restructured some files

tools/gl/Makefile.mingw

@@ -0,0 +1,22 @@
+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=-static -lglfw3 -lglew32 -lopengl32 -lgdi32
+CFLAGS=-g -I$(RWDIR) -Wall -Wextra -DGLEW_STATIC
+
+rwtest: $(OBJ) $(RWDIR)/librw-opengl.a
+	$(CXX) $^ $(LDLIBS) -o $@
+
+$(BUILDDIR)/%.o: %.cpp
+	@mkdir -p $(@D)
+	$(CXX) $(CFLAGS) -c $< -o $@
+
+$(BUILDDIR)/%.d: %.cpp
+	@mkdir -p $(@D)
+	$(CXX) -MM -MT '$(patsubst %.cpp,$(BUILDDIR)%.o,$<)' $(CFLAGS) $< > $@
+
+dep: $(DEP)
+
+-include $(DEP)