Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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5 years ago
ps.1.1
def c0, 1.0f, 1.0f, 1.0f, 1.0f
tex t0
; To accomplish shadow fading, subtract vertex alpha from texture alpha
; color channel isn't used...
sub_sat r0.a, t0.a, v0.a
; Blend between white and the constant color...
lrp r0.rgba, 1-r0.a, c0, c1