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NAME
glUnmapBuffer, glUnmapNamedBuffer - release the mapping of a buffer object's data store into the client's
address space
C SPECIFICATION
GLboolean glUnmapBuffer(GLenum target);
GLboolean glUnmapNamedBuffer(GLuint buffer);
PARAMETERS
target
Specifies the target to which the buffer object is bound for glUnmapBuffer, 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 glUnmapNamedBuffer.
DESCRIPTION
glUnmapBuffer and glUnmapNamedBuffer unmap (release) any mapping of a specified buffer object into the
client's address space (see glMapBufferRange() and glMapBuffer()).
If a mapping is not unmapped before the corresponding buffer object's data store is used by the GL, an
error will be generated by any GL command that attempts to dereference the buffer object's data store,
unless the buffer was successfully mapped with GL_MAP_PERSISTENT_BIT (see glMapBufferRange()). When a
data store is unmapped, the mapped pointer becomes invalid.
glUnmapBuffer returns GL_TRUE unless the data store contents have become corrupt during the time the data
store was mapped. This can occur for system-specific reasons that affect the availability of graphics
memory, such as screen mode changes. In such situations, GL_FALSE is returned and the data store contents
are undefined. An application must detect this rare condition and reinitialize the data store.
A buffer object's mapped data store is automatically unmapped when the buffer object is deleted or its
data store is recreated with glBufferData()).
NOTES
If an error is generated, glUnmapBuffer returns GL_FALSE.
The GL_ATOMIC_COUNTER_BUFFER target is accepted 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 glUnmapBuffer if target is not one of the buffer binding targets listed
above.
GL_INVALID_OPERATION is generated by glUnmapBuffer if zero is bound to target.
GL_INVALID_OPERATION is generated by glUnmapNamedBuffer if buffer is not the name of an existing buffer
object.
GL_INVALID_OPERATION is generated if the buffer object is not in a mapped state.
ASSOCIATED GETS
glGetBufferParameter() with argument GL_BUFFER_MAPPED.
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 │ │ │ │ │ │ │ │ │ │ │ │ │
├───────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glUnmapBuffer │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├───────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glUnmapNamedBuffer │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
└───────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glBufferData(), glDeleteBuffers(), glMapBuffer(), glMapBufferRange()
COPYRIGHT
Copyright © 2005 Addison-Wesley. 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/.
COPYRIGHT
Copyright © 2005 Addison-Wesley Group
Copyright © 2010-2014 Khronos Group
[FIXME: source] 01/03/2018 GLUNMAPBUFFER(3G)