float4 main(float2 texCoord: TEXCOORD0,
            uniform float angle,
            uniform sampler2D baseMap: TEXUNIT0) : COLOR
{
  float4 color = tex2D(baseMap, texCoord);
  float alpha = texCoord.x < angle ? 1.0 : 0.1;
  
  return float4(color.rgb, color.a * alpha);
}
