AMD的Polaris白皮书其中有一页写到RX 480有预留4个CU单元用作某些音频处理任务，而下边的注释又加了一句当这4个预留的CU单元在使用时，是无法做其他任务的，
real-time audio raytracing真要做好，我个人理解计算量不低。amd想借这一招棋走好vr，至于是否是一招好棋只有让时间来说话了。不过不要忘了ps4 neo和psvr的存在，这两对主导游戏发展的走向起到很大的影响。
顺便再引用一下，AMD对Trueaudio的官方说明How AMD TrueAudio removes constraints on sound developers
AMD TrueAudio technology is all about giving sound engineers the freedom to follow their imaginations and the power to make their games sound as convincing as they look. Here are some of the features that make that possible:
- A dedicated digital signal processor (DSP) is built in to the AMD GPU core. That’s a hefty dose of processing power committed just to generating immersive soundscapes. That doesn’t just enable new and exciting audio features in games; it also saves CPU cycles that can be used for other tasks.
- Programmable sound effects bring to audio the same kind of flexibility that programmable shaders brought to graphics. Game developers aren’t stuck with inflexible canned effects anymore. They now have the flexibility to create complex effects and acoustic environments.
- More voice channels and audio objects mean game developers no longer have the unenviable task of determining which sounds are expendable. AMD TrueAudio technology multiplies the number of sounds a game can generate at once, giving developers the capacity to create much more lifelike soundscapes.
- True to life echoes and convolution reverb are finally available on all platforms, meaning programmers can now build these effects into their games rather than relying on basic reverbs. The types of real-world acoustic phenomena that can be faithfully reproduced are massively greater.
- Multi-channel spacialization brings in-headset surround sound with accurate positional audio algorithms to all gamers; not just the ones with the priciest headgear.
5个里面，后面3个新特性明显是给vr用的：多声源融合，回声反射（混响）模型，精确多音源定位。个人理解是amd把这些都做好了，留出接口给开发者调用。按照wiki上的说法，GPGPU编程确实会方便许多。
A new version of TrueAudio, TrueAudio Next, was released with the AMD Radeon 400 series GPUs. TrueAudio Next utilizes the GPU to simulate audio physics. The move from a dedicated DSP to GPGPU breaks compatibility with the previous TrueAudio implementation.
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