From 58488f8eabcc61089e0ae4297f38f10cc28d78c7 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <mattkae@protonmail.com>
Date: Sat, 27 Mar 2021 11:49:56 -0400
Subject: Working reusable simulation loop

---
 frontend/shared_cpp/MainLoop.cpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 frontend/shared_cpp/MainLoop.cpp

(limited to 'frontend/shared_cpp/MainLoop.cpp')

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
-- 
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