QGLEngineSelector Class Reference

Public Functions
QPaintEngine::Type	preferredPaintEngine ()
	QGLEngineSelector ()
void	setPreferredPaintEngine (QPaintEngine::Type type)

Properties
QPaintEngine::Type	engineType

Detailed Description

Definition at line 159 of file qgl.cpp.

Constructors and Destructors

QGLEngineSelector()

QGLEngineSelector::QGLEngineSelector ( )

inline

Definition at line 162 of file qgl.cpp.

                        : engineType(QPaintEngine::MaxUser)
    {
    }

Functions

preferredPaintEngine()

QPaintEngine::Type QGLEngineSelector::preferredPaintEngine ( )

inline

Definition at line 171 of file qgl.cpp.

                                            {
#ifdef Q_WS_MAC
        // The ATI X1600 driver for Mac OS X does not support return
        // values from functions in GLSL. Since working around this in
        // the GL2 engine would require a big, ugly rewrite, we're
        // falling back to the GL 1 engine..
        static bool mac_x1600_check_done = false;
        if (!mac_x1600_check_done) {
            QGLTemporaryContext *tmp = 0;
            if (!QGLContext::currentContext())
                tmp = new QGLTemporaryContext();
            if (strstr((char *) glGetString(GL_RENDERER), "X1600"))
                engineType = QPaintEngine::OpenGL;
            if (tmp)
                delete tmp;
            mac_x1600_check_done = true;
        }
#endif
        if (engineType == QPaintEngine::MaxUser) {
            // No user-set engine - use the defaults
#if defined(QT_OPENGL_ES_2)
            engineType = QPaintEngine::OpenGL2;
#else
            // We can't do this in the constructor for this object because it
            // needs to be called *before* the QApplication constructor.
            // Also check for the FragmentShader extension in conjunction with
            // the 2.0 version flag, to cover the case where we export the display
            // from an old GL 1.1 server to a GL 2.x client. In that case we can't
            // use GL 2.0.
            if ((QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_2_0)
                && (QGLExtensions::glExtensions() & QGLExtensions::FragmentShader)
                && qgetenv("QT_GL_USE_OPENGL1ENGINE").isEmpty())
                engineType = QPaintEngine::OpenGL2;
            else
                engineType = QPaintEngine::OpenGL;
#endif
        }
        return engineType;
    }

setPreferredPaintEngine()

void QGLEngineSelector::setPreferredPaintEngine ( QPaintEngine::Type  type )

inline

Definition at line 166 of file qgl.cpp.

                                                        {
        if (type == QPaintEngine::OpenGL || type == QPaintEngine::OpenGL2)
            engineType = type;
    }

Properties

engineType

QPaintEngine::Type QGLEngineSelector::engineType

private

Definition at line 212 of file qgl.cpp.

---

The documentation for this class was generated from the following file:

• /src/opengl/qgl.cpp