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allow for up to 3 frames to be processed at once

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a dinosaur
2024-08-09 21:34:55 +10:00
parent 5f69da369d
commit 5b97a02288
1 changed files with 27 additions and 10 deletions
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37
Sources/Voxelotl/Renderer.swift
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@ -40,9 +40,10 @@ fileprivate let cubeIndices: [UInt16] = [
20, 21, 22, 22, 21, 23
]
class Renderer {
private let depthFormat: MTLPixelFormat = .depth16Unorm
fileprivate let numFramesInFlight: Int = 3
fileprivate let depthFormat: MTLPixelFormat = .depth16Unorm
class Renderer {
private var device: MTLDevice
private var layer: CAMetalLayer
private var viewport: MTLViewport
@ -52,12 +53,15 @@ class Renderer {
private let passDescription = MTLRenderPassDescriptor()
private var pso: MTLRenderPipelineState
private var depthStencilState: MTLDepthStencilState
private var depthStencilTexture: MTLTexture
private var depthTextures: [MTLTexture]
private var vtxBuffer: MTLBuffer, idxBuffer: MTLBuffer
private var defaultTexture: MTLTexture
private var cubeTexture: MTLTexture? = nil
private let inFlightSemaphore = DispatchSemaphore(value: numFramesInFlight)
private var frame = 0
fileprivate static func createMetalDevice() -> MTLDevice? {
MTLCopyAllDevices().reduce(nil, { best, dev in
if best == nil { dev }
@ -95,11 +99,12 @@ class Renderer {
passDescription.depthAttachment.storeAction = .dontCare
passDescription.depthAttachment.clearDepth = 1.0
guard let depthStencilTexture = Self.createDepthTexture(device, size, format: depthFormat) else {
throw RendererError.initFailure("Failed to create depth buffer")
self.depthTextures = try (0..<numFramesInFlight).map { _ in
guard let depthStencilTexture = Self.createDepthTexture(device, size, format: depthFormat) else {
throw RendererError.initFailure("Failed to create depth buffer")
}
return depthStencilTexture
}
self.depthStencilTexture = depthStencilTexture
passDescription.depthAttachment.texture = self.depthStencilTexture
let stencilDepthDescription = MTLDepthStencilDescriptor()
stencilDepthDescription.depthCompareFunction = .less // OpenGL default
@ -266,9 +271,8 @@ class Renderer {
func resize(size: SIMD2<Int>) {
if Int(self.viewport.width) != size.x || Int(self.viewport.height) != size.y {
if let depthStencilTexture = Self.createDepthTexture(device, size, format: depthFormat) {
self.depthStencilTexture = depthStencilTexture
passDescription.depthAttachment.texture = self.depthStencilTexture
self.depthTextures = (0..<numFramesInFlight).map { _ in
Self.createDepthTexture(device, size, format: depthFormat)!
}
}
@ -307,15 +311,23 @@ class Renderer {
var uniforms = ShaderUniforms(projView: projection * view)
// Lock the semaphore here if too many frames are "in flight"
_ = inFlightSemaphore.wait(timeout: .distantFuture)
guard let rt = layer.nextDrawable() else {
throw RendererError.drawFailure("Failed to get next drawable render target")
}
passDescription.colorAttachments[0].texture = rt.texture
passDescription.depthAttachment.texture = self.depthTextures[self.frame]
guard let commandBuf: MTLCommandBuffer = queue.makeCommandBuffer() else {
throw RendererError.drawFailure("Failed to make command buffer from queue")
}
commandBuf.addCompletedHandler { _ in
self.inFlightSemaphore.signal()
}
guard let encoder = commandBuf.makeRenderCommandEncoder(descriptor: passDescription) else {
throw RendererError.drawFailure("Failed to make render encoder from command buffer")
}
@ -350,6 +362,11 @@ class Renderer {
encoder.endEncoding()
commandBuf.present(rt)
commandBuf.commit()
self.frame &+= 1
if self.frame == numFramesInFlight {
self.frame = 0
}
}
}