GLBUFFERDATA(3G)						    OpenGL 3.3							  GLBUFFERDATA(3G)

NAME

       glBufferData - creates and initializes a buffer object's data store

C SPECIFICATION

       void glBufferData(GLenum target, GLsizeiptr size, const GLvoid * data, GLenum usage);

PARAMETERS

       target
	   Specifies the target buffer object. The symbolic constant must be GL_ARRAY_BUFFER, GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER,
	   GL_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER, GL_TEXTURE_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER, or
	   GL_UNIFORM_BUFFER.

       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.

DESCRIPTION

       glBufferData creates a new data store for the buffer object currently bound to target. 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:

       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.

NOTES

       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 consistent 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.

ERRORS

       GL_INVALID_ENUM is generated 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 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 specified size.

ASSOCIATED GETS

       glGetBufferSubData()

       glGetBufferParameter() with argument GL_BUFFER_SIZE or GL_BUFFER_USAGE

SEE ALSO

       glBindBuffer(), glBufferSubData(), glMapBuffer(), glUnmapBuffer()

COPYRIGHT

       Copyright (C) 2005 Addison-Wesley. 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/.

OpenGL 3.3							    03/08/2011							  GLBUFFERDATA(3G)