Merge pull request #948 from Groovounet/fog-bug

Fixed LW fog with OpenGL/ES APIs

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/Core.hlsl

     #define OUTPUT_NORMAL(IN, OUT) OUT.normal = TransformObjectToWorldNormal(IN.normal)
 #endif
 
-#if defined(UNITY_REVERSED_Z)
-    #if UNITY_REVERSED_Z == 1
-    //D3d with reversed Z => z clip range is [near, 0] -> remapping to [0, far]
-    //max is required to protect ourselves from near plane not being correct/meaningfull in case of oblique matrices.
-    #define UNITY_Z_0_FAR_FROM_CLIPSPACE(coord) max(((1.0-(coord)/_ProjectionParams.y)*_ProjectionParams.z),0)
-#else
-    //GL with reversed z => z clip range is [near, -far] -> should remap in theory but dont do it in practice to save some perf (range is close enough)
-    #define UNITY_Z_0_FAR_FROM_CLIPSPACE(coord) max(-(coord), 0)
+#if UNITY_REVERSED_Z
+    #if SHADER_API_OPENGL || SHADER_API_GLES || SHADER_API_GLES3
+        //GL with reversed z => z clip range is [near, -far] -> should remap in theory but dont do it in practice to save some perf (range is close enough)
+        #define UNITY_Z_0_FAR_FROM_CLIPSPACE(coord) max(-(coord), 0)
+    #else
+        //D3d with reversed Z => z clip range is [near, 0] -> remapping to [0, far]
+        //max is required to protect ourselves from near plane not being correct/meaningfull in case of oblique matrices.
+        #define UNITY_Z_0_FAR_FROM_CLIPSPACE(coord) max(((1.0-(coord)/_ProjectionParams.y)*_ProjectionParams.z),0)
     #endif
 #elif UNITY_UV_STARTS_AT_TOP
     //D3d without reversed z => z clip range is [0, far] -> nothing to do