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Split ComputeFilter from AbstractFilter
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| // | ||
| // AbstractComputeFilter.swift | ||
| // Slate | ||
| // | ||
| // Created by John Coates on 10/13/16. | ||
| // Copyright © 2016 John Coates. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import MetalKit | ||
|
|
||
| class ComputeFilter: AbstractFilter { | ||
| override init(device: MTLDevice) { | ||
| super.init(device: device) | ||
| buildPipeline() | ||
| } | ||
|
|
||
| func buildPipeline() { | ||
| fatalError("Filter \(self) must implement buildPipeline()") | ||
| } | ||
|
|
||
| // MARK: - Textures | ||
|
|
||
| fileprivate var outputTexture: MTLTexture? | ||
| func outputTexture(forInputTexture inputTexture: MTLTexture) -> MTLTexture { | ||
| if let outputTexture = outputTexture { | ||
| if outputTexture.width == inputTexture.width, outputTexture.height == inputTexture.height { | ||
| return outputTexture | ||
| } | ||
|
|
||
| } | ||
| let descriptor = MTLTextureDescriptor.texture2DDescriptor(pixelFormat: .bgra8Unorm, | ||
| width: inputTexture.width, | ||
| height: inputTexture.height, | ||
| mipmapped: false) | ||
| descriptor.usage = [.shaderRead, .shaderWrite, .renderTarget] | ||
| let texture = device.makeTexture(descriptor: descriptor) | ||
| outputTexture = texture | ||
| return texture | ||
| } | ||
|
|
||
| // MARK: - Thread Groups | ||
|
|
||
| // TODO: check device.maxThreadsPerThreadgroup | ||
| lazy var threadsPerGroup: MTLSize = MTLSize(width: 22, height: 22, depth: 1) | ||
| fileprivate var threadGroups: MTLSize? | ||
| fileprivate var threadTextureSize: MTLSize? | ||
| func threadGroups(forInputTexture inputTexture: MTLTexture) -> MTLSize { | ||
| if let threadGroups = threadGroups, let threadTextureSize = threadTextureSize { | ||
| if threadTextureSize.width == inputTexture.width, | ||
| threadTextureSize.height == inputTexture.height { | ||
| return threadGroups | ||
| } | ||
| } | ||
| let widthSteps = inputTexture.width / threadsPerGroup.width | ||
| let heightSteps = inputTexture.height / threadsPerGroup.height | ||
| let groups = MTLSizeMake(widthSteps, heightSteps, 1) | ||
| threadGroups = groups | ||
| threadTextureSize = MTLSize(width: inputTexture.width, | ||
| height: inputTexture.height, | ||
| depth: inputTexture.depth) | ||
| return groups | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| // | ||
| // AbstractFragmentFilter.swift | ||
| // Slate | ||
| // | ||
| // Created by John Coates on 10/13/16. | ||
| // Copyright © 2016 John Coates. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation |
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