IOS – OpenGL ES 设置图像反遮罩锐化 GPUImageUnsharpMaskFilter

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//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES  设置图像反遮罩锐化 GPUImageUnsharpMaskFilterGPUImageLocalBinaryPatternFilter
//@Time:2022/04/23 07:30
//@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！
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#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageUnsharpMaskFragmentShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;
 varying highp vec2 textureCoordinate2;

 uniform sampler2D inputImageTexture;
 uniform sampler2D inputImageTexture2;

 uniform highp float intensity;

 void main()
 {
     lowp vec4 sharpImageColor = texture2D(inputImageTexture, textureCoordinate);
     lowp vec3 blurredImageColor = texture2D(inputImageTexture2, textureCoordinate2).rgb;

     gl_FragColor = vec4(sharpImageColor.rgb * intensity + blurredImageColor * (1.0 - intensity), sharpImageColor.a);
//     gl_FragColor = mix(blurredImageColor, sharpImageColor, intensity);
//     gl_FragColor = vec4(sharpImageColor.rgb - (blurredImageColor.rgb * intensity), 1.0);
 }
);
#else
NSString *const kGPUImageUnsharpMaskFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 varying vec2 textureCoordinate2;

 uniform sampler2D inputImageTexture;
 uniform sampler2D inputImageTexture2;

 uniform float intensity;

 void main()
 {
     vec4 sharpImageColor = texture2D(inputImageTexture, textureCoordinate);
     vec3 blurredImageColor = texture2D(inputImageTexture2, textureCoordinate2).rgb;

     gl_FragColor = vec4(sharpImageColor.rgb * intensity + blurredImageColor * (1.0 - intensity), sharpImageColor.a);
     //     gl_FragColor = mix(blurredImageColor, sharpImageColor, intensity);
     //     gl_FragColor = vec4(sharpImageColor.rgb - (blurredImageColor.rgb * intensity), 1.0);
 }
);
#endif