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Recompute pixelGeometry after resize

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This commit is contained in:
Eryn Wells 2018-10-12 17:29:06 -07:00
parent c809d18fd2
commit 6bcdc867c4
1 changed files with 27 additions and 14 deletions
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41
MetaballsKit/Renderer.swift
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@ -56,6 +56,14 @@ public class Renderer: NSObject, MTKViewDelegate {
private var pixelPipeline: MTLRenderPipelineState?
private var marchingSquaresPipeline: MTLRenderPipelineState?
private var pixelGeometry: [Vertex] = [
Vertex(position: Float2(x: 1, y: -1), textureCoordinate: Float2(x: 1, y: 0)),
Vertex(position: Float2(x: -1, y: -1), textureCoordinate: Float2(x: 0, y: 0)),
Vertex(position: Float2(x: -1, y: 1), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: 1, y: -1), textureCoordinate: Float2(x: 1, y: 0)),
Vertex(position: Float2(x: -1, y: 1), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: 1, y: 1), textureCoordinate: Float2(x: 1, y: 1))
]
private var parametersBuffer: MTLBuffer?
override public init() {
@ -148,13 +156,29 @@ public class Renderer: NSObject, MTKViewDelegate {
}
}
private func pixelGeometry(forAspectRatio aspectRatio: Float) -> [Vertex] {
return [
Vertex(position: Float2(x: aspectRatio, y: -1), textureCoordinate: Float2(x: 1, y: 0)),
Vertex(position: Float2(x: -aspectRatio, y: -1), textureCoordinate: Float2(x: 0, y: 0)),
Vertex(position: Float2(x: -aspectRatio, y: 1), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: aspectRatio, y: -1), textureCoordinate: Float2(x: 1, y: 0)),
Vertex(position: Float2(x: -aspectRatio, y: 1), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: aspectRatio, y: 1), textureCoordinate: Float2(x: 1, y: 1))
]
}
/// MARK: - 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)
// Generate a new surface to draw the pixel version on
pixelGeometry = pixelGeometry(forAspectRatio: aspectRatio)
// Reproject with the new aspect ratio.
if let buffer = parametersBuffer {
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)
@ -166,17 +190,6 @@ public class Renderer: NSObject, MTKViewDelegate {
return
}
// Two triangles, plus texture coordinates.
let points: [Vertex] = [
Vertex(position: Float2(x: 1, y: -1), textureCoordinate: Float2(x: 1, y: 0)),
Vertex(position: Float2(x: -1, y: -1), textureCoordinate: Float2(x: 0, y: 0)),
Vertex(position: Float2(x: -1, y: 1), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: 1, y: -1), textureCoordinate: Float2(x: 1, y: 0)),
Vertex(position: Float2(x: -1, y: 1), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: 1, y: 1), textureCoordinate: Float2(x: 1, y: 1))
]
field.update()
if let buffer = commandQueue.makeCommandBuffer(),
@ -189,7 +202,7 @@ public class Renderer: NSObject, MTKViewDelegate {
let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass) {
encoder.label = "Pixel Render"
encoder.setRenderPipelineState(pipeline)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.setVertexBytes(pixelGeometry, length: pixelGeometry.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)
@ -206,7 +219,7 @@ public class Renderer: NSObject, MTKViewDelegate {
let encoder = buffer.makeRenderCommandEncoder(descriptor: pass) {
encoder.label = "Marching Squares Render"
encoder.setRenderPipelineState(pipeline)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.setVertexBytes(pixelGeometry, length: pixelGeometry.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.setVertexBuffer(parametersBuffer, offset: 0, index: 1)
encoder.setTriangleFillMode(.lines)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 6)