三維電腦繪圖著色器設計

Abstract

在本論文中，會先對現有的著色演算法作一完整的介紹，之後提出一個有效率的著色方法。它考量到影像畫質的真實性，亦可以降低運算複雜度。根據這個演算法，我們設計出一個低複雜度且快速的著色電路。整個架構使用到對數及指數的運算單元。在此我們也提出一個改進此兩運算的方法。比起原先的方法，新的設計有較小的面積但保有一樣的速度。經過模擬驗證，我們的著色器可以符合現今一般場景所需的填圖率。

In the thesis, the shading algorithms in existence for 3D computer graphics were studied. An efficient shading algorithm was proposed. Its performance of computational complexity and image quality are evaluated. Based on the proposed shading algorithm, a VLSI architecture is designed, which has low complexity and high speed. In this architecture, logarithm and exponential functions are employed. To reduce the complexity of these two operations, we modified a known efficient design (Symmetric Table Add Method). The improved design has a smaller area than that of the original method. Finally, we synthesized the graphic shader using Synopsys and 0.35μm cell library. Simulation shows that our design is efficient for moderate scene rate in nowadays applications.