build_opencv_for_esp32.sh

#!/bin/bash

# This script builds the opencv static libraries for the ESP32 and then copies the library and headers files to the asked folder. It must be runned from the opencv repository root.

# USAGE: ./build_opencv_for_esp32.sh <path-to-toolchain> <path-to-project>

set -e

# dir where the script is, no matter from where it is being called from
SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"   

# path to the cmake file containing the toolchain informations
TOOLCHAIN_CMAKE_PATH=$HOME/esp/esp-idf/tools/cmake/toolchain-esp32.cmake

# path where to copy the build libs and headers 
LIB_INSTALL_PATH=$SCRIPTDIR/../lib

# list of modules to compile
OPENCV_MODULES_LIST=core,imgproc,imgcodecs

echo "################################################################################"
echo "######################## build_opencv_for_esp32 script #########################"
echo "################################################################################"

## get script arguments ###
if [ -z "$1" ]
  then
    echo "Using default toolchain cmake file path: ${TOOLCHAIN_CMAKE_PATH}" 
else 
     TOOLCHAIN_CMAKE_PATH=$1
     echo "Using toolchain cmake file path: ${TOOLCHAIN_CMAKE_PATH}"
fi

if [ -z "$2" ]
  then
    echo "Will be installed in default library install path: ${LIB_INSTALL_PATH}/opencv" 
else 
     LIB_INSTALL_PATH=$2
     echo "Will be installed in user-defined library install path: ${LIB_INSTALL_PATH}/opencv"
fi


CMAKE_ARGS="-DCMAKE_BUILD_TYPE=Release -DESP32=ON -DBUILD_SHARED_LIBS=OFF -DCV_DISABLE_OPTIMIZATION=OFF -DWITH_IPP=OFF -DWITH_TBB=OFF -DWITH_OPENMP=OFF -DWITH_PTHREADS_PF=OFF -DWITH_QUIRC=OFF -DWITH_1394=OFF -DWITH_CUDA=OFF -DWITH_OPENCL=OFF -DWITH_OPENCLAMDFFT=OFF -DWITH_OPENCLAMDBLAS=OFF -DWITH_VA_INTEL=OFF -DWITH_EIGEN=OFF -DWITH_GSTREAMER=OFF -DWITH_GTK=OFF -DWITH_JASPER=OFF -DWITH_JPEG=OFF -DWITH_WEBP=OFF -DBUILD_ZLIB=ON -DBUILD_PNG=ON -DWITH_TIFF=OFF -DWITH_V4L=OFF -DWITH_LAPACK=OFF -DWITH_ITT=OFF -DWITH_PROTOBUF=OFF -DWITH_IMGCODEC_HDR=OFF -DWITH_IMGCODEC_SUNRASTER=OFF -DWITH_IMGCODEC_PXM=OFF -DWITH_IMGCODEC_PFM=OFF -DBUILD_LIST=${OPENCV_MODULES_LIST} -DBUILD_JAVA=OFF -DBUILD_opencv_python=OFF -DBUILD_opencv_java=OFF -DBUILD_opencv_apps=OFF -DBUILD_PACKAGE=OFF -DBUILD_PERF_TESTS=OFF -DBUILD_TESTS=OFF -DCV_ENABLE_INTRINSICS=OFF -DCV_TRACE=OFF -DOPENCV_ENABLE_MEMALIGN=OFF -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN_CMAKE_PATH}"


### configure and build opencv ###
cd $SCRIPTDIR/../../
rm -rf build/ && mkdir -p build/ && cd build

# configure with cmake
echo "================================================================================"
echo "Configuring with cmake ${CMAKE_ARGS} :"
echo "================================================================================"
# launch cmake with args and parse list of modules to be build in a variable
OPENCV_MODULES_LIST=`cmake $CMAKE_ARGS .. | tee /dev/tty | grep 'To be built' | cut -f2 -d ':' | xargs | tr ' ' ','`
echo $OPENCV_MODULES_LIST
read -p "Don't forget to check the cmake summary! Continue ? [y/N]"  prompt
if [ "${prompt}" != "y" ] && [ "${prompt}" != "Y" ] && [ "${prompt}" != "yes" ]; then 
    echo "aborted."
	exit 1
fi

# fix of the generated file alloc.c 
cp $SCRIPTDIR/resources/alloc_fix.cpp ./3rdparty/ade/ade-0.1.1f/sources/ade/source/alloc.cpp

# compiling with all power!
echo "================================================================================"
echo "Compiling with make -j"
echo "================================================================================"
make -j3

### installing in output directory ###
echo "================================================================================"
echo "Installing in ${LIB_INSTALL_PATH}"
echo "================================================================================"
# copying opencv modules libs
mkdir -p $LIB_INSTALL_PATH/opencv
cp lib/* $LIB_INSTALL_PATH/opencv

# copying 3rdparty libs
mkdir -p $LIB_INSTALL_PATH/opencv/3rdparty
cp 3rdparty/lib/* $LIB_INSTALL_PATH/opencv/3rdparty

# copying headers
mkdir -p $LIB_INSTALL_PATH/opencv/opencv2
cp opencv2/* $LIB_INSTALL_PATH/opencv/opencv2
cp ../include/opencv2/opencv.hpp $LIB_INSTALL_PATH/opencv/opencv2/


IFS=',' read -r -a modules <<< "$OPENCV_MODULES_LIST"
for elt in "${modules[@]}"
do
    echo "Module ${elt}"
    cp -r "../modules/${elt}/include/opencv2" $LIB_INSTALL_PATH/opencv
done

echo "installation done."