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Shader "Hidden/ftUVNormalMap"
{
Properties
{
_BumpMap ("Normal map", 2D) = "bump" { }
bestFitNormalMap ("Best fit normals texture", 2D) = "white" { }
}
SubShader
{
Pass
{
//Name "META"
//Tags {"LightMode"="Meta"}
Cull Off
CGPROGRAM
#define _TANGENT_TO_WORLD
#define UNITY_PASS_META
#include "UnityStandardMeta.cginc"
Texture2D bestFitNormalMap;
//sampler2D _BumpMap;
float4 _BumpMap_scaleOffset;
float _IsTerrain, _IsPerPixel;
struct v2f_meta2
{
float4 pos : SV_POSITION;
float2 uv : TEXCOORD0;
float3 normal : TEXCOORD1;
float4 tangent : TEXCOORD2;
float3 binormal : TEXCOORD3;
};
v2f_meta2 vert_meta2 (VertexInput v)
{
v2f_meta2 o;
o.pos = float4(((v.uv1.xy * unity_LightmapST.xy + unity_LightmapST.zw)*2-1) * float2(1,-1), 0.5, 1);
// UnityMetaVertexPosition(v.vertex, v.uv1.xy, v.uv2.xy, unity_LightmapST, unity_DynamicLightmapST);
o.uv = v.uv0 * _BumpMap_scaleOffset.xy + _BumpMap_scaleOffset.zw;
o.normal = normalize(mul((float3x3)unity_ObjectToWorld, v.normal).xyz);
if (_IsTerrain == 0.0f)
{
o.tangent.xyz = normalize(mul((float3x3)unity_ObjectToWorld, v.tangent.xyz).xyz);
o.binormal = cross(o.normal, o.tangent.xyz) * v.tangent.w;
o.tangent.w = v.tangent.w;
}
else
{
o.tangent.xyz = cross(o.normal, float3(0,0,1));
o.binormal = cross(o.normal, o.tangent.xyz) * -1;
o.tangent.w = -1;
}
return o;
}
float3 EncodeNormalBestFit(float3 n)
{
float3 nU = abs(n);
float maxNAbs = max(nU.z, max(nU.x, nU.y));
float2 TC = nU.z<maxNAbs? (nU.y<maxNAbs? nU.yz : nU.xz) : nU.xy;
//if (TC.x != TC.y)
//{
TC = TC.x<TC.y? TC.yx : TC.xy;
TC.y /= TC.x;
n /= maxNAbs;
float fittingScale = bestFitNormalMap.Load(int3(TC.x*1023, TC.y*1023, 0)).a;
n *= fittingScale;
//}
return n*0.5+0.5;
}
float4 frag_meta2 (v2f_meta2 i): SV_Target
{
if (_IsPerPixel > 0.0f) i.binormal = cross(i.normal, i.tangent) * i.tangent.w;
float3 normalMap = UnpackNormal(tex2D(_BumpMap, i.uv));
float3 normal = normalize(i.tangent.xyz * normalMap.x + i.binormal * normalMap.y + i.normal * normalMap.z);
return float4(EncodeNormalBestFit(normal),1);
}
#pragma vertex vert_meta2
#pragma fragment frag_meta2
ENDCG
}
}
}
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