Back-port several OpenGL/ES fixes from 4.6 to 4.5

8ee6d090d45198fb2530849236c97f014666b7e4: fix EGL_SAMPLES
b125af1b298d694c332f56deebe4755d0c985d5d: memory leak of EGLSurface's
ef8d9fa7091b0d45fe15aae43b8f1c47547cb16d: double-destroy of pbuffer
73d9dced8298dfad7bc72607146e81e96fffb6d4: suppress pbuffer warnings

Reviewed-by: Donald Carr

3 files changed, 14 insertions, 5 deletions

diff --git a/src/opengl/qgl_egl.cpp b/src/opengl/qgl_egl.cpp
index 7e91c353b8..348a67736c 100644
--- a/src/opengl/qgl_egl.cpp
+++ b/src/opengl/qgl_egl.cpp
@@ -74,7 +74,7 @@ void qt_egl_set_format(QEglProperties& props, int deviceType, const QGLFormat& f
         props.setValue(EGL_STENCIL_SIZE, f.stencilBufferSize() == -1 ? 1 : f.stencilBufferSize());
     if (f.sampleBuffers()) {
         props.setValue(EGL_SAMPLE_BUFFERS, 1);
-        props.setValue(EGL_SAMPLES, f.samples());
+        props.setValue(EGL_SAMPLES, f.samples() == -1 ? 1 : f.samples());
     } else {
         props.setValue(EGL_SAMPLE_BUFFERS, 0);
     }
diff --git a/src/opengl/qgl_qws.cpp b/src/opengl/qgl_qws.cpp
index b842426f43..4058b66bff 100644
--- a/src/opengl/qgl_qws.cpp
+++ b/src/opengl/qgl_qws.cpp
@@ -187,6 +187,8 @@ void QGLContext::reset()
     d->cleanup();
     doneCurrent();
     if (d->eglContext) {
+        if (d->eglContext->surface() != EGL_NO_SURFACE)
+            eglDestroySurface(d->eglContext->display(), d->eglContext->surface());
         delete d->eglContext;
         d->eglContext = 0;
     }
diff --git a/src/opengl/qglpixelbuffer_egl.cpp b/src/opengl/qglpixelbuffer_egl.cpp
index b2f16c1390..fbe6c3601a 100644
--- a/src/opengl/qglpixelbuffer_egl.cpp
+++ b/src/opengl/qglpixelbuffer_egl.cpp
@@ -152,7 +152,7 @@ bool QGLPixelBufferPrivate::init(const QSize &size, const QGLFormat &f, QGLWidge
 
 bool QGLPixelBufferPrivate::cleanup()
 {
-    eglDestroySurface(QEglContext::defaultDisplay(0), pbuf);
+    // No need to destroy "pbuf" here - it is done in QGLContext::reset().
     return true;
 }
 
@@ -203,13 +203,20 @@ GLuint QGLPixelBuffer::generateDynamicTexture() const
 bool QGLPixelBuffer::hasOpenGLPbuffers()
 {
     // See if we have at least 1 configuration that matches the default format.
-    QEglContext ctx;
-    if (!ctx.openDisplay(0))
+    EGLDisplay dpy = QEglContext::defaultDisplay(0);
+    if (dpy == EGL_NO_DISPLAY)
         return false;
     QEglProperties configProps;
     qt_egl_set_format(configProps, QInternal::Pbuffer, QGLFormat::defaultFormat());
     configProps.setRenderableType(QEglContext::OpenGL);
-    return ctx.chooseConfig(configProps, QEglContext::BestPixelFormat);
+    do {
+        EGLConfig cfg = 0;
+        EGLint matching = 0;
+        if (eglChooseConfig(dpy, configProps.properties(),
+                            &cfg, 1, &matching) && matching > 0)
+            return true;
+    } while (configProps.reduceConfiguration());
+    return false;
 }
 
 QT_END_NAMESPACE