How to pass texture to ComputeColor shader

[zver322]

Hi everyone, my name is Lev and I'm struggling with a problem.
I'm creating a custom terrain (the same is TR.Stride). I'm doing the same thing as in
Terrain_Blend_Height.sdsl shader. I have main material and some layers on it. For each layer I set same ComputeColor shader which returns float4(1, 0, 0, 0) based on Texture coordinate color. When I try to pass a texture a get an error on material.
Here is my code:
shader MaterialGeneration : ComputeColor, PositionStream4 {
compose ComputeColor R;
compose ComputeColor G;
compose ComputeColor B;
compose ComputeColor terrainSize;
compose ComputeColor textureHeight;
compose ComputeColor textureWidth;
override float4 Compute() {
//Texture.xy == float4(1, 0, 0, 0);
float2 mapCoordinates = float2(streams.Position.x, streams.Position.z);
mapCoordinates.x = mapCoordinates.x * textureWidth.Compute().x / terrainSize.Compute().x;
mapCoordinates.Y = mapCoordinates.y * textureHeight.Compute().x / terrainSize.Compute().x;
mapCoordinates += float2(textureWidth.Compute().x / 2, textureHeight.Compute().x / 2);
if (Texture[int(mapCoordinates.x), int(mapCoordinates.Y)] == float4(R.Compute().x, G.Compute().x, B.Compute().x,1))
return float4(1, 0, 0, 0);
return float4(0, 0, 0, 0);
}
};

I'm passing texture from game studio, so does anyone have and Idea how I can rework my shader. My shader need to get Texture from game studio and then return float based on coordinates color.