GLEDGEFLAGPOINTER - Online Linux Manual Page

Section : 3G

NAME

"glEdgeFlagPointer − define an array of edge flags

C SPECIFICATION

void glEdgeFlagPointer

( GLsizei

stride

const GLvoid

*ptr

)

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. The initial value is 0.

ptr

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

DESCRIPTION

glEdgeFlagPointer

specifies the location and data 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. (Single-array storage may be more efficient on some implementations; see

glInterleavedArrays

When an edge flag array is specified, stride

and

ptr

are saved as client-side state.

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

glDrawElements

, or

glArrayElement

is called.

Use glDrawArrays

to construct a sequence of primitives (all of the same type) from prespecified vertex and vertex attribute arrays. Use

glArrayElement

to specify primitives by indexing vertices and vertex attributes and

glDrawElements

to construct a sequence of primitives by indexing vertices and vertex attributes.

NOTES

glEdgeFlagPointer

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
glArrayElement

glDrawElements

glDrawArrays

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

glGetPointerv

with argument

GL_EDGE_FLAG_ARRAY_POINTER