hl2_src-leak-2017/src/materialsystem/stdshaders/ShadowBuildTexture.psh

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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