GLGETBUFFERSUBDATA(3G)          [FIXME: manual]         GLGETBUFFERSUBDATA(3G)

NAME
       glGetBufferSubData, glGetNamedBufferSubData - returns a subset of a
       buffer object's data store

C SPECIFICATION
       void glGetBufferSubData(GLenum target, GLintptr offset,
                               GLsizeiptr size, GLvoid * data);

       void glGetNamedBufferSubData(GLuint buffer, GLintptr offset,
                                    GLsizeiptr size, void *data);

PARAMETERS
       target
           Specifies the target to which the buffer object is bound for
           glGetBufferSubData, 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
           glGetNamedBufferSubData.

       offset
           Specifies the offset into the buffer object's data store from which
           data will be returned, measured in bytes.

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

       data
           Specifies a pointer to the location where buffer object data is
           returned.

DESCRIPTION
       glGetBufferSubData and glGetNamedBufferSubData return some or all of
       the data contents of the data store of the specified buffer object.
       Data starting at byte offset offset and extending for size bytes is
       copied from the buffer object's data store to the memory pointed to by
       data. An error is thrown if the buffer object is currently mapped, or
       if offset and size together define a range beyond the bounds of the
       buffer object's data store.

NOTES
       If an error is generated, no change is made to the contents of data.

       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 by glGetBufferSubData if target is not one
       of the generic buffer binding targets.

       GL_INVALID_OPERATION is generated by glGetBufferSubData if zero is
       bound to target.

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

       GL_INVALID_VALUE is generated if offset or size is negative, or if
       $offset + size$ is greater than the value of GL_BUFFER_SIZE for the
       buffer object.

       GL_INVALID_OPERATION is generated if the buffer object is mapped with
       glMapBufferRange() or glMapBuffer(), unless it was mapped with the
       GL_MAP_PERSISTENT_BIT bit set in the glMapBufferRange access flags.

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 |
       +------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetBufferSubData      | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> |
       +------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetNamedBufferSubData |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  | <?> |
       +------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

SEE ALSO
       glBindBuffer(), glBufferData(), glBufferSubData(), glMapBuffer(),
       glUnmapBuffer()

COPYRIGHT
       Copyright (C) 2005 Addison-Wesley. Copyright (C) 2011-2014 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/.

COPYRIGHT
       Copyright (C) 2005 Sams Publishing
       Copyright (C) 2011-2014 Khronos Group

[FIXME: source]                   05/21/2022            GLGETBUFFERSUBDATA(3G)