glBufferData, glNamedBufferData — バッファーオブジェクトのデータストアを作成して初期化します
void glBufferData(
|
GLenum target, |
GLsizeiptr size, | |
const void * data, | |
GLenum usage) ; |
void glNamedBufferData(
|
GLuint buffer, |
GLsizeiptr size, | |
const void *data, | |
GLenum usage) ; |
target
バッファーオブジェクトが glBufferData
にバインドされる対象を指定します。
これは、下記の表のバッファーバインド対象の1つである必要があります。
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
glNamedBufferData
関数のバッファーオブジェクトの名前を指定します。
size
バッファーオブジェクトの新しいデータストアのサイズをバイト単位で指定します。
data
初期化のためにデータストアにコピーされるデータへのポインターを指定します。
データがコピーされない場合は NULL
を指定します。
usage
データストアの予想される使用パターンを指定します。
シンボリック定数は、
GL_STREAM_DRAW
、または
GL_STREAM_READ
、
GL_STREAM_COPY
、
GL_STATIC_DRAW
、
GL_STATIC_READ
、
GL_STATIC_COPY
、
GL_DYNAMIC_DRAW
、
GL_DYNAMIC_READ
、
GL_DYNAMIC_COPY
である必要があります。
glBufferData
と
glNamedBufferData
は、バッファーオブジェクトの新しいデータストアを作成します。
glBufferData
の場合、現在target
にバインドされているバッファーオブジェクトが使用されます。
glNamedBufferData
の場合、代わりに、呼び出し元が buffer
で指定したIDに関連付けられたバッファーオブジェクトが使用されます。
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/.