[PATCH 1/5] d3d10core/tests: Multisampled render targets are zeroed on creation.

[Stefan Dösinger]

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Am 2015-11-25 um 13:44 schrieb Henri Verbeet:
> You should check if the sample count is supported with
> CheckMultisampleQualityLevels().
My impression was that d3d10 mandates at least 4x MSAA support, though MSDN talks about FEATURE_LEVEL_10_1 devices. I guess it's a good idea to check anyway.

>> +    /* CopyResource from a multisampled to a sysmem texture works, but leaks memory on Windows
>> +     * (Nvidia, not checked on AMD). Use a single sampled buffer to work around. */
> Direct3D 10+ doesn't have sysmem textures. You can make resources
> accessible to the CPU, but you can't prevent the GPU from reading from
> them. How did you verify that the CopyResource() works?
An early version of this test called get_texture_color 640x480 times and died with E_OUTOFMEMORY on Windows. Adding the extra CopyResource step made the out of memory error go away.

> At least according to the documentation, CopyResource() doesn't work
> at all with multi-sampled resources, and this should use
> ResolveSubresource() instead. It's possible the documentation is wrong
> about that, but that would need a more convincing test. Right now it
> looks like the test only tests that the initial contents of "single"
> are zeroes.
Good point. I think I tested the code by clearing the multisampled texture and checking if I get a non-zero readback, but I'm not sure any more if I did this in the d3d10 version as well or only in the d3d9 version.

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