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diff --git a/source/gles2n64/src/3DMath.cpp b/source/gles2n64/src/3DMath.cpp
new file mode 100644
index 0000000..bb684c7
--- /dev/null
+++ b/source/gles2n64/src/3DMath.cpp
@@ -0,0 +1,67 @@
+#include <math.h>
+
+static void MultMatrix_default( float m0[4][4], float m1[4][4],
+        float dest[4][4])
+{
+    int i;
+    for (i = 0; i < 4; i++)
+    {
+        dest[0][i] = m0[0][i]*m1[0][0] + m0[1][i]*m1[0][1] + m0[2][i]*m1[0][2] + m0[3][i]*m1[0][3];
+        dest[1][i] = m0[0][i]*m1[1][0] + m0[1][i]*m1[1][1] + m0[2][i]*m1[1][2] + m0[3][i]*m1[1][3];
+        dest[2][i] = m0[0][i]*m1[2][0] + m0[1][i]*m1[2][1] + m0[2][i]*m1[2][2] + m0[3][i]*m1[2][3];
+        dest[3][i] = m0[3][i]*m1[3][3] + m0[2][i]*m1[3][2] + m0[1][i]*m1[3][1] + m0[0][i]*m1[3][0];
+    }
+}
+
+static void TransformVectorNormalize_default(float vec[3], float mtx[4][4])
+{
+    float len;
+
+    vec[0] = mtx[0][0] * vec[0]
+           + mtx[1][0] * vec[1]
+           + mtx[2][0] * vec[2];
+    vec[1] = mtx[0][1] * vec[0]
+           + mtx[1][1] * vec[1]
+           + mtx[2][1] * vec[2];
+    vec[2] = mtx[0][2] * vec[0]
+           + mtx[1][2] * vec[1]
+           + mtx[2][2] * vec[2];
+    len = vec[0]*vec[0] + vec[1]*vec[1] + vec[2]*vec[2];
+    if (len != 0.0)
+    {
+        len = sqrtf(len);
+        vec[0] /= len;
+        vec[1] /= len;
+        vec[2] /= len;
+    }
+}
+
+static void Normalize_default(float v[3])
+{
+    float len;
+
+    len = (float)(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
+    if (len != 0.0)
+    {
+        len = (float)sqrt( len );
+        v[0] /= (float)len;
+        v[1] /= (float)len;
+        v[2] /= (float)len;
+    }
+}
+
+static float DotProduct_default( float v0[3], float v1[3] )
+{
+    float dot;
+    dot = v0[0]*v1[0] + v0[1]*v1[1] + v0[2]*v1[2];
+    return dot;
+}
+
+
+void (*MultMatrix)(float m0[4][4], float m1[4][4], float dest[4][4]) =
+        MultMatrix_default;
+void (*TransformVectorNormalize)(float vec[3], float mtx[4][4]) =
+        TransformVectorNormalize_default;
+void (*Normalize)(float v[3]) = Normalize_default;
+float (*DotProduct)(float v0[3], float v1[3]) = DotProduct_default;
+