##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
## Created by: Hang Zhang
## ECE Department, Rutgers University
## Email: zhang.hang@rutgers.edu
## Copyright (c) 2017
##
## This source code is licensed under the MIT-style license found in the
## LICENSE file in the root directory of this source tree 
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
CMAKE_POLICY(VERSION 2.8)

OPTION(NDEBUG "disable asserts (WARNING: this may result in silent UB e.g. with out-of-bound indices)")
IF(NOT NDEBUG)
  MESSAGE(STATUS "Removing -DNDEBUG from compile flags")
  STRING(REPLACE "-DNDEBUG" "" CMAKE_C_FLAGS "" ${CMAKE_C_FLAGS})
  STRING(REPLACE "-DNDEBUG" "" CMAKE_C_FLAGS_DEBUG "" ${CMAKE_C_FLAGS_DEBUG})
  STRING(REPLACE "-DNDEBUG" "" CMAKE_C_FLAGS_RELEASE "" ${CMAKE_C_FLAGS_RELEASE})
  STRING(REPLACE "-DNDEBUG" "" CMAKE_CXX_FLAGS "" ${CMAKE_CXX_FLAGS})
  STRING(REPLACE "-DNDEBUG" "" CMAKE_CXX_FLAGS_DEBUG "" ${CMAKE_CXX_FLAGS_DEBUG})
  STRING(REPLACE "-DNDEBUG" "" CMAKE_CXX_FLAGS_RELEASE "" ${CMAKE_CXX_FLAGS_RELEASE})
ENDIF()

INCLUDE(${CMAKE_CURRENT_SOURCE_DIR}/cmake/FindTorch.cmake)

#IF(NOT Torch_FOUND)
#  FIND_PACKAGE(Torch REQUIRED)
#ENDIF()

IF(NOT CUDA_FOUND)
  FIND_PACKAGE(CUDA 6.5 REQUIRED)
ENDIF()

# Detect CUDA architecture and get best NVCC flags
IF(NOT COMMAND CUDA_SELECT_NVCC_ARCH_FLAGS OR MSVC)
  INCLUDE(${CMAKE_CURRENT_SOURCE_DIR}/cmake/select_compute_arch.cmake)
ENDIF()
LIST(APPEND CUDA_NVCC_FLAGS $ENV{TORCH_NVCC_FLAGS})
CUDA_SELECT_NVCC_ARCH_FLAGS(NVCC_FLAGS_EXTRA $ENV{TORCH_CUDA_ARCH_LIST})
LIST(APPEND CUDA_NVCC_FLAGS ${NVCC_FLAGS_EXTRA})

if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "4.9.3")
    if(CUDA_VERSION VERSION_LESS "8.0")
      MESSAGE(STATUS "Found gcc >=5 and CUDA <= 7.5, adding workaround C++ flags")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_FORCE_INLINES -D_MWAITXINTRIN_H_INCLUDED -D__STRICT_ANSI__")
    endif(CUDA_VERSION VERSION_LESS "8.0")
  endif(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "4.9.3")
endif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")

IF(MSVC)
  LIST(APPEND CUDA_NVCC_FLAGS "-Xcompiler /wd4819")
  ADD_DEFINITIONS(-DTH_EXPORTS)
ENDIF()

IF(NOT ENCODING_INSTALL_LIB_SUBDIR)
  SET(ENCODING_INSTALL_LIB_SUBDIR "${TORCH_BUILD_DIR}" CACHE PATH "ENCODING install library directory")
  SET(ENCODING_INSTALL_INCLUDE_SUBDIR "${TORCH_BUILD_DIR}/include" CACHE PATH "ENCODING install include subdirectory")
ENDIF()

SET(CMAKE_MACOSX_RPATH 1)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

FILE(GLOB src-cuda kernel/*.cu)

CUDA_INCLUDE_DIRECTORIES(
	${CMAKE_CURRENT_SOURCE_DIR}
	${Torch_INSTALL_INCLUDE} 
)
CUDA_ADD_LIBRARY(ENCODING SHARED ${src-cuda})

IF(MSVC)
  SET_TARGET_PROPERTIES(ENCODING PROPERTIES PREFIX "lib" IMPORT_PREFIX "lib")
ENDIF()

INCLUDE_DIRECTORIES(
	./include
	${CMAKE_CURRENT_SOURCE_DIR} 
	${Torch_INSTALL_INCLUDE} 
)
TARGET_LINK_LIBRARIES(ENCODING 
	${THC_LIBRARIES} 
	${TH_LIBRARIES} 
	${CUDA_cusparse_LIBRARY}
)

# Luarocks bug pre-14.04 prevents us from setting it for Lua-Torch
IF(ENCODING_SO_VERSION)
  MESSAGE(STATUS "ENCODING_SO_VERSION: ${ENCODING_SO_VERSION}")
  SET_TARGET_PROPERTIES(ENCODING PROPERTIES
    VERSION   ${ENCODING_SO_VERSION}
    SOVERSION ${ENCODING_SO_VERSION})
ENDIF(ENCODING_SO_VERSION)

INSTALL(TARGETS ENCODING LIBRARY DESTINATION ${ENCODING_INSTALL_LIB_SUBDIR})
INSTALL(FILES kernel/thc_encoding.h DESTINATION "${ENCODING_INSTALL_INCLUDE_SUBDIR}/ENCODING")
INSTALL(FILES kernel/generic/encoding_kernel.h DESTINATION "${ENCODING_INSTALL_INCLUDE_SUBDIR}/ENCODING/generic")