CC = emcc
CXX = em++
WEB_DIR = web
EXE = $(WEB_DIR)/index.html
IMGUI_DIR = ../..
SOURCES = main.cpp
SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdl2.cpp $(IMGUI_DIR)/backends/imgui_impl_cpu.cpp
OBJS = $(addprefix em_,$(addsuffix .o, $(basename $(notdir $(SOURCES)))))
CPPFLAGS =
LDFLAGS =
EMS =

EMS += -s USE_SDL=2
EMS += -s DISABLE_EXCEPTION_CATCHING=1
LDFLAGS += -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=0 -s ASSERTIONS=1

USE_FILE_SYSTEM ?= 0
ifeq ($(USE_FILE_SYSTEM), 0)
LDFLAGS += -s NO_FILESYSTEM=1
CPPFLAGS += -DIMGUI_DISABLE_FILE_FUNCTIONS
endif
ifeq ($(USE_FILE_SYSTEM), 1)
LDFLAGS += --no-heap-copy --preload-file ../../misc/fonts@/fonts
endif

CPPFLAGS += -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
CPPFLAGS += -Wall -Wformat -O2 $(EMS)
LDFLAGS += --shell-file ../libs/emscripten/shell_minimal.html
LDFLAGS += $(EMS)

em_%.o:%.cpp
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<

em_%.o:$(IMGUI_DIR)/%.cpp
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<

em_%.o:$(IMGUI_DIR)/backends/%.cpp
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<

all: $(EXE)
	@echo Build complete for $(EXE)

$(WEB_DIR):
	mkdir $@

serve: all
	python3 -m http.server -d $(WEB_DIR)

$(EXE): $(OBJS) $(WEB_DIR)
	$(CXX) -o $@ $(OBJS) $(LDFLAGS)

clean:
	rm -rf $(OBJS) $(WEB_DIR)