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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.shader.plugins;
import com.jme3.asset.AssetInfo;
import com.jme3.asset.AssetKey;
import com.jme3.asset.AssetLoader;
import com.jme3.asset.AssetManager;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.*;
/**
* GLSL File parser that supports #import pre-processor statement
*/
public class GLSLLoader implements AssetLoader {
private AssetManager owner;
private Map<String, DependencyNode> dependCache = new HashMap<String, DependencyNode>();
private class DependencyNode {
private String shaderSource;
private String shaderName;
private final Set<DependencyNode> dependsOn = new HashSet<DependencyNode>();
private final Set<DependencyNode> dependOnMe = new HashSet<DependencyNode>();
public DependencyNode(String shaderName){
this.shaderName = shaderName;
}
public void setSource(String source){
this.shaderSource = source;
}
public void addDependency(DependencyNode node){
if (this.dependsOn.contains(node))
return; // already contains dependency
// System.out.println(shaderName + " depend on "+node.shaderName);
this.dependsOn.add(node);
node.dependOnMe.add(this);
}
}
private class GlslDependKey extends AssetKey<InputStream> {
public GlslDependKey(String name){
super(name);
}
@Override
public boolean shouldCache(){
return false;
}
}
private DependencyNode loadNode(InputStream in, String nodeName) throws IOException{
DependencyNode node = new DependencyNode(nodeName);
if (in == null)
throw new IOException("Dependency "+nodeName+" cannot be found.");
StringBuilder sb = new StringBuilder();
BufferedReader r = new BufferedReader(new InputStreamReader(in));
while (r.ready()){
String ln = r.readLine();
if (ln.startsWith("#import ")){
ln = ln.substring(8).trim();
if (ln.startsWith("\"") && ln.endsWith("\"") && ln.length() > 3){
// import user code
// remove quotes to get filename
ln = ln.substring(1, ln.length()-1);
if (ln.equals(nodeName))
throw new IOException("Node depends on itself.");
// check cache first
DependencyNode dependNode = dependCache.get(ln);
if (dependNode == null){
GlslDependKey key = new GlslDependKey(ln);
// make sure not to register an input stream with
// the cache..
InputStream stream = (InputStream) owner.loadAsset(key);
dependNode = loadNode(stream, ln);
}
node.addDependency(dependNode);
}
// }else if (ln.startsWith("uniform") || ln.startsWith("varying") || ln.startsWith("attribute")){
// // these variables are included as dependencies as well
// DependencyNode dependNode = dependCache.get(ln);
// if (dependNode == null){
// // the source and name are the same for variable dependencies
// dependNode = new DependencyNode(ln);
// dependNode.setSource(ln);
// dependCache.put(ln, dependNode);
// }
// node.addDependency(dependNode);
}else{
sb.append(ln).append('\n');
}
}
r.close();
node.setSource(sb.toString());
dependCache.put(nodeName, node);
return node;
}
private DependencyNode nextIndependentNode(List<DependencyNode> checkedNodes){
Collection<DependencyNode> allNodes = dependCache.values();
if (allNodes == null || allNodes.isEmpty())
return null;
for (DependencyNode node : allNodes){
if (node.dependsOn.isEmpty()){
return node;
}
}
// circular dependency found..
for (DependencyNode node : allNodes){
System.out.println(node.shaderName);
}
throw new RuntimeException("Circular dependency.");
}
private String resolveDependencies(DependencyNode root){
StringBuilder sb = new StringBuilder();
List<DependencyNode> checkedNodes = new ArrayList<DependencyNode>();
checkedNodes.add(root);
while (true){
DependencyNode indepnNode = nextIndependentNode(checkedNodes);
if (indepnNode == null)
break;
sb.append(indepnNode.shaderSource).append('\n');
dependCache.remove(indepnNode.shaderName);
// take out this dependency
for (Iterator<DependencyNode> iter = indepnNode.dependOnMe.iterator();
iter.hasNext();){
DependencyNode dependNode = iter.next();
iter.remove();
dependNode.dependsOn.remove(indepnNode);
}
}
// System.out.println(sb.toString());
// System.out.println("--------------------------------------------------");
return sb.toString();
}
/**
*
* @param owner
* @param in
* @param extension
* @param key
* @return
* @throws java.io.IOException
*/
public Object load(AssetInfo info) throws IOException {
// The input stream provided is for the vertex shader,
// to retrieve the fragment shader, use the content manager
this.owner = info.getManager();
if (info.getKey().getExtension().equals("glsllib")){
// NOTE: Loopback, GLSLLIB is loaded by this loader
// and needs data as InputStream
return info.openStream();
}else{
// GLSLLoader wants result as String for
// fragment shader
DependencyNode rootNode = loadNode(info.openStream(), "[main]");
String code = resolveDependencies(rootNode);
dependCache.clear();
return code;
}
}
}
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