Qt5 OpenGL GLSL version error

Question

I'm starting out on using OpenGL with Qt, and with Shaders (I have OpenGL experience, but not with shaders yet)

I'm following this tutorial: http://releases.qt-project.org/learning/developerguides/qtopengltutorial/OpenGLTutorial.pdf (the official Qt5 OpenGL tutorial).

The problem is, that when I try to run my program, I get a black screen and the following error messages:

QGLShader::compile(Vertex): ERROR: 0:1: '' :  version '130' is not supported

QGLShader::compile(Fragment): ERROR: 0:1: '' :  version '130' is not supported

My program is based on a QGLWidget

With some browsing on the interwebs I found out that I need to use an OpenGL 3.2 context, but that Qt likes to use OpenGL 2.x

My computer:

• MacBook pro retina '15, late 2012
• Intel HD 4000
• NVidia GeForce 650M

So, how can I make this work?

EDIT:

My version is 3.2 (set through QGLFormat), without a specified format it uses 2.0

fragmentShader.frag:

#version 130

uniform vec4 color;

out vec4 fragColor;

void main(void)
{
    fragColor = color;
}

vertexShader.vert:

#version 130

uniform mat4 mvpMatrix;

in vec4 vertex;

void main(void)
{
    gl_Position = mvpMatrix * vertex;
}

Errors (with format, OpenGL 3.2):

QGLShaderProgram: shader programs are not supported 
QGLShaderProgram::uniformLocation( mvpMatrix ): shader program is not linked 
The program has unexpectedly finished.

Errors (without format, OpenGL 2.0):

QGLShader::compile(Vertex): ERROR: 0:1: '' :  version '130' is not supported

QGLShader::compile(Fragment): ERROR: 0:1: '' :  version '130' is not supported

Answer 1

Newer QOpenGLWidget doesn't support any constructor with QGLFormat. Instead, in your main.cpp, specify the default QSurfaceFormat for all QOpenGLWidget and QOpenGLContext as following:

// main.cpp
QSurfaceFormat glFormat;
glFormat.setVersion(3, 3);
glFormat.setProfile(QSurfaceFormat::CoreProfile);
QSurfaceFormat::setDefaultFormat(glFormat);

Now you should be able to use something like #version 330 core in your shader.

Answer 2

You should create an QGLFormat object and pass it to the QGLWidget as a constructor parameter. The QGLFormat object should be created as showed in the code below.

QGLFormat glFormat;
glFormat.setVersion( 3, 2 );
glFormat.setProfile( QGLFormat::CoreProfile );