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KhronosGroup / MoltenVK

MoltenVK is a Vulkan Portability implementation. It layers a subset of the high-performance, industry-standard Vulkan graphics and compute API over Apple's Metal graphics framework, enabling Vulkan applications to run on macOS, iOS and tvOS.
Apache License 2.0
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provoking vertex - is it supported? #2237

Open timprepscius opened 1 month ago

timprepscius commented 1 month ago

Hey there,

I think "provoking vertex' is not supported. Because the .def file doesn't include it as an extension.

And when I try to do the following (just ignore that it's pseudo code) it doesn't work:

    vku::DeviceMaker dm;
    dm.defaultLayers();
    // the extension doesn't seem to exist
//    dm.extension(VK_EXT_PROVOKING_VERTEX_EXTENSION_NAME);

// but let's just try anyway
    vk::PhysicalDeviceProvokingVertexFeaturesEXT provoking;
    provoking.setProvokingVertexLast(true);
    dm.enableCreateInfo((vku::DeviceMaker::DeviceCreateNode *)&provoking);

I just want to check before I go through and write some special case code to rearrange index orderings.

Thanks in advance.

cdavis5e commented 1 month ago

Nope. This is not supported yet.

I think there might be a Metal SPI[1] for this, since I'm pretty sure OpenGL on Apple Silicon does support it.

[1]: Service Provider Interface: Apple/IBM jargon for a private programming interface intended for use by other OS components.