Half of the in-tree HW-accelerated drivers lack geo shaders, not to mention out-of-tree drivers. I politely request that drivers not be required to have the geo shader hooks filled out; mesa st can detect this and enable extensions appropriately.
Posting from a mobile, pardon my terseness. ~ C. On Dec 25, 2009 8:16 AM, "Zack Rusin" <za...@vmware.com> wrote: On Friday 25 December 2009 07:03:02 Corbin Simpson wrote: > Isn't this incredibly at odds with our p... No, it's really not. We don't have caps for core features, e.g we don't have caps for vertex shaders and this goes hand in hand with that. Geometry shaders are optional in the pipeline meaning that unlike fragment shaders they can be absent in which case the pipeline behaves just like it would if the api didn't have geometry shaders exposed at all i.e. vertex shader outputs go directly do the fragment shader. So for games/apps that don't use geometry shaders this won't matter at all. And games/app that are so new that they actually check for geometry shaders will already be slow on i915 and r300 not because of geometry shaders, but because they're running on it on i915 or r300 =) Not to mention that this is not a fringe feature that will be present only in super high-end and futuristic hardware. All in all it's a bit like fixed-point hardware - programmable hardware is not a cap because it's what Gallium models. We can't just keep the Gallium interface at i915 level and mark everything above that as a cap, it'd be silly given that we're generations past that now. z
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