Tom's Hardware has a nice review on mobile GPUs getting ready for 'Daydream' VR. Among the technologies being used are Khronos' ASTC specification and OpenGL ES. The Adaptive Scalable Texture Compression (ASTC) technology supported by ARM’s latest Mali and other recent GPUs on the market will reduce bandwidth requirements while still delivering decent graphics quality. On the software side, ARM has been optimizing its drivers to reduce latency and ensure fast context switching that is necessary for VR. ARM also enabled a few more OpenGL ES extensions to support efficient rendering to multiple views for both stereo and foveated rendering. Qualcomm's Snapdragon 820 SoC, which comes with the Adreno 530 GPU, has been optimized for VR. It has support for 3D stereoscopic and foveated rendering, the latest graphics APIs such as OpenGL ES 3.2 and Vulkan, and 360-degree 4k video decoding at 60fps.