glBufferSubData — updates a subset of a buffer object's data store
|const GLvoid *||data|
Specifies the target buffer object.
The symbolic constant must be
Specifies the offset into the buffer object's data store where data replacement will begin, measured in bytes.
Specifies the size in bytes of the data store region being replaced.
Specifies a pointer to the new data that will be copied into the data store.
glBufferSubData redefines some or all of the data store for the buffer object currently
target. Data starting at byte offset
size bytes is copied to the data store from the memory pointed to by
data. An error is thrown if
together define a range beyond the bounds of the buffer object's data store.
glBufferSubData 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.
When replacing the entire data store, consider using
than completely recreating the data store with
glBufferData. This avoids the cost of
reallocating the data store.
Consider using multiple buffer objects to avoid stalling the rendering pipeline during data store updates.
If any rendering in the pipeline makes reference to data in the buffer object being updated by
glBufferSubData, especially from the specific region being updated, that rendering must
drain from the pipeline before the data store can be updated.
Clients must align data elements consistent with the requirements of the client platform, with an additional base-level requirement that an offset within a buffer to a datum comprising .
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 updated 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/.