Patent ID: 9710957
Date: 2017-07-18
CPC Classifications: G06F,G06T

Claim:
1. A method of rendering graphics with a processor, the method comprising: setting up a plurality of objects in a scene in virtual space, each said object being defined by a set of vertices; assigning a unique object identifier to each of the objects; issuing one or more draw calls to draw the objects; manipulating parameter values of the vertices to generate output vertex parameter values; setting up a plurality of primitives from the vertices, each said primitive being defined by a set of one or more of the vertices and each said primitive belonging to one or more of the objects; performing geometry shading in which one or more output primitives are generated from one or more input primitives, wherein performing the geometry shading includes generating a primitive identifier for one or more primitives generated by the geometry shading by incrementing a primitive identifier for each input primitive by a maximum amount of geometric amplification of output primitives supported by an object with which the input primitives are associated; rasterizing each of the primitives for a plurality of pixels; writing a depth at each said pixel to a Z buffer, the Z buffer having a first resolution; writing one or more of the object identifiers to at least one ID buffer, such that each pixel in the Z buffer is associated with an object identifier in the ID buffer; processing the pixels for each of the rasterized primitives to determine a set of color values in a color buffer, the color buffer having a second resolution that is less than the first resolution; and determining a set of display pixels for an output frame at the resolution of the Z buffer using the color values in the color buffer and the identifiers in the ID buffer.