CXX ?= g++
ISPC ?= ./ispc_linux
CXXFLAGS ?= -O2 -msse2 -fPIC -I.
ISPC_FLAGS ?= -O2 --arch=x86-64 --target=sse2,avx --opt=fast-math --pic
LDFLAGS ?= -shared -rdynamic

DYNAMIC_LIBRARY = build/libispc_texcomp.so
OBJS = ispc_texcomp/kernel_astc_ispc.o \
ispc_texcomp/kernel_astc_ispc_sse2.o \
ispc_texcomp/kernel_astc_ispc_avx.o \
ispc_texcomp/kernel_etc_ispc.o \
ispc_texcomp/kernel_etc_ispc_sse2.o \
ispc_texcomp/kernel_etc_ispc_avx.o \
ispc_texcomp/kernel_bptc_ispc.o \
ispc_texcomp/kernel_bptc_ispc_sse2.o \
ispc_texcomp/kernel_bptc_ispc_avx.o \
ispc_texcomp/kernel_ispc.o \
ispc_texcomp/kernel_ispc_sse2.o \
ispc_texcomp/kernel_ispc_avx.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/kernel_etc_ispc.o ispc_texcomp/kernel_bptc_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.h %_ispc_sse2.h %_ispc_avx.h : %.ispc
	$(ISPC) $(ISPC_FLAGS) -o $@ -h $(patsubst %.o,%.h,$@) $<

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