GPUImage – 纯色 GPUImageSolidColorGenerator

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//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:GPUImage – 纯色 GPUImageSolidColorGenerator
//@Time:2022/03/28 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 kGPUSolidColorFragmentShaderString = SHADER_STRING
(
 precision lowp float;

 varying highp vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform vec4 color;
 uniform float useExistingAlpha;

 void main()
 {
     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
     gl_FragColor = vec4(color.rgb, max(textureColor.a, 1.0 - useExistingAlpha));
 }
 );
#else
NSString *const kGPUSolidColorFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform vec4 color;
 uniform float useExistingAlpha;

 void main()
 {
     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
     gl_FragColor = vec4(color.rgb, max(textureColor.a, 1.0 - useExistingAlpha));
 }
 );
#endif