IOS – OpenGL ES 卡通效果（黑色粗线描边） GPUImageToonFilter

一.简介
二.效果演示
三.源码下载
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一.简介

GPUImage 共 125 个滤镜, 分为四类

1、Color adjustments : 31 filters , 颜色处理相关
2、Image processing : 40 filters , 图像处理相关.
3、Blending modes : 29 filters , 混合模式相关.
4、Visual effects : 25 filters , 视觉效果相关.

**GPUImageToonFilter 属于 GPUImage 图像处理相关，用来图像卡通效果（黑色粗线描边），**shader 源码如下：

******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES 卡通效果（黑色粗线描边） GPUImageToonFilter
//@Time:2022/05/14 10:30
//@Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！
/******************************************************************************************/#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageToonFragmentShaderString = SHADER_STRING
(precision highp float;varying vec2 textureCoordinate;varying vec2 leftTextureCoordinate;varying vec2 rightTextureCoordinate;varying vec2 topTextureCoordinate;varying vec2 topLeftTextureCoordinate;varying vec2 topRightTextureCoordinate;varying vec2 bottomTextureCoordinate;varying vec2 bottomLeftTextureCoordinate;varying vec2 bottomRightTextureCoordinate;uniform sampler2D inputImageTexture;uniform highp float intensity;uniform highp float threshold;uniform highp float quantizationLevels;const highp vec3 W = vec3(0.2125, 0.7154, 0.0721);void main(){vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;float h = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;float v = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;float mag = length(vec2(h, v));vec3 posterizedImageColor = floor((textureColor.rgb * quantizationLevels) + 0.5) / quantizationLevels;float thresholdTest = 1.0 - step(threshold, mag);gl_FragColor = vec4(posterizedImageColor * thresholdTest, textureColor.a);}
);
#else
NSString *const kGPUImageToonFragmentShaderString = SHADER_STRING
(varying vec2 textureCoordinate;varying vec2 leftTextureCoordinate;varying vec2 rightTextureCoordinate;varying vec2 topTextureCoordinate;varying vec2 topLeftTextureCoordinate;varying vec2 topRightTextureCoordinate;varying vec2 bottomTextureCoordinate;varying vec2 bottomLeftTextureCoordinate;varying vec2 bottomRightTextureCoordinate;uniform sampler2D inputImageTexture;uniform float intensity;uniform float threshold;uniform float quantizationLevels;const vec3 W = vec3(0.2125, 0.7154, 0.0721);void main(){vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;float h = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;float v = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;float mag = length(vec2(h, v));vec3 posterizedImageColor = floor((textureColor.rgb * quantizationLevels) + 0.5) / quantizationLevels;float thresholdTest = 1.0 - step(threshold, mag);gl_FragColor = vec4(posterizedImageColor * thresholdTest, textureColor.a);}
);
#endif