Using Two Detail Textures On Atlas

float2  detCoord2         : TEXCOORD3;

struct ConnectData
{
   float4 hpos      : POSITION;
   float2 detCoord  : TEXCOORD0;
   float3  fade     : TEXCOORD1;
   float2 detCoord2  : TEXCOORD3;   
};

struct Fragout
{
   float4 col : COLOR0;
};

Fragout main( ConnectData IN,
              uniform sampler2D detMap          : register(S0),
              uniform sampler2D detMap2         : register(S3)              
              )
{
   Fragout OUT;
   
   float4 diff = (tex2D(detMap, IN.detCoord) * tex2D(detMap2, IN.detCoord2)) * 0.6 + 0.2;
   
   OUT.col = lerp(float4(0.5, 0.5, 0.5, 0.5), diff, IN.fade.x);
   return OUT;
}

#define IN_HLSL
#include "../shdrConsts.h"
#include "atlas.h"

//-----------------------------------------------------------------------------
// Main
//-----------------------------------------------------------------------------
VertDetailConnectData main( VertData IN,
                  uniform float4x4 modelView : register(C0),
                  uniform float3   eyePos    : register(VC_EYE_POS),
                  uniform float    morphT    : register(C49),
                  uniform float3   detData   : register(C50)
                  )
{
   VertDetailConnectData OUT;

   // Apply morph calculations.
   float4 realPos = IN.position + (IN.morphCoord * morphT);
   realPos.w = 1;

   // Transform and return.
   OUT.hpos = mul(modelView, realPos);
 
   // Do the detail map calculations.
   float eyeDist = distance( IN.position, eyePos );
   OUT.detCoord = IN.texCoord * detData.z;                 // Amplify texcoords.
   OUT.detCoord2 = IN.texCoord * (detData.z * 0.1);   // 10% resolution

   OUT.fade.x     = 1.0 - (eyeDist - detData.x) * detData.y; // And fade with distance.
   OUT.fade.yz    = 0.f;
   
   return OUT;
}