glCallLists
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 more
than one display list. 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,
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