1991-2006 Silicon Graphics, Inc.

glEdgeFlagPointer

3G

glEdgeFlagPointer

define an array of edge flags

# C Specification

                    void glEdgeFlagPointer
                    GLsizei stride
                    const GLvoid * pointer

## Parameters

`stride`

- Specifies the byte offset between consecutive edge flags. If `stride` is 0, the edge flags are understood to be tightly packed in the array. The initial value is 0.

`pointer`

- Specifies a pointer to the first edge flag in the array. The initial value is 0.

## Description

`glEdgeFlagPointer` 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 vertices and attributes to be packed into a single array or stored in separate arrays.

If a non-zero named buffer object is bound to the `GL_ARRAY_BUFFER` target (see

glBindBuffer

) while an edge flag array is specified, `pointer` is treated as a byte offset into the buffer object's data store. Also, the buffer object binding (`GL_ARRAY_BUFFER_BINDING`) is saved as edge flag vertex array client-side state (`GL_EDGE_FLAG_ARRAY_BUFFER_BINDING`).

When an edge flag array is specified, `stride` and `pointer` are saved as client-side state, in addition to the current vertex array buffer object binding.

To enable and disable the edge flag array, call

glEnableClientState

and

glDisableClientState

with the argument `GL_EDGE_FLAG_ARRAY`. If enabled, the edge flag array is used when

glDrawArrays

,

glMultiDrawArrays

,

glDrawElements

,

glMultiDrawElements

,

glDrawRangeElements

, or

glArrayElement

is called.

## Notes

`glEdgeFlagPointer` is available only if the GL version is 1.1 or greater.

Edge flags are not supported for interleaved vertex array formats (see

glInterleavedArrays

).

The edge flag array is initially disabled and isn't accessed when

glArrayElement

,

glDrawElements

,

glDrawRangeElements

,

glDrawArrays

,

glMultiDrawArrays

, or

glMultiDrawElements

is called.

Execution of `glEdgeFlagPointer` is not allowed between the execution of

glBegin

and the corresponding execution of

glEnd

, but an error may or may not be generated. If no error is generated, the operation is undefined.

`glEdgeFlagPointer` is typically implemented on the client side.

Edge flag array parameters are client-side state and are therefore not saved or restored by

glPushAttrib

and

glPopAttrib

. Use

glPushClientAttrib

and

glPopClientAttrib

instead.

## Errors

`GL_INVALID_ENUM` is generated if `stride` is negative.

## Associated Gets

glIsEnabled

with argument `GL_EDGE_FLAG_ARRAY`

glGet

with argument `GL_EDGE_FLAG_ARRAY_STRIDE`

glGet

with argument `GL_EDGE_FLAG_ARRAY_BUFFER_BINDING`

glGet

with argument `GL_ARRAY_BUFFER_BINDING`

glGetPointerv

with argument `GL_EDGE_FLAG_ARRAY_POINTER`

## See Also

glArrayElement

,

glBindBuffer

,

glColorPointer

,

glDisableClientState

,

glDrawArrays

,

glDrawElements

,

glDrawRangeElements

,

glEdgeFlag

,

glEnableClientState

,

glFogCoordPointer

,

glIndexPointer

,

glInterleavedArrays

,

glMultiDrawArrays

,

glMultiDrawElements

,

glNormalPointer

,

glPopClientAttrib

,

glPushClientAttrib

,

glSecondaryColorPointer

,

glTexCoordPointer

,

glVertexAttribPointer

,

glVertexPointer

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.