# Specify our compiler
CXX := g++
# Specify where our source files are
SOURCE_DIR := src
# Specify where our object and program files should go
BUILD_DIR := build/linux
# Specify our program's name
BINARY := game

# Specify what flags to give to the compiler
CXX_FLAGS := -g -std=c++20 -Wall -Werror -Wextra -c

# Specify what flags to give to the linker
LINK_FLAGS := -lSDL2 -lGL -lGLEW -lGLU -lpthread

# 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)

# 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))

.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 $< $@
