Re: [FFmpeg-devel] [PATCH] hwcontext_vulkan: fix exporting multi-plane DRM modifiers

[Lynne <dev@lynne.ee>]

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On 03/05/2025 04:39, Russell Greene wrote:
> Is this documented anywhere? Should I maybe have a fixed sized stack
> buffer and fallback to an allocation if it's just a rule of thumb that
> it'll be less than some known small number. I just somehow doubt this
> is in the vulkan spec or any sort of guaranteed....



vkGetPhysicalDeviceToolPropertiesEXT(dev, nb, array)
If pToolProperties is NULL, then the number of tools currently active on 
physicalDevice is returned in pToolCount. Otherwise, pToolCount must 
point to a variable set by the application to the number of elements in 
the pToolProperties array, and on return the variable is overwritten 
with the number of structures actually written to pToolProperties. If 
pToolCount is less than the number of currently active tools, at most 
pToolCount structures will be written.

It's in the spec. Different function, but all functions which write to 
an array follow the same signature.

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