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jMonkeyEngine is a 3-D game engine for adventurous Java developers
/*
* Copyright (c) 2009-2021 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
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* 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 com.jme3.math.ColorRGBA;
import com.jme3.texture.Image;
import com.jme3.texture.image.ImageRaster;
/**
* ImageBasedHeightMap 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 {
protected Image colorImage;
private float backwardsCompScale = 255f;
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 the highest point, and black is the 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
*/
@Override
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);
}
protected float calculateHeight(ColorRGBA color) {
return (float) (0.299 * color.r + 0.587 * color.g + 0.114 * color.b);
}
protected ImageRaster getImageRaster() {
return ImageRaster.create(colorImage);
}
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;
ImageRaster raster = getImageRaster();
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++] = getHeightAtPosition(raster, baseIndex, colorStore)*heightScale;
heightData[index++] = calculateHeight(raster.getPixel(w, h, colorStore))*heightScale*backwardsCompScale;
}
} else {
for (int w = 0; w < imageWidth; ++w) {
//int baseIndex = (h * imageWidth)+ w;
//heightData[index++] = getHeightAtPosition(raster, baseIndex, colorStore)*heightScale;
heightData[index++] = calculateHeight(raster.getPixel(w, h, colorStore))*heightScale*backwardsCompScale;
}
}
}
} 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++] = getHeightAtPosition(raster, baseIndex, colorStore)*heightScale;
heightData[index++] = calculateHeight(raster.getPixel(w, h, colorStore))*heightScale*backwardsCompScale;
}
} else {
for (int w = 0; w < imageWidth; ++w) {
//int baseIndex = (h * imageWidth)+ w;
//heightData[index++] = getHeightAtPosition(raster, baseIndex, colorStore)*heightScale;
heightData[index++] = calculateHeight(raster.getPixel(w, h, colorStore))*heightScale*backwardsCompScale;
}
}
}
}
return true;
}
/*protected float getHeightAtPosition(ImageRaster 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;
}*/
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