ps.1.1
tex t0 ; basetexture
tex t1 ; lightmap
mov r0.a, 1-t1.a
;mov r0.rgb, t0 ; * 2 * (overbrightFactor/2)
;mov_x2 r0.rgb, t0 ; * 2 * (overbrightFactor/2)
mul r0.rgb, t0, t1;
mul_x2 r0.rgb, c0, r0 ; * 2 * (overbrightFactor/2)