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Execute a pass for rendering marching squares

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(This just renders the geometry of the field the pixel pipeline draws onto so far)
This commit is contained in:
Eryn Wells 2018-10-11 16:28:22 -07:00
parent 03923bdd7e
commit 7a14ac461e
1 changed files with 31 additions and 8 deletions
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39
MetaballsKit/Renderer.swift
View file

@ -35,7 +35,7 @@ public class Renderer: NSObject, MTKViewDelegate {
view.device = device view.device = device
configurePixelPipeline(withPixelFormat: view.colorPixelFormat) configurePixelPipeline(withPixelFormat: view.colorPixelFormat)
configureMarchingSquaresPipeline() configureMarchingSquaresPipeline(withPixelFormat: view.colorPixelFormat)
try! delegate.field.setupMetal(withDevice: device) try! delegate.field.setupMetal(withDevice: device)
} }
@ -105,7 +105,7 @@ public class Renderer: NSObject, MTKViewDelegate {
} }
} }
private func configureMarchingSquaresPipeline() { private func configureMarchingSquaresPipeline(withPixelFormat pixelFormat: MTLPixelFormat) {
guard let library = library else { guard let library = library else {
fatalError("Couldn't get Metal library") fatalError("Couldn't get Metal library")
} }
@ -117,6 +117,19 @@ public class Renderer: NSObject, MTKViewDelegate {
pipelineDesc.label = "Marching Squares Pipeline" pipelineDesc.label = "Marching Squares Pipeline"
pipelineDesc.vertexFunction = vertexShader pipelineDesc.vertexFunction = vertexShader
pipelineDesc.fragmentFunction = fragmentShader pipelineDesc.fragmentFunction = fragmentShader
if let renderAttachment = pipelineDesc.colorAttachments[0] {
renderAttachment.pixelFormat = pixelFormat
// Pulled all this from SO. I don't know what it means, but it makes the alpha channel work.
// TODO: Learn what this means???
// https://stackoverflow.com/q/43727335/1174185
renderAttachment.isBlendingEnabled = true
renderAttachment.alphaBlendOperation = .add
renderAttachment.rgbBlendOperation = .add
renderAttachment.sourceRGBBlendFactor = .sourceAlpha
renderAttachment.sourceAlphaBlendFactor = .sourceAlpha
renderAttachment.destinationRGBBlendFactor = .oneMinusSourceAlpha
renderAttachment.destinationAlphaBlendFactor = .oneMinusSourceAlpha
}
do { do {
marchingSquaresPipeline = try device.makeRenderPipelineState(descriptor: pipelineDesc) marchingSquaresPipeline = try device.makeRenderPipelineState(descriptor: pipelineDesc)
@ -150,16 +163,16 @@ public class Renderer: NSObject, MTKViewDelegate {
field.update() field.update()
if let buffer = commandQueue.makeCommandBuffer() { if let buffer = commandQueue.makeCommandBuffer(),
buffer.label = "Render" let renderPass = view.currentRenderPassDescriptor {
buffer.label = "Metaballs Command Buffer"
var didEncode = false var didEncode = false
if let renderPass = view.currentRenderPassDescriptor, if let pipeline = pixelPipeline,
let renderPipelineState = pixelPipeline,
let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass) { let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass) {
encoder.label = "Render Pass" 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.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(renderPipelineState) encoder.setRenderPipelineState(pipeline)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0) encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.setFragmentBuffer(field.parametersBuffer, offset: 0, index: 0) encoder.setFragmentBuffer(field.parametersBuffer, offset: 0, index: 0)
encoder.setFragmentBuffer(field.ballBuffer, offset: 0, index: 1) encoder.setFragmentBuffer(field.ballBuffer, offset: 0, index: 1)
@ -168,6 +181,16 @@ public class Renderer: NSObject, MTKViewDelegate {
didEncode = true didEncode = true
} }
if let pipeline = marchingSquaresPipeline,
let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass) {
encoder.label = "Marching Squares Render"
encoder.setRenderPipelineState(pipeline)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, index: 0)
encoder.drawPrimitives(type: .line, vertexStart: 0, vertexCount: 6)
encoder.endEncoding()
didEncode = true
}
if didEncode, let drawable = view.currentDrawable { if didEncode, let drawable = view.currentDrawable {
buffer.present(drawable) buffer.present(drawable)
} }