tree 9a44831e45286c3d12413e9e09a2591f45eaf469
parent feb8d414445165b69a42ba071e8eb90242b22c2f
author Bill Hollings <bill.hollings@brenwill.com> 1626833584 -0400
committer Bill Hollings <bill.hollings@brenwill.com> 1626833584 -0400

Vulkan timestamp query pools use Metal GPU counters when available.

Add MVKPhysicalDeviceMetalFeatures::counterSamplingPoints
to track platform availability of GPU counters.
MVKPhysicalDevice creates and manages MTLCounterSets and checks for and enables
flags within MVKPhysicalDeviceMetalFeatures::counterSamplingPoints.
Add abstract MVKGPUCounterQueryPool class as parent of MVKTimestampQueryPool
and MVKPipelineStatisticsQueryPool concrete classes and refactor access to host
and command copy tracking data to allow extraction from MTLCounterSampleBuffer.
MVKTimestampQueryPool uses MTLCounterSampleBuffer if supported, otherwise reverts
to using host data for timestamps.
MVKCommandEncoder encodes Vulkan timestamp commands either as Metal staged or
command timestamps, depending on whether the GPU is tile-based or immediate-mode.
For Metal stage counters, we use a light-weight dummy BLIT encoder to mark
timestamp commands executed in the previous Metal encoding pass.
Add MVKDevice::getDummyBlitMTLBuffer() to supply a dummy single-byte buffer that
can be used by a stand-alone MTLBlitCommandEncoder as dummy work to mark timestamps.