* remove deprecated files
* remove some deprecated codes
* remove more deprecated codes
* remove ui deprecated codes
* remove more deprecated codes
* remove deprecated codes in ccmenuitem
* remove more deprecated codes in ui
* remove more deprecated codes in ui
* remove more deprecated codes in ui
* remove more deprecated codes
* remove more deprecated codes
* remove more deprecated codes
* remove vr related codes and ignore some modules
* remove allocator
* remove some config
* 【Feature】add back-end project file
* [Feature] add back-end file
* add pipeline descriptor and shader cache
* [Feature] support sprite for backend
* [Feature] remove unneeded code
* [Feature] according to es2.0 spec, you must use clamp-to-edge as texture wrap mode, and no mipmapping for non-power-of-two texture
* [Feature] set texture wrap mode to clamp-to-edge, and no mipmapping for non-power-of-two texture
* [Feature] remove macro define to .cpp file
* [Feature] add log info
* [Feature] add PipelineDescriptor for TriangleCommand
* [Feature] add PipelineDescriptor object as member of TriangleCommand
* [Feature] add getPipelineDescriptor method
* add renderbackend
* complete pipeline descriptor
* [Feature] add viewport in RenderCommand
* set viewport when rendrering
* [Feature] occur error when using RendererBackend, to be fixed.
* a workaround to fix black screen on macOS 10.14 (#19090)
* add rendererbackend init function
* fix typo
* [Feature] modify testFile
* [BugFix] modify shader path
* [Feature] set default viewport
* fix projection
* [Feature] modify log info
* [BugFix] change viewport data type to int
* [BugFix] add BindGroup to PipelienDescriptor
* [BugFix] change a_position to vec3 in sprite.vert
* [BugFix] set vertexLayout according to V3F_C4B_T2F structure
* [Feature] revert a_position to vec4
* [Feature] renderer should not use gl codes directly
* [Feature] it's better not use default value parameter
* fix depth test setting
* rendererbackend -> renderer
* clear color and depth at begin
* add metal backend
* metal support normalized attribute
* simplify codes
* update external
* add render pass desctriptor in pipeline descriptor
* fix warnings
* fix crash and memeory leak
* refactor Texture2D
* put pipeline descriptor into render command
* simplify codes
* [Feature] update Sprite
* fix crash when closing app
* [Feature] update SpriteBatchNode and TextureAtlas
* support render texture(not finish)
* [Feature] remove unused code
* make tests work on mac
* fix download-deps path error
* make tests work on iOS
* [Feature] support ttf under normal label effect
* refactor triangle command processing
* let renderer handle more common commands
* refactor backend
* make render texture work
* [Feature] refactor backend for GL
* [Feature]Renaming to make it easy to understand
* [Feature] change warp mode to CLAMP_TO_EDGE
* fix ghost
* simplify visit render queue logic
* support progress timer without rial mode
* support partcile system
* Feature/update label (#149)
* [BugFix] fix compile error
* [Feature] support outline effect in ios
* [Feature] add shader file
* [BugFix] fix begin and end RenderPass
* [Feature] update CustomCommand
* [Feature] revert project.pbxproj
* [Feature] simplify codes
* [BugFix] pack AI88 to RGBA8888 only when outline enable
* [Feature] support shadow effect in Label
* [Feature] support BMFont
* [Feature] support glow effect
* [Feature] simplify shader files
* LabelAtlas work
* handle blend function correctly
* support tile map
* don't share buffer in metal
* alloc buffer size as needed
* support more tilemap
* Merge branch 'minggo/metal-support' into feature/updateLabel
* minggo/metal-support:
support tile map
handle blend function correctly
LabelAtlas work
Feature/update label (#149)
support partcile system
# Conflicts:
# cocos/2d/CCLabel.cpp
# cocos/2d/CCSprite.cpp
# cocos/2d/CCSpriteBatchNode.cpp
# cocos/renderer/CCQuadCommand.cpp
# cocos/renderer/CCQuadCommand.h
* render texture work without saving file
* use global viewport
* grid3d works
* remove grabber
* tiled3d works
* [BugFix] fix label bug
* [Feature] add updateSubData for buffer
* [Feature] remove setVertexCount
* support depth test
* add callback command
* [Feature] add UITest
* [Feature] update UITest
* [Feature] remove unneeded codes
* fix custom command issue
* fix layer color blend issue
* [BugFix] fix iOS compile error
* [Feature] remove unneeded codes
* [Feature] fix updateVertexBuffer
* layerradial works
* add draw test back
* fix batch issue
* fix compiling error
* [BugFix] support ETC1
* [BugFix] get the correct pipelineDescriptor
* [BugFix] skip draw when backendTexture nullptr
* clipping node support
* [Feature] add shader files
* fix stencil issue in metal
* [Feature] update UILayoutTest
* [BugFix] skip drawing when vertexCount is zero
* refactor renderer
* add set global z order for stencil manager commands
* fix warnings caused by type
* remove viewport in render command
* [Feature] fix warnings caused by type
* [BugFix] clear vertexCount and indexCount for CustomComand when needed
* [Feature] update clear for CustomCommand
* ios use metal
* fix viewport issue
* fix LayerColorGradient crash
* [cmake] transport to android and windows (#160)
* save point 1
* compile on windows
* run on android
* revert useless change
* android set CC_ENABLE_CACHE_TEXTURE_DATA to 1
* add initGlew
* fix android crash
* add TODO new-renderer
* review update
* revert onGLFWWindowPosCallback
* fix android compiling error
* Impl progress radial (#162)
* progresstimer add radial impl
* default drawType to element
* dec invoke times of createVertexBuffer (#163)
* support depth/stencil format for gl backend
* simplify progress timer codes
* support motionstreak, effect is wrong
* fix motionstreak issue
* [Feature] update Scissor Test (#161)
* [Feature] update Scissor Test
* [Feature] update ScissorTest
* [Feature] rename function
* [Feature] get constant reference if needed
* [Feature] show render status (#164)
* improve performance
* fix depth state
* fill error that triangle vertex/index number bigger than buffer
* fix compiline error in release mode
* fix buffer conflict between CPU and GPU on iOS/macOS
* Renderer refactor (#165)
* use one vertes/index buffer with opengl
* fix error on windows
* custom command support index format config
* CCLayer: compact vertex data structure
* update comment
* fix doc
* support fast tilemap
* pass index format instead
* fix some wrong effect
* fix render texture error
* fix texture per-element size
* fix texture format error
* BlendFunc type refactor, GLenum -> backend::BlendFactor (#167)
* BlendFunc use backend::BlendFactor as inner field
* update comments
* use int to replace GLenum
* update xcode project fiel
* rename to GLBlendConst
* add ccConstants.h
* update xcode project file
* update copyright
* remove primitive command
* remove CCPrimitive.cpp/.h
* remove deprecated files
* remove unneeded files
* remove multiple view support
* remove multiple view support
* remove the usage of frame buffer in camera
* director don't use frame buffer
* remove FrameBuffer
* remove BatchCommand
* add some api reference
* add physics2d back
* fix crash when close app on mac
* improve render texture
* fix rendertexture issue
* fix rendertexture issue
* simplify codes
* CMake support for mac & ios (#169)
* update cmake
* fix compile error
* update 3rd libs version
* remove CCThread.h/.cpp
* remove ccthread
* use audio engine to implement simple audio engine
* remove unneeded codes
* remove deprecated codes
* remove winrt macro
* remove CC_USE_WIC
* set partcile blend function in more elegant way
* remove unneeded codes
* remove unneeded codes
* cmake works on windows
* update project setting
* improve performance
* GLFloat -> float
* sync v3 cmake improvements into metal-support (#172)
* pick: modern cmake, compile definitions improvement (#19139)
* modern cmake, use target_compile_definitions partly
* simplify macro define, remove USE_*
* modern cmake, macro define
* add physics 2d macro define into ccConfig.h
* remove USE_CHIPMUNK macro in build.gradle
* remove CocosSelectModule.cmake
* shrink useless define
* simplify compile options config, re-add if necessary
* update external for tmp CI test
* un-quote target_compile_options value
* add "-g" parameter only when debug mode
* keep single build type when generator Xcode & VS projecy
* update external for tmp CI tes
* add static_cast<char>(-1), fix -Wc++11-narrowing
* simplify win32 compile define
* not modify code, only improve compile options
# Conflicts:
# .gitignore
# cmake/Modules/CocosConfigDepend.cmake
# cocos/CMakeLists.txt
# external/config.json
# tests/cpp-tests/CMakeLists.txt
* modern cmake, improve cmake_compiler_flags (#19145)
* cmake_compiler_flags
* Fix typo
* Fix typo2
* Remove chanages from Android.mk
* correct lua template cmake build (#19149)
* don't add -Wno-deprecated into jsb target
* correct lua template cmake build
* fix win32 lua template compile error
* prevent cmake in-source-build friendly (#19151)
* pick: Copy resources to "Resources/" on win32 like in linux configuration
* add "/Z7" for cpp-tests on windows
* [cmake] fix iOS xcode property setting failed (#19208)
* fix iOS xcode property setting failed
* use search_depend_libs_recursive at dlls collect
* fix typo
* [cmake] add find_host_library into iOS toolchain file (#19230)
* pick: [lua android] use luajit & template cmake update (#19239)
* increase cmake stability , remove tests/CMakeLists.txt (#19261)
* cmake win32 Precompiled header (#19273)
* Precompiled header
* Fix
* Precompiled header for cocos
* Precompiled header jscocos2d
* Fix for COCOS2D_DEBUG is always 1 on Android (#19291)
Related #19289
* little build fix, tests cpp-tests works on mac
* sync v3 build related codes into metal-support (#173)
* strict initialization for std::array
* remove proj.win32 project configs
* modern cmake, cmake_cleanup_remove_unused_variables (#19146)
* Switch travis CI to xenial (#19207)
* Switch travis CI to xenial
* Remove language: android
* Set language: cpp
* Fix java problem
* Update sdkmanager
* Fix sdkmanger
* next sdkmanager fix
* Remove xenial from android
* revert to sdk-tools-{system}-3859397
* Remove linux cmake install
* Update before-install.sh
* Update .travis.yml
* Simplify install-deps-linux.sh, tested on Ubuntu 16.04 (#19212)
* Simplify install-deps-linux.sh
* Cleanup
* pick: install ninja
* update cocos2d-console submodule
* for metal-support alpha release, we only test cpp
* add HelloCpp into project(Cocos2d-x) for tmp test
* update extenal metal-support-4
* update uniform setting
* [Feature] update BindGroup
* [Feature] empty-test
* [Feature] cpp-test
* [Feature] fix GL compiler error
* [Feature] fix GL crash
* [Feature] empty-test
* [Feature] cpp-tests
* [feature] improve frameRate
* [feature] fix opengl compile error
* [feature] fix opengl compile error
* [BugFix] fix compute maxLocation error
* [Feature] update setting unifrom
* [Feature] fix namespace
* [Feature] remove unneeded code
* [Bugfix] fix project file
* [Feature] update review
* [texture2d] impl texture format support (#175)
* texture update
* update
* update texture
* commit
* compile on windows
* ddd
* rename
* rename methods
* no crash
* save gl
* save
* save
* rename
* move out pixel format convert functions
* metal crash
* update
* update android
* support gles compressed texture format
* support more compress format
* add more conversion methods
* ss
* save
* update conversion methods
* add PVRTC format support
* reformat
* add marco linux
* fix GL marcro
* pvrtc supported only by ios 8.0+
* remove unused cmake
* revert change
* refactor Texture2D::initWithData
* fix conversion log
* refactor Texture2D::initWithData
* remove some OpenGL constants for PVRTC
* add todo
* fix typo
* AutoTest works on mac/iOS by disable part cases, sync v3 bug fix (#174)
* review cpp-tests, and fix part issues on start auto test
* sync png format fix: Node:Particle3D abnormal texture effects #19204
* fix cpp-tests SpritePolygon crash, wrong png format (#19170)
* fix wrong png convert format from sRGB to Gray
* erase plist index if all frames was erased
* test_A8.png have I8 format, fix it
* [CCSpriteCache] allow re-add plist & add testcase (#19175)
* allow re-add plist & add testcase
* remove comments/rename method/update testcase
* fix isSpriteFramesWithFileLoaded & add testcase
* remove used variable
* remove unused variable
* fix double free issues when js/lua-tests exit on iOS (#19236)
* disable part cases, AutoTest works without crash on mac
* update cocos2dx files json, to test cocos new next
* fix spritecache plist parsing issue (#19269)
* [linux] Fix FileUtils::getContents with folder (#19157)
* fix FileUtils::getContents on linux/mac
* use stat.st_mode
* simplify
* [CCFileUtils] win32 getFileSize (#19176)
* win32 getFileSize
* fix stat
* [cpp test-Android]20：FileUtils/2 change title (#19197)
* sync #19200
* sync #19231
* [android lua] improve performance of lua loader (#19234)
* [lua] improve performance of lua loader
* remove cache fix
* Revert "fix spritecache plist parsing issue (#19269)"
This reverts commit f3a85ece4307a7b90816c34489d1ed2c8fd11baf.
* remove win32 project files ref in template.json
* add metal framework lnk ref into cpp template
* test on iOS, and disable part cases
* alBufferData instead of alBufferDataStatic for small audio file on Apple (#19227)
* changes AudioCache to use alBufferData instead of alBufferDataStatic
(also makes test 19 faster to trigger openal bugs faster)
The original problem: CrashIfClientProvidedBogusAudioBufferList
https://github.com/cocos2d/cocos2d-x/issues/18948
is not happening anymore, but there's still a not very frequent issue
that makes OpenAL crash with a call stack like this.
AudioCache::readDataTask > alBufferData > CleanUpDeadBufferList
It happes more frequently when the device is "cold", which means after
half an hour of not using the device (locked).
I could not find the actual source code for iOS OpenAL, so I used the
macOS versions:
https://opensource.apple.com/source/OpenAL/OpenAL-48.7/Source/OpenAL/oalImp.cpp.auto.html
They seem to use CAGuard.h to make sure the dead buffer list
has no threading issues. I'm worried because the CAGuard code I found
has macos and win32 define but no iOS, so I'm not sure. I guess the
iOS version is different and has the guard.
I could not find a place in the code that's unprotected by the locks
except the InitializeBufferMap() which should not be called more than
once from cocos, and there's a workaround in AudioEngine-impl for it.
I reduced the occurence of the CleanUpDeadBufferList crash by moving
the guard in ~AudioCache to cover the alDeleteBuffers call.
* remove hack method "setTimeout" on audio
* AutoTest works on iOS
* support set ios deployment target for root project
* enable all texture2d cases, since Jiang have fixed
* add CCTextureUtils to xcode project file (#176)
* add leak cases for SpriteFrameCache (#177)
* re-add SpriteFrameCache cases
* update template file json
* Update SpriteFrameCacheTest.cpp
* fix compiling error
* use atomic_bool type for _isRotateThreadExited
* add test case for issues 18597
* fix test case error
* add data race comments, fix lock usage error
* add comments for audioplayer
* fix typo in comments
* revert wrong changes
* update test case, keep reproduce
* add alSourceUnqueueBuffers before stop
* improve UnqueueBuffers
* detail test case to show side effect
* remove unused comments
* add comments for AudioPlayer change
* correct a audio log level
* change log level from W to VV
* update time step, add play state check
* remove record time of UnqueueBuffers
* Copyright use python script updated. might be fix by manual later
* Revert "Copyright use python script updated. might be fix by manual later"
This reverts commit 49e99418e4da1fd02afda448ddeb16210f5e8c71.
* re modify copyright, consider utf-8-sig encoding
* another situation, add Copyright before "Permission is hereby granted"
* Revert "another situation, add Copyright before "Permission is hereby granted""
This reverts commit ee82591d32353c7ce2e146fe51ef447433b47571.
* another situation, add Copyright before Permission is hereby granted
* change "Copyright (c) 2016-2016 Chukong Technologies Inc." to " Copyright (c) 2016 Chukong Technologies Inc."
* script modify copyright, consider is cocos copyright or not
* change "Copyright (c) 2017 Chukong Technologies Inc." to "Copyright (c) 2016 Chukong Technologies Inc."
* manual fix, not fix audio related
* change "2016-2016" to "2016"
* [lua-tests] Check the validity of label instance before setString.
fixed http://punchbox.info:3000/issues/26233
* Minor fix: Adds missing test case in NewAudioEngineTest.
* Moves the implementation of AudioEngine::AudioInfo to cpp file.
* fixed#17591: [ios, mac, win32] Audio could not be played in the callback of AudioEngine::setFinishedCallback
* fixed#17591: Adds test case.
* [mac, ios] Adds AudioDecoder::readFixedFrames. And uses readFixedFrames to simply code.
* [mac, ios] ‘ExtAudioFileRead’ may return 0 frame while it doesn’t reach the end of very short audio file.
* [mac, ios] Adds test case for small file test.
* [mac, ios] Adds small audio file.
* [mac, ios] Macro ‘BREAK_IF’ logic fix.
* [mac, ios] Returns false of AudioDecoder::open if total frames is 0.
* fixed#16938: Audio could not be played entirely on iOS/macOS. And refactored some code of decoding.
* Adds license header, removes unused macros.
* issue #16938: Corrects remaining frame count calculation.
* Updates include path.
* Adds comments for AudioDecoder class.
* Adds const for getter functions in AudioDecoder.
* issue #16938: Adds test case.
* Updates license years.
* Deletes trailing white spaces.
* Adds slice9 support for Sprite.
how to use it:
// points coords
sprite->setCenterRect(Rect(x,y,w,h));
// normalized coords
sprite->setCenterRectNormalized(Rect(x,y,w,h));
starts scale9sprite in sprite
more slice 9 changes
sprite 9 slice works?
kind of works
correct anchor point
slice 9 works, at least with non-rotated atlases
streched works ok
better Y invert code.
cleaner, compatible with the previous code
yay, scaling workings...
need a better api now
sets scale correctly
yay! works as expected!
more fixes and tests
better test for box
setContentSize() changes size in non-9-slice mode sprites as well
setCenterRect() -> setCenterRectNormalized()
yet another test
adds setPositionNormalized()
adds setCenterRect() tests
remove devel team from xcode
tests: add one more tests
fun test!
improved test
yet another test for slice 9
* fixes anchorPoint issues
* adds documentation
* fix: using top-left coordinate for setRect
* sprite: fixes related to scale9 and tiled
* Sprite: slice 9 fixes
works Ok with rotated frames
uses `setCapInsets` instead of `setCenterRect` to be more familiar
with `UIScale9Sprite`
* fixes js and lua bindings for Autopolygon
* Warning fixes in AudioDecoder.cpp
* AudioPauseResumeAfterPlay test case should start in onEnter.
And add a loop to pause & resume many times.
* AudioMixerController::initTrack should not setState for track. Otherwise, it may trigger Track state mess-up.
* [audio] Fixes some issues while stop/uncache right after play/preload on OSX/iOS platform.
* Better state control in AudioCache.
* Adds State enum class which contains INITIAL, LOADING, READY, FAILED states.
* AudioPlayer::destroy should check AudioCache::_isAudioLoaded flag, otherwise, app will freeze in cpp-tests/NewAudioEngineTest/6:Test invalid audio file.
* Should check whether state is INITIAL in the destructor of AudioCache.
* Adds test case for switching play state frequently.
* Skips invoking reading data callback if cache's state is INITIAL.
* Variables initialization for AudioCache class and fixes protential missing delete AL buffers.
* Audio latency fix for Android. Support preload effects on Android now.
Squashed commits:
[b6d80fe] log fix
[a0a918e] Fixes assetFd didn't be released while PcmData is returned from cache.
[4b956ba] Potential crash fix for PcmAudioPlayer while pause / resume.
[398ab8c] Updates LOG_TAG position in AudioEngine-inl.cpp
[e3634e7] include stdlib.h for posix_memalign
[9004074] fixes setVolume logical error.
[c96df46] Don't use another thread for mixing, enqueue is in a seperated thread, therefore doing mixing in another thread will waste more time.
[0a4c1a8] Adds setLoop, setVolume, setPostion support for Track
[c35fb20] Fixed include.
[cdd9d32] Do mixing by ourself. (TO BE POLISHED)
[6447025] µ -> u since µ could not be shown on some android devices.
[97be0c6] Don't send a silence clip.
[c1607ed] Make linter.py happy.
[0898b54] Puts enqueue & SetPlayState in PcmAudioPlayer::play to thread pool.
[b79fc01] Adds getDuration, getPosition support for PcmAudioPlayer
[80fa2ab] minor fix of the code position of resetting state to State::INITIALIZED
[d9c62f1] underrun fix for PcmAudioPlayer.
[9c2212a] UrlAudioPlayer, playOverMutex should be static, and should be used in update method.
[1519d2e] static variables
[19da936] _pcmAudioPlayer Null pointer check in AudioPlayerProvider.
[e6b0d14] Updates audio performance test.
[fc01dd4] Registers foreground & background event in AudioEngine-inl.cpp(android), the callback should invoke `provider`'s pause & resume method.
[e00a886] TBD: Pause & resume support for PcmAudioPlayerPool.
Since OpenSLES audio resources are expensive and device shared, we should delete all unused PcmAudioPlayers in pool while pause and re-create them while resume.
But this commit isn't finished yet, I don't find a better way to register pause&resume event in AudioEngine module.
[9e42ea3] Interleave mono audio to stereo audio. PcmAudioPlayerPool only contains PcmAudioPlayers with 2 channels.
[3f18d05] Adds a strategy for checking small size of different file formats.
[753ff49] Adds performance test for AudioEngine.
[09d3045] Releases an extra PcmAudioPlayer for UrlAudioPlayer while allocating PcmAudioPlayer fails.
[9dd4477] Using std::move for PcmData move constructor & move assignment.
[6ca3bcb] some fixes:
1) new -> new (std::nothrow)
2) break if allocate PcmAudioPlayer fails
3) renames 'initForPlayPcmData' to 'init'
4) PcmAudioPlayer destructor deadlock if 'init' failed
[54675b6] include path fix.
[a1903ca] More refactorings.
[19b9498] Makes linter.py happy. :)
[923c530] Fixes:
1) Avoid getFileInfo to be invoked twice
2) A critical bug fix for UrlAudioPlayer and adds detailed comments
3) __clang__ compiler option fix for AudioResamplerSinc.cpp.
[5ec4faf] minor fix.
[faaa0f3] output a log in the destructor of UrlAudioPlayer.
[9c20355] NewAudioEngineTest,TestControll crash fix.
[f114464] fixes an unused import.
[1dc5dab] Better algorithm for allocating PcmAudioPlayer.
[331a213] minor fix.
[e54084a] null -> nullptr
[f9a0389] Support uncache.
[89a364f] Removes unused update, and TODO uncache functionality.
[1732bf9] Supports AudioEngineImpl::setFinishCallback for android.
[43d1596] UrlAudioPlayer::stop fix.
[e2ee941] Test case fix in NewAudioEngineTest/AudioIssue11143Test
[5c5ba01] More fixes for making cpp-tests/New Audio Engine Test happy.
[8b554a3] Adds log while remove player from map.
[ed71322] If original file is larger than 30k bytes, consider it's a large audio file.
[fb1845a] Updates project.properties
[6f3839f] minor log output fix in AudioEngine-inl.cpp
[c68bc6c] Don't resample if the sample rate of the decoded pcm data matchs the device's.
[43ca45f] PcmAudioPlayers also need to be removed while they play over, but should not be deleted since their lifecycle is managed by PcmAudioPlayerPool.
[f5e63c9] Audio latency fix for Android. Support preload effects on Android now.
* Supports to loading audio files asynchronously.
* Crash fix for stop audio right after play2d.
* Minor fix for logic in AudioMixerController.cpp
* Adds missing files (CCThreadPool.h/.cpp).
* Minor fix for including.
* Minor fix for missing include <functional> in Track.h
* update license information in audio.h
* Don't use std::future/std::promise anymore since ndk counldn't support it well in armeabi arch.
* isSmallFile postion updated, fixes large audio file goto the checking logic of cache.
* std::atomic<int> isn't supported by ndk-r10e while compiling with `armeabi` arch, using a int with a mutex instead.
* fixes __isnanf & posix_memalign doesn't exist on low api (<=16) devices.
* namespace updated: cocos2d -> cocos2d::experimental
* Removes commented code in AudioMixerController.h/.cpp
* Removes unused code again, and fixes a memory leak of `Track` instance.
* Oops, namespace changed.
* Only outputs log in debug mode.
* Uses ALOGV for outputing logs in AudioEngine-inl.cpp
* const PcmData& -> PcmData for Track
* Fixes a protential crash in NewAudioEngineTest
* Adds `COCOS` prefix in header #ifndef COCOS_BALABALA #define COCOS_BALABALA
* Uses _ prefix for cocos code style instead of `m` prefix.
* Deletes AudioResamplerSinc related files.
* Bug fix from @minggo's reply on github.
* Don't need to invoke pause after in UrlAudioPlayer::prepare.
* Updates ThreadPool class, uses enum class and adds const keyword.
coulsonwang