Mat画像をImGuiで表示したときのやつ

cv::Mat to GLTexture

void ConvertMatToGL(const cv::Mat& src,GLuint* texID){
    if(src.empty() == true)
        return;

    glDeleteTextures(1, texID);
    glPixelStorei(GL_UNPACK_ALIGNMENT,1);
    glGenTextures(1, texID);
    glBindTexture(GL_TEXTURE_2D, *texID);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    if(src.channels() == 4){
        glTexImage2D(
                     GL_TEXTURE_2D,
                     0,
                     GL_RGBA,
                     src.cols, src.rows,
                     0,
                     GL_RGBA,
                     GL_UNSIGNED_BYTE,
                     src.ptr<unsigned char>()
                     );
    }else if(src.channels() == 3){
        glTexImage2D(
                     GL_TEXTURE_2D,
                     0,
                     GL_RGB,
                     src.cols, src.rows,
                     0,
                     GL_RGB,
                     GL_UNSIGNED_BYTE,
                     src.ptr<unsigned char>()
                     );
    }else if(src.channels() == 1){
        glTexImage2D(
                     GL_TEXTURE_2D,
                     0,
                     GL_LUMINANCE,
                     src.cols, src.rows,
                     0,
                     GL_LUMINANCE,
                     GL_UNSIGNED_BYTE,
                     src.ptr<unsigned char>()
                     );
    }else{
        ofLog() << "other channel !";
    }
}