glBufferData, glNamedBufferData — creates and initializes a buffer object's data store
void glBufferData(
|
GLenum target, |
| GLsizeiptr size, | |
| const GLvoid * data, | |
GLenum usage); |
void glNamedBufferData(
|
GLuint buffer, |
| GLsizeiptr size, | |
| const void *data, | |
GLenum usage); |
target
Specifies the target to which the buffer object is bound for
glBufferData, 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
glNamedBufferData 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.
usage
Specifies the expected usage pattern of the data store. The
symbolic constant must be GL_STREAM_DRAW,
GL_STREAM_READ,
GL_STREAM_COPY,
GL_STATIC_DRAW,
GL_STATIC_READ,
GL_STATIC_COPY,
GL_DYNAMIC_DRAW,
GL_DYNAMIC_READ, or
GL_DYNAMIC_COPY.
glBufferData and
glNamedBufferData create a new data store for a
buffer object. In case of glBufferData, the buffer
object currently bound to target is used. For
glNamedBufferData, a buffer object associated with ID
specified by the caller in buffer will be used
instead.
While creating the new storage, any pre-existing data store is
deleted. The new data store is created with the specified
size in bytes and usage. If
data is not NULL, the data
store is initialized with data from this pointer. In its initial state,
the new data store is not mapped, it has a NULL
mapped pointer, and its mapped access is
GL_READ_WRITE.
usage is a hint to the GL implementation as
to how a buffer object's data store will be accessed. This enables the GL
implementation to make more intelligent decisions that may significantly
impact buffer object performance. It does not, however, constrain the
actual usage of the data store. usage can be broken
down into two parts: first, the frequency of access (modification and
usage), and second, the nature of that access. The frequency of access may
be one of these:
The data store contents will be modified once and used at most a few times.
The data store contents will be modified once and used many times.
The data store contents will be modified repeatedly and used many times.
The nature of access may be one of these:
The data store contents are modified by the application, and used as the source for GL drawing and image specification commands.
The data store contents are modified by reading data from the GL, and used to return that data when queried by the application.
The data store contents are modified by reading data from the GL, and used as the source for GL drawing and image specification commands.
If data is NULL, a data store of the specified size is still created,
but its contents remain uninitialized and thus undefined.
Clients must align data elements consistently with the requirements of the client
platform, with an additional base-level requirement that an offset within a buffer to
a datum comprising
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.
GL_INVALID_ENUM is generated by
glBufferData if target is not
one of the accepted buffer targets.
GL_INVALID_ENUM is generated if
usage is not GL_STREAM_DRAW,
GL_STREAM_READ, GL_STREAM_COPY,
GL_STATIC_DRAW, GL_STATIC_READ,
GL_STATIC_COPY, GL_DYNAMIC_DRAW,
GL_DYNAMIC_READ, or
GL_DYNAMIC_COPY.
GL_INVALID_VALUE is generated if
size is negative.
GL_INVALID_OPERATION is generated by
glBufferData if the reserved buffer object name 0 is
bound to target.
GL_INVALID_OPERATION is generated by
glNamedBufferData if buffer is not the name of an
existing buffer object.
GL_INVALID_OPERATION is generated if the
GL_BUFFER_IMMUTABLE_STORAGE flag of the buffer
object is GL_TRUE.
GL_OUT_OF_MEMORY is generated if the GL is
unable to create a data store with the specified
size.
glGetBufferParameter
with argument GL_BUFFER_SIZE or GL_BUFFER_USAGE
| 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 |
glBufferData
|
✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
glNamedBufferData
|
- | - | - | - | - | - | - | - | - | - | - | ✔ |
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/.