Begin cross platform support

src/engine/vector.h

@@ -0,0 +1,11 @@
+#ifndef VECTOR_H
+#define VECTOR_H
+
+void vector_substruct(int size, const float v1[size], const float v2[size],
+                      float r[size]);
+void cross_product_vectors(const float v1[3], const float v2[3], float r[3]);
+float dot_product_vectors(const float v1[3], const float v2[3]);
+void vector_normalize(int size, const float v[size], float r[size]);
+// void print_vector(int size, float vector[size]);
+
+#endif