HAVE_STATIC_DUMMY ?= 0
ifeq ($(TARGET),)
ifeq ($(LIBRETRO),)
TARGET := retroarch.js
LIBRETRO = dummy
else
TARGET := $(LIBRETRO)_libretro.js
endif
endif

EOPT = USE_ZLIB=1 # Emscripten specific options
EOPTS = $(addprefix -s $(EMPTY), $(EOPT)) # Add '-s ' to each option

OS = Emscripten
OBJ :=
DEFINES := -DRARCH_INTERNAL -DHAVE_MAIN
DEFINES += -DHAVE_FILTERS_BUILTIN
HAVE_PATCH = 1
HAVE_DSP_FILTER = 1
HAVE_VIDEO_FILTER = 1
HAVE_OVERLAY = 1
HAVE_GLSL = 1
HAVE_SCREENSHOTS = 1
HAVE_REWIND = 1
HAVE_AUDIOMIXER = 1
HAVE_CC_RESAMPLER = 1
HAVE_EGL    = 1
HAVE_OPENGLES = 1
HAVE_RJPEG  = 0
HAVE_RPNG   = 1
HAVE_EMSCRIPTEN = 1
HAVE_MENU = 1
HAVE_GFX_WIDGETS = 1
HAVE_RGUI = 1
HAVE_SDL = 0
HAVE_SDL2 = 0
HAVE_ZLIB = 1
HAVE_SHADERPIPELINE = 1
HAVE_STATIC_VIDEO_FILTERS = 1
HAVE_STATIC_AUDIO_FILTERS = 1
HAVE_STB_FONT = 1
HAVE_CONFIGFILE = 1
HAVE_COMMAND = 1
HAVE_STDIN_CMD = 1
HAVE_CHEATS = 1
HAVE_IBXM = 1
HAVE_CORE_INFO_CACHE = 1
HAVE_7ZIP = 1
HAVE_BSV_MOVIE = 1
HAVE_AL = 1

# WARNING -- READ BEFORE ENABLING
# The rwebaudio driver is known to have several audio bugs, such as
#  minor crackling, or the entire page freezing/crashing.
#  It works perfectly on chrome, but even firefox has really bad audio quality.
#  I should also note, the driver on iOS is completely broken (crashes the page).
#  You have been warned.
HAVE_RWEBAUDIO = 0

ASYNC ?= 0
ifeq ($(LIBRETRO), mupen64plus)
   ASYNC = 1
endif

LTO ?= 0
ifeq ($(LIBRETRO), tyrquake)
   LTO = 0
endif

PTHREAD ?= 0

MEMORY ?= 134217728

PRECISE_F32 = 1

OBJDIR := obj-emscripten

#if you compile with SDL2 flag add this Emscripten flag "-s USE_SDL=2" to LDFLAGS:

LIBS    := -s USE_ZLIB=1
LDFLAGS := -L. --no-heap-copy -s $(LIBS) -s TOTAL_MEMORY=$(MEMORY) -s NO_EXIT_RUNTIME=0 -s FULL_ES2=1 \
           -s "EXPORTED_RUNTIME_METHODS=['callMain', 'FS', 'PATH', 'ERRNO_CODES']" \
           -s ALLOW_MEMORY_GROWTH=1 -s "EXPORTED_FUNCTIONS=['_main', '_malloc', '_cmd_savefiles', '_cmd_save_state', '_cmd_load_state', '_cmd_take_screenshot']" \
           -s MODULARIZE=1 -s EXPORT_ES6=1 -s EXPORT_NAME="libretro_$(subst -,_,$(LIBRETRO))" \
           -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=1 \
           --js-library emscripten/library_errno_codes.js \
           --js-library emscripten/library_rwebcam.js

ifeq ($(HAVE_RWEBAUDIO), 1)
   LDFLAGS += --js-library emscripten/library_rwebaudio.js
   DEFINES += -DHAVE_RWEBAUDIO
endif
ifeq ($(HAVE_AL), 1)
   LDFLAGS += -lopenal
   DEFINES += -DHAVE_AL
   ASYNC = 1
endif

ifneq ($(PTHREAD), 0)
   LDFLAGS += -s WASM_MEM_MAX=1073741824 -pthread -s PTHREAD_POOL_SIZE=$(PTHREAD)
   CFLAGS += -pthread
   HAVE_THREADS=1
else
   HAVE_THREADS=0
endif

ifeq ($(ASYNC), 1)
   LDFLAGS += -s ASYNCIFY=$(ASYNC) -s ASYNCIFY_STACK_SIZE=8192 
   ifeq ($(DEBUG), 1)
     LDFLAGS += -s ASYNCIFY_DEBUG=1 # -s ASYNCIFY_ADVISE
   endif
endif

ifeq ($(HAVE_SDL2), 1)
   LIBS += -s USE_SDL=2
   DEFINES += -DHAVE_SDL2
endif

include Makefile.common

CFLAGS += $(DEF_FLAGS) -Ideps -Ideps/stb

libretro :=

ifeq ($(HAVE_STATIC_DUMMY),1)
  DEFINES += -DHAVE_STATIC_DUMMY
else
  libretro += libretro_emscripten.bc
endif

ifneq ($(V), 1)
   Q := @
endif

ifeq ($(DEBUG), 1)
   LDFLAGS += -O0 -g -gsource-map -s SAFE_HEAP=1 -s STACK_OVERFLOW_CHECK=2 -s ASSERTIONS=1
   CFLAGS += -O0 -g -gsource-map -s SAFE_HEAP=1 -s SAFE_HEAP_LOG=1 -s STACK_OVERFLOW_CHECK=2 -s ASSERTIONS=1
else
   LDFLAGS += -O3 -s WASM=1
   # WARNING: some optimizations can break some cores (ex: LTO breaks tyrquake)
   LDFLAGS += -s PRECISE_F32=$(PRECISE_F32)
   ifeq ($(LTO), 1)
      LDFLAGS += --llvm-lto 3
   endif
   CFLAGS += -O3
endif

# 128 * 1024, double the usual emscripten stack size
LDFLAGS += -s STACK_SIZE=131072

LDFLAGS += --extern-pre-js emscripten/pre.js

CFLAGS += -Wall -I. -Ilibretro-common/include -std=gnu99 #\
#          -s EXPORTED_FUNCTIONS="['_main', '_malloc', '_cmd_savefiles', '_cmd_save_state', '_cmd_take_screenshot']"

RARCH_OBJ := $(addprefix $(OBJDIR)/,$(OBJ))

all: $(TARGET)

$(TARGET): $(RARCH_OBJ) $(libretro)
	@$(if $(Q), $(shell echo echo LD $@),)
	$(Q)$(LD) -o $@ $(RARCH_OBJ) $(libretro) $(LIBS) $(LDFLAGS)

$(OBJDIR)/%.o: %.c
	@mkdir -p $(dir $@)
	@$(if $(Q), $(shell echo echo CC $<),)
	$(Q)$(CC) $(CFLAGS) $(DEFINES) $(EOPTS) -c -o $@ $<

$(OBJDIR)/%.o: %.cpp
	@mkdir -p $(dir $@)
	@$(if $(Q), $(shell echo echo CXX $<),)
	$(Q)$(CXX) $(CXXFLAGS) $(DEFINES) $(EOPTS) -c -o $@ $<

clean:
	rm -rf $(OBJDIR)
	rm -f $(TARGET)

.PHONY: all clean