1 files changed, 39 insertions, 0 deletions
diff --git a/mp/src/materialsystem/stdshaders/WaterCheapFresnel_ps14.psh b/mp/src/materialsystem/stdshaders/WaterCheapFresnel_ps14.psh
new file mode 100644
index 00000000..5ebb39f4
--- /dev/null
+++ b/mp/src/materialsystem/stdshaders/WaterCheapFresnel_ps14.psh
@@ -0,0 +1,39 @@
+ps.1.4
+
+; 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!!!
+
+; 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)
+
+phase
+
+; Sample environment map
+texld  r3, r2
+texld  r4, t5					; Normalize the tangent-space eye vector
+	 
+; dot eye-vector with per-pixel normal from r0
+dp3_sat	r1, r4_bx2, r0_bx2
+
+; run Fresnel approx. on it: R0 + (1-R0) (1-cos(q))^5 in alpha channel
+mul r0.a, 1-r1.a, 1-r1.a			; squared
+mul r0.a, r0.a, r0.a				; quartic
+mul_sat r1.a, r0.a, 1-r1.a			; quintic
+
+; multiply color by reflecttint
+mul r0.rgb, r3, c1
++mov_sat r0.a, v0.a
+add_sat r0.a, r1.a, r0.a