glGetBufferSubData — returns a subset of a buffer object's data store
Specifies the target buffer object.
The symbolic constant must be
Specifies the offset into the buffer object's data store from which data will be returned, measured in bytes.
Specifies the size in bytes of the data store region being returned.
Specifies a pointer to the location where buffer object data is returned.
glGetBufferSubData returns some or all of the data from the buffer object currently
target. Data starting at byte offset
size bytes is copied from the data store to the memory pointed to by
data. An error is thrown if the buffer object is currently mapped, or if
size together define a range beyond the bounds
of the buffer object's data store.
If an error is generated,
no change is made to the contents of
glGetBufferSubData is available only if the GL version is 1.5 or greater.
GL_PIXEL_UNPACK_BUFFER are available
only if the GL version is 2.1 or greater.
GL_INVALID_ENUM is generated if
target is not
GL_INVALID_VALUE is generated if
size is negative, or if together they define a region of memory
that extends beyond the buffer object's allocated data store.
GL_INVALID_OPERATION is generated if the reserved buffer object name 0 is bound to
GL_INVALID_OPERATION is generated if the buffer object being queried is mapped.
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/.