Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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; DYNAMIC: "WRITEONETODESTALPHA" "0..1"
ps.1.1
tex t1 ; cube map
mul r0.rgb, t1, c2 + ; envmap * envmaptint (color only) +
mov r0.a, c3.a ; Use alpha from modulation... (?)
mul r0.rgb, v0, r0 ; apply vertex lighting
mul_x2 r0.rgb, c0, r0 ; * 2 * (overbrightFactor/2)
#if WRITEONETODESTALPHA
+mov r0.a, c4 ; make alpha 255
#endif