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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 com.jme3.scene.plugins.blender;
import com.jme3.math.FastMath;
import com.jme3.math.Quaternion;
import com.jme3.scene.plugins.blender.exceptions.BlenderFileException;
import com.jme3.scene.plugins.blender.file.Pointer;
import com.jme3.scene.plugins.blender.file.Structure;
import com.jme3.scene.plugins.blender.objects.Properties;
import com.jme3.util.BufferUtils;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.util.List;
/**
* A purpose of the helper class is to split calculation code into several classes. Each helper after use should be cleared because it can
* hold the state of the calculations.
* @author Marcin Roguski
*/
public abstract class AbstractBlenderHelper {
/** The version of the blend file. */
protected final int blenderVersion;
/** This variable indicates if the Y asxis is the UP axis or not. */
protected boolean fixUpAxis;
/** Quaternion used to rotate data when Y is up axis. */
protected Quaternion upAxisRotationQuaternion;
/**
* This constructor parses the given blender version and stores the result. Some functionalities may differ in different blender
* versions.
* @param blenderVersion
* the version read from the blend file
* @param fixUpAxis
* a variable that indicates if the Y asxis is the UP axis or not
*/
public AbstractBlenderHelper(String blenderVersion, boolean fixUpAxis) {
this.blenderVersion = Integer.parseInt(blenderVersion);
this.fixUpAxis = fixUpAxis;
if(fixUpAxis) {
upAxisRotationQuaternion = new Quaternion().fromAngles(-FastMath.HALF_PI, 0, 0);
}
}
/**
* This method clears the state of the helper so that it can be used for different calculations of another feature.
*/
public void clearState() {}
/**
* This method should be used to check if the text is blank. Avoid using text.trim().length()==0. This causes that more strings are
* being created and stored in the memory. It can be unwise especially inside loops.
* @param text
* the text to be checked
* @return <b>true</b> if the text is blank and <b>false</b> otherwise
*/
protected boolean isBlank(String text) {
if (text != null) {
for (int i = 0; i < text.length(); ++i) {
if (!Character.isWhitespace(text.charAt(i))) {
return false;
}
}
}
return true;
}
/**
* Generate a new ByteBuffer using the given array of byte[4] objects. The ByteBuffer will be 4 * data.length
* long and contain the vector data as data[0][0], data[0][1], data[0][2], data[0][3], data[1][0]... etc.
* @param data
* list of byte[4] objects to place into a new ByteBuffer
*/
protected ByteBuffer createByteBuffer(List<byte[]> data) {
if (data == null) {
return null;
}
ByteBuffer buff = BufferUtils.createByteBuffer(4 * data.size());
for (byte[] v : data) {
if (v != null) {
buff.put(v[0]).put(v[1]).put(v[2]).put(v[3]);
} else {
buff.put((byte)0).put((byte)0).put((byte)0).put((byte)0);
}
}
buff.flip();
return buff;
}
/**
* Generate a new FloatBuffer using the given array of float[4] objects. The FloatBuffer will be 4 * data.length
* long and contain the vector data as data[0][0], data[0][1], data[0][2], data[0][3], data[1][0]... etc.
* @param data
* list of float[4] objects to place into a new FloatBuffer
*/
protected FloatBuffer createFloatBuffer(List<float[]> data) {
if (data == null) {
return null;
}
FloatBuffer buff = BufferUtils.createFloatBuffer(4 * data.size());
for (float[] v : data) {
if (v != null) {
buff.put(v[0]).put(v[1]).put(v[2]).put(v[3]);
} else {
buff.put(0).put(0).put(0).put(0);
}
}
buff.flip();
return buff;
}
/**
* This method loads the properties if they are available and defined for the structure.
* @param structure
* the structure we read the properties from
* @param blenderContext
* the blender context
* @return loaded properties or null if they are not available
* @throws BlenderFileException
* an exception is thrown when the blend file is somehow corrupted
*/
protected Properties loadProperties(Structure structure, BlenderContext blenderContext) throws BlenderFileException {
Properties properties = null;
Structure id = (Structure) structure.getFieldValue("ID");
if (id != null) {
Pointer pProperties = (Pointer) id.getFieldValue("properties");
if (pProperties.isNotNull()) {
Structure propertiesStructure = pProperties.fetchData(blenderContext.getInputStream()).get(0);
properties = new Properties();
properties.load(propertiesStructure, blenderContext);
}
}
return properties;
}
/**
* This method analyzes the given structure and the data contained within
* blender context and decides if the feature should be loaded.
* @param structure
* structure to be analyzed
* @param blenderContext
* the blender context
* @return <b>true</b> if the feature should be loaded and false otherwise
*/
public abstract boolean shouldBeLoaded(Structure structure, BlenderContext blenderContext);
}
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