Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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ps.1.1
;------------------------------------------------------------------------------
; Draw a alpha blended, translucent (alpha in texture) texture.
; t0 - texture
;
; c0 - overbright value
;
; The texture coordinates need to be defined as follows:
; tc0 - texcoords
;------------------------------------------------------------------------------
; Get the color from the texture
tex t0
tex t1
mul r0.rgb, t0, t1 ; base * lightmap
mul_x2 r0.rgb, c0, r0 ; * 2 * (overbrightFactor/2)
mov r0.a, t0.a