%mathent; ]> 2005 Sams Publishing 2010-2014 Khronos Group glGetBufferParameter 3G glGetBufferParameter return parameters of a buffer object void glGetBufferParameteriv GLenum target GLenum value GLint * data void glGetBufferParameteri64v GLenum target GLenum value GLint64 * data 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_TRANSFORM_FEEDBACK_BUFFER, or GL_UNIFORM_BUFFER. value Specifies the symbolic name of a buffer object parameter. Accepted values are GL_BUFFER_ACCESS_FLAGS, GL_BUFFER_MAPPED, GL_BUFFER_MAP_LENGTH, GL_BUFFER_MAP_OFFSET, GL_BUFFER_SIZE, or GL_BUFFER_USAGE. data Returns the requested parameter. glGetBufferParameteriv and glGetBufferParameteri64v return in data a selected parameter of the buffer object specified by target. value names a specific buffer object parameter, as follows: GL_BUFFER_ACCESS_FLAGS params returns the access policy set while mapping the buffer object. GL_BUFFER_MAPPED params returns a flag indicating whether the buffer object is currently mapped. The initial value is GL_FALSE. GL_BUFFER_MAP_LENGTH params returns the length of the buffer object mapping, measured in bytes. The initial value is 0. GL_BUFFER_MAP_OFFSET params returns the offset (start) of the buffer object mapping, measured in bytes. The initial value is 0. GL_BUFFER_SIZE params returns the size of the buffer object, measured in bytes. The initial value is 0. GL_BUFFER_USAGE params returns the buffer object's usage pattern. If an error is generated, no change is made to the contents of data. If glGetBufferParameteriv is used to query a value of GL_BUFFER_SIZE, values greater than or equal to 2 31 will be clamped to 2 31 - 1 . GL_INVALID_ENUM is generated if target or value is not an accepted value. GL_INVALID_OPERATION is generated if the reserved buffer object name 0 is bound to target. GL_INVALID_ENUM is generated if glGetBufferParameteri64v is used to query a value of GL_BUFFER_ACCESS_FLAGS, GL_BUFFER_MAPPED or GL_BUFFER_USAGE. GL_INVALID_ENUM is generated if glGetBufferParameteriv is used to query a value of GL_BUFFER_MAP_LENGTH or GL_BUFFER_MAP_OFFSET. glGetBufferParameteriv glGetBufferParameteri64v glBindBuffer, glBufferData, glMapBufferRange, glUnmapBuffer 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. http://opencontent.org/openpub/.