diff options
| author | Fabian Bumberger <fbumberger@rim.com> | 2014-03-17 17:45:08 +0100 |
|---|---|---|
| committer | The Qt Project <gerrit-noreply@qt-project.org> | 2014-04-01 23:35:21 +0200 |
| commit | 2c36469a16f166a3b4e513cccf8186157952bba0 (patch) | |
| tree | 250c3eeaefbc2034583ee64975592c3254bf0f16 /src | |
| parent | 30b334ffebb13876d89395f6ac253b7741920efe (diff) | |
QNX: Fix OpenGL autotest
On QNX grabbing the frame buffer returns the content of the back buffer.
In order to execute the OpenGL tests properly a swapBuffers is executed before
in order to be able to retrieve the content of the front buffer.
The patch also documents this platform behavior.
Change-Id: I7a501818ec6eea061f2f54f95854f68cb72e0534
Reviewed-by: James McDonnell <jmcdonnell@qnx.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/opengl/qgl.cpp | 5 | ||||
| -rw-r--r-- | src/opengl/qglframebufferobject.cpp | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp index e602a05af9..637cfc55a8 100644 --- a/src/opengl/qgl.cpp +++ b/src/opengl/qgl.cpp @@ -4083,6 +4083,11 @@ QPixmap QGLWidget::renderPixmap(int w, int h, bool useContext) Depending on your hardware, you can explicitly select which color buffer to grab with a glReadBuffer() call before calling this function. + + On QNX the back buffer is not preserved when swapBuffers() is called. The back buffer + where this function reads from, might thus not contain the same content as the front buffer. + In order to retrieve what is currently visible on the screen, swapBuffers() + has to be executed prior to this function call. */ QImage QGLWidget::grabFrameBuffer(bool withAlpha) { diff --git a/src/opengl/qglframebufferobject.cpp b/src/opengl/qglframebufferobject.cpp index d636da91b5..bd8bc2f64a 100644 --- a/src/opengl/qglframebufferobject.cpp +++ b/src/opengl/qglframebufferobject.cpp @@ -1114,6 +1114,9 @@ QGLFramebufferObjectFormat QGLFramebufferObject::format() const \fn QImage QGLFramebufferObject::toImage() const Returns the contents of this framebuffer object as a QImage. + + On QNX the back buffer is not preserved when a buffer swap occures. So this function + might return old content. */ QImage QGLFramebufferObject::toImage() const { |