floorMod(i+1, td0), floorMod(j, td1), td1)
let (bd0, bd1, bd2) = bdim
var horz = newSeq[byte](bd0 * bd0)
for i in 0..<bd0:
for j in 0..<bd0:
horz[XY(i, j, bd0)]= 1
for k in 0..<bd1:
if blocks[XYZ(i, k, 0, bd1, bd2)] != blocks[XYZ(j, k, bd2-1, bd1, bd2)]:
horz[XY(i, j, bd0)]= 0
var vert = newSeq[byte](bd0 * bd0)
for i in 0..<bd0:
for j in 0..<bd0:
vert[XY(i, j, bd0)]= 1
for k in 0..<bd2:
if blocks[XYZ(i, 0, k, bd1, bd2)] != blocks[XYZ(j, bd1-1, k, bd1, bd2)]:
vert[XY(i, j, bd0)]= 0
break
var allow = newSeq[byte](4 * (bd0 + 1) * bd0)
allow.fill(1)
for i in 0..<bd0:
for j in 0..<bd0:
allow[XYZ(0, i, j, bd0+1, bd0)] = vert[XY(j, i, bd0)]
allow[XYZ(1, i, j, bd0+1, bd0)] = horz[XY(j, i, bd0)]
allow[XYZ(2, i, j, bd0+1, bd0)] = horz[XY(i, j, bd0)]
allow[XYZ(3, i, j, bd0+1, bd0)] = vert[XY(i, j, bd0)]
var
todo = newSeq[int](n)
wave = newSeq[byte](n * bd0)
entropy = newSeq[int](n)
indices = newSeq[int](n)
possible = newSeq[int](bd0)
var r = newSeq[int](n)
r.fill(bd0)
while true:
var c = 0
for i in 0..<n:
if bd0 == r[i]:
todo[c]= i
inc c
if c == 0: break
var min = bd0
for i in 0..<c:
entropy[i] = 0
for j in 0..<bd0:
let val = allow[XYZ(0, r[adj[XY(todo[i],0,4)]], j, bd0+1, bd0)] and
allow[XYZ(1, r[adj[XY(todo[i],1,4)]], j, bd0+1, bd0)] and
allow[XYZ(2, r[adj[XY(todo[i],2,4)]], j, bd0+1, bd0)] and
allow[XYZ(3, r[adj[XY(todo[i],3,4)]], j, bd0+1, bd0)]
wave[XY(i, j, bd0)] = val
entropy[i] += val.int
if entropy[i] < min: min = entropy[i]
if min == 0:
r.setLen(0)
break
var d = 0
for i in 0..<c:
if min == entropy[i]:
indices[d] = i
inc d
var ndx = indices[rand(d - 1)]
let ind = ndx * bd0
d = 0
for i in 0..<bd0:
if wave[ind + i] != 0:
possible[d] = i
inc d
r[todo[ndx]] = possible[rand(d - 1)];
if r.len == 0: return @[]
result = newSeq[byte]((1 + td0 * (bd1 - 1)) * (1 + td1 * (bd2 - 1)))
for i0 in 0..<td0:
for i1 in 0..<bd1:
for j0 in 0..<td1:
for j1 in 0..<bd2:
result[XY(XY(j0, j1, bd2-1), XY(i0, i1, bd1-1), 1+td1*(bd2-1))] =
blocks[XYZ(r[XY(i0, j0, td1)], i1, j1, bd1, bd2)]
const BDims = (5, 3, 3)
const Size = (8, 8)
randomize()
let tile = wfc(Blocks, BDims, Size)
if tile.len == 0: quit QuitSuccess
for i in 0..16:
for j in 0..16:
stdout.write " #"[tile[XY(i, j, 17)]], ' '
echo()
</syntaxhighlight>
{{out}}
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=={{header|Perl}}==
Line 867 ⟶ 1,016:
=={{header|Wren}}==
{{trans|C}}
The following is a translation of the C version ''before'' macros were added. Wren doesn't support macros and, whilst I could use functions instead, I decided on efficiency grounds to leave it as it is.
<syntaxhighlight lang="wren">import "random" for Random
var rand = Random.new()
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