2012 Khronos Group
glClearBufferSubData 3G
glClearBufferSubData fill all or part of buffer object's data store with a fixed value

## C Specification

void `glClearBufferSubData` GLenum target GLenum internalformat GLintptr offset GLsizeiptr size GLenum format GLenum type const void * data

## Parameters

target

  Specify the target of the operation. target must be one of the global buffer binding targets.

internalformat

  The internal format with which the data will be stored in the buffer object.

offset

  The offset, in basic machine units into the buffer object's data store at which to start filling.

size

  The size, in basic machine units of the range of the data store to fill.

format

  The format of the data in memory addressed by data.

type

  The type of the data in memory addressed by data.

data

  The address of a memory location storing the data to be replicated into the buffer's data store.

## Description

`glClearBufferSubData` fills a specified region of a buffer object's data store with data from client memory. offset and size demark the extent of the region within the data store of the buffer object bound to target to fill with data. Data, initially supplied in a format specified by format in data type type is read from the memory address given by data and converted into the internal representation given by internalforamt. This converted data is then replicated throughout the specified region of the buffer object's data store.

If data is NULL, then the subrange of the buffer's data store is filled with zeros.

## Errors

`GL_INVALID_ENUM` is generated if target not one of the generic buffer binding targets.

`GL_INVALID_VALUE` is generated if no buffer is bound to target.

`GL_INVALID_ENUM` is generated if internalformat is not a sized internal format.

`GL_INVALID_VALUE` is generated if offset or range are not multiples of the number of basic machine units per-element for the internal format specified by internalformat.

`GL_INVALID_VALUE` is generated if offset or size is less than zero, or if offset + size is greater than the value of `GL_BUFFER_SIZE` for the buffer bound to target.

`GL_INVALID_OPERATION` is generated if any part of the specified buffer range is mapped with glMapBufferRange or glMapBuffer.

## See Also

glClearBufferData.

## Copyright

Copyright 2012 Khronos Group. 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/.