Team Fortress 2 Source Code as on 22/4/2020
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ps.1.1
;------------------------------------------------------------------------------; See the vertex shader for info;; This shader takes:; t0 = normal map; t1 = base texture; v0 = directional light color; t2 = directional light direction (biased into 0-1); c0 = percent of dirlight to add as ambient;; Output:; (t0 dot t1) * v0;------------------------------------------------------------------------------
tex t0 ; Get the 3-vector from the normal maptex t1 ; Interpret tcoord t1 as color data.texcoord t2
dp3 r1, t0_bx2, t2_bx2 ; r1 = normalMap dot dirLightDiradd r0, r1, c0 ; + 0.5
mul r1, v0, r0 ; scale the dot product by the dirlight's actual colormul r0.rgb, r1, t1 + ; scale by the texture color
mul r0.a, t1.a, v0.a
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