Added texture export options

Editor/QuantizedPreviewWindow.cs

@@ -1,3 +1,4 @@
+using System.IO;
 using UnityEditor;
 using UnityEngine;
 using UnityEngine.Rendering;
@@ -7,7 +8,7 @@ public class QuantizedPreviewWindow : EditorWindow
     private Texture2D originalTexture;
     private Texture2D quantizedTexture;
     private Texture2D vramTexture; // New VRAM Texture
-    private float[] clut; // Changed to 1D array
+    private ushort[] clut; // Changed to 1D array
     private ushort[] indexedPixelData; // New field for indexed pixel data
     private int bpp = 4;
     private int targetWidth = 128;
@@ -45,7 +46,7 @@ public class QuantizedPreviewWindow : EditorWindow
         {
             GUILayout.BeginVertical();
             GUILayout.Label("Original Texture");
-            DrawTexturePreview(originalTexture, previewSize);
+            DrawTexturePreview(originalTexture, previewSize, false);
             GUILayout.EndVertical();
         }
 
@@ -72,6 +73,58 @@ public class QuantizedPreviewWindow : EditorWindow
             GUILayout.Label("Color Lookup Table (CLUT)");
             DrawCLUT();
         }
+
+        GUILayout.Space(10);
+
+        if (indexedPixelData != null)
+        {
+            if (GUILayout.Button("Export pixel data"))
+            {
+                string path = EditorUtility.SaveFilePanel(
+                    "Save pixel data",
+                    "",
+                    "pixel_data",
+                    "bin"
+                );
+
+                if (!string.IsNullOrEmpty(path))
+                {
+                    using (FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write))
+                    using (BinaryWriter writer = new BinaryWriter(fileStream))
+                    {
+                        foreach (ushort value in indexedPixelData)
+                        {
+                            writer.Write(value);
+                        }
+                    }
+                }
+            }
+        }
+
+        if (clut != null)
+        {
+            if (GUILayout.Button("Export clut data"))
+            {
+                string path = EditorUtility.SaveFilePanel(
+                    "Save clut data",
+                    "",
+                    "clut_data",
+                    "bin"
+                );
+
+                if (!string.IsNullOrEmpty(path))
+                {
+                    using (FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write))
+                    using (BinaryWriter writer = new BinaryWriter(fileStream))
+                    {
+                        foreach (ushort value in clut)
+                        {
+                            writer.Write(value);
+                        }
+                    }
+                }
+            }
+        }
     }
 
     private void GenerateQuantizedPreview()
@@ -119,9 +172,14 @@ public class QuantizedPreviewWindow : EditorWindow
                     }
 
 
-                    Vector3 color = new Vector3(clut[index * 3], clut[index * 3 + 1], clut[index * 3 + 2]);
+                    Vector3 color = new Vector3(
+                        (clut[index] & 31) / 31.0f,         // Red: bits 0–4
+                        ((clut[index] >> 5) & 31) / 31.0f, // Green: bits 5–9
+                        ((clut[index] >> 10) & 31) / 31.0f // Blue: bits 10–14
+                    );
                     quantizedColors[y * resizedTexture.width + x] = new Color(color.x, color.y, color.z);
 
+
                     if ((x % pixelSize) == (pixelSize - 1))
                     {
                         pixelIndex++;
@@ -160,9 +218,9 @@ public class QuantizedPreviewWindow : EditorWindow
         {
             int index = indexedData[i];
 
-            float r = Mathf.Floor((index >> 11) & 31) / 31.0f; 
+            float r = (index & 31) / 31.0f;         // Red: bits 0–4
-            float g = Mathf.Floor((index >> 5) & 31) / 31.0f; 
+            float g = ((index >> 5) & 31) / 31.0f;  // Green: bits 5–9
-            float b = Mathf.Floor(index & 31) / 31.0f;
+            float b = ((index >> 10) & 31) / 31.0f; // Blue: bits 10–14
 
             vramColors[i] = new Color(r, g, b);
         }
@@ -174,6 +232,7 @@ public class QuantizedPreviewWindow : EditorWindow
     }
 
 
+
     private Texture2D ConvertTo16Bpp(Texture2D source)
     {
         int width = source.width;
@@ -187,7 +246,6 @@ public class QuantizedPreviewWindow : EditorWindow
         {
             Color pixel = originalPixels[i];
 
-            // Convert to 5 bits per channel (R5G5B5)
             float r = Mathf.Floor(pixel.r * 31) / 31.0f; // 5 bits for red
             float g = Mathf.Floor(pixel.g * 31) / 31.0f; // 5 bits for green
             float b = Mathf.Floor(pixel.b * 31) / 31.0f; // 5 bits for blue
@@ -201,10 +259,37 @@ public class QuantizedPreviewWindow : EditorWindow
         return convertedTexture;
     }
 
-    private void DrawTexturePreview(Texture2D texture, int size)
+    private void DrawTexturePreview(Texture2D texture, int size, bool flipY = true)
     {
         Rect rect = GUILayoutUtility.GetRect(size, size, GUILayout.ExpandWidth(false));
-        EditorGUI.DrawPreviewTexture(rect, texture, null, ScaleMode.ScaleToFit, 0, 0, ColorWriteMask.All);
+
+        // Flip the texture on the Y-axis
+        Texture2D displayedTexture = flipY ? FlipTextureY(texture) : texture;
+        EditorGUI.DrawPreviewTexture(rect, displayedTexture, null, ScaleMode.ScaleToFit, 0, 0, ColorWriteMask.All);
+    }
+
+    private Texture2D FlipTextureY(Texture2D texture)
+    {
+        Color[] originalPixels = texture.GetPixels();
+        Color[] flippedPixels = new Color[originalPixels.Length];
+
+        int width = texture.width;
+        int height = texture.height;
+
+        // Flip the pixels on the Y-axis
+        for (int y = 0; y < height; y++)
+        {
+            for (int x = 0; x < width; x++)
+            {
+                flippedPixels[(height - y - 1) * width + x] = originalPixels[y * width + x];
+            }
+        }
+
+        Texture2D flippedTexture = new Texture2D(width, height);
+        flippedTexture.SetPixels(flippedPixels);
+        flippedTexture.Apply();
+
+        return flippedTexture;
     }
 
     private void DrawCLUT()
@@ -216,7 +301,7 @@ public class QuantizedPreviewWindow : EditorWindow
 
         GUILayout.Space(10);
 
-        int totalColors = clut.Length / 3;
+        int totalColors = clut.Length;
         int totalRows = Mathf.CeilToInt((float)totalColors / maxColorsPerRow);
 
         for (int row = 0; row < totalRows; row++)
@@ -228,7 +313,13 @@ public class QuantizedPreviewWindow : EditorWindow
             for (int col = 0; col < colorsInRow; col++)
             {
                 int index = row * maxColorsPerRow + col;
-                Vector3 color = new Vector3(clut[index * 3], clut[index * 3 + 1], clut[index * 3 + 2]);
+
+                Vector3 color = new Vector3(
+                    (clut[index] & 31) / 31.0f,         // Red: bits 0–4
+                    ((clut[index] >> 5) & 31) / 31.0f, // Green: bits 5–9
+                    ((clut[index] >> 10) & 31) / 31.0f // Blue: bits 10–14
+                );
+
                 Rect rect = GUILayoutUtility.GetRect(swatchSize, swatchSize, GUILayout.ExpandWidth(false));
                 EditorGUI.DrawRect(rect, new Color(color.x, color.y, color.z));
             }
@@ -237,6 +328,7 @@ public class QuantizedPreviewWindow : EditorWindow
         }
     }
 
+
     private Texture2D ResizeTexture(Texture2D source, int newWidth, int newHeight)
     {
         RenderTexture rt = RenderTexture.GetTemporary(newWidth, newHeight);

Runtime/ImageQuantizer.cs

@@ -6,7 +6,7 @@ using Random = UnityEngine.Random;
 public class ImageQuantizer
 {
 
-    public static (ushort[], float[]) Quantize(Texture2D image, int bpp, int maxIterations = 10)
+    public static (ushort[], ushort[]) Quantize(Texture2D image, int bpp, int maxIterations = 10)
     {
         int width = image.width;
         int height = image.height;
@@ -73,17 +73,20 @@ public class ImageQuantizer
         ushort packIndex = 0;
         int bitShift = 0;
 
-        for (int i = 0; i < pixelColors.Length; i++)
+        // Loop through pixels and pack the data, flipping along the Y-axis
+        for (int y = height - 1; y >= 0; y--)
         {
-            ushort centroidIndex = assignments[i]; 
+            for (int x = 0; x < width; x++)
+            {
+                int pixelIndex = y * width + x;
+                ushort centroidIndex = assignments[pixelIndex];
 
                 // For 4bpp, we need to pack 4 indices into a single integer
                 if (bpp == 4)
                 {
-                pixelArray[packIndex] |= (ushort)(centroidIndex << (bitShift * 4));  // Shift by 4 bits for each index
+                    pixelArray[packIndex] |= (ushort)(centroidIndex << (bitShift * 4));
                     bitShift++;
 
-                // Every 4 indices, move to the next position in the pixelArray
                     if (bitShift == 4)
                     {
                         bitShift = 0;
@@ -93,10 +96,9 @@ public class ImageQuantizer
                 // For 8bpp, we need to pack 2 indices into a single integer
                 else if (bpp == 8)
                 {
-                pixelArray[packIndex] |= (ushort)(centroidIndex << (bitShift * 8));  // Shift by 8 bits for each index
+                    pixelArray[packIndex] |= (ushort)(centroidIndex << (bitShift * 8));
                     bitShift++;
 
-                // Every 2 indices, move to the next position in the pixelArray
                     if (bitShift == 2)
                     {
                         bitShift = 0;
@@ -110,20 +112,23 @@ public class ImageQuantizer
                     packIndex++;
                 }
             }
+        }
 
-        // Create the CLUT as a 1D array of RGB values
         int actualColors = centroids.Count;
-        float[] clut = new float[actualColors * 3];
+        ushort[] clut = new ushort[actualColors];
         for (int i = 0; i < actualColors; i++)
         {
-            clut[i * 3 + 0] = centroids[i].x; // Red
+            int red = Mathf.Clamp(Mathf.RoundToInt(centroids[i].x * 31), 0, 31); // 5 bits
-            clut[i * 3 + 1] = centroids[i].y; // Green
+            int green = Mathf.Clamp(Mathf.RoundToInt(centroids[i].y * 31), 0, 31); // 5 bits
-            clut[i * 3 + 2] = centroids[i].z; // Blue
+            int blue = Mathf.Clamp(Mathf.RoundToInt(centroids[i].z * 31), 0, 31); // 5 bits
+
+            clut[i] = (ushort)((blue << 10) | (green << 5) | red);
         }
 
         return (pixelArray, clut);
     }
 
+
     private static List<Vector3> InitializeCentroids(Texture2D image, int maxColors)
     {
         List<Vector3> centroids = new List<Vector3>();