1. A method, comprising: defining a frustum projected from a grid cell corresponding to a light source in light-space; determining that a graphics primitive intersects the frustum; accessing a light-space visibility buffer to obtain a set of pixel fragment footprints corresponding to the frustum, wherein a first pixel fragment footprint of the pixel fragment footprints forms a base of the frustum and a number of samples within the first pixel fragment footprint is based on an orientation of a tangent plane of a second graphics primitive; identifying whether each pixel fragment footprint of the pixel fragment footprints is shadowed by the graphics primitive; and rendering, by a parallel processing unit, a final shadowed image including the set of pixel fragment footprints for display on a display device.