[vlc-devel] [PATCH] [RFC] pixel shader to write I420 data in NV12 textures

Steve Lhomme robux4 at videolabs.io
Wed Mar 25 18:25:25 CET 2015

On Wed, Mar 25, 2015 at 6:24 PM, Steve Lhomme <robux4 at videolabs.io> wrote:
> On Wed, Mar 25, 2015 at 6:00 PM, Jean-Baptiste Kempf <jb at videolan.org> wrote:
>> On 25 Mar, Steve Lhomme wrote :
>>> Direct3D11 doesn't support writing pixel formats in 3 planes.
>>> So we write the U & V planes in the second texture, like for NV12 but use a pixel
>>> shader to remap the values.
>> Why do you convert them to RGB?
> Because the rest of the code was already using shaders for formats the
> GPU is supposed to support.
> I'll try without and see if it helps. IMO it should work without
> shaders out of the box when we write the proper pixel format.

It may be down to how the texture and related code is initialized
though. I don't fully understand the whole thing (yet).


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