Detect context sharing on EGL systems

Context sharing was enabled on EGL systems, but QGLContext::isSharing()
was still returning false because the flag in QGLContextPrivate
was not updated.

Reviewed-by: Sarah Smith
(cherry picked from commit f89fc92d1da06964a890e7800caeab62579a0fb4)

5 files changed, 9 insertions, 0 deletions

diff --git a/src/gui/egl/qegl.cpp b/src/gui/egl/qegl.cpp
index 39291d3..c0e4890 100644
--- a/src/gui/egl/qegl.cpp
+++ b/src/gui/egl/qegl.cpp
@@ -62,6 +62,7 @@ QEglContext::QEglContext()
     , currentSurface(EGL_NO_SURFACE)
     , current(false)
     , ownsContext(true)
+    , sharing(false)
 {
 }
 
@@ -174,6 +175,7 @@ bool QEglContext::createContext(QEglContext *shareContext, const QEglProperties
     if (apiType == QEgl::OpenGL)
         contextProps.setValue(EGL_CONTEXT_CLIENT_VERSION, 2);
 #endif
+    sharing = false;
     if (shareContext && shareContext->ctx == EGL_NO_CONTEXT)
         shareContext = 0;
     if (shareContext) {
@@ -181,6 +183,8 @@ bool QEglContext::createContext(QEglContext *shareContext, const QEglProperties
         if (ctx == EGL_NO_CONTEXT) {
             qWarning() << "QEglContext::createContext(): Could not share context:" << errorString(eglGetError());
             shareContext = 0;
+        } else {
+            sharing = true;
         }
     }
     if (ctx == EGL_NO_CONTEXT) {
diff --git a/src/gui/egl/qegl_p.h b/src/gui/egl/qegl_p.h
index 16b5b16..51bdbbe 100644
--- a/src/gui/egl/qegl_p.h
+++ b/src/gui/egl/qegl_p.h
@@ -81,6 +81,7 @@ public:
 
     bool isValid() const;
     bool isCurrent() const;
+    bool isSharing() const { return sharing; }
 
     QEgl::API api() const { return apiType; }
     void setApi(QEgl::API api) { apiType = api; }
@@ -132,6 +133,7 @@ private:
     EGLSurface currentSurface;
     bool current;
     bool ownsContext;
+    bool sharing;
 
     static EGLDisplay getDisplay(QPaintDevice *device);
 
diff --git a/src/opengl/qgl_qws.cpp b/src/opengl/qgl_qws.cpp
index 5e59975..de9c6ae 100644
--- a/src/opengl/qgl_qws.cpp
+++ b/src/opengl/qgl_qws.cpp
@@ -206,6 +206,7 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
         d->eglContext = 0;
         return false;
     }
+    d->sharing = d->eglContext->isSharing();
 
 #if defined(EGL_VERSION_1_1)
     if (d->glFormat.swapInterval() != -1 && devType == QInternal::Widget)
diff --git a/src/opengl/qgl_wince.cpp b/src/opengl/qgl_wince.cpp
index fea2d3a..86fe3ba 100644
--- a/src/opengl/qgl_wince.cpp
+++ b/src/opengl/qgl_wince.cpp
@@ -166,6 +166,7 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
         d->eglContext = 0;
         return false;
     }
+    d->sharing = d->eglContext->isSharing();
 
 #if defined(EGL_VERSION_1_1)
     if (d->glFormat.swapInterval() != -1 && devType == QInternal::Widget)
diff --git a/src/opengl/qgl_x11egl.cpp b/src/opengl/qgl_x11egl.cpp
index 9b20297..5325451 100644
--- a/src/opengl/qgl_x11egl.cpp
+++ b/src/opengl/qgl_x11egl.cpp
@@ -115,6 +115,7 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
         d->eglContext = 0;
         return false;
     }
+    d->sharing = d->eglContext->isSharing();
 
 #if defined(EGL_VERSION_1_1)
     if (d->glFormat.swapInterval() != -1 && devType == QInternal::Widget)