glBufferStorage(3G)
NAME
glBufferStorage, glNamedBufferStorage - creates and initializes a buffer object's immutable data store
C SPECIFICATION
void glBufferStorage(GLenum target, GLsizeiptr size,
const GLvoid * data, GLbitfield flags);
void glNamedBufferStorage(GLuint buffer, GLsizei size,
const void *data, GLbitfield flags);
PARAMETERS
target
Specifies the target to which the buffer object is bound for
glBufferStorage, 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 glNamedBufferStorage
function.
size
Specifies the size in bytes of the buffer object's new data store.
data
Specifies a pointer to data that will be copied into the data store
for initialization, or NULL if no data is to be copied.
flags
Specifies the intended usage of the buffer's data store. Must be a
bitwise combination of the following flags.
GL_DYNAMIC_STORAGE_BIT, GL_MAP_READ_BITGL_MAP_WRITE_BIT,
GL_MAP_PERSISTENT_BIT, GL_MAP_COHERENT_BIT, and
GL_CLIENT_STORAGE_BIT.
DESCRIPTION
glBufferStorage and glNamedBufferStorage create a new immutable data
store. For glBufferStorage, the buffer object currently bound to target
will be initialized. For glNamedBufferStorage, buffer is the name of
the buffer object that will be configured. The size of the data store
is specified by size. If an initial data is available, its address may
be supplied in data. Otherwise, to create an uninitialized data store,
data should be NULL.
The flags parameters specifies the intended usage of the buffer's data
store. It must be a bitwise combination of a subset of the following
flags:
GL_DYNAMIC_STORAGE_BIT
The contents of the data store may be updated after creation
through calls to glBufferSubData(). If this bit is not set, the
buffer content may not be directly updated by the client. The data
argument may be used to specify the initial content of the buffer's
data store regardless of the presence of the
GL_DYNAMIC_STORAGE_BIT. Regardless of the presence of this bit,
buffers may always be updated with server-side calls such as
glCopyBufferSubData() and glClearBufferSubData().
GL_MAP_READ_BIT
The data store may be mapped by the client for read access and a
pointer in the client's address space obtained that may be read
from.
GL_MAP_WRITE_BIT
The data store may be mapped by the client for write access and a
pointer in the client's address space obtained that may be written
through.
GL_MAP_PERSISTENT_BIT
The client may request that the server read from or write to the
buffer while it is mapped. The client's pointer to the data store
remains valid so long as the data store is mapped, even during
execution of drawing or dispatch commands.
GL_MAP_COHERENT_BIT
Shared access to buffers that are simultaneously mapped for client
access and are used by the server will be coherent, so long as that
mapping is performed using glMapBufferRange(). That is, data
written to the store by either the client or server will be
immediately visible to the other with no further action taken by
the application. In particular,
* If GL_MAP_COHERENT_BIT is not set and the client performs a
write followed by a call to the glMemoryBarrier() command with
the GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT set, then in subsequent
commands the server will see the writes.
* If GL_MAP_COHERENT_BIT is set and the client performs a write,
then in subsequent commands the server will see the writes.
* If GL_MAP_COHERENT_BIT is not set and the server performs a
write, the application must call glMemoryBarrier() with the
GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT set and then call
glFenceSync() with GL_SYNC_GPU_COMMANDS_COMPLETE (or glFinish).
Then the CPU will see the writes after the sync is complete.
* If GL_MAP_COHERENT_BIT is set and the server does a write, the
app must call FenceSync with GL_SYNC_GPU_COMMANDS_COMPLETE (or
glFinish()). Then the CPU will see the writes after the sync is
complete.
GL_CLIENT_STORAGE_BIT
When all other criteria for the buffer storage allocation are met,
this bit may be used by an implementation to determine whether to
use storage that is local to the server or to the client to serve
as the backing store for the buffer.
The allowed combinations of flags are subject to certain restrictions.
They are as follows:
* If flags contains GL_MAP_PERSISTENT_BIT, it must also contain at
least one of GL_MAP_READ_BIT or GL_MAP_WRITE_BIT.
* If flags contains GL_MAP_COHERENT_BIT, it must also contain
GL_MAP_PERSISTENT_BIT.
NOTES
glBufferStorage is available only if the GL version is 4.4 or greater. glNamedBufferStorage is available only if the GL version is 4.5 or greater. If data is NULL, a data store of the specified size is still created, but its contents remain uninitialized and thus undefined.
ERRORS
GL_INVALID_ENUM is generated by glBufferStorage if target is not one of the accepted buffer targets. GL_INVALID_OPERATION is generated by glNamedBufferStorage if buffer is not the name of an existing buffer object. GL_INVALID_VALUE is generated if size is less than or equal to zero. GL_INVALID_OPERATION is generated by glBufferStorage if the reserved buffer object name 0 is bound to target. GL_OUT_OF_MEMORY is generated if the GL is unable to create a data store with the properties requested in flags. GL_INVALID_VALUE is generated if flags has any bits set other than those defined above. GL_INVALID_VALUE error is generated if flags contains GL_MAP_PERSISTENT_BIT but does not contain at least one of GL_MAP_READ_BIT or GL_MAP_WRITE_BIT. GL_INVALID_VALUE is generated if flags contains GL_MAP_COHERENT_BIT, but does not also contain GL_MAP_PERSISTENT_BIT. GL_INVALID_OPERATION is generated by glBufferStorage if the GL_BUFFER_IMMUTABLE_STORAGE flag of the buffer bound to target is GL_TRUE.
ASSOCIATED GETS
glGetBufferSubData() glGetBufferParameter() with argument GL_BUFFER_SIZE or GL_BUFFER_USAGE
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
glBufferStorage - - - - - - - - - -
glNamedBufferStorage - - - - - - - - - - -
SEE ALSO
glBindBuffer(), glBufferSubData(), glMapBuffer(), glUnmapBuffer()
COPYRIGHT
Copyright 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 2014 Khronos Group [FIXME: source] 07/22/2015 GLBUFFERSTORAGE(3G)
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