glVertexPointer

GLVERTEXPOINTER(3G)					  GLVERTEXPOINTER(3G)



NAME
       glVertexPointer - define an array of vertex data


C SPECIFICATION
       void glVertexPointer( GLint size,
			     GLenum type,
			     GLsizei stride,
			     const GLvoid *ptr )


PARAMETERS
       size    Specifies  the number of coordinates per vertex; must be 2, 3,
	       or 4. The initial value is 4.

       type    Specifies the data type of each coordinate in the array.	 Sym-
	       bolic  constants GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE are
	       accepted. The initial value is GL_FLOAT.

       stride  Specifies the byte offset  between  consecutive	vertices.  If
	       stride  is 0, the vertices are understood to be tightly packed
	       in the array. The initial value is 0.

       ptr     Specifies a pointer to the first coordinate of the first	 ver-
	       tex in the array. The initial value is 0.

DESCRIPTION
       glVertexPointer specifies the location and data	of an array of vertex
       coordinates to use when rendering.  size specifies the number of coor-
       dinates	per  vertex and type the data type of the coordinates. stride
       specifies the byte stride from one vertex to the	 next  allowing	 ver-
       tices  and  attributes  to  be packed into a single array or stored in
       separate arrays.	 (Single-array storage may be more efficient on	 some
       implementations;	 see  glInterleavedArrays.)   When  a vertex array is
       specified, size, type, stride, and ptr are saved as client-side state.

       To enable and disable the vertex array, call glEnableClientState and
       glDisableClientState  with  the	argument GL_VERTEX_ARRAY. If enabled,
       the  vertex  array  is  used  when  glDrawArrays,  glDrawElements,  or
       glArrayElement is called.

       Use  glDrawArrays  to  construct	 a sequence of primitives (all of the
       same type) from prespecified vertex and vertex attribute arrays.	  Use
       glArrayElement  to  specify primitives by indexing vertices and vertex
       attributes  and glDrawElements to construct a sequence  of  primitives
       by indexing vertices and vertex attributes.

NOTES
       glVertexPointer is available only if the GL version is 1.1 or greater.

       The vertex  array  is  initially	 disabled  and	isn’t  accessed	 when
       glArrayElement, glDrawElements or glDrawArrays is called.

       Execution  of  glVertexPointer is not allowed between the execution of
       glBegin and the corresponding execution of glEnd, but an error may  or
       may not be generated. If no error is generated, the operation is unde-
       fined.

       glVertexPointer is typically implemented on the client side.

       Vertex array parameters are client-side state and  are  therefore  not
       saved	or   restored	by   glPushAttrib   and	  glPopAttrib.	  Use
       glPushClientAttrib and glPopClientAttrib instead.

ERRORS
       GL_INVALID_VALUE is generated if size is not 2, 3, or 4.

       GL_INVALID_ENUM is generated if type is is not an accepted value.

       GL_INVALID_VALUE is generated if stride is negative.

ASSOCIATED GETS
       glIsEnabled with argument GL_VERTEX_ARRAY
       glGet with argument GL_VERTEX_ARRAY_SIZE
       glGet with argument GL_VERTEX_ARRAY_TYPE
       glGet with argument GL_VERTEX_ARRAY_STRIDE
       glGetPointerv with argument GL_VERTEX_ARRAY_POINTER

SEE ALSO
       glArrayElement(3G),	 glColorPointer(3G),	    glDrawArrays(3G),
       glDrawElements(3G),   glDrawRangeElements(3G),  glEdgeFlagPointer(3G),
       glEnable(3G),	      glGetPointerv(3G),	  glIndexPointer(3G),
       glInterleavedArrays(3G),	 glNormalPointer(3G),  glPopClientAttrib(3G),
       glPushClientAttrib(3G), glTexCoordPointer(3G)



							  GLVERTEXPOINTER(3G)