uname_P ?= $(shell sh -c 'uname -p 2>/dev/null || echo not')

CXX ?= g++
ISPC ?= ISPC/linux/ispc
CXXFLAGS ?= -O2 $(ARCH_CXXFLAGS) -fPIC -I.
ISPC_FLAGS ?= -O2 --arch=$(ISPC_ARCH) --target=$(ISPC_TARGETS) --opt=fast-math --pic
LDFLAGS ?= -shared -rdynamic

ifeq ($(uname_P),amd64)
ISPC_ARCH ?= x86-64
ISPC_TARGETS ?= sse2,avx
ISPC_OBJS ?= sse2 avx
ARCH_CXXFLAGS ?= -msse2
endif
ifeq ($(uname_P),x86_64)
ISPC_ARCH ?= x86-64
ISPC_TARGETS ?= sse2,avx
ISPC_OBJS ?= sse2 avx
ARCH_CXXFLAGS ?= -msse2
endif
ifeq ($(uname_P),arm64)
ISPC_ARCH ?= aarch64
ISPC_TARGETS ?= neon-i32x4
endif
ifeq ($(uname_P),aarch64)
ISPC_ARCH ?= aarch64
ISPC_TARGETS ?= neon-i32x4
endif

DYNAMIC_LIBRARY = build/libispc_texcomp.so
OBJS = ispc_texcomp/kernel_astc_ispc.o \
$(foreach target,$(ISPC_OBJS),ispc_texcomp/kernel_astc_ispc_$(target).o ) \
ispc_texcomp/kernel_ispc.o \
$(foreach target,$(ISPC_OBJS),ispc_texcomp/kernel_ispc_$(target).o ) \
ispc_texcomp/ispc_texcomp_astc.o \
ispc_texcomp/ispc_texcomp.o

all: $(DYNAMIC_LIBRARY)

clean:
	rm -f $(DYNAMIC_LIBRARY) $(OBJS) ispc_texcomp/kernel*ispc*.h

# Force ispc targets to run before compiling the cpp that relies on their generated headers
ispc_texcomp/ispc_texcomp.cpp : ispc_texcomp/kernel_ispc.o
ispc_texcomp/ispc_texcomp_astc.cpp : ispc_texcomp/kernel_astc_ispc.o

# Simple "generate .o from .cpp using c++ compiler"
%.o : %.cpp
	$(CXX) $(CXXFLAGS) -c $< -o $@

# Generate .o and .h +variants using ispc
%_ispc.o %_ispc_sse2.o %_ispc_avx.o %_ispc_neon.o %_ispc.h %_ispc_sse2.h %_ispc_avx.h %_ispc_neon.h : %.ispc
	$(ISPC) $(ISPC_FLAGS) -o $@ -h $(patsubst %.o,%.h,$@) $<

# Link
$(DYNAMIC_LIBRARY) : $(OBJS)
	mkdir -p build
	$(CXX) $(LDFLAGS) -o $@ $^