cocos2d 跨平台原理以及android.mk编译的入口

在android工程下面jni/hellocpp/main.cpp里面是cocos2d c++的入口。

一路跟踪Cocos2dxActivity.java找到Cocos2dxRenderer.java

public void onSurfaceCreated(final GL10 pGL10, final EGLConfig pEGLConfig) {
        Cocos2dxRenderer.nativeInit(this.mScreenWidth, this.mScreenHeight);
        this.mLastTickInNanoSeconds = System.nanoTime();
        mNativeInitCompleted = true;
    }

调用native方法nativeInit创建glView。

其中nativeInit方法在cocos/platform/android/javaactivity-android.cpp可以看到

java层是怎么能够找的到javaactivity-android.cpp这个文件呢？

在obj目录下可以看到javaactivity-android.o文件

但是这个文件在什么时候在哪里编译的呢？

右键工程可以看到会执行目录下的build_native.py

在build_native.py里面可以看到一段函数

def do_build(cocos_root, ndk_root, app_android_root,ndk_build_param,sdk_root,android_platform,build_mode):

    ndk_path = os.path.join(ndk_root, "ndk-build")

    num_of_cpu = get_num_of_cpu()
	
    if ndk_build_param == None:
        command = '%s -j%d -C %s NDK_DEBUG=%d' % (ndk_path, num_of_cpu, app_android_root, build_mode=='debug')
    else:
        command = '%s -j%d -C %s NDK_DEBUG=%d %s' % (ndk_path, num_of_cpu, app_android_root, build_mode=='debug', ' '.join(str(e) for e in ndk_build_param))
    if os.system(command) != 0:
        raise Exception("Build dynamic library for project [ " + app_android_root + " ] fails!")
    elif android_platform is not None:
    	  sdk_tool_path = os.path.join(sdk_root, "tools/android")
    	  cocoslib_path = os.path.join(cocos_root, "cocos/platform/android/java")
    	  command = '%s update lib-project -t %s -p %s' % (sdk_tool_path,android_platform,cocoslib_path) 
    	  if os.system(command) != 0:
    	  	  raise Exception("update cocos lib-project [ " + cocoslib_path + " ] fails!")  	  
    	  command = '%s update project -t %s -p %s -s' % (sdk_tool_path,android_platform,app_android_root)
    	  if os.system(command) != 0:
    	  	  raise Exception("update project [ " + app_android_root + " ] fails!")    	  	  
    	  buildfile_path = os.path.join(app_android_root, "build.xml")
    	  command = 'ant clean %s -f %s -Dsdk.dir=%s' % (build_mode,buildfile_path,sdk_root)
    	  os.system(command)

打印执行的命令可以看到

xx\android-ndk-r10c\ndk-build -j4 -C xx\Projects\cake\proj.android NDK_DEBUG=0

ndk-build 其实就是对GNU Make的封装，它的目的是调用正确的NDK编译脚本，它等价于 make -f $NDK/build/core/build-local.mk [参数]
打开 build-local.mk

可以看到关于jni目录下的application.mk和android.mk信息。

可见这就是编译C++文件的入口。

再看android.mk

其中$(call import-module,.)会引入上面add-path下的外部android.mk文件

可以看到cocos目录下有个android.mk文件

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := cocos2dx_internal_static

LOCAL_MODULE_FILENAME := libcocos2dxinternal

LOCAL_SRC_FILES := \
cocos2d.cpp \
2d/CCAction.cpp \
2d/CCActionCamera.cpp \
2d/CCActionCatmullRom.cpp \
2d/CCActionEase.cpp \
2d/CCActionGrid.cpp \
2d/CCActionGrid3D.cpp \
2d/CCActionInstant.cpp \
2d/CCActionInterval.cpp \
2d/CCActionManager.cpp \
2d/CCActionPageTurn3D.cpp \
2d/CCActionProgressTimer.cpp \
2d/CCActionTiledGrid.cpp \
2d/CCActionTween.cpp \
2d/CCAnimation.cpp \
2d/CCAnimationCache.cpp \
2d/CCAtlasNode.cpp \
2d/CCCamera.cpp \
2d/CCClippingNode.cpp \
2d/CCClippingRectangleNode.cpp \
2d/CCComponent.cpp \
2d/CCComponentContainer.cpp \
2d/CCDrawNode.cpp \
2d/CCDrawingPrimitives.cpp \
2d/CCFont.cpp \
2d/CCFontAtlas.cpp \
2d/CCFontAtlasCache.cpp \
2d/CCFontCharMap.cpp \
2d/CCFontFNT.cpp \
2d/CCFontFreeType.cpp \
2d/CCGLBufferedNode.cpp \
2d/CCGrabber.cpp \
2d/CCGrid.cpp \
2d/CCLabel.cpp \
2d/CCLabelAtlas.cpp \
2d/CCLabelBMFont.cpp \
2d/CCLabelTTF.cpp \
2d/CCLabelTextFormatter.cpp \
2d/CCLayer.cpp \
2d/CCLight.cpp \
2d/CCMenu.cpp \
2d/CCMenuItem.cpp \
2d/CCMotionStreak.cpp \
2d/CCNode.cpp \
2d/CCNodeGrid.cpp \
2d/CCParallaxNode.cpp \
2d/CCParticleBatchNode.cpp \
2d/CCParticleExamples.cpp \
2d/CCParticleSystem.cpp \
2d/CCParticleSystemQuad.cpp \
2d/CCProgressTimer.cpp \
2d/CCProtectedNode.cpp \
2d/CCRenderTexture.cpp \
2d/CCScene.cpp \
2d/CCSprite.cpp \
2d/CCSpriteBatchNode.cpp \
2d/CCSpriteFrame.cpp \
2d/CCSpriteFrameCache.cpp \
2d/CCTMXLayer.cpp \
2d/CCFastTMXLayer.cpp \
2d/CCTMXObjectGroup.cpp \
2d/CCTMXTiledMap.cpp \
2d/CCFastTMXTiledMap.cpp \
2d/CCTMXXMLParser.cpp \
2d/CCTextFieldTTF.cpp \
2d/CCTileMapAtlas.cpp \
2d/CCTransition.cpp \
2d/CCTransitionPageTurn.cpp \
2d/CCTransitionProgress.cpp \
2d/CCTweenFunction.cpp \
platform/CCGLView.cpp \
platform/CCFileUtils.cpp \
platform/CCSAXParser.cpp \
platform/CCThread.cpp \
platform/CCImage.cpp \
math/CCAffineTransform.cpp \
math/CCGeometry.cpp \
math/CCVertex.cpp \
math/Mat4.cpp \
math/MathUtil.cpp \
math/Quaternion.cpp \
math/TransformUtils.cpp \
math/Vec2.cpp \
math/Vec3.cpp \
math/Vec4.cpp \
base/CCAutoreleasePool.cpp \
base/CCConfiguration.cpp \
base/CCConsole.cpp \
base/CCData.cpp \
base/CCDataVisitor.cpp \
base/CCDirector.cpp \
base/CCEvent.cpp \
base/CCEventAcceleration.cpp \
base/CCEventCustom.cpp \
base/CCEventDispatcher.cpp \
base/CCEventFocus.cpp \
base/CCEventKeyboard.cpp \
base/CCEventController.cpp \
base/CCEventListener.cpp \
base/CCEventListenerController.cpp \
base/CCEventListenerAcceleration.cpp \
base/CCEventListenerCustom.cpp \
base/CCEventListenerFocus.cpp \
base/CCEventListenerKeyboard.cpp \
base/CCEventListenerMouse.cpp \
base/CCEventListenerTouch.cpp \
base/CCEventMouse.cpp \
base/CCEventTouch.cpp \
base/CCIMEDispatcher.cpp \
base/CCNS.cpp \
base/CCProfiling.cpp \
base/ccRandom.cpp \
base/CCRef.cpp \
base/CCScheduler.cpp \
base/CCScriptSupport.cpp \
base/CCTouch.cpp \
base/CCUserDefault.cpp \
base/CCUserDefault-android.cpp \
base/CCValue.cpp \
base/TGAlib.cpp \
base/ZipUtils.cpp \
base/atitc.cpp \
base/base64.cpp \
base/ccCArray.cpp \
base/ccFPSImages.c \
base/ccTypes.cpp \
base/ccUTF8.cpp \
base/ccUtils.cpp \
base/etc1.cpp \
base/pvr.cpp \
base/s3tc.cpp \
base/CCController.cpp \
base/CCController-android.cpp \
base/ObjectFactory.cpp \
renderer/CCBatchCommand.cpp \
renderer/CCCustomCommand.cpp \
renderer/CCGLProgram.cpp \
renderer/CCGLProgramCache.cpp \
renderer/CCGLProgramState.cpp \
renderer/CCGLProgramStateCache.cpp \
renderer/CCGroupCommand.cpp \
renderer/CCQuadCommand.cpp \
renderer/CCMeshCommand.cpp \
renderer/CCRenderCommand.cpp \
renderer/CCRenderer.cpp \
renderer/CCTexture2D.cpp \
renderer/CCTextureAtlas.cpp \
renderer/CCTextureCache.cpp \
renderer/ccGLStateCache.cpp \
renderer/ccShaders.cpp \
renderer/CCVertexIndexBuffer.cpp \
renderer/CCVertexIndexData.cpp \
renderer/CCPrimitive.cpp \
renderer/CCPrimitiveCommand.cpp \
renderer/CCTrianglesCommand.cpp \
deprecated/CCArray.cpp \
deprecated/CCSet.cpp \
deprecated/CCString.cpp \
deprecated/CCDictionary.cpp \
deprecated/CCDeprecated.cpp \
deprecated/CCNotificationCenter.cpp \
physics/CCPhysicsBody.cpp \
physics/CCPhysicsContact.cpp \
physics/CCPhysicsJoint.cpp \
physics/CCPhysicsShape.cpp \
physics/CCPhysicsWorld.cpp \
physics/chipmunk/CCPhysicsBodyInfo_chipmunk.cpp \
physics/chipmunk/CCPhysicsContactInfo_chipmunk.cpp \
physics/chipmunk/CCPhysicsJointInfo_chipmunk.cpp \
physics/chipmunk/CCPhysicsShapeInfo_chipmunk.cpp \
physics/chipmunk/CCPhysicsWorldInfo_chipmunk.cpp \
../external/ConvertUTF/ConvertUTFWrapper.cpp \
../external/ConvertUTF/ConvertUTF.c \
../external/tinyxml2/tinyxml2.cpp \
../external/unzip/ioapi_mem.cpp \
../external/unzip/ioapi.cpp \
../external/unzip/unzip.cpp \
../external/edtaa3func/edtaa3func.cpp \
../external/xxhash/xxhash.c


LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) \
                    $(LOCAL_PATH)/. \
                    $(LOCAL_PATH)/.. \
                    $(LOCAL_PATH)/platform \
                    $(LOCAL_PATH)/base \
                    $(LOCAL_PATH)/../external \
                    $(LOCAL_PATH)/../external/tinyxml2 \
                    $(LOCAL_PATH)/../external/unzip \
                    $(LOCAL_PATH)/../external/chipmunk/include/chipmunk \
                    $(LOCAL_PATH)/../external/xxhash \
                    $(LOCAL_PATH)/../external/nslog

LOCAL_C_INCLUDES := $(LOCAL_PATH) \
                    $(LOCAL_PATH)/. \
                    $(LOCAL_PATH)/platform \
                    $(LOCAL_PATH)/../external \
                    $(LOCAL_PATH)/../external/tinyxml2 \
                    $(LOCAL_PATH)/../external/unzip \
                    $(LOCAL_PATH)/../external/chipmunk/include/chipmunk \
                    $(LOCAL_PATH)/../external/edtaa3func \
                    $(LOCAL_PATH)/../external/xxhash \
                    $(LOCAL_PATH)/../external/ConvertUTF \
                    $(LOCAL_PATH)/../external/nslog

LOCAL_EXPORT_LDLIBS := -lGLESv2 \
                       -llog \
                       -lz \
                       -landroid

LOCAL_STATIC_LIBRARIES := cocos_freetype2_static
LOCAL_STATIC_LIBRARIES += cocos_png_static
LOCAL_STATIC_LIBRARIES += cocos_jpeg_static
LOCAL_STATIC_LIBRARIES += cocos_tiff_static
LOCAL_STATIC_LIBRARIES += cocos_webp_static
LOCAL_STATIC_LIBRARIES += cocos_chipmunk_static

LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dxandroid_static

# define the macro to compile through support/zip_support/ioapi.c
LOCAL_CFLAGS   :=  -DUSE_FILE32API
LOCAL_CPPFLAGS := -Wno-deprecated-declarations -Wno-extern-c-compat
LOCAL_EXPORT_CFLAGS   := -DUSE_FILE32API
LOCAL_EXPORT_CPPFLAGS := -Wno-deprecated-declarations -Wno-extern-c-compat

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
LOCAL_ARM_NEON  := true
endif

include $(BUILD_STATIC_LIBRARY)

#==============================================================

include $(CLEAR_VARS)

LOCAL_MODULE := cocos2dx_static
LOCAL_MODULE_FILENAME := libcocos2d

LOCAL_STATIC_LIBRARIES := cocostudio_static
LOCAL_STATIC_LIBRARIES += cocosbuilder_static
LOCAL_STATIC_LIBRARIES += cocos3d_static
LOCAL_STATIC_LIBRARIES += spine_static
LOCAL_STATIC_LIBRARIES += cocos_network_static
LOCAL_STATIC_LIBRARIES += audioengine_static

include $(BUILD_STATIC_LIBRARY)
#==============================================================
$(call import-module,freetype2/prebuilt/android)
$(call import-module,platform/android)
$(call import-module,png/prebuilt/android)
$(call import-module,jpeg/prebuilt/android)
$(call import-module,tiff/prebuilt/android)
$(call import-module,webp/prebuilt/android)
$(call import-module,chipmunk/prebuilt/android)
$(call import-module,3d)
$(call import-module,audio/android)
$(call import-module,editor-support/cocosbuilder)
$(call import-module,editor-support/cocostudio)
$(call import-module,editor-support/spine)
$(call import-module,network)
$(call import-module,ui)
$(call import-module,extensions)
$(call import-module,Box2D)
$(call import-module,curl/prebuilt/android)
$(call import-module,websockets/prebuilt/android)
$(call import-module,protobuf-lite)

$(call import-module,audio/android)

这个下面也有android.mk文件javaactivity-android.o就是在这里编译的。

到这里一切就豁然开朗了。

参考链接:
http://blog.sina.com.cn/s/blog_4057ab62010197z8.html
http://blog.csdn.net/smfwuxiao/article/details/8523087

cocos2d 跨平台原理 以及android.mk编译的入口

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