/* | |
* 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 | |
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* 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 com.jme3.terrain.heightmap; | |
import java.nio.ByteBuffer; | |
import com.jme3.math.ColorRGBA; | |
import com.jme3.texture.Image; | |
import java.nio.ShortBuffer; | |
/** | |
* <code>ImageBasedHeightMap</code> is a height map created from the grayscale | |
* conversion of an image. The image used currently must have an equal height | |
* and width, although future work could scale an incoming image to a specific | |
* height and width. | |
* | |
* @author Mike Kienenberger | |
* @version $id$ | |
*/ | |
public class ImageBasedHeightMap extends AbstractHeightMap implements ImageHeightmap { | |
protected Image colorImage; | |
public void setImage(Image image) { | |
this.colorImage = image; | |
} | |
/** | |
* Creates a HeightMap from an Image. The image will be converted to | |
* grayscale, and the grayscale values will be used to generate the height | |
* map. White is highest point while black is lowest point. | |
* | |
* Currently, the Image used must be square (width == height), but future | |
* work could rescale the image. | |
* | |
* @param colorImage | |
* Image to map to the height map. | |
*/ | |
public ImageBasedHeightMap(Image colorImage) { | |
this.colorImage = colorImage; | |
} | |
public ImageBasedHeightMap(Image colorImage, float heightScale) { | |
this.colorImage = colorImage; | |
this.heightScale = heightScale; | |
} | |
/** | |
* Loads the image data from top left to bottom right | |
*/ | |
public boolean load() { | |
return load(false, false); | |
} | |
/** | |
* Get the grayscale value, or override in your own sub-classes | |
*/ | |
protected float calculateHeight(float red, float green, float blue) { | |
return (float) (0.299 * red + 0.587 * green + 0.114 * blue); | |
} | |
public boolean load(boolean flipX, boolean flipY) { | |
int imageWidth = colorImage.getWidth(); | |
int imageHeight = colorImage.getHeight(); | |
if (imageWidth != imageHeight) | |
throw new RuntimeException("imageWidth: " + imageWidth | |
+ " != imageHeight: " + imageHeight); | |
size = imageWidth; | |
ByteBuffer buf = colorImage.getData(0); | |
heightData = new float[(imageWidth * imageHeight)]; | |
ColorRGBA colorStore = new ColorRGBA(); | |
int index = 0; | |
if (flipY) { | |
for (int h = 0; h < imageHeight; ++h) { | |
if (flipX) { | |
for (int w = imageWidth - 1; w >= 0; --w) { | |
int baseIndex = (h * imageWidth)+ w; | |
heightData[index++] = getHeightAtPostion(buf, colorImage, baseIndex, colorStore)*heightScale; | |
} | |
} else { | |
for (int w = 0; w < imageWidth; ++w) { | |
int baseIndex = (h * imageWidth)+ w; | |
heightData[index++] = getHeightAtPostion(buf, colorImage, baseIndex, colorStore)*heightScale; | |
} | |
} | |
} | |
} else { | |
for (int h = imageHeight - 1; h >= 0; --h) { | |
if (flipX) { | |
for (int w = imageWidth - 1; w >= 0; --w) { | |
int baseIndex = (h * imageWidth)+ w; | |
heightData[index++] = getHeightAtPostion(buf, colorImage, baseIndex, colorStore)*heightScale; | |
} | |
} else { | |
for (int w = 0; w < imageWidth; ++w) { | |
int baseIndex = (h * imageWidth)+ w; | |
heightData[index++] = getHeightAtPostion(buf, colorImage, baseIndex, colorStore)*heightScale; | |
} | |
} | |
} | |
} | |
return true; | |
} | |
protected float getHeightAtPostion(ByteBuffer buf, Image image, int position, ColorRGBA store) { | |
switch (image.getFormat()){ | |
case RGBA8: | |
buf.position( position * 4 ); | |
store.set(byte2float(buf.get()), byte2float(buf.get()), byte2float(buf.get()), byte2float(buf.get())); | |
return calculateHeight(store.r, store.g, store.b); | |
case ABGR8: | |
buf.position( position * 4 ); | |
float a = byte2float(buf.get()); | |
float b = byte2float(buf.get()); | |
float g = byte2float(buf.get()); | |
float r = byte2float(buf.get()); | |
store.set(r,g,b,a); | |
return calculateHeight(store.r, store.g, store.b); | |
case RGB8: | |
buf.position( position * 3 ); | |
store.set(byte2float(buf.get()), byte2float(buf.get()), byte2float(buf.get()), 1); | |
return calculateHeight(store.r, store.g, store.b); | |
case Luminance8: | |
buf.position( position ); | |
return byte2float(buf.get())*255*heightScale; | |
case Luminance16: | |
ShortBuffer sbuf = buf.asShortBuffer(); | |
sbuf.position( position ); | |
return (sbuf.get() & 0xFFFF) / 65535f * 255f * heightScale; | |
default: | |
throw new UnsupportedOperationException("Image format: "+image.getFormat()); | |
} | |
} | |
private float byte2float(byte b){ | |
return ((float)(b & 0xFF)) / 255f; | |
} | |
} |