######################################################################
# Common settings and defaults
######################################################################

# Reset flags (DEFINES not reset as used in Makefile)
INCLUDES    :=
OBJS_DEPS   :=
OBJS        :=
DETECT_OBJS :=
$(foreach MODULE,$(MODULES),$(MODULE_OBJS-$(MODULE)) :=)
MODULES     :=

# Defaults
LOAD_RULES_MK     = 1
POSIX             = 1
USE_RGB_COLOR     = 1
ENABLE_VKEYBD     = 1
HAVE_GCC3         = 1
STATIC_LINKING   ?= 0
LITE             ?= 0
NO_WIP           ?= 1
USE_LIBCO        ?= 1
USE_MT32EMU      ?= 1
DEBUG            ?= 0
FORCE_OPENGL     ?= 0
FORCE_OPENGLES2  ?= 0
FORCE_OPENGLNONE ?= 0

DEBUG_ALLOW_DIRTY_SUBMODULES ?= 0

# Variable engines dependencies
UNAVAILABLE_DEPS :=
check_deps_availability = $(shell [ ! $(1) = 1 ] && echo $(2))

# Handle OpenGL flags
ifeq ($(FORCE_OPENGL), 1)
   HAVE_OPENGL := 1
   HAVE_OPENGLES2 :=
endif

ifeq ($(FORCE_OPENGLES2), 1)
   HAVE_OPENGL :=
   HAVE_OPENGLES2 := 1
endif

ifeq ($(FORCE_OPENGLNONE), 1)
   HAVE_OPENGL :=
   HAVE_OPENGLES2 :=
endif

# Features
ifeq ($(or $(HAVE_OPENGL), $(HAVE_OPENGLES2)), 1)
   USE_OPENGL := 1
   USE_OPENGL_GAME := 1
   USE_OPENGL_SHADERS := 1
   DEFINES += -DUSE_OPENGL -DUSE_GLAD -DUSE_OPENGL_GAME -DUSE_OPENGL_SHADERS
ifeq ($(DEBUG), 1)
   DEFINES += -DOPENGL_DEBUG
endif
ifeq ($(HAVE_OPENGL), 1)
   DEFINES += -DHAVE_OPENGL
   $(info Support for OpenGL requested)
else
   DEFINES += -DHAVE_OPENGLES2
   $(info Support for OpenGLES2 requested)
endif
else
   UNAVAILABLE_DEPS += opengl_game_shaders opengl_game_classic
   $(info No support for OpenGL/OpenGLES2 requested)
endif

USE_HIGHRES      ?= 1
ifeq ($(USE_HIGHRES),1)
DEFINES          += -DUSE_HIGHRES
endif
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_HIGHRES), highres)

USE_BINK          = 1
DEFINES          +=  -DUSE_BINK

# Features with baked-in libs (defines handled in dependencies.mk)
USE_FLUIDSYNTH   ?= 1
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_FLUIDSYNTH), fluidsynth)

USE_TREMOR       ?=
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_TREMOR), tremor)

USE_VORBIS       ?= 1
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_VORBIS), vorbis)

USE_FRIBIDI       = 1

USE_ZLIB          = 1

USE_FLAC          = 1

USE_MAD           = 1

USE_FAAD          = 1

USE_PNG           = 1

USE_JPEG          = 1

USE_FREETYPE2     = 1

USE_CLOUD        ?= 0

# Components (defines handled by engines.awk)
USE_THEORADEC    ?= 1
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_THEORADEC), component_theoradec)
# handled in dependencies.mk

USE_HNM          ?= 1
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_HNM), component_hnm)
ifneq ($(USE_HNM),1)
USE_HNM=
else
DEFINES += -DUSE_HNM
endif

USE_ENET         ?= 0
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_ENET), component_enet)
ifneq ($(USE_ENET),1)
USE_ENET=
else
DEFINES += -DUSE_ENET
endif

USE_IMGUI        ?= 1
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_IMGUI), component_imgui)
ifneq ($(USE_IMGUI),1)
USE_IMGUI=
else
DEFINES += -DUSE_IMGUI
endif

USE_MPEG2         ?= 0
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_MPEG2), component_mpeg2)
ifneq ($(USE_MPEG2),1)
USE_MPEG2=
else
DEFINES += -DUSE_MPEG2
endif

USE_GIF         ?= 0
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_GIF), component_gif)
ifneq ($(USE_GIF),1)
USE_GIF=
else
DEFINES += -DUSE_GIF
endif

USE_VPX         ?= 0
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_VPX), component_vpx)
ifneq ($(USE_VPX),1)
USE_VPX=
else
DEFINES += -DUSE_VPX
endif

USE_MPCDEC         ?= 0
UNAVAILABLE_DEPS += $(call check_deps_availability, $(USE_MPCDEC), component_mpcdec)
ifneq ($(USE_MPCDEC),1)
USE_MPCDEC=
else
DEFINES += -DUSE_MPCDEC
endif

USE_TINYGL        = 1
DEFINES += -DUSE_TINYGL

USE_LUA           = 1
DEFINES += -DUSE_LUA

# Paths
SCUMMVM_PATH         := $(ROOT_PATH)/../../..
DEPS_PATH            := $(ROOT_PATH)/deps
CORE_PATH            := $(ROOT_PATH)/src
SCRIPTS_PATH         := $(ROOT_PATH)/scripts
srcdir               := $(SCUMMVM_PATH)
VPATH                := $(SCUMMVM_PATH)
UP_COMMON_MAKE       := $(SCUMMVM_PATH)/Makefile.common
SHARED_MOD_MAKE      := $(ROOT_PATH)/shared_modules.mk

# Core version shown in frontend
GIT_TAG := $(shell cd $(ROOT_PATH) 2>/dev/null && git describe --tags 2>/dev/null)
ifeq ($(GIT_TAG),)
   GIT_HASH := $(shell cd $(ROOT_PATH) 2>/dev/null && git rev-parse --short HEAD 2>/dev/null)
   ifneq ($(GIT_HASH),)
      DEFINES += -DGIT_HASH=\"$(GIT_HASH)\"
   endif
else
   DEFINES += -DGIT_TAG=\"$(GIT_TAG)\"
endif

# Nice name shown in frontend
CORE_NAME = "ScummVM"
# Pipe separated allowed file extensions that core can handle
CORE_EXTENSIONS = "scummvm"
# Subdirs for datafiles bundle
SCUMMVM_SYSTEM_SUBDIR  := scummvm
SCUMMVM_EXTRA_SUBDIR   := extra
SCUMMVM_THEME_SUBDIR   := theme

INCLUDES += -I$(SCUMMVM_PATH)
DEFINES  += -D__LIBRETRO__ -DNONSTANDARD_PORT -DUSE_RGB_COLOR -DUSE_OSD -DUSE_TRANSLATION -DDETECTION_STATIC -DHAVE_CONFIG_H -DENABLE_VKEYBD
DEFINES  += -DCORE_NAME=\"$(CORE_NAME)\" -DCORE_EXTENSIONS=\"$(CORE_EXTENSIONS)\" -DSCUMMVM_SYSTEM_SUBDIR=\"$(SCUMMVM_SYSTEM_SUBDIR)\" -DSCUMMVM_EXTRA_SUBDIR=\"$(SCUMMVM_EXTRA_SUBDIR)\" -DSCUMMVM_THEME_SUBDIR=\"$(SCUMMVM_THEME_SUBDIR)\"
CXXFLAGS += -Wno-long-long -Wno-multichar -Wno-unknown-pragmas -Wno-reorder -Wno-undefined-var-template

ifeq ($(USE_LIBCO), 1)
   DEFINES += -DUSE_LIBCO
else
   LDFLAGS += -lpthread
endif

ifeq ($(TARGET_64BIT), 1)
   DEFINES += -DSIZEOF_SIZE_T=8 -DSCUMM_64BITS
else
   DEFINES += -DSIZEOF_SIZE_T=4
endif

ifeq ($(DEBUG), 1)
   DEFINES += -O0 -g -DLIBRETRO_DEBUG -DDEBUG_BUILD
else
   DEFINES += -DDISABLE_TEXT_CONSOLE -DRELEASE_BUILD
endif

ifeq ($(HAVE_NEON), 1)
   SCUMMVM_NEON := 1
   DEFINES += -DSCUMMVM_NEON
endif

######################################################################
# Libretro settings
######################################################################

INCLUDES     += -I$(ROOT_PATH)/include
MODULE_PATHS += $(CORE_PATH)

LIBRETRO_OBJS := $(CORE_PATH)/libretro-core.o \
	$(CORE_PATH)/libretro-fs.o \
	$(CORE_PATH)/libretro-fs-factory.o \
	$(CORE_PATH)/libretro-os-base.o \
	$(CORE_PATH)/libretro-os-events.o \
	$(CORE_PATH)/libretro-os-inputs.o \
	$(CORE_PATH)/libretro-os-utils.o \
	$(CORE_PATH)/libretro-threads.o \
	$(CORE_PATH)/libretro-timer.o \
	$(CORE_PATH)/libretro-mapper.o \
	$(CORE_PATH)/libretro-options-widget.o \
	$(CORE_PATH)/libretro-graphics-surface.o

ifeq ($(or $(HAVE_OPENGL), $(HAVE_OPENGLES2)), 1)
	LIBRETRO_OBJS += $(CORE_PATH)/libretro-graphics-opengl.o
endif

OBJS += $(LIBRETRO_OBJS)

######################################################################
# External dependencies settings
######################################################################

ifeq (,$(filter datafiles coreinfo,$(MAKECMDGOALS)))
$(info Configuring dependencies...)
include $(ROOT_PATH)/dependencies.mk
endif

######################################################################
# Module settings
######################################################################

INCLUDES    += -I$(SCUMMVM_PATH)/engines -I$(SCUMMVM_PATH)/backends/vkeybd

# Base modules
MODULES := base

# script.mri head
ifeq ($(STATIC_LINKING),1)
   $(shell printf "CREATE $(TARGET)\n" > $(ROOT_PATH)/script.mri)
endif

# Engine modules
# Following script generates configuration engines files (build/config.mk.engines, engines/engines.mk, engines/plugins_table.h, engines/detection_table.h) from actual source in $(SCUMMVM_PATH).
ifneq (,$(filter noengine,$(MAKECMDGOALS)))
   LITE := 2
endif

ifeq (,$(filter clean datafiles coreinfo,$(MAKECMDGOALS)))
$(info Configuring ScummVM engines...)
ifneq ($(shell cd $(SCRIPTS_PATH); ./configure_engines.sh $(ROOT_PATH) $(SCUMMVM_PATH) $(NO_WIP) $(STATIC_LINKING) $(LITE) $(UNAVAILABLE_DEPS)),0)
   $(error Configuring ScummVM engines failed)
else
-include $(SCUMMVM_PATH)/config.mk.engines
-include $(SCUMMVM_PATH)/engines/engines.mk
   $(info - ScummVM engines configured)
endif
endif

ifeq ($(USE_MT32EMU),1)
   INCLUDES    += -I$(SCUMMVM_PATH)/audio/softsynth/mt32/sha1
   DEFINES += -DUSE_MT32EMU
endif

# Retrieve shared modules definitions from main Makefile.common
RETRIEVED_SHARED_MODULES := $(shell cat $(UP_COMMON_MAKE) | tr -s "\n" "\00" | sed -e 's|.*-include engines/engines.mk||' -e 's|\#\#\#.*||' | tr -s "\00" "\n" > $(SHARED_MOD_MAKE) && printf ok || printf error)
ifeq ($(RETRIEVED_SHARED_MODULES), ok)
   include $(SHARED_MOD_MAKE)
else
   $(error Error retrieving shared modules definitions from main Makefile.common)
endif

# script.mri tail
ifeq ($(STATIC_LINKING),1)
   MRI_LIBS := $(shell res=""; for path in $(MODULES) ; do [ ! -z "$$(cat $(SCUMMVM_PATH)/$${path}/module.mk | grep rules.mk)" ] && res="$$res $$path" ; done ; printf "$$res")
   $(shell printf "$(addprefix ADDLIB libtemp/lib, $(addsuffix .a\n,$(notdir $(MRI_LIBS))))" >> $(ROOT_PATH)/script.mri)
   $(shell printf "ADDLIB libtemp/libdeps.a\n" >> $(ROOT_PATH)/script.mri)
   $(shell printf "ADDLIB libtemp/libdetect.a\n" >> $(ROOT_PATH)/script.mri)
   $(shell printf "$(addprefix ADDMOD libtemp/, $(addsuffix \n,$(notdir $(LIBRETRO_OBJS))))" >> $(ROOT_PATH)/script.mri)
   $(shell printf "SAVE\n" >> $(ROOT_PATH)/script.mri)
   $(shell printf "END\n" >> $(ROOT_PATH)/script.mri)
   $(shell sed -i.bak -e "s/^ //g" $(ROOT_PATH)/script.mri;rm -f $(ROOT_PATH)/script.mri.bak)
endif

######################################################################
# Rules
######################################################################

core: $(TARGET)

noengine: $(TARGET)

datafiles: scummvm.zip

coreinfo: $(TARGET_NAME)_libretro.info

all: $(TARGET) scummvm.zip $(TARGET_NAME)_libretro.info

#bundle_files
scummvm.zip: $(SCUMMVM_PATH)/dists/scummvm.rc
	@echo Preparing $@
ifeq (, $(shell which zip))
	$(error "No zip found, consider doing apt-get install zip")
endif
	@$(SCRIPTS_PATH)/bundle_datafiles.sh $(ROOT_PATH) $(SCUMMVM_PATH) bundle $(TARGET_NAME)

$(TARGET_NAME)_libretro.info: $(SCUMMVM_PATH)/dists/scummvm.rc
	@echo Preparing $@
	@$(SCRIPTS_PATH)/bundle_datafiles.sh $(ROOT_PATH) $(SCUMMVM_PATH) info $(TARGET_NAME) $(CORE_NAME) $(CORE_EXTENSIONS) $(SCUMMVM_SYSTEM_SUBDIR) $(SCUMMVM_EXTRA_SUBDIR) $(SCUMMVM_THEME_SUBDIR)

.PHONY: all core datafiles coreinfo