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：
代码语言：javascript复制/******************************************************************************************/
//@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二.效果演示
使用 GPUImageColorPackingFilter GPUImage 色彩丢失/模糊效果，原图：
**GPUImageColorPackingFilter GPUImage 色彩丢失/模糊效果，效果图：**
