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Bring MarchingSquares.Variants over from the other branch -- it needs cleanup

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Eryn Wells 2018-10-14 20:00:44 -07:00
parent eb55566a13
commit 7ab620cee8
1 changed files with 131 additions and 0 deletions
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131
MetaballsKit/MarchingSquares.swift
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@ -205,3 +205,134 @@ class MarchingSquares {
encoder.endEncoding()
}
}
struct Variants {
static let geometry: [Float] = [
// 0: no triangles
// 1: lower left corner, 1 triangle
-1.0, -1.0, 0.0,
0.0, -1.0, 0.0,
-1.0, 0.0, 0.0,
// 2: lower right corner, 1 triangle
1.0, -1.0, 0.0,
1.0, 0.0, 0.0,
0.0, -1.0, 0.0,
// 3: bottom half, 2 triangles
-1.0, 0.0, 0.0,
-1.0, -1.0, 0.0,
1.0, 0.0, 0.0,
1.0, -1.0, 0.0,
// 4: top right corner, 1 triangle
1.0, 1.0, 0.0,
0.0, 1.0, 0.0,
1.0, 0.0, 0.0,
// 5: top right and bottom left, 4 triangles
-1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
0.0, -1.0, 0.0,
1.0, 0.0, 0.0,
// 6: right half, 2 triangles
1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
0.0, -1.0, 0.0,
0.0, 1.0, 0.0,
// 7: bottom right corner 7/8ths, 3 triangles
-1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
1.0, -1.0, 0.0,
// 8: top left corner, 1 triangle
-1.0, 1.0, 0.0,
0.0, 1.0, 0.0,
-1.0, 0.0, 0.0,
// 9: left half, 2 triangles
-1.0, 1.0, 0.0,
0.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
0.0, -1.0, 0.0,
// 10: top left and bottom right, 4 triangles
-1.0, 0.0, 0.0,
0.0, -1.0, 0.0,
-1.0, 1.0, 0.0,
1.0, -1.0, 0.0,
0.0, 1.0, 0.0,
1.0, 0.0, 0.0,
// 11: bottom left corner 7/8th, 3 triangles
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
1.0, -1.0, 0.0,
-1.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
// 12: top half, 2 triangles
-1.0, 1.0, 0.0,
1.0, 1.0, 0.0,
-1.0, 0.0, 0.0,
1.0, 0.0, 0.0,
// 13: top left corner 7/8ths, 3 triangles
0.0, -1.0, 0.0,
1.0, 0.0, 0.0,
-1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
-1.0, 1.0, 0.0,
// 14: top right corner 7/8th, 3 triangles
-1.0, 0.0, 0.0,
0.0, -1.0, 0.0,
-1.0, 1.0, 0.0,
1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
// 15: full, 2 triangles
-1.0, -1.0, 0.0,
1.0, -1.0, 0.0,
-1.0, 1.0, 0.0,
1.0, 1.0, 0.0,
]
static func numberOfTriangles(for variation: UInt) -> UInt {
switch variation {
case 0: return 0
case 1: return 1
case 2: return 1
case 3: return 2
case 4: return 1
case 5: return 4
case 6: return 2
case 7: return 3
case 8: return 1
case 9: return 2
case 10: return 4
case 11: return 3
case 12: return 2
case 13: return 3
case 14: return 3
case 15: return 2
default: return 0
}
}
static func startingIndex(for variation: UInt) -> UInt {
switch variation {
case 0: return 0
case 1: return 0
case 2: return 3
case 3: return 6
case 4: return 10
case 5: return 13
case 6: return 19
case 7: return 23
case 8: return 28
case 9: return 31
case 10: return 35
case 11: return 41
case 12: return 46
case 13: return 50
case 14: return 55
case 15: return 60
default: return 0
}
}
var buffer: MTLBuffer?
}