/* * 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(""); } } // 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.: "+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 }