IOS OpenGL ES GPUImage 遮罩混合 GPUImageMaskFilter

一.简介
二.效果演示
三.源码下载
四.猜你喜欢

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零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES GPUImage 使用

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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.

GPUImageMaskFilter属于 GPUImage 混合模式相关，用于图像遮罩混合。shader 源码如下：

/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES GPUImage GPUImageMaskFilter
//@Time:2022/07/16 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 kGPUImageMaskShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;
 varying highp vec2 textureCoordinate2;

 uniform sampler2D inputImageTexture;
 uniform sampler2D inputImageTexture2;

 void main()
 {
	 lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
	 lowp vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);

	 //Averages mask's the RGB values, and scales that value by the mask's alpha
	 //
	 //The dot product should take fewer cycles than doing an average normally
	 //
	 //Typical/ideal case, R,G, and B will be the same, and Alpha will be 1.0
	 lowp float newAlpha = dot(textureColor2.rgb, vec3(.33333334, .33333334, .33333334)) * textureColor2.a;

	 gl_FragColor = vec4(textureColor.xyz, newAlpha);
//	 gl_FragColor = vec4(textureColor2);
 }
);
#else
NSString *const kGPUImageMaskShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 varying vec2 textureCoordinate2;

 uniform sampler2D inputImageTexture;
 uniform sampler2D inputImageTexture2;

 void main()
 {
	 vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
	 vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);

	 //Averages mask's the RGB values, and scales that value by the mask's alpha
	 //
	 //The dot product should take fewer cycles than doing an average normally
	 //
	 //Typical/ideal case, R,G, and B will be the same, and Alpha will be 1.0
	 float newAlpha = dot(textureColor2.rgb, vec3(.33333334, .33333334, .33333334)) * textureColor2.a;

	 gl_FragColor = vec4(textureColor.xyz, newAlpha);
     //	 gl_FragColor = vec4(textureColor2);
 }
);
#endif