89 lines
4.0 KiB
Rust
89 lines
4.0 KiB
Rust
//! The viewer on the GPU compositor (egui_kittest with wgpu): frames composited on the GPU match
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//! the CPU viewer. Skips without a GPU adapter (CI). Set `EC_SNAPSHOT_DIR` to keep PNGs.
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use effectcraft_engine::Session;
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use effectcraft_ui_egui::EffectcraftApp;
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use egui_kittest::Harness;
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use serde_json::json;
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fn settle(h: &mut Harness<'_, EffectcraftApp>) {
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for _ in 0..600 {
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h.step();
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if h.state().frames.inflight() == 0 && h.state().frames.last_ms.lock().map(|v| *v > 0.0).unwrap_or(false) {
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break;
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}
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std::thread::sleep(std::time::Duration::from_millis(20));
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}
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for _ in 0..4 {
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h.step();
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}
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}
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/// egui_kittest's wgpu setup on the adapter the headless compositor picked (`name (Backend)`),
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/// like the desktop app's window. Left alone, egui_kittest prefers a CPU adapter, which on
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/// Windows is WARP on DirectX 12, where FXC fails to compile the compositor's kernels: the
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/// viewer would stay on the CPU and the comparison would never run.
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fn same_adapter(name: String) -> eframe::egui_wgpu::WgpuSetup {
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let mut setup = egui_kittest::wgpu::default_wgpu_setup();
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if let eframe::egui_wgpu::WgpuSetup::CreateNew(c) = &mut setup {
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let fallback = c.native_adapter_selector.take();
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c.native_adapter_selector = Some(std::sync::Arc::new(move |adapters, surface| {
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let named = |a: &&eframe::wgpu::Adapter| format!("{} ({:?})", a.get_info().name, a.get_info().backend) == name;
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match (adapters.iter().find(named), &fallback) {
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(Some(a), _) => Ok(a.clone()),
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(None, Some(f)) => f(adapters, surface),
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(None, None) => adapters.first().cloned().ok_or_else(|| "No adapter found".to_owned()),
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}
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}));
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}
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setup
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}
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#[test]
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fn viewer_draws_gpu_frames_that_match_the_cpu() {
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let Some(probe) = effectcraft_gpu::Gpu::headless() else {
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eprintln!("no GPU adapter: skipping");
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return;
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};
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let adapter = effectcraft_engine::render::Accelerator::name(&probe);
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eprintln!("headless compositor adapter: {adapter}");
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// egui-wgpu creates its GL device with WebGL2's limits, which the compositor declines.
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let gl = adapter.ends_with("(Gl)");
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drop(probe);
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let mut s = Session::default();
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s.execute("file.openDemoProject", json!({})).unwrap();
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s.execute("time.set", json!({"time": 2.0})).unwrap();
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let mut h = Harness::builder()
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.with_size(egui::vec2(1400.0, 900.0))
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.with_pixels_per_point(1.0)
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.wgpu_setup(same_adapter(adapter))
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.build_eframe(|_| EffectcraftApp::new(s));
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settle(&mut h);
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if gl && h.state().gpu_adapter().is_none() {
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eprintln!("egui-wgpu's GL device has WebGL2 limits: the viewer stays on the CPU, skipping");
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return;
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}
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assert!(h.state().gpu_adapter().is_some(), "GPU compositor on egui-wgpu's device");
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eprintln!("viewer compositor adapter: {:?}", h.state().gpu_adapter());
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let gpu_px = h.state_mut().viewer_pixels().expect("read back the GPU frame");
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let gpu_shot = h.render().expect("render");
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// Mercury Software Only: the same frame from the CPU.
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h.state_mut().session.execute("render.backend", json!({"backend": "cpu"})).unwrap();
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settle(&mut h);
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let cpu_px = h.state_mut().viewer_pixels().expect("CPU frame");
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let cpu_shot = h.render().expect("render");
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assert_eq!(gpu_px.size, cpu_px.size);
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let mut worst = 0i32;
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let mut over = 0usize;
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for (a, b) in gpu_px.pixels.iter().zip(&cpu_px.pixels) {
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let d = a.to_array().iter().zip(b.to_array()).map(|(x, y)| (*x as i32 - y as i32).abs()).max().unwrap_or(0);
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worst = worst.max(d);
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over += usize::from(d > 1);
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}
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assert!(over * 1000 <= gpu_px.pixels.len() * 3 && worst <= 4, "viewer GPU vs CPU: {over} pixels > 1/255, worst {worst}/255");
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if let Ok(d) = std::env::var("EC_SNAPSHOT_DIR") {
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gpu_shot.save(format!("{d}/ui_gpu_viewer.png")).unwrap();
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cpu_shot.save(format!("{d}/ui_cpu_viewer.png")).unwrap();
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}
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}
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