Project refactor, namespace cleanup, splitting UI/functionality.

src/Core/Runtime/TextureUtilProvider.cs

@@ -0,0 +1,160 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using UnityEngine;
+
+namespace UnityExplorer.Core.Runtime
+{
+    public abstract class TextureUtilProvider
+    {
+        public static TextureUtilProvider Instance;
+
+        public TextureUtilProvider()
+        {
+            Instance = this;
+        }
+
+        public abstract byte[] EncodeToPNG(Texture2D tex);
+
+        public abstract Texture2D NewTexture2D(int width, int height);
+
+        public abstract void Blit(Texture2D tex, RenderTexture rt);
+
+        public abstract bool LoadImage(Texture2D tex, byte[] data, bool markNonReadable);
+
+        public abstract Sprite CreateSprite(Texture2D texture);
+
+        public static bool IsReadable(Texture2D tex)
+        {
+            try
+            {
+                // This will cause an exception if it's not readable.
+                // Reason for doing it this way is not all Unity versions
+                // ship with the 'Texture.isReadable' property.
+
+                tex.GetPixel(0, 0);
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public static bool LoadImage(Texture2D tex, string filePath, bool markNonReadable)
+        {
+            if (!File.Exists(filePath))
+                return false;
+
+            return Instance.LoadImage(tex, File.ReadAllBytes(filePath), markNonReadable);
+        }
+
+        public static Texture2D Copy(Texture2D orig, Rect rect)
+        {
+            Color[] pixels;
+
+            if (IsReadable(orig))
+                orig = ForceReadTexture(orig);
+
+            pixels = orig.GetPixels((int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height);
+
+            Texture2D newTex = Instance.NewTexture2D((int)rect.width, (int)rect.height);
+
+            newTex.SetPixels(pixels);
+
+            return newTex;
+        }
+
+        public static Texture2D ForceReadTexture(Texture2D tex)
+        {
+            try
+            {
+                FilterMode origFilter = tex.filterMode;
+                tex.filterMode = FilterMode.Point;
+
+                var rt = RenderTexture.GetTemporary(tex.width, tex.height, 0, RenderTextureFormat.ARGB32);
+                rt.filterMode = FilterMode.Point;
+                RenderTexture.active = rt;
+
+                Instance.Blit(tex, rt);
+
+                var _newTex = new Texture2D(tex.width, tex.height, TextureFormat.ARGB32, false);
+
+                _newTex.ReadPixels(new Rect(0, 0, tex.width, tex.height), 0, 0);
+                _newTex.Apply(false, false);
+
+                RenderTexture.active = null;
+                tex.filterMode = origFilter;
+
+                return _newTex;
+            }
+            catch (Exception e)
+            {
+                ExplorerCore.Log("Exception on ForceReadTexture: " + e.ToString());
+                return default;
+            }
+        }
+
+        public static void SaveTextureAsPNG(Texture2D tex, string dir, string name, bool isDTXnmNormal = false)
+        {
+            if (!Directory.Exists(dir))
+                Directory.CreateDirectory(dir);
+
+            byte[] data;
+            string savepath = dir + @"\" + name + ".png";
+
+            // Make sure we can EncodeToPNG it.
+            if (tex.format != TextureFormat.ARGB32 || !IsReadable(tex))
+            {
+                tex = ForceReadTexture(tex);
+            }
+
+            if (isDTXnmNormal)
+            {
+                tex = DTXnmToRGBA(tex);
+                tex.Apply(false, false);
+            }
+
+            data = Instance.EncodeToPNG(tex);
+
+            if (data == null || !data.Any())
+            {
+                ExplorerCore.LogWarning("Couldn't get any data for the texture!");
+            }
+            else
+            {
+                File.WriteAllBytes(savepath, data);
+            }
+        }
+
+        // Converts DTXnm-format Normal Map to RGBA-format Normal Map.
+        public static Texture2D DTXnmToRGBA(Texture2D tex)
+        {
+            Color[] colors = tex.GetPixels();
+
+            for (int i = 0; i < colors.Length; i++)
+            {
+                var c = colors[i];
+
+                c.r = c.a * 2 - 1;  // red <- alpha
+                c.g = c.g * 2 - 1;  // green is always the same
+
+                var rg = new Vector2(c.r, c.g); //this is the red-green vector
+                c.b = Mathf.Sqrt(1 - Mathf.Clamp01(Vector2.Dot(rg, rg))); //recalculate the blue channel
+
+                colors[i] = new Color(
+                    (c.r * 0.5f) + 0.5f,
+                    (c.g * 0.5f) + 0.25f,
+                    (c.b * 0.5f) + 0.5f
+                );
+            }
+
+            var newtex = new Texture2D(tex.width, tex.height, TextureFormat.ARGB32, false);
+            newtex.SetPixels(colors);
+
+            return newtex;
+        }
+    }
+}