tf2/tf2_src/materialsystem/stdshaders/ShadowBuildTexture.psh

ps.1.1

;------------------------------------------------------------------------------
; Use the vertex color, modulate vertex alpha by texture alpha
;------------------------------------------------------------------------------
def c0, 1.0f, 1.0f, 1.0f, 1.0f

tex t0

; relevant data is in alpha channel
mov r0.rgb, c0 +
mul r0.a, v0.a, t0.a