OpenGL——OpenCV读取图片进行纹理贴图

    img = imread(m_fileName);

    if (img.empty())
    {
        fprintf(stderr, "Can not load image %s\n", m_fileName);
        return -1;
    }
    //设置长宽
    int width = img.cols;
    int height = img.rows;
    int channel = img.channels();
    printf(" depth  %d\n", channel);

    //获取图像指针
    int pixellength = width * height * channel;
    pixels = new GLubyte[pixellength];
    memcpy(pixels, img.data, pixellength * sizeof(char));
    //imshow("OpenCV", img);
    

    glGenTextures(1, &m_textureObj);
    glBindTexture(m_textureTarget, m_textureObj);
    //必须一个RGB  一个BGR（opencv的mat类的颜色通道是BGR） 否则会出现颜色偏差
    glTexImage2D(m_textureTarget, 0, GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, pixels);
    //纹理放大缩小使用线性插值
    glTexParameterf(m_textureTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(m_textureTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    
    glBindTexture(m_textureTarget, 0);
    free(pixels);