glBindBuffer man page on MacOSX
[printable version]
GLBINDBUFFER(3G) OpenGL 3.3 GLBINDBUFFER(3G)
NAME
glBindBuffer - bind a named buffer object
C SPECIFICATION
void glBindBuffer(GLenum target, GLuint buffer);
PARAMETERS
target
Specifies the target to which the buffer object is bound. 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.
buffer
Specifies the name of a buffer object.
DESCRIPTION
glBindBuffer binds a buffer object to the specified buffer binding
point. Calling glBindBuffer with target set to one of the accepted
symbolic constants and buffer set to the name of a buffer object binds
that buffer object name to the target. If no buffer object with name
buffer exists, one is created with that name. 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 (if supported for that target). Buffer object names and
the corresponding buffer object contents are local to the shared object
space of the current GL rendering context; two rendering contexts share
buffer object names only if they explicitly enable sharing between
contexts through the appropriate GL windows interfaces functions.
glGenBuffers() must be used to generate a set of unused buffer object
names.
The state of a buffer object immediately after it is first bound is an
unmapped zero-sized memory buffer with GL_READ_WRITE access and
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 a non-zero buffer object is bound to the GL_ARRAY_BUFFER target,
the vertex array pointer parameter is 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(),
glDrawElementsInstanced(), glDrawElementsBaseVertex(),
glDrawRangeElements(), glDrawRangeElementsBaseVertex(),
glMultiDrawElements(), or glMultiDrawElementsBaseVertex() is
interpreted as an offset within the buffer object measured in basic
machine units.
While a non-zero buffer object is bound to the GL_PIXEL_PACK_BUFFER
target, the following commands are affected: glGetCompressedTexImage(),
glGetTexImage(), and glReadPixels(). The pointer parameter is
interpreted as an offset within the buffer object measured in basic
machine units.
While a non-zero buffer object is bound to the GL_PIXEL_UNPACK_BUFFER
target, the following commands are affected: glCompressedTexImage1D(),
glCompressedTexImage2D(), glCompressedTexImage3D(),
glCompressedTexSubImage1D(), glCompressedTexSubImage2D(),
glCompressedTexSubImage3D(), glTexImage1D(), glTexImage2D(),
glTexImage3D(), glTexSubImage1D(), glTexSubImage2D(), and
glTexSubImage3D(). The pointer parameter is interpreted as an offset
within the buffer object measured in basic machine units.
The buffer targets GL_COPY_READ_BUFFER and GL_COPY_WRITE_BUFFER are
provided to allow glCopyBufferSubData() to be used without disturbing
the state of other bindings. However, glCopyBufferSubData() may be used
with any pair of buffer binding points.
The GL_TRANSFORM_FEEDBACK_BUFFER buffer binding point may be passed to
glBindBuffer, but will not directly affect transform feedback state.
Instead, the indexed GL_TRANSFORM_FEEDBACK_BUFFER bindings must be used
through a call to glBindBufferBase() or glBindBufferRange(). This will
affect the generic GL_TRANSFORM_FEEDABCK_BUFFER binding.
Likewise, the GL_UNIFORM_BUFFER buffer binding point may be used, but
does not directly affect uniform buffer state. glBindBufferBase() or
glBindBufferRange() must be used to bind a buffer to an indexed uniform
buffer binding point.
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.
NOTES
The GL_COPY_READ_BUFFER, GL_UNIFORM_BUFFER and GL_TEXTURE_BUFFER
targets are available only if the GL version is 3.1 or greater.
ERRORS
GL_INVALID_ENUM is generated if target is not one of the allowable
values.
GL_INVALID_VALUE is generated if buffer is not a name previously
returned from a call to glGenBuffers().
ASSOCIATED GETS
glGet() with argument GL_ARRAY_BUFFER_BINDING
glGet() with argument GL_COPY_READ_BUFFER_BINDING
glGet() with argument GL_COPY_WRITE_BUFFER_BINDING
glGet() with argument GL_ELEMENT_ARRAY_BUFFER_BINDING
glGet() with argument GL_PIXEL_PACK_BUFFER_BINDING
glGet() with argument GL_PIXEL_UNPACK_BUFFER_BINDING
glGet() with argument GL_TRANSFORM_FEEDBACK_BUFFER_BINDING
glGet() with argument GL_UNIFORM_BUFFER_BINDING
SEE ALSO
glGenBuffers(), glBindBufferBase(), glBindBufferRange(), glMapBuffer(),
glUnmapBuffer(), glDeleteBuffers(), glGet(), glIsBuffer()
COPYRIGHT
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/.
OpenGL 3.3 03/08/2011 GLBINDBUFFER(3G)
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