init commit

main.cpp

@@ -0,0 +1,50 @@
+#include <chrono>
+#include "imgui.h"
+#include "engine/simulation.h"
+#include "gui/gui.h"
+
+int main() {
+    Gui gui;
+    if (!gui.init()) return 1;
+
+    Simulation sim;
+    const double SIM_DT = 1.0 / 360.0;
+    double accumulator = 0.0;
+
+    auto last_time = std::chrono::steady_clock::now();
+
+    while (gui.begin_frame()) {
+        // 'r' resets the engine (rpm -> 0). false = don't auto-repeat while held.
+        if (ImGui::IsKeyPressed(ImGuiKey_R, false)) {
+            sim.engine().reset();
+        }
+
+        auto now = std::chrono::steady_clock::now();
+        double frame_time = std::chrono::duration<double>(now - last_time).count();
+        last_time = now;
+        if (frame_time > 0.25) frame_time = 0.25; // clamp huge stalls (e.g. breakpoint)
+
+        accumulator += frame_time;
+        while (accumulator >= SIM_DT) {
+            sim.step(SIM_DT);
+            accumulator -= SIM_DT;
+        }
+
+        // Build this frame's display data. Only rpm is real right now;
+        // the rest are placeholders until those models exist.
+        EngineStats stats;
+        stats.rpm = sim.engine().rpm();
+        stats.fuel_consumption_lph = 0.0; // TODO: derive from fuel model
+        stats.crank_power_kw = 0.0;       // TODO: torque_nm * rpm -> kW
+        stats.output_heat_j = 0.0;        // TODO: energy balance / exhaust heat model
+
+        stats.extra_stats.push_back({"Oil Temp", 0.0, "C"});
+        stats.extra_stats.push_back({"Coolant Temp", 0.0, "C"});
+
+        gui.render(stats);
+        gui.end_frame();
+    }
+
+    gui.shutdown();
+    return 0;
+}