[Mesa-stable] [Mesa-dev] [PATCH 05/14] meta: Abort meta pbo path if readpixels need signed-unsigned conversion

[Jason Ekstrand]

On Fri, Jun 19, 2015 at 1:40 PM, Anuj Phogat <anuj.phogat at gmail.com> wrote:
> On Tue, Jun 16, 2015 at 9:21 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
>>
>> On Jun 16, 2015 11:15, "Anuj Phogat" <anuj.phogat at gmail.com> wrote:
>>>
>>> Without this patch, piglit test fbo_integer_readpixels_sint_uint fails,
>>> when
>>> forced to use the meta pbo path.
>>>
>>> Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
>>> Cc: <mesa-stable at lists.freedesktop.org>
>>> ---
>>>  src/mesa/drivers/common/meta_tex_subimage.c | 3 +++
>>>  1 file changed, 3 insertions(+)
>>>
>>> diff --git a/src/mesa/drivers/common/meta_tex_subimage.c
>>> b/src/mesa/drivers/common/meta_tex_subimage.c
>>> index 00364f8..84cbc50 100644
>>> --- a/src/mesa/drivers/common/meta_tex_subimage.c
>>> +++ b/src/mesa/drivers/common/meta_tex_subimage.c
>>> @@ -283,6 +283,9 @@ _mesa_meta_pbo_GetTexSubImage(struct gl_context *ctx,
>>> GLuint dims,
>>>
>>>        if (_mesa_need_rgb_to_luminance_conversion(rb->Format, format))
>>>           return false;
>>> +
>>> +      if (_mesa_need_signed_unsigned_int_conversion(rb->Format, format,
>>> type))
>>> +         return false;
>>
>> Hrm... This seems fishy.  Isn't glBlitFramebuffers supposed to handle format
>> conversion with integers?  If so we should probably fix it rather than just
>> skip it for the meta pbo path.
>>
> As discussed offline, here is relevant text for glBlitFrameBuffer() from
> OpenGL 4.5 spec, section 18.3.1:
> "An INVALID_OPERATION error is generated if format conversions are not
> supported, which occurs under any of the following conditions:
> -The read buffer contains fixed-point or floating-point values and any draw
>   buffer contains neither fixed-point nor floating-point values.
> -The read buffer contains unsigned integer values and any draw buffer does
>   not contain unsigned integer values.
> - The read buffer contains signed integer values and any draw buffer does
>   not contain signed integer values."
>
> I'll add a comment here explaining the reason to avoid meta path.

Thanks!  With that added,

Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>

>>>     }
>>>
>>>     /* For arrays, use a tall (height * depth) 2D texture but taking into
>>> --
>>> 1.9.3
>>>
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