glEdgeFlagPointer − define an array of edge flags
void glEdgeFlagPointer( GLsizei stride,
const GLvoid *ptr )
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.
Specifies a pointer to the first edge flag in the array. The initial value is zero.
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
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.
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
glArrayElement, glDrawElements or 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
GL_INVALID_ENUM is generated if stride is negative.
with argument GL_EDGE_FLAG_ARRAY
glGet with argument GL_EDGE_FLAG_ARRAY_STRIDE
glGetPointerv with argument GL_EDGE_FLAG_ARRAY_POINTER
glPushClientAttrib(3G), glTexCoordPointer(3G), glVertexPointer(3G)
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