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Orthographic projectify the vertexes

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This commit is contained in:
Eryn Wells 2018-10-12 17:15:33 -07:00
parent 6dc175c39d
commit 1ed5f0bf6e
2 changed files with 26 additions and 4 deletions
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19
MetaballsKit/Renderer.swift
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@ -19,6 +19,10 @@ public protocol RendererDelegate {
var metalView: MTKView { get }
}
private struct RenderParameters {
var projection: Matrix4x4
}
struct Vertex {
let position: Float2
let textureCoordinate: Float2
@ -52,6 +56,8 @@ public class Renderer: NSObject, MTKViewDelegate {
private var pixelPipeline: MTLRenderPipelineState?
private var marchingSquaresPipeline: MTLRenderPipelineState?
private var parametersBuffer: MTLBuffer?
override public init() {
guard let device = MTLCreateSystemDefaultDevice() else {
fatalError("Unable to create Metal system device")
@ -63,6 +69,9 @@ public class Renderer: NSObject, MTKViewDelegate {
self.device = device
commandQueue = queue
let parametersLength = MemoryLayout<RenderParameters>.size
parametersBuffer = device.makeBuffer(length: parametersLength, options: .storageModeShared)
super.init()
}
@ -143,6 +152,13 @@ public class Renderer: NSObject, MTKViewDelegate {
public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
delegate?.renderSize = Size(size: size)
if let buffer = parametersBuffer {
let aspectRatio = Float(size.width / size.height)
let projectionMatrix = Matrix4x4.orthographicProjection(top: 1.0, left: -aspectRatio, bottom: -1.0, right: aspectRatio, near: 0.0, far: 1.0)
let params = RenderParameters(projection: projectionMatrix)
memcpy(buffer.contents(), [params], MemoryLayout<RenderParameters>.size)
}
}
public func draw(in view: MTKView) {
@ -172,9 +188,9 @@ public class Renderer: NSObject, MTKViewDelegate {
if let pipeline = pixelPipeline,
let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass) {
encoder.label = "Pixel Render"
encoder.setViewport(MTLViewport(originX: 0.0, originY: 0.0, width: Double(view.drawableSize.width), height: Double(view.drawableSize.height), znear: -1.0, zfar: 1.0))
encoder.setRenderPipelineState(pipeline)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.setVertexBuffer(parametersBuffer, offset: 0, index: 1)
encoder.setFragmentBuffer(field.parametersBuffer, offset: 0, index: 0)
encoder.setFragmentBuffer(field.ballBuffer, offset: 0, index: 1)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 6)
@ -191,6 +207,7 @@ public class Renderer: NSObject, MTKViewDelegate {
encoder.label = "Marching Squares Render"
encoder.setRenderPipelineState(pipeline)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.setVertexBuffer(parametersBuffer, offset: 0, index: 1)
encoder.setTriangleFillMode(.lines)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 6)
encoder.endEncoding()