I see! Thank you all.
On Tue, Aug 18, 2009 at 8:18 AM, Brian Paul <bri...@vmware.com> wrote:
> Cooper Yuan wrote:
>
>> I got it, thanks! Actually, in function st_init_clear(), if I set
>> bypass_vs_clip_and_viewport as 0, things get better.
>> Another question is about the function clear_with_quad() provided by
>> state tracker, this function can clear color/depth buffer through a quad,
>> but driver's pipe->clear can also implement the operation by filling a
>> furface, which one is prefered?
>>
>
> pipe->clear() is only used to clear whole buffers. The clear_with_quad()
> path is used when scissoring is enabled and only part of the buffer is
> actually cleared (or when using colormasking). When a whole buffer is
> cleared, some optimizations can be made depending on the underlying
> rendering architecture.
>
>
> Could you please tell me the difference between mesa/state tracker and
>> gallium/state tracker?
>>
>
> The mesa/state_tracker/ could be moved under gallium/state_trackers/ (or it
> could go under src/mesa/drivers/). It just wound up where it is because it
> was the first state tracker.
>
> -Brian
>
>
> Cooper
>> On Tue, Aug 18, 2009 at 6:49 AM, Keith Whitwell <kei...@vmware.com<mailto:
>> kei...@vmware.com>> wrote:
>>
>> On Tue, 2009-08-18 at 05:25 -0700, Cooper Yuan wrote:
>> > Hi,
>> >
>> > Does bypass_vs_clip_and_viewport influence vertex fetch?
>> > I thought vertex transform engine is behind vertex shader, that
>> means,
>> > bypass_vs_clip_and_viewport will not impact vertex fetch.
>> >
>> > But when I debug glClear issue on r500 gallium driver, if driver
>> > disable VTE, the color data can't be fetched (position is correct),
>> > enabled VTE can fetch color data successfully.
>> >
>> > Could anyone give me clues?
>>
>> All this flag means is that the state tracker is sending you
>> pre-transfomed (ie window-space) vertex positions. If it sends you
>> vertex x,y == 100,300 then one corner of your triangle is at that pixel
>> coordinate. It's basically the same case as if you've used the draw
>> module to do software transformation within the driver.
>>
>> That said, I think we remove the remaining usage of this functionality
>> from the Mesa state tracker - it's a serious corner case for the
>> open-source drivers.
>>
>> Keith
>>
>>
>>
>>
>>
>
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