[Mesa-dev] [PATCH 1/5] include/GL: add mesa_glinterop.h for OpenGL-OpenCL interop (v3)

Emil Velikov emil.l.velikov at gmail.com
Fri Mar 11 23:20:03 UTC 2016


On 9 March 2016 at 18:17, Marek Olšák <maraeo at gmail.com> wrote:
> On Wed, Mar 9, 2016 at 6:58 PM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>> On 9 March 2016 at 17:28, Marek Olšák <maraeo at gmail.com> wrote:
>>> On Wed, Mar 9, 2016 at 4:47 PM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>>>> On 8 March 2016 at 15:39, Marek Olšák <maraeo at gmail.com> wrote:
>>>>> On Thu, Mar 3, 2016 at 11:56 PM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>>>>>> Hi Marek,
>>>>>>
>>>>>> A small question, and a few trivial suggestions. Hopefully I'm not too
>>>>>> late for the party.
>>>>>>
>>>>>> On 3 March 2016 at 19:46, Marek Olšák <maraeo at gmail.com> wrote:
>>>>>>
>>>>>>> +typedef struct _mesa_glinterop_device_info {
>>>>>>> +   uint32_t size; /* size of this structure */
>>>>>>> +
>>>>>> I believe Michel suggested a similar thing: Wouldn't it be better to
>>>>>> use a version one just like we do for the DRI extensions ? Many other
>>>>>> interfaces also use version, some with a combination of size, but this
>>>>>> is the first one in my experience that does only size.
>>>>>>
>>>>>>
>>>>>>> +typedef struct _mesa_glinterop_export_in {
>>>>>>
>>>>>>> +   /* Size of memory pointed to by out_driver_data. */
>>>>>>> +   uint32_t out_driver_data_size;
>>>>>>> +
>>>>>>> +   /* If the caller wants to query driver-specific data about the OpenGL
>>>>>>> +    * object, this should point to the memory where that data will be stored.
>>>>>>> +    */
>>>>>>> +   void *out_driver_data;
>>>>>> I take it that the structure and format of this data will be
>>>>>> internal/implementation specific, correct ? As on each side there will
>>>>>
>>>>> Yes.
>>>>>
>>>>>> be some sanity checking, wouldn't to be better to have size (version
>>>>>> and/or other) within that structure format.
>>>>>
>>>>> Since amdgpu isn't going to use this feature, I don't care too much about it.
>>>>>
>>>>> Having the size outside of the driver-specific structure seems safer.
>>>>>
>>>> Trying future proof things does not work nicely, most of the time.
>>>> Imho it should be added as there is a user for it.
>>>
>>> I agree, but:
>>> 1) Intel want it, so there is a future user.
>>> 2) One of our OpenCL guys and I have agreed to keep it in case we need
>>> in the future too.
>>>
>> Don't mean to sound snarky - two sentences, each consisting the word
>> "future" :-)
>> There was a song somewhere called "Tomorrow never comes".
>
> OK. If Intel say they don't want it, I'll remove it.
>
Pretty sure anyone can add it back as we get a user or two.

Thanks
Emil


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