Add GPU timestamp queries for per-pass profiling#153
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Extend the RHI with QuerySet, timestamp query methods, and copy_buffer_to_buffer so the renderer can measure per-pass GPU time via wgpu timestamp queries. The CPU Profiler now distinguishes Cpu vs Gpu sections and GPU timings appear in the same frame summary. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
QuerySet,create_query_set,resolve_query_set,timestamp_period_ns,read_timestamp_buffer, andcopy_buffer_to_buffermethodsProfileSectionKind(Cpu/Gpu) to the profiler so GPU and CPU timings coexist inframe_summary()GpuTimerStateto the renderer with 1-frame-delayed readback (shadow + PBR passes instrumented)supports_timestamp_queriestoHardwareSurveyandtimestamp_querytoCapabilitiesQuerySet = ()with no-op defaultsTest plan
cargo test --workspace-- all tests pass (including 3 new profiler tests)cargo clippy --workspace -- -D warnings-- zero warningscargo fmt --all -- --check-- formatted🤖 Generated with Claude Code