The render loop has been redesigned.
The OpenGL commands are queued instead of executed immediately.
updatePaintNode() now transfers the commands to the renderer,
which implements all OpenGL related things that used to be in
the Canvas class. The actual rendering is done in response to
beforeRendering signal in the render thread.

[ChangeLog][Renderer] OpenGL rendering moved to render thread.

Task-number: QTBUG-44953
Change-Id: Ibd5897e64b84b6c7ce169cece8293381eca94ab9
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

According to profiling the isOfType method used a lot of extra time
converting the classname attribute from const char to QString and back
to const char. This task fixes the attribute to be of type const char
to begin with, reducing the CPU usage of isOfType significantly.

Change-Id: Id4879c376701d2baf4fa28ca39e9fcc1c3c0b5d6
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

copyTexSubImage2D method was calling itself rather than the
intended glCopyTexSubImage2D method.

Change-Id: I3252dc0ea786c5c6d0d2be17a4ab593f29fad0e9
Task-number: QTBUG-45967
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Pixel size change was not signalled upon start causing HiDPI displays to
show incorrect rendering. Also fixed the signalling to occur when correct
OpenGL context has been made current.

Change-Id: I69b5e64d3641c81c98880fbe047d71930cc5a16c
Task-number: QTBUG-45692
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

- possible OUT_OF_MEMORY with canvas of MAX_VIEWPORT_DIMS
- extra methods for contexts

Change-Id: I807287692e200e08abac242d611bdce01a7136a5
Task-number: QTBUG-45728
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: Ibbaffb0567cbc66d39e9a6932f2fefea93f6aa96
Task-number: QTBUG-45695
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

At least on windows, trying to create a context with 0 alpha bits and
8 bits for other colors creates a context with 8 alpha bits.

Change-Id: I23659e4d47a0adee38249d85034a2bac41b84d1f
Task-number: QTBUG-45588
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I0008dffd4a919a17d2b6c3558790e197b55e7e4a
Task-number: QTBUG-45372
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I61aee0d1acb5e13cbabf4ec878054be470fc01c2
Task-number: QTBUG-45733
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I232893c201b45a6e2164c05b99c3c8170068376d
Task-number: QTBUG-45589
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

ReadPixels always read from renderFbo if context had antialiasing
specified.

Also added buffer initialization to zero so pixels that fall outside
the framebuffer contain correct value.

Change-Id: I58b9fda18bc56a64346f83ccda575c758e9eaac5
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I3f3db246c4d5243cfe92bb1e7c3ed9223feebcf1
Task-number: QTBUG-45729
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Task-number: QTBUG-45074
Task-number: QTBUG-45195
Change-Id: I00a9f300304c426aa49942af5111f1fc681c91c6
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I898ead7a6814aede70ff592c1e68e7cf5a197e2a
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

When calling readPixels from javascript, we need to blit the
antialiased fbo into the render fbo before we can read the pixel.

Change-Id: I342342f396c42f3d5320105552838cd7c99d1c4b
Task-number: QTBUG-45373
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I6528f3e3796ca0381de95d6b020a161ac996fa73
Task-number: QTBUG-45175
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I26bd2ef2cae4baa7786fc5479f8c5bff0ec17e2c
Task-number: QTBUG-45043
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Names of the initGL and renderGL signals have been changed to
initializeGL and paintGL in order to unify the naming of the API methods
with QOpenGLWidget component.

Change-Id: I074a7609347a3297dabcc4295fb92b9193cf00ed
Task-number: QTBUG-45665
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Titta Heikkala <titta.heikkala@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

Single signal to JavaScript side added (resizeGL) for uniform handling of resize events.
Added guards against multiple needRender calls getting queued for single repaint cycle.
Postponed deletion of old FBO objects until updatePaintNode() has been done.

Change-Id: I4da50b8bd0bb4b888c9e8233a45d58ec8aa9dcb6
Task-number: QTBUG-45657
Task-number: QTBUG-45658
Task-number: QTBUG-45648
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

Adds support for using S3TC and PVRTC formats with textures. This included
fixing the way currently bound textures were checked in the upload functions.

Change-Id: I1a362c2b43fa4c97f4fb7c50452c659eb4bdcafc
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Alpha attribute was ignored at getContext, even though alpha bits were
set based on the attribute.

Change-Id: Ibc6a4596f00ccebce8b828f8d579c3a8bf4346c7
Task-number: QTBUG-45371
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

    - Use 'Qt Canvas 3D' as the module name throughout the
      documentation.
    - Replace unnecessary use of \group with \page commands
    - Fix example group page not being generated correctly
    - Add QML types to the correct module, remove their use
      of \ingroup
    - Replace 'indexes' variable with 'depends' as this is
      no longer a module external to Qt.
    - Fix broken 'exampledirs'
    - Add correct dependencies and ensure linking to other
      Qt module docs works.
    - Style and language fixes
    - Limit line width to 80 characters in .qdoc files

Change-Id: Ib4f4ca59e250db3a5d60c4988701a8fb209438c1
Task-number: QTBUG-45247
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>

WebGL spec states: "If framebuffer is null, the default framebuffer
provided by the context is bound." Thus there is no need the check if
we have a self-bound framebuffer before querying its status from the
system.

Change-Id: I389d3e3b81ac61c6498a76ae07303caf75e2787e
Task-number: QTBUG-45197
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I8eed6f21102cd1f7d879416fa6ef992d8f678012
Task-number: QTBUG-45216
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I6a9dd7e326c90222b83bac90796a8ec10001400d
Task-number: QTBUG-45201
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

drawableSurfaceWidth/Height methods now respect maximum drawable
size and use physical (rendering target) rather than logical (QML layout)
pixel units.

Change-Id: Ice968e6ca541d20eb997eb8f6066df8f38c64666
Task-number: QTBUG-45236
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Original idea to generate unique id's for texture images from class pointer
doesn't compile on mingw, switching to generate the id with a simple
incremental uint value.

Change-Id: Ife3b268103bb28d1ab7722f8d312480e3b79391e
Task-number: QTBUG-45161
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Directory structure should be as in other modules.

Change-Id: I710c12d66450142f106d86f78cbdcc49df6dee55
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

There's no need to cast the logging context to call the const function
isDebugEnabled().

Change-Id: Iee8cbc07c4434ce9b560ffff13cd99f702512bc7
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Task-number: QTBUG-45073
Change-Id: Ic8ef7191b3e0fde3c5aca3966755af3e2d35e04c
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Fixes QTBUG-45070. Adds the SHORT enumeration
as accepted type value.

Change-Id: Ibd8ddd6c796320ebc233f0b667250536dd013e74
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Fixes QTBUG-44949

Change-Id: I538b98d71e8c2fcedb72c5ac8f0b806107884c87
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

getParameter now supports reading all values as per specification.
Added client side array check, default texture check and
checking of offset and stride requirements as per specification.

Change-Id: Ia04fc78ea741dbc5afbe969fac50d0253750b58a
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Fixes QTBUG-44834.

Change-Id: I75746e9908bb4a5409f61bec86c4a9e6b3eeee82
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Apps are free to enable attribute arrays and then dump the state before
binding a buffer via vertexAttribPointer. The state dumping code should
recognize this and avoid calling glGetBufferParameter since passing 0
(an invalid buffer) is an error.

Change-Id: Id3434b914281e9bd9d7157554ab6ef59558e292f
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

The replace from LGPL to LGPL21 was wrong, it was supposed to be LGPL3

This change amens e104354a



Change-Id: If542af9214d9cd109ae6af71bfaaab84d20f4172
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Change-Id: I460bc51d308e3743151e2fec6bfea2d197ff18d3
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Removing the unnecessary spaces from the log output.

Change-Id: Ifb662f317f8135d3c0892b28eccb29b2d55cace6
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Added storing and restoring of currently bound texture, clear color
and framebuffer when recreating the FBOs. When FBOs are created
they are now created with new id's to avoid changing FBOs and textures
that are being used in the CanvasRenderNode.

Change-Id: Ib1901a0031f4d7ee16b08bcd6fc4fac91a25fabe
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Creating a context that shares with a context that is current on another
thread is not safe, some drivers can reject this.

We work this around by astutely introducing an additional context that
lives on the same thread as the scenegraph's context, shares with it, but
is never current. The main thread's WebGL context will then share with
this extra context.

Task-number: QTBUG-44677
Change-Id: Ic3ba739c8cda4f4382705c19ed452e8e374c73d7
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>