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Fix the projection stuff

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Geometry also in window coordinates, just to make things easier...
This commit is contained in:
Eryn Wells 2018-10-13 21:29:38 -07:00
parent 63faef4028
commit 3399bbcd53
2 changed files with 19 additions and 20 deletions
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2
MetaballsKit/Math.swift
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@ -70,7 +70,7 @@ extension Matrix4x4 {
Float4(0.0, 0.0, -2.0 / (far - near), -(far + near) / (far - near)), Float4(0.0, 0.0, -2.0 / (far - near), -(far + near) / (far - near)),
Float4(0.0, 0.0, 0.0, 1.0) Float4(0.0, 0.0, 0.0, 1.0)
] ]
return Matrix4x4(rows) return Matrix4x4(rows: rows)
} }
} }

37
MetaballsKit/Renderer.swift
View file

@ -56,14 +56,7 @@ public class Renderer: NSObject, MTKViewDelegate {
private var pixelPipeline: MTLRenderPipelineState? private var pixelPipeline: MTLRenderPipelineState?
private var marchingSquaresPipeline: MTLRenderPipelineState? private var marchingSquaresPipeline: MTLRenderPipelineState?
private var pixelGeometry: [Vertex] = [ 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? private var parametersBuffer: MTLBuffer?
private var inFlightSemaphore: DispatchSemaphore private var inFlightSemaphore: DispatchSemaphore
@ -160,14 +153,17 @@ public class Renderer: NSObject, MTKViewDelegate {
} }
} }
private func pixelGeometry(forAspectRatio aspectRatio: Float) -> [Vertex] { private func pixelGeometry(forViewSize size: CGSize) -> [Vertex] {
let w = Float(size.width)
let h = Float(size.height)
return [ return [
Vertex(position: Float2(x: aspectRatio, y: -1), textureCoordinate: Float2(x: 1, y: 0)), Vertex(position: Float2(x: w, y: h), textureCoordinate: Float2(x: 1, y: 1)),
Vertex(position: Float2(x: -aspectRatio, y: -1), textureCoordinate: Float2(x: 0, y: 0)), Vertex(position: Float2(x: 0, y: h), textureCoordinate: Float2(x: 0, y: 1)),
Vertex(position: Float2(x: -aspectRatio, y: 1), textureCoordinate: Float2(x: 0, y: 1)), Vertex(position: Float2(x: 0, y: 0), textureCoordinate: Float2(x: 0, y: 0)),
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: w, y: h), textureCoordinate: Float2(x: 1, y: 1)),
Vertex(position: Float2(x: aspectRatio, y: 1), textureCoordinate: Float2(x: 1, y: 1)) Vertex(position: Float2(x: 0, y: 0), textureCoordinate: Float2(x: 0, y: 0)),
Vertex(position: Float2(x: w, y: 0), textureCoordinate: Float2(x: 1, y: 0))
] ]
} }
@ -176,14 +172,12 @@ public class Renderer: NSObject, MTKViewDelegate {
public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) { public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
delegate?.renderSize = Size(size: size) delegate?.renderSize = Size(size: size)
let aspectRatio = Float(size.width / size.height)
// Generate a new surface to draw the pixel version on // Generate a new surface to draw the pixel version on
pixelGeometry = pixelGeometry(forAspectRatio: aspectRatio) pixelGeometry = pixelGeometry(forViewSize: size)
// Reproject with the new aspect ratio. // Reproject with the new aspect ratio.
if let buffer = parametersBuffer { 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 projectionMatrix = Matrix4x4.orthographicProjection(top: 0, left: 0, bottom: Float(size.height), right: Float(size.width), near: -1.0, far: 1.0)
let params = RenderParameters(projection: projectionMatrix) let params = RenderParameters(projection: projectionMatrix)
memcpy(buffer.contents(), [params], MemoryLayout<RenderParameters>.size) memcpy(buffer.contents(), [params], MemoryLayout<RenderParameters>.size)
} }
@ -209,6 +203,11 @@ public class Renderer: NSObject, MTKViewDelegate {
field.update() field.update()
if self.pixelGeometry == nil {
self.pixelGeometry = self.pixelGeometry(forViewSize: view.drawableSize)
}
let pixelGeometry = self.pixelGeometry!
if let renderPass = view.currentRenderPassDescriptor { if let renderPass = view.currentRenderPassDescriptor {
// Render the per-pixel metaballs // Render the per-pixel metaballs
if let pipeline = pixelPipeline, if let pipeline = pixelPipeline,