QOpenGLWindow 与 QPainter结合，怎么做？ - QTCN开发网

只看楼主倒序阅读楼主发表于: 2014-12-10

我看到一篇文章http://blog.qt.digia.com/blog/2014/11/20/qt-weekly-20-completing-the-offering-qopenglwindow-and-qrasterwindow/?utm_source=tuicool

里面有例子。我按照例子做了，但是得不到正确结果。代码贴出来。

复制代码

class Render : public QOpenGLWindow
{
public:
Render();
~Render();
protected:
void initializeGL();
void paintGL();
void resizeGL(int w ,int h);
QOpenGLFunctions * f;
QOpenGLBuffer * triangle;
QOpenGLVertexArrayObject * vao;
QOpenGLShaderProgram * program;
QMatrix4x4 mv,p;
QTimer * time;
float rota;
//QPainter * painter;
};

复制代码

GLfloat tri[] =
{
0.0f,1.0f,-1.0f,1.0f,
1.0f,1.0f,-1.0f,1.0f,
1.0f,0.0f,-1.0f,1.0f,
};
Render::Render()
{
QSurfaceFormat format;
format.setDepthBufferSize(24);
format.setStencilBufferSize(8);
format.setVersion(3,3);
format.setProfile(QSurfaceFormat::CoreProfile);
setFormat(format);
time = new QTimer;
connect(time,SIGNAL(timeout()),this,SLOT(update()));
time->start(50);
rota = 0;
}
Render::~Render()
{
}
void Render::initializeGL()
{
// f = QOpenGLContext::currentContext()->versionFunctions<QOpenGLFunctions_3_3_Core>();
// f->initializeOpenGLFunctions();
f = context()->functions();
program = new QOpenGLShaderProgram;
program->addShaderFromSourceCode(QOpenGLShader::Vertex,
"#version 330 core \n\
layout(location = 0) in vec4 vertex;\
uniform mat4 mvp;\
void main() \
{\
gl_Position = mvp * vertex;\
}");
program->addShaderFromSourceCode(QOpenGLShader::Fragment,
"#version 330 core \n\
out vec4 fragColor;\
void main() \
{ \
fragColor = vec4(0.0f,1.0f,0.0f,1.0f);\
}");
program->link();
vao = new QOpenGLVertexArrayObject;
vao->create();
vao->bind();
triangle = new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
triangle->create();
triangle->bind();
triangle->setUsagePattern(QOpenGLBuffer::StaticDraw);
triangle->allocate(tri,sizeof(tri));
program->enableAttributeArray(0);
program->setAttributeBuffer(0,GL_FLOAT,0,4,0);
f->glEnable(GL_DEPTH_TEST);
}
void Render::resizeGL(int w ,int h)
{
p.setToIdentity();
p.perspective(35.0f,float(w)/float(h),1.0f,30.0f);
}
void Render::paintGL()
{
program->bind();
f->glClearColor(0.5,0.5f,0.5f,1.0f);
f->glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
f->glViewport(0,0,width(),height());
mv.setToIdentity();
mv.lookAt(QVector3D(0.0f,0.0f,5.0f),QVector3D(0.0f,0.0f,0.0f),QVector3D(0.0f,1.0f,0.0f));
mv.rotate(0.5+rota,0,1,0);
program->setUniformValue("mvp",p*mv);
vao->bind();
f->glDrawArrays(GL_TRIANGLES,0,3);
rota=rota+1.5;
rota=rota>360.0?0:rota;
QPainter pp(this);
pp.drawText(10,20,"dsdsds");
update();
}