Fixes purify warning:
[W] UMR: Uninitialized memory read in QSGAnimationDriver::advance(void) {1 occurrence}
QSGAnimationDriver::advance(void) [qtdeclarative\src\quick\scenegraph\qsgcontext.cpp:221]

Task-number: QTBUG-42213
Change-Id: Ide35830c60c5935644747da5cfbad1cdbd357232
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

We're removing the bad/reallyBad concept for the benefit of an
accumulated lag. When the lag passes over a certain threshold, we
switch to time based. The logic for switching back remains unchanged.

We also fixed the switching so that elapsed() does not jump from the
predicted time to the animation system's wall time, but rather
continues from the predicted time with a walltime offset (this is how
it was always intended to be).

Task-number: QTBUG-42020
Change-Id: I7ee9181aca46cbc18a74fae5e8d513365906c017
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>

I've wanted this for a long time, but the animation system didn't
support it when mixed with timers/pauses. However, because of
dfc8f8b5d4a02f33c7f9063c2a28450902a9d863 and
0db3ea4048fe572a256deb343ea5e64a55d98de9 to qtbase, it is now
possible.

Change-Id: Ic70c181ce49eae90276bd4f22a2d299061f96087
Reviewed-by: Michael Brasser <michael.brasser@live.com>

This problem existed on 10.6, but is not reproducible on newer
MacBookPros, so disable it for 10.8 and up.

Change-Id: I0ae216c8e2307df5f77a783ec2d2031bf12ccbf2
Task-number: QTBUG-20193
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

This allows the scenegraph backend to customize how QSGPainterNodes are
rendered.

Change-Id: I640dcf121d0be6bda615cf30591d502329fc89d0
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

- Renamed LICENSE.LGPL to LICENSE.LGPLv21
- Added LICENSE.LGPLv3 & LICENSE.GPLv2
- Removed LICENSE.GPL

Change-Id: I84a565e2e0caa3b76bf291a7d188a57a4b00e1b0
Reviewed-by: Jani Heikkinen <jani.heikkinen@digia.com>

This way they will at least render.

[ChangeLog][QtQuick] Images exceeding GL_MAX_TEXTURE_SIZE will be
downscaled to fit so they will still show.

Change-Id: I169ecac768036812b8e14265ec1a0a8902655666
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

This basically renames QQuickShaderEffectTexture to QSGDefaultLayer and
introduces QSGLayer as interface to be used. QQuickShaderEffectTexture is
generic for the scene graph and has no QtQuick dependencies. The interface
separation allows scene graph backends to customize layers.

Change-Id: I9a7f37addaa4b80a34ff9a1456b0cb9b16d4e9f3
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Unfortunately we can't re-use the QSGSimpleRectNode, as it doesn't provide us
with virtual methods to move it's creation into the context. But's since it's
only 20 lines of code anyway, this is still a nice cleanup. And it also allows
the re-use of any optimizations in the renderer for QSGRectangleNode.

Change-Id: I957777fbbeb0a994a9c257baf3bfe87fce8cc9e8
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

Change-Id: I5981190dd43082715a7159efd478469365caf3a6
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Replaced by QSurfaceFormat::setDefaultFormat().

Change-Id: If4e37b75ccb55d556d80b0079be89e5a521f6dbb
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

This allows a scene graph backend to customize the style rendering

Change-Id: I6048df47ed3705d81140d63a21257f704a0e0a82
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1) Don't fail the assertion in the animator jobs if we don't have a context
2) Delegate the opengl context check in QQuickWindow::createTextureFromImage
   to the QSGContext

Change-Id: I1b248895dcd6db406f1af8866fd0052dd7564899
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

This change wraps QSGRenderContext and QSGContext in a new QSGEngine
class, and expose a public interface of QSGRenderer through a
QSGAbstractRenderer to make it usable on a standalone window or FBO.

Change-Id: I2d41187472424f5ea64650a006bcd61f2711f6b9
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Change-Id: I865ee838b0fd6c257b7189f24130012b98206fd1
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

Some implementations will use the initialization to set
constant uniforms like texture locations, so bind the
program before so this will work.

Task-number: QTBUG-39472
Change-Id: I677c5aeefe68535bd4805e83b93308d0bd090030
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

QSGRenderContext was holding pointers to QFontEngines without
increasing the font engine's ref count, allowing them to be deleted
before QSGRenderContext could make use of them.

Task-number: QTBUG-36573
Task-number: QTBUG-38313
Change-Id: I0ed28bb44882c55f330c27c23b533b7999d7e04b
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Change-Id: I9b8673fb3292c9d5ad2f9e8e63f56dc661699be6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

Task-number: QTBUG-38564
Change-Id: Ice1170339f7d650fcb6accfccf325471629343d6
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

This removes QSGContext::sharedOpenGLContext and replace its uses
with QOpenGLContextPrivate::globalShareContext, which is also going
to be used by QOpenGLWidget and QQuickWidget.

Change-Id: I1e296c3e6832f717caaf31ba7d7b27c06249219b
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

The counterpart to I716fdebb. Implements the dynamic path
in scenegraph.

Task-number: QTBUG-36483
Change-Id: I2dc613ba84560b7b8e36d3cd1da61c050ab08db0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

Change-Id: I9856c110399c4b6b1ea6aba2d92392cecff04656
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

This reverts commit a8a90519

. The
same functionality is now available in a more extensible way via
the program binary support recently added.

Change-Id: I07b1939611a76858e65605ce625da6c4cbca2114
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Change-Id: I4eecff3c8a2c727d38d394305d248eddeef87e8e
Reviewed-by: Michael Brasser <michael.brasser@live.com>

Without this change, it is not possible to implement a custom renderer
(it has no way to compile or initialize material shaders).

Change-Id: Ie8778f739f3551f88f0d44ccb9769063a87ff276
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Without this change, it is not possible to implement a custom context
without also implementing a renderloop.

Change-Id: Iac2aa732251cdf7221b28f665394cdd336a3d846
Reviewed-by: Michael Brasser <michael.brasser@live.com>

Makes QSGContext::createGlyphNode() the central point of determining which
glyph node to produce, instead of letting the caller call two different
versions of the factory, each one calling the other in various cases and
behind various ifdefs.

Change-Id: I30fb17cceab45d9e13ddf3ece7a65f220c5e5acd
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

This was ok for the threaded renderer, but for the single-threaded
renderers where the event loop was spinning we could run the risk
of scheduling a texture for deleteLater() and then cleaning it
up before we got around to the sync phase.

Task-number: QTBUG-35670
Change-Id: I92074294b427fd8ab2a1823ba79c7ac3b59094ec
Reviewed-by: Michael Brasser <michael.brasser@live.com>

Some GL implementations (especially on embedded) will give us an
OpenGL context without a depth buffer. In low memory scenarios, it
might also be feasible to request a non-depth buffer context to save
the depth buffer memory. The renderer deals with this by treating all
nodes as translucent, by not adjusting the shaders and by not creating
the extra z-order vertex attribute for merged nodes.

Change-Id: I8edc92d530daa3e2628df2ba52901b47d87eaf26
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

This GPU is on the Huawei Ascend D1 and exhibits crashes
in glDrawElements() when rendering scenegraph when the workaround
is not turned on.

Change-Id: Ic601d34c01e34faaa091a631cfed74c3601c9c43
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

When rendering multiple windows in parallel on llvmpipe we end up with
crashes deep inside llvmpipe as multiple threads seem to access
unprotected resources. Work around this bug by enforcing that scene
graph rendering happens on one window at a time.

Task-number: QTCREATORBUG-10666
Change-Id: I2f734e8f653b2a9b4108eb189280ab922581e2c0
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

The basic approach is to have the batched renderer create and bind a
vertex array object if it detects we are using an OpenGL Core profile
context. The VAO is bound for the duration of the QQ2 renderer's
work cycle and unbound at the end so as to not interfere with any
other VAO's a user may wish to use.

All shaders have been copied and ported to be compliant with the
GLSL 150 core specification which is the minimum for a Core profile
context (OpenGL 3.2 Core). We are not using any newer features as
yet so this will work anywhere we can get a Core profile context.

The QSGShaderSourceBuilder class has been extended to resolve any
requests for shaders to the same basefilename with "_core"
appended prior to any file extension. This could be extended in
the future to allow version, or GPU or platform specific shaders.

The QSGShaderSourceBuilder has also been extended to allow it to
insert #define definitions in the prologue of a shader. Any such
definition is inserted:

* After the last #extension directive (if any are found)
* Otherwise after the #version directive (if found)
* Otherwise at the start of the shader source

This is required by the custom particle shaders which make
extensive use of such #defines.

In addition the mechanism used by the distance field glyph cache to
extend the cache with new glyphs has been modified to work (and
work more efficiently) when using a Core profile context.

Rather than using a shader program and a buffer filling quad to
blit the old texture into the new cache texture, we instead use
the technique of framebuffer blitting. The existing fallback
implementation using glTexSubImage2D() is still available if
needed.

The DECLARATIVE_EXAMPLE_MAIN macro has been extended to allow easy
testing of any of the QtDeclarative examples with a core profile
context. Just run the example with

QT_QUICK_CORE_PROFILE=1 ./text

for e.g. The only ones that may not work out of the box are those
that provide GLSL shader source e.g. the customparticles or
shader effect examples. These work fine if the shader source is
adapted to GLSL 150 core.

In the future it may be a good idea to expose some context property
to QML that the user can use to determine what shader source
variation to provide to Qt Quick. Along these lines it would also
be very nice to allow the provision of shader source to
ShaderEffect or CustomParticle from a separate source file just as
we now do within Qt Quick.

Task-number: QTBUG-32050
Change-Id: Ia6e9f06dbb8508af9ae03c6b60fb418b4cc9e41f
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

A pointer list was not cleared when invalidating the context,
potentially holding dangling pointers after that.

Change-Id: I0618c54ffa67b31b115901e8be3a6d3cd16dc844
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

Change-Id: I12bc0bc475b3e99185aefcd58eef5a0fb5e9852e
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

This API is primarily a hook which is needed by the Qt WebEngine to
set up sharing with the scene graph's OpenGL contexts.

Change-Id: I5bb03abd9ab99f502db8e413fe838a8b30365b8d
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

Change-Id: I25311a2bd88f41087352e0a43ba505f4e27b7e85
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

See the task for the full reasoning behind this patch.

The threaded renderloop has been refactored to have one window per
thread. This is mostly a simplification of the current code path where
for loops over multiple windows are turned into if (window).

The QSGContext has been split into two classes, QSGRenderContext
for which there is one per OpenGLContext.

The rest of the patch is name changes and a couple of cleanups
in the hopes of simplifying this change.

Task-number: QTBUG-33993

Change-Id: I31c81f9694d7da7474a72333169be38de62613c4
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

createGlyphNode() and createNativeGlyphNode() kept calling each other
on GLES whenever QML_DISABLE_DISTANCEFIELD was set.

Change-Id: Ic1c2cfe0c4c7301f82cbbcce1cb512bd515b52ef
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

Materials are managed solely inside the renderer now, so these
are just wasting time.

Task-number: QTBUG-33456
Change-Id: Ie320df20b7971633c257b1bd3a218e7d70e52c3d
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

QSGContext::invalidate() is called from the QSGContext destructor,
but the atlas manager is only created if QSGContext::initialize()
is called, which may not always happen.

The result was a bunch of "QCoreApplication::postEvent: Unexpected
null receiver" messages during testing.

Change-Id: I11a294d48c06d687a9f82cf1ce825063cda8ecf6
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>