Tidied up Makefile comments, added recording makefile

doc/examples/Makefile

@@ -1,3 +1,6 @@
+# We do not automatically build the recording agent, which requires SDL. To build it, run
+#
+# > make recordingAgent
 all: sharedLibraryAgent rlglueAgent fifoAgent
 
 sharedLibraryAgent: 
@@ -9,7 +12,11 @@ rlglueAgent:
 fifoAgent: 
 	make -f Makefile.fifo
 
+recordingAgent: 
+	make -f Makefile.recording
+
 clean:
 	make -f Makefile.rlglue clean
 	make -f Makefile.sharedlibrary clean
 	make -f Makefile.fifo clean
+	make -f Makefile.recording clean

doc/examples/Makefile.recording

@@ -0,0 +1,37 @@
+# Modified from the sharedLibraryInterface's makefile.
+# Video recording requires SDL. If you do not have SDL installed, you will not be able to
+# compile this example.
+#
+# > make recordingAgent 
+
+USE_SDL := 1
+
+# This will likely need to be changed to suit your installation.
+ALE := ../..
+
+FLAGS := -I$(ALE)/src -I$(ALE)/src/controllers -I$(ALE)/src/os_dependent -I$(ALE)/src/environment -I$(ALE)/src/external -L$(ALE)
+CXX := g++
+FILE := videoRecordingExample
+LDFLAGS := -lale -lz
+
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Linux)
+    FLAGS += -Wl,-rpath=$(ALE)
+endif
+ifeq ($(UNAME_S),Darwin)
+    FLAGS += -framework Cocoa
+endif
+
+ifeq ($(strip $(USE_SDL)), 1)
+  DEFINES += -D__USE_SDL -DSOUND_SUPPORT
+  FLAGS += $(shell sdl-config --cflags)
+  LDFLAGS += $(shell sdl-config --libs)
+endif
+
+all: videoRecordingExample
+
+videoRecordingExample:
+	$(CXX) $(DEFINES) $(FLAGS) $(FILE).cpp $(LDFLAGS) -o $(FILE)
+
+clean:
+	rm -rf videoRecordingExample *.o

doc/examples/Makefile.sharedlibrary

@@ -1,5 +1,3 @@
-# Modified from the RL-Glue C/C++ codec sharedLibraryInterfaceExample's makefile.
-
 USE_SDL := 0
 
 # This will likely need to be changed to suit your installation.