From f039fabdd03cc423609df33e01b49799b7853aa0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ange-Marie=20MAURIN=20-=20A2M=20Syst=C3=A8mes?=
 <a-m.maurin@a2msystemes.org>
Date: Sat, 7 Nov 2026 16:46:29 +0100
Subject: [PATCH] feat(render): journal du rendu lance par Studio et images
 lentes signalees

Studio host passe --render-log (run\render-<port>.log) au Core ; sequa-render journalise toute image de plus de 250 ms avec la repartition du temps, pour diagnostiquer les fenetres Godot qui ne repondent plus.
---
 render/src/main.cpp                 | 20 ++++++++++++++++++++
 studio/host/app/src/studio_host.cpp |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/render/src/main.cpp b/render/src/main.cpp
index 6d179ee..fff34aa 100644
--- a/render/src/main.cpp
+++ b/render/src/main.cpp
@@ -168,7 +168,16 @@ int run(const Options& options)
                                               : std::chrono::microseconds(0);
     auto next_frame = Clock::now();
 
+    // Diagnostic : une image de plus de 250 ms est journalisée avec la répartition du temps
+    // (une fenêtre bloquée plus de 5 s est marquée « ne répond pas » par Windows).
+    constexpr auto slow_frame = std::chrono::milliseconds(250);
+    const auto ms_between = [](Clock::time_point from, Clock::time_point to) {
+        return static_cast<long long>(std::chrono::duration_cast<std::chrono::milliseconds>(to - from).count());
+    };
+
     for (std::uint64_t frame = 0;; ++frame) {
+        const auto t_begin = Clock::now();
+        std::size_t deltas = 0;
         for (render::CoreEvent& event : link.poll()) {
             if (auto* received = std::get_if<render::ReceivedDelta>(&event)) {
                 three_d::wire::SceneDeltaMessage* message = &received->message;
@@ -182,6 +191,7 @@ int run(const Options& options)
                     report_failure(link, "invalid-delta", error->message);
                     return exit_startup;
                 }
+                ++deltas;
                 const std::uint64_t sent = message->sent_at_us;
                 const std::uint64_t now = render::monotonic_us();
                 latency_us.push_back(received->received_at_us > sent ? received->received_at_us - sent : 0);
@@ -202,6 +212,7 @@ int run(const Options& options)
             return exit_lease;
         }
 
+        const auto t_polled = Clock::now();
         three_d::FrameRequest request;
         request.frame_index = frame;
         request.world_version = mirror.world_version();
@@ -216,6 +227,15 @@ int run(const Options& options)
             report_failure(link, "render-frame", error->message);
             return exit_startup;
         }
+        const auto t_rendered = Clock::now();
+        if (t_rendered - t_begin > slow_frame) {
+            std::fprintf(stderr,
+                         "sequa-render : image %llu lente, %lld ms (deltas recus et appliques : %zu en %lld ms, "
+                         "image du moteur : %lld ms)\n",
+                         static_cast<unsigned long long>(frame), ms_between(t_begin, t_rendered), deltas,
+                         ms_between(t_begin, t_polled), ms_between(t_polled, t_rendered));
+            std::fflush(stderr);
+        }
         cpu_ms.push_back(std::get<three_d::FrameResult>(outcome).measurements.cpu_ms);
         ++frames_since_report;
 
diff --git a/studio/host/app/src/studio_host.cpp b/studio/host/app/src/studio_host.cpp
index c5f463e..9c2a33e 100644
--- a/studio/host/app/src/studio_host.cpp
+++ b/studio/host/app/src/studio_host.cpp
@@ -142,6 +142,8 @@ std::string StudioHost::launch_core()
     for (const std::string& origin : config_.allowed_origins) {
         args.insert(args.end(), {"--allowed-origin", origin});
     }
+    // Journal du processus de rendu (Godot compris), à côté de celui du Core.
+    args.insert(args.end(), {"--render-log", sequa::platform::path_to_utf8(config_.run_dir / ("render-" + std::to_string(config_.core_port) + ".log"))});
     LaunchOptions launch;
     launch.own_console = config_.core_console;
     launch.log_path = log_file_path(config_.run_dir, config_.core_port);