AMD Plans to Add Support For Valve’s Asynchronous Reprojection

Posted by at 7:44 am on March 1, 2017

During the Capsaicin and Cream event at GDC in San Francisco, AMD revealed that the next Radeon driver release will enable Valve’s Asynchronous Reprojection on AMD graphics cards.

Graphics performance is of utmost importance for virtual reality games and experiences. In VR, if the framerate drops below 90 FPS, you’re most likely not going to enjoy the experience. Valve and Oculus have continued to develop technology that helps developers maintain smooth performance across a wide range of VR-ready hardware, but it’s up to hardware manufacturers as well as software creators to adopt those methods.

Oculus employs Asynchronous Timewarp (ATW) to give the illusion of a smooth frame rate, even when the performance dips below the desired 90 FPS. ATW examines the positional data of your headset from the current frame and re-draws the previous frame with the new positional data.

Valve initially used a different approach to solve the same problem. Interleaved Reprojection automatically cut the frame rate in half whenever it dropped below 90 FPS, and then reprojected the previous frame.

Asynchronous Timewarp and Interleaved Reprojection work well for an experience that doesn’t include tracked hands and a lot of moving objects, but they don’t solve the full problem. In November, Oculus revealed Asynchronous Spacewarp, which calculates the position of your tracked hands (or controller), character movement, and camera movement, not just the headset orientation, before drawing a new frame.

Valve’s Asynchronous Reprojection, released to the beta track of Steam VR in October, and rolled out to all SteamVR clients on November 15, is akin to ATW, offering more fine-grained control over context switching (between reprojection and normal frame rendering).

When Valve launched Asynchronous Reprojection, it supported Nvidia graphics cards with GeForce driver 372.54, but AMD graphics cards weren’t supported (normal interleaved reprojection was, however). It took AMD more than five months to build support for Asynchronous Reprojection into its graphics driver, but the wait is almost over. The next iteration of Radeon Software Crimson ReLive, which is expected in March, enables the helpful performance feature on AMD GPUs.

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