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glEdgeFlagPointer — define an array of edge flags
void glEdgeFlagPointer( | GLsizei | stride, |
| const GLvoid * | pointer); |
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.
pointerSpecifies a pointer to the first edge flag in the array. The initial value is 0.
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.
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.
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
glArrayElement, glBindBuffer, glColorPointer, glDisableClientState, glDrawArrays, glDrawElements, glDrawRangeElements, glEdgeFlag, glEnableClientState, glFogCoordPointer, glIndexPointer, glInterleavedArrays, glMultiDrawArrays, glMultiDrawElements, glNormalPointer, glPopClientAttrib, glPushClientAttrib, glSecondaryColorPointer, glTexCoordPointer, glVertexAttribPointer, glVertexPointer
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/.