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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 (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                                 GLBINDBUFFER(3G)