Ogre 1.7中使用多線程

在Ogre 1.7中，對多線程的支援有三個選擇：

要在Ogre 1.7中使用多線程：

1. 在OgreBuildSettings.h改寫2行
   1. OGRE_THREAD_SUPPORT 2  // 通過ResourceBackgroundQueue實現。
   2. OGRE_THREAD_PROVIDER 3 // TBB library provides threading functionality

我採用C++的並行編程模板庫Threading Building Blocks。採用CMake構造的需要把TBB的檔案拷貝到Ogre的Dependence的相關目錄下。

Ogre 1.7 的 Threading changes

• WorkQueue added to accept generalised work items to be executed in background worker threads
• WorkQueue starts the number of workers based on hardware, or can be told to start a different number
• Main Ogre WorkQueue is in Root::getWorkQueue. You can also subclass WorkQueue and provide your own if you want
• ResourceBackgroundQueue now uses WorkQueue instead of using its own queue and can have multiple tasks running at once
• New focus on data-driven, task-based parallel execution with separation of GPU and CPU activities
• Boost, POCO and Thread Building Blocks supported as threading back-ends (Boost preferred)
• All Ogre thread support will use WorkQueue in future

備忘：1.7添加了一個Character Sample，其中SinbadCharacterController有參考價值。

 

採用OGRE_THREAD_SUPPORT = 1並不被推薦，而應該使用OGRE_THREAD_SUPPORT = 2。sinbad在Using the new threading scheme說明了原因。更具體的討論在high performance thread support - request for comments。當前，有Proposal: OGRE_THREAD_SUPPORT == 3，但是沒有整合到Ogre 1.7中。

關於多線程參考：多線程的渲染與物理類比（pdf）和Threading the OGRE3DRender System（pdf）

2010/07/07重新整理：關於WorkQueue可以參考OGRE多線程的使用