NAME

       glBufferSubData - updates a subset of a buffer object's data store

C SPECIFICATION

       void glBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size,
                            const GLvoid * data);

PARAMETERS

       target
           Specifies the target buffer object. The symbolic constant must be GL_ARRAY_BUFFER,
           GL_ATOMIC_COUNTER_BUFFER, GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER,
           GL_DRAW_INDIRECT_BUFFER, GL_DISPATCH_INDIRECT_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
           GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER, GL_QUERY_BUFFER,
           GL_SHADER_STORAGE_BUFFER, GL_TEXTURE_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER, or
           GL_UNIFORM_BUFFER.

       offset
           Specifies the offset into the buffer object's data store where data replacement will
           begin, measured in bytes.

       size
           Specifies the size in bytes of the data store region being replaced.

       data
           Specifies a pointer to the new data that will be copied into the data store.

DESCRIPTION

       glBufferSubData redefines some or all of the data store for the buffer object currently
       bound to target. Data starting at byte offset offset and extending for size bytes is
       copied to the data store from the memory pointed to by data. An error is thrown if offset
       and size together define a range beyond the bounds of the buffer object's data store.

NOTES

       When replacing the entire data store, consider using glBufferSubData rather 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 N bytes be a multiple of N.

       The GL_ATOMIC_COUNTER_BUFFER target is available only if the GL version is 4.2 or greater.

       The GL_DISPATCH_INDIRECT_BUFFER and GL_SHADER_STORAGE_BUFFER targets are available only if
       the GL version is 4.3 or greater.

       The GL_QUERY_BUFFER target is available only if the GL version is 4.4 or greater.

ERRORS

       GL_INVALID_ENUM is generated if target is not one of the accepted buffer targets.

       GL_INVALID_VALUE is generated if offset or 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 target.

       GL_INVALID_OPERATION is generated if the buffer object being updated is mapped.

ASSOCIATED GETS

       glGetBufferSubData()

SEE ALSO

       glBindBuffer(), glBufferData(), glMapBuffer(), glUnmapBuffer()

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/.

AUTHORS

       opengl.org