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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, GLsizei 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 │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│ / │ │ │ │ │ │ │ │ │ │ │ │ │
│ Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│ Name │ │ │ │ │ │ │ │ │ │ │ │ │
├─────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│ glGetBufferSubData │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├─────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│ glGetNamedBufferSubData │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
└─────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glBindBuffer(), glBufferData(), glBufferSubData(), glMapBuffer(), glUnmapBuffer()
COPYRIGHT
Copyright © 2005 Addison-Wesley. Copyright © 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 © 2005 Sams Publishing
Copyright © 2011-2014 Khronos Group
[FIXME: source] 01/03/2018 GLGETBUFFERSUBDATA(3G)