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materialsystem/stdshaders/LightmappedGeneric_BumpmappedEnvmap_ps14.psh

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+; STATIC: "NORMALMAPALPHAENVMAPMASK" "0..1"
+ps.1.4
+;------------------------------------------------------------------------------
+; Phase 1
+;------------------------------------------------------------------------------
+; Get the 3-vector from the normal map
+texld  r0, t0
+; Get environment matrix
+texcrd r1.rgb, t1
+texcrd r2.rgb, t2
+texcrd r3.rgb, t3
+; Normalize eye-ray vector through normalizer cube map
+texld  r4, t4                  ; <---- CUBE MAP here!!!
+;mov r0.rgba, r4
+
+; Transform normal
+dp3    r5.r, r1, r0_bx2
+dp3    r5.g, r2, r0_bx2
+dp3    r5.b, r3, r0_bx2
+; Reflection calculatiom
+dp3_x2 r3.rgb, r5, r4_bx2      ; 2(N.Eye)
+mul    r3.rgb, r5, r3          ; 2N(N.Eye)
+dp3    r2.rgb, r5, r5          ; N.N
+mad    r2.rgb, -r4_bx2, r2, r3 ; 2N(N.Eye) - Eye(N.N)
+
+#if NORMALMAPALPHAENVMAPMASK
+; Alpha gets lost after phase marker, so store it here
+mov    r5, r0.a
+#endif
+
+;------------------------------------------------------------------------------
+; Phase 2
+;------------------------------------------------------------------------------
+; What's left over from the last phase:
+; r0 - normal
+; r1 - free
+; r2 - vector to sample in envmap
+; r3 - free
+; r4 - normal
+; r5 - normal map alpha (rgba)
+
+phase
+
+; Sample environment map
+texld  r3, r2
+
+; dot eye-vector with per-pixel normal from r0
+dp3_sat	r1, v0_bx2, r0_bx2
+
+; Result goes in output color (multiply by constant color c0)
+mul    r0.rgb, r3, c0
+
+; run Fresnel approx. on it: R0 + (1-R0) (1-cos(q))^5 in alpha channel
+mul		r1.rgb, r0, r0
++mul r0.a, 1-r1.a, 1-r1.a			; squared
+
+lrp		r0.rgb, c1, r1, r0 ; blend between color and color * color
++mul r0.a, r0.a, r0.a				; quartic
+
+dp3		r1.rgb, r0, c3
++mul r0.a, r0.a, 1-r1.a				; quintic
+
+lrp		r0.rgb, c2, r0, r1			; blend between color and greyscale
+mad r0.a, r0.a, c6.a, c4.a			; Take Fresnel R(0) into consideration
+
+mul r0.rgb, r0, r0.a				; multiply output color by result of fresnel calc
+
+#if NORMALMAPALPHAENVMAPMASK
++mul r0.a, c0.a, r5.r				; Fade amount * alpha from the texture
+#else
++mov r0.a, c0.a						; Just use the fade amount
+#endif