How to cover a cube with a (tiled) texture by code

const float4x4 matWorldViewProj;
const float4x4 matWorld;
const float4 vecSunDir;
float4 vecSkill41;

texture entSkin1;

sampler ColorMapSampler = sampler_state 
{ 
   Texture = <entSkin1>; 
   AddressU  = Wrap; 
   AddressV  = Wrap; 
}; 
    
void DiffuseVS( 
   in float4 InPos: POSITION, 
   in float3 InNormal: NORMAL, 
   in float2 InTex: TEXCOORD0, 
   out float4 OutPos: POSITION, 
   out float3 OutTex: TEXCOORD0, 
   out float3 OutNormal: TEXCOORD1,
   out float3 OutNormal2: TEXCOORD2) 
{ 
   OutPos = mul(InPos, matWorldViewProj); 
   OutNormal = mul(InNormal, matWorld);
   OutNormal2 = InNormal;
   OutTex = InPos.xyz*vecSkill41.x+vecSkill41.yzw;
} 
    
float4 DiffusePS( 
   in float3 InTex: TEXCOORD0, 
   in float3 InNormal: TEXCOORD1,
   in float3 InNormal2: TEXCOORD2): COLOR 
{ 
	InNormal = normalize(InNormal);
   
   float Diffuse = saturate(dot(-vecSunDir, InNormal)*2)*0.5+0.5; 
   
   float4 Color = tex2D(ColorMapSampler, InTex.xy)*InNormal2.z*InNormal2.z; 
   Color += tex2D(ColorMapSampler, InTex.xz+0.333)*InNormal2.y*InNormal2.y; 
   Color += tex2D(ColorMapSampler, InTex.yz+0.667)*InNormal2.x*InNormal2.x; 
   
   float4 final = Color*Diffuse;
  
   return final; 
} 
 

technique DiffuseTechnique 
{ 
   pass P0 
   { 
      VertexShader = compile vs_2_0 DiffuseVS(); 
      PixelShader  = compile ps_2_0 DiffusePS(); 
   } 
}