Neat-O! I am thrilled to have been able to contribute something useful
back to an open source project!
---
Thanks,
Dyweni
On 2013-06-05 19:36, DRC wrote:
> I've checked in support for the swap control extensions to the
> VirtualGL
> subversion trunk. Notable differences in my implementation relative
> to
> yours:
>
> -- The swap interval is treated as a per-window attribute, per the
> spec,
> and stored in the pbwin instance corresponding to the drawable.
> -- glXSwapIntervalSGI() has the same effect as calling
> glXSwapIntervalEXT() using the current drawable (also per the spec.)
> -- The timing mechanism in glXSwapBuffers() reuses the code from the
> VGL_FPS implementation.
> -- The virtual refresh rate is controlled via a new environment
> variable, VGL_REFRESHRATE. This variable is documented in the User's
> Guide. Since this variable is not a commonly-used configuration
> option
> for VGL, it is not included in vglrun or in the vglconfig GUI.
>
>
> On 6/4/13 4:07 PM, Dyweni - VirtualGL-Users wrote:
>>
>> Attached is the third version of the patch. This adds the following
>> functionality to VirtualGL 2.3.2:
>>
>> - Advertise support for the GLX Swap Control extensions
>> (GLX_EXT_swap_control, GLX_SGI_swap_control).
>> - Modify glXQueryDrawable() to intercept the attributes
>> 'GLX_SWAP_INTERVAL_EXT' and 'GLX_MAX_SWAP_INTERVAL_EXT' and return
>> our
>> simulated interval values.
>> - Modify glXSwapBuffers() to simulate the "sync to vblank"
>> functionality.
>> - Add glXSwapIntervalEXT() to set the glxSwapInterval (required for
>> the
>> GLX_EXT_swap_control extension).
>> - Modify glXSwapIntervalEXT() to set the glxSwapInterval (required
>> for
>> the GLX_SGI_swap_control extension).
>> - Modify VGLConfig to expose the "Emulated Monitor Refresh Rate"
>> setting.
>> - Modify VGLRUN to override the default value (60) of the "Emulated
>> Monitor Refresh Rate" setting.
>>
>>
>> ---
>> Thanks,
>> Dyweni
>>
>> On 2013-06-04 15:16, Dyweni - VirtualGL-Users wrote:
>>> Hi DRC,
>>>
>>> You are correct. Running vglrun with '-sp -fps 60' limits the 3D
>>> rendering rate as you described. The 3D rendering rate follows the
>>> -fps
>>> value. I didn't realize that -sp would lock the two rates together.
>>>
>>> I have another patch coming soon that implements
>>> GLX_SGI_swap_control /
>>> glXSwapIntervalSGI and perfects the delay within glXSwapBuffers.
>>>
>>>
>>> ---
>>> Thanks,
>>> Dyweni
>>>
>>>
>>> On 2013-06-04 14:13, DRC wrote:
>>>> Dyweni,
>>>>
>>>> I await your response on this before I proceed any further. I need
>>>> to
>>>> resolve the matter of whether you simply forgot to disable frame
>>>> spoiling (which is what I suspect, since your previous messages
>>>> made
>>>> no
>>>> mention of using the -sp switch to vglrun or setting VGL_SPOIL to
>>>> 0)
>>>> or
>>>> whether, for whatever reason, disabling it did not lock the 3D
>>>> rendering
>>>> rate to VGL_FPS (and if that's the case, I'm not sure I understand
>>>> how
>>>> that could happen.)
>>>>
>>>>
>>>>> You have to disable frame spoiling in order for the -fps option to
>>>>> limit
>>>>> the actual 3D rendering rate:
>>>>>
>>>>> Did you pass 'sp' to vglrun?
>>>>>
>>>>> vglrun -sp -fps {f} {application}
>>>>>
>>>>> I am more keen on the idea of implementing GLX_EXT_swap_control as
>>>>> opposed to implementing a separate frame rate governor, and I will
>>>>> look
>>>>> at your patch in detail. However, I also want to understand
>>>>> whether
>>>>> doing the above (using the existing frame rate governor without
>>>>> frame
>>>>> spoiling) accomplishes a similar effect and, if not, why not.
>>>>
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