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/*
* Copyright (c) 2009-2016 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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*/
package com.jme3.opencl;
import com.jme3.system.JmeSystem;
import com.jme3.util.BufferUtils;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.file.Files;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Implements a simple cache system for program objects.
* The program objects are saved persistently with {@link #saveToCache(java.lang.String, com.jme3.opencl.Program) }.
* On the next run, the stored programs can then be loaded
* with {@link #loadFromCache(java.lang.String, java.lang.String) }.
*
* The programs are identified by a unique id. The following format is recommended:
* {@code id = .}.
*
* @author shaman
*/
public class ProgramCache {
private static final Logger LOG = Logger.getLogger(ProgramCache.class.getName());
private static final String FILE_EXTENSION = ".clbin";
private final Context context;
private final Device device;
private final File tmpFolder;
/**
* Creates a "disabled" program cache, no caching is done.
* {@link #loadFromCache(java.lang.String) } will always return {@code null}
* and {@link #saveToCache(java.lang.String, com.jme3.opencl.Program) } does
* nothing.
* Use this during development if you still modify your kernel code.
* (Otherwise, you don't see the changes because you are still use the
* cached version of your program)
*/
public ProgramCache() {
this.context = null;
this.device = null;
this.tmpFolder = null;
}
/**
* Creates a new program cache associated with the specified context and
* devices.
* The cached programs are built against the specified device and also
* only the binaries linked to that device are stored.
* @param context the OpenCL context
* @param device the OpenCL device
*/
public ProgramCache(Context context, Device device) {
this.context = context;
this.device = device;
if (JmeSystem.isLowPermissions()) {
tmpFolder = null;
} else {
tmpFolder = JmeSystem.getStorageFolder();
}
}
protected String getCleanFileName(String id) {
//http://stackoverflow.com/a/35591188/4053176
return id.replaceAll("[^a-zA-Z0-9.-]", "") + FILE_EXTENSION;
}
/**
* Creates a new program cache using the first device from the specified
* context.
* @param context the context
* @see #ProgramCache(com.jme3.opencl.Context, com.jme3.opencl.Device)
*/
public ProgramCache(Context context) {
this(context, context.getDevices().get(0));
}
/**
* Loads the program from the cache and builds it against the current device.
* You can pass additional build arguments with the parameter {@code buildArgs}.
*
* The cached program is identified by the specified id.
* This id must be unique, otherwise collisions within the cache occur.
* Therefore, the following naming schema is recommended:
* {@code id = .}.
*
* If the program can't be loaded, built or any other exception happened,
* {@code null} is returned.
*
* @param id the unique identifier of this program
* @param buildArgs additional build arguments, can be {@code null}
* @return the loaded and built program, or {@code null}
* @see #saveToCache(java.lang.String, com.jme3.opencl.Program)
*/
public Program loadFromCache(String id, String buildArgs) {
if (tmpFolder == null) {
return null; //low permissions
}
//get file
File file = new File(tmpFolder, getCleanFileName(id));
if (!file.exists()) {
if (LOG.isLoggable(Level.FINE)) {
LOG.log(Level.FINE, "Cache file {0} does not exist", file.getAbsolutePath());
}
return null;
}
//load from file
ByteBuffer bb;
try {
byte[] bytes = Files.readAllBytes(file.toPath());
bb = BufferUtils.createByteBuffer(bytes);
} catch (IOException ex) {
LOG.log(Level.FINE, "Unable to read cache file", ex);
return null;
}
//create program
Program program;
try {
program = context.createProgramFromBinary(bb, device);
} catch (OpenCLException ex) {
LOG.log(Level.FINE, "Unable to create program from binary", ex);
return null;
}
//build program
try {
program.build(buildArgs, device);
} catch (OpenCLException ex) {
LOG.log(Level.FINE, "Unable to build program", ex);
return null;
}
//done
return program;
}
/**
* Calls {@link #loadFromCache(java.lang.String, java.lang.String) }
* with the additional build arguments set to {@code ""}.
* @param id a unique identifier of the program
* @return the loaded and built program or {@code null} if this
* program could not be loaded from the cache
* @see #loadFromCache(java.lang.String, java.lang.String)
*/
public Program loadFromCache(String id) {
return loadFromCache(id, "");
}
/**
* Saves the specified program in the cache.
* The parameter {@code id} denotes the name of the program. Under this id,
* the program is then loaded again by {@link #loadFromCache(java.lang.String, java.lang.String) }.
*
* The id must be unique, otherwise collisions within the cache occur.
* Therefore, the following naming schema is recommended:
* {@code id = .}.
*
* @param id the program id
* @param program the program to store in the cache
*/
public void saveToCache(String id, Program program) {
if (tmpFolder == null) {
return; //low permissions
}
//get file
File file = new File(tmpFolder, getCleanFileName(id));
//get binaries
ByteBuffer bb;
try {
bb = program.getBinary(device);
} catch (UnsupportedOperationException | OpenCLException ex) {
LOG.log(Level.WARNING, "Unable to retrieve the program binaries", ex);
return;
}
byte[] bytes = new byte[bb.remaining()];
bb.get(bytes);
//save
try {
Files.write(file.toPath(), bytes);
} catch (IOException ex) {
LOG.log(Level.WARNING, "Unable to save program binaries to the cache", ex);
}
}
/**
* Clears the cache.
* All saved program binaries are deleted.
*/
public void clearCache() {
if (tmpFolder == null) {
return; //low permissions
}
for (File file : tmpFolder.listFiles()) {
if (file.isFile() && file.getName().endsWith(FILE_EXTENSION)) {
file.delete();
}
}
}
}