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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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