winrt: Use ANGLE sub-buffer swap on Windows Phone

This allows the plugin to communicate the swap region to ANGLE and avoid glitches when the orientation changes. Task-number: QTBUG-44333 Change-Id: I40240cbcb3aaec92dbf4a82f4957965e92b9c3da Reviewed-by: Oliver Wolff <[email protected]>
RDevCore · May 8, 2015 · 00a341d · 00a341d
1 parent a34e9eb
commit 00a341d
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diff --git a/src/plugins/platforms/winrt/qwinrteglcontext.cpp b/src/plugins/platforms/winrt/qwinrteglcontext.cpp
@@ -33,13 +33,27 @@
 
 #include "qwinrteglcontext.h"
 
+#define EGL_EGLEXT_PROTOTYPES
+#include "EGL/eglext.h"
+
 QT_BEGIN_NAMESPACE
 
 QWinRTEGLContext::QWinRTEGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share, EGLDisplay display, EGLSurface surface, EGLConfig config)
     : QEGLPlatformContext(format, share, display, &config), m_eglSurface(surface)
 {
 }
 
+void QWinRTEGLContext::swapBuffers(QPlatformSurface *surface)
+{
+#ifdef Q_OS_WINPHONE
+    const QSize size = surface->surface()->size();
+    eglPostSubBufferNV(eglDisplay(), eglSurfaceForPlatformSurface(surface),
+                       0, 0, size.width(), size.height());
+#else
+    eglSwapBuffers(eglDisplay(), eglSurfaceForPlatformSurface(surface));
+#endif
+}
+
 EGLSurface QWinRTEGLContext::eglSurfaceForPlatformSurface(QPlatformSurface *surface)
 {
     if (surface->surface()->surfaceClass() == QSurface::Window) {

diff --git a/src/plugins/platforms/winrt/qwinrteglcontext.h b/src/plugins/platforms/winrt/qwinrteglcontext.h
@@ -43,6 +43,7 @@ class QWinRTEGLContext : public QEGLPlatformContext
 public:
     explicit QWinRTEGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share, EGLDisplay display, EGLSurface surface, EGLConfig config);
 
+    void swapBuffers(QPlatformSurface *surface) Q_DECL_OVERRIDE;
     QFunctionPointer getProcAddress(const QByteArray &procName) Q_DECL_OVERRIDE;
 
 protected: