IOS – OpenGL ES 色彩丢失/模糊效果 GPUImageColorPackingFilter

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.

**GPUImageColorPackingFilter GPUImage 色彩丢失/模糊效果，**shader 源码如下：

/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES 色彩丢失/模糊效果  GPUImageColorPackingFilter
//@Time:2022/05/26 06:30
//@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 kGPUImageColorPackingFragmentShaderString = SHADER_STRING
(precision lowp float;uniform sampler2D inputImageTexture;uniform mediump mat3 convolutionMatrix;varying highp vec2 outputTextureCoordinate;varying highp vec2 upperLeftInputTextureCoordinate;varying highp vec2 upperRightInputTextureCoordinate;varying highp vec2 lowerLeftInputTextureCoordinate;varying highp vec2 lowerRightInputTextureCoordinate;void main(){float upperLeftIntensity = texture2D(inputImageTexture, upperLeftInputTextureCoordinate).r;float upperRightIntensity = texture2D(inputImageTexture, upperRightInputTextureCoordinate).r;float lowerLeftIntensity = texture2D(inputImageTexture, lowerLeftInputTextureCoordinate).r;float lowerRightIntensity = texture2D(inputImageTexture, lowerRightInputTextureCoordinate).r;gl_FragColor = vec4(upperLeftIntensity, upperRightIntensity, lowerLeftIntensity, lowerRightIntensity);}
);
#else
NSString *const kGPUImageColorPackingFragmentShaderString = SHADER_STRING
(uniform sampler2D inputImageTexture;uniform mat3 convolutionMatrix;varying vec2 outputTextureCoordinate;varying vec2 upperLeftInputTextureCoordinate;varying vec2 upperRightInputTextureCoordinate;varying vec2 lowerLeftInputTextureCoordinate;varying vec2 lowerRightInputTextureCoordinate;void main(){float upperLeftIntensity = texture2D(inputImageTexture, upperLeftInputTextureCoordinate).r;float upperRightIntensity = texture2D(inputImageTexture, upperRightInputTextureCoordinate).r;float lowerLeftIntensity = texture2D(inputImageTexture, lowerLeftInputTextureCoordinate).r;float lowerRightIntensity = texture2D(inputImageTexture, lowerRightInputTextureCoordinate).r;gl_FragColor = vec4(upperLeftIntensity, upperRightIntensity, lowerLeftIntensity, lowerRightIntensity);}
);
#endif