Function Nirvana_LoadStage(stage_name$, viewport_x, viewport_y, viewport_w, viewport_h)
Sub Nirvana_SetStageViewport(v_position As Nirvana_Vector2D, v_size As Nirvana_Size2D)
Function Nirvana_GetViewportPosition() As Nirvana_Vector2D
Function Nirvana_GetViewportSize() As Nirvana_Size2D
Sub Nirvana_SetStageOffset(offset As Nirvana_Vector2D)
Function Nirvana_GetStageOffset() As Nirvana_Vector2D
Sub Nirvana_Update()