[Mesa-dev] [PATCH] nv50: implement multisample textures

Bryan Cain bryancain3 at gmail.com
Fri Oct 25 23:35:49 CEST 2013

On 10/25/2013 01:35 PM, Emil Velikov wrote:
> On 21/10/13 23:23, Bryan Cain wrote:
>> This is a port of 4da54c91d24da ("nvc0: implement multisample textures") to
>> nv50.
>> When coupled with the patch to only report 16 texture samplers (to fix
>> crashes), all of the Piglit tests in spec/arb_texture_multisample pass.
> Hello Bryan,
> Big thanks for your work. As promised here is a quick piglit summary on
> my nv96
> pass/fail/crash
> 69/32/27
> * dmesg does not spit anything nouveau related during the tests
> * any geometry shader related tests were skipped
> (piglit: info: Failed to create GL 3.2 core context)
> * all the crashes are due to the following assert
> codegen/nv50_ir_emit_nv50.cpp:1393:emitTEX: Assertion `argc <= 4' failed.
> PASS    arb_texture_multisample-*
> PASS    fb-completeness/*
> FAIL    sample-position/*
> FAIL    texelFetch fs sampler2DMS 4*
> CRASH   texelFetch fs sampler2DMSArray 4*
> FAIL    texelFetch/*-*s-isampler2DMS
> CRASH   texelFetch/*-*s-isampler2DMSArray
> PASS    textureSize/*
> Hope you find this useful :)
> No real world apps that use multisample textures were tested, yet.
> Cheers
> Emil

Hi Emil,

Thanks for testing on nv96.  It seems, though, that I messed up my
piglit-run command and didn't include all of the relevant tests as a
result.  Now that I've fixed that, I'm seeing the same failures and
crashes on my nva5.

It seems that multisampling is broken with texelFetch (both the
texelFetch and sample-position tests use it) but works otherwise, unless
it turns out not to produce the right results in real world applications
for pre-nva3 cards.

I'm going to take some time this weekend to see what's going on with
multisampling and texelFetch.

Thanks again,

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