[meta-freescale] [meta-fsl-arm PATCH 8/8] qt4: Enable OpenGL ES2 support for i.MX6

[Eric Nelson]

Thanks Leonardo,

BTW, I'm about to bail on the combination of Qt4/glimagesink 0.10.

The "client-draw-callback" property callbacks work pretty well, and
I was thinking that we could use that to write into Qt's EGL context
(if we could get one), but it seems that there's more to the picture.

In particular:
	-- This call to get the display is essentially hardcoded for
	/dev/FB0:
	 
https://bitbucket.org/Freescale/gstreamer-gst-plugins-gl/src/3554c07ead40c48620ac8e4864d81988d0b9476b/gst-libs/gst/gl/gstglwindow_fbES2.c?at=0.10#cl-314

	-- This call to eglSetCurrent() sets the display to black:
	https://bitbucket.org/Freescale/gstreamer-gst-plugins-gl/src/3554c07ead40c48620ac8e4864d81988d0b9476b/gst-libs/gst/gl/gstglwindow_fbES2.c?at=0.10#cl-372

And all of this appears to have been re-structured in upstream
master:
	http://cgit.freedesktop.org/gstreamer/gst-plugins-gl/tree/gst-libs/gst/gl

That said, if the OpenGL context in Qt4 isn't accessible, there's
no reason to compile it in.

On 08/01/2013 09:19 AM, Sandoval Gonzalez Leonardo-B42214 wrote:
> I think Francisco did not get last email.
>
> Francisco,
> please mention the testing you did.
>
> Leo
> ________________________________________
> From: otavio.salvador at gmail.com [otavio.salvador at gmail.com] on behalf of Otavio Salvador [otavio at ossystems.com.br]
> Sent: Wednesday, July 31, 2013 10:03 PM
> To: Eric Nelson
> Cc: meta-freescale Mailing List; Sandoval Gonzalez Leonardo-B42214; Carrillodominguez Francisco Alberto-B35153
> Subject: Re: [meta-freescale] [meta-fsl-arm PATCH 8/8] qt4: Enable OpenGL ES2 support for i.MX6
>
> On Tue, Jul 30, 2013 at 3:20 PM, Eric Nelson
> <eric.nelson at boundarydevices.com> wrote:
>> Hi all,
>>
>>
>> On 07/17/2013 11:17 AM, Otavio Salvador wrote:
>>>
>>> The Vivante libraries need some special linking as it has a more
>>> modular design which thus require a specific set of mkspec changes to
>>> make it to work. This change makes the linking to work when building
>>> against Vivante libraries for i.MX6 SoCs.
>>>
>>>
>>> <snip>
>>
>>>
>>>
>>> diff --git a/recipes-qt/qt4/qt4-x11-free_4.8.5.bbappend
>>> b/recipes-qt/qt4/qt4-x11-free_4.8.5.bbappend
>>> index 74bfb31..4c4d0c9 100644
>>> --- a/recipes-qt/qt4/qt4-x11-free_4.8.5.bbappend
>>> +++ b/recipes-qt/qt4/qt4-x11-free_4.8.5.bbappend
>>> @@ -9,6 +9,7 @@ PACKAGE_ARCH_mx5 = "${MACHINE_ARCH}"
>>>    QT_GLFLAGS_mx5 = "-opengl es2 -openvg"
>>>    QT_CONFIG_FLAGS_append_mx5 = " -I${STAGING_KERNEL_DIR}/include/"
>>>
>>> -DEPENDS_append_mx6 = " virtual/kernel"
>>> +DEPENDS_append_mx6 = " virtual/kernel virtual/libgles2"
>>>    PACKAGE_ARCH_mx6 = "${MACHINE_ARCH}"
>>> -QT_CONFIG_FLAGS_append_mx6 = " -I${STAGING_KERNEL_DIR}/include/"
>>> +QT_GLFLAGS_mx6 = "-opengl es2 -openvg"
>>> +QT_CONFIG_FLAGS_append_mx6 = " -I${STAGING_KERNEL_DIR}/include/ -DLINUX=1
>>> -DEGL_API_FB=1"
>>> diff --git a/recipes-qt/qt4/qt4/mx6/g++.conf
>>> b/recipes-qt/qt4/qt4/mx6/g++.conf
>>
>>
>> This patch seems to work perfectly for me, but I'm a bit confused
>> about what it actually enables in Qt.
>>
>> Neither the QGLWidget examples like hellogl_es2 or the QML-based
>> shadereffects demos seem to run.
>>
>> Is there a sample program that shows how to access OpenGL/ES from Qt?
>>
>> I'm trying to grok what the glue between glimagesink and a Qt
>> application should look like.
>
> I am adding Leonardo and Francisco, who did the tests on this, so they comment.
>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://projetos.ossystems.com.br
> Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750
>
>