glEdgeFlagPointerEXT(3G) OpenGL Reference glEdgeFlagPointerEXT(3G)
NAME
glEdgeFlagPointerEXT - define an array of edge flags
C SPECIFICATION
void glEdgeFlagPointerEXT( GLsizei stride,
GLsizei count,
const GLboolean *pointer )
PARAMETERS
stride Specifies the byte offset between consecutive edge flags. If
stride is zero the edge flags are understood to be tightly
packed in the array.
count Specifies the number of edge flags, counting from the first,
that are static.
pointer Specifies a pointer to the first edge flag in the array.
DESCRIPTION
glEdgeFlagPointerEXT specifies the location and data format of an array
of boolean edge flags to use when rendering using the vertex array
extension. stride gives 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.) count indicates the number of array elements
(counting from the first) that are static. Static elements may be
modified by the application, but once they are modified, the application
must explicitly respecify the array before using it for any rendering.
When an edge flag array is specified, stride, count and pointer are saved
as client-side state, and static array elements may be cached by the
implementation.
The edge flag array is enabled and disabled using glEnable and glDisable
with the argument GLEDGEFLAGARRAYEXT. If enabled, the edge flag array
is used when glDrawArraysEXT or glArrayElementEXT is called.
Use glDrawArraysEXT to define a sequence of primitives (all of the same
type) from pre-specified vertex and vertex attribute arrays. Use
glArrayElementEXT to specify primitives by indexing vertexes and vertex
attributes.
NOTES
Non-static array elements are not accessed until glArrayElementEXT or
glDrawArraysEXT is executed.
By default the edge flag array is disabled and it won't be accessed when
glArrayElementEXT or glDrawArraysEXT is called.
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glEdgeFlagPointerEXT(3G) OpenGL Reference glEdgeFlagPointerEXT(3G)
Although it is not an error to call glEdgeFlagPointerEXT between the
execution of glBegin and the corresponding execution of glEnd, the
results are undefined.
glEdgeFlagPointerEXT will typically be implemented on the client side
with no protocol.
Since the edge flag array parameters are client side state, they are not
saved or restored by glPushAttrib and glPopAttrib.
glEdgeFlagPointerEXT commands are not entered into display lists.
glEdgeFlagPointerEXT is part of the EXTvertexarray extension, not part
of the core GL command set. If GLEXTvertexarray is included in the
string returned by glGetString, when called with argument GLEXTENSIONS,
extension EXTvertexarray is supported.
ERRORS
GLINVALIDENUM is generated if stride or count is negative.
ASSOCIATED GETS
glIsEnabled with argument GLEDGEFLAGARRAYEXT
glGet with argument GLEDGEFLAGARRAYSTRIDEEXT
glGet with argument GLEDGEFLAGARRAYCOUNTEXT
glGetPointervEXT with argument GLEDGEFLAGARRAYPOINTEREXT
MACHINE DEPENDENCIES
On RealityEngine, RealityEngine2, and VTX systems, do not enable or
disable GLVERTEXARRAY, GLVERTEXARRAYEXT, GLNORMALARRAY,
GLNORMALARRAYEXT, GLCOLORARRAY, GLCOLORARRAYEXT,
GLINDEXARRAY,GLINDEXARRAYEXT, GLTEXTURECOORDARRAY,
GLTEXTURECOORDARRAYEXT, GLEDGEFLAGARRAY or GLEDGEFLAGARRAYEXT
between a call to glNewList and the corresponding call to glEndList.
Instead, enable or disable before the call to glNewList.
SEE ALSO
glArrayElementEXT, glColorPointerEXT, glDrawArraysEXT, glEnable,
glGetPointervEXT, glIndexPointerEXT, glNormalPointerEXT,
glTexCoordPointerEXT, glVertexPointerEXT
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