GPU Pro 6

412 V Mobile Devices

and from the GPU’s memory. Although the camera input is stored on the GPU,

existing image-processing applications tend to transfer the data to the host device

(the CPU), where they serially process the data and render it to the display using

OpenGL. Clearly this process can cause several inefficient transfers of data back

and forth between the CPU and GPU.

What is required is an approach that avoids any unnecessary memory transfers

between the GPU’s memory and the host’s memory. OpenCL/OpenGL interop-

erability supports this approach. Input from the camera can be acquired in the

form of an OpenGL ES texture using Android’s

SurfaceTexture ...