Sculpt meshing refactoring - improves mesh accuracy and UV mapping

Sync with PrimMesher r55

OpenSim/Region/Physics/Meshing/SculptMap.cs

@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) Contributors
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// to build without references to System.Drawing, comment this out
+#define SYSTEM_DRAWING
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+#if SYSTEM_DRAWING
+using System.Drawing;
+using System.Drawing.Imaging;
+
+namespace PrimMesher
+{
+    public class SculptMap
+    {
+        public int width;
+        public int height;
+        public byte[] redBytes;
+        public byte[] greenBytes;
+        public byte[] blueBytes;
+
+        public SculptMap()
+        {
+        }
+
+        public SculptMap(Bitmap bm, int lod)
+        {
+            int bmW = bm.Width;
+            int bmH = bm.Height;
+
+            if (bmW == 0 || bmH == 0)
+                throw new Exception("SculptMap: bitmap has no data");
+
+            int numLodPixels = lod * 2 * lod * 2;  // (32 * 2)^2  = 64^2 pixels for default sculpt map image
+
+            width = bmW;
+            height = bmH;
+            while (width * height > numLodPixels)
+            {
+                width >>= 1;
+                height >>= 1;
+            }
+
+            width >>= 1;
+            height >>= 1;
+
+            try
+            {
+                if (!(bmW == width * 2 && bmH == height * 2))
+                    bm = ScaleImage(bm, width * 2, height * 2,
+                        System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor);
+            }
+
+            catch (Exception e)
+            {
+                throw new Exception("Exception in ScaleImage(): e: " + e.ToString());
+            }
+
+
+            int numBytes = (width + 1) * (height + 1);
+            redBytes = new byte[numBytes];
+            greenBytes = new byte[numBytes];
+            blueBytes = new byte[numBytes];
+
+            int byteNdx = 0;
+
+            try
+            {
+                for (int y = 0; y <= height; y++)
+                {
+                    for (int x = 0; x <= width; x++)
+                    {
+                        int bmY = y < height ? y * 2 : y * 2 - 1;
+                        int bmX = x < width ? x * 2 : x * 2 - 1;
+                        Color c = bm.GetPixel(bmX, bmY);
+
+                        redBytes[byteNdx] = c.R;
+                        greenBytes[byteNdx] = c.G;
+                        blueBytes[byteNdx] = c.B;
+
+                        ++byteNdx;
+                    }
+                }
+            }
+            catch (Exception e)
+            {
+                throw new Exception("Caught exception processing byte arrays in SculptMap(): e: " + e.ToString());
+            }
+
+            width++;
+            height++;
+        }
+
+        public List<List<Coord>> ToRows(bool mirror)
+        {
+            int numRows = height;
+            int numCols = width;
+
+            List<List<Coord>> rows = new List<List<Coord>>(numRows);
+
+            float pixScale = 1.0f / 255;
+
+            int rowNdx, colNdx;
+            int smNdx = 0;
+
+            for (rowNdx = 0; rowNdx < numRows; rowNdx++)
+            {
+                List<Coord> row = new List<Coord>(numCols);
+                for (colNdx = 0; colNdx < numCols; colNdx++)
+                {
+                    if (mirror)
+                        row.Add(new Coord(-(redBytes[smNdx] * pixScale - 0.5f), (greenBytes[smNdx] * pixScale - 0.5f), blueBytes[smNdx] * pixScale - 0.5f));
+                    else
+                        row.Add(new Coord(redBytes[smNdx] * pixScale - 0.5f, greenBytes[smNdx] * pixScale - 0.5f, blueBytes[smNdx] * pixScale - 0.5f));
+
+                    ++smNdx;
+                }
+                rows.Add(row);
+            }
+            return rows;
+        }
+
+        private Bitmap ScaleImage(Bitmap srcImage, int destWidth, int destHeight,
+                System.Drawing.Drawing2D.InterpolationMode interpMode)
+        {
+            Bitmap scaledImage = new Bitmap(srcImage, destWidth, destHeight);
+            scaledImage.SetResolution(96.0f, 96.0f);
+
+            Graphics grPhoto = Graphics.FromImage(scaledImage);
+            grPhoto.InterpolationMode = interpMode;
+
+            grPhoto.DrawImage(srcImage,
+                new Rectangle(0, 0, destWidth, destHeight),
+                new Rectangle(0, 0, srcImage.Width, srcImage.Height),
+                GraphicsUnit.Pixel);
+
+            grPhoto.Dispose();
+            return scaledImage;
+        }
+    }
+}
+#endif