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First pass at a marching squares idea

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This commit is contained in:
Eryn Wells 2018-10-13 12:40:53 -07:00
parent d6b8d97b49
commit 09e9bf1f1a
2 changed files with 70 additions and 0 deletions
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6
Metaballs.xcodeproj/project.pbxproj
View file

@ -46,6 +46,8 @@
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C0FF7CC0216B00570081B781 /* Metal.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = C0FF7CBE216B00570081B781 /* Metal.framework */; };
C0FF7CC2217020820081B781 /* MarchingSquares.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0FF7CC1217020820081B781 /* MarchingSquares.swift */; };
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@ -105,6 +107,7 @@
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C0FF7CBE216B00570081B781 /* Metal.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Metal.framework; path = Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Metal.framework; sourceTree = DEVELOPER_DIR; };
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@ -203,6 +206,7 @@
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children = (
C0BBE3A31F2E81C700E68524 /* Metaballs.swift */,
C0FF7CC1217020820081B781 /* MarchingSquares.swift */,
C0CE7BFF1F362C3F001516B6 /* Geometry.swift */,
C0DF1D781F3789DC0038B0A0 /* Memory.swift */,
C0FF7C9C216A6DE00081B781 /* Math.swift */,
@ -433,6 +437,7 @@
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C0FF7C9A2168062C0081B781 /* Preferences.swift in Sources */,
C0FF7C9E216A6DE00081B781 /* Math.swift in Sources */,
C0FF7CC3217020820081B781 /* MarchingSquares.swift in Sources */,
C0FF7C972168062C0081B781 /* Memory.swift in Sources */,
C0FF7C9B2168062C0081B781 /* PreferencesViewController.swift in Sources */,
C0B906E91F455D1A00B5F89B /* MetaballsSaverView.swift in Sources */,
@ -456,6 +461,7 @@
C0FF7C932168062B0081B781 /* Preferences.swift in Sources */,
C0BBE36B1F2E816500E68524 /* AppDelegate.swift in Sources */,
C0FF7C9D216A6DE00081B781 /* Math.swift in Sources */,
C0FF7CC2217020820081B781 /* MarchingSquares.swift in Sources */,
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runOnlyForDeploymentPostprocessing = 0;
};

64
MetaballsKit/MarchingSquares.swift Normal file
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@ -0,0 +1,64 @@
//
// MarchingSquares.swift
// Metaballs
//
// Created by Eryn Wells on 10/11/18.
// Copyright © 2018 Eryn Wells. All rights reserved.
//
import Foundation
import Metal
class MarchingSquares {
private var field: Field
private var sampleGridSize: Size
/// Samples of the field's current state.
private(set) var samples: MTLTexture?
/// Indexes of geometry to render.
private(set) var indexes: MTLTexture?
init(field: Field) {
self.field = field
sampleGridSize = Size(16)
}
func setupMetal(withDevice device: MTLDevice) {
let xSamples = Int(field.size.x / sampleGridSize.x)
let ySamples = Int(field.size.y / sampleGridSize.y)
let samplesDesc = MTLTextureDescriptor()
samplesDesc.textureType = .type2D
samplesDesc.width = xSamples
samplesDesc.height = ySamples
samplesDesc.pixelFormat = .depth32Float
samples = device.makeTexture(descriptor: samplesDesc)
let indexesDesc = MTLTextureDescriptor()
indexesDesc.textureType = .type2D
indexesDesc.width = xSamples - 1
indexesDesc.height = ySamples - 1
indexesDesc.pixelFormat = .a8Unorm
indexes = device.makeTexture(descriptor: indexesDesc)
}
func sampleField() {
guard let samples = samples else { return }
let xSamples = Int(field.size.x / sampleGridSize.x)
let ySamples = Int(field.size.y / sampleGridSize.y)
for xSample in 0..<xSamples {
let x = Float(xSample * Int(sampleGridSize.x))
for ySample in 0..<ySamples {
let y = Float(ySample * Int(sampleGridSize.y))
let sample = [field.sample(at: Float2(x: x, y: y))]
let origin = MTLOrigin(x: xSample, y: ySample, z: 0)
let size = MTLSize(width: 1, height: 1, depth: 1)
let region = MTLRegion(origin: origin, size: size)
let bytesPerRow = samples.width * MemoryLayout<Float>.stride
samples.replace(region: region, mipmapLevel: 0, withBytes: sample, bytesPerRow: bytesPerRow)
}
}
}
}