init commit

gui/gui.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+struct GLFWwindow;
+
+// One row for the extensible right-hand stats list (oil temp, coolant
+// temp, etc.) — push more entries onto EngineStats::extra_stats as the
+// sim grows, no Gui changes needed.
+struct StatEntry {
+    std::string label;
+    double value;
+    std::string unit;
+};
+
+// Plain data the GUI reads each frame. The GUI knows nothing about
+// Engine/Transmission/Vehicle — main.cpp fills this in from Simulation.
+struct EngineStats {
+    double rpm = 0.0;
+    double redline_rpm = 6500.0;  // tach gauge: start of red zone
+    double max_rpm = 8000.0;      // tach gauge: full scale
+
+    double fuel_consumption_lph = 0.0;
+    double crank_power_kw = 0.0;
+    double output_heat_j = 0.0;
+
+    std::vector<StatEntry> extra_stats;
+};
+
+class Gui {
+public:
+    bool init();                     // create window + ImGui context
+    bool begin_frame();               // returns false when the window should close
+    void render(const EngineStats& stats);
+    void end_frame();                 // swap buffers
+    void shutdown();
+
+private:
+    GLFWwindow* m_window = nullptr;
+};