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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 com.jogamp.common.util.VersionNumber;
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 glExtensionSet = new HashSet(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 glXExtensionSet = new HashSet(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 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());
}
final int ctxOptions = context.getCtxOptions();
final VersionNumber version = context.getGLVersionNumber();
int major[] = new int[] { version.getMajor() };
int minor[] = new int[] { version.getMinor() };
do{
final String GL_XX_VERSION = ( context.isGLES() ? "GL_ES_VERSION_" : "GL_VERSION_" ) + major[0] + "_" + minor[0];
availableExtensionCache.add(GL_XX_VERSION);
if (DEBUG) {
System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Added "+GL_XX_VERSION+" to known extensions");
}
} while( GLContext.decrementGLVersion(ctxOptions, major, minor) );
// 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("");
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 final HashSet availableExtensionCache = new HashSet(50);
static String getThreadName() { return Thread.currentThread().getName(); }
}
