1 USING: accessors alien.data.map arrays byte-arrays combinators
2 combinators.smart fry grouping images kernel math
3 math.matrices.simd math.order math.vectors noise random
4 sequences math.vectors.simd typed ;
5 FROM: alien.c-types => float uchar ;
8 CONSTANT: terrain-segment-size { 512 512 }
9 CONSTANT: terrain-segment-size-vector float-4{ 512.0 512.0 1.0 1.0 }
10 CONSTANT: terrain-big-noise-scale float-4{ 0.002 0.002 0.002 0.002 }
11 CONSTANT: terrain-small-noise-scale float-4{ 0.05 0.05 0.05 0.05 }
14 { big-noise-table byte-array }
15 { small-noise-table byte-array }
16 { tiny-noise-seed integer } ;
18 : <terrain> ( -- terrain )
19 <perlin-noise-table> <perlin-noise-table>
20 32 random-bits terrain boa ;
22 : seed-at ( seed at -- seed' )
23 first2 [ >integer ] bi@ [ + ] dip [ 32 random-bits + ] curry with-seed ;
25 : big-noise-segment ( terrain at -- bytes )
26 [ big-noise-table>> terrain-big-noise-scale scale-matrix4 ] dip
27 terrain-segment-size-vector v* translation-matrix4 m4.
28 terrain-segment-size perlin-noise-image bitmap>> ; inline
29 : small-noise-segment ( terrain at -- bytes )
30 [ small-noise-table>> terrain-small-noise-scale scale-matrix4 ] dip
31 terrain-segment-size-vector v* translation-matrix4 m4.
32 terrain-segment-size perlin-noise-image bitmap>> ; inline
33 : tiny-noise-segment ( terrain at -- bytes )
34 [ tiny-noise-seed>> ] dip seed-at
35 terrain-segment-size normal-noise-image bitmap>> ; inline
36 : padding ( terrain at -- padding )
37 2drop terrain-segment-size product 255 <repetition> >byte-array ; inline
39 TUPLE: segment image ;
41 : fold-rgba-planes ( r g b a -- rgba )
42 [ vmerge-transpose vmerge-transpose ]
43 data-map( uchar-16 uchar-16 uchar-16 uchar-16 -- uchar-16[4] ) ;
45 : <terrain-image> ( big small tiny padding -- image )
49 RGBA >>component-order
50 ubyte-components >>component-type
51 terrain-segment-size >>dim ;
53 TYPED: terrain-segment ( terrain: terrain at: float-4 -- image )
56 [ small-noise-segment ]
57 [ tiny-noise-segment ]
59 } 2cleave <terrain-image> ;
61 : 4max ( a b c d -- max )
64 : mipmap ( {{pixels}} quot: ( aa ab ba bb -- c ) -- pixels' )
65 [ [ 2 <groups> ] map 2 <groups> ] dip
66 '[ first2 [ [ first2 ] bi@ @ ] 2map ] map ; inline
68 : group-pixels ( bitmap dim -- scanlines )
69 [ 4 <groups> ] [ first <groups> ] bi* ;
71 : concat-pixels ( scanlines -- bitmap )
72 [ concat ] map concat ;
74 : segment-mipmap ( image -- image' )
75 [ clone ] [ bitmap>> ] [ dim>> ] tri
76 group-pixels [ 4max ] mipmap concat-pixels >>bitmap
77 [ 2 v/n ] change-dim ;