3 files changed, 33 insertions, 3 deletions

diff --git a/frontend/shared_cpp/MainLoop.cpp b/frontend/shared_cpp/MainLoop.cpp
index 82a24b5..09aa643 100644
--- a/frontend/shared_cpp/MainLoop.cpp
+++ b/frontend/shared_cpp/MainLoop.cpp
@@ -26,5 +26,6 @@ EM_BOOL loop(double time, void* loop) {
         mainLoop->numFrames = 0;
     }
 
-    return mainLoop->updateFunc(deltaTimeSeconds, NULL);
+    mainLoop->updateFunc(deltaTimeSeconds, NULL);
+    return true;
 }
\ No newline at end of file
diff --git a/frontend/shared_cpp/MainLoop.h b/frontend/shared_cpp/MainLoop.h
index 7300f6b..2573bb8 100644
--- a/frontend/shared_cpp/MainLoop.h
+++ b/frontend/shared_cpp/MainLoop.h
@@ -11,9 +11,9 @@ struct MainLoop {
     bool isRunning = false;
 	double lastTime = 0, elapsedTime = 0;
 	int numFrames = 0;
-	EM_BOOL (*updateFunc)(float dtSeconds, void *userData);
+	void (*updateFunc)(float dtSeconds, void *userData);
 
-    void run(EM_BOOL (*cb)(float dtSeconds, void *userData)) {
+    void run(void (*cb)(float dtSeconds, void *userData)) {
 		isRunning = true;
 		lastTime = 0;
 		elapsedTime = 0;
diff --git a/frontend/shared_cpp/mathlib.h b/frontend/shared_cpp/mathlib.h
index 7595045..2784f6a 100644
--- a/frontend/shared_cpp/mathlib.h
+++ b/frontend/shared_cpp/mathlib.h
@@ -2,6 +2,11 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <cmath>
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+#define ABS(x) (x < 0 ? -x : x)
 
 struct Vector2 {
     float x = 0;
@@ -11,6 +16,12 @@ struct Vector2 {
         return { x + other.x, y + other.y };
     }
 
+    Vector2& operator+=(Vector2 other) {
+        x += other.x;
+        y += other.y;
+        return *this;
+    }
+
     Vector2 operator-(Vector2 other) {
         return { x - other.x, y - other.y };
     }
@@ -19,6 +30,10 @@ struct Vector2 {
         return { x * s, y * s };
     }
 
+    Vector2 operator/(float s) {
+        return { x / s, y / s };
+    }
+
     float dot(Vector2 other) {
         return x * other.x + y * other.y;
     }
@@ -45,6 +60,20 @@ struct Vector2 {
     void printDebug(const char* name) {
         printf("%s=Vector2(%f, %f)\n", name, x, y);
     }
+
+    float determinant(Vector2 other) {
+        //
+        // [ a b ]
+        // [ c d ]
+        //
+        // [ x other.x ]
+        // [ y other.y ]
+        //
+        // det = a * d - b * c
+        // det = x * other.y - other.x * y
+        //
+        return x * other.y - other.x * y;
+    }
 };
 
 struct Vector3 {