1. A method of graphics processing in a graphics processing unit (GPU), the method comprising: receiving a first texture map having texels of a first primitive data type; receiving a second texture map having texels of a second primitive data type, the first and second primitive data types being different from one another, the first and second texture maps comprising a set of texture maps that define an appearance of a three-dimensional object, the first and second texture maps having a same size; determining, using a first texturing unit of the GPU, an interpolation parameter for a texel of the first primitive data type in the first texture map to map to a pixel of an image, the image representing the three-dimensional object, the interpolation parameter comprising a weight to be applied to the texel of the second primitive data type; and re-using the interpolation parameter determined for the first texture map adapted for the second primitive data type in the second texture map by using a second texturing unit of the GPU to apply a texel of the second primitive data type in the second texture map.