滤镜效果
引入CoreImage
import CoreImage
import CoreImage.CIFilterBuiltins
确保输出材质采用设备支持的像素格式
extension RealityKit.ARView.PostProcessContext {
/// Returns the output texture, ensuring that the pixel format is appropriate for the current device's GPU.
var compatibleTargetTexture: MTLTexture! {
if self.device.supportsFamily(.apple2) {
return targetColorTexture
} else {
return targetColorTexture.makeTextureView(pixelFormat: .bgra8Unorm)!
}
}
}
声明一个CIContext
var ciContext: CIContext!
注册回调函数
func setupPostprocess() {
arView.renderCallbacks.prepareWithDevice = setupCoreImage(device:)
arView.renderCallbacks.postProcess = postProcessWithCoreImage(context:)
}
RealityKit加载完成在渲染第一帧前会调用prepareWithDevice一次, 可在此做耗时操作
func setupCoreImage(device: MTLDevice) {
// Create a CIContext and store it in a property.
ciContext = CIContext(mtlDevice: device)
// Do other expensive tasks, like loading images, here.
}
展示到屏幕之前每帧都会调用, 拒绝耗时操作
func postProcessWithCoreImage(context: ARView.PostProcessContext) {
// Create and configure the Core Image filter.
let filter = CIFilter.gammaAdjust()
filter.power = 4
// Convert the frame buffer from a Metal texture to a CIImage, and
// set the CIImage as the filter's input image.
guard let input = CIImage(mtlTexture: context.sourceColorTexture) else {
fatalError("Unable to create a CIImage from sourceColorTexture.")
}
filter.setValue(input, forKey: kCIInputImageKey)
// Get a reference to the filter's output image.
guard let output = filter.outputImage else {
fatalError("Error applying filter.")
}
// Create a render destination and render the filter to the context's command buffer.
let destination = CIRenderDestination(mtlTexture: context.compatibleTargetTexture,
commandBuffer: context.commandBuffer)
destination.isFlipped = false
_ = try? self.ciContext.startTask(toRender: output, to: destination)
}
苹果提供了十分多的filter
@available(iOS 13.0, *)
extension CIFilter {
// CICategoryGradient
open class func gaussianGradient() -> CIFilter & CIGaussianGradient
open class func hueSaturationValueGradient() -> CIFilter & CIHueSaturationValueGradient
open class func linearGradient() -> CIFilter & CILinearGradient
open class func radialGradient() -> CIFilter & CIRadialGradient
open class func smoothLinearGradient() -> CIFilter & CISmoothLinearGradient
// CICategorySharpen
open class func sharpenLuminance() -> CIFilter & CISharpenLuminance
open class func unsharpMask() -> CIFilter & CIUnsharpMask
// CICategoryHalftoneEffect
open class func circularScreen() -> CIFilter & CICircularScreen
open class func cmykHalftone() -> CIFilter & CICMYKHalftone
open class func dotScreen() -> CIFilter & CIDotScreen
open class func hatchedScreen() -> CIFilter & CIHatchedScreen
open class func lineScreen() -> CIFilter & CILineScreen
// CICategoryGeometryAdjustment
open class func bicubicScaleTransform() -> CIFilter & CIBicubicScaleTransform
open class func edgePreserveUpsample() -> CIFilter & CIEdgePreserveUpsample
open class func keystoneCorrectionCombined() -> CIFilter & CIKeystoneCorrectionCombined
open class func keystoneCorrectionHorizontal() -> CIFilter & CIKeystoneCorrectionHorizontal
open class func keystoneCorrectionVertical() -> CIFilter & CIKeystoneCorrectionVertical
open class func lanczosScaleTransform() -> CIFilter & CILanczosScaleTransform
open class func perspectiveCorrection() -> CIFilter & CIPerspectiveCorrection
open class func perspectiveRotate() -> CIFilter & CIPerspectiveRotate
open class func perspectiveTransform() -> CIFilter & CIPerspectiveTransform
open class func perspectiveTransformWithExtent() -> CIFilter & CIPerspectiveTransformWithExtent
open class func straighten() -> CIFilter & CIStraighten
// CICategoryTransition
open class func accordionFoldTransition() -> CIFilter & CIAccordionFoldTransition
open class func barsSwipeTransition() -> CIFilter & CIBarsSwipeTransition
open class func copyMachineTransition() -> CIFilter & CICopyMachineTransition
open class func disintegrateWithMaskTransition() -> CIFilter & CIDisintegrateWithMaskTransition
open class func dissolveTransition() -> CIFilter & CIDissolveTransition
open class func flashTransition() -> CIFilter & CIFlashTransition
open class func modTransition() -> CIFilter & CIModTransition
open class func pageCurlTransition() -> CIFilter & CIPageCurlTransition
open class func pageCurlWithShadowTransition() -> CIFilter & CIPageCurlWithShadowTransition
open class func rippleTransition() -> CIFilter & CIRippleTransition
open class func swipeTransition() -> CIFilter & CISwipeTransition
// CICategoryCompositeOperation
open class func additionCompositing() -> CIFilter & CICompositeOperation
open class func colorBlendMode() -> CIFilter & CICompositeOperation
open class func colorBurnBlendMode() -> CIFilter & CICompositeOperation
open class func colorDodgeBlendMode() -> CIFilter & CICompositeOperation
open class func darkenBlendMode() -> CIFilter & CICompositeOperation
open class func differenceBlendMode() -> CIFilter & CICompositeOperation
open class func divideBlendMode() -> CIFilter & CICompositeOperation
open class func exclusionBlendMode() -> CIFilter & CICompositeOperation
open class func hardLightBlendMode() -> CIFilter & CICompositeOperation
open class func hueBlendMode() -> CIFilter & CICompositeOperation
open class func lightenBlendMode() -> CIFilter & CICompositeOperation
open class func linearBurnBlendMode() -> CIFilter & CICompositeOperation
open class func linearDodgeBlendMode() -> CIFilter & CICompositeOperation
@available(iOS 15.0, *)
open class func linearLightBlendMode() -> CIFilter & CICompositeOperation
open class func luminosityBlendMode() -> CIFilter & CICompositeOperation
open class func maximumCompositing() -> CIFilter & CICompositeOperation
open class func minimumCompositing() -> CIFilter & CICompositeOperation
open class func multiplyBlendMode() -> CIFilter & CICompositeOperation
open class func multiplyCompositing() -> CIFilter & CICompositeOperation
open class func overlayBlendMode() -> CIFilter & CICompositeOperation
open class func pinLightBlendMode() -> CIFilter & CICompositeOperation
open class func saturationBlendMode() -> CIFilter & CICompositeOperation
open class func screenBlendMode() -> CIFilter & CICompositeOperation
open class func softLightBlendMode() -> CIFilter & CICompositeOperation
open class func sourceAtopCompositing() -> CIFilter & CICompositeOperation
open class func sourceInCompositing() -> CIFilter & CICompositeOperation
open class func sourceOutCompositing() -> CIFilter & CICompositeOperation
open class func sourceOverCompositing() -> CIFilter & CICompositeOperation
open class func subtractBlendMode() -> CIFilter & CICompositeOperation
@available(iOS 15.0, *)
open class func vividLightBlendMode() -> CIFilter & CICompositeOperation
// CICategoryColorAdjustment
@available(iOS 14.0, *)
open class func colorAbsoluteDifference() -> CIFilter & CIColorAbsoluteDifference
open class func colorClamp() -> CIFilter & CIColorClamp
open class func colorControls() -> CIFilter & CIColorControls
open class func colorMatrix() -> CIFilter & CIColorMatrix
open class func colorPolynomial() -> CIFilter & CIColorPolynomial
@available(iOS 14.0, *)
open class func colorThreshold() -> CIFilter & CIColorThreshold
@available(iOS 14.0, *)
open class func colorThresholdOtsu() -> CIFilter & CIColorThresholdOtsu
open class func depthToDisparity() -> CIFilter & CIDepthToDisparity
open class func disparityToDepth() -> CIFilter & CIDisparityToDepth
open class func exposureAdjust() -> CIFilter & CIExposureAdjust
open class func gammaAdjust() -> CIFilter & CIGammaAdjust
open class func hueAdjust() -> CIFilter & CIHueAdjust
open class func linearToSRGBToneCurve() -> CIFilter & CILinearToSRGBToneCurve
open class func sRGBToneCurveToLinear() -> CIFilter & CISRGBToneCurveToLinear
open class func temperatureAndTint() -> CIFilter & CITemperatureAndTint
open class func toneCurve() -> CIFilter & CIToneCurve
open class func vibrance() -> CIFilter & CIVibrance
open class func whitePointAdjust() -> CIFilter & CIWhitePointAdjust
// CICategoryColorEffect
open class func colorCrossPolynomial() -> CIFilter & CIColorCrossPolynomial
open class func colorCube() -> CIFilter & CIColorCube
open class func colorCubesMixedWithMask() -> CIFilter & CIColorCubesMixedWithMask
open class func colorCubeWithColorSpace() -> CIFilter & CIColorCubeWithColorSpace
open class func colorCurves() -> CIFilter & CIColorCurves
open class func colorInvert() -> CIFilter & CIColorInvert
open class func colorMap() -> CIFilter & CIColorMap
open class func colorMonochrome() -> CIFilter & CIColorMonochrome
open class func colorPosterize() -> CIFilter & CIColorPosterize
@available(iOS 16.0, *)
open class func convertLabToRGB() -> CIFilter & CIConvertLab
@available(iOS 16.0, *)
open class func convertRGBtoLab() -> CIFilter & CIConvertLab
open class func dither() -> CIFilter & CIDither
open class func documentEnhancer() -> CIFilter & CIDocumentEnhancer
open class func falseColor() -> CIFilter & CIFalseColor
open class func labDeltaE() -> CIFilter & CILabDeltaE
open class func maskToAlpha() -> CIFilter & CIMaskToAlpha
open class func maximumComponent() -> CIFilter & CIMaximumComponent
open class func minimumComponent() -> CIFilter & CIMinimumComponent
open class func paletteCentroid() -> CIFilter & CIPaletteCentroid
open class func palettize() -> CIFilter & CIPalettize
open class func photoEffectChrome() -> CIFilter & CIPhotoEffect
open class func photoEffectFade() -> CIFilter & CIPhotoEffect
open class func photoEffectInstant() -> CIFilter & CIPhotoEffect
open class func photoEffectMono() -> CIFilter & CIPhotoEffect
open class func photoEffectNoir() -> CIFilter & CIPhotoEffect
open class func photoEffectProcess() -> CIFilter & CIPhotoEffect
open class func photoEffectTonal() -> CIFilter & CIPhotoEffect
open class func photoEffectTransfer() -> CIFilter & CIPhotoEffect
open class func sepiaTone() -> CIFilter & CISepiaTone
open class func thermal() -> CIFilter & CIThermal
open class func vignette() -> CIFilter & CIVignette
open class func vignetteEffect() -> CIFilter & CIVignetteEffect
open class func xRay() -> CIFilter & CIXRay
// CICategoryDistortionEffect
@available(iOS 14.0, *)
open class func bumpDistortion() -> CIFilter & CIBumpDistortion
@available(iOS 14.0, *)
open class func bumpDistortionLinear() -> CIFilter & CIBumpDistortionLinear
@available(iOS 14.0, *)
open class func circleSplashDistortion() -> CIFilter & CICircleSplashDistortion
@available(iOS 14.0, *)
open class func circularWrap() -> CIFilter & CICircularWrap
@available(iOS 14.0, *)
open class func displacementDistortion() -> CIFilter & CIDisplacementDistortion
@available(iOS 14.0, *)
open class func droste() -> CIFilter & CIDroste
@available(iOS 14.0, *)
open class func glassDistortion() -> CIFilter & CIGlassDistortion
@available(iOS 14.0, *)
open class func glassLozenge() -> CIFilter & CIGlassLozenge
@available(iOS 14.0, *)
open class func holeDistortion() -> CIFilter & CIHoleDistortion
@available(iOS 14.0, *)
open class func lightTunnel() -> CIFilter & CILightTunnel
@available(iOS 14.0, *)
open class func ninePartStretched() -> CIFilter & CINinePartStretched
@available(iOS 14.0, *)
open class func ninePartTiled() -> CIFilter & CINinePartTiled
@available(iOS 14.0, *)
open class func pinchDistortion() -> CIFilter & CIPinchDistortion
@available(iOS 14.0, *)
open class func stretchCrop() -> CIFilter & CIStretchCrop
@available(iOS 14.0, *)
open class func torusLensDistortion() -> CIFilter & CITorusLensDistortion
@available(iOS 14.0, *)
open class func twirlDistortion() -> CIFilter & CITwirlDistortion
@available(iOS 14.0, *)
open class func vortexDistortion() -> CIFilter & CIVortexDistortion
// CICategoryTileEffect
open class func affineClamp() -> CIFilter & CIAffineClamp
open class func affineTile() -> CIFilter & CIAffineTile
open class func eightfoldReflectedTile() -> CIFilter & CIEightfoldReflectedTile
open class func fourfoldReflectedTile() -> CIFilter & CIFourfoldReflectedTile
open class func fourfoldRotatedTile() -> CIFilter & CIFourfoldRotatedTile
open class func fourfoldTranslatedTile() -> CIFilter & CIFourfoldTranslatedTile
open class func glideReflectedTile() -> CIFilter & CIGlideReflectedTile
open class func kaleidoscope() -> CIFilter & CIKaleidoscope
open class func opTile() -> CIFilter & CIOpTile
open class func parallelogramTile() -> CIFilter & CIParallelogramTile
open class func perspectiveTile() -> CIFilter & CIPerspectiveTile
open class func sixfoldReflectedTile() -> CIFilter & CISixfoldReflectedTile
open class func sixfoldRotatedTile() -> CIFilter & CISixfoldRotatedTile
open class func triangleKaleidoscope() -> CIFilter & CITriangleKaleidoscope
open class func triangleTile() -> CIFilter & CITriangleTile
open class func twelvefoldReflectedTile() -> CIFilter & CITwelvefoldReflectedTile
// CICategoryGenerator
open class func attributedTextImageGenerator() -> CIFilter & CIAttributedTextImageGenerator
open class func aztecCodeGenerator() -> CIFilter & CIAztecCodeGenerator
open class func barcodeGenerator() -> CIFilter & CIBarcodeGenerator
open class func checkerboardGenerator() -> CIFilter & CICheckerboardGenerator
open class func code128BarcodeGenerator() -> CIFilter & CICode128BarcodeGenerator
open class func lenticularHaloGenerator() -> CIFilter & CILenticularHaloGenerator
open class func meshGenerator() -> CIFilter & CIMeshGenerator
open class func pdf417BarcodeGenerator() -> CIFilter & CIPDF417BarcodeGenerator
open class func qrCodeGenerator() -> CIFilter & CIQRCodeGenerator
open class func randomGenerator() -> CIFilter & CIRandomGenerator
open class func roundedRectangleGenerator() -> CIFilter & CIRoundedRectangleGenerator
open class func starShineGenerator() -> CIFilter & CIStarShineGenerator
open class func stripesGenerator() -> CIFilter & CIStripesGenerator
open class func sunbeamsGenerator() -> CIFilter & CISunbeamsGenerator
open class func textImageGenerator() -> CIFilter & CITextImageGenerator
// CICategoryStylize
open class func blendWithAlphaMask() -> CIFilter & CIBlendWithMask
open class func blendWithBlueMask() -> CIFilter & CIBlendWithMask
open class func blendWithMask() -> CIFilter & CIBlendWithMask
open class func blendWithRedMask() -> CIFilter & CIBlendWithMask
open class func bloom() -> CIFilter & CIBloom
open class func comicEffect() -> CIFilter & CIComicEffect
open class func convolution3X3() -> CIFilter & CIConvolution
open class func convolution5X5() -> CIFilter & CIConvolution
open class func convolution7X7() -> CIFilter & CIConvolution
open class func convolution9Horizontal() -> CIFilter & CIConvolution
open class func convolution9Vertical() -> CIFilter & CIConvolution
@available(iOS 15.0, *)
open class func convolutionRGB3X3() -> CIFilter & CIConvolution
@available(iOS 15.0, *)
open class func convolutionRGB5X5() -> CIFilter & CIConvolution
@available(iOS 15.0, *)
open class func convolutionRGB7X7() -> CIFilter & CIConvolution
@available(iOS 15.0, *)
open class func convolutionRGB9Horizontal() -> CIFilter & CIConvolution
@available(iOS 15.0, *)
open class func convolutionRGB9Vertical() -> CIFilter & CIConvolution
open class func coreMLModel() -> CIFilter & CICoreMLModel
open class func crystallize() -> CIFilter & CICrystallize
open class func depthOfField() -> CIFilter & CIDepthOfField
open class func edges() -> CIFilter & CIEdges
open class func edgeWork() -> CIFilter & CIEdgeWork
open class func gaborGradients() -> CIFilter & CIGaborGradients
open class func gloom() -> CIFilter & CIGloom
open class func heightFieldFromMask() -> CIFilter & CIHeightFieldFromMask
open class func hexagonalPixellate() -> CIFilter & CIHexagonalPixellate
open class func highlightShadowAdjust() -> CIFilter & CIHighlightShadowAdjust
open class func lineOverlay() -> CIFilter & CILineOverlay
open class func mix() -> CIFilter & CIMix
@available(iOS 15.0, *)
open class func personSegmentation() -> CIFilter & CIPersonSegmentation
open class func pixellate() -> CIFilter & CIPixellate
open class func pointillize() -> CIFilter & CIPointillize
open class func saliencyMap() -> CIFilter & CISaliencyMap
open class func shadedMaterial() -> CIFilter & CIShadedMaterial
open class func spotColor() -> CIFilter & CISpotColor
open class func spotLight() -> CIFilter & CISpotLight
// CICategoryBlur
open class func bokehBlur() -> CIFilter & CIBokehBlur
open class func boxBlur() -> CIFilter & CIBoxBlur
open class func discBlur() -> CIFilter & CIDiscBlur
open class func gaussianBlur() -> CIFilter & CIGaussianBlur
open class func maskedVariableBlur() -> CIFilter & CIMaskedVariableBlur
open class func median() -> CIFilter & CIMedian
open class func morphologyGradient() -> CIFilter & CIMorphologyGradient
open class func morphologyMaximum() -> CIFilter & CIMorphologyMaximum
open class func morphologyMinimum() -> CIFilter & CIMorphologyMinimum
open class func morphologyRectangleMaximum() -> CIFilter & CIMorphologyRectangleMaximum
open class func morphologyRectangleMinimum() -> CIFilter & CIMorphologyRectangleMinimum
open class func motionBlur() -> CIFilter & CIMotionBlur
open class func noiseReduction() -> CIFilter & CINoiseReduction
open class func zoomBlur() -> CIFilter & CIZoomBlur
// CICategoryReduction
@available(iOS 14.0, *)
open class func areaAverage() -> CIFilter & CIAreaAverage
@available(iOS 14.0, *)
open class func areaHistogram() -> CIFilter & CIAreaHistogram
@available(iOS 16.0, *)
open class func areaLogarithmicHistogram() -> CIFilter & CIAreaLogarithmicHistogram
@available(iOS 14.0, *)
open class func areaMaximum() -> CIFilter & CIAreaMaximum
@available(iOS 14.0, *)
open class func areaMaximumAlpha() -> CIFilter & CIAreaMaximumAlpha
@available(iOS 14.0, *)
open class func areaMinimum() -> CIFilter & CIAreaMinimum
@available(iOS 14.0, *)
open class func areaMinimumAlpha() -> CIFilter & CIAreaMinimumAlpha
@available(iOS 14.0, *)
open class func areaMinMax() -> CIFilter & CIAreaMinMax
@available(iOS 14.0, *)
open class func areaMinMaxRed() -> CIFilter & CIAreaMinMaxRed
@available(iOS 14.0, *)
open class func columnAverage() -> CIFilter & CIColumnAverage
@available(iOS 14.0, *)
open class func histogramDisplay() -> CIFilter & CIHistogramDisplay
@available(iOS 14.0, *)
open class func kMeans() -> CIFilter & CIKMeans
@available(iOS 14.0, *)
open class func rowAverage() -> CIFilter & CIRowAverage
}