Compilling Ogre SDK for iOS

经过一天的努力终于成功编译ogre 的ios版本，具体过程和注意事项纪录如下：

主要步骤：

1. 下载ogre for iOS source code， ogre xcode template, ogre 依赖库；

2. 编译

3. 安装ogre xcode template

4. 从模板创建ogre 工程，真机，模拟器运行测试

5. 完成

具体细节：

1. 下载ogre for iOS source code， ogre xcode template, ogre 依赖库；

    到ogre 官网下载最新源代码，包括 ogre 源代码 和 ios 预编译依赖包(ios precompiled dependencies)；

    下载ogre xcode template

    这里需要注意，template直接在1.8.2上貌似不能成功安装，我的方法是在低版本系统安装好后把template目录考到当前系统上（/Library/Developer/Xcode/Templates/Ogre）

2. 编译

    首先解压源码，然后把依赖包解压到源码根目录下；

    根目录下执行以下脚本（官方的脚本貌似不能工作，所以做了一些修改）：

#! /bin/bash
 
#############
# CONSTANTS #
################################################################################
 
# Absolute path to the source code directory.
SRC=`pwd`/
 
# Absolute path to the build directory.
BUILD=`pwd`/build/iOS
 
# The build configuration. Recommended values are:
#   Release        - optimized code that excludes debugging information.
#   RelWithDebInfo - optimized code that includes debugging information.
CONFIG=Release
 
################################################################################
 
# Clear the old build and recompile the new one.
rm -rf $BUILD
mkdir -p $BUILD
cd $BUILD
cmake -D OGRE_BUILD_PLATFORM_APPLE_IOS=1 -G Xcode $SRC
cd $BUILD
xcodebuild -sdk iphoneos -configuration $CONFIG ONLY_ACTIVE_ARCH=NO
mkdir -p $BUILD/lib/Release-iphoneos
mv $BUILD/lib/Release/* $BUILD/lib/Release-iphoneos
xcodebuild -sdk iphonesimulator -configuration $CONFIG ARCHS=i386 ONLY_ACTIVE_ARCH=YES
mkdir -p $BUILD/lib/Release-iphonesimulator
mv $BUILD/lib/Release/* $BUILD/lib/Release-iphonesimulator
for FILE in `ls $BUILD/lib/Release-iphoneos`
do
  lipo $BUILD/lib/Release-iphoneos/$FILE \
    -arch i386 $BUILD/lib/Release-iphonesimulator/$FILE \
    -create -output $BUILD/lib/Release/$FILE
done
rm -rf $BUILD/lib/Release-iphoneos
rm -rf $BUILD/lib/Release-iphonesimulator
 
# Copy the dependencies.
cp -R $SRC/iOSDependencies $BUILD
ln -s $BUILD/iOSDependencies/include/OIS $BUILD/include/OIS
rm -rf $BUILD/iOSDependencies/lib/Debug
 
# Add necessary files to the lib directory.
mv $BUILD/pkgconfig $BUILD/lib
 
# Remove samples, which are not useful as libraries.
rm $BUILD/lib/Release/*Sample*
 
# Add necessary files to the include directory.
mkdir -p $BUILD/include/OGRE
mkdir -p $BUILD/include/OGRE/iOS
mkdir -p $BUILD/include/OGRE/Paging
mkdir -p $BUILD/include/OGRE/Plugins
mkdir -p $BUILD/include/OGRE/Plugins/BSPSceneManager
mkdir -p $BUILD/include/OGRE/Plugins/OctreeSceneManager
mkdir -p $BUILD/include/OGRE/Plugins/OctreeZone
mkdir -p $BUILD/include/OGRE/Plugins/ParticleFX
mkdir -p $BUILD/include/OGRE/Plugins/PCZSceneManager
mkdir -p $BUILD/include/OGRE/Property
mkdir -p $BUILD/include/OGRE/RenderSystems
mkdir -p $BUILD/include/OGRE/RenderSystems/GLES
mkdir -p $BUILD/include/OGRE/RenderSystems/GLES/EAGL
mkdir -p $BUILD/include/OGRE/RenderSystems/GLES2
mkdir -p $BUILD/include/OGRE/RenderSystems/GLES2/EAGL
mkdir -p $BUILD/include/OGRE/RTShaderSystem
mkdir -p $BUILD/include/OGRE/Terrain
mkdir -p $BUILD/include/OGRE/Threading
mv $BUILD/include/OgreBuildSettings.h $BUILD/include/OGRE
cp $SRC/OgreMain/include/*.h $BUILD/include/OGRE
cp $SRC/Samples/Common/include/* $BUILD/include/OGRE
cp $SRC/OgreMain/include/iOS/* $BUILD/include/OGRE/iOS
cp $SRC/Components/Paging/include/* $BUILD/include/OGRE/Paging
cp $SRC/Plugins/BSPSceneManager/include/* $BUILD/include/OGRE/Plugins/BSPSceneManager
cp $SRC/Plugins/OctreeSceneManager/include/* $BUILD/include/OGRE/Plugins/OctreeSceneManager
cp $SRC/Plugins/OctreeZone/include/* $BUILD/include/OGRE/Plugins/OctreeZone
cp $SRC/Plugins/ParticleFX/include/* $BUILD/include/OGRE/Plugins/ParticleFX
cp $SRC/Plugins/PCZSceneManager/include/* $BUILD/include/OGRE/Plugins/PCZSceneManager
cp $SRC/Components/Property/include/* $BUILD/include/OGRE/Property
cp $SRC/RenderSystems/GLES/include/*.h $BUILD/include/OGRE/RenderSystems/GLES
cp $SRC/RenderSystems/GLES/include/EAGL/* $BUILD/include/OGRE/RenderSystems/GLES/EAGL
cp $SRC/RenderSystems/GLES2/include/*.h $BUILD/include/OGRE/RenderSystems/GLES2
cp $SRC/RenderSystems/GLES2/include/EAGL/* $BUILD/include/OGRE/RenderSystems/GLES2/EAGL
cp $SRC/Components/RTShaderSystem/include/* $BUILD/include/OGRE/RTShaderSystem
cp $SRC/Components/Terrain/include/* $BUILD/include/OGRE/Terrain
cp $SRC/OgreMain/include/Threading/* $BUILD/include/OGRE/Threading
 
# Remove everything except headers and libraries.
for FILE in `ls $BUILD`
do
  if [ $FILE != "include" ] &&
     [ $FILE != "iOSDependencies" ] &&
     [ $FILE != "lib" ]
  then
    rm -rf $FILE
  fi
done

注意最后应该有两个SUCCESS提示；

3. 安装ogre xcode template

4. 从模板创建ogre 工程，真机，模拟器运行测试

    从模板创建ogre工程会提示制定ogre sdk路径，请填写上一步的$BUILD，这里有个问题，创建好的工程会编译不过，提示找不到ogrecamera.h文件。

    此时需要修改工程中header 和 library 的搜索路径，在最前面加一个/，如果把ogre sdk 放在工程的目录下，那么也可以指定相对路径；

    还有一个地方需要注意的是，上一步修改后编译通过，链接会报错，提示boost::system::xxx错误，解决方法是在链接选项里面加上-lboost_system

    这样就ok了

5. 完成

touch4 运行结果， 效果还是很赞的～