CWT中OpenGL實作之研究

Abstract

在Java中，用來開發使用者圖形介面(GUI)的函式庫，如Abstract Window Toolkit(簡稱AWT)或是Swing，為影響以Java開發之應用程式繪圖效能最關鍵的一部份。然而Java在繪圖效能上的表現卻不夠理想，雖然Java的版本一再更新，也針對Java本身的繪圖效能作了很多的改善，但還有一部分不算少數的使用者還在使用較舊版本的Java，因此這些人無法得到新版本所提供的各項效能改進。而且很多軟體當初是在舊版本上開發的，這些軟體也無法直接獲得新版本所提供的效能改善，除非修改原始碼，使用新版本中提出的API。此外，Java在不同作業系統上的效能並非一致，這也會造成Java程式開發者在效能評估上的困難。

因此，為了要提升Java的繪圖效能以及讓現有的Java程式可以直接受惠，本論文基於一套開放式的架構CYC Window Toolkit(簡稱CWT)[32]之上，實作出OpenGL的部份，利用OpenGL繪圖函式庫，完成各項的繪圖操作，並針對效能的部份做優化，使其可以在不同的作業系統間達成：提升繪圖效能、效能可攜性。

The libraries such as Abstract Window Toolkit (AWT) and Swing used to develop Graphical User Interface (GUI) are the key parts of rendering performance for applications designed in Java. However, the rendering performance in Java is not very efficient. While new Java versions are released to improve rendering performance, some users still keep using the old ones. They cannot have the benefits from the new Java releases. In addition, the applications, which were developed in the old Java releases, cannot get the benefits of improving rendering performance from the new ones unless modifying the source codes for new APIs. Moreover, the performance of Java on different operating systems is inconsistent. It is hard to estimate the performance of Java applications for developers.

To improve rendering performance in Java and let the existed Java applications benefit from this, this thesis implements the OpenGL part based on CYC Window Toolkit (CWT)[32]. We do all rendering operations with OpenGL and optimize the rendering performance to achieve: performance improvement and portable performance on different operating systems.