glBindBuffer — bind a named buffer object
void glBindBuffer( | GLenum target, |
GLuint buffer); |
target
Specifies the target to which the buffer object is bound.
The symbolic constant must be
GL_ARRAY_BUFFER or
GL_ELEMENT_ARRAY_BUFFER.
bufferSpecifies the name of a buffer object.
glBindBuffer lets you create or use a named buffer object. Calling glBindBuffer with
target set to
GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER
and buffer set to the name
of the new buffer object binds the buffer object name to the target.
When a buffer object is bound to a target, the previous binding for that
target is automatically broken.
Buffer object names are unsigned integers. The value zero is reserved, but
there is no default buffer object for each buffer object target. Instead, buffer set to zero
effectively unbinds any buffer object previously bound, and restores client memory usage for that buffer object target.
Buffer object names and the corresponding buffer object contents are local to
the shared object space of the current GL rendering context.
You may use glGenBuffers to generate a set of new buffer object names.
The state of a buffer object immediately after it is first bound is a zero-sized memory buffer with
GL_STATIC_DRAW usage.
While a non-zero buffer object name is bound, GL operations on the target to which it is
bound affect the bound buffer object, and queries of the target to which it is bound return state
from the bound buffer object. While buffer object name zero is bound, as in the initial state,
attempts to modify or query state on the target to which it is bound generates an
GL_INVALID_OPERATION error.
When vertex array pointer state is changed by a call to
glVertexAttribPointer,
the current buffer object binding (GL_ARRAY_BUFFER_BINDING) is copied into the
corresponding client state for the vertex attrib array being changed, one of the indexed
GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDINGs. While a non-zero buffer object is bound to the
GL_ARRAY_BUFFER target, the vertex array pointer parameter that is traditionally
interpreted as a pointer to client-side memory is instead interpreted as an offset within the
buffer object measured in basic machine units.
While a non-zero buffer object is bound to the GL_ELEMENT_ARRAY_BUFFER target,
the indices parameter of glDrawElements that is traditionally
interpreted as a pointer to client-side memory is instead interpreted as an offset within the
buffer object measured in basic machine units.
A buffer object binding created with glBindBuffer remains active until a different
buffer object name is bound to the same target, or until the bound buffer object is
deleted with glDeleteBuffers.
Once created, a named buffer object may be re-bound to any target as often as needed. However, the GL implementation may make choices about how to optimize the storage of a buffer object based on its initial binding target.
glGet with argument GL_ARRAY_BUFFER_BINDING
glGet with argument GL_ELEMENT_ARRAY_BUFFER_BINDING
Copyright © 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/.