NAME
fglEdgeFlagPointer - define an array of edge flags
FORTRAN SPECIFICATION
SUBROUTINE fglEdgeFlagPointer( INTEGER*4 stride,
CHARACTER*8 pointer )
PARAMETERS
stride Specifies the byte offset between consecutive edge
flags. If stride is 0 (the initial value), the
edge flags are understood to be tightly packed in
the array.
pointer Specifies a pointer to the first edge flag in the
array.
DESCRIPTION
fglEdgeFlagPointer specifies the location and data format of
an array of boolean edge flags to use when rendering. stride
specifies the byte stride from one edge flag to the next
allowing vertexes and attributes to be packed into a single
array or stored in separate arrays. (Single-array storage
may be more efficient on some implementations; see
fglInterleavedArrays.)
When an edge flag array is specified, stride and pointer are
saved as client-side state.
To enable and disable the edge flag array, call
fglEnableClientState and
fglDisableClientState with the argument GL_EDGE_FLAG_ARRAY.
If enabled, the edge flag array is used when fglDrawArrays,
fglDrawElements, or fglArrayElement is called.
Use fglDrawArrays to construct a sequence of primitives (all
of the same type) from prespecified vertex and vertex
attribute arrays. Use fglArrayElement to specify primitives
by indexing vertexes and vertex attributes and
fglDrawElements to construct a sequence of primitives by
indexing vertexes and vertex attributes.
NOTES
fglEdgeFlagPointer is available only if the GL version is
1.1 or greater.
The edge flag array is initially disabled and it won't be
accessed when
fglArrayElement, fglDrawElements or fglDrawArrays is called.
Execution of fglEdgeFlagPointer is not allowed between the
execution of fglBegin and the corresponding execution of
fglEnd, but an error may or may not be generated. If no
error is generated, the operation is undefined.
fglEdgeFlagPointer is typically implemented on the client
side.
Edge flag array parameters are client-side state and are
therefore not saved or restored by fglPushAttrib and
fglPopAttrib. Use fglPushClientAttrib and
fglPopClientAttrib instead.
ERRORS
GL_INVALID_ENUM is generated if stride is negative.
ASSOCIATED GETS
fglIsEnabled with argument GL_EDGE_FLAG_ARRAY
fglGet with argument GL_EDGE_FLAG_ARRAY_STRIDE
fglGetPointerv with argument GL_EDGE_FLAG_ARRAY_POINTER
SEE ALSO
fglArrayElement, fglColorPointer, fglDrawArrays,
fglDrawElements, fglEnable, fglGetPointerv, fglIndexPointer,
fglNormalPointer, fglPopClientAttrib,
fglPushClientAttrib, fglTexCoordPointer, fglVertexPointer