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Index for Section 3G |
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Alphabetical listing for G |
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glEdgeFlagPointer(3G)
NAME
glEdgeFlagPointer - define an array of edge options
SYNOPSIS
void glEdgeFlagPointer(
GLsizei stride,
const GLboolean *pointer );
PARAMETERS
stride
Specifies the byte offset between consecutive edge options. If stride
is 0 (the initial value), the edge options are understood to be tightly
packed in the array. The initial value is 0.
pointer
Specifies a pointer to the first edge option in the array. The initial
value is zero.
DESCRIPTION
glEdgeFlagPointer() specifies the location and data of an array of boolean
edge options to use when rendering. stride specifies the byte stride from
one edge option 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; see glInterleavedArrays().)
When an edge option array is specified, stride and pointer are saved as
client-side state.
To enable and disable the edge option array, call glEnableClientState() and
glDisableClientState() with the argument GL_EDGE_FLAG_ARRAY. If enabled,
the edge option 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 vertexes and vertex
attributes and glDrawElements() to construct a sequence of primitives by
indexing vertexes and vertex attributes.
NOTES
glEdgeFlagPointer() is available only if the GL version is 1.1 or greater.
The edge option array is initially disabled and it won't be accessed when
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 option 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
SEE ALSO
glArrayElement(3), glColorPointer(3), glDrawArrays(3), glDrawElements(3),
glEnable(3), glGetPointerv(3), glIndexPointer(3), glNormalPointer(3),
glPopClientAttrib(3), glPushClientAttrib(3), glTexCoordPointer(3),
glVertexPointer(3)
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Index for Section 3G |
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Alphabetical listing for G |
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Top of page |
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