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Clean up some of the texture sampling

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Eryn Wells 2018-10-13 20:56:15 -07:00
parent 0a75161759
commit 63faef4028
1 changed files with 4 additions and 5 deletions
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9
MetaballsKit/MarchingSquares.swift
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@ -48,18 +48,17 @@ class MarchingSquares {
func sampleField() { func sampleField() {
guard let samples = samples else { return } guard let samples = samples else { return }
let xSamples = Int(field.size.x / sampleGridSize.x) let bytesPerRow = samples.width * MemoryLayout<Float>.stride
let ySamples = Int(field.size.y / sampleGridSize.y)
for xSample in 0..<xSamples { for xSample in 0..<samples.width {
let x = Float(xSample * Int(sampleGridSize.x)) let x = Float(xSample * Int(sampleGridSize.x))
for ySample in 0..<ySamples { for ySample in 0..<samples.height {
let y = Float(ySample * Int(sampleGridSize.y)) let y = Float(ySample * Int(sampleGridSize.y))
let sample = [field.sample(at: Float2(x: x, y: y))] let sample = [field.sample(at: Float2(x: x, y: y))]
let origin = MTLOrigin(x: xSample, y: ySample, z: 0) let origin = MTLOrigin(x: xSample, y: ySample, z: 0)
let size = MTLSize(width: 1, height: 1, depth: 1) let size = MTLSize(width: 1, height: 1, depth: 1)
let region = MTLRegion(origin: origin, size: size) let region = MTLRegion(origin: origin, size: size)
let bytesPerRow = samples.width * MemoryLayout<Float>.stride
samples.replace(region: region, mipmapLevel: 0, withBytes: sample, bytesPerRow: bytesPerRow) samples.replace(region: region, mipmapLevel: 0, withBytes: sample, bytesPerRow: bytesPerRow)
} }
} }