|Buffer Binding Target||
Atomic counter storage
Buffer copy source
Buffer copy destination
Indirect compute dispatch commands
Indirect command arguments
Vertex array indices
Pixel read target
Texture data source
Query result buffer
Read-write storage for shaders
Texture data buffer
Transform feedback buffer
Uniform block storage
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 nature of access may be one of these:
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 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.
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.
|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||
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. m[blue]http://opencontent.org/openpub/m.