From: Eric Nelson <eric.nelson@boundarydevices.com>
To: Jason Anderson <janderson@disti.com>, meta-freescale@yoctoproject.org
Subject: Re: Enabling transparency on overlay surface
Date: Fri, 07 Nov 2014 13:03:27 -0700 [thread overview]
Message-ID: <545D258F.1060203@boundarydevices.com> (raw)
In-Reply-To: <b0ea261a-7bc1-4e49-9f72-121d296cf29d@disti.com>
Hi Jason,
On 11/07/2014 12:11 PM, Jason Anderson wrote:
> HI,
>
> I am working on an OpenGL ES application and trying to use /dev/fb1 as
> an overlay on my i.MX6 (Boundary Devices BD-SL-i.MX6) . My current
> image is Yocto 1.6 , 3.10.17 kernel.
>
> I have my app rendering my background to /dev/fb0 and my overlay to
> /dev/fb1, but I can’t get fb1 transparency enabled. Does any have have
> an example of how to use the overlay with OpenGL ES/EGL?
>
The fb1 transparency doesn't have anything to do with OpenGL,
but is available using a set of custom ioctls on the frame-buffer
device.
In particular, look at MXCFB_SET_GBL_ALPHA and MXCFB_SET_CLR_KEY:
https://github.com/boundarydevices/linux-imx6/blob/boundary-imx_3.10.17_1.0.2_ga/drivers/video/mxc/mxc_ipuv3_fb.c#L1029
The MXCFB_SET_OVERLAY_POS ioctl is also very useful for placing
fb1 on top of fb0.
Regards,
Eric
next prev parent reply other threads:[~2014-11-07 20:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-07 19:11 Enabling transparency on overlay surface Jason Anderson
2014-11-07 20:03 ` Eric Nelson [this message]
2014-11-10 14:30 ` Jason Anderson
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