每个 iPhone/iPod 型号有多少 VRAM？
我知道 MBX 型号的 VRAM 限制为 24MB。 SGX 模型怎么样？ 我可以假设所有 iPhone/iPod touch 型号至少都有 SGX 或 MBX 吗？没有其他型号吗？ 它们有多少内存带宽（往返 GPU）？
I know MBX model has limit of 24MB VRAM. How about SGX models?
And can I assume all iPhone/iPod touch models have SGX or MBX at least? No other models?
And how much memory bandwidth (to/from GPU) they have?
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我不认为它是 VRAM：视频硬件从真正的主内存中获取（映射）内存。
您可以对可用于纹理和缓冲区的内存做出一些假设，但您必须非常小心。在可用内存方面，旧款和新款 iPod Touch 和 iPhone 之间肯定存在差异。
您可以在运行时检查 CPU 和 OpenGL ES 功能。这样做而不是查看特定的设备型号。
I don't think it is VRAM: the video hardware takes (maps) memory from the real main memory.
You can make some assumptions about memory available for textures and buffers but you have to be really careful with that. There is most certainly a difference between older and newer models of both the iPod Touch and iPhone when it comes to available memory.
You can check the CPU and OpenGL ES capabilities at runtime. Do that instead of looking at a specific device model.