Using OpenGL ES on iPad is identical to using OpenGL ES on other iPhone OS devices. An iPad is a PowerVR SGX device and supports the same basic capabilities as other SGX devices. However, because the processor, memory architecture, and screen dimensions are different for iPad, you should always test your code on an iPad device before shipping to ensure performance meets your requirements.這與之前Bright Side of the News推測採用ARM-Based GPU的規格不同。目前對「A4」的最新說法似乎是「ARM處理器加上PowerVR SGX 繪圖核心封裝在同一塊晶片內」。
不過其實還有另外一種說法，就是「Apple A4」其實是以PA6T-1682M，一個以IBM Power技術的雙核心處理器為基礎。這牽扯到Apple收購的晶片設計公司PA Semi與一大串的技術歷史，有興趣的人可以去看看這個Blog上的分析，因為真的又長又有點複雜，所以有興趣的人請自行觀看吧。（話說目前全地球好像就只有這個Blog不是把A4推測為ARM-Base…）
【via】Apple Confirms iPad Uses PowerVR SGX Graphics Hardware - Mac Rumors and Mark's Tech Chat
我看不出來原文哪裡有提到A4是"ARM處理器加上PowerVR SGX 繪圖核心封裝在同一塊晶片內"
回覆刪除一般對A4的推測最多是"ARM ip+PowerVR ip"的SoC
Apple is a licensee and major investor in Imagination Technologies who creates the PowerVR SGX chips and has used them throughout the iPhone and iPod Touch designs. Apple's new A4 chip from Apple incorporates both the ARM processor as well as the PowerVR SGX GPU in a single chip.
回覆刪除