2005 Sams Publishing
glGetBufferPointerv 3G
glGetBufferPointerv return the pointer to a mapped buffer object's data store

## C Specification

void `glGetBufferPointerv` GLenum target GLenum pname GLvoid ** params

## Parameters

target

  Specifies the target buffer object. The symbolic constant must be `GL_ARRAY_BUFFER`, `GL_COPY_READ_BUFFER`, `GL_COPY_WRITE_BUFFER`, `GL_ELEMENT_ARRAY_BUFFER`, `GL_PIXEL_PACK_BUFFER`, `GL_PIXEL_UNPACK_BUFFER`, `GL_TEXTURE_BUFFER`, `GL_TRANSFORM_FEEDBACK_BUFFER`, or `GL_UNIFORM_BUFFER`.

pname

  Specifies the pointer to be returned. The symbolic constant must be `GL_BUFFER_MAP_POINTER`.

params

  Returns the pointer value specified by pname.

## Description

`glGetBufferPointerv` returns pointer information. pname is a symbolic constant indicating the pointer to be returned, which must be `GL_BUFFER_MAP_POINTER`, the pointer to which the buffer object's data store is mapped. If the data store is not currently mapped, `NULL` is returned. params is a pointer to a location in which to place the returned pointer value.

## Notes

If an error is generated, no change is made to the contents of params.

The initial value for the pointer is `NULL`.

## Errors

`GL_INVALID_ENUM` is generated if target or pname is not an accepted value.

`GL_INVALID_OPERATION` is generated if the reserved buffer object name 0 is bound to target.

## See Also

glBindBuffer, glMapBuffer

## Copyright

Copyright 2005 Addison-Wesley. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.