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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