noise-utilities/Runtime/NoiseGenerator.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;

namespace KairoEngine.NoiseUtilities
{
    public enum NoiseBlendingModes
    {
        Blend,
        Addictive,
        Subtractive
    }

    [System.Serializable]
    public class NoiseGenerator
    {
        [HorizontalGroup("Slpit", 80, MarginRight = 15), VerticalGroup("Slpit/Preview"), PreviewField(80, ObjectFieldAlignment.Left), HideLabel]
        public Texture2D texture;
        [HorizontalGroup("Slpit"), VerticalGroup("Slpit/Config"), LabelWidth(80), OnValueChanged("OnChange")] public float scale = 1f;
        [HorizontalGroup("Slpit"), VerticalGroup("Slpit/Config"), LabelWidth(80), OnValueChanged("OnChange")] public Vector2 offset = new Vector2();
        [HorizontalGroup("Slpit"), VerticalGroup("Slpit/Config"), LabelWidth(80), Range(0, 1f), OnValueChanged("OnChange")] public float opacity = 1f;
        [HorizontalGroup("Slpit"), VerticalGroup("Slpit/Config"), LabelWidth(80), OnValueChanged("OnChange")] public NoiseBlendingModes blending = NoiseBlendingModes.Blend;
        [HorizontalGroup("Slpit"), VerticalGroup("Slpit/Config"), LabelWidth(80), HideInInspector] public Vector2Int size = new Vector2Int(128, 128);
        [HideInInspector] public Vector2 randomOffset = new Vector2();

        [HideInInspector] public System.Action OnChangeDelegate;

        public NoiseGenerator()
        {
            this.size = new Vector2Int(128, 128);;
            this.scale = 1f;
            this.offset = new Vector2();
            this.opacity = 1f;
            //GenerateTexture(); // Disabled to fix weird bug when unity starts
        }

        public float SamplePoint(float x, float y)
        {
            float xCoord = (x * scale) + offset.x + randomOffset.x;
            float yCoord = (y * scale) + offset.y + randomOffset.y;
            return Mathf.PerlinNoise(xCoord, yCoord);
        }

        public float SamplePixel(int x, int y)
        {
            float xCoord = (((float)x / size.x) * scale) + offset.x + randomOffset.x;
            float yCoord = (((float)y / size.y) * scale) + offset.y + randomOffset.y;
            return Mathf.PerlinNoise(xCoord, yCoord);
        }

        //[HorizontalGroup("Slpit"), VerticalGroup("Slpit/Preview"), Button("Preview")]
        public void GenerateTexture()
        {
            var newTexture = new Texture2D(size.x, size.y);
            for (int x = 0; x < size.x; x++)
            {
                for (int y = 0; y < size.y; y++)
                {
                    float sample = SamplePixel(x, y);
                    Color color = new Color(sample, sample, sample);
                    newTexture.SetPixel(x, y, color);
                }
            }
            newTexture.Apply();
            texture = newTexture;
        }

        private void OnChange()
        {
            GenerateTexture();
            if(OnChangeDelegate != null) OnChangeDelegate();
        }
    }
}