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
mul r0.rgb, t1, t0 ; fold in lightmap (color)
+mov r0.a, v0.a ; fold in lightmap (alpha)
mul_x2 r0.rgb, c0, r0 ; * 2 * (overbrightFactor/2)