glFlushMappedBufferRange - OpenGL 4 Reference Pages

## Name

glFlushMappedBufferRange, glFlushMappedNamedBufferRange — indicate modifications to a range of a mapped buffer

## C Specification

`void glFlushMappedBufferRange(` | GLenum target,
| GLintptr offset,
| GLsizeiptr length`)`;

`void glFlushMappedNamedBufferRange(` | GLuint buffer,
| GLintptr offset,
| GLsizeiptr length`)`;

## Parameters

`target`

  Specifies the target to which the buffer object is bound for `glFlushMappedBufferRange`, which must be one of the buffer binding targets in the following table:

  Buffer Binding Target | Purpose
  --- | ---
  `GL_ARRAY_BUFFER` | Vertex attributes
  `GL_ATOMIC_COUNTER_BUFFER` | Atomic counter storage
  `GL_COPY_READ_BUFFER` | Buffer copy source
  `GL_COPY_WRITE_BUFFER` | Buffer copy destination
  `GL_DISPATCH_INDIRECT_BUFFER` | Indirect compute dispatch commands
  `GL_DRAW_INDIRECT_BUFFER` | Indirect command arguments
  `GL_ELEMENT_ARRAY_BUFFER` | Vertex array indices
  `GL_PIXEL_PACK_BUFFER` | Pixel read target
  `GL_PIXEL_UNPACK_BUFFER` | Texture data source
  `GL_QUERY_BUFFER` | Query result buffer
  `GL_SHADER_STORAGE_BUFFER` | Read-write storage for shaders
  `GL_TEXTURE_BUFFER` | Texture data buffer
  `GL_TRANSFORM_FEEDBACK_BUFFER` | Transform feedback buffer
  `GL_UNIFORM_BUFFER` | Uniform block storage

`buffer`

  Specifies the name of the buffer object for `glFlushMappedNamedBufferRange`.

`offset`

  Specifies the start of the buffer subrange, in basic machine units.

`length`

  Specifies the length of the buffer subrange, in basic machine units.

## Description

`glFlushMappedBufferRange` indicates that modifications have been made to a range of a mapped buffer object. The buffer object must previously have been mapped with the `GL_MAP_FLUSH_EXPLICIT_BIT` flag.

`offset` and `length` indicate the modified subrange of the mapping, in basic machine units. The specified subrange to flush is relative to the start of the currently mapped range of the buffer. These commands may be called multiple times to indicate distinct subranges of the mapping which require flushing.

If a buffer range is mapped with both `GL_MAP_PERSISTENT_BIT` and `GL_MAP_FLUSH_EXPLICIT_BIT` set, then these commands may be called to ensure that data written by the client into the flushed region becomes visible to the server. Data written to a coherent store will always become visible to the server after an unspecified period of time.

## Notes

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 by `glFlushMappedBufferRange` if `target` is not one of the buffer binding targets listed above.

`GL_INVALID_OPERATION` is generated by `glFlushMappedBufferRange` if zero is bound to `target`.

`GL_INVALID_OPERATION` is generated by `glFlushMappedNamedBufferRange` if `buffer` is not the name of an existing buffer object.

`GL_INVALID_VALUE` is generated if `offset` or `length` is negative, or if `offset` + `length` exceeds the size of the mapping.

`GL_INVALID_OPERATION` is generated if the buffer object is not mapped, or is mapped without the `GL_MAP_FLUSH_EXPLICIT_BIT` flag.

## Version Support

| OpenGL Version
--- | ---
Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5
`glFlushMappedBufferRange` | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
`glFlushMappedNamedBufferRange` | - | - | - | - | - | - | - | - | - | - | - | ✔

## See Also

glMapBufferRange, glMapBuffer, glUnmapBuffer

## Copyright

Copyright © 2010-2014 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/.