fglArrayElement(3G) OpenGL Reference fglArrayElement(3G)NAMEfglArrayElement - render a vertex using the specified vertex array
element
FORTRAN SPECIFICATION
SUBROUTINE fglArrayElement( INTEGER*4 i )
PARAMETERS
i Specifies an index into the enabled vertex data arrays.
DESCRIPTIONfglArrayElement commands are used within fglBegin/fglEnd pairs to specify
vertex and attribute data for point, line, and polygon primitives. If
GL_VERTEX_ARRAY is enabled when fglArrayElement 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 fglArrayElement 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 fglBegin and the
corresponding execution of fglEnd may affect calls to fglArrayElement
that are made within the same fglBegin/fglEnd period in non-sequential
ways. That is, a call to
fglArrayElement 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.
NOTESfglArrayElement is available only if the GL version is 1.1 or greater.
fglArrayElement is included in display lists. If fglArrayElement 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.
SEE ALSO
fglColorPointer, fglDrawArrays, fglEdgeFlagPointer, fglGetPointerv,
fglIndexPointer, fglInterleavedArrays, fglNormalPointer,
fglTexCoordPointer, fglVertexPointer
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