A first processing unit, such as a CPU, is configured to encode information that represents values of pixels in a block of an image in a lightfield dataset at a first bit rate that is selected from a plurality of bit rates and generate a block descriptor that includes information indicating locations of the encoded information for each pixel. A memory is configured to store the block descriptor and the encoded information in a format that is accessible by a second processing unit, such as a GPU, on a pixel-by-pixel basis. The second processing unit is configured to access, on the pixel-by-pixel basis, the encoded information representative of a value of a pixel in the block, decode the encoded information, and render the value of the pixel for presentation on a display.