CMake: Build direct.motiontrail

This covers pretty much all of direct, except for directd.

direct/CMakeLists.txt

@@ -10,16 +10,14 @@ add_subdirectory(src/deadrec)
 #add_subdirectory(src/directdServer)
 #add_subdirectory(src/directd)
 add_subdirectory(src/distributed)
-#add_subdirectory(src/heapq)
-#add_subdirectory(src/http)
 add_subdirectory(src/interval)
-#add_subdirectory(src/motiontrail)
+add_subdirectory(src/motiontrail)
 add_subdirectory(src/showbase)
 
 # TODO: p3direct needs a source file!
 set(P3DIRECT_COMPONENTS
-  p3dcparser p3deadrec
-  p3interval p3showbase)
+  p3dcparser p3deadrec p3interval
+  p3motiontrail p3showbase)
 if(HAVE_PYTHON)
   list(APPEND P3DIRECT_COMPONENTS p3distributed)
 endif()
@@ -27,7 +25,9 @@ add_metalib(p3direct COMPONENTS ${P3DIRECT_COMPONENTS})
 set_property(TARGET p3direct PROPERTY LINKER_LANGUAGE "CXX")
 
 if(HAVE_PYTHON)
-  add_python_module(direct p3dcparser p3deadrec p3distributed p3interval p3showbase LINK p3direct IMPORT panda3d.core)
+  add_python_module(direct
+    p3dcparser p3deadrec p3distributed p3interval
+    p3motiontrail p3showbase LINK p3direct IMPORT panda3d.core)
 
   # Make an __init__.py pointing at the source directory so users can run
   # Panda3D code straight from their build path:

direct/src/motiontrail/CMakeLists.txt

@@ -0,0 +1,15 @@
+set(P3MOTIONTRAIL_HEADERS
+    config_motiontrail.h
+    cMotionTrail.h)
+
+set(P3MOTIONTRAIL_SOURCES
+    config_motiontrail.cxx
+    cMotionTrail.cxx)
+
+add_component_library(p3motiontrail SYMBOL BUILDING_DIRECT_MOTIONTRAIL
+  ${P3MOTIONTRAIL_HEADERS} ${P3MOTIONTRAIL_SOURCES})
+target_link_libraries(p3motiontrail p3directbase panda)
+target_interrogate(p3motiontrail ALL)
+
+install(TARGETS p3motiontrail DESTINATION lib)
+install(FILES ${P3MOTIONTRAIL_HEADERS} DESTINATION include/panda3d)