Begin cross platform support

src/engine/matrix.h

@@ -0,0 +1,16 @@
+#ifndef MATRIX_H
+#define MATRIX_H
+
+void matrix_mult_matrix(int size, const float matrix1[size][size],
+                        const float matrix2[size][size],
+                        float result[size][size]);
+void matrix_mult_vector(int size, const float matrix[size][size],
+                        const float vector[size], float result[size]);
+
+void create_axis_rotate_matrix(int axis, float angle,
+                               float rotate_matrix[3][3]);
+void create_rotate_matrix(const float rotate_speed[3],
+                          float rotate_matrix[3][3]);
+// void print_matrix(int size, float matrix[size][size]);
+
+#endif