src = $(wildcard src/boot/*.asm) $(wildcard src/*.asm)
obj = $(src:.asm=.o)
data = data/sprsheet.inc
name = game
elf = $(name).elf
bin = $(name).bin

ASFLAGS = -f elf32
LDFLAGS = -m elf_i386 -T game.ld -print-gc-sections

QEMU_FLAGS = -fda floppy.img -serial file:serial.log -d guest_errors

.PHONY: all
all: floppy.img

floppy.img: boot.img
	dd of=$@ if=/dev/zero bs=512 count=2880
	dd of=$@ if=$< conv=notrunc

boot.img: bootldr.bin $(bin)
	cat $^ >$@

bootldr.bin: $(elf)
	objcopy -O binary -j '.boot*' $< $@

$(bin): $(elf) $(data)
	objcopy -O binary -R '.boot*' $< $@

$(elf): $(obj)
	$(LD) -o $@ $(obj) -Map link.map $(LDFLAGS)

%.o: %.asm
	nasm -o $@ $(ASFLAGS) $<

data/sprsheet.inc: data/sprsheet.png
	img2tiles -o $@ -n -t 32x32 $<

.PHONY: clean
clean:
	rm -f $(bin) $(obj) bootldr.bin floppy.img boot.img

.PHONY: disasm
disasm: bootldr.disasm $(name).disasm

bootldr.disasm: $(elf)
	objdump -d $< -j .boot -j .boot2 -m i8086 >$@

$(name).disasm: $(elf)
	objdump -d $< -j .text -m i386 >$@

$(name).sym: $(elf)
	objcopy --only-keep-debug $< $@

.PHONY: run
run: floppy.img
	qemu-system-i386 $(QEMU_FLAGS)

.PHONY: debug
debug: floppy.img
	qemu-system-i386 $(QEMU_FLAGS) -s -S

.PHONY: sym
sym: $(name).sym