水面shader 线性擦除

// Upgrade NOTE: replaced 'PositionFog()' with multiply of UNITY_MATRIX_MVP by position
// Upgrade NOTE: replaced 'V2F_POS_FOG' with 'float4 pos : SV_POSITION'
// Upgrade NOTE: replaced 'defined HAS_REFLECTION' with 'defined (HAS_REFLECTION)'
// Upgrade NOTE: replaced 'defined HAS_REFRACTION' with 'defined (HAS_REFRACTION)'
// Upgrade NOTE: replaced 'defined WATER_REFLECTIVE' with 'defined (WATER_REFLECTIVE)'
// Upgrade NOTE: replaced 'defined WATER_REFRACTIVE' with 'defined (WATER_REFRACTIVE)'
// Upgrade NOTE: replaced 'defined WATER_SIMPLE' with 'defined (WATER_SIMPLE)'

Shader "FX/Water" {

    Properties {

    _WaveScale ("Wave scale", Range (0.02,0.15)) = 0.063

    _ReflDistort ("Reflection distort", Range (,1.5)) = 0.44

    _RefrDistort ("Refraction distort", Range (,1.5)) = 0.40

    _RefrColor ("Refraction color", COLOR) = ( ., ., ., )

    _Fresnel ("Fresnel (A) ", 2D) = "gray" {}

    _BumpMap ("Bumpmap (RGB) ", 2D) = "bump" {}

    WaveSpeed ("Wave speed (map1 x,y; map2 x,y)", Vector) = (,,-,-)

    _ReflectiveColor ("Reflective color (RGB) fresnel (A) ", 2D) = "" {}

    _ReflectiveColorCube ("Reflective color cube (RGB) fresnel (A)", Cube) = "" { TexGen CubeReflect }

    _HorizonColor ("Simple water horizon color", COLOR) = ( ., ., ., )

    _MainTex ("Fallback texture", 2D) = "" {}

    _ReflectionTex ("Internal Reflection", 2D) = "" {}

    _RefractionTex ("Internal Refraction", 2D) = "" {}

    }

    // -----------------------------------------------------------

    // Fragment program cards

    Subshader {

    Tags { "WaterMode"="Refractive" "RenderType"="Opaque" }

    Pass {

    CGPROGRAM
// Upgrade NOTE: excluded shader from OpenGL ES 2.0 because it uses non-square matrices
#pragma exclude_renderers gles
// Upgrade NOTE: excluded shader from DX11 and Xbox360; has structs without semantics (struct v2f members ref,bumpuv,viewDir)
#pragma exclude_renderers d3d11 xbox360

    #pragma vertex vert

    #pragma fragment frag

    #pragma fragmentoption ARB_precision_hint_fastest

    #pragma fragmentoption ARB_fog_exp2

    #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;

    #ifdef HAS_REFLECTION

    uniform float _ReflDistort;

    #endif

    #ifdef 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)

    float3 ref;

    #endif

    float2 bumpuv[];

    float3 viewDir;

    };

    v2f vert(appdata v)

    {

    v2f o;

    o.pos = mul (UNITY_MATRIX_MVP, v.vertex);

    // scroll bump waves

    float4 temp;

    temp.xyzw = v.vertex.xzxz * _WaveScale4 + _WaveOffset;

    o.bumpuv[] = temp.xy;

    o.bumpuv[] = temp.wz;

    // object space view direction (will normalize per pixel)

    o.viewDir.xzy = ObjSpaceViewDir(v.vertex);

    #if defined (HAS_REFLECTION) || defined (HAS_REFRACTION)

    // calculate the reflection vector

    float3x4 mat = float3x4 (

    0.5, , , 0.5,

    , 0.5 * _ProjectionParams.x, , 0.5,

    , , , 

    );

    o.ref = mul (mat, o.pos);

    #endif

    return o;

    }

    #if defined (WATER_REFLECTIVE) || defined (WATER_REFRACTIVE)

    sampler2D _ReflectionTex;

    #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 ) : COLOR

    {

    i.viewDir = normalize(i.viewDir);

    // combine two scrolling bumpmaps into one

    half3 bump1 = tex2D( _BumpMap, i.bumpuv[] ).rgb;

    half3 bump2 = tex2D( _BumpMap, i.bumpuv[] ).rgb;

    half3 bump = bump1 + bump2 - ;

    // fresnel factor

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

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

    #ifdef HAS_REFLECTION

    float3 uv1 = i.ref; uv1.xy += bump * _ReflDistort;

    half4 refl = tex2Dproj( _ReflectionTex, uv1 );

    #endif

    #ifdef HAS_REFRACTION

    float3 uv2 = i.ref; uv2.xy -= bump * _RefrDistort;

    half4 refr = tex2Dproj( _RefractionTex, uv2 ) * _RefrColor;

    #endif

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

    half4 color;

    #ifdef WATER_REFRACTIVE

    half fresnel = tex2D( _Fresnel, float2(fresnelFac,fresnelFac) ).a;

    color = lerp( refr, refl, fresnel );

    #endif

    #ifdef 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

    #ifdef WATER_SIMPLE

    half4 water = tex2D( _ReflectiveColor, float2(fresnelFac,fresnelFac) );

    color.rgb = lerp( water.rgb, _HorizonColor.rgb, water.a );

    color.a = _HorizonColor.a;

    #endif

    return color;

    }

    ENDCG

    }

    }

    // -----------------------------------------------------------

    // Radeon 9000 cards

    #warning Upgrade NOTE: SubShader commented out because of manual shader assembly
/*Subshader {

    Tags { "WaterMode"="Reflective" "RenderType"="Opaque" }

    Pass {

    CGPROGRAM
// Upgrade NOTE: excluded shader from OpenGL ES 2.0 because it does not contain a surface program or both vertex and fragment programs.
#pragma exclude_renderers gles

    #pragma vertex vert

    #include "UnityCG.cginc"

    uniform float4 _WaveScale4;

    uniform float4 _WaveOffset;

    uniform float _ReflDistort;

    struct appdata {

    float4 vertex : POSITION;

    float3 normal : NORMAL;

    };

    struct v2f {

    float4 pos : SV_POSITION;

    float2 bumpuv[2] : TEXCOORD0;

    float3 viewDir : TEXCOORD2;

    float4 ref : TEXCOORD3;

    };

    v2f vert(appdata v)

    {

    v2f o;

    o.pos = mul (UNITY_MATRIX_MVP, v.vertex);

    // scroll bump waves

    float4 temp;

    temp.xyzw = v.vertex.xzxz * _WaveScale4 + _WaveOffset;

    o.bumpuv[0] = temp.xy;

    o.bumpuv[1] = temp.wz;

    // object space view direction

    o.viewDir.xzy = normalize( ObjSpaceViewDir(v.vertex) );

    // calculate the reflection vector

    float4x4 mat = float4x4 (

    .5, 0, 0,.5,

    0,.5 * _ProjectionParams.x, 0,.5,

    0, 0,.5,.5,

    0, 0, 0, 1

    );

    o.ref = mul (mat, o.pos);

    return o;

    }   //Unity3D教程手册：www.unitymanual.com

    ENDCG

    Program "" {

    SubProgram {

    Keywords { "WATER_REFLECTIVE" "WATER_REFRACTIVE" }

    SetTexture [_BumpMap] { 2D }

    SetTexture [_BumpMap] { 2D }

    SetTexture [_ReflectiveColor] { 2D }

    SetTexture [_ReflectionTex] { 2D }

    Local 0, ([_ReflDistort],0,0,0)

    "!!ATIfs1.0

    StartConstants;

    CONSTANT c0 = program.local[0];

    EndConstants;

    StartPrelimPass;

    PassTexCoord r3, t3.stq_dq; # reflection vector

    SampleMap r0, t0.str; # bump1

    SampleMap r1, t1.str; # bump2

    PassTexCoord r2, t2.str;

    ADD r1.half, r0.bias, r1.bias; # bump = bump1 + bump2 - 1

    DOT3 r2, r1.2x, r2;     # fresnel: dot (bump, viewer-pos)

    # add less offset because it's purely screenspace; big ones look bad

    MAD r3.rg, r1, c0.r, r3;   # uv += bump * strength; add less because it's not perspective

    EndPass;

    StartOutputPass;

    SampleMap r3, r3.str;   # reflection color

    SampleMap r2, r2.str;   # water color/fresnel

    LERP r0.rgb, r2.a, r3, r2; # between water and reflected based on fresnel

    MUL r0.a, r3.a, r2.a;

    EndPass;

    "

    }

    SubProgram {

    Keywords { "WATER_SIMPLE" }

    SetTexture [_BumpMap] { 2D }

    SetTexture [_BumpMap] { 2D }

    SetTexture [_ReflectiveColor] { 2D }

    Local 0, [_HorizonColor]

    "!!ATIfs1.0

    StartConstants;

    CONSTANT c0 = program.local[0];

    EndConstants;

    StartPrelimPass;

    SampleMap r0, t0.str;

    SampleMap r1, t1.str;

    PassTexCoord r2, t2.str;

    ADD r1, r0.bias, r1.bias; # bump = bump1 + bump2 - 1

    DOT3 r2, r1, r2;    # fresnel: dot (bump, viewer-pos)

    EndPass;

    StartOutputPass;

    SampleMap r2, r2.str;

    LERP r0.rgb, r2.a, c0, r2; # fade in reflection

    MOV r0.a, c0.a;

    EndPass;

    "

    }

    }

    }

    }*/

    // -----------------------------------------------------------

    // Old cards

    // three texture, cubemaps

    Subshader {

    Tags { "WaterMode"="Simple" "RenderType"="Opaque" }

    Pass {

    Color (0.5,0.5,0.5,0.5)

    SetTexture [_MainTex] {

    Matrix [_WaveMatrix]

    combine texture * primary

    }

    SetTexture [_MainTex] {

    Matrix [_WaveMatrix2]

    combine texture * primary + previous

    }

    SetTexture [_ReflectiveColorCube] {

    combine texture +- previous, primary

    Matrix [_Reflection]

    }

    }  //Unity3D教程：www.unitymanual.com

    }

    // dual texture, cubemaps

    Subshader {

    Tags { "WaterMode"="Simple" "RenderType"="Opaque" }

    Pass {

    Color (0.5,0.5,0.5,0.5)

    SetTexture [_MainTex] {

    Matrix [_WaveMatrix]

    combine texture

    }

    SetTexture [_ReflectiveColorCube] {

    combine texture +- previous, primary

    Matrix [_Reflection]

    }

    }

    }

    // single texture

    Subshader {

    Tags { "WaterMode"="Simple" "RenderType"="Opaque" }

    Pass {

    Color (0.5,0.5,0.5,)

    SetTexture [_MainTex] {

    Matrix [_WaveMatrix]

    combine texture, primary

    }

    }

    }

    }