/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution 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 Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.opengl.impl;
import javax.media.opengl.*;
import java.util.*;
// FIXME: refactor Java SE dependencies
//import java.util.regex.*;
import java.lang.reflect.*;
/**
* A utility object intended to be used by implementations to act as a cache
* of which OpenGL extensions are currently available on both the host machine
* and display.
*/
public final class ExtensionAvailabilityCache {
private static final boolean DEBUG = Debug.debug("ExtensionAvailabilityCache");
private static final boolean DEBUG_AVAILABILITY = Debug.isPropertyDefined("ExtensionAvailabilityCache", true);
ExtensionAvailabilityCache(GLContextImpl context)
{
this.context = context;
}
/**
* Flush the cache. The cache will be rebuilt lazily as calls to {@link
* #isExtensionAvailable(String)} are received.
*/
public void flush()
{
availableExtensionCache.clear();
}
public boolean isExtensionAvailable(String glExtensionName) {
initAvailableExtensions();
return availableExtensionCache.contains(mapGLExtensionName(glExtensionName));
}
protected void initAvailableExtensions() {
// if hash is empty (meaning it was flushed), pre-cache it with the list
// of extensions that are in the GL_EXTENSIONS string
if (availableExtensionCache.isEmpty()) {
GL gl = context.getGL();
if (DEBUG) {
System.err.println("!!! Pre-caching extension availability");
}
String allAvailableExtensions =
gl.glGetString(GL.GL_EXTENSIONS) + " " + context.getPlatformExtensionsString();
if (DEBUG) {
System.err.println("!!! Available extensions: " + allAvailableExtensions);
System.err.println("!!! GL vendor: " + gl.glGetString(GL.GL_VENDOR));
}
StringTokenizer tok = new StringTokenizer(allAvailableExtensions);
while (tok.hasMoreTokens()) {
String availableExt = tok.nextToken().trim();
availableExt = availableExt.intern();
availableExtensionCache.add(availableExt);
if (DEBUG_AVAILABILITY) {
System.err.println("!!! Available: " + availableExt);
}
}
// Put GL version strings in the table as well
Version version = new Version(gl.glGetString(GL.GL_VERSION));
if (version.isValid()) {
int major = version.getMajor();
int minor = version.getMinor();
// FIXME: this needs to be adjusted when the major rev changes
// beyond the known ones
while (major > 0) {
while (minor >= 0) {
availableExtensionCache.add("GL_VERSION_" + major + "_" + minor);
if (DEBUG) {
System.err.println("!!! Added GL_VERSION_" + major + "_" + minor + " to known extensions");
}
--minor;
}
switch (major) {
case 2:
// Restart loop at version 1.5
minor = 5;
break;
case 1:
break;
}
--major;
}
}
// put a dummy var in here so that the cache is no longer empty even if
// no extensions are in the GL_EXTENSIONS string
availableExtensionCache.add("<INTERNAL_DUMMY_PLACEHOLDER>");
}
}
// FIXME: hack to re-enable GL_NV_vertex_array_range extension after
// recent upgrade to new wglext.h and glxext.h headers
private static String mapGLExtensionName(String extensionName) {
if (extensionName != null &&
(extensionName.equals("WGL_NV_vertex_array_range") ||
extensionName.equals("GLX_NV_vertex_array_range")))
return "GL_NV_vertex_array_range";
return extensionName;
}
//----------------------------------------------------------------------
// Internals only below this point
//
private HashSet availableExtensionCache = new HashSet(50);
private GLContextImpl context;
/**
* A class for storing and comparing OpenGL version numbers.
* This only works for desktop OpenGL at the moment.
*/
private static class Version implements Comparable
{
private boolean valid;
private int major, minor, sub;
public Version(int majorRev, int minorRev, int subMinorRev)
{
major = majorRev;
minor = minorRev;
sub = subMinorRev;
}
/**
* @param versionString must be of the form "GL_VERSION_X" or
* "GL_VERSION_X_Y" or "GL_VERSION_X_Y_Z" or "X.Y", where X, Y,
* and Z are integers.
*
* @exception IllegalArgumentException if the argument is not a valid
* OpenGL version identifier
*/
public Version(String versionString)
{
try
{
if (versionString.startsWith("GL_VERSION_"))
{
StringTokenizer tok = new StringTokenizer(versionString, "_");
tok.nextToken(); // GL_
tok.nextToken(); // VERSION_
if (!tok.hasMoreTokens()) { major = 0; return; }
major = Integer.valueOf(tok.nextToken()).intValue();
if (!tok.hasMoreTokens()) { minor = 0; return; }
minor = Integer.valueOf(tok.nextToken()).intValue();
if (!tok.hasMoreTokens()) { sub = 0; return; }
sub = Integer.valueOf(tok.nextToken()).intValue();
}
else
{
int radix = 10;
if (versionString.length() > 2) {
if (Character.isDigit(versionString.charAt(0)) &&
versionString.charAt(1) == '.' &&
Character.isDigit(versionString.charAt(2))) {
major = Character.digit(versionString.charAt(0), radix);
minor = Character.digit(versionString.charAt(2), radix);
// See if there's version-specific information which might
// imply a more recent OpenGL version
StringTokenizer tok = new StringTokenizer(versionString, " ");
if (tok.hasMoreTokens()) {
tok.nextToken();
if (tok.hasMoreTokens()) {
String token = tok.nextToken();
int i = 0;
while (i < token.length() && !Character.isDigit(token.charAt(i))) {
i++;
}
if (i < token.length() - 2 &&
Character.isDigit(token.charAt(i)) &&
token.charAt(i+1) == '.' &&
Character.isDigit(token.charAt(i+2))) {
int altMajor = Character.digit(token.charAt(i), radix);
int altMinor = Character.digit(token.charAt(i+2), radix);
// Avoid possibly confusing situations by putting some
// constraints on the upgrades we do to the major and
// minor versions
if ((altMajor == major && altMinor > minor) ||
altMajor == major + 1) {
major = altMajor;
minor = altMinor;
}
}
}
}
}
}
}
valid = true;
}
catch (Exception e)
{
// FIXME: refactor desktop OpenGL dependencies and make this
// class work properly for OpenGL ES
System.err.println("FunctionAvailabilityCache.Version.<init>: "+e);
major = 1;
minor = 0;
/*
throw (IllegalArgumentException)
new IllegalArgumentException(
"Illegally formatted version identifier: \"" + versionString + "\"")
.initCause(e);
*/
}
}
public boolean isValid() {
return valid;
}
public int compareTo(Object o)
{
Version vo = (Version)o;
if (major > vo.major) return 1;
else if (major < vo.major) return -1;
else if (minor > vo.minor) return 1;
else if (minor < vo.minor) return -1;
else if (sub > vo.sub) return 1;
else if (sub < vo.sub) return -1;
return 0; // they are equal
}
public int getMajor() {
return major;
}
public int getMinor() {
return minor;
}
} // end class Version
}