@@ -146,7 +146,7 @@ CaptureWinGLEngine::CaptureWinGLEngine() :
m_mag_filter(GL_NEAREST),
m_min_filter(GL_NEAREST)
{
- m_glfunction.initializeGLFunctions(context());
+
}
CaptureWinGLEngine::~CaptureWinGLEngine()
@@ -238,8 +238,10 @@ void CaptureWinGLEngine::setLinearFilter(bool enable)
void CaptureWinGLEngine::clearShader()
{
glDeleteTextures(m_screenTextureCount, m_screenTexture);
- m_shaderProgram.release();
- m_shaderProgram.removeAllShaders();
+ if (m_shaderProgram.isLinked()) {
+ m_shaderProgram.release();
+ m_shaderProgram.removeAllShaders();
+ }
}
void CaptureWinGLEngine::stop()
@@ -252,6 +254,8 @@ void CaptureWinGLEngine::stop()
void CaptureWinGLEngine::initializeGL()
{
+ m_glfunction.initializeGLFunctions(context());
+
glShadeModel(GL_FLAT);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
Fix the following two runtime errors with qt-5.3.2: - QOpenGLFunctions created with non-current context Program received signal SIGSEGV, Segmentation fault. #0 0x00007ffff62819f0 in QOpenGLContext::shareGroup() const () at /usr/lib64/libQt5Gui.so.5 #1 0x00007ffff64ff470 in () at /usr/lib64/libQt5Gui.so.5 #2 0x00007ffff64ff64b in QOpenGLFunctions::initializeOpenGLFunctions() () at /usr/lib64/libQt5Gui.so.5 #3 0x00007ffff70c2e29 in () at /usr/lib64/libQt5OpenGL.so.5 #4 0x00007ffff70c2f7c in QGLFunctions::initializeGLFunctions(QGLContext const*) () at /usr/lib64/libQt5OpenGL.so.5 #5 0x000000000040fab7 in CaptureWinGLEngine::CaptureWinGLEngine() (this=0x7494f0) at ../qv4l2/capture-win-gl.cpp:149 #6 0x000000000040f562 in CaptureWinGL::CaptureWinGL(ApplicationWindow*) (this=0x749420, aw= 0x8bbda0) at ../qv4l2/capture-win-gl.cpp:28 #7 0x000000000043c005 in ApplicationWindow::newCaptureWin() (this=0x8bbda0) at ../qv4l2/qv4l2.cpp:443 #8 0x000000000043ab8e in ApplicationWindow::setDevice(QString const&, bool) (this=0x8bbda0, device=..., rawOpen=false) at ../qv4l2/qv4l2.cpp:257 #9 0x0000000000444724 in main(int, char**) (argc=1, argv=0x7fffffffdcd8) at ../qv4l2/qv4l2.cpp:1774 Solution: call QGLFunctions::initializeGLFunctions() later (in CaptureWinGLEngine::initializeGL()). - Program received signal SIGSEGV, Segmentation fault. #0 0x00007ffff70c8cc0 in QGLShaderProgram::release() () at /usr/lib64/libQt5OpenGL.so.5 #1 0x000000000040fe0f in CaptureWinGLEngine::clearShader() (this=0x6f0ae0) at ../qv4l2/capture-win-gl.cpp:241 #2 0x000000000041016b in CaptureWinGLEngine::changeShader() (this=0x6f0ae0) at ../qv4l2/capture-win-gl.cpp:353 #3 0x00000000004105db in CaptureWinGLEngine::paintGL() (this=0x6f0ae0) at ../qv4l2/capture-win-gl.cpp:438 #4 0x00007ffff70bc2f4 in QGLWidget::glDraw() () at /usr/lib64/libQt5OpenGL.so.5 #5 0x00007ffff70b9229 in QGLWidget::paintEvent(QPaintEvent*) () at /usr/lib64/libQt5OpenGL.so.5 #6 0x00007ffff69ec112 in QWidget::event(QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #7 0x00007ffff69b0cfc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #8 0x00007ffff69b5c36 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #9 0x00007ffff5d0fb35 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5 #10 0x00007ffff69e6b25 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib64/libQt5Widgets.so.5 #11 0x00007ffff69bd3a1 in QWidgetPrivate::repaint_sys(QRegion const&) () at /usr/lib64/libQt5Widgets.so.5 #12 0x00007ffff6a0b873 in () at /usr/lib64/libQt5Widgets.so.5 #13 0x00007ffff69b0cfc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #14 0x00007ffff69b5c36 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #15 0x00007ffff5d0fb35 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5 #16 0x00007ffff6244fe6 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /usr/lib64/libQt5Gui.so.5 #17 0x00007ffff6245b45 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib64/libQt5Gui.so.5 #18 0x00007ffff622c5a8 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Gui.so.5 #19 0x00007fffeeb75f30 in () at /usr/lib64/qt5/plugins/platforms/libqxcb.so #20 0x00007ffff42b1a04 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0 #21 0x00007ffff42b1c48 in () at /usr/lib64/libglib-2.0.so.0 #22 0x00007ffff42b1cec in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #23 0x00007ffff5d6689c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #24 0x00007ffff5d0da4b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #25 0x00007ffff5d150a6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5 #26 0x000000000044476d in main(int, char**) (argc=1, argv=0x7fffffffdcd8) at ../qv4l2/qv4l2.cpp:1777 Solution: call QGLShaderProgram::release() only in case shader program is previously linked. Signed-off-by: Peter Seiderer <ps.report@gmx.net> --- utils/qv4l2/capture-win-gl.cpp | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)