glIndexPointerEXT.3gl
Digital Equipment Corporation OpenGL man pages

glIndexPointerEXT.3gl




Name

  glIndexPointerEXT - define an	array of color indexes


C Specification

  void glIndexPointerEXT( GLenum type,
			  GLsizei stride,
			  GLsizei count,
			  const	GLvoid *pointer	)


Parameters


  type	   Specifies the data type of each color index in the array.
	   Symbolic constants GL_SHORT,	GL_INT,	GL_FLOAT, or GL_DOUBLE_EXT,
	   are accepted.

  stride   Specifies the byte offset between consecutive color indexes.	 If
	   stride is zero the color indexes are	understood to be tightly
	   packed in the array.

  count	   Specifies the number	of indexes, counting from the first, that are
	   static.

  pointer  Specifies a pointer to the first index in the array.

Description

  glIndexPointerEXT specifies the location and data format of an array of
  color	indexes	to use when rendering using the vertex array extension. type 
  specifies the data type of each color index and stride gives the byte
  stride from one color index 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 color index array is specified, type, stride, 
  count and pointer are saved as client-side state, and static array elements 
  may be cached by the implementation.

  The color index array	is enabled and disabled	using glEnable and glDisable
  with the argument GL_INDEX_ARRAY_EXT.	If enabled, the	color index 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 color index array is disabled and it won't be accessed	when
  glArrayElementEXT or glDrawArraysEXT is called.


  Although it is not an error to call glIndexPointerEXT between the
  execution of glBegin and the corresponding execution of glEnd, the results
  are undefined.


  glIndexPointerEXT will typically be implemented on the client	side with no
  protocol.


  Since	the color index	array parameters are client side state,	they are not
  saved	or restored by glPushAttrib and	glPopAttrib.


  glIndexPointerEXT commands are not entered into display lists.


  glIndexPointerEXT 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_ENUM is generated if type is not an accepted value.

  GL_INVALID_VALUE is generated	if stride or count is negative.


Associated Gets

  glIsEnabled with argument GL_INDEX_ARRAY_EXT
  glGet	with argument GL_INDEX_ARRAY_SIZE_EXT
  glGet	with argument GL_INDEX_ARRAY_TYPE_EXT
  glGet	with argument GL_INDEX_ARRAY_STRIDE_EXT
  glGet	with argument GL_INDEX_ARRAY_COUNT_EXT
  glGetPointervEXT with	argument GL_INDEX_ARRAY_POINTER_EXT

See Also

  glArrayElementEXT, glColorPointerEXT,	glDrawArraysEXT,
  glEdgeFlagPointerEXT,	glGetPointervEXT, glNormalPointerEXT,
  glTexCoordPointerEXT,	glVertexPointerEXT, glEnable



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Last Edited: Fri Dec 6 11:18:03 EST 1996 by AFV
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