using System.Collections;
using System.Collections.Generic;
using Godot;
using System;
using System.Threading.Tasks;



namespace Rokojori
{
  /** <summary for="class PackedSceneFoliageData">
      
      <title>
        A node to render foliage.
      </title>
      
      <description>
        The GrassPatch has various settings to create a different styles of grass.
        It allows to change the shapes of the blades, their number and distribution, their triangle count,
        rotation and scale, LOD levels and much more. 
        

      </description>

    </summary>  
  */

  [Tool]
  [GlobalClass]
  public partial class MeshInstanceFoliageData:FoliageData
  { 
    [Export]
    public NodePath meshInstanceReference;

    public override void Initialize( FoliageRenderLayer renderLayer )
    {
      var particles = renderLayer.renderer.CreateChild<GpuParticles3D>();

      renderLayer.gpuParticles3D = particles;

      var processMaterial = new GPUFoliageShaderMaterial();
      particles.ProcessMaterial = processMaterial;
      particles.Lifetime = 0.01f;
      particles.Explosiveness = 1f;
      particles.FixedFps = 0;
      particles.Interpolate = false;
      particles.FractDelta = false;

      particles.CustomAabb = Box3.WithSize( 10000 );
      

      processMaterial.positionVariance.Set( renderLayer.renderer.noise );
      processMaterial.rotationVariance.Set( renderLayer.renderer.noise );
      processMaterial.scaleVariance.Set( renderLayer.renderer.noise );
      processMaterial.occupancyVariance.Set( renderLayer.renderer.noise );

      renderLayer.gpuFoliageShaderMaterial = processMaterial;

      var meshInstance = renderLayer.renderer.GetNode( meshInstanceReference ) as MeshInstance3D;

      particles.DrawPasses = 1;
      particles.DrawPass1 = meshInstance.Mesh;

      particles.CastShadow = GeometryInstance3D.ShadowCastingSetting.Off;

    }
  }
}