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| |
| #include "qplatformopenglcontext.h" |
| |
| #include <QOpenGLFunctions> |
| |
| QT_BEGIN_NAMESPACE |
| |
| /*! |
| \class QPlatformOpenGLContext |
| \since 4.8 |
| \internal |
| \preliminary |
| \ingroup qpa |
| |
| \brief The QPlatformOpenGLContext class provides an abstraction for native GL contexts. |
| |
| In QPA the way to support OpenGL or OpenVG or other technologies that requires a native GL |
| context is through the QPlatformOpenGLContext wrapper. |
| |
| There is no factory function for QPlatformOpenGLContexts, but rather only one accessor function. |
| The only place to retrieve a QPlatformOpenGLContext from is through a QPlatformWindow. |
| |
| The context which is current for a specific thread can be collected by the currentContext() |
| function. This is how QPlatformOpenGLContext also makes it possible to use the Qt GUI module |
| withhout using QOpenGLWidget. When using QOpenGLContext::currentContext(), it will ask |
| QPlatformOpenGLContext for the currentContext. Then a corresponding QOpenGLContext will be returned, |
| which maps to the QPlatformOpenGLContext. |
| */ |
| |
| /*! \fn void QPlatformOpenGLContext::swapBuffers(QPlatformSurface *surface) |
| Reimplement in subclass to native swap buffers calls |
| |
| The implementation must support being called in a thread different than the gui-thread. |
| */ |
| |
| /*! \fn QFunctionPointer QPlatformOpenGLContext::getProcAddress(const char *procName) |
| |
| Reimplement in subclass to allow dynamic querying of OpenGL symbols. As opposed to e.g. the wglGetProcAddress |
| function on Windows, Qt expects this methods to be able to return valid function pointers even for standard |
| OpenGL symbols. |
| */ |
| |
| class QPlatformOpenGLContextPrivate |
| { |
| public: |
| QPlatformOpenGLContextPrivate() : context(nullptr) {} |
| |
| QOpenGLContext *context; |
| }; |
| |
| QPlatformOpenGLContext::QPlatformOpenGLContext() |
| : d_ptr(new QPlatformOpenGLContextPrivate) |
| { |
| } |
| |
| QPlatformOpenGLContext::~QPlatformOpenGLContext() |
| { |
| } |
| |
| /*! |
| Called after a new instance is constructed. The default implementation does nothing. |
| |
| Subclasses can use this function to perform additional initialization that relies on |
| virtual functions. |
| */ |
| void QPlatformOpenGLContext::initialize() |
| { |
| } |
| |
| /*! |
| Reimplement in subclass if your platform uses framebuffer objects for surfaces. |
| |
| The default implementation returns 0. |
| */ |
| GLuint QPlatformOpenGLContext::defaultFramebufferObject(QPlatformSurface *) const |
| { |
| return 0; |
| } |
| |
| QOpenGLContext *QPlatformOpenGLContext::context() const |
| { |
| Q_D(const QPlatformOpenGLContext); |
| return d->context; |
| } |
| |
| void QPlatformOpenGLContext::setContext(QOpenGLContext *context) |
| { |
| Q_D(QPlatformOpenGLContext); |
| d->context = context; |
| } |
| |
| bool QPlatformOpenGLContext::parseOpenGLVersion(const QByteArray &versionString, int &major, int &minor) |
| { |
| bool majorOk = false; |
| bool minorOk = false; |
| QList<QByteArray> parts = versionString.split(' '); |
| if (versionString.startsWith(QByteArrayLiteral("OpenGL ES"))) { |
| if (parts.size() >= 3) { |
| QList<QByteArray> versionParts = parts.at(2).split('.'); |
| if (versionParts.size() >= 2) { |
| major = versionParts.at(0).toInt(&majorOk); |
| minor = versionParts.at(1).toInt(&minorOk); |
| // Nexus 6 has "OpenGL ES 3.0V@95.0 (GIT@I86da836d38)" |
| if (!minorOk) |
| if (int idx = versionParts.at(1).indexOf('V')) |
| minor = versionParts.at(1).left(idx).toInt(&minorOk); |
| } else { |
| qWarning("Unrecognized OpenGL ES version"); |
| } |
| } else { |
| // If < 3 parts to the name, it is an unrecognised OpenGL ES |
| qWarning("Unrecognised OpenGL ES version"); |
| } |
| } else { |
| // Not OpenGL ES, but regular OpenGL, the version numbers are first in the string |
| QList<QByteArray> versionParts = parts.at(0).split('.'); |
| if (versionParts.size() >= 2) { |
| major = versionParts.at(0).toInt(&majorOk); |
| minor = versionParts.at(1).toInt(&minorOk); |
| } else { |
| qWarning("Unrecognized OpenGL version"); |
| } |
| } |
| |
| if (!majorOk || !minorOk) |
| qWarning("Unrecognized OpenGL version"); |
| return (majorOk && minorOk); |
| } |
| |
| QT_END_NAMESPACE |