# Specify our compiler
CXX := x86_64-w64-mingw32-g++
# Specify where our source files are
SOURCE_DIR := src
# Specify where our object and program files should go
BUILD_DIR := build/windows
# Specify our program's name
BINARY := game.exe

# Specify what flags to give to the compiler
CXX_FLAGS := -g -std=c++20 -Wall -Werror -Wextra -c -I ./lib/windows/include -D SDL_MAIN_HANDLED -D GLEW_STATIC

# Specify what flags to give to the linker
LINK_FLAGS := -lglew32s -lopengl32 -lSDL2 -L ./lib/windows/lib -static-libgcc -static-libstdc++

# Find all the source files
CXX_FILES := $(shell find $(SOURCE_DIR) -name *.cpp)

# Find all the source shaders
SHADER_FILES := $(shell find $(SOURCE_DIR) -name *.vert) $(shell find $(SOURCE_DIR) -name *.frag)

LIBS_DIR := lib/windows/bin
DLL_FILES := $(shell find $(LIBS_DIR) -name *.dll)

# Determine a list of object and dependency files from all the source files
OBJ_FILES := $(patsubst $(SOURCE_DIR)/%.cpp,$(BUILD_DIR)/%.o,$(CXX_FILES))
DEP_FILES := $(patsubst %.o,%.d,$(OBJ_FILES))
COPIED_FILES := $(patsubst $(SOURCE_DIR)/%,$(BUILD_DIR)/%,$(SHADER_FILES)) $(patsubst $(LIBS_DIR)/%,$(BUILD_DIR)/%,$(DLL_FILES))

.PHONY: program
program: $(BUILD_DIR)/$(BINARY) $(COPIED_FILES)

.PHONY: clean
clean:
	rm -rf $(BUILD_DIR)

$(BUILD_DIR)/$(BINARY): $(OBJ_FILES) $(BUILD_DIR)
	$(CXX) $(OBJ_FILES) $(LINK_FLAGS) -o "$@"

$(BUILD_DIR):
	mkdir -p $@

-include $(DEP_FILES)

$(BUILD_DIR)/%.o: $(SOURCE_DIR)/%.cpp
	@mkdir -p "$(@D)"
	$(CXX) $(CXX_FLAGS) -MMD -c "$<" -o "$@"

$(BUILD_DIR)/%.vert: $(SOURCE_DIR)/%.vert
	cp $< $@

$(BUILD_DIR)/%.frag: $(SOURCE_DIR)/%.frag
	cp $< $@

$(BUILD_DIR)/%: $(LIBS_DIR)/%
	cp $< $@