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improved & simplified depth occlusion feathering in AR PBR Example, a…
…dded ARFeatheredDepthMaskGenerator
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99
Example/Example/Utilities/AR/ARFeatheredDepthMaskGenerator.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // | ||
| // ARDepthMaskStencilGenerator.swift | ||
| // Example | ||
| // | ||
| // Created by Reza Ali on 5/15/23. | ||
| // Copyright © 2023 Hi-Rez. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import Metal | ||
| import MetalPerformanceShaders | ||
|
|
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| class ARFeatheredDepthMaskGenerator { | ||
| private var device: MTLDevice | ||
| private var pixelFormat: MTLPixelFormat | ||
| private var textureScale: Int | ||
|
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| private var depthMaskGenerator: ARDepthMaskGenerator | ||
| private var scaleFilter: MPSImageBilinearScale | ||
| private var blurFilter: MPSImageGaussianBlur | ||
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| private var _updateTextures = true | ||
| private var texture: MTLTexture? | ||
| private var scaledTexture: MTLTexture? | ||
|
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| public init(device: MTLDevice, pixelFormat: MTLPixelFormat, textureScale: Int, blurSigma: Float) { | ||
| self.device = device | ||
| self.pixelFormat = pixelFormat | ||
| self.textureScale = textureScale | ||
|
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| depthMaskGenerator = ARDepthMaskGenerator(device: device, width: 1, height: 1, pixelFormat: pixelFormat) | ||
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| scaleFilter = MPSImageBilinearScale(device: device) | ||
| blurFilter = MPSImageGaussianBlur(device: device, sigma: blurSigma) | ||
| blurFilter.edgeMode = .clamp | ||
| } | ||
|
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| public func encode(commandBuffer: MTLCommandBuffer, realDepthTexture: MTLTexture, virtualDepthTexture: MTLTexture) -> MTLTexture? { | ||
| if _updateTextures { | ||
| texture = createTexture( | ||
| label: "Feathered Depth Mask Texture", | ||
| pixelFormat: pixelFormat, | ||
| width: realDepthTexture.width, | ||
| height: realDepthTexture.height, | ||
| textureScale: textureScale | ||
| ) | ||
|
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| scaledTexture = createTexture( | ||
| label: "Feathered Scaled Depth Mask Texture", | ||
| pixelFormat: pixelFormat, | ||
| width: realDepthTexture.width, | ||
| height: realDepthTexture.height, | ||
| textureScale: textureScale | ||
| ) | ||
| _updateTextures = false | ||
| } | ||
|
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| if let depthMaskTexture = depthMaskGenerator.encode( | ||
| commandBuffer: commandBuffer, | ||
| realDepthTexture: realDepthTexture, | ||
| virtualDepthTexture: virtualDepthTexture | ||
| ), let texture = texture, let scaledTexture = scaledTexture { | ||
| scaleFilter.encode( | ||
| commandBuffer: commandBuffer, | ||
| sourceTexture: depthMaskTexture, | ||
| destinationTexture: scaledTexture | ||
| ) | ||
|
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| blurFilter.encode( | ||
| commandBuffer: commandBuffer, | ||
| sourceTexture: scaledTexture, | ||
| destinationTexture: texture | ||
| ) | ||
| } | ||
|
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| return texture | ||
| } | ||
|
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| public func resize(_ size: (width: Float, height: Float)) { | ||
| depthMaskGenerator.resize(size) | ||
| _updateTextures = true | ||
| } | ||
|
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| private func createTexture(label: String, pixelFormat: MTLPixelFormat, width: Int, height: Int, textureScale: Int) -> MTLTexture? { | ||
| guard width > 0, height > 0 else { return nil } | ||
| let descriptor = MTLTextureDescriptor() | ||
| descriptor.pixelFormat = pixelFormat | ||
| descriptor.width = width / textureScale | ||
| descriptor.height = height / textureScale | ||
| descriptor.sampleCount = 1 | ||
| descriptor.textureType = .type2D | ||
| descriptor.usage = [.renderTarget, .shaderRead, .shaderWrite] | ||
| descriptor.storageMode = .private | ||
| descriptor.resourceOptions = .storageModePrivate | ||
| guard let texture = device.makeTexture(descriptor: descriptor) else { return nil } | ||
| texture.label = label | ||
| return texture | ||
| } | ||
| } |
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