The OpenGL Graphics System: A Specification

2.8. VERTEX ARRAYS 26
should be normalized when converted to floating-point. If normalized is TRUE,
fixed-point data are converted as specified in table 2.9; otherwise, the fixed-point
values are converted directly.
The one, two, three, or four values in an array that correspond to a single vertex
comprise an array element. The values within each array element are stored sequentially
in memory. If stride is specified as zero, then array elements are stored
sequentially as well. The error INVALID VALUE is generated if stride is negative.
Otherwise pointers to the ith and (i + 1)st elements of an array differ by stride
basic machine units (typically unsigned bytes), the pointer to the (i + 1)st element
being greater. For each command, pointer specifies the location in memory of the
first value of the first element of the array being specified.
An individual array is enabled or disabled by calling one of
void EnableClientState( enum array );
void DisableClientState( enum array );
with array set to VERTEX ARRAY, NORMAL ARRAY, COLOR ARRAY,
SECONDARY COLOR ARRAY, INDEX ARRAY, EDGE FLAG ARRAY,
FOG COORD ARRAY, or TEXTURE COORD ARRAY, for the vertex, normal, color,
secondary color, color index, edge flag, fog coordinate, or texture coordinate array,
respectively.
An individual generic vertex attribute array is enabled or disabled by calling
one of
void EnableVertexAttribArray( uint index );
void DisableVertexAttribArray( uint index );
where index identifies the generic vertex attribute array to enable or disable.
The error INVALID VALUE is generated if index is greater than or equal to
MAX VERTEX ATTRIBS.
The command
void ClientActiveTexture( enum texture );
is used to select the vertex array client state parameters to be modified by
the TexCoordPointer command and the array affected by EnableClientState and
DisableClientState with parameter TEXTURE COORD ARRAY. This command sets
the client state variable CLIENT ACTIVE TEXTURE. Each texture coordinate set
has a client state vector which is selected when this command is invoked. This
state vector includes the vertex array state. This call also selects the texture
coordinate set state used for queries of client state.
Version 2.0 - October 22, 2004