IOS – OpenGL ES 调节图像不透明度 GPUImageOpacityFilter

原创

猿说编程[Python和C]

发布于 2023-03-19 09:47:49

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发布于 2023-03-19 09:47:49

文章被收录于专栏：猿说编程猿说编程

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.

GPUImageOpacityFilter 属于 GPUImage 颜色处理相关，用来处理图片不透明度，shader 源码如下：

/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES 调节图像不透明度 GPUImageOpacityFilter
//@Time:2022/03/17 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！
/******************************************************************************************/



#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageOpacityFragmentShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;

 uniform sampler2D inputImageTexture;
 uniform lowp float opacity;

 void main()
 {
     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);

     gl_FragColor = vec4(textureColor.rgb, textureColor.a * opacity);
 }
);
#else
NSString *const kGPUImageOpacityFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;

 uniform sampler2D inputImageTexture;
 uniform float opacity;

 void main()
 {
     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);

     gl_FragColor = vec4(textureColor.rgb, textureColor.a * opacity);
 }
);
#endif