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2009/12/21

iPhone OpenGL ESの秘密

iPhone 採用されているOpenGL ESは2種類あります。

OpenGL ES1とES2。

SDK3.0以前はES2がなかったと思います。だからOpenGLのテンプレートを使ってプロジェクトを作成してもOpenGLのヘッダーとソースは1セットしかなかったのに、SDK3.0からソースとヘッダーが
それぞれ
ES1Renderer.h
ES1Renderer.m

ES2Renderer.h
ES2Renderer.m

となります。

ES1はiPhone 3G用でES2がiPhone 3GS、第三世代iPod Touch用となります。
ES2の機能を使わないのであればES1で問題ないようです。

ES2の機能ってなに?ってしらべてみるとES1の固定機能パイプラインの代わりにプログラマブルシェーダーが実装されてるんだそうです。

それ以上はよくわかりませんが、ソースコードをみるとES2が使えればつかうようにコードがかかれているので、気にしなくても大丈夫ではないかと思います。

iPhone 3Gと3GSでそんな違いがあったんですね。

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