return the pointer to a mapped buffer object's data store
Specifies the target buffer object. The symbolic constant must be GL_ARRAY_BUFFER , GL_ATOMIC_COUNTER_BUFFER , GL_COPY_READ_BUFFER , GL_COPY_WRITE_BUFFER , GL_DRAW_INDIRECT_BUFFER , GL_DISPATCH_INDIRECT_BUFFER , GL_ELEMENT_ARRAY_BUFFER , GL_PIXEL_PACK_BUFFER , GL_PIXEL_UNPACK_BUFFER , GL_QUERY_BUFFER , GL_SHADER_STORAGE_BUFFER , GL_TEXTURE_BUFFER , GL_TRANSFORM_FEEDBACK_BUFFER , or GL_UNIFORM_BUFFER .
Specifies the pointer to be returned. The symbolic constant must be GL_BUFFER_MAP_POINTER .
Returns the pointer value specified by pname .
glGetBufferPointerv returns pointer information. pname is a symbolic constant indicating the pointer to be returned, which must be GL_BUFFER_MAP_POINTER , the pointer to which the buffer object's data store is mapped. If the data store is not currently mapped, NULL is returned. params is a pointer to a location in which to place the returned pointer value.
If an error is generated, no change is made to the contents of params .
The initial value for the pointer is NULL .
The GL_ATOMIC_COUNTER_BUFFER target is available only if the GL version is 4.2 or greater.
The GL_DISPATCH_INDIRECT_BUFFER and GL_SHADER_STORAGE_BUFFER targets are available only if the GL version is 4.3 or greater.
The GL_QUERY_BUFFER target is available only if the GL version is 4.4 or greater.
GL_INVALID_OPERATION is generated if the reserved buffer object name 0 is bound to target .
Copyright 2005 Addison-Wesley. Copyright 2011-2013 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/ .