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+//
+// cocos2d (incomplete) GLU implementation
+//
+// gluLookAt and gluPerspective from:
+// http://jet.ro/creations (San Angeles Observation)
+// 
+// 
+
+// Only compile this code on iOS. These files should NOT be included on your Mac project.
+// But in case they are included, it won't be compiled.
+#import <Availability.h>
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+
+#import <OpenGLES/ES1/gl.h>
+#import <math.h>
+#import "../../Support/OpenGL_Internal.h"
+#include "glu.h"
+
+void gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
+{       
+        GLfloat xmin, xmax, ymin, ymax;
+                
+        ymax = zNear * (GLfloat)tanf(fovy * (float)M_PI / 360);
+        ymin = -ymax;
+        xmin = ymin * aspect;
+        xmax = ymax * aspect;
+                
+        glFrustumf(xmin, xmax,
+                                ymin, ymax,
+                                zNear, zFar);   
+}
+
+void gluLookAt(GLfloat eyex, GLfloat eyey, GLfloat eyez,
+                                          GLfloat centerx, GLfloat centery, GLfloat centerz,
+                                          GLfloat upx, GLfloat upy, GLfloat upz)
+{
+    GLfloat m[16];
+    GLfloat x[3], y[3], z[3];
+    GLfloat mag;
+        
+    /* Make rotation matrix */
+        
+    /* Z vector */
+    z[0] = eyex - centerx;
+    z[1] = eyey - centery;
+    z[2] = eyez - centerz;
+    mag = (float)sqrtf(z[0] * z[0] + z[1] * z[1] + z[2] * z[2]);
+    if (mag) {
+        z[0] /= mag;
+        z[1] /= mag;
+        z[2] /= mag;
+    }
+        
+    /* Y vector */
+    y[0] = upx;
+    y[1] = upy;
+    y[2] = upz;
+        
+    /* X vector = Y cross Z */
+    x[0] = y[1] * z[2] - y[2] * z[1];
+    x[1] = -y[0] * z[2] + y[2] * z[0];
+    x[2] = y[0] * z[1] - y[1] * z[0];
+        
+    /* Recompute Y = Z cross X */
+    y[0] = z[1] * x[2] - z[2] * x[1];
+    y[1] = -z[0] * x[2] + z[2] * x[0];
+    y[2] = z[0] * x[1] - z[1] * x[0];
+        
+    /* cross product gives area of parallelogram, which is < 1.0 for
+     * non-perpendicular unit-length vectors; so normalize x, y here
+     */
+        
+    mag = (float)sqrtf(x[0] * x[0] + x[1] * x[1] + x[2] * x[2]);
+    if (mag) {
+        x[0] /= mag;
+        x[1] /= mag;
+        x[2] /= mag;
+    }
+        
+    mag = (float)sqrtf(y[0] * y[0] + y[1] * y[1] + y[2] * y[2]);
+    if (mag) {
+        y[0] /= mag;
+        y[1] /= mag;
+        y[2] /= mag;
+    }
+        
+#define M(row,col)  m[col*4+row]
+    M(0, 0) = x[0];
+    M(0, 1) = x[1];
+    M(0, 2) = x[2];
+    M(0, 3) = 0.0f;
+    M(1, 0) = y[0];
+    M(1, 1) = y[1];
+    M(1, 2) = y[2];
+    M(1, 3) = 0.0f;
+    M(2, 0) = z[0];
+    M(2, 1) = z[1];
+    M(2, 2) = z[2];
+    M(2, 3) = 0.0f;
+    M(3, 0) = 0.0f;
+    M(3, 1) = 0.0f;
+    M(3, 2) = 0.0f;
+    M(3, 3) = 1.0f;
+#undef M
+        
+        glMultMatrixf(m);
+
+        
+    /* Translate Eye to Origin */
+    glTranslatef(-eyex, -eyey, -eyez);
+}
+
+#endif // __IPHONE_OS_VERSION_MAX_ALLOWED