glBufferSubData man page on RedHat
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GLBUFFERSUBDATA(3G) OpenGL Manual GLBUFFERSUBDATA(3G)
NAME
glBufferSubData - updates a subset of a buffer object's data store
C SPECIFICATION
void glBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size,
const GLvoid * data);
PARAMETERS
target
Specifies the target buffer object. The symbolic constant must be
GL_ARRAY_BUFFER, GL_ATOMIC_COUNTER_BUFFER, GL_COPY_READ_BUFFER,
GL_COPY_WRITE_BUFFER, GL_DRAW_INDIRECT_BUFFER,
GL_DISPATCH_INDIRECT_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER,
GL_SHADER_STORAGE_BUFFER, GL_TEXTURE_BUFFER,
GL_TRANSFORM_FEEDBACK_BUFFER, or GL_UNIFORM_BUFFER.
offset
Specifies the offset into the buffer object's data store where data
replacement will begin, measured in bytes.
size
Specifies the size in bytes of the data store region being
replaced.
data
Specifies a pointer to the new data that will be copied into the
data store.
DESCRIPTION
glBufferSubData redefines some or all of the data store for the buffer
object currently bound to target. Data starting at byte offset offset
and extending for size bytes is copied to the data store from the
memory pointed to by data. An error is thrown if offset and size
together define a range beyond the bounds of the buffer object's data
store.
NOTES
When replacing the entire data store, consider using glBufferSubData
rather than completely recreating the data store with glBufferData.
This avoids the cost of reallocating the data store.
Consider using multiple buffer objects to avoid stalling the rendering
pipeline during data store updates. If any rendering in the pipeline
makes reference to data in the buffer object being updated by
glBufferSubData, especially from the specific region being updated,
that rendering must drain from the pipeline before the data store can
be updated.
Clients must align data elements consistent with the requirements of
the client platform, with an additional base-level requirement that an
offset within a buffer to a datum comprising N bytes be a multiple of
N.
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.
ERRORS
GL_INVALID_ENUM is generated if target is not one of the accepted
buffer targets.
GL_INVALID_VALUE is generated if offset or size is negative, or if
together they define a region of memory that extends beyond the buffer
object's allocated data store.
GL_INVALID_OPERATION is generated if the reserved buffer object name 0
is bound to target.
GL_INVALID_OPERATION is generated if the buffer object being updated is
mapped.
ASSOCIATED GETS
glGetBufferSubData()
SEE ALSO
glBindBuffer(), glBufferData(), glMapBuffer(), glUnmapBuffer()
COPYRIGHT
Copyright © 2005 Addison-Wesley. 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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLBUFFERSUBDATA(3G)
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