Various changes

- add release build
- control framerate
- fix bug that caused camera to shake
- enable double-buffering and VSync

makefile

@@ -2,17 +2,19 @@ INC = include
 OBJ = obj
 SRC = src
 EXE = Game
+REL = Release
 
 CC = gcc
 CFLAGS = -w -ggdb -I$(INC)
 LIBS = -lGLEW -lGLU -lGL -lSDL2 -lcglm -lz -lm
+RELFLAGS = -O3 -s
 
 OBJFILES := $(patsubst $(SRC)/%.c, $(OBJ)/%.o, $(shell find $(SRC) -name '*.c'))
 OBJDIRS := $(patsubst $(SRC)%, $(OBJ)%, $(shell find $(SRC) -type d))
 CLEANDIRS := $(addsuffix /.clean, $(OBJDIRS));
 
 # Explicit targets
-.PHONY: all clean
+.PHONY: all release clean
 .DEFAULT_GOAL := all
 
 # Build executable
@@ -28,8 +30,12 @@ $(OBJ)/%.o: $(SRC)/%.c | $(OBJDIRS)
 $(OBJDIRS):
 	mkdir -p $@
 
+release: $(REL)
+$(REL): $(OBJFILES) | $(OBJDIRS)
+	$(CC) -o $@ $^ $(CFLAGS) $(LIBS) $(RELFLAGS)
+
 # Delete previously built files
 clean: $(CLEANDIRS)
-	rm -f $(EXE)
+	rm -f $(EXE) $(REL)
 %.clean:
 	rm -f $**.o