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wgpu backend: --benchmark N parity with the GL minimal

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Stage 11 of the wgpu port. WgpuViewportWindow gains setBenchmarkFrames(N);
the minimal driver wires it to a --benchmark N flag. Renders N frames
after a 5-frame warmup, yaw-sweeping the camera at 0.5°/frame, captures
per-frame wall time with QElapsedTimer (cull + encode + present), and
prints avg/median/p1/p99 + last-frame stats in the same line format as
IfcViewerMinimal so a script can diff them line for line.

Per-frame stats (visible_objects, visible_triangles, sub_draws) are now
summed in render() from m.mesh_draws. hiz_rej reports 0 until stage 7
adds HiZ occlusion.

Verified on basic.ifc (3 instances): wgpu 11.68 ms avg vs GL 11.75 ms
avg — same scene, same camera sweep, same window size. Noise-level
delta as expected on a tiny scene; the interesting comparison is on
real BIM corpora once you bake them to v13 sidecars.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-05-27 14:14:40 +10:00
parent ddef8c65b5
commit 819196b3ce
3 changed files with 107 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/ifcviewer-wgpu/WgpuViewportWindow.h
+23
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@@ -83,6 +83,12 @@ public:
// parity testing against the GL backend.
void captureNextFrameToPng(const QString& path, bool quit_after = true);
// Benchmark mode: render N timed frames (after a small warmup), yaw-
// sweeping the camera at 0.5°/frame, then print a stats block on
// stderr and QCoreApplication::quit(). Mirrors the GL minimal's
// --benchmark output format so a script can diff them line for line.
void setBenchmarkFrames(int frames);
protected:
void exposeEvent(QExposeEvent* event) override;
void resizeEvent(QResizeEvent* event) override;
@@ -176,6 +182,23 @@ private:
// safe to dedicate to orbit for now.
Qt::MouseButton nav_active_button_ = Qt::NoButton;
QPoint nav_last_pos_;
// Benchmark mode. setBenchmarkFrames(N) arms it; render() integrates the
// yaw, captures per-frame ms after warmup, and prints + quits when the
// target frame count is hit.
int bench_total_ = 0;
int bench_count_ = 0;
int bench_warmup_ = 5;
float bench_yaw_start_ = 0.0f;
float bench_yaw_speed_ = 0.5f; // degrees per frame
std::vector<float> bench_frame_ms_;
// Per-frame stat snapshot from the last cull. Sum of m.mesh_draws across
// visible models. Exposed via the benchmark summary; will grow into a
// proper FrameStats signal when stage 11's host integration arrives.
uint32_t last_visible_objects_ = 0;
uint32_t last_visible_triangles_ = 0;
uint32_t last_sub_draws_ = 0;
};
#endif // WGPUVIEWPORTWINDOW_H