Creates and initializes a buffer object's data
||-||Specifies the target to which the buffer object is bound for |
||-||Specifies the name of the buffer object for |
||-||Specifies the size in bytes of the buffer object's new data store.|
||-||Specifies a pointer to data that will be copied into the data store for initialization, or |
||-||Specifies the expected usage pattern of the data store. The symbolic constant must be |
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
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:
|STREAM||-||The data store contents will be modified once and used at most a few times.|
|STATIC||-||The data store contents will be modified once and used many times.|
|DYNAMIC||-||The data store contents will be modified repeatedly and used many times.|
The nature of access may be one of these:
|DRAW||-||The data store contents are modified by the application, and used as the source for GL drawing and image specification commands.|
|READ||-||The data store contents are modified by reading data from the GL, and used to return that data when queried by the application.|
|COPY||-||The data store contents are modified by reading data from the GL, and used as the source for GL drawing and image specification commands.|
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 [math][/math] bytes be a multiple of [math][/math] .
GL_ATOMIC_COUNTER_BUFFER target is available only if the GL version is 4.2 or greater.
GL_SHADER_STORAGE_BUFFER targets are available only if the GL version is 4.3 or greater.
GL_QUERY_BUFFER target is available only if the GL version is 4.4 or greater.
GL_INVALID_ENUM is generated by
target is not one of the accepted buffer targets.
GL_INVALID_ENUM is generated if
usage is not
GL_DYNAMIC_READ , or
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
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_OUT_OF_MEMORY is generated if the GL is unable to create a data store with the specified
glGetBufferParameter with argument
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/.