#include "PlayerGLWidget.h"


PlayerGLWidget::PlayerGLWidget(QWidget *parent) : QOpenGLWidget(parent)
{

}

PlayerGLWidget::~PlayerGLWidget()
{

}

/* 刷新一帧 */
void PlayerGLWidget::updateFrame(Image_YUV420& image)
{
    // yData = image.yData;
    // uData = image.uData;
    // vData = image.vData;
    update();
}

/* 刷新一帧QImage */
void PlayerGLWidget::updateFrame(Image_QImage& image)
{
    m_image = image;

    imageData_ = m_image.image.bits();
    imageSize_.setWidth(m_image.width);
    imageSize_.setHeight(m_image.height);
    update();
}

void PlayerGLWidget::initializeGL()
{
    initializeOpenGLFunctions();
    texture_ = new QOpenGLTexture(QOpenGLTexture::Target2D);

    texture_->create();
    textureId_ = texture_->textureId();
    glBindTexture(GL_TEXTURE_2D, textureId_);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

}

void PlayerGLWidget::resizeGL(int w, int h)
{
    Ortho2DSize_.setWidth(w);
    Ortho2DSize_.setHeight(h);
    glViewport(0,0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, Ortho2DSize_.width(), Ortho2DSize_.height(), 0, -1, 1);
    glMatrixMode(GL_MODELVIEW);

}

void PlayerGLWidget::paintGL()
{
    static bool initTextureFlag = false;
    // initializeOpenGLFunctions(); // 初始化 OpenGL 函数

    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    if(imageData_ == nullptr){
        return;
    }

    //QByteArray ba((const char*)imageData_,64);
    //qDebug() <<imageData_ << ba;
    glBindTexture(GL_TEXTURE_2D, textureId_);

    if(!initTextureFlag){
        // 首次显示纹理
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageSize_.width(), imageSize_.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData_);
        initTextureFlag = true;
    }
    else{
        // 动态修改纹理数据
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, imageSize_.width(), imageSize_.height(), GL_RGBA, GL_UNSIGNED_BYTE, imageData_);
        //glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageSize_.width(), imageSize_.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData_);
    }

    glEnable(GL_TEXTURE_2D);
    glBegin(GL_POLYGON);

    //顶点坐标和纹理坐标必须一一对应
    glTexCoord2d(0.0f, 0.0f);
    glVertex2d(0, 0);
    glTexCoord2d(0.0f, 1.0f);
    glVertex2d(0, Ortho2DSize_.height());
    glTexCoord2d(1.0f, 1.0f);
    glVertex2d(Ortho2DSize_.width(), Ortho2DSize_.height());
    glTexCoord2d(1.0f, 0.0f);
    glVertex2d(Ortho2DSize_.width(), 0);

    glEnd();
    glDisable(GL_TEXTURE_2D);

    

}