glCopyBufferSubData, glCopyNamedBufferSubData — copy all or part of the data store of a buffer object to the data store of another buffer object
void glCopyBufferSubData(
|
GLenum readTarget, |
GLenum writeTarget, | |
GLintptr readOffset, | |
GLintptr writeOffset, | |
GLsizeiptr size) ; |
void glCopyNamedBufferSubData(
|
GLuint readBuffer, |
GLuint writeBuffer, | |
GLintptr readOffset, | |
GLintptr writeOffset, | |
GLsizeiptr size) ; |
readTarget
Specifies the target to which the source buffer object
is bound for glCopyBufferSubData
writeTarget
Specifies the target to which the destination buffer
object is bound for
glCopyBufferSubData
.
readBuffer
Specifies the name of the source buffer object for
glCopyNamedBufferSubData
.
writeBuffer
Specifies the name of the destination buffer object for
glCopyNamedBufferSubData
.
readOffset
Specifies the offset, in basic machine units, within the data store of the source buffer object at which data will be read.
writeOffset
Specifies the offset, in basic machine units, within the data store of the destination buffer object at which data will be written.
size
Specifies the size, in basic machine units, of the data to be copied from the source buffer object to the destination buffer object.
glCopyBufferSubData
and
glCopyNamedBufferSubData
copy part of the
data store attached to a source buffer object to the data store
attached to a destination buffer object. The number of basic
machine units indicated by size
is copied
from the source at offset readOffset
to
the destination at writeOffset
.
readOffset
,
writeOffset
and
size
are in terms of basic machine units.
For glCopyBufferSubData
,
readTarget
and
writeTarget
specify the targets to which
the source and destination buffer objects are bound, and must
each 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 |
Any of these targets may be used, but the targets
GL_COPY_READ_BUFFER
and
GL_COPY_WRITE_BUFFER
are provided
specifically to allow copies between buffers without disturbing
other GL state.
readOffset
,
writeOffset
and
size
must all be greater than or equal to
zero. Furthermore, $readOffset+size$ must not exceeed the size
of the source buffer object, and $writeOffset+size$ must not
exceeed the size of the buffer bound to
writeTarget
. If the source and
destination are the same buffer object, then the source and
destination ranges must not overlap.
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.
GL_INVALID_ENUM
is generated by
glCopyBufferSubData
if
readTarget
or
writeTarget
is not one of the buffer
binding targets listed above.
GL_INVALID_OPERATION
is generated by
glCopyBufferSubData
if zero is bound to
readTarget
or
writeTarget
.
GL_INVALID_OPERATION
is generated by
glCopyNamedBufferSubData
if
readBuffer
or
writeBuffer
is not the name of an
existing buffer object.
GL_INVALID_VALUE
is generated if any of
readOffset
,
writeOffset
or
size
is negative, if $readOffset + size$
is greater than the size of the source buffer object (its value
of GL_BUFFER_SIZE
), or if $writeOffset +
size$ is greater than the size of the destination buffer object.
GL_INVALID_VALUE
is generated if the source
and destination are the same buffer object, and the ranges
$[readOffset,readOffset+size)$ and
$[writeOffset,writeOffset+size)$ overlap.
GL_INVALID_OPERATION
is generated if either
the source or destination buffer object is mapped with
glMapBufferRange
or
glMapBuffer,
unless they were mapped with the
GL_MAP_PERSISTENT
bit set in the
glMapBufferRange
access
flags.
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 |
glCopyBufferSubData
|
- | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
glCopyNamedBufferSubData
|
- | - | - | - | - | - | - | - | - | - | - | ✔ |
glGenBuffers, glBindBuffer, glBufferData, glBufferSubData, glGetBufferSubData, glMapBuffer, glMapBufferRange
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. https://opencontent.org/openpub/.