Ilia Mirkin <imir...@alum.mit.edu> writes: > On Fri, Aug 28, 2015 at 6:58 AM, Francisco Jerez <curroje...@riseup.net> > wrote: >> Ilia Mirkin <imir...@alum.mit.edu> writes: >> >>> This should include everything. I sent a test for textureSamples to >>> piglit a while ago, not sure how to test imageSamples -- apparently ms >>> images aren't entirely supported on i965? But I'm not sure via what >>> feat that happens. >>> >> i965 doesn't support MS images because on Gen7-8 it would involve either >> converting all MS textures to UMS on the fly or implementing the >> compressed MS layout in software, which would be even more madness. On >> Gen9 and up though it's supported natively by the hardware and it >> shouldn't be too difficult to implement, I just haven't had the chance >> to do the work yet. > > Yeah, I've heard that before, but... what exactly prevents one from > using a 2DMS image? I didn't see anything that checked if the images > were MS. > You can declare and use a multisample image uniform, but image loads will always return zero and writes will be ignored because the image unit state will be considered invalid (see validate_image_unit() in shaderimage.c). Not sure if imageSamples() is expected to do something in particular when the image unit state is invalid, the spec doesn't seem to be explicit about it...
> -ilia
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