https://bugs.kde.org/show_bug.cgi?id=356992
--- Comment #19 from Thomas Lübking <thomas.luebk...@gmail.com> ---
No, we only want to skip that bit if we've buffer_age support anyway.
I've not looked into it, but guess the extension check requires a context, what
means we cannot depend this bit on the absence of buffer_age - or we cannot
avoid surface recreation - either because it failed due to that bit or because
we skipped the bit initially and afterwards figure we need it because we lack
buffer_age support. This sucks.
Can you debug the result of initEGL?
diff --git a/eglonxbackend.cpp b/eglonxbackend.cpp
index 480e533..abacdaa 100644
--- a/eglonxbackend.cpp
+++ b/eglonxbackend.cpp
@@ -89,6 +89,8 @@ EglOnXBackend::~EglOnXBackend()
void EglOnXBackend::init()
{
+ initEgl(); // required to toggle
+ initBufferAge(); // EGL_SWAP_BEHAVIOR_PRESERVED_BIT
if (!initRenderingContext()) {
setFailed(QStringLiteral("Could not initialize rendering context"));
return;
@@ -267,7 +269,7 @@ EGLSurface EglOnXBackend::createSurface(xcb_window_t
window)
bool EglOnXBackend::initBufferConfigs()
{
const EGLint config_attribs[] = {
- EGL_SURFACE_TYPE,
EGL_WINDOW_BIT|EGL_SWAP_BEHAVIOR_PRESERVED_BIT,
+ EGL_SURFACE_TYPE, EGL_WINDOW_BIT|(supportsBufferAge() ? 0 :
EGL_SWAP_BEHAVIOR_PRESERVED_BIT),
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
diff --git a/libkwineffects/kwinglutils.cpp b/libkwineffects/kwinglutils.cpp
index 438b785..b44b821 100644
--- a/libkwineffects/kwinglutils.cpp
+++ b/libkwineffects/kwinglutils.cpp
@@ -101,6 +101,7 @@ void initEGL()
eglVersion = MAKE_GL_VERSION(major, minor, 0);
const QByteArray string = eglQueryString(dpy, EGL_EXTENSIONS);
eglExtensions = string.split(' ');
+ qDebug() << eglExtensions;
eglResolveFunctions();
}
--
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