生成QT opengl 显示 yuv的代码

下面是一个简单的QT OpenGL显示YUV图像的示例代码：

#include <QtOpenGL/QGLWidget>
#include <QImage>
#include <QKeyEvent>

class YUVWidget : public QGLWidget
{
    Q_OBJECT

public:
    YUVWidget(QWidget *parent = nullptr);

protected:
    void initializeGL();
    void paintGL();
    void resizeGL(int w, int h);
    void keyPressEvent(QKeyEvent *event);

private:
    GLuint m_textureY;
    GLuint m_textureU;
    GLuint m_textureV;
    int m_width;
    int m_height;
    bool m_showY;
    bool m_showU;
    bool m_showV;
};

YUVWidget::YUVWidget(QWidget *parent) : QGLWidget(parent)
{
    m_textureY = 0;
    m_textureU = 0;
    m_textureV = 0;
    m_width = 0;
    m_height = 0;
    m_showY = true;
    m_showU = true;
    m_showV = true;
}

void YUVWidget::initializeGL()
{
    glEnable(GL_TEXTURE_2D);
    glShadeModel(GL_FLAT);

    glGenTextures(1, &m_textureY);
    glGenTextures(1, &m_textureU);
    glGenTextures(1, &m_textureV);
}

void YUVWidget::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    if (m_width > 0 && m_height > 0)
    {
        int halfWidth = m_width / 2;
        int halfHeight = m_height / 2;

        // 绑定纹理Y
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, m_textureY);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_width, m_height, GL_RED, GL_UNSIGNED_BYTE, yData);

        // 绑定纹理U
        glActiveTexture(GL_TEXTURE1);
        glBindTexture(GL_TEXTURE_2D, m_textureU);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, halfWidth, halfHeight, GL_RED, GL_UNSIGNED_BYTE, uData);

        // 绑定纹理V
        glActiveTexture(GL_TEXTURE2);
        glBindTexture(GL_TEXTURE_2D, m_textureV);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, halfWidth, halfHeight, GL_RED, GL_UNSIGNED_BYTE, vData);

        // 绘制图像
        glBegin(GL_QUADS);
        if (m_showY)
        {
            glTexCoord2f(0.0, 0.0);
            glVertex3f(-1.0, -1.0, 0.0);
            glTexCoord2f(1.0, 0.0);
            glVertex3f(0.0, -1.0, 0.0);
            glTexCoord2f(1.0, 1.0);
            glVertex3f(0.0, 0.0, 0.0);
            glTexCoord2f(0.0, 1.0);
            glVertex3f(-1.0, 0.0, 0.0);
        }
        if (m_showU)
        {
            glTexCoord2f(0.0, 0.0);
            glVertex3f(0.0, -1.0, 0.0);
            glTexCoord2f(1.0, 0.0);
            glVertex3f(1.0, -1.0, 0.0);
            glTexCoord2f(1.0, 1.0);
            glVertex3f(1.0, 0.0, 0.0);
            glTexCoord2f(0.0, 1.0);
            glVertex3f(0.0, 0.0, 0.0);
        }
        if (m_showV)
        {
            glTexCoord2f(0.0, 0.0);
            glVertex3f(-1.0, 0.0, 0.0);
            glTexCoord2f(1.0, 0.0);
            glVertex3f(0.0, 0.0, 0.0);
            glTexCoord2f(1.0, 1.0);
            glVertex3f(0.0, 1.0, 0.0);
            glTexCoord2f(0.0, 1.0);
            glVertex3f(-1.0, 1.0, 0.0);
        }
        glEnd();
    }
}

void YUVWidget::resizeGL(int w, int h)
{
    glViewport(0, 0, w, h);
}

void YUVWidget::keyPressEvent(QKeyEvent *event)
{
    if (event->key() == Qt::Key_Y)
    {
        m_showY = !m_showY;
        update();
    }
    else if (event->key() == Qt::Key_U)
    {
        m_showU = !m_showU;
        update();
    }
    else if (event->key() == Qt::Key_V)
    {
        m_showV = !m_showV;
        update();
    }
}

// 使用方法：
// 1. 创建YUVWidget对象
// 2. 在需要更新图像时，设置yData、uData、vData为图像数据，调用update()更新视图

在上述代码中，我们使用了OpenGL来绘制图像。我们需要创建三个纹理对象，分别用于存储Y、U、V分量的数据。在paintGL()函数中，我们首先绑定这三个纹理对象，并将图像数据传递给它们。然后，我们使用glBegin(GL_QUADS)和glVertex3f()函数来绘制图像。我们可以通过按下键盘上的Y、U、V键来切换是否显示对应的分量。