CXX = g++
CXXFLAGS = -std=c++11 -g -ggdb -Wall -I/usr/include/SDL2 -Iext/aixlog/include
SRC_DIR = src
OBJ_DIR = build

# TODO: incorporate imgui into project files and not use gl3w
# 	can also remove -ldl from LDFLAGS then
CC = gcc
GL3W_CFLAGS = -Wall -I$(IMGUI_DIR)/examples/libs/gl3w
CXXFLAGS += -I$(IMGUI_DIR)/examples/libs/gl3w
GL3W_LDFLAGS += -ldl

# libGLEW needs to be >= 2.0.0 to use opengl core context
#	don't know a good way to require this in make without forcing a specific version
LDFLAGS = -lSDL2 -lGLEW -lGL

# SDL2_image
CXXFLAGS += $(shell pkg-config --cflags SDL2_image)
LDFLAGS += $(shell pkg-config --libs SDL2_image)

# IMGUI
IMGUI_DIR = ext/imgui
CXXFLAGS += -I$(IMGUI_DIR)\
			-I$(IMGUI_DIR)/examples/sdl_opengl3_example\
			-I$(IMGUI_DIR)/examples/libs/gl3w
IMGUI_SOURCES = $(IMGUI_DIR)/imgui.cpp \
		  $(IMGUI_DIR)/imgui_demo.cpp \
		  $(IMGUI_DIR)/imgui_draw.cpp \
		  $(IMGUI_DIR)/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp \

IMGUI_OBJECTS := $(patsubst %.cpp, $(OBJ_DIR)/%.o, $(notdir $(IMGUI_SOURCES)))

# assimp
LDFLAGS += -lassimp


SOURCES = $(wildcard $(SRC_DIR)/*.cpp)
OBJECTS = $(patsubst $(SRC_DIR)/%.cpp,$(OBJ_DIR)/%.o,$(SOURCES))

all: $(IMGUI_OBJECTS) $(OBJ_DIR)/gl3w.o $(OBJECTS)
	$(CXX) -o $(OBJ_DIR)/hexgame $(LDFLAGS) $(GL3W_LDFLAGS) $(OBJ_DIR)/*.o
	mkdir -p bin
	mv $(OBJ_DIR)/hexgame bin

-include $(OBJ_DIR)/*.d

$(OBJECTS): $(OBJ_DIR)/%.o : $(SRC_DIR)/%.cpp
	$(CXX) $(CXXFLAGS) -c -MMD $< -o $@

info:
	@echo "SOURCES:"
	@echo $(SOURCES)
	@echo "OBJECTS:"
	@echo $(OBJECTS)

# NOTE: couldn't find a nicer way to put these object files into build directory :(
$(OBJ_DIR)/imgui.o:
	$(CXX) -c $(CXXFLAGS) $(IMGUI_DIR)/imgui.cpp -o $@

$(OBJ_DIR)/imgui_demo.o:
	$(CXX) -c $(CXXFLAGS) $(IMGUI_DIR)/imgui_demo.cpp -o $@

$(OBJ_DIR)/imgui_draw.o:
	$(CXX) -c $(CXXFLAGS) $(IMGUI_DIR)/imgui_draw.cpp -o $@

$(OBJ_DIR)/imgui_impl_sdl_gl3.o:
	$(CXX) -c $(CXXFLAGS) $(IMGUI_DIR)/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp -o $@

$(OBJ_DIR)/gl3w.o:
	$(CC) -c $(GL3W_CFLAGS) $(IMGUI_DIR)/examples/libs/gl3w/GL/gl3w.c -o $@

.PHONY: clean
clean:
	rm -f bin/hexgame $(OBJ_DIR)/*