2004-08-15 19:03:54 -04:00
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/*
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2004-06-12 16:28:34 -04:00
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* Copyright (c) 2002-2004 LWJGL Project
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2004-02-18 12:48:26 -05:00
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* All rights reserved.
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2004-08-15 19:03:54 -04:00
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*
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2004-02-18 12:48:26 -05:00
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* Redistribution and use in source and binary forms, with or without
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2004-08-15 19:03:54 -04:00
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* modification, are permitted provided that the following conditions are
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2004-02-18 12:48:26 -05:00
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* met:
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2004-08-15 19:03:54 -04:00
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*
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* * Redistributions of source code must retain the above copyright
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2004-02-18 12:48:26 -05:00
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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2004-08-15 19:03:54 -04:00
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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2004-02-23 11:30:48 -05:00
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* from this software without specific prior written permission.
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2004-08-15 19:03:54 -04:00
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*
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2004-02-18 12:48:26 -05:00
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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2004-08-15 19:03:54 -04:00
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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2004-02-18 12:48:26 -05:00
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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2004-08-15 19:03:54 -04:00
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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2004-02-18 12:48:26 -05:00
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.opengl;
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2005-05-04 16:59:44 -04:00
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import java.lang.reflect.Method;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.StringTokenizer;
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import java.util.WeakHashMap;
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2005-05-30 12:21:05 -04:00
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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2004-09-09 19:51:16 -04:00
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import org.lwjgl.LWJGLException;
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2005-03-29 13:09:33 -05:00
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import org.lwjgl.LWJGLUtil;
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2004-09-09 19:51:16 -04:00
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import org.lwjgl.Sys;
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2004-02-18 12:48:26 -05:00
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/**
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2004-02-23 11:30:48 -05:00
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* $Id$
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* <p/>
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2004-09-09 19:51:16 -04:00
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* Manages GL contexts. Before any rendering is done by a LWJGL system, a call should be made to GLContext.useContext() with a
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* context. This will ensure that GLContext has an accurate reflection of the current context's capabilities and function
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* pointers.
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2004-02-23 11:30:48 -05:00
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*
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2005-02-17 06:09:40 -05:00
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* This class is thread-safe in the sense that multiple threads can safely call all public methods. The class is also
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2005-02-17 06:57:34 -05:00
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* thread-aware in the sense that it tracks a per-thread current context (including capabilities and function pointers).
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* That way, multiple threads can have multiple contexts current and render to them concurrently.
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2005-02-17 06:09:40 -05:00
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*
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2004-02-23 11:30:48 -05:00
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision$
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2004-02-18 12:48:26 -05:00
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*/
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2004-02-23 11:30:48 -05:00
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public final class GLContext {
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2005-08-07 08:19:09 -04:00
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/**
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* Maps threads to their current context's ContextCapabilities, if any
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*/
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2005-02-16 16:28:57 -05:00
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private final static ThreadLocal current_capabilities = new ThreadLocal();
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2005-08-07 08:19:09 -04:00
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/**
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* The getCapabilities() method is a potential hot spot in any LWJGL application, since
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* it is needed for context capability discovery (e.g. is OpenGL 2.0 supported?), and
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* for the function pointers of gl functions. However, the 'current_capabilities' ThreadLocal
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* is (relatively) expensive to look up, and since most OpenGL applications use are single threaded
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* rendering, the following two is an optimization for this case.
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*
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* ThreadLocals can be thought of as a mapping between threads and values, so the idea
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* is to use a lock-less cache of mappings between threads and the current ContextCapabilities. The cache
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* could be any size, but in our case, we want a single sized cache for optimal performance
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* in the single threaded case.
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*
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* 'fast_path_cache' is the most recent ContextCapabilities (potentially null) and its owner. By
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* recent I mean the last thread setting the value in setCapabilities(). When getCapabilities()
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* is called, a check to see if the current is the owner of the ContextCapabilities instance inf
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* fast_path_cache. If so, the instance is returned, if not, some thread has since taken ownership
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* of the cache entry and the slower current_capabilities ThreadLocal is queried instead.
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*
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* No locks are needed in get/setCapabilities, because even though fast_path_cache can be accessed
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* from multiple threads at once, we are guaranteed by the JVM spec that its value is always valid.
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* Furthermore, if the ownership test in getCapabilities() succeeds, the cache entry can only contain
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* the correct ContextCapabilites (that is, the one from getThreadLocalCapabilites()),
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* since no other thread can sets the owner to anyone else than itself.
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*/
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private static CapabilitiesCacheEntry fast_path_cache = new CapabilitiesCacheEntry();
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/**
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* Simple lock-free cache of CapabilitesEntryCache to avoid allocating more than one
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* cache entry per thread
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*/
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private final static ThreadLocal thread_cache_entries = new ThreadLocal();
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/**
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* The weak mapping from context Object instances to ContextCapabilities. Used
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* to avoid recreating a ContextCapabilities every time a context is made current.
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*/
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2005-02-17 06:09:40 -05:00
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private final static Map capability_cache = new WeakHashMap();
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2004-02-23 11:30:48 -05:00
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2005-08-07 08:19:09 -04:00
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/** Reference count of the native opengl implementation library */
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2004-09-09 19:51:16 -04:00
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private static int gl_ref_count;
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private static boolean did_auto_load;
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2004-07-03 17:12:33 -04:00
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2004-02-23 11:30:48 -05:00
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static {
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2004-03-27 08:48:58 -05:00
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Sys.initialize();
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2004-02-23 11:30:48 -05:00
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}
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2004-02-18 12:48:26 -05:00
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/**
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2005-02-16 07:58:40 -05:00
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* Get the current capabilities instance. It contains the flags used
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* to test for support of a particular extension.
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2004-02-23 11:30:48 -05:00
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*
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2005-02-16 07:58:40 -05:00
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* @return The current capabilities instance.
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2004-02-18 12:48:26 -05:00
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*/
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2005-02-16 07:58:40 -05:00
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public static ContextCapabilities getCapabilities() {
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2005-08-07 08:19:09 -04:00
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CapabilitiesCacheEntry recent_cache_entry = fast_path_cache;
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// Check owner of cache entry
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if (recent_cache_entry.owner == Thread.currentThread()) {
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/* The owner ship test succeeded, so the cache must contain the current ContextCapabilities instance
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* assert recent_cache_entry.capabilities == getThreadLocalCapabilities();
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*/
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return recent_cache_entry.capabilities;
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} else // Some other thread has written to the cache since, and we fall back to the slower path
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return getThreadLocalCapabilities();
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2004-02-23 11:30:48 -05:00
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}
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2005-02-16 07:58:40 -05:00
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2005-08-07 08:19:09 -04:00
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private static ContextCapabilities getThreadLocalCapabilities() {
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return ((ContextCapabilities)current_capabilities.get());
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}
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2005-02-16 11:04:29 -05:00
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/**
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* Set the current capabilities instance. It contains the flags used
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* to test for support of a particular extension.
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*
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* @return The current capabilities instance.
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*/
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static void setCapabilities(ContextCapabilities capabilities) {
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current_capabilities.set(capabilities);
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2005-08-07 08:19:09 -04:00
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CapabilitiesCacheEntry thread_cache_entry = (CapabilitiesCacheEntry)thread_cache_entries.get();
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if (thread_cache_entry == null) {
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thread_cache_entry = new CapabilitiesCacheEntry();
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thread_cache_entries.set(thread_cache_entry);
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}
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thread_cache_entry.owner = Thread.currentThread();
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thread_cache_entry.capabilities = capabilities;
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fast_path_cache = thread_cache_entry;
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2005-02-16 11:04:29 -05:00
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}
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2005-02-17 04:44:06 -05:00
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/**
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* Helper method to get a pointer to a named function in the OpenGL library
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* with a name dependent on the current platform
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*/
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static long getPlatformSpecificFunctionAddress(String function_prefix, String[] os_prefixes, String[] os_function_prefixes, String function) {
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2005-05-30 12:21:05 -04:00
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String os_name = (String)AccessController.doPrivileged(new PrivilegedAction() {
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public Object run() {
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return System.getProperty("os.name");
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}
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});
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2005-02-17 04:44:06 -05:00
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for (int i = 0; i < os_prefixes.length; i++)
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if (os_name.startsWith(os_prefixes[i])) {
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String platform_function_name = function.replaceFirst(function_prefix, os_function_prefixes[i]);
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long address = getFunctionAddress(platform_function_name);
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return address;
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}
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return 0;
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}
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2005-02-16 11:04:29 -05:00
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/**
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* Helper method to get a pointer to a named function in the OpenGL library
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*/
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static native long getFunctionAddress(String name);
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2004-02-18 12:48:26 -05:00
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/**
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2005-02-16 07:58:40 -05:00
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* Determine which extensions are available. Helper method to ContextCapabilities.
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2004-09-09 19:51:16 -04:00
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*
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2005-02-16 07:58:40 -05:00
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* @return A Set containing all available extension strings.
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2004-02-18 12:48:26 -05:00
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*/
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2005-02-16 07:58:40 -05:00
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static Set getSupportedExtensions() {
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Set supported_extensions = new HashSet();
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String extensions_string = GL11.glGetString(GL11.GL_EXTENSIONS);
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2005-02-21 09:46:47 -05:00
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if (extensions_string == null)
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throw new IllegalStateException("glGetString(GL_EXTENSIONS) returned null - is there a context current?");
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2005-02-16 07:58:40 -05:00
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StringTokenizer tokenizer = new StringTokenizer(extensions_string);
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while ( tokenizer.hasMoreTokens() ) {
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String extension_string = tokenizer.nextToken();
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supported_extensions.add(extension_string);
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2004-07-05 10:34:47 -04:00
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}
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2004-09-09 19:51:16 -04:00
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String version = GL11.glGetString(GL11.GL_VERSION);
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2005-01-12 03:58:41 -05:00
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if (version == null)
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throw new IllegalStateException("glGetString(GL_VERSION) returned null - possibly caused by missing current context.");
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2004-09-13 04:04:33 -04:00
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StringTokenizer version_tokenizer = new StringTokenizer(version, ". ");
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String major_string = version_tokenizer.nextToken();
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String minor_string = version_tokenizer.nextToken();
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2004-09-09 19:51:16 -04:00
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2005-08-29 16:14:59 -04:00
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int majorVersion = 0;
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int minorVersion = 0;
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try {
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majorVersion = Integer.parseInt(major_string);
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minorVersion = Integer.parseInt(minor_string);
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} catch (NumberFormatException e) {
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LWJGLUtil.log("The major and/or minor OpenGL version is malformed: " + e.getMessage());
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}
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2004-09-09 19:51:16 -04:00
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2005-01-12 03:58:41 -05:00
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if (majorVersion == 2) {
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2004-09-09 19:51:16 -04:00
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// ----------------------[ 2.X ]----------------------
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2005-02-16 07:58:40 -05:00
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supported_extensions.add("OpenGL20");
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2004-09-09 19:51:16 -04:00
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// ----------------------[ 1.X ]----------------------
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2005-02-16 07:58:40 -05:00
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supported_extensions.add("OpenGL11");
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supported_extensions.add("OpenGL12");
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supported_extensions.add("OpenGL13");
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supported_extensions.add("OpenGL14");
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supported_extensions.add("OpenGL15");
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2004-09-09 19:51:16 -04:00
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} else {
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2005-01-12 03:58:41 -05:00
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switch (minorVersion) {
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2004-09-09 19:51:16 -04:00
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case 5:
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2005-02-16 07:58:40 -05:00
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supported_extensions.add("OpenGL15");
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2004-09-11 08:05:25 -04:00
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// Intentional fall through
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2004-09-09 19:51:16 -04:00
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case 4:
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2005-02-16 07:58:40 -05:00
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supported_extensions.add("OpenGL14");
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2004-09-11 08:05:25 -04:00
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// Intentional fall through
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2004-09-09 19:51:16 -04:00
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case 3:
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2005-02-16 07:58:40 -05:00
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supported_extensions.add("OpenGL13");
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2004-09-11 08:05:25 -04:00
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// Intentional fall through
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2004-09-09 19:51:16 -04:00
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case 2:
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2005-02-16 07:58:40 -05:00
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supported_extensions.add("OpenGL12");
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// Intentional fall through
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case 1:
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supported_extensions.add("OpenGL11");
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2004-07-06 12:57:37 -04:00
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}
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2004-07-03 17:12:33 -04:00
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}
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2005-02-16 07:58:40 -05:00
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return supported_extensions;
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2004-07-03 17:12:33 -04:00
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}
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2005-02-16 07:58:40 -05:00
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/**
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* Helper method to ContextCapabilities. It will try to initialize the native stubs,
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* and remove the given extension name from the extension set if the initialization fails.
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*/
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2005-05-30 12:21:05 -04:00
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static void initNativeStubs(final Class extension_class, Set supported_extensions, String ext_name) {
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2005-02-16 07:58:40 -05:00
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resetNativeStubs(extension_class);
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if (supported_extensions.contains(ext_name)) {
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2004-07-03 17:12:33 -04:00
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try {
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2005-05-30 12:21:05 -04:00
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AccessController.doPrivileged(new PrivilegedExceptionAction() {
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public Object run() throws Exception {
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Method init_stubs_method = extension_class.getDeclaredMethod("initNativeStubs", null);
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init_stubs_method.invoke(null, null);
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return null;
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}
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});
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2004-07-03 17:12:33 -04:00
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} catch (Exception e) {
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2005-03-29 13:09:33 -05:00
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LWJGLUtil.log("Failed to initialize extension " + extension_class + " - exception: " + e);
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2005-02-16 07:58:40 -05:00
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supported_extensions.remove(ext_name);
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2004-07-03 17:12:33 -04:00
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}
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}
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2005-02-16 07:58:40 -05:00
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}
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/**
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* Makes a GL context the current LWJGL context by loading GL function pointers. The context must be current before a call to
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* this method! Instead it simply ensures that the current context is reflected accurately by GLContext's extension caps and
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* function pointers. Use useContext(null) when no context is active. <p>If the context is the same as last time, then this is
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* a no-op. <p>If the context has not been encountered before it will be fully initialized from scratch. Otherwise a cached set
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* of caps and function pointers will be used. <p>The reference to the context is held in a weak reference; therefore if no
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* strong reference exists to the GL context it will automatically be forgotten by the VM at an indeterminate point in the
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* future, freeing up a little RAM.
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*
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* @param context The context object, which uniquely identifies a GL context. If context is null, the native stubs are
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* unloaded.
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*
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* @throws LWJGLException if context non-null, and the gl library can't be loaded or the basic GL11 functions can't be loaded
|
|
|
|
*/
|
2005-02-17 06:09:40 -05:00
|
|
|
public static synchronized void useContext(Object context) throws LWJGLException {
|
2005-02-17 05:27:13 -05:00
|
|
|
if (context == null) {
|
2005-02-16 07:58:40 -05:00
|
|
|
ContextCapabilities.unloadAllStubs();
|
2005-02-16 16:28:57 -05:00
|
|
|
setCapabilities(null);
|
|
|
|
if (did_auto_load)
|
2005-02-16 07:58:40 -05:00
|
|
|
unloadOpenGLLibrary();
|
2004-07-26 10:50:33 -04:00
|
|
|
return;
|
2004-07-04 04:39:09 -04:00
|
|
|
}
|
2005-02-17 05:27:13 -05:00
|
|
|
if (gl_ref_count == 0) {
|
2005-02-16 07:58:40 -05:00
|
|
|
loadOpenGLLibrary();
|
|
|
|
did_auto_load = true;
|
|
|
|
}
|
|
|
|
try {
|
2005-02-17 06:09:40 -05:00
|
|
|
ContextCapabilities capabilities = (ContextCapabilities)capability_cache.get(context);
|
|
|
|
if (capabilities == null) {
|
|
|
|
/*
|
|
|
|
* The capabilities object registers itself as current. This behaviour is caused
|
|
|
|
* by a chicken-and-egg situation where the constructor needs to call GL functions
|
|
|
|
* as part of its capability discovery, but GL functions cannot be called before
|
|
|
|
* a capabilities object has been set.
|
|
|
|
*/
|
|
|
|
new ContextCapabilities();
|
|
|
|
capability_cache.put(context, getCapabilities());
|
|
|
|
} else
|
|
|
|
setCapabilities(capabilities);
|
2005-02-16 07:58:40 -05:00
|
|
|
} catch (LWJGLException e) {
|
2005-02-17 06:09:40 -05:00
|
|
|
if (did_auto_load)
|
2005-02-16 07:58:40 -05:00
|
|
|
unloadOpenGLLibrary();
|
|
|
|
throw e;
|
|
|
|
}
|
2004-07-03 17:12:33 -04:00
|
|
|
}
|
|
|
|
|
2004-11-09 16:29:17 -05:00
|
|
|
/** If the OpenGL reference count is 0, the library is loaded. The reference count is then incremented. */
|
2005-02-17 06:09:40 -05:00
|
|
|
public static synchronized void loadOpenGLLibrary() throws LWJGLException {
|
|
|
|
if (gl_ref_count == 0)
|
2004-07-05 10:34:47 -04:00
|
|
|
nLoadOpenGLLibrary();
|
|
|
|
gl_ref_count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
private static native void nLoadOpenGLLibrary() throws LWJGLException;
|
|
|
|
|
2004-11-09 16:29:17 -05:00
|
|
|
/** The OpenGL library reference count is decremented, and if it reaches 0, the library is unloaded. */
|
2005-02-17 06:09:40 -05:00
|
|
|
public static synchronized void unloadOpenGLLibrary() {
|
2004-07-05 10:34:47 -04:00
|
|
|
gl_ref_count--;
|
2004-09-09 19:51:16 -04:00
|
|
|
if ( gl_ref_count == 0 )
|
2004-07-05 10:34:47 -04:00
|
|
|
nUnloadOpenGLLibrary();
|
|
|
|
}
|
|
|
|
|
|
|
|
private static native void nUnloadOpenGLLibrary();
|
2004-07-03 17:12:33 -04:00
|
|
|
|
2004-11-09 16:29:17 -05:00
|
|
|
/** Native method to clear native stub bindings */
|
2005-02-16 07:58:40 -05:00
|
|
|
static native void resetNativeStubs(Class clazz);
|
2005-08-07 08:19:09 -04:00
|
|
|
|
|
|
|
private final static class CapabilitiesCacheEntry {
|
|
|
|
Thread owner;
|
|
|
|
ContextCapabilities capabilities;
|
|
|
|
}
|
2004-02-18 12:48:26 -05:00
|
|
|
}
|