using Godot;
using System;

using Rokojori.Extensions;
namespace Rokojori
{
  public class HeightMapRibbonShader
  {
    public static readonly CachedResource<Shader> shader = new CachedResource<Shader>(
      "res://addons/rokojori_action_library/Runtime/Procedural/HeightMaps/Shaders/HeightMapRibbon.gdshader"
    );

    public static readonly Vector4PropertyName region = Vector4PropertyName.Create( "ribbon_region" );
  }

  /** Material for HeightMapRibbon.gdshader.

      One per ribbon rather than one shared, because the region clip has to be
      per ribbon - see the shader. Everything else the pass writes comes off the
      mesh's own vertex attributes.
  */
  [Tool]
  public partial class HeightMapRibbonMaterial:CustomMaterial
  {
    public readonly CustomMaterialProperty<Vector4> region;

    public HeightMapRibbonMaterial()
    {
      Shader = HeightMapRibbonShader.shader.Get();

      region = new CustomMaterialProperty<Vector4>( this, HeightMapRibbonShader.region );
    }

    public void SetRegion( Rect2I rect )
    {
      region.Set( new Vector4( rect.Position.X, rect.Position.Y, rect.Size.X, rect.Size.Y ) );
    }
  }
}