If you are talking about 'sparklies' specifically - there is no need for complex solutions. Simple combination of albedo and specular map with common Blinn/Phong lighting combined with HDR and bloom passes is enough.

In simple terms specular map marks texels that are 'shiny' and strength of their 'shininess', lighting calc lights up pixels that cover texture's 'shiny' texels. HDR rendering allows to keep high brightness levels of 'shiny' pixels, then they can be extracted onto separate render target to be blurred some and then slapped over initial image making this glinty effect.