/* * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved. * Copyright (c) 2010 JogAmp Community. 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 jogamp.opengl; import javax.media.opengl.*; import java.util.*; /** * 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. */ final class ExtensionAvailabilityCache { protected static final boolean DEBUG = GLContextImpl.DEBUG; ExtensionAvailabilityCache() { flush(); } /** * Flush the cache. */ final void flush() { initialized = false; glExtensions = null; glExtensionCount = 0; glXExtensions = null; glXExtensionCount = 0; availableExtensionCache.clear(); } /** * Flush and rebuild the cache. */ final void reset(GLContextImpl context) { flush(); initAvailableExtensions(context); } final boolean isInitialized() { return initialized && !availableExtensionCache.isEmpty() ; } final int getTotalExtensionCount() { validateInitialization(); return availableExtensionCache.size(); } final boolean isExtensionAvailable(String glExtensionName) { validateInitialization(); return availableExtensionCache.contains(glExtensionName); } final int getPlatformExtensionCount() { validateInitialization(); return glXExtensionCount; } final String getPlatformExtensionsString() { validateInitialization(); return glXExtensions; } final int getGLExtensionCount() { validateInitialization(); return glExtensionCount; } final String getGLExtensionsString() { validateInitialization(); if(DEBUG) { System.err.println("ExtensionAvailabilityCache: getGLExtensions() called"); } return glExtensions; } private final void validateInitialization() { if (!isInitialized()) { throw new InternalError("ExtensionAvailabilityCache not initialized!"); } } private final void initAvailableExtensions(GLContextImpl context) { GL gl = context.getGL(); // if hash is empty (meaning it was flushed), pre-cache it with the list // of extensions that are in the GL_EXTENSIONS string if (isInitialized()) { throw new InternalError("ExtensionAvailabilityCache already initialized!"); } if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Pre-caching init "+gl+", OpenGL "+context.getGLVersion()); } boolean useGetStringi = false; // Use 'glGetStringi' only for ARB GL3 context, // on GL2 platforms the function might be available, but not working. if ( context.isGL3() ) { if ( ! context.isFunctionAvailable("glGetStringi") ) { if(DEBUG) { System.err.println("GLContext: GL >= 3.1 usage, but no glGetStringi"); } } else { useGetStringi = true; } } if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Pre-caching extension availability OpenGL "+context.getGLVersion()+ ", use "+ ( useGetStringi ? "glGetStringi" : "glGetString" ) ); } HashSet<String> glExtensionSet = new HashSet<String>(gl.isGLES() ? 50 : 320); // far less gl extension expected on mobile if(useGetStringi) { GL2GL3 gl2gl3 = gl.getGL2GL3(); final int count; { int[] val = { 0 } ; gl2gl3.glGetIntegerv(GL2GL3.GL_NUM_EXTENSIONS, val, 0); count = val[0]; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < count; i++) { if(i > 0) { sb.append(" "); } final String ext = gl2gl3.glGetStringi(GL.GL_EXTENSIONS, i); glExtensionSet.add(ext); sb.append(ext); } if(0==count || sb.length()==0) { // fall back .. useGetStringi=false; } else { glExtensions = sb.toString(); } } if(!useGetStringi) { glExtensions = gl.glGetString(GL.GL_EXTENSIONS); if(null != glExtensions) { StringTokenizer tok = new StringTokenizer(glExtensions); while (tok.hasMoreTokens()) { glExtensionSet.add(tok.nextToken().trim()); } } } glExtensionCount = glExtensionSet.size(); if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: GL_EXTENSIONS: "+glExtensionCount+ ", used "+ ( useGetStringi ? "glGetStringi" : "glGetString" ) ); } // Platform Extensions HashSet<String> glXExtensionSet = new HashSet<String>(50); { // unify platform extension .. might have duplicates StringTokenizer tok = new StringTokenizer(context.getPlatformExtensionsStringImpl().toString()); while (tok.hasMoreTokens()) { glXExtensionSet.add(tok.nextToken().trim()); } final StringBuilder sb = new StringBuilder(); for(Iterator<String> iter = glXExtensionSet.iterator(); iter.hasNext(); ) { sb.append(iter.next()); if(iter.hasNext()) { sb.append(" "); } } glXExtensions = sb.toString(); glXExtensionCount = glXExtensionSet.size(); } availableExtensionCache.addAll(glExtensionSet); availableExtensionCache.addAll(glXExtensionSet); if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: GLX_EXTENSIONS: "+glXExtensionCount); System.err.println(getThreadName() + ":ExtensionAvailabilityCache: GL vendor: " + gl.glGetString(GL.GL_VENDOR)); System.err.println(getThreadName() + ":ExtensionAvailabilityCache: ALL EXTENSIONS: "+availableExtensionCache.size()); } if(!context.isGLES()) { int major[] = new int[] { context.getGLVersionMajor() }; int minor[] = new int[] { context.getGLVersionMinor() }; while (GLContext.isValidGLVersion(major[0], minor[0])) { availableExtensionCache.add("GL_VERSION_" + major[0] + "_" + minor[0]); if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Added GL_VERSION_" + major[0] + "_" + minor[0] + " to known extensions"); } if(!GLContext.decrementGLVersion(major, minor)) break; } } // 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>"); initialized = true; } //---------------------------------------------------------------------- // Internals only below this point // private boolean initialized = false; private String glExtensions = null; private int glExtensionCount = 0; private String glXExtensions = null; private int glXExtensionCount = 0; private HashSet<String> availableExtensionCache = new HashSet<String>(50); static String getThreadName() { return Thread.currentThread().getName(); } }