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Merge pull request #9163 from jherico/gl_context_preservation

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Preserve and restore the GL context when resizing QML surfaces
This commit is contained in:
Chris Collins 2016-12-07 09:08:36 -08:00 committed by GitHub
commit bc9f2b4007
3 changed files with 46 additions and 28 deletions
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12
libraries/gl/src/gl/GLHelpers.cpp
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@ -69,3 +69,15 @@ QThread* RENDER_THREAD = nullptr;
bool isRenderThread() { bool isRenderThread() {
return QThread::currentThread() == RENDER_THREAD; return QThread::currentThread() == RENDER_THREAD;
} }
namespace gl {
void withSavedContext(const std::function<void()>& f) {
// Save the original GL context, because creating a QML surface will create a new context
QOpenGLContext * savedContext = QOpenGLContext::currentContext();
QSurface * savedSurface = savedContext ? savedContext->surface() : nullptr;
f();
if (savedContext) {
savedContext->makeCurrent(savedSurface);
}
}
}

5
libraries/gl/src/gl/GLHelpers.h
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@ -10,6 +10,7 @@
#ifndef hifi_GLHelpers_h #ifndef hifi_GLHelpers_h
#define hifi_GLHelpers_h #define hifi_GLHelpers_h
#include <functional>
#include <QJsonObject> #include <QJsonObject>
// 16 bits of depth precision // 16 bits of depth precision
@ -34,4 +35,8 @@ int glVersionToInteger(QString glVersion);
bool isRenderThread(); bool isRenderThread();
namespace gl {
void withSavedContext(const std::function<void()>& f);
}
#endif #endif

3
libraries/gl/src/gl/OffscreenQmlSurface.cpp
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@ -467,7 +467,7 @@ void OffscreenQmlSurface::resize(const QSize& newSize_, bool forceResize) {
} }
qCDebug(glLogging) << "Offscreen UI resizing to " << newSize.width() << "x" << newSize.height(); qCDebug(glLogging) << "Offscreen UI resizing to " << newSize.width() << "x" << newSize.height();
gl::withSavedContext([&] {
_canvas->makeCurrent(); _canvas->makeCurrent();
// Release hold on the textures of the old size // Release hold on the textures of the old size
@ -501,6 +501,7 @@ void OffscreenQmlSurface::resize(const QSize& newSize_, bool forceResize) {
} }
_canvas->doneCurrent(); _canvas->doneCurrent();
});
} }
QQuickItem* OffscreenQmlSurface::getRootItem() { QQuickItem* OffscreenQmlSurface::getRootItem() {