IOS OpenGL ES GPUImage 色度键混合 GPUImageChromaKeyBlendFilter - ToB企服应用市场:ToB评测及商务社交产业平台

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//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES GPUImage GPUImageChromaKeyBlendFilter
//@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！
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#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageChromaKeyBlendFragmentShaderString = SHADER_STRING
(
precision highp float;
varying highp vec2 textureCoordinate;
varying highp vec2 textureCoordinate2;
uniform float thresholdSensitivity;
uniform float smoothing;
uniform vec3 colorToReplace;
uniform sampler2D inputImageTexture;
uniform sampler2D inputImageTexture2;
void main()
{
vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
float maskY = 0.2989 * colorToReplace.r + 0.5866 * colorToReplace.g + 0.1145 * colorToReplace.b;
float maskCr = 0.7132 * (colorToReplace.r - maskY);
float maskCb = 0.5647 * (colorToReplace.b - maskY);
float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
float Cr = 0.7132 * (textureColor.r - Y);
float Cb = 0.5647 * (textureColor.b - Y);
// float blendValue = 1.0 - smoothstep(thresholdSensitivity - smoothing, thresholdSensitivity , abs(Cr - maskCr) + abs(Cb - maskCb));
float blendValue = 1.0 - smoothstep(thresholdSensitivity, thresholdSensitivity + smoothing, distance(vec2(Cr, Cb), vec2(maskCr, maskCb)));
gl_FragColor = mix(textureColor, textureColor2, blendValue);
}
);
#else
NSString *const kGPUImageChromaKeyBlendFragmentShaderString = SHADER_STRING
(
varying vec2 textureCoordinate;
varying vec2 textureCoordinate2;
uniform float thresholdSensitivity;
uniform float smoothing;
uniform vec3 colorToReplace;
uniform sampler2D inputImageTexture;
uniform sampler2D inputImageTexture2;
void main()
{
vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
float maskY = 0.2989 * colorToReplace.r + 0.5866 * colorToReplace.g + 0.1145 * colorToReplace.b;
float maskCr = 0.7132 * (colorToReplace.r - maskY);
float maskCb = 0.5647 * (colorToReplace.b - maskY);
float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
float Cr = 0.7132 * (textureColor.r - Y);
float Cb = 0.5647 * (textureColor.b - Y);
// float blendValue = 1.0 - smoothstep(thresholdSensitivity - smoothing, thresholdSensitivity , abs(Cr - maskCr) + abs(Cb - maskCb));
float blendValue = 1.0 - smoothstep(thresholdSensitivity, thresholdSensitivity + smoothing, distance(vec2(Cr, Cb), vec2(maskCr, maskCb)));
gl_FragColor = mix(textureColor, textureColor2, blendValue);
}
);
#endif

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