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
; Get the color from the texture
tex t0
tex t3
lrp r0, c1, t3, t0 ; Lerp between textures
mul r0, r0, c3
mul r0.rgb, v0, r0 ; Apply lighting
mul_x2 r0.rgb, c0, r0 ; * 2 * (overbrightFactor/2)
#if WRITEONETODESTALPHA
+mov r0.a, c4 ; make alpha 255
#endif