Robert Bragg wrote:
> Hi,
>
> Every now and then while working on the Clutter toolkit we end up with
> glGet{Integer,Float}v in our profiles. Our typical response is to simply
> cache the offending state so as to avoid querying OpenGL, but it feels
> like this is papering over the problem.
>
> I've attached a patch that instead tries to address the performance
> problem in Mesa and hoping something like this could be accepted
> upstream?
Coincidentally, I was looking at this just recently.
It would be a good change to make. Though I think I'd add a new flag
to the StateVars table entries to indicate whether the state requires
validation (and what state). Then auto-generate the needed code.
So GL_RED_BITS case would be predicated like this:
case GL_RED_BITS:
if (ctx->NewState & _NEW_BUFFERS)
_mesa_update_state(ctx);
params[0] = ctx->DrawBuffer->Visual.redBits;
break;
_NEW_BUFFERS would be a new field in the StateVars list.
Most state queries don't need validation. The ones that do are the
ones that you patched plus the "current" attribs
(_NEW_CURRENT_ATTRIB). Maybe a few others?
Are you interested in coding this up?
-Brian
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