// Per pixel bumped refraction.
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// Uses a normal map to distort the image behind, and
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// an additional texture to tint the color.
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Shader "FX/Glass/Stained BumpDistort" {
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Properties {
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_BumpAmt ("Distortion", range (0,128)) = 10
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_MainTex ("Tint Color (RGB)", 2D) = "white" {}
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_BumpMap ("Normalmap", 2D) = "bump" {}
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}
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Category {
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// We must be transparent, so other objects are drawn before this one.
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Tags { "Queue"="Transparent" "RenderType"="Opaque" }
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SubShader {
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// This pass grabs the screen behind the object into a texture.
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// We can access the result in the next pass as _GrabTexture
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GrabPass {
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Name "BASE"
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Tags { "LightMode" = "Always" }
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}
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// Main pass: Take the texture grabbed above and use the bumpmap to perturb it
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// on to the screen
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Pass {
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Name "BASE"
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Tags { "LightMode" = "Always" }
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile_fog
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#include "UnityCG.cginc"
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struct appdata_t {
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float4 vertex : POSITION;
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float2 texcoord: TEXCOORD0;
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};
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struct v2f {
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float4 vertex : SV_POSITION;
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float4 uvgrab : TEXCOORD0;
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float2 uvbump : TEXCOORD1;
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float2 uvmain : TEXCOORD2;
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UNITY_FOG_COORDS(3)
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};
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float _BumpAmt;
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float4 _BumpMap_ST;
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float4 _MainTex_ST;
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v2f vert (appdata_t v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uvgrab = ComputeGrabScreenPos(o.vertex);
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o.uvbump = TRANSFORM_TEX( v.texcoord, _BumpMap );
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o.uvmain = TRANSFORM_TEX( v.texcoord, _MainTex );
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UNITY_TRANSFER_FOG(o,o.vertex);
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return o;
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}
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sampler2D _GrabTexture;
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float4 _GrabTexture_TexelSize;
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sampler2D _BumpMap;
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sampler2D _MainTex;
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half4 frag (v2f i) : SV_Target
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{
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#if UNITY_SINGLE_PASS_STEREO
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i.uvgrab.xy = TransformStereoScreenSpaceTex(i.uvgrab.xy, i.uvgrab.w);
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#endif
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// calculate perturbed coordinates
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half2 bump = UnpackNormal(tex2D( _BumpMap, i.uvbump )).rg; // we could optimize this by just reading the x & y without reconstructing the Z
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float2 offset = bump * _BumpAmt * _GrabTexture_TexelSize.xy;
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#ifdef UNITY_Z_0_FAR_FROM_CLIPSPACE //to handle recent standard asset package on older version of unity (before 5.5)
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i.uvgrab.xy = offset * UNITY_Z_0_FAR_FROM_CLIPSPACE(i.uvgrab.z) + i.uvgrab.xy;
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#else
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i.uvgrab.xy = offset * i.uvgrab.z + i.uvgrab.xy;
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#endif
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half4 col = tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(i.uvgrab));
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half4 tint = tex2D(_MainTex, i.uvmain);
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col *= tint;
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UNITY_APPLY_FOG(i.fogCoord, col);
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return col;
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}
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ENDCG
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}
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}
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// ------------------------------------------------------------------
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// Fallback for older cards and Unity non-Pro
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SubShader {
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Blend DstColor Zero
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Pass {
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Name "BASE"
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SetTexture [_MainTex] { combine texture }
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}
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}
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}
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}
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