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Add a roughness control

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This commit is contained in:
Eryn Wells 2018-11-10 17:52:37 -05:00
parent 7658210da4
commit 6a43c10b9f
2 changed files with 19 additions and 6 deletions
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24
Terrain2/Algorithms.swift
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@ -233,12 +233,18 @@ public class DiamondSquareGenerator: TerrainGenerator {
struct Algorithm {
let grid: Box
private(set) var rng: RandomNumberGenerator
init(grid: Box, rng: RandomNumberGenerator = SystemRandomNumberGenerator()) {
var roughness: Float = 1.0 {
didSet {
randomRange = -roughness...roughness
}
}
private var randomRange = Float(0)...Float(1)
init(grid: Box) {
// TODO: Assert log2(w) and log2(h) are integral values.
self.grid = grid
self.rng = rng
}
/// Run the algorithm and return the genreated height map.
@ -248,7 +254,7 @@ public class DiamondSquareGenerator: TerrainGenerator {
// 0. Set the corners to initial values if they haven't been set yet.
for p in grid.corners {
let idx = convert(pointToIndex: p)
heightMap[idx] = Float.random(in: 0...1)
heightMap[idx] = Float.random(in: randomRange)
}
grid.breadthFirstSearch { (box: Box) in
@ -258,7 +264,7 @@ public class DiamondSquareGenerator: TerrainGenerator {
let idx = self.convert(pointToIndex: pt)
return heightMap[idx]
}
let midpointValue = Float.random(in: 0...1) + self.average(ofPoints: cornerValues)
let midpointValue = Float.random(in: randomRange) + self.average(ofPoints: cornerValues)
heightMap[convert(pointToIndex: midpoint)] = midpointValue
// 2. Square step. For each of the side midpoints of this box, compute its value.
@ -268,7 +274,7 @@ public class DiamondSquareGenerator: TerrainGenerator {
let idx = self.convert(pointToIndex: pt)
return heightMap[idx]
}
let ptValue = Float.random(in: 0...1) + self.average(ofPoints: cornerValues)
let ptValue = Float.random(in: randomRange) + self.average(ofPoints: cornerValues)
heightMap[convert(pointToIndex: pt)] = ptValue
}
}
@ -316,6 +322,12 @@ public class DiamondSquareGenerator: TerrainGenerator {
return MTLSize(width: 513, height: 513, depth: 1)
}
var roughness: Float = 1.0 {
didSet {
algorithm.roughness = roughness
}
}
var algorithm: Algorithm
let texture: MTLTexture
let textureSemaphore = DispatchSemaphore(value: 1)

1
Terrain2/Terrain.swift
View file

@ -93,6 +93,7 @@ class Terrain: NSObject {
print("Couldn't create algorithm")
return nil
}
(gen as DiamondSquareGenerator).roughness = 0.075
generator = gen
super.init()