Unity Water shader VR

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

Shader "FX/Water" {
Properties {
    _WaveScale ("Wave scale", Range (0.02,0.15)) = 0.063
    _ReflDistort ("Reflection distort", Range (0,1.5)) = 0.44
    _RefrDistort ("Refraction distort", Range (0,1.5)) = 0.40
    _RefrColor ("Refraction color", COLOR)  = ( .34, .85, .92, 1)
    [NoScaleOffset] _Fresnel ("Fresnel (A) ", 2D) = "gray" {}
    [NoScaleOffset] _BumpMap ("Normalmap ", 2D) = "bump" {}
    WaveSpeed ("Wave speed (map1 x,y; map2 x,y)", Vector) = (19,9,-16,-7)
    [NoScaleOffset] _ReflectiveColor ("Reflective color (RGB) fresnel (A) ", 2D) = "" {}
    _HorizonColor ("Simple water horizon color", COLOR)  = ( .172, .463, .435, 1)
    [HideInInspector] _ReflectionTex0 ("Internal Reflection", 2D) = "" {}
    [HideInInspector] _ReflectionTex1 ("Internal Reflection", 2D) = "" {}
    [HideInInspector] _RefractionTex ("Internal Refraction", 2D) = "" {}
}


// -----------------------------------------------------------
// Fragment program cards


Subshader {
    Tags { "WaterMode"="Refractive" "RenderType"="Opaque" }
    Pass {
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_fog
#pragma multi_compile WATER_REFRACTIVE WATER_REFLECTIVE WATER_SIMPLE

#if defined (WATER_REFLECTIVE) || defined (WATER_REFRACTIVE)
#define HAS_REFLECTION 1
#endif
#if defined (WATER_REFRACTIVE)
#define HAS_REFRACTION 1
#endif


#include "UnityCG.cginc"

uniform float4 _WaveScale4;
uniform float4 _WaveOffset;

#if HAS_REFLECTION
uniform float _ReflDistort;
#endif
#if HAS_REFRACTION
uniform float _RefrDistort;
#endif

struct appdata {
    float4 vertex : POSITION;
    float3 normal : NORMAL;
};

struct v2f {
    float4 pos : SV_POSITION;
    #if defined(HAS_REFLECTION) || defined(HAS_REFRACTION)
        float4 ref : TEXCOORD0;
        float2 bumpuv0 : TEXCOORD1;
        float2 bumpuv1 : TEXCOORD2;
        float3 viewDir : TEXCOORD3;
        float eyeIndex : TEXCOORD4;
        UNITY_FOG_COORDS(5)
    #else
        float2 bumpuv0 : TEXCOORD0;
        float2 bumpuv1 : TEXCOORD1;
        float3 viewDir : TEXCOORD2;
        UNITY_FOG_COORDS(3)
    #endif
};

v2f vert(appdata v)
{
    v2f o;
    o.pos = UnityObjectToClipPos (v.vertex);


    // scroll bump waves
    float4 temp;
    float4 wpos = mul (unity_ObjectToWorld, v.vertex);
    temp.xyzw = wpos.xzxz * _WaveScale4 + _WaveOffset;
    o.bumpuv0 = temp.xy;
    o.bumpuv1 = temp.wz;

    // object space view direction (will normalize per pixel)
    o.viewDir.xzy = WorldSpaceViewDir(v.vertex);

    #if defined(HAS_REFLECTION) || defined(HAS_REFRACTION)
    o.ref = ComputeNonStereoScreenPos(o.pos);

    #ifdef UNITY_SINGLE_PASS_STEREO
        o.eyeIndex = unity_StereoEyeIndex;
    #else
    // When not using single pass stereo rendering, eye index must be determined by testing the
    // sign of the horizontal skew of the projection matrix.
    if (unity_CameraProjection[0][2] > 0) {
        o.eyeIndex = 1.0;
    } else {
        o.eyeIndex = 0.0;
    }
    #endif
    #endif

    UNITY_TRANSFER_FOG(o,o.pos);
    return o;
}

#if defined (WATER_REFLECTIVE) || defined (WATER_REFRACTIVE)
sampler2D _ReflectionTex0;
sampler2D _ReflectionTex1;
#endif
#if defined (WATER_REFLECTIVE) || defined (WATER_SIMPLE)
sampler2D _ReflectiveColor;
#endif
#if defined (WATER_REFRACTIVE)
sampler2D _Fresnel;
sampler2D _RefractionTex;
uniform float4 _RefrColor;
#endif
#if defined (WATER_SIMPLE)
uniform float4 _HorizonColor;
#endif
sampler2D _BumpMap;

half4 frag( v2f i ) : SV_Target
{
    i.viewDir = normalize(i.viewDir);

    // combine two scrolling bumpmaps into one
    half3 bump1 = UnpackNormal(tex2D( _BumpMap, i.bumpuv0 )).rgb;
    half3 bump2 = UnpackNormal(tex2D( _BumpMap, i.bumpuv1 )).rgb;
    half3 bump = (bump1 + bump2) * 0.5;

    // fresnel factor
    half fresnelFac = dot( i.viewDir, bump );

    // perturb reflection/refraction UVs by bumpmap, and lookup colors

    #if HAS_REFLECTION
    float4 uv1 = i.ref; uv1.xy += bump * _ReflDistort;
    half4 refl0 = tex2Dproj( _ReflectionTex0, UNITY_PROJ_COORD(uv1) );
    half4 refl1 = tex2Dproj( _ReflectionTex1, UNITY_PROJ_COORD(uv1) );
    half4 refl = lerp(refl0, refl1, i.eyeIndex);
    #endif
    #if HAS_REFRACTION
    float4 uv2 = i.ref; uv2.xy -= bump * _RefrDistort;
    half4 refr = tex2Dproj( _RefractionTex, UNITY_PROJ_COORD(uv2) ) * _RefrColor;
    #endif

    // final color is between refracted and reflected based on fresnel
    half4 color;

    #if defined(WATER_REFRACTIVE)
    half fresnel = UNITY_SAMPLE_1CHANNEL( _Fresnel, float2(fresnelFac,fresnelFac) );
    color = lerp( refr, refl, fresnel );
    #endif

    #if defined(WATER_REFLECTIVE)
    half4 water = tex2D( _ReflectiveColor, float2(fresnelFac,fresnelFac) );
    color.rgb = lerp( water.rgb, refl.rgb, water.a );
    color.a = refl.a * water.a;
    #endif

    #if defined(WATER_SIMPLE)
    half4 water = tex2D( _ReflectiveColor, float2(fresnelFac,fresnelFac) );
    color.rgb = lerp( water.rgb, _HorizonColor.rgb, water.a );
    color.a = _HorizonColor.a;
    #endif

    UNITY_APPLY_FOG(i.fogCoord, color);
    return color;
}
ENDCG

    }
}

}