Ensure we can query all GL functions in all platform plugins

This is required to simplify our code in the opengl classes
and makes it possible to remove OS dependent code paths in
Qt Gui.

Change-Id: Ice09440840c86b2d6ac8d3955d273846695338d4
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

3 files changed, 14 insertions, 5 deletions

diff --git a/src/plugins/platforms/directfb/qdirectfbglcontext.cpp b/src/plugins/platforms/directfb/qdirectfbglcontext.cpp
index e1607b131a..847435d96e 100644
--- a/src/plugins/platforms/directfb/qdirectfbglcontext.cpp
+++ b/src/plugins/platforms/directfb/qdirectfbglcontext.cpp
@@ -40,6 +40,7 @@
 #include "qdirectfbglcontext.h"
 
 #include <directfbgl.h>
+#include <dlfcn.h>
 
 #include <QDebug>
 
@@ -80,13 +81,13 @@ void QDirectFbGLContext::doneCurrent()
     m_dfbGlContext->Unlock(m_dfbGlContext);
 }
 
-void *QDirectFbGLContext::getProcAddress(const char *procName)
+QFunctionPointer QDirectFbGLContext::getProcAddress(const char *procName)
 {
     void *proc;
     DFBResult result = m_dfbGlContext->GetProcAddress(m_dfbGlContext, procName, &proc);
     if (result == DFB_OK)
-        return proc;
-    return 0;
+        return (QFunctionPointer) proc;
+    return dlsym(RTLD_DEFAULT, procName);
 }
 
 void QDirectFbGLContext::swapBuffers()
diff --git a/src/plugins/platforms/mirclient/qmirclientglcontext.cpp b/src/plugins/platforms/mirclient/qmirclientglcontext.cpp
index 7a288af6ff..b1ca0b1f7c 100644
--- a/src/plugins/platforms/mirclient/qmirclientglcontext.cpp
+++ b/src/plugins/platforms/mirclient/qmirclientglcontext.cpp
@@ -40,6 +40,7 @@
 #include "qmirclientlogging.h"
 #include <QtPlatformSupport/private/qeglconvenience_p.h>
 #include <QtGui/private/qopenglcontext_p.h>
+#include <dlfcn.h>
 
 #if !defined(QT_NO_DEBUG)
 static void printOpenGLESConfig() {
@@ -150,5 +151,8 @@ QFunctionPointer QMirClientOpenGLContext::getProcAddress(const char *procName)
 #else
     ASSERT(eglBindAPI(api_in_use()) == EGL_TRUE);
 #endif
-    return eglGetProcAddress(procName);
+    QFunctionPointer proc = (QFunctionPointer) eglGetProcAddress(procName);
+    if (!proc)
+        proc = (QFunctionPointer) dlsym(RTLD_DEFAULT, procName);
+    return proc;
 }
diff --git a/src/plugins/platforms/openwfd/qopenwfdglcontext.cpp b/src/plugins/platforms/openwfd/qopenwfdglcontext.cpp
index e57be90870..31d369ae00 100644
--- a/src/plugins/platforms/openwfd/qopenwfdglcontext.cpp
+++ b/src/plugins/platforms/openwfd/qopenwfdglcontext.cpp
@@ -41,6 +41,7 @@
 
 #include "qopenwfdwindow.h"
 #include "qopenwfdscreen.h"
+#include <dlfcn.h>
 
 QOpenWFDGLContext::QOpenWFDGLContext(QOpenWFDDevice *device)
     : QPlatformOpenGLContext()
@@ -86,7 +87,10 @@ void QOpenWFDGLContext::swapBuffers(QPlatformSurface *surface)
 
 QFunctionPointer QOpenWFDGLContext::getProcAddress(const char *procName)
 {
-    return eglGetProcAddress(procName);
+    QFunctionPointer proc = (QFunctionPointer) eglGetProcAddress(procName);
+    if (!proc)
+        proc = (QFunctionPointer) dlsym(RTLD_DEFAULT, procName);
+    return proc;
 }
 
 EGLContext QOpenWFDGLContext::eglContext() const