glTexCoordPointerEXT.3gl

Name

  glTexCoordPointerEXT - define	an array of texture coordinates

C Specification

  void glTexCoordPointerEXT( GLint size,
			     GLenum type,
			     GLsizei stride,
			     GLsizei count,
			     const GLvoid *pointer )

Parameters

  size	   Specifies the number	of coordinates per array element. It must be
	   1, 2, 3 or 4.

  type	   Specifies the data type of each texture coordinate.	Symbolic
	   constants GL_SHORT, GL_INT, GL_FLOAT, or GL_DOUBLE_EXT, are
	   accepted.

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

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

  pointer  Specifies a pointer to the first coordinate of the first element
	   in the array.

Description

  glTexCoordPointerEXT specifies the location and data format of an array of
  texture coordinates to use when rendering using the vertex array extension.  
  size specifies the number of coordinates per element, and must be 1, 2, 3, 
  or 4.  type specifies the data type of each texture coordinate and stride 
  gives the byte stride from one array element 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 texture coordinate 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 texture coordinate array is enabled and disabled using glEnable and
  glDisable with the argument GL_TEXTURE_COORD_ARRAY_EXT. If enabled, the
  texture coordinate 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 texture coordinate array is disabled and it won't be
  accessed when	glArrayElementEXT or glDrawArraysEXT is	called.


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


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


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


  glTexCoordPointerEXT commands	are not	entered	into display lists.


  glTexCoordPointerEXT 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 1, 2, 3,	or 4.

  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_TEXTURE_COORD_ARRAY_EXT
  glGet	with argument GL_TEXTURE_COORD_ARRAY_SIZE_EXT
  glGet	with argument GL_TEXTURE_COORD_ARRAY_TYPE_EXT
  glGet	with argument GL_TEXTURE_COORD_ARRAY_STRIDE_EXT
  glGet	with argument GL_TEXTURE_COORD_ARRAY_COUNT_EXT
  glGetPointervEXT with	argument GL_TEXTURE_COORD_ARRAY_POINTER_EXT

See Also

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

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