IOS – OpenGL ES 调节图像RGB通道 GPUImageRGBFilter

******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES 调节图像RGB通道 GPUImageRGBFilter
//@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 kGPUImageRGBFragmentShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;

 uniform sampler2D inputImageTexture;
 uniform highp float redAdjustment;
 uniform highp float greenAdjustment;
 uniform highp float blueAdjustment;

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

     gl_FragColor = vec4(textureColor.r * redAdjustment, textureColor.g * greenAdjustment, textureColor.b * blueAdjustment, textureColor.a);
 }
);
#else
NSString *const kGPUImageRGBFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;

 uniform sampler2D inputImageTexture;
 uniform float redAdjustment;
 uniform float greenAdjustment;
 uniform float blueAdjustment;

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

     gl_FragColor = vec4(textureColor.r * redAdjustment, textureColor.g * greenAdjustment, textureColor.b * blueAdjustment, textureColor.a);
 }
 );
#endif