FCPrimal: Fix fake reflections in cave

This follows the same pattern as Unity & MGSV specular highlights by
moving the camera position, and overall this seems to be a very
successful pattern for fixing reflections.

Far Cry Primal/ShaderFixes/d909f411b9443090-ps.txt

@@ -1,3 +1,4 @@
+// Water in caves with only environment reflections
 //
 // Generated by Microsoft (R) HLSL Shader Compiler 9.29.952.3111
 //
@@ -323,10 +324,29 @@ dcl_input_ps linear v4.xyz
 dcl_input_ps linear v5.xyz
 dcl_input_ps linear v6.xy
 dcl_output o0.xyzw
-dcl_temps 21
+dcl_temps 24
+dcl_resource_texture2d (float,float,float,float) t125
+
+ld_indexable(texture2d)(float,float,float,float) r21.xyzw, l(0, 0, 0, 0), t125.xyzw
+
+// Fix envionment reflections by adjusting the world space CameraPosition:
+
+mul r22.x, -r21.x, r21.y
+mov r22.yzw, l(0.0)
+
+dp4 r23.x, r22.xyzw, cb0[0].xyzw
+dp4 r23.y, r22.xyzw, cb0[1].xyzw
+dp4 r23.z, r22.xyzw, cb0[2].xyzw
+dp4 r23.w, r22.xyzw, cb0[3].xyzw
+dp4 r22.x, r23.xyzw, cb0[4].xyzw
+dp4 r22.y, r23.xyzw, cb0[5].xyzw
+dp4 r22.z, r23.xyzw, cb0[6].xyzw
+
+add r22.xyz, cb0[42].xyz, -r22.xyz
+
 dp3 r0.x, v3.xyzx, v3.xyzx
 sqrt r0.x, r0.x
-add r0.yzw, -v4.xxzy, cb0[42].xxzy
+add r0.yzw, -v4.xxzy, r22.xxzy
 dp3 r1.x, r0.yzwy, r0.yzwy
 rsq r1.x, r1.x
 mul r1.yzw, r0.yyzw, r1.xxxx
@@ -466,7 +486,7 @@ mad r5.w, r5.w, cb1[2].x, cb1[2].y
 add r5.w, -r5.w, v4.z
 mul_sat r5.w, -r5.w, cb2[18].x
 sqrt r5.w, r5.w
-add r8.xy, v4.xyxx, -cb0[42].xyxx
+add r8.xy, v4.xyxx, -r22.xyxx
 dp2 r6.w, r8.xyxx, r8.xyxx
 mad r6.w, cb1[1].x, r6.w, cb1[1].y
 mul_sat r6.w, r6.w, l(3.000000)
@@ -885,7 +905,7 @@ mul r9.xyz, r7.wwww, r9.xyzx
 mul r9.xyz, r8.wwww, r9.xyzx
 mul r9.xyz, r4.wwww, r9.xyzx
 mul r4.xyz, r4.xyzx, r7.wwww
-mad r7.xzw, -r1.yywz, r3.xxxx, cb0[42].xxyz
+mad r7.xzw, -r1.yywz, r3.xxxx, r22.xxyz
 mul_sat r10.xyz, cb7[11].xyzx, -cb7[12].zzzz
 add r4.w, -r7.w, v4.z
 max r4.w, r4.w, l(0.000000)
@@ -1080,7 +1100,7 @@ mad r0.yzw, r0.yyzw, r1.wwww, r1.xxyz
 lt r1.xy, l(0.000000, 0.000000, 0.000000, 0.000000), cb0[39].zwzz
 and r1.x, r1.y, r1.x
 if_nz r1.x
-  add r1.xyz, v4.xyzx, -cb0[42].xyzx
+  add r1.xyz, v4.xyzx, -r22.xyzx
   dp3 r1.x, r1.xyzx, r1.xyzx
   sqrt r1.x, r1.x
   utof r1.yz, r6.xxzx
@@ -1100,7 +1120,7 @@ if_nz r1.x
   ld_structured_indexable(structured_buffer, stride=16)(mixed,mixed,mixed,mixed) r3.x, l(0), l(12), t2.xxxx
   mul r1.xyz, r1.xyzx, r3.xxxx
 else 
-  add r3.xyz, v4.xyzx, -cb0[42].xyzx
+  add r3.xyz, v4.xyzx, -r22.xyzx
   dp3 r3.x, r3.xyzx, r3.xyzx
   sqrt r3.x, r3.x
   mad_sat r3.x, r3.x, cb0[35].y, cb0[35].x