Fix Bug 862: Fix GL Version Validation / NVidia GTX550 driver 331.13 - 64bit Linux - No compatibility GLProfile (GL2, >= GL3bc)

Fix GL Version Validation:
  We shall not rely on our known good versions when validating a queried GL context version,
  but allow some 'room' for a higher version post JOGL release while still
  cutting off 'odd versions'.

  While GL version detection, we always iterate from the highest known version
  down to the lowest. Hence 'GLContext.isValidGLVersion(..)' is satisfied
  by validating the lowest version number but allowing a higher than known one.

  Now we would return 'invalid' for a version >= 6.

  It is enough to clip to the maximum known version when iterating,
  allowing the highest unknown version to be available.

  GLContext.isValidGLVersion(..):
    Returns true, if the major.minor is not inferior to the lowest
    valid version and does not exceed the highest known major number by more than one.

    The minor version number is ignored by the upper limit validation
    and the major version number may exceed by one.

    The upper limit check is relaxed since we don't want to cut-off
    unforseen new GL version since the release of JOGL.

    Hence it is important to iterate through GL version from the upper limit
    and 'decrementGLVersion(..)' until invalid.

Add GL Version 4.4 to valid known versions.

Remove ES3 desktop detection, which is impossible
  Regression of commit 3a0d7703da32e9a5ddf08a334f18588a78038d88 (ES3 support)

6 files changed, 119 insertions, 98 deletions

diff --git a/make/scripts/tests-win.bat b/make/scripts/tests-win.bat
index c1da671b1..90226c28d 100755
--- a/make/scripts/tests-win.bat
+++ b/make/scripts/tests-win.bat
@@ -65,7 +65,7 @@ REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.tile.TestTiledPrintin
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.gl2.newt.TestGearsNewtAWTWrapper %*
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.gl2.newt.TestGearsNEWT -time 30000
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es1.newt.TestGearsES1NEWT %*
-REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.newt.TestGearsES2NEWT %*
+scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.newt.TestGearsES2NEWT %*
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.newt.TestGearsES2NEWT -vsync -time 4000 -x 10 -y 10 -width 100 -height 100 -screen 0
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.newt.TestGearsES2NEWT -vsync -time 40000 -width 100 -height 100 -screen 0 %*
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.gl2.awt.TestGearsAWT -time 5000
@@ -134,7 +134,7 @@ REM scripts\java-win.bat com.jogamp.opengl.test.junit.newt.mm.TestScreenMode02aN
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.newt.mm.TestScreenMode02bNEWT %*
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.newt.mm.ManualScreenMode03sNEWT %*
 
-scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.av.MovieSimple %*
+REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.av.MovieSimple %*
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.av.MovieCube %*
 REM scripts\java-win.bat com.jogamp.opengl.test.junit.jogl.demos.es2.TexCubeES2 %*
 
diff --git a/make/scripts/tests-x64-dbg.bat b/make/scripts/tests-x64-dbg.bat
index f7ee7b995..7c30d4db3 100755
--- a/make/scripts/tests-x64-dbg.bat
+++ b/make/scripts/tests-x64-dbg.bat
@@ -20,6 +20,7 @@ set CP_ALL=.;%BLD_DIR%\jar\jogl-all.jar;%BLD_DIR%\jar\jogl-test.jar;..\..\joal\%
 

 echo CP_ALL %CP_ALL%

 

+set D_ARGS="-Djogamp.debug=all"

 REM set D_ARGS="-Djogl.debug.GLContext" "-Djogl.debug.FBObject"

 REM set D_ARGS="-Djogl.debug.GLDrawable" "-Djogl.debug.EGLDrawableFactory.DontQuery"

 REM set D_ARGS="-Djogl.debug.GLDrawable" "-Djogl.debug.EGLDrawableFactory.QueryNativeTK"

@@ -52,7 +53,7 @@ REM set D_ARGS="-Djogl.debug.GLCanvas" "-Djogl.debug.GLJPanel" "-Djogl.debug.Til
 REM set D_ARGS="-Djogl.debug.GLCanvas" "-Djogl.debug.GLJPanel" "-Djogl.debug.TileRenderer"

 REM set D_ARGS="-Dnewt.debug.Window"

 REM set D_ARGS="-Dnewt.debug.Window.KeyEvent"

-set D_ARGS="-Dnewt.debug.Window.MouseEvent"

+REM set D_ARGS="-Dnewt.debug.Window.MouseEvent"

 REM set D_ARGS="-Dnewt.debug.Window.MouseEvent" "-Dnewt.debug.Window.KeyEvent"

 REM set D_ARGS="-Dnewt.debug.Window" "-Dnewt.debug.Display"

 REM set D_ARGS="-Djogl.debug.GLDebugMessageHandler" "-Djogl.debug.DebugGL" "-Djogl.debug.TraceGL"

diff --git a/make/scripts/tests.sh b/make/scripts/tests.sh
index 9ada56c45..ece235a60 100644
--- a/make/scripts/tests.sh
+++ b/make/scripts/tests.sh
@@ -153,10 +153,9 @@ function jrun() {
     #D_ARGS="-Dnativewindow.debug.GraphicsConfiguration -Dnativewindow.debug.NativeWindow"
     #D_ARGS="-Djogl.debug.GLCanvas -Djogl.debug.Animator -Djogl.debug.GLDrawable -Djogl.debug.GLContext -Djogl.debug.GLContext.TraceSwitch"
     #D_ARGS="-Djogl.debug.GLContext -Djogl.debug.ExtensionAvailabilityCache"
-    ##D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLProfile -Djogl.debug.GLDrawable -Djogl.debug.EGLDisplayUtil"
-    ##D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLProfile"
+    #D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLProfile -Djogl.debug.GLDrawable -Djogl.debug.EGLDisplayUtil"
     #D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLProfile -Djogl.debug.GLDrawable"
-    #D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLProfile"
+    D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLProfile"
     #D_ARGS="-Djogl.debug.GLProfile"
     #D_ARGS="-Dnativewindow.debug.NativeWindow -Dnewt.debug.Window -Dnewt.debug.Screen -Dnewt.debug.Display"
     #D_ARGS="-Djogl.debug.GLCanvas -Dnewt.debug.Window -Dnewt.debug.Display -Dnewt.debug.EDT -Djogl.debug.Animator"
@@ -314,7 +313,7 @@ function testawtswt() {
 #testawt com.jogamp.opengl.test.junit.jogl.demos.gl2.awt.TestGearsGLJPanelAWT $*
 #testawt com.jogamp.opengl.test.junit.jogl.demos.gl2.awt.TestGearsGLJPanelAWTBug450 $*
 #testawt com.jogamp.opengl.test.junit.jogl.demos.gl2.newt.TestGearsNewtAWTWrapper $*
-#testnoawt com.jogamp.opengl.test.junit.jogl.demos.gl2.newt.TestGearsNEWT $*
+testnoawt com.jogamp.opengl.test.junit.jogl.demos.gl2.newt.TestGearsNEWT $*
 #testnoawt com.jogamp.opengl.test.junit.jogl.demos.gl2.newt.TestTeapotNEWT $*
 #testnoawt com.jogamp.opengl.test.junit.jogl.demos.gl3.newt.TestGeomShader01TextureGL3NEWT $*
 
@@ -323,7 +322,7 @@ function testawtswt() {
 #
 #testnoawt jogamp.opengl.openal.av.ALDummyUsage $*
 #testnoawt com.jogamp.opengl.test.junit.jogl.demos.es2.av.MovieCube $*
-testnoawt com.jogamp.opengl.test.junit.jogl.demos.es2.av.MovieSimple $*
+#testnoawt com.jogamp.opengl.test.junit.jogl.demos.es2.av.MovieSimple $*
 
 #
 # tile rendring / printing w/ & w/o AWT
diff --git a/src/jogl/classes/javax/media/opengl/GLContext.java b/src/jogl/classes/javax/media/opengl/GLContext.java
index bd6867359..9f2e96781 100644
--- a/src/jogl/classes/javax/media/opengl/GLContext.java
+++ b/src/jogl/classes/javax/media/opengl/GLContext.java
@@ -1362,7 +1362,7 @@ public abstract class GLContext {
       /* 1.*/ { 0, 1, 2, 3, 4, 5 },
       /* 2.*/ { 0, 1 },
       /* 3.*/ { 0, 1, 2, 3 },
-      /* 4.*/ { 0, 1, 2, 3 } };
+      /* 4.*/ { 0, 1, 2, 3, 4 } };
 
   public static final int ES_VERSIONS[][] = {
       /* 0.*/ { -1 },
@@ -1387,51 +1387,100 @@ public abstract class GLContext {
       }
   }
 
+  /**
+   * Returns true, if the major.minor is not inferior to the lowest
+   * valid version and does not exceed the highest known major number by more than one.
+   * <p>
+   * The minor version number is ignored by the upper limit validation
+   * and the major version number may exceed by one.
+   * </p>
+   * <p>
+   * The upper limit check is relaxed since we don't want to cut-off
+   * unforseen new GL version since the release of JOGL.
+   * </p>
+   * <p>
+   * Hence it is important to iterate through GL version from the upper limit
+   * and {@link #decrementGLVersion(int, int[], int[])} until invalid.
+   * </p>
+   */
   public static final boolean isValidGLVersion(int ctxProfile, int major, int minor) {
       if( 1>major || 0>minor ) {
           return false;
       }
-      if( ( 0 != ( CTX_PROFILE_ES & ctxProfile ) ) ) {
-          if( major>=ES_VERSIONS.length) return false;
-          if( minor>=ES_VERSIONS[major].length) return false;
+      if( 0 != ( CTX_PROFILE_ES & ctxProfile ) ) {
+          if( major >= ES_VERSIONS.length + 1 ) return false;
       } else {
-          if( major>=GL_VERSIONS.length) return false;
-          if( minor>=GL_VERSIONS[major].length) return false;
+          if( major>=GL_VERSIONS.length + 1 ) return false;
       }
       return true;
   }
 
-  public static final boolean decrementGLVersion(int ctxProfile, int major[], int minor[]) {
-      if(null==major || major.length<1 ||null==minor || minor.length<1) {
-          throw new GLException("invalid array arguments");
-      }
-      int m = major[0];
-      int n = minor[0];
-      if( !isValidGLVersion(ctxProfile, m, n) ) {
-          return false;
+  /**
+   * Clip the given GL version to the maximum known valid version if exceeding.
+   * @return true if clipped, i.e. given value exceeds maximum, otherwise false.
+   */
+  public static final boolean clipGLVersion(int ctxProfile, int major[], int minor[]) {
+      final int m = major[0];
+      final int n = minor[0];
+
+      if( 0 != ( CTX_PROFILE_ES & ctxProfile ) ) {
+          if( m >= ES_VERSIONS.length ) {
+              major[0] = ES_VERSIONS.length - 1;
+              minor[0] = ES_VERSIONS[major[0]].length - 1;
+              return true;
+          }
+          if( n  >= ES_VERSIONS[m].length ) {
+              minor[0] = ES_VERSIONS[m].length - 1;
+              return true;
+          }
+      } else if( m >= GL_VERSIONS.length ) { // !isES
+          major[0] = GL_VERSIONS.length - 1;
+          minor[0] = GL_VERSIONS[major[0]].length - 1;
+          return true;
+      } else if( n  >= GL_VERSIONS[m].length ) { // !isES
+          minor[0] = GL_VERSIONS[m].length - 1;
+          return true;
       }
+      return false;
+  }
 
-      // decrement ..
-      n -= 1;
-      if(n < 0) {
-          if( ( 0 != ( CTX_PROFILE_ES & ctxProfile ) ) ) {
-              if( m >= 3) {
-                  m -= 1;
+  /**
+   * Decrement the given GL version by one
+   * and return true if still valid, otherwise false.
+   * <p>
+   * If the given version exceeds the maximum known valid version,
+   * it is {@link #clipGLVersion(int, int[], int[]) clipped} and
+   * true is returned.
+   * </p>
+   *
+   * @param ctxProfile
+   * @param major
+   * @param minor
+   * @return
+   */
+  public static final boolean decrementGLVersion(int ctxProfile, int major[], int minor[]) {
+      if( !clipGLVersion(ctxProfile, major, minor) ) {
+          int m = major[0];
+          int n = minor[0] - 1;
+          if(n < 0) {
+              if( 0 != ( CTX_PROFILE_ES & ctxProfile ) ) {
+                  if( m >= 3 ) {
+                      m -= 1;
+                  } else {
+                      m = 0; // major decr [1,2] -> 0
+                  }
+                  n = ES_VERSIONS[m].length-1;
               } else {
-                  m = 0; // major decr [1,2] -> 0
+                  m -= 1;
+                  n = GL_VERSIONS[m].length-1;
               }
-              n = ES_VERSIONS[m].length-1;
-          } else {
-              m -= 1;
-              n = GL_VERSIONS[m].length-1;
           }
+          if( !isValidGLVersion(ctxProfile, m, n) ) {
+              return false;
+          }
+          major[0]=m;
+          minor[0]=n;
       }
-      if( !isValidGLVersion(ctxProfile, m, n) ) {
-          return false;
-      }
-      major[0]=m;
-      minor[0]=n;
-
       return true;
   }
 
diff --git a/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java b/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java
index b8bcd2e78..8d3d207ee 100644
--- a/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java
+++ b/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java
@@ -223,14 +223,13 @@ final class ExtensionAvailabilityCache {
       final VersionNumber version = context.getGLVersionNumber();
       int major[] = new int[] { version.getMajor() };
       int minor[] = new int[] { version.getMinor() };
-      while (GLContext.isValidGLVersion(ctxOptions, major[0], minor[0])) {
+      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");
           }
-          if(!GLContext.decrementGLVersion(ctxOptions, major, minor)) break;
-      }
+      } 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
@@ -248,7 +247,7 @@ final class ExtensionAvailabilityCache {
   private int glExtensionCount = 0;
   private String glXExtensions = null;
   private int glXExtensionCount = 0;
-  private HashSet<String> availableExtensionCache = new HashSet<String>(50);
+  private final HashSet<String> availableExtensionCache = new HashSet<String>(50);
 
   static String getThreadName() { return Thread.currentThread().getName(); }
 
diff --git a/src/jogl/classes/jogamp/opengl/GLContextImpl.java b/src/jogl/classes/jogamp/opengl/GLContextImpl.java
index 5f487fa6d..911a4c2be 100644
--- a/src/jogl/classes/jogamp/opengl/GLContextImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLContextImpl.java
@@ -853,7 +853,6 @@ public abstract class GLContextImpl extends GLContext {
         boolean hasGL2   = false;
         boolean hasGL4   = false;
         boolean hasGL3   = false;
-        boolean hasES3   = false;
 
         // Even w/ PROFILE_ALIASING, try to use true core GL profiles
         // ensuring proper user behavior across platforms due to different feature sets!
@@ -922,13 +921,6 @@ public abstract class GLContextImpl extends GLContext {
                 resetStates(false); // clean this context states, since creation was temporary
             }
         }
-        if(!hasES3) {
-            hasES3   = createContextARBMapVersionsAvailable(3, CTX_PROFILE_ES);  // ES3
-            success |= hasES3;
-            if(hasES3) {
-                resetStates(false); // clean this context states, since creation was temporary
-            }
-        }
         if(success) {
             // only claim GL versions set [and hence detected] if ARB context creation was successful
             GLContext.setAvailableGLVersionsSet(device);
@@ -1023,8 +1015,7 @@ public abstract class GLContextImpl extends GLContext {
     minor[0]=minorMax;
     long _context=0;
 
-    while ( GLContext.isValidGLVersion(ctxOptionFlags, major[0], minor[0]) &&
-            ( major[0]>majorMin || major[0]==majorMin && minor[0] >=minorMin ) ) {
+    do {
         if (DEBUG) {
             System.err.println(getThreadName() + ": createContextARBVersions: share "+share+", direct "+direct+", version "+major[0]+"."+minor[0]);
         }
@@ -1039,10 +1030,8 @@ public abstract class GLContextImpl extends GLContext {
             }
         }
 
-        if(!GLContext.decrementGLVersion(ctxOptionFlags, major, minor)) {
-            break;
-        }
-    }
+    } while ( ( major[0]>majorMin || major[0]==majorMin && minor[0] >=minorMin ) &&
+              GLContext.decrementGLVersion(ctxOptionFlags, major, minor) );
     return _context;
   }
 
@@ -1059,10 +1048,6 @@ public abstract class GLContextImpl extends GLContext {
       if ( 0 == ctp ) {
         throw new GLException("Invalid GL Version "+major+"."+minor+", ctp "+toHexString(ctp));
       }
-
-      if (!GLContext.isValidGLVersion(ctp, major, minor)) {
-        throw new GLException("Invalid GL Version "+major+"."+minor+", ctp "+toHexString(ctp));
-      }
       ctxVersion = new VersionNumber(major, minor, 0);
       ctxVersionString = getGLVersion(major, minor, ctp, glVersion);
       ctxVendorVersion = glVendorVersion;
@@ -1244,16 +1229,6 @@ public abstract class GLContextImpl extends GLContext {
   }
 
   /**
-   * We cannot promote a non ARB context to >= 3.1, reduce it to 3.0 then.
-   */
-  private static void limitNonARBContextVersion(int[] major, int[] minor, int ctp) {
-      if ( 0 == (ctp & CTX_IS_ARB_CREATED) && ( major[0] > 3 || major[0] == 3 && minor[0] >= 1 ) ) {
-          major[0] = 3;
-          minor[0] = 0;
-      }
-  }
-
-  /**
    * Returns null if version string is invalid, otherwise a valid instance.
    * <p>
    * Note: Non ARB ctx is limited to GL 3.0.
@@ -1265,7 +1240,6 @@ public abstract class GLContextImpl extends GLContext {
           if ( version.isValid() ) {
               int[] major = new int[] { version.getMajor() };
               int[] minor = new int[] { version.getMinor() };
-              limitNonARBContextVersion(major, minor, ctp);
               if ( GLContext.isValidGLVersion(ctp, major[0], minor[0]) ) {
                   return new VersionNumber(major[0], minor[0], 0);
               }
@@ -1297,7 +1271,6 @@ public abstract class GLContextImpl extends GLContext {
     } else {
         glGetIntegervInt(GL2GL3.GL_MAJOR_VERSION, glIntMajor, 0, _glGetIntegerv);
         glGetIntegervInt(GL2GL3.GL_MINOR_VERSION, glIntMinor, 0, _glGetIntegerv);
-        limitNonARBContextVersion(glIntMajor, glIntMinor, ctp);
         return true;
     }
   }
@@ -1395,21 +1368,21 @@ public abstract class GLContextImpl extends GLContext {
             }
         }
         if (DEBUG) {
-            System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: version verification (Int): "+glVersion+", "+glIntMajor[0]+"."+glIntMinor[0]);
+            System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: Version verification (Int): "+glVersion+", "+glIntMajor[0]+"."+glIntMinor[0]);
         }
 
         // Only validate if a valid int version was fetched, otherwise cont. w/ version-string method -> 3.0 > Version || Version > MAX!
         if ( GLContext.isValidGLVersion(ctxProfileBits, glIntMajor[0], glIntMinor[0]) ) {
-            if( glIntMajor[0]<major || ( glIntMajor[0]==major && glIntMinor[0]<minor ) || 0 == major ) {
-                if( strictMatch && 2 < major ) { // relaxed match for versions major < 3 requests, last resort!
-                    if(DEBUG) {
-                        System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, GL version mismatch (Int): "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion+", "+glIntMajor[0]+"."+glIntMinor[0]);
-                    }
-                    return false;
+            // relaxed match for versions major < 3 requests, last resort!
+            if( strictMatch && major >= 3 && glIntMajor[0]<major || ( glIntMajor[0]==major && glIntMinor[0]<minor ) ) {
+                if(DEBUG) {
+                    System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, GL version mismatch (Int): "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion+", "+glIntMajor[0]+"."+glIntMinor[0]);
                 }
-                major = glIntMajor[0];
-                minor = glIntMinor[0];
+                return false;
             }
+            // Use returned GL version!
+            major = glIntMajor[0];
+            minor = glIntMinor[0];
             versionValidated = true;
         } else {
             versionGL3IntFailed = true;
@@ -1417,44 +1390,44 @@ public abstract class GLContextImpl extends GLContext {
     }
     if( !versionValidated ) {
         // Validate the requested version w/ the GL-version from the version string.
-        final VersionNumber setGLVersionNumber = new VersionNumber(major, minor, 0);
-        final VersionNumber strGLVersionNumber = getGLVersionNumber(ctxProfileBits, glVersion);
+        final VersionNumber expGLVersionNumber = new VersionNumber(major, minor, 0);
+        final VersionNumber hasGLVersionNumber = getGLVersionNumber(ctxProfileBits, glVersion);
         if (DEBUG) {
-            System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: version verification (String): "+glVersion+", "+strGLVersionNumber);
+            System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: Version verification (String): "+glVersion+", "+hasGLVersionNumber);
         }
 
         // Only validate if a valid string version was fetched -> MIN > Version || Version > MAX!
-        if( null != strGLVersionNumber ) {
-            if( strGLVersionNumber.compareTo(setGLVersionNumber) < 0 || 0 == major ) {
-                if( strictMatch && 2 < major ) { // relaxed match for versions major < 3 requests, last resort!
-                    if(DEBUG) {
-                        System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, GL version mismatch (String): "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion+", "+strGLVersionNumber);
-                    }
-                    return false;
+        if( null != hasGLVersionNumber ) {
+            // relaxed match for versions major < 3 requests, last resort!
+            if( strictMatch && major >= 3 && hasGLVersionNumber.compareTo(expGLVersionNumber) < 0 ) {
+                if(DEBUG) {
+                    System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, GL version mismatch (String): "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion+", "+hasGLVersionNumber);
                 }
-                major = strGLVersionNumber.getMajor();
-                minor = strGLVersionNumber.getMinor();
+                return false;
             }
             if( strictMatch && versionGL3IntFailed && major >= 3 ) {
                 if(DEBUG) {
-                    System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, GL3 version Int failed, String: "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion+", "+strGLVersionNumber);
+                    System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, GL3 version Int failed, String: "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion+", "+hasGLVersionNumber);
                 }
                 return false;
             }
+            // Use returned GL version!
+            major = hasGLVersionNumber.getMajor();
+            minor = hasGLVersionNumber.getMinor();
             versionValidated = true;
         }
     }
-    if( strictMatch && !versionValidated && 0 < major ) {
+    if( strictMatch && !versionValidated ) {
         if(DEBUG) {
             System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.X: FAIL, No GL version validation possible: "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+" -> "+glVersion);
         }
         return false;
     }
     if (DEBUG) {
-        System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: post version verification "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+", strictMatch "+strictMatch+", versionValidated "+versionValidated+", versionGL3IntFailed "+versionGL3IntFailed);
+        System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: Post version verification "+GLContext.getGLVersion(major, minor, ctxProfileBits, null)+", strictMatch "+strictMatch+", versionValidated "+versionValidated+", versionGL3IntFailed "+versionGL3IntFailed);
     }
 
-    if( 2 > major ) { // there is no ES2/3-compat for a profile w/ major < 2
+    if( major < 2 ) { // there is no ES2/3-compat for a profile w/ major < 2
         ctxProfileBits &= ~ ( GLContext.CTX_IMPL_ES2_COMPAT | GLContext.CTX_IMPL_ES3_COMPAT ) ;
     }