glMapBuffer

Specifies the target buffer object being mapped. 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 .

For glMapBuffer only, specifies the access policy, indicating whether it will be possible to read from, write to, or both read from and write to the buffer object's mapped data store. The symbolic constant must be GL_READ_ONLY , GL_WRITE_ONLY , or GL_READ_WRITE .