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Qt: Fall back to 1.4 if 2.x context is bad

This commit is contained in:
Vicki Pfau 2019-05-17 19:53:46 -07:00
parent 320971af93
commit 921f3f864d
1 changed files with 18 additions and 1 deletions
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19
src/platform/qt/DisplayGL.cpp
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@ -34,12 +34,29 @@ DisplayGL::DisplayGL(const QSurfaceFormat& format, QWidget* parent)
: Display(parent)
, m_gl(nullptr)
{
setAttribute(Qt::WA_NativeWindow);
// This can spontaneously re-enter into this->resizeEvent before creation is done, so we
// need to make sure it's initialized to nullptr before we assign the new object to it
m_gl = new QOpenGLContext;
m_gl->setFormat(format);
m_gl->create();
setAttribute(Qt::WA_NativeWindow);
m_gl->makeCurrent(windowHandle());
#if defined(_WIN32) && defined(USE_EPOXY)
epoxy_handle_external_wglMakeCurrent();
#endif
int majorVersion = m_gl->format().majorVersion();
QStringList extensions = QString(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))).split(' ');
m_gl->doneCurrent();
if (majorVersion == 2 && !extensions.contains("GL_ARB_framebuffer_object")) {
QSurfaceFormat newFormat(format);
newFormat.setVersion(1, 4);
m_gl->setFormat(newFormat);
m_gl->create();
}
m_painter = new PainterGL(&m_videoProxy, windowHandle(), m_gl);
setUpdatesEnabled(false); // Prevent paint events, which can cause race conditions