[solved] Select an OpenGL 4 context on Mac OSX Maverick

[Thoenu]

Hi all,

since some weeks I have troubles to select an OpenGL 4 context on Mac OSX 10.9 with QT when porting a cross plattform application. The format is set in the constructor of the main Window as shown in the following source:

@QGLFormat glFormat;
glFormat.setProfile( QGLFormat::CoreProfile );
glFormat.setVersion( 4, 1 );

QGLFormat::setDefaultFormat(glFormat);
glWidget = new GLWidget(_pathToEarthFile,glFormat);

QGLContext* glContext = (QGLContext *) glWidget->context();
glContext->makeCurrent();
this->setCentralWidget(glWidget);@

Later on, I do the version output the following:

@std::cout << "Widget OpenGl: " << glContext->format().majorVersion() << "." << glContext->format().minorVersion() << std::endl;
std::cout << "Context valid: " << glContext->isValid() << std::endl;
std::cout << "Really used OpenGl: " << glContext->format().majorVersion() << "." << glContext->format().minorVersion() << std::endl;
std::cout << "OpenGl information: " << std::endl;
std::cout << "VENDOR: " << (const char*)glGetString(GL_VENDOR) << std::endl;
std::cout << "RENDERDER: " << (const char*)glGetString(GL_RENDERER) << std::endl;
std::cout << "VERSION: " << (const char*)glGetString(GL_VERSION) << std::endl;
std::cout << "GLSL VERSION: " << (const char*)glGetString(GL_SHADING_LANGUAGE_VERSION) << std::endl;

qDebug() << "OpenGLVersionFlags(): " << QGLFormat::OpenGLVersionFlags();

if((QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_3_2) == 0)
{
std::cout << "GL 3.2 Not supported" << std::endl;
}@

and I get the following output:

@Widget OpenGl: 1.0
Context valid: 1
Really used OpenGl: 1.0
OpenGl information:
VENDOR: ATI Technologies Inc.
RENDERDER: ATI Radeon HD 5770 OpenGL Engine
VERSION: 2.1 ATI-1.14.21
GLSL VERSION: 1.20
OpenGLVersionFlags(): QFlags()
GL 3.2 Not supported @

What I know:

• My mac and the graphics card support 4.1, because the OpenGL Extension Viewer shows the 4.1. core profile.
• It does not depend what version I use in glFormat.setVersion, the output is always 1.0 for the qt context.
• sourcecode compiles with OpenGL 4.1 calls, which means, that the right OpenGL Framework is available while compilation (I included the OpenGL.framework in Xcode 5.01).
• shaders do not compile with version 410 or something else higher than 120.

Before christmas I tracked this down to the fact, that there was a wrong header included and that there is a fix in QT 5.2 beta. From then on I used the QT 5.2 build.

Has anyone experienced the same issues or did anyone got a similar example running without objective-c and without using another windowing system? I also thought, that it must be possible to reset the GL_VERSION in OpenGL anyhow, but this depends on the windowing system, doesn't it?

Cheers and thanks for the support!

[Thoenu]

Hi all,

this is solved. Did not find the valid QT 5.2. packages in cmake, but it is working now.

cheers