Struct GpuTimestamps 

pub struct GpuTimestamps { /* private fields */ }

GPU timestamp query set — wraps wgpu::QuerySet for per-pass GPU timing.

Only functional when the device supports Features::TIMESTAMP_QUERY.

Examples

use mabda::profiler::GpuTimestamps;

let timestamps = GpuTimestamps::new(&device, 8); // up to 8 passes
// Write timestamps around render passes, then resolve and read

Implementations

impl GpuTimestamps

pub fn new(device: &Device, queue: &Queue, max_passes: u32) -> Option<Self>

Create GPU timestamp queries. Returns None if the device doesn’t support timestamps.

pub fn query_set(&self) -> &QuerySet

Get the query set for use in render/compute pass descriptors.

pub fn max_passes(&self) -> u32

Maximum number of query pairs (passes) supported.

pub fn resolve(&self, encoder: &mut CommandEncoder, query_count: u32)

Resolve queries and copy to read buffer. Call after all passes are submitted.

pub fn read_results(&self, device: &Device, query_count: u32) -> Vec<f64>

Read back timestamp results. Blocking — call after queue.submit + device.poll.

Returns durations in milliseconds for each pass (begin→end pair).