1. A method of rendering graphics in a computer device, comprising: determining, by a graphic processing unit (GPU) at a rasterization stage, map coordinates based on coarse scan converting a primitive of an object, the map coordinates indicating a location on a sampling rate parameter (SRP) map of a fragment within the primitive of the object; identifying, by the GPU at the rasterization stage, a lookup value for the fragment within the primitive of the object based at least on the map coordinates; calculating, by the GPU at the rasterization stage, a respective fragment variable SRP value for the fragment within the primitive of the object based at least on the lookup value; and shading, by the GPU at a pixel shader stage, the fragment within the primitive of the object based on the respective fragment variable SRP value.