glVertexPointerEXT.3gl








Name


  glVertexPointerEXT - define an array of vertex data





C Specification


  void glVertexPointerEXT( GLint size,

			   GLenum type,

			   GLsizei stride,

			   GLsizei count,

			   const GLvoid	*pointer )





Parameters




  size	   Specifies the number	of coordinates per vertex, must	be 2,3,	or 4.



  type	   Specifies the data type of each coordinate in the array.  Symbolic

	   constants GL_SHORT, GL_INT, GL_FLOAT, or GL_DOUBLE_EXT are

	   accepted.



  stride   Specifies the byte offset between consecutive vertexes. If stride

	   is 0	the vertexes are understood to be tightly packed in the

	   array.



  count	   Specifies the number	of vertexes, counting from the first, that

	   are static.



  pointer  Specifies a pointer to the first coordinate of the first vertex in

	   the array.



Description


  glVertexPointerEXT specifies the location and data format of an array of

  vertex coordinates to use when rendering using the vertex array extension.

  size specifies the number of coordinates per vertex and type the 

  data type of the coordinates. stride gives the byte stride from one vertex 

  to the next allowing vertexes and attributes to be packed into a single 

  array or stored in separate arrays. (Single-array storage may be more 

  efficient on some implementations.) count indicates the number of array 

  elements (counting from the first) that are static. Static elements may be 

  modified by the application, but once they are modified, the application 

  must explicitly respecify the array before using it for any rendering. When 

  a vertex array is specified, size, type, stride, count, and pointer are saved 

  as client-side state, and static array elements may be cached by the 

  implementation.



  The vertex array is enabled and disabled using glEnable and glDisable	with

  the argument GL_VERTEX_ARRAY_EXT. If enabled,	the vertex array is used when

  glDrawArraysEXT or glArrayElementEXT is called.



  Use glDrawArraysEXT to define	a sequence of primitives (all of the same

  type)	from pre-specified vertex and vertex attribute arrays.	Use

  glArrayElementEXT to specify primitives by indexing vertexes and vertex

  attributes.



Notes


  Non-static array elements are	not accessed until glArrayElementEXT or

  glDrawArraysEXT is executed.



  By default the vertex	array is disabled and it won't be accessed when

  glArrayElementEXT or glDrawArraysEXT is called.





  Although it is not an error to call glVertexPointerEXT between the

  execution of glBegin and the corresponding execution of glEnd, the results

  are undefined.





  glVertexPointerEXT will typically be implemented on the client side with no

  protocol.





  Since	the vertex array parameters are	client side state, they	are not	saved

  or restored by glPushAttrib and glPopAttrib.





  glVertexPointerEXT commands are not entered into display lists.





  glVertexPointerEXT is	part of	the EXT_vertex_array extension, not

  part of the core GL command set. If "GL_EXT_vertex_array" is

  included in the string returned by glGetString, when called with argument

  GL_EXTENSIONS, extension EXT_vertex_array is supported.





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 or count is negative.



Associated Gets


  glIsEnabled with argument GL_VERTEX_ARRAY_EXT

  glGet	with argument GL_VERTEX_ARRAY_SIZE_EXT

  glGet	with argument GL_VERTEX_ARRAY_TYPE_EXT

  glGet	with argument GL_VERTEX_ARRAY_STRIDE_EXT

  glGet	with argument GL_VERTEX_ARRAY_COUNT_EXT

  glGetPointervEXT with	argument GL_VERTEX_ARRAY_POINTER_EXT



See Also


  glArrayElementEXT, glColorPointerEXT,	glDrawArraysEXT,

  glEdgeFlagPointerEXT,	glGetPointervEXT, glIndexPointerEXT,

  glNormalPointerEXT, glTexCoordPointerEXT, glEnable






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Last Edited: Fri Feb 24, 1995

AFV