glCallLists.3gl

Name

  glCallLists -	execute	a list of display lists

C Specification

  void glCallLists( GLsizei n,
		    GLenum type,
		    const GLvoid *lists	)

Parameters

  n	 Specifies the number of display lists to be executed.


  type	 Specifies the type of values in lists.	 Symbolic constants GL_BYTE,
	 GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT,	GL_INT,
	 GL_UNSIGNED_INT, GL_FLOAT, GL_2_BYTES,	GL_3_BYTES, and	GL_4_BYTES
	 are accepted.


  lists	 Specifies the address of an array of name offsets in the display
	 list.	The pointer type is void because the offsets can be bytes,
	 shorts, ints, or floats, depending on the value of type.

Description

  glCallLists causes each display list in the list of names passed as lists
  to be	executed.  As a	result,	the commands saved in each display list	are
  executed in order, just as if	they were called without using a display
  list.	 Names of display lists	that have not been defined are ignored.

  glCallLists provides an efficient means for executing	display	lists.	type
  allows lists with various name formats to be accepted.  The formats are as
  follows:

  GL_BYTE		   lists is treated as an array	of signed bytes, each
			   in the range	-128 through 127.

  GL_UNSIGNED_BYTE	   lists is treated as an array	of unsigned bytes,
			   each	in the range 0 through 255.

  GL_SHORT		   lists is treated as an array	of signed two-byte
			   integers, each in the range -32768 through 32767.

  GL_UNSIGNED_SHORT	   lists is treated as an array	of unsigned two-byte
			   integers, each in the range 0 through 65535.

  GL_INT		   lists is treated as an array	of signed four-byte
			   integers.

  GL_UNSIGNED_INT	   lists is treated as an array	of unsigned four-byte
			   integers.

  GL_FLOAT		   lists is treated as an array	of four-byte
			   floating-point values.

  GL_2_BYTES		   lists is treated as an array	of unsigned bytes.
			   Each	pair of	bytes specifies	a single display-list
			   name.  The value of the pair	is computed as 256
			   times the unsigned value of the first byte plus
			   the unsigned	value of the second byte.

  GL_3_BYTES		   lists is treated as an array	of unsigned bytes.
			   Each	triplet	of bytes specifies a single display-
			   list	name.  The value of the	triplet	is computed
			   as 65536 times the unsigned value of	the first
			   byte, plus 256 times	the unsigned value of the
			   second byte,	plus the unsigned value	of the third
			   byte.

  GL_4_BYTES		   lists is treated as an array	of unsigned bytes.
			   Each	 quadruplet of bytes specifies a single
			   display-list	name.  The value of the	quadruplet is
			   computed as 16777216	times the unsigned value of
			   the first byte, plus	65536 times the	unsigned
			   value of the	second byte, plus 256 times the
			   unsigned value of the third byte, plus the
			   unsigned value of the fourth	byte.

  The list of display list names is not	null-terminated.  Rather, n specifies
  how many names are to	be taken from lists.

  An additional	level of indirection is	made available with the	glListBase
  command, which specifies an unsigned offset that is added to each display-
  list name specified in lists before that display list	is executed.

  glCallLists can appear inside	a display list.	 To avoid the possibility of
  infinite recursion resulting from display lists calling one another, a
  limit	is placed on the nesting level of display lists	during display-list
  execution.  This limit must be at least 64, and it depends on	the
  implementation.

  GL state is not saved	and restored across a call to glCallLists.  Thus,
  changes made to GL state during the execution	of the display lists remain
  after	execution is completed.	 Use glPushAttrib, glPopAttrib,	glPushMatrix,
  and glPopMatrix to preserve GL state across glCallLists calls.

Notes

  Display lists	can be executed	between	a call to glBegin and the
  corresponding	call to	glEnd, as long as the display list includes only
  commands that	are allowed in this interval.

Errors

  GL_INVALID_VALUE is generated	if n is	negative.

  GL_INVALID_ENUM is generated if type is not one of GL_BYTE,
  GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_INT, GL_UNSIGNED_INT,
  GL_FLOAT, GL_2_BYTES,	GL_3_BYTES, GL_4_BYTES.

Associated Gets

  glGet	with argument GL_LIST_BASE
  glGet	with argument GL_MAX_LIST_NESTING
  glIsList

See Also

  glCallList, glDeleteLists, glGenLists, glListBase, glNewList,	glPushAttrib,
  glPushMatrix

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