void main
(
  float2 iTexCoord0 : TEXCOORD0,
 
  out float4 oColor : COLOR,
 
  uniform float splatScaleX,
  uniform float splatScaleZ,
  uniform sampler2D covMap,
  uniform sampler2D splat1,
  uniform sampler2D splat2,
  uniform sampler2D splat3
) 
{
  float3 cov = tex2D(covMap, iTexCoord0).rgb;
  iTexCoord0.x *= splatScaleX;
  iTexCoord0.y *= splatScaleZ;
  oColor = tex2D(splat1, iTexCoord0) * cov.x
          + tex2D(splat2, iTexCoord0) * cov.y
          + tex2D(splat3, iTexCoord0) * cov.z;
}