[SDL3] GPU: Investigate adding a Query API

[WoozChucky]

Not sure if other supported apis have the same concept of Vulkan's VkQueryPools, but would be great to have this exposed (via some SDL api wrapping) somehow to be able to query some gpu information.

[thatcosmonaut]

What's your use case? We would have to do some background research to identify a good cross-platform API surface for this.

[WoozChucky]

Mostly timing measurements in the rendering pipelines.

VK_CHECK(vkGetQueryPoolResults(device, queryPool, 0, ARRAYSIZE(queryResults), sizeof(queryResults), queryResults, sizeof(queryResults[0]), VK_QUERY_RESULT_64_BIT));

double frameGpuBegin = double(queryResults[0]) * props.limits.timestampPeriod * 1e-6;
double frameGpuEnd = double(queryResults[1]) * props.limits.timestampPeriod * 1e-6;

Once again, this might be too specific for Vulkan and troublesome/inexistent in other apis (I havent messed with Metal or DX at all).

[thatcosmonaut]

This is maybe doable but Metal only supports very coarse timing queries. I'll flag this for 3.x in case anyone wants to investigate this after 3.2 is released.