Expand description
Per-pass GPU timing on Vulkan via TIMESTAMP queries. The slot layout is the
shared one (crate::render::pass_timing); this module only re-exports it so the
backend keeps its crate::render::vulkan::pass_timing path.
The start buffer resets the whole block and writes the whole-frame start; each per-pass command buffer writes its own pair around its encode; the end buffer writes the whole-frame end.
Unlike D3D12 (which can pre-write every slot so a pass that did not run still
reads a value), Vulkan forbids writing a timestamp to a query that is already
written without an intervening reset. A pass absent from this frame’s graph
therefore leaves its reset-but-unwritten slots unavailable; the readback
uses WITH_AVAILABILITY and reports 0 for any pair that is not both
available.
Re-exports§
pub use crate::render::pass_timing::*;