[Mesa-dev] gallium: blitters and scissors

[Corbin Simpson]

Yes, that particular part of the spec is fairly Poulsboriffic. Does any open
hardware have a scissor enable/disable bit?

Sending from a mobile, pardon the brevity. ~ C.

On Oct 12, 2010 8:47 PM, "Dave Airlie" <airlied at gmail.com> wrote:
> On Wed, Oct 13, 2010 at 1:07 PM, Dave Airlie <airlied at gmail.com> wrote:
>> On Wed, Oct 13, 2010 at 12:07 PM, Dave Airlie <airlied at gmail.com> wrote:
>>> I've noticed that none of the blitters use scissor state, and wondered
>>> if there was a reason for this.
>>>
>>> It looks like drivers are expected to setup scissor state in the
>>> framebuffer setup and in the set scissor state, but with r600g due to
>>> the underlying state tracking it can end up doing the wrong thing.
>>>
>>> The 3 patches add CSO cache + u_blit + u_blitter scissor usage.
>>>
>>> Just wondering if I'm violating some rules of the gallium interface or
not.
>>
>> I realised this was a quite deep hole I started digging in mesa/st,
>> any advice on whether cleaning it up is a good idea?
>>
>
> Okay so it helps to read the docs, since it the scissor state enable
> relies on a bit in the rasterizer state.
>
> So it looks like we should always set scissor regs in the framebuffer
> state and only modify them if we notice
> the rasterizer bit is enabled.
>
> Dave.
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