iOS GPUImage 自定义美颜滤镜

示例代码：https://blog.csdn.net/m0_37677536/article/details/90439399
此滤镜有4个GPUImage自带滤镜合成可以自己修改效果参数
YHGPUImageBeautifyFilter.h

//
//  YHGPUImageBeautifyFilter.h
//  RecordVideo
//
//  Created by huizai on 2019/5/14.
//  Copyright © 2019 huizai. All rights reserved.
//#import "GPUImageFilterGroup.h"
#import "GPUImage.h"NS_ASSUME_NONNULL_BEGIN@class GPUImageCombinationFilter;@interface YHGPUImageBeautifyFilter : GPUImageFilterGroup{GPUImageBilateralFilter *bilateralFilter;GPUImageCannyEdgeDetectionFilter *cannyEdgeFilter;GPUImageCombinationFilter *combinationFilter;GPUImageHSBFilter *hsbFilter;
}@endNS_ASSUME_NONNULL_END

YHGPUImageBeautifyFilter.m

//
//  YHGPUImageBeautifyFilter.m
//  RecordVideo
//
//  Created by huizai on 2019/5/14.
//  Copyright © 2019 huizai. All rights reserved.
//#import "YHGPUImageBeautifyFilter.h"// Internal CombinationFilter(It should not be used outside)
@interface GPUImageCombinationFilter : GPUImageThreeInputFilter
{GLint smoothDegreeUniform;
}@property (nonatomic, assign) CGFloat intensity;@endNSString *const kGPUImageBeautifyFragmentShaderString = SHADER_STRING
(varying highp vec2 textureCoordinate;varying highp vec2 textureCoordinate2;varying highp vec2 textureCoordinate3;uniform sampler2D inputImageTexture;uniform sampler2D inputImageTexture2;uniform sampler2D inputImageTexture3;uniform mediump float smoothDegree;void main(){highp vec4 bilateral = texture2D(inputImageTexture, textureCoordinate);highp vec4 canny = texture2D(inputImageTexture2, textureCoordinate2);highp vec4 origin = texture2D(inputImageTexture3,textureCoordinate3);highp vec4 smooth;lowp float r = origin.r;lowp float g = origin.g;lowp float b = origin.b;if (canny.r < 0.2 && r > 0.3725 && g > 0.1568 && b > 0.0784 && r > b && (max(max(r, g), b) - min(min(r, g), b)) > 0.0588 && abs(r-g) > 0.0588) {smooth = (1.0 - smoothDegree) * (origin - bilateral) + bilateral;}else {smooth = origin;}smooth.r = log(1.0 + 0.2 * smooth.r)/log(1.2);smooth.g = log(1.0 + 0.2 * smooth.g)/log(1.2);smooth.b = log(1.0 + 0.2 * smooth.b)/log(1.2);gl_FragColor = smooth;});@implementation GPUImageCombinationFilter- (id)init {if (self = [super initWithFragmentShaderFromString:kGPUImageBeautifyFragmentShaderString]) {smoothDegreeUniform = [filterProgram uniformIndex:@"smoothDegree"];}self.intensity = 0.5;return self;
}- (void)setIntensity:(CGFloat)intensity {_intensity = intensity;[self setFloat:intensity forUniform:smoothDegreeUniform program:filterProgram];
}@end@implementation YHGPUImageBeautifyFilter- (id)init;
{if (!(self = [super init])){return nil;}// First pass: face smoothing filterbilateralFilter = [[GPUImageBilateralFilter alloc] init];bilateralFilter.distanceNormalizationFactor = 4.0;[self addFilter:bilateralFilter];// Second pass: edge detectioncannyEdgeFilter = [[GPUImageCannyEdgeDetectionFilter alloc] init];[self addFilter:cannyEdgeFilter];// Third pass: combination bilateral, edge detection and origincombinationFilter = [[GPUImageCombinationFilter alloc] init];[self addFilter:combinationFilter];// Adjust HSBhsbFilter = [[GPUImageHSBFilter alloc] init];[hsbFilter adjustBrightness:1.1];[hsbFilter adjustSaturation:1.1];[bilateralFilter addTarget:combinationFilter];[cannyEdgeFilter addTarget:combinationFilter];[combinationFilter addTarget:hsbFilter];self.initialFilters = [NSArray arrayWithObjects:bilateralFilter,cannyEdgeFilter,combinationFilter,nil];self.terminalFilter = hsbFilter;return self;
}#pragma mark -
#pragma mark GPUImageInput protocol- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
{for (GPUImageOutput<GPUImageInput> *currentFilter in self.initialFilters){if (currentFilter != self.inputFilterToIgnoreForUpdates){if (currentFilter == combinationFilter) {textureIndex = 2;}[currentFilter newFrameReadyAtTime:frameTime atIndex:textureIndex];}}
}- (void)setInputFramebuffer:(GPUImageFramebuffer *)newInputFramebuffer atIndex:(NSInteger)textureIndex;
{for (GPUImageOutput<GPUImageInput> *currentFilter in self.initialFilters){if (currentFilter == combinationFilter) {textureIndex = 2;}[currentFilter setInputFramebuffer:newInputFramebuffer atIndex:textureIndex];}
}@end

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