Интерактивная система просмотра системных руководств (man-ов)
glArrayElement (3)
>> glArrayElement (3) ( Разные man: Библиотечные вызовы )
NAME
glArrayElement
- render a vertex using the specified vertex array element
C SPECIFICATION
void glArrayElement(
GLint i )
delim $$
PARAMETERS
i
Specifies an index into the enabled vertex data arrays.
DESCRIPTION
glArrayElement commands are used within glBegin/glEnd pairs to
specify vertex and attribute data for point, line, and polygon
primitives. If GL_VERTEX_ARRAY is enabled when glArrayElement is called, a
single vertex is drawn, using
vertex and attribute data taken from location i of the enabled
arrays. If GL_VERTEX_ARRAY is not enabled, no drawing occurs but
the attributes corresponding to the enabled arrays are modified.
Use glArrayElement to construct primitives by indexing vertex data, rather than
by streaming through arrays of data in first-to-last order. Because
each call specifies only a single vertex, it is possible to explicitly
specify per-primitive attributes such as a single normal per
individual triangle.
Changes made to array data between the execution of glBegin and the
corresponding execution of glEnd may affect calls to glArrayElement that are made
within the same glBegin/glEnd period in non-sequential ways.
That is, a call to
glArrayElement that precedes a change to array data may
access the changed data, and a call that follows a change to array data
may access original data.
NOTES
glArrayElement is available only if the GL version is 1.1 or greater.
glArrayElement is included in display lists. If glArrayElement is entered into a
display list, the necessary array data (determined by the array
pointers and enables) is also entered into the display list. Because
the array pointers and enables are client-side state, their values
affect display lists when the lists are created, not when the lists
are executed.
