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prep for chunk meshing

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This commit is contained in:
a dinosaur 2024-09-01 21:16:05 +10:00
parent cb0e7bb232
commit da26773221
11 changed files with 157 additions and 91 deletions
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2
Sources/Voxelotl/CMakeLists.txt
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@ -36,6 +36,7 @@ add_executable(Voxelotl MACOSX_BUNDLE
# Renderer classes
Renderer/Material.swift
Renderer/Environment.swift
Renderer/Mesh.swift
Renderer/Renderer.swift
# Input wrappers
@ -44,6 +45,7 @@ add_executable(Voxelotl MACOSX_BUNDLE
Input/Mouse.swift
# Core utility classes
CubeMeshBuilder.swift
Color.swift
Camera.swift
FPSCalculator.swift

15
Sources/Voxelotl/Chunk.swift
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@ -1,4 +1,4 @@
public struct Chunk {
public struct Chunk: Hashable {
public static let shift = 4 // 16
public static let size: Int = 1 << shift
public static let mask: Int = size - 1
@ -63,6 +63,15 @@ public struct Chunk {
}
}
public func forEach(_ body: @escaping (Block, SIMD3<Int>) throws -> Void) rethrows {
for i in 0..<Self.blockCount {
try body(blocks[i], self.origin &+ SIMD3(
x: i & Self.mask,
y: (i &>> Self.shift) & Self.mask,
z: (i &>> (Self.shift + Self.shift)) & Self.mask))
}
}
public func map<T>(block transform: (Block, SIMD3<Int>) throws -> T) rethrows -> [T] {
assert(self.blocks.count == Self.blockCount)
@ -112,12 +121,12 @@ public struct Chunk {
}
}
public enum BlockType: Equatable {
public enum BlockType: Hashable {
case air
case solid(_ color: Color<Float16>)
}
public struct Block {
public struct Block: Hashable {
public var type: BlockType
public init(_ type: BlockType) {

2
Sources/Voxelotl/Color.swift
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@ -1,6 +1,6 @@
import Foundation
public struct Color<T: SIMDScalar>: Equatable {
public struct Color<T: SIMDScalar>: Hashable {
private var _values: SIMD4<T>
internal var values: SIMD4<T> { self._values }

40
Sources/Voxelotl/CubeMeshBuilder.swift Normal file
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@ -0,0 +1,40 @@
public struct CubeMeshBuilder {
public static func build(bound: AABB) -> Mesh<VertexPositionNormalTexcoord, UInt16> {
let cubeVertices: [VertexPositionNormalTexcoord] = [
.init(position: .init( bound.left, bound.bottom, bound.near), normal: .back, texCoord: .init(0, 0)),
.init(position: .init(bound.right, bound.bottom, bound.near), normal: .back, texCoord: .init(1, 0)),
.init(position: .init( bound.left, bound.top, bound.near), normal: .back, texCoord: .init(0, 1)),
.init(position: .init(bound.right, bound.top, bound.near), normal: .back, texCoord: .init(1, 1)),
.init(position: .init(bound.right, bound.bottom, bound.near), normal: .right, texCoord: .init(0, 0)),
.init(position: .init(bound.right, bound.bottom, bound.far), normal: .right, texCoord: .init(1, 0)),
.init(position: .init(bound.right, bound.top, bound.near), normal: .right, texCoord: .init(0, 1)),
.init(position: .init(bound.right, bound.top, bound.far), normal: .right, texCoord: .init(1, 1)),
.init(position: .init(bound.right, bound.bottom, bound.far), normal: .forward, texCoord: .init(0, 0)),
.init(position: .init( bound.left, bound.bottom, bound.far), normal: .forward, texCoord: .init(1, 0)),
.init(position: .init(bound.right, bound.top, bound.far), normal: .forward, texCoord: .init(0, 1)),
.init(position: .init( bound.left, bound.top, bound.far), normal: .forward, texCoord: .init(1, 1)),
.init(position: .init( bound.left, bound.bottom, bound.far), normal: .left, texCoord: .init(0, 0)),
.init(position: .init( bound.left, bound.bottom, bound.near), normal: .left, texCoord: .init(1, 0)),
.init(position: .init( bound.left, bound.top, bound.far), normal: .left, texCoord: .init(0, 1)),
.init(position: .init( bound.left, bound.top, bound.near), normal: .left, texCoord: .init(1, 1)),
.init(position: .init( bound.left, bound.bottom, bound.far), normal: .down, texCoord: .init(0, 0)),
.init(position: .init(bound.right, bound.bottom, bound.far), normal: .down, texCoord: .init(1, 0)),
.init(position: .init( bound.left, bound.bottom, bound.near), normal: .down, texCoord: .init(0, 1)),
.init(position: .init(bound.right, bound.bottom, bound.near), normal: .down, texCoord: .init(1, 1)),
.init(position: .init( bound.left, bound.top, bound.near), normal: .up, texCoord: .init(0, 0)),
.init(position: .init(bound.right, bound.top, bound.near), normal: .up, texCoord: .init(1, 0)),
.init(position: .init( bound.left, bound.top, bound.far), normal: .up, texCoord: .init(0, 1)),
.init(position: .init(bound.right, bound.top, bound.far), normal: .up, texCoord: .init(1, 1))
]
return .init(vertices: cubeVertices, indices: cubeIndices)
}
}
fileprivate let cubeIndices: [UInt16] = [
0, 1, 2, 2, 1, 3,
4, 5, 6, 6, 5, 7,
8, 9, 10, 10, 9, 11,
12, 13, 14, 14, 13, 15,
16, 17, 18, 18, 17, 19,
20, 21, 22, 22, 21, 23
]

8
Sources/Voxelotl/Game.swift
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@ -25,11 +25,15 @@ class Game: GameDelegate {
var player = Player()
var projection: matrix_float4x4 = .identity
var world = World()
var cubeMesh: RendererMesh?
var renderChunks = [SIMD3<Int>: Mesh<VertexPositionNormalTexcoord, UInt16>]()
func create(_ renderer: Renderer) {
self.resetPlayer()
self.generateWorld()
self.cubeMesh = renderer.createMesh(CubeMeshBuilder.build(bound: .fromUnitCube(position: .zero, scale: .one)))
renderer.clearColor = Color<Double>.black.mix(.white, 0.1).linear
}
@ -104,8 +108,8 @@ class Game: GameDelegate {
.init(angle: totalTime * 0.7, axis: .init(0, 0, 1)),
color: .init(r: 0.5, g: 0.5, b: 1).linear))
}
if !instances.isEmpty {
renderer.batch(instances: instances, material: material, environment: env, camera: self.camera)
if self.cubeMesh != nil && !instances.isEmpty {
renderer.batch(instances: instances, mesh: self.cubeMesh!, material: material, environment: env, camera: self.camera)
}
}

32
Sources/Voxelotl/Math/AABB.swift
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@ -1,45 +1,45 @@
import simd
struct AABB {
public struct AABB {
private var _bounds: simd_float2x3
var lower: SIMD3<Float> {
public var lower: SIMD3<Float> {
get { _bounds[0] }
set(row) { self._bounds[0] = row }
}
var upper: SIMD3<Float> {
public var upper: SIMD3<Float> {
get { _bounds[1] }
set(row) { self._bounds[1] = row }
}
var center: SIMD3<Float> {
public var center: SIMD3<Float> {
get { (self._bounds[0] + self._bounds[1]) / 2 }
}
var size: SIMD3<Float> {
public var size: SIMD3<Float> {
get { self._bounds[1] - self._bounds[0] }
}
var left: Float { self._bounds[0].x }
var bottom: Float { self._bounds[0].y }
var far: Float { self._bounds[0].z }
var right: Float { self._bounds[1].x }
var top: Float { self._bounds[1].y }
var near: Float { self._bounds[1].z }
public var left: Float { self._bounds[0].x }
public var bottom: Float { self._bounds[0].y }
public var far: Float { self._bounds[0].z }
public var right: Float { self._bounds[1].x }
public var top: Float { self._bounds[1].y }
public var near: Float { self._bounds[1].z }
private init(bounds: simd_float2x3) {
self._bounds = bounds
}
init(from: SIMD3<Float>, to: SIMD3<Float>) {
public init(from: SIMD3<Float>, to: SIMD3<Float>) {
self.init(bounds: .init(from, to))
}
static func fromUnitCube(position: SIMD3<Float> = .zero, scale: SIMD3<Float> = .one) -> Self {
public static func fromUnitCube(position: SIMD3<Float> = .zero, scale: SIMD3<Float> = .one) -> Self {
self.init(
from: position - scale,
to: position + scale)
}
func touching(_ other: Self) -> Bool{
public func touching(_ other: Self) -> Bool{
let distLower = other._bounds[0] - self._bounds[1] // x: left, y: bottom, z: far
let distUpper = self._bounds[0] - other._bounds[1] // x: right, y: top, z: near
@ -51,8 +51,8 @@ struct AABB {
}
}
extension AABB {
static func + (lhs: Self, rhs: SIMD3<Float>) -> Self {
public extension AABB {
public static func + (lhs: Self, rhs: SIMD3<Float>) -> Self {
.init(bounds: lhs._bounds + .init(rhs, rhs))
}
}

19
Sources/Voxelotl/Math/VectorExtensions.swift
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@ -22,11 +22,13 @@ public extension SIMD3 {
}
}
public extension SIMD3 where Scalar: FloatingPoint {
@inline(__always) static var X: Self { Self(1, 0, 0) }
@inline(__always) static var Y: Self { Self(0, 1, 0) }
@inline(__always) static var Z: Self { Self(0, 0, 1) }
public extension SIMD3 where Scalar: Numeric {
@inline(__always) static var X: Self { Self(1, 0, 0) }
@inline(__always) static var Y: Self { Self(0, 1, 0) }
@inline(__always) static var Z: Self { Self(0, 0, 1) }
}
public extension SIMD3 where Scalar: FloatingPoint {
@inline(__always) static var up: Self { Y }
@inline(__always) static var down: Self { -Y }
@inline(__always) static var left: Self { -X }
@ -35,6 +37,15 @@ public extension SIMD3 where Scalar: FloatingPoint {
@inline(__always) static var back: Self { Z }
}
public extension SIMD3 where Scalar: SignedInteger & FixedWidthInteger {
@inline(__always) static var up: Self { Y }
@inline(__always) static var down: Self { 0 &- Y }
@inline(__always) static var left: Self { 0 &- X }
@inline(__always) static var right: Self { X }
@inline(__always) static var forward: Self { 0 &- Z }
@inline(__always) static var back: Self { Z }
}
public extension SIMD3 where Scalar: Numeric & AdditiveArithmetic {
@inline(__always) func dot(_ b: Self) -> Scalar { self.x * b.x + self.y * b.y + self.z * b.z }
}

12
Sources/Voxelotl/Raycast.swift
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@ -90,12 +90,12 @@ public enum RaycastSide {
public extension SIMD3 where Scalar == Int {
func offset(by side: RaycastSide) -> Self {
let ofs: Self = switch side {
case .right: .init( 1, 0, 0)
case .left: .init(-1, 0, 0)
case .up: .init( 0, 1, 0)
case .down: .init( 0, -1, 0)
case .back: .init( 0, 0, 1)
case .front: .init( 0, 0, -1)
case .right: .right
case .left: .left
case .up: .up
case .down: .down
case .back: .back
case .front: .forward
}
return self &+ ofs
}

16
Sources/Voxelotl/Renderer/Mesh.swift Normal file
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@ -0,0 +1,16 @@
public struct Mesh<VertexType: Vertex, IndexType: UnsignedInteger> {
public let vertices: [VertexType]
public let indices: [IndexType]
}
public extension Mesh {
static var empty: Self { .init(vertices: .init(), indices: .init()) }
}
public protocol Vertex: Equatable {}
public struct VertexPositionNormalTexcoord: Vertex {
var position: SIMD3<Float>
var normal: SIMD3<Float>
var texCoord: SIMD2<Float>
}

92
Sources/Voxelotl/Renderer/Renderer.swift
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@ -4,42 +4,6 @@ import QuartzCore.CAMetalLayer
import simd
import ShaderTypes
fileprivate let cubeVertices: [ShaderVertex] = [
.init(position: .init(-1, -1, 1), normal: .back, texCoord: .init(0, 0)),
.init(position: .init( 1, -1, 1), normal: .back, texCoord: .init(1, 0)),
.init(position: .init(-1, 1, 1), normal: .back, texCoord: .init(0, 1)),
.init(position: .init( 1, 1, 1), normal: .back, texCoord: .init(1, 1)),
.init(position: .init( 1, -1, 1), normal: .right, texCoord: .init(0, 0)),
.init(position: .init( 1, -1, -1), normal: .right, texCoord: .init(1, 0)),
.init(position: .init( 1, 1, 1), normal: .right, texCoord: .init(0, 1)),
.init(position: .init( 1, 1, -1), normal: .right, texCoord: .init(1, 1)),
.init(position: .init( 1, -1, -1), normal: .forward, texCoord: .init(0, 0)),
.init(position: .init(-1, -1, -1), normal: .forward, texCoord: .init(1, 0)),
.init(position: .init( 1, 1, -1), normal: .forward, texCoord: .init(0, 1)),
.init(position: .init(-1, 1, -1), normal: .forward, texCoord: .init(1, 1)),
.init(position: .init(-1, -1, -1), normal: .left, texCoord: .init(0, 0)),
.init(position: .init(-1, -1, 1), normal: .left, texCoord: .init(1, 0)),
.init(position: .init(-1, 1, -1), normal: .left, texCoord: .init(0, 1)),
.init(position: .init(-1, 1, 1), normal: .left, texCoord: .init(1, 1)),
.init(position: .init(-1, -1, -1), normal: .down, texCoord: .init(0, 0)),
.init(position: .init( 1, -1, -1), normal: .down, texCoord: .init(1, 0)),
.init(position: .init(-1, -1, 1), normal: .down, texCoord: .init(0, 1)),
.init(position: .init( 1, -1, 1), normal: .down, texCoord: .init(1, 1)),
.init(position: .init(-1, 1, 1), normal: .up, texCoord: .init(0, 0)),
.init(position: .init( 1, 1, 1), normal: .up, texCoord: .init(1, 0)),
.init(position: .init(-1, 1, -1), normal: .up, texCoord: .init(0, 1)),
.init(position: .init( 1, 1, -1), normal: .up, texCoord: .init(1, 1)),
]
fileprivate let cubeIndices: [UInt16] = [
0, 1, 2, 2, 1, 3,
4, 5, 6, 6, 5, 7,
8, 9, 10, 10, 9, 11,
12, 13, 14, 14, 13, 15,
16, 17, 18, 18, 17, 19,
20, 21, 22, 22, 21, 23
]
fileprivate let numFramesInFlight: Int = 3
fileprivate let colorFormat: MTLPixelFormat = .bgra8Unorm_srgb
fileprivate let depthFormat: MTLPixelFormat = .depth32Float
@ -61,7 +25,6 @@ public class Renderer {
private var _encoder: MTLRenderCommandEncoder! = nil
private var vtxBuffer: MTLBuffer, idxBuffer: MTLBuffer
private var defaultTexture: MTLTexture
private var cubeTexture: MTLTexture? = nil
@ -150,24 +113,6 @@ public class Renderer {
throw RendererError.initFailure("Failed to create pipeline state: \(error.localizedDescription)")
}
// Create cube mesh buffers
guard let vtxBuffer = device.makeBuffer(
bytes: cubeVertices,
length: cubeVertices.count * MemoryLayout<ShaderVertex>.stride,
options: .storageModeManaged)
else {
throw RendererError.initFailure("Failed to create vertex buffer")
}
self.vtxBuffer = vtxBuffer
guard let idxBuffer = device.makeBuffer(
bytes: cubeIndices,
length: cubeIndices.count * MemoryLayout<UInt16>.stride,
options: .storageModeManaged)
else {
throw RendererError.initFailure("Failed to create index buffer")
}
self.idxBuffer = idxBuffer
// Create a default texture
do {
self.defaultTexture = try Self.loadTexture(device, queue, image2D: Image2D(Data([
@ -192,6 +137,29 @@ public class Renderer {
}
func createMesh(_ mesh: Mesh<VertexPositionNormalTexcoord, UInt16>) -> RendererMesh? {
let vertices = mesh.vertices.map {
ShaderVertex(position: $0.position, normal: $0.normal, texCoord: $0.texCoord)
}
guard let vtxBuffer = self.device.makeBuffer(
bytes: vertices,
length: vertices.count * MemoryLayout<ShaderVertex>.stride,
options: .storageModeManaged)
else {
printErr("Failed to create vertex buffer")
return nil
}
guard let idxBuffer = device.makeBuffer(
bytes: mesh.indices,
length: mesh.indices.count * MemoryLayout<UInt16>.stride,
options: .storageModeManaged)
else {
printErr("Failed to create index buffer")
return nil
}
return .init(_vertBuf: vtxBuffer, _idxBuf: idxBuffer, numIndices: mesh.indices.count)
}
static func loadTexture(_ device: MTLDevice, _ queue: MTLCommandQueue, resourcePath path: String) throws -> MTLTexture {
do {
return try loadTexture(device, queue, url: Bundle.main.getResource(path))
@ -329,7 +297,6 @@ public class Renderer {
encoder.setRenderPipelineState(pso)
encoder.setDepthStencilState(depthStencilState)
encoder.setFragmentTexture(cubeTexture ?? defaultTexture, index: 0)
encoder.setVertexBuffer(vtxBuffer, offset: 0, index: VertexShaderInputIdx.vertices.rawValue)
self._encoder = encoder
frameFunc(self)
@ -346,7 +313,7 @@ public class Renderer {
}
}
func batch(instances: [Instance], material: Material, environment: Environment, camera: Camera) {
func batch(instances: [Instance], mesh: RendererMesh, material: Material, environment: Environment, camera: Camera) {
assert(self._encoder != nil, "batch can't be called outside of a frame being rendered")
var vertUniforms = VertexShaderUniforms(projView: camera.viewProjection)
@ -391,6 +358,7 @@ public class Renderer {
self._encoder.setCullMode(.init(environment.cullFace))
self._encoder.setVertexBuffer(mesh._vertBuf, offset: 0, index: VertexShaderInputIdx.vertices.rawValue)
self._encoder.setVertexBuffer(instanceBuffer,
offset: 0,
index: VertexShaderInputIdx.instance.rawValue)
@ -404,14 +372,20 @@ public class Renderer {
self._encoder.drawIndexedPrimitives(
type: .triangle,
indexCount: cubeIndices.count,
indexCount: mesh.numIndices,
indexType: .uint16,
indexBuffer: idxBuffer,
indexBuffer: mesh._idxBuf,
indexBufferOffset: 0,
instanceCount: numInstances)
}
}
public struct RendererMesh {
fileprivate let _vertBuf: MTLBuffer
fileprivate let _idxBuf: MTLBuffer
public let numIndices: Int
}
extension MTLClearColor {
init(_ color: Color<Double>) {
self.init(red: color.r, green: color.g, blue: color.b, alpha: color.a)

10
Sources/Voxelotl/World.swift
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@ -19,6 +19,16 @@ public class World {
self._chunks[position &>> Chunk.shift]?.setBlock(at: position, type: type)
}
func getChunk(id chunkID: SIMD3<Int>) -> Chunk? {
self._chunks[chunkID]
}
public func forEachChunk(_ body: @escaping (_ id: SIMD3<Int>, _ chunk: Chunk) throws -> Void) rethrows {
for i in self._chunks {
try body(i.key, i.value)
}
}
func generate(width: Int, height: Int, depth: Int, seed: UInt64) {
self._generator.reset(seed: seed)
let orig = SIMD3(width, height, depth) / 2