Added simple vertex shader demo....

third_party/gles2_book/Common/Include/esUtil.h

 //
 // Book:      OpenGL(R) ES 2.0 Programming Guide
 // Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
 // ISBN-10:   0321502795
 // ISBN-13:   9780321502797
 // Publisher: Addison-Wesley Professional
 // URLs:      http://safari.informit.com/9780321563835
 //            http://www.opengles-book.com
 //
 
@@ skipping 77 matching lines @@
 ///        the results in the arrays.  Generate index list for a TRIANGLE_STRIP
 /// \param numSlices The number of slices in the sphere
 /// \param vertices If not NULL, will contain array of float3 positions
 /// \param normals If not NULL, will contain array of float3 normals
 /// \param texCoords If not NULL, will contain array of float2 texCoords
 /// \param indices If not NULL, will contain the array of indices for the triangle strip
 /// \return The number of indices required for rendering the buffers (the number of indices stored in the indices array
 ///         if it is not NULL ) as a GL_TRIANGLE_STRIP
 //
 extern int esGenSphere ( int numSlices, float radius, GLfloat **vertices, GLfloat **normals, 
-                         GLfloat **texCoords, GLuint **indices );
+                         GLfloat **texCoords, GLushort **indices );
 
 //
 /// \brief Generates geometry for a cube.  Allocates memory for the vertex data and stores 
 ///        the results in the arrays.  Generate index list for a TRIANGLES
 /// \param scale The size of the cube, use 1.0 for a unit cube.
 /// \param vertices If not NULL, will contain array of float3 positions
 /// \param normals If not NULL, will contain array of float3 normals
 /// \param texCoords If not NULL, will contain array of float2 texCoords
 /// \param indices If not NULL, will contain the array of indices for the triangle strip
 /// \return The number of indices required for rendering the buffers (the number of indices stored in the indices array
 ///         if it is not NULL ) as a GL_TRIANGLES
 //
 extern int esGenCube ( float scale, GLfloat **vertices, GLfloat **normals, 
-                       GLfloat **texCoords, GLuint **indices );
+                       GLfloat **texCoords, GLushort **indices );
 
 //
 /// \brief Loads a 24-bit TGA image from a file
 /// \param fileName Name of the file on disk
 /// \param width Width of loaded image in pixels
 /// \param height Height of loaded image in pixels
 ///  \return Pointer to loaded image.  NULL on failure. 
 //
 extern char* esLoadTGA ( char *fileName, int *width, int *height );
 
@@ skipping 59 matching lines @@
 //// \brief return an indentity matrix 
 //// \param result returns identity matrix
 //
 extern void esMatrixLoadIdentity(ESMatrix *result);
 
 #ifdef __cplusplus
 }
 #endif  // __cplusplus
 
 #endif // ESUTIL_H