Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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ps.1.1
;------------------------------------------------------------------------------
; Draw a texture . . woo hoo!
; t0 - texture
;
; The texture coordinates need to be defined as follows:
; tc0 - texcoords
;------------------------------------------------------------------------------
tex t0
tex t1
; Blend between grey and lightmap color based on total alpha
def c0 0.5f 0.5f 0.5f 1.0f
mul_x2 r1.rgb, c0, t1 ; Apply overbright to lightmap
+ mul r1.a, t0, v0 ; base times vertex alpha
; GR - workaround for const/lerp issues
mul r0.rgb, c1, t0 ; Self illum * tint
+mul_sat r0.a, c1, t0
lrp r1.rgb, t0.a, r1, r0 ; Blend between self-illum + lightmap
lrp r0, r1.a, r1, c0 ; interpolate between grey + color