Brick Shader

#define IN_HLSL
#include "shdrConsts.h"
//-----------------------------------------------------------------------------
// Constants
//-----------------------------------------------------------------------------
struct VertData
{
	float4 position        : POSITION;
    float4 texCoord        : TEXCOORD0;
    float2 altCoord          : TEXCOORD1;
};


struct Conn
{
   float4 HPOS              : POSITION;
   float2 outTexCoord       : TEXCOORD0;
   float2 altCoord          : TEXCOORD1;
};


//-----------------------------------------------------------------------------
// Main
//-----------------------------------------------------------------------------
Conn main( VertData In, uniform float4x4 modelview : register(VC_WORLD_PROJ),
			            uniform float4x4 texMat    : register(VC_TEX_TRANS1)
)
{
   Conn Out;
  Out.HPOS      = mul(modelview, In.position);
  Out.outTexCoord = mul(texMat, In.texCoord);
  Out.altCoord  =  mul(texMat, In.texCoord);
  return Out;
}

//-----------------------------------------------------------------------------
// Structures                                                                  
//-----------------------------------------------------------------------------
struct ConnectData
{
   float2 texCoord          : TEXCOORD0;
   float2 altCoord          : TEXCOORD1;
};

struct Fragout
{
   float4 col : COLOR0;
};


//-----------------------------------------------------------------------------
// Main                                                                        
//-----------------------------------------------------------------------------
Fragout main(ConnectData IN,  uniform sampler2D baseTex      : register(S0)
)
{

   Fragout OUT;
   float2 altTex = IN.altCoord;
   
   float4 brickColor  = {0.5, 0.15, 0.1, 1.0 };
   float4 mortarColor = {0.5, 0.5, 0.5, 1.0 };
 	float width = 0.25;
	float height = 0.1; 
	float mortar = 0.01;

	float row = altTex[1] / height;

	float u_texCoor = altTex[0];
	
	if(row % 2 == 0)
		u_texCoor += width/2;
		
	float colu = u_texCoor /width;
	
	float2 brickCoord;
	brickCoord[0] = u_texCoor % width ;
	brickCoord[1] = altTex[1] % height;
	float4 col = brickColor;
	if(brickCoord[0] < mortar || brickCoord[1] < mortar)
		col = mortarColor;

 
 
   float4 diffuseColor = tex2D( baseTex, IN.texCoord );
   OUT.col = diffuseColor * col;
   return OUT;
}