2003-2004 Silicon Graphics, Inc.
glWeightPointer 3G
glWeightPointer glWeightPointerOES define an array of weights

## C Specification

void `glWeightPointerOES` GLint size GLenum type GLsizei stride const GLvoid * pointer

## Parameters

size

  Specifies the number of weights per vertex. Must be is less than or equal to `GL_MAX_VERTEX_UNITS_OES`. The initial value is `0`.

type

  Specifies the data type of each weight in the array. Symbolic constant `GL_FIXED` is accepted. However, the common profile also accepts the symbolic constant `GL_FLOAT` as well. The initial value is `GL_FIXED` for the common lite profile, or `GL_FLOAT` for the common profile.

stride

  Specifies the byte offset between consecutive weights. If stride is 0, the weights are understood to be tightly packed in the array. The initial value is `0`.

pointer

  Specifies a pointer to the first weight of the first vertex in the array. The initial value is `0`.

## Description

`glWeightPointer` specifies the location and data of an array of weights to use when rendering. size specifies the number of weights per vertex and type the data type of the coordinates. stride specifies the byte stride from one weight 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.)

These weights are used to blend corresponding matrices for a given vertex.

When a weights array is specified, size, type, stride, and pointer are saved as client-side state.

If the weights array is enabled, it is used when glDrawArrays, or glDrawElements is called. To enable and disable the weights array, call glEnableClientState and glDisableClientState with the argument `GL_WEIGHT_ARRAY_OES`. The weights array is initially disabled and isn't accessed when glDrawArrays or glDrawElements is called.

Use glDrawArrays to construct a sequence of primitives (all of the same type) from prespecified vertex and vertex attribute arrays. Use glDrawElements to construct a sequence of primitives by indexing vertices and vertex attributes.

## Notes

`glWeightPointer` is typically implemented on the client side.

## Errors

`GL_INVALID_VALUE` is generated if size is greater than `GL_MAX_VERTEX_UNITS_OES`.

`GL_INVALID_ENUM` is generated if type is not an accepted value.

`GL_INVALID_VALUE` is generated if stride is negative.

## See Also

glCurrentPaletteMatrix, glDrawArrays, glDrawElements, glLoadPaletteFromModelViewMatrix, glMatrixIndexPointer, glMatrixMode,

## Copyright

Copyright 2003-2004 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.