Working reusable simulation loop

1 files changed, 30 insertions, 0 deletions

diff --git a/frontend/shared_cpp/MainLoop.cpp b/frontend/shared_cpp/MainLoop.cpp
new file mode 100644
index 0000000..82a24b5
--- /dev/null
+++ b/frontend/shared_cpp/MainLoop.cpp
@@ -0,0 +1,30 @@
+#include "MainLoop.h"
+#include <cstdio>
+#include <cstdlib>
+
+EM_BOOL loop(double time, void* loop) {
+    MainLoop* mainLoop = (MainLoop*) loop;
+    if (!mainLoop->isRunning) {
+        return false;
+    }
+    
+    if (mainLoop->lastTime == 0) {
+        mainLoop->lastTime = time;
+        return true;
+    }
+
+    long deltaTime = time - mainLoop->lastTime;
+    mainLoop->lastTime = time;
+    mainLoop->elapsedTime += deltaTime;
+    mainLoop->numFrames++;
+    float deltaTimeSeconds = static_cast<float>(deltaTime) / 1000.f;
+
+    if (mainLoop->elapsedTime >= 1000.0) {
+        printf("FPS: %d\n", mainLoop->numFrames);
+
+        mainLoop->elapsedTime = 0.0;
+        mainLoop->numFrames = 0;
+    }
+
+    return mainLoop->updateFunc(deltaTimeSeconds, NULL);
+}
\ No newline at end of file