UICustomBlend.cs

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using UnityEngine;
using UnityEngine.Rendering;
 
namespace Applibot;
 
public class UICustomBlend : CustomImageBase
{
    public enum MyCustomBlendMode : byte
    {
        Normal,
        LinearDodge,
        Darken,
        Multiply,
        Subtract,
        Lighten
    }
 
    [SerializeField]
    private MyCustomBlendMode _blendMode;
 
    private readonly int _SrcFactor = Shader.PropertyToID("_SrcFactor");
 
    private readonly int _DstFactor = Shader.PropertyToID("_DstFactor");
 
    private readonly int _BlendOp = Shader.PropertyToID("_BlendOp");
 
    protected override void UpdateMaterial(Material baseMaterial)
    {
        if (material == null)
        {
            material = new Material(Shader.Find("Applibot/UI/CustomBlend"));
            material.hideFlags = HideFlags.HideAndDontSave;
        }
        material.enabledKeywords = new LocalKeyword[0];
        switch (_blendMode)
        {
        case MyCustomBlendMode.Normal:
            material.SetInt(_SrcFactor, 1);
            material.SetInt(_DstFactor, 10);
            material.SetInt(_BlendOp, 0);
            break;
        case MyCustomBlendMode.LinearDodge:
            material.SetInt(_SrcFactor, 5);
            material.SetInt(_DstFactor, 1);
            material.SetInt(_BlendOp, 0);
            break;
        case MyCustomBlendMode.Multiply:
            material.SetInt(_SrcFactor, 0);
            material.SetInt(_DstFactor, 3);
            material.SetInt(_BlendOp, 0);
            break;
        case MyCustomBlendMode.Darken:
            material.SetInt(_SrcFactor, 1);
            material.SetInt(_DstFactor, 1);
            material.SetInt(_BlendOp, 3);
            break;
        case MyCustomBlendMode.Subtract:
            material.SetInt(_SrcFactor, 1);
            material.SetInt(_DstFactor, 1);
            material.SetInt(_BlendOp, 2);
            break;
        case MyCustomBlendMode.Lighten:
            material.SetInt(_SrcFactor, 1);
            material.SetInt(_DstFactor, 1);
            material.SetInt(_BlendOp, 4);
            break;
        }
        material.EnableKeyword(_blendMode.ToString());
    }
}