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Environment variable enabling the workaround FBO readback bug

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On some ARM devices the font glyph generation is broken
Add an environment variable to enable workaround_brokenFBOReadBack
in QOpenGLContext, to fix font rendering on such devices as
Mali and Adreno

Change-Id: I9cc99ecb8b71a35bc369ec9dd11b877016b1179e
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Marco Martin 2017-02-10 15:00:23 +01:00 committed by Laszlo Agocs
parent 6b52039866
commit 9ae028f507
3 changed files with 34 additions and 32 deletions
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34
src/gui/kernel/qopenglcontext.cpp
View File

@ -982,6 +982,40 @@ bool QOpenGLContext::makeCurrent(QSurface *surface)
QOpenGLContext *previous = QOpenGLContextPrivate::setCurrentContext(this);
if (d->platformGLContext->makeCurrent(surface->surfaceHandle())) {
static bool needsWorkaroundSet = false;
static bool needsWorkaround = false;
if (!needsWorkaroundSet) {
QByteArray env;
#ifdef Q_OS_ANDROID
env = qgetenv(QByteArrayLiteral("QT_ANDROID_DISABLE_GLYPH_CACHE_WORKAROUND"));
needsWorkaround = env.isEmpty() || env == QByteArrayLiteral("0") || env == QByteArrayLiteral("false");
#endif
env = qgetenv(QByteArrayLiteral("QT_ENABLE_GLYPH_CACHE_WORKAROUND"));
if (env == QByteArrayLiteral("1") || env == QByteArrayLiteral("true"))
needsWorkaround = true;
if (!needsWorkaround) {
const char *rendererString = reinterpret_cast<const char *>(functions()->glGetString(GL_RENDERER));
if (rendererString)
needsWorkaround =
qstrncmp(rendererString, "Mali-4xx", 6) == 0 // Mali-400, Mali-450
|| qstrncmp(rendererString, "Adreno (TM) 2xx", 13) == 0 // Adreno 200, 203, 205
|| qstrncmp(rendererString, "Adreno 2xx", 8) == 0 // Same as above but without the '(TM)'
|| qstrncmp(rendererString, "Adreno (TM) 30x", 14) == 0 // Adreno 302, 305
|| qstrncmp(rendererString, "Adreno 30x", 9) == 0 // Same as above but without the '(TM)'
|| qstrncmp(rendererString, "Adreno (TM) 4xx", 13) == 0 // Adreno 405, 418, 420, 430
|| qstrncmp(rendererString, "Adreno 4xx", 8) == 0 // Same as above but without the '(TM)'
|| qstrcmp(rendererString, "GC800 core") == 0
|| qstrcmp(rendererString, "GC1000 core") == 0
|| qstrcmp(rendererString, "Immersion.16") == 0;
}
needsWorkaroundSet = true;
}
if (needsWorkaround)
d->workaround_brokenFBOReadBack = true;
d->surface = surface;
d->shareGroup->d_func()->deletePendingResources(this);

31
src/plugins/platforms/android/qandroidplatformopenglcontext.cpp
View File

@ -65,42 +65,11 @@ void QAndroidPlatformOpenGLContext::swapBuffers(QPlatformSurface *surface)
QEGLPlatformContext::swapBuffers(surface);
}
bool QAndroidPlatformOpenGLContext::needsFBOReadBackWorkaround()
{
static bool set = false;
static bool needsWorkaround = false;
if (!set) {
QByteArray env = qgetenv("QT_ANDROID_DISABLE_GLYPH_CACHE_WORKAROUND");
needsWorkaround = env.isEmpty() || env == "0" || env == "false";
if (!needsWorkaround) {
const char *rendererString = reinterpret_cast<const char *>(glGetString(GL_RENDERER));
needsWorkaround =
qstrncmp(rendererString, "Mali-4xx", 6) == 0 // Mali-400, Mali-450
|| qstrncmp(rendererString, "Adreno (TM) 2xx", 13) == 0 // Adreno 200, 203, 205
|| qstrncmp(rendererString, "Adreno 2xx", 8) == 0 // Same as above but without the '(TM)'
|| qstrncmp(rendererString, "Adreno (TM) 30x", 14) == 0 // Adreno 302, 305
|| qstrncmp(rendererString, "Adreno 30x", 9) == 0 // Same as above but without the '(TM)'
|| qstrcmp(rendererString, "GC800 core") == 0
|| qstrcmp(rendererString, "GC1000 core") == 0
|| qstrcmp(rendererString, "Immersion.16") == 0;
}
set = true;
}
return needsWorkaround;
}
bool QAndroidPlatformOpenGLContext::makeCurrent(QPlatformSurface *surface)
{
bool ret = QEGLPlatformContext::makeCurrent(surface);
QOpenGLContextPrivate *ctx_d = QOpenGLContextPrivate::get(context());
if (!ctx_d->workaround_brokenFBOReadBack && needsFBOReadBackWorkaround())
ctx_d->workaround_brokenFBOReadBack = true;
return ret;
}

1
src/plugins/platforms/android/qandroidplatformopenglcontext.h
View File

@ -55,7 +55,6 @@ public:
private:
EGLSurface eglSurfaceForPlatformSurface(QPlatformSurface *surface) override;
static bool needsFBOReadBackWorkaround();
};
QT_END_NAMESPACE