struct fragmentIN 
{
  float4 HPosition : POSITION;
  float4 TexCoord : TEXCOORD0;
};

struct fragmentOUT 
{
  float4 Color : COLOR;
};

fragmentOUT main(
  fragmentIN IN,

  uniform sampler2D channel1,
  uniform sampler2D channel2,
  uniform float w1,
  uniform float w2,
  uniform float redoffset1,
  uniform float redoffset2

) 
{
  fragmentOUT OUT;

  float2 tex = IN.TexCoord.xy;
  float4 col1, col2;
  col1 = f4tex2D(channel1, tex*32);
  col2 = f4tex2D(channel2, tex*32);

  col1.r = col1.r + redoffset1.r;
  col2.r = col2.r + redoffset2.r;


  OUT.Color.rgb = col1 * w1 + col2 * w2;
  OUT.Color.a = col1.a * w1 + col2.a * w2;


  return OUT;
}