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Assertion failure when using Metal GPU capture #1879

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schell opened this issue Aug 29, 2021 · 2 comments · Fixed by #5137
Closed

Assertion failure when using Metal GPU capture #1879

schell opened this issue Aug 29, 2021 · 2 comments · Fixed by #5137
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area: correctness We're behaving incorrectly
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WebGPU Specificat...

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@schell
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schell commented Aug 29, 2021

Description
While trying to take a GPU capture in Xcode I'm encountering an assertion failure:

-[MTLDebugRenderCommandEncoder validateCommonDrawErrors:instanceCount:baseInstance:maxVertexID:]:4185: failed assertion `instanceCount(0) must be non-zero.'

Platform
macos 11.5.2 (20G95)
wgpu 0.10.1
@schell schell changed the title Assertion failure when using Metal GPU caputer Assertion failure when using Metal GPU capture Aug 29, 2021
@kvark kvark added the area: correctness We're behaving incorrectly label Aug 29, 2021
@schell
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schell commented Aug 29, 2021 •
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Turns out this is valid, Not sure if this should be supported, but I was using 0..0 as the instance range in RenderPass::draw.

@schell schell closed this as completed Aug 29, 2021
@schell schell reopened this Aug 29, 2021
@kvark
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kvark commented Aug 29, 2021

We should support this, just ignoring the call if there are 0 intances.

@teoxoy teoxoy added this to the WebGPU Specification V1 milestone Dec 5, 2022
@nical nical mentioned this issue Jan 24, 2024
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area: correctness We're behaving incorrectly
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WebGPU Specification V1
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Discard draws when the instance/vertex/index count is zero nical/wgpu
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@schell @kvark @teoxoy