# Makefile for Atari 800 Taipan, by B. Watson
# Written for GNU make, but seems to work with BSD make (though
# I don't test BSD make every time I change anything).

# cl65 binary:
CC=cl65

# System cl65 will compile for. Don't expect this to work if you change it
# (though possibly atarixl might work, with newer cc65s)
SYS=atari

# Optimization flags for cc65.
#COPT=-Oirs
COPT=-O

# This is used for embedding the date and git hash in the game binary.
# It'll appear on the "name your firm" screen.
VERSION="v0.99alpha-`date +%Y%m%d`-`git rev-parse --short HEAD 2>/dev/null || echo UNKNOWN`"

# for older cc65, we need a custom linker file.
#CFLAGS=-t $(SYS) -C custom.cfg -I. -L. $(COPT)

# for recent git cc65, we can reserve memory on the command line.
# -D__RESERVED_MEMORY__=1056 because cc65's default end of memory
# is $BC20, and we want it to end just below our font, which starts
# at $B800. cc65's runtime stack starts just below this, and is
# 2K in size (bottom is at 0xb000).
# -D__SYSTEM_CHECK__=1 stops cl65 from prepending a bit of code that
# checks to make sure there's enough memory. Older cc65 didn't do this,
# and I never missed it.
# The meaning of the -l flag is different between cc65-2.13.3
# and the later github cc65, so it's been removed here.
CFLAGS=-t $(SYS) -T -I. -L. -DVERSION=\"$(VERSION)\" -Wl -D__SYSTEM_CHECK__=1 -Wl -D__RESERVED_MEMORY__=1056 $(COPT)
AS=ca65
ASFLAGS=
AR=ar65

# C compiler for host system. Currently only used for building convfont.
HOSTCC=gcc
HOSTCFLAGS=-Wall

# A few files have no make rules here. LORCHA.DAT is generated as a
# side-effect of generating taifont.xex. It's a 49-byte (7x7) blob of
# Atari "internal" screen codes.

# LORCHA.DAT, and PORTSTAT.DAT aren't deleted by a
# 'make clean'.

# romfont is the 1K font extracted from the Atari 800 OS, with a
# command like:
# dd if=atariosb.rom of=1 bs=256 skip=8 count=4
# ...where atariosb.rom comes from e.g. the PC-Xformer 2.5 zip file.

# The game binary:
XEX=taipan.xex

# Default rule for plain 'make' command is to build the binary.
all: $(XEX)

# I have F10 in my editor bound to 'make test', so:
test: all
	atari800 -nobasic $(XEX)

# old title
#$(XEX): taimain.xex taifont.xex title.xex
#	cat taifont.xex title.xex taimain.xex > $(XEX)

# The game binary is a multi-part binary load file. This rule
# depends on all the pieces, and just concatenates them.
$(XEX): taimain.xex taifont.xex newtitle.xex titledata.xex
	cat titledata.xex newtitle.xex taifont.xex taimain.xex > $(XEX)

# Bitmap data for the title screen, 256x184 = 47104 pixels, 8 bits
# per pixel, or 5888 bytes. Displayed in ANTIC mode F (aka GR.8),
# using GTIA narrow playfield. The original title screen for the Apple
# is a 280x192 bitmap with a few blank lines at the top & bottom. I
# squished it horizontally to 256 pixels and got rid of the blank lines,
# to save load time.
titledata.xex: newtitle.pl newtitle.png
	perl newtitle.pl > titledata.xex

# Init segment that loads after the title screen data. It sets up
# a custom display list and sets the GTIA for narrow playfield,
# then waits for a keypress. Afterwards, it restores the OS's
# display list and sets the GTIA back to normal, then exits.
# Notice this is built with "-t none" instead of "-t atari",
# since it's a lot easier to homebrew an init segment than it is
# to get cc65 to build an init segment (would need a custom linker
# script at least).
newtitle.xex: newtitle.s
	cl65 -o newtitle.xex -t none newtitle.s

# former textmode title screen, was generated by TITLE.LST. Replaced
# by graphical title screen.
#title.xex: TITLE.DAT
#	perl title.pl TITLE.DAT > title.xex

# The main executable. All the C and asm code goes here, except the init
# segment in newtitle.s.
taimain.xex: taipan.c rand.s draw_lorcha.s timed_getch.s jsleep.s portstat.s clrtobot.s
	cl65 --mapfile taipan.map $(CFLAGS) -o taimain.xex taipan.c rand.s draw_lorcha.s timed_getch.s jsleep.s portstat.s clrtobot.s

# With newer cc65s, I have to do this to get an assembly listing of just
# taipan.c. This rule not used as part of the main build, it's only for
# debugging.
taipan.lst: taipan.c
	cl65 --mapfile taipan.map $(CFLAGS) -c -o /dev/null -l taipan.lst -T taipan.c

# The font gets loaded into RAM, in the area reserved by the
# -D__RESERVED_MEMORY__ option to cl65. To actually use the font,
# taimain.xex contains code that sets CHBAS ($02f4).
# Not mentioned in any make rule: convfont also creates LORCHA.DAT,
# which draw_lorcha.s depends on (so we touch draw_lorcha.s here).
taifont.xex: convfont romfont font
	cat romfont font | ./convfont -x > taifont.xex
	touch draw_lorcha.s

# Not part of the game binary. This just builds the font without the
# Atari 6-byte binary load header, for eyeballing it in bitmapdump.pl
# or converting to other formats.
taifont: convfont romfont font
	cat romfont font | ./convfont > taifont

# PORTSTAT.DAT gets incbin'ed directly in portstat.s. It's screen-code
# data for the static part of the port status screen, which ends up in
# an array that the C code can memcpy() into screen RAM as needed.
# This make rule actually runs atari800. For it to work, you'll need
# the H: device enabled, pointed at the current directory, and set
# to writable.
PORTSTAT.DAT: mkportstats.xex
	atari800 -nobasic mkportstats.xex
	touch portstat.s

# Host tool that builds our custom font from the data ripped out of
# the Apple version, plus the Atari OS ROM. Also, all the custom
# characters for the enemy ships are defined here (as hex data. Yes,
# I converted them manually from eyeballing a screenshot of the Apple
# combat screen).
convfont: convfont.c
	$(HOSTCC) $(HOSTCFLAGS) -o convfont convfont.c

# Rules for building various file types with the cc65 toolchain.
.s.o:
	$(AS) $(ASFLAGS) -o $@ $<

.c.o:
	$(CC) $(CFLAGS) -c -o $@ $<

%.xex: %.c
	$(CC) --mapfile map $(CFLAGS) -o $@ $<

# Obligatory clean and distclean rules.
clean:
	rm -f *.o *.lst convfont *.xex AUTORUN.SYS

distclean: clean
	rm -f *~ core .*.swp 1.* 2.* 1 2 3 map map.* *.map a b c foo bar baz

# Cruft. Was used for testing the enemy ship animation.
lorchatest: lorchatest.c draw_lorcha.s taifont.xex
	cl65 -t atari -O -T -o lorchatest1.xex lorchatest.c draw_lorcha.s
	cat taifont.xex lorchatest1.xex > lorchatest.xex
	atari800 -nobasic lorchatest.xex