1 files changed, 127 insertions, 0 deletions
diff --git a/engine/src/desktop/jme3tools/converters/MipMapGenerator.java b/engine/src/desktop/jme3tools/converters/MipMapGenerator.java
new file mode 100644
index 0000000..a4541e6
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+++ b/engine/src/desktop/jme3tools/converters/MipMapGenerator.java
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+/*
+ * Copyright (c) 2009-2010 jMonkeyEngine
+ * All rights reserved.
+ *
+ * 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 'jMonkeyEngine' 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT OWNER OR
+ * 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.
+ */
+
+package jme3tools.converters;
+
+import com.jme3.math.FastMath;
+import com.jme3.texture.Image;
+import com.jme3.texture.Image.Format;
+import com.jme3.texture.plugins.AWTLoader;
+import com.jme3.util.BufferUtils;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+
+public class MipMapGenerator {
+
+    private static BufferedImage scaleDown(BufferedImage sourceImage, int targetWidth, int targetHeight) {
+        int sourceWidth  = sourceImage.getWidth();
+        int sourceHeight = sourceImage.getHeight();
+
+        BufferedImage targetImage = new BufferedImage(targetWidth, targetHeight, sourceImage.getType());
+
+        Graphics2D g = targetImage.createGraphics();
+        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+        g.drawImage(sourceImage, 0, 0, targetWidth, targetHeight, 0, 0, sourceWidth, sourceHeight, null);
+        g.dispose();
+
+        return targetImage;
+    }
+
+    public static void resizeToPowerOf2(Image image){
+        BufferedImage original = ImageToAwt.convert(image, false, true, 0);
+        int potWidth = FastMath.nearestPowerOfTwo(image.getWidth());
+        int potHeight = FastMath.nearestPowerOfTwo(image.getHeight());
+        int potSize = Math.max(potWidth, potHeight);
+
+        BufferedImage scaled = scaleDown(original, potSize, potSize);
+
+        AWTLoader loader = new AWTLoader();
+        Image output = loader.load(scaled, false);
+
+        image.setWidth(potSize);
+        image.setHeight(potSize);
+        image.setDepth(0);
+        image.setData(output.getData(0));
+        image.setFormat(output.getFormat());
+        image.setMipMapSizes(null);
+    }
+
+    public static void generateMipMaps(Image image){
+        BufferedImage original = ImageToAwt.convert(image, false, true, 0);
+        int width = original.getWidth();
+        int height = original.getHeight();
+        int level = 0;
+
+        BufferedImage current = original;
+        AWTLoader loader = new AWTLoader();
+        ArrayList<ByteBuffer> output = new ArrayList<ByteBuffer>();
+        int totalSize = 0;
+        Format format = null;
+        
+        while (height >= 1 || width >= 1){
+            Image converted = loader.load(current, false);
+            format = converted.getFormat();
+            output.add(converted.getData(0));
+            totalSize += converted.getData(0).capacity();
+
+            if(height == 1 || width == 1) {
+              break;
+            }
+
+            level++;
+
+            height /= 2;
+            width /= 2;
+
+            current = scaleDown(current, width, height);
+        }
+
+        ByteBuffer combinedData = BufferUtils.createByteBuffer(totalSize);
+        int[] mipSizes = new int[output.size()];
+        for (int i = 0; i < output.size(); i++){
+            ByteBuffer data = output.get(i);
+            data.clear();
+            combinedData.put(data);
+            mipSizes[i] = data.capacity();
+        }
+        combinedData.flip();
+
+        // insert mip data into image
+        image.setData(0, combinedData);
+        image.setMipMapSizes(mipSizes);
+        image.setFormat(format);
+    }
+
+}