glCallLists(3G)glCallLists(3G)NAMEglCallLists - execute a list of display lists
SYNOPSIS
void glCallLists(
GLsizei n,
GLenum type,
const GLvoid *lists );
PARAMETERS
Specifies the number of display lists to be executed. 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. 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.
DESCRIPTIONglCallLists() 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 more than one
display list. type allows lists with various name formats to be
accepted. The formats are as follows: lists is treated as an array of
signed bytes, each in the range -128 through 127. lists is treated as
an array of unsigned bytes, each in the range 0 through 255. lists is
treated as an array of signed two-byte integers, each in the range
-32768 through 32767. lists is treated as an array of unsigned two-
byte integers, each in the range 0 through 65535. lists is treated as
an array of signed four-byte integers. lists is treated as an array of
unsigned four-byte integers. lists is treated as an array of four-byte
floating-point values. 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. lists is treated as an
array of unsigned bytes. Each triplet of bytes specifies a single dis‐
play-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. lists is
treated as an array of unsigned bytes. Each quadruplet of bytes speci‐
fies a single display-list name. The value of the quadruplet is com‐
puted 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 speci‐
fies how many names are to be taken from lists.
An additional level of indirection is made available with the glList‐
Base() 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 possibil‐
ity 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(), glPopAt‐
trib(), glPushMatrix(), and glPopMatrix() to preserve GL state across
glCallLists() calls.
NOTES
Display lists can be executed between a call to glBegin() and the cor‐
responding 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 GETSglGet() with argument GL_LIST_BASE
glGet() with argument GL_MAX_LIST_NESTING
glIsList()SEE ALSOglCallList(3), glDeleteLists(3), glGenLists(3), glListBase(3),
glNewList(3), glPushAttrib(3), glPushMatrix(3)glCallLists(3G)
