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/*
* 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();
}
}
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