glMatrixIndexPointer

define an array of matrix indices

Signature

glMatrixIndexPointerOES( GLint ( size ) , GLenum ( type ) , GLsizei ( stride ) , const void * ( pointer ) )-> void

Parameters

VariablesDescription
size
Specifies the number of matrix indices 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 matrix index in the array. Symbolic constant GL_UNSIGNED_BYTE is accepted. The initial value is GL_UNSIGNED_BYTE .
stride
Specifies the byte offset between consecutive matrix indices. If stride is 0, the matrix indices are understood to be tightly packed in the array. The initial value is 0 .
pointer
Specifies a pointer to the first matrix index of the first vertex in the array. The initial value is 0 .

Description

glMatrixIndexPointer specifies the location and data of an array of matrix indices to use when rendering. size specifies the number of matrix indices per vertex and type the data type of the coordinates. stride specifies the byte stride from one matrix index 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 matrices indices are used to blend corresponding matrices for a given vertex.
When a matrix index array is specified, size , type , stride , and pointer are saved as client-side state.
If the matrix index array is enabled, it is used when glDrawArrays , or glDrawElements is called. To enable and disable the matrix index array, call glEnableClientState and glDisableClientState with the argument GL_MATRIX_INDEX_ARRAY_OES . The matrix index 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

glMatrixIndexPointer 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 , glMatrixMode , glWeightPointer ,

Copyright Notices

This documentation is based on documentation licensed under the SGI Free Software License B.