/* * 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; private static final boolean DEBUG_AVAILABILITY = Debug.isPropertyDefined("jogl.debug.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. */ final void flush() { if(DEBUG) { System.out.println("ExtensionAvailabilityCache: Flush availability OpenGL "+context.getGLVersion()); } availableExtensionCache.clear(); initialized = false; } /** * Flush the cache and rebuild the cache. */ final void reset() { flush(); initAvailableExtensions(); } final boolean isInitialized() { return initialized && !availableExtensionCache.isEmpty() ; } final boolean isExtensionAvailable(String glExtensionName) { initAvailableExtensions(); return availableExtensionCache.contains(mapGLExtensionName(glExtensionName)); } final String getPlatformExtensionsString() { initAvailableExtensions(); return glXExtensions; } final String getGLExtensionsString() { initAvailableExtensions(); if(DEBUG) { System.err.println("ExtensionAvailabilityCache: getGLExtensions() called"); } return glExtensions; } private final void initAvailableExtensions() { 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 (availableExtensionCache.isEmpty() || !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" ) ); } StringBuffer sb = new StringBuffer(); if(useGetStringi) { GL2GL3 gl2gl3 = gl.getGL2GL3(); int[] numExtensions = { 0 } ; gl2gl3.glGetIntegerv(gl2gl3.GL_NUM_EXTENSIONS, numExtensions, 0); for (int i = 0; i < numExtensions[0]; i++) { sb.append(gl2gl3.glGetStringi(gl2gl3.GL_EXTENSIONS, i)); if(i < numExtensions[0]) { sb.append(" "); } } if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: GL_EXTENSIONS: "+numExtensions[0]); } if(0==numExtensions[0]) { // fall back .. useGetStringi=false; } } if(!useGetStringi) { sb.append(gl.glGetString(GL.GL_EXTENSIONS)); } glExtensions = sb.toString(); glXExtensions = context.getPlatformExtensionsString(); sb.append(" "); sb.append(glXExtensions); String allAvailableExtensions = sb.toString(); if (DEBUG_AVAILABILITY) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: 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(getThreadName() + ":ExtensionAvailabilityCache: Available: " + availableExt); } } if (DEBUG) { System.err.println(getThreadName() + ":ExtensionAvailabilityCache: ALL EXTENSIONS: "+availableExtensionCache.size()); } 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; } } // 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 boolean initialized = false; private String glExtensions = null; private String glXExtensions = null; private HashSet availableExtensionCache = new HashSet(50); private GLContextImpl context; static String getThreadName() { return Thread.currentThread().getName(); } }