# Part of JoeyLib, Copyright (c) 2026 Scott Duensing, under the MIT License.
# See LICENSE.md for license information.
# SPDX-License-Identifier: MIT
#
# Amiga (Bebbo m68k-amigaos-gcc) build rules: JoeyLib's library for the
# Amiga, and programRules, the Amiga's rules for one program, which
# make/programs.mk instantiates for every program (a project reaches both
# through make/project.mk). JoeyLib's own examples are at the end.

PLATFORM := amiga
include $(dir $(lastword $(MAKEFILE_LIST)))/common.mk

$(call requireTool,$(AMIGA_CC),toolchain:amiga)
$(call requireTool,$(AMIGA_AS),toolchain:amiga)
$(call requireTool,$(AMIGA_PTPLAYER)/ptplayer.asm,toolchain:amiga)

# PTPlayer is installed by ./install.sh (AMIGA_PTPLAYER); we
# reference its ptplayer.asm + header from there rather than copying
# them into the source tree, so the installer can refresh / version it
# independently. -I on $(SRC_DIR)/amiga lets ptplayer.h resolve
# <SDI_compiler.h> from the machine-local shim alongside our code.
PTPLAYER_DIR := $(AMIGA_PTPLAYER)
CFLAGS  := $(COMMON_CFLAGS) -m68000 -fomit-frame-pointer -noixemul -D__OSCOMPAT -I$(SRC_DIR)/amiga -I$(SRC_68K) -I$(PTPLAYER_DIR) -MMD -MP
# OSCOMPAT=1 selects PTPlayer's audio.device-friendly variant (uses
# CIA-B + audio.device interrupts via the OS rather than taking over
# Paula directly), matching the way our HAL cooperates with Intuition.
# vasm is only invoked for ptplayer.asm here -- Frank Wille's source
# is written in Devpac/vasm syntax and there is no maintained GAS-
# syntax port. JoeyLib's own .s files are GAS syntax and assembled by
# the bundled m68k-amigaos-as via the gcc driver.
# -Fhunk matches Bebbo gcc-amigaos's AmigaOS HUNK object format. ELF
# objects from vasm cannot be linked into a HUNK libjoey.a (the ar
# "file format not recognized" failure mode is silent at archive time
# and surfaces as undefined references at every binary's link step).
PTPLAYER_ASFLAGS := -Fhunk -m68000 -quiet -DOSCOMPAT=1
# --allow-multiple-definition lets our user-space tzset stub
# (src/amiga/libinit.c) win over libnix's version in
# __gmtoffset.o. libnix's tzset dereferences a possibly-NULL
# LocaleBase; our no-op skips the deref.
LDFLAGS := -noixemul -Wl,--allow-multiple-definition

PORT_C_SRCS := $(wildcard $(SRC_DIR)/amiga/*.c)
PORT_S_SRCS := $(wildcard $(SRC_DIR)/amiga/*.s)
SHARED_S    := $(wildcard $(SRC_68K)/*.s)

# Amiga uses PTPlayer's mt_playfx for SFX, not the libxmp+overlay
# combo that DOS and ST share, so the shared SFX overlay mixer in
# src/core/audioSfxMix.c is unused here. Filter it out to keep dead
# code out of every Amiga binary.
CORE_C_SRCS_AMIGA := $(filter-out %/audioSfxMix.c, $(CORE_C_SRCS))

# Sprite codegen: the Amiga-planar emitter (spriteEmitPlanar68k.c) lives in
# src/m68k/ and builds into obj/68k/; only the CPU-independent dispatch stays
# in src/codegen.
CODEGEN_DIR := $(REPO_DIR)/src/codegen

LIB_OBJS := \
    $(patsubst $(SRC_CORE)/%.c,$(BUILD)/obj/core/%.o,$(CORE_C_SRCS_AMIGA)) \
    $(patsubst $(SRC_DIR)/generic/%.c,$(BUILD)/obj/generic/%.o,$(GENERIC_C_SRCS)) \
    $(patsubst $(SRC_DIR)/amiga/%.c,$(BUILD)/obj/port/%.o,$(PORT_C_SRCS)) \
    $(patsubst $(SRC_DIR)/amiga/%.s,$(BUILD)/obj/port/%.o,$(PORT_S_SRCS)) \
    $(patsubst $(SRC_68K)/%.s,$(BUILD)/obj/68k/%.o,$(SHARED_S)) \
    $(BUILD)/obj/port/ptplayer.o \
    $(BUILD)/obj/68k/spriteEmitPlanar68k.o \
    $(BUILD)/obj/codegen/spriteCompile.o \
    $(BUILD)/obj/codegen/spriteStage.o

LIB := $(LIBDIR)/libjoey.a

$(BUILD)/obj/core/%.o: $(SRC_CORE)/%.c
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -c $< -o $@

$(BUILD)/obj/generic/%.o: $(SRC_DIR)/generic/%.c
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -c $< -o $@

$(BUILD)/obj/port/%.o: $(SRC_DIR)/amiga/%.c
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -c $< -o $@

# Hand-written 68k assembly: GAS syntax, fed through the gcc driver
# so the bundled m68k-amigaos-as (binutils) does the work.
$(BUILD)/obj/port/%.o: $(SRC_DIR)/amiga/%.s
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -c $< -o $@

# PTPlayer is third-party Devpac/vasm-syntax assembly with no
# maintained GAS port; vasm is invoked only here.
$(BUILD)/obj/port/ptplayer.o: $(PTPLAYER_DIR)/ptplayer.asm
	@mkdir -p $(dir $@)
	$(AMIGA_AS) $(PTPLAYER_ASFLAGS) $< -o $@

$(BUILD)/obj/codegen/%.o: $(CODEGEN_DIR)/%.c
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -I$(CODEGEN_DIR) -c $< -o $@

$(BUILD)/obj/68k/%.o: $(SRC_68K)/%.s
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -c $< -o $@

# 68k sprite emitters (spriteEmitPlanar68k.c) live in src/m68k/;
# -I$(CODEGEN_DIR) lets them resolve spriteEmitter.h.
$(BUILD)/obj/68k/%.o: $(SRC_68K)/%.c
	@mkdir -p $(dir $@)
	$(AMIGA_CC) $(CFLAGS) -I$(CODEGEN_DIR) -c $< -o $@

# Archived from scratch, so the members -- and every program's layout --
# follow LIB_OBJS rather than the order earlier builds added them in.
$(LIB): $(LIB_OBJS)
	@mkdir -p $(dir $@)
	rm -f $@
	$(AMIGA_AR) rcs $@ $^

# Pull in per-object header-dependency files generated by gcc -MMD/-MP.
# Without this, editing a header (e.g. surfaceInternal.h) doesn't rebuild
# the .c files that include it, leaving a frankenstein binary where
# different TUs see different struct layouts.
-include $(LIB_OBJS:.o=.d)

# ---- programs -----------------------------------------------------------------
# A program is a mixed-case Name with no extension (an AmigaDOS name), in bin/
# or in its own bin/Name/ with its DATA beside it; joey-run boots the folder
# as the JOEYLIB hard drive.
PROGRAM_EXT     :=
PROGRAM_FOLDERS := yes
programNameRule  = $(call capFirst,$(call lc,$(1)))

# One program, $(1) its id: compiled and linked in one step with the library.
# gcc's -MMD leaves Name.d beside it, for header edits.
define programRules
$(call programBin,$(1)): $(call programVar,$(1),SRCS) $(LIB)
	@mkdir -p $$(dir $$@)
	$(AMIGA_CC) $(CFLAGS) $(call programVar,$(1),CFLAGS) $(call programVar,$(1),SRCS) $(LIB) -o $$@ $(LDFLAGS) $(call programVar,$(1),LDFLAGS)
-include $(call programBin,$(1)).d
endef

# ---- JoeyLib's own build: its examples ------------------------------------------
ifndef JOEY_PROJECT

include $(REPO_DIR)/make/examples.mk
include $(REPO_DIR)/make/programs.mk

.DEFAULT_GOAL := all
.PHONY: all amiga clean-amiga clean
all amiga: $(LIB) programs

clean-amiga:
	rm -rf $(BUILD)

# `clean` as an alias for `clean-amiga`. Without it a bare
# `make -f make/amiga.mk clean` FAILS -- and with stderr discarded that
# looks like success while leaving stale objects the next build links.
clean: clean-amiga

endif