Hi Corbin,
On Sat, Jan 30, 2010 at 1:06 PM, Corbin Simpson
<mostawesomed...@gmail.com>wrote:
> 5) ... Also, on the topic of framebuffers, is
> it okay to refuse to render if no MRTs or Z buffer are present?
>
Do you mean color-only and depth-only rendering? This is a must. Shadow
mapping heavily relies on depth-only rendering. OTOH post-processing effects
like HDR, bloom, depth of field, later parts of deferred-rendering methods,
and many other advanced methods require color-only rendering. The FBO
extensions allows either no color attachment or no depth-stencil attachment.
I know there are inter-CSO depedencies in r300g because of this, but I don't
see any other way around it.
6) GL_ARB_shadow_ambient and texture compare-fail values. A comment in
> the fragment constants reads, "Since Gallium doesn't support
> GL_ARB_shadow_ambient, this is always (0,0,0,0), right?"
I think the extension could be added to Gallium since the r300 compiler can
generate code for it.
Another
> comment reads, "Gallium doesn't provide us with any information
> regarding this mode, so we are screwed. I'm setting 0 = LUMINANCE,"
> above the texture compare modes. I don't really like that section of
> code, but it probably can't get cleaner, right?
>
Even though this is a rarely used feature in OpenGL nowadays, it should get
fixed if we want to be GL-compliant. That means adding depth texture modes
in pipe_sampler_state and setting them in the Mesa state tracker. The R300
compiler can already generate code for these modes as well.
7) Is there more information on the dual-source blend modes? I'm not
> sure if I can do them; might have to bug AMD for the register values.
>
I bet R300 can't do these modes. It's only a Direct3D 10.0 feature, not
present in Direct3D 10.1. MS must have a good reason to remove it.
BTW I looked at some of your patches and r3xx-r5xx cards don't even support
separate blend enables, therefore the cap should be 0. Or are you going to
emulate this using independent color channel masks and two rendering passes?
That could be done in the state tracker. Also, I think the indep. color
masks are r5xx-only.
Cheers.
Marek
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