Added OpenGL test.

tests/gl/Makefile

@@ -0,0 +1,21 @@
+BUILDDIR = build
+SRC = main.cpp glshader.cpp math.cpp camera.cpp
+OBJ = $(patsubst %.cpp, $(BUILDDIR)/%.o, $(SRC))
+DEP = $(patsubst %.cpp, $(BUILDDIR)/%.d, $(SRC))
+RWDIR=$(HOME)/src/librw
+LDLIBS=-pthread -lX11 -lXrandr -lXi -lXxf86vm -lGL -lGLEW -lm
+CFLAGS=-g -I$(RWDIR) -Wall -Wextra
+
+rwtest: $(OBJ) $(RWDIR)/librw-opengl.a /usr/local/lib/libglfw3.a
+	$(CXX) $^ $(LDLIBS) -o $@
+
+$(BUILDDIR)/%.o: %.cpp
+	$(CXX) $(CFLAGS) -c $< -o $@
+
+$(BUILDDIR)/%.d: %.cpp
+	$(CXX) -MM -MT '$(patsubst %.cpp,$(BUILDDIR)%.o,$<)' $(CFLAGS) $< > $@
+
+clean:
+	rm $(BUILDDIR)/* rwtest
+
+-include $(DEP)