Bug 1016 - GLJPanel Offscreen FBO size may exceed GL MAX TEXTURE SIZE, only use an FBO TextureAttachment if required

We only require an FBO TextureAttachment if using GLSL vertical flip,
otherwise we simply requires a color renderbuffer.

Further, the 'FBO fboFlipped' in GLSL vertical flip mode also simply requires a color renderbuffer.

1 files changed, 20 insertions, 5 deletions

diff --git a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
index 15f1418ad..3a1e45440 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
@@ -1530,6 +1530,7 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
       if(DEBUG) {
           System.err.println(getThreadName()+": OffscreenBackend: initialize() - frameCount "+frameCount);
       }
+      GLException glException = null;
       try {
           final GLContext[] shareWith = { null };
           if( helper.isSharedGLContextPending(shareWith) ) {
@@ -1550,6 +1551,17 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
                   } } );
           }
 
+          //
+          // Pre context configuration
+          //
+          flipVertical = !GLJPanel.this.skipGLOrientationVerticalFlip && offscreenDrawable.isGLOriented();
+          offscreenIsFBO = offscreenDrawable.getRequestedGLCapabilities().isFBO();
+          final boolean useGLSLFlip_pre = flipVertical && offscreenIsFBO && offscreenCaps.getGLProfile().isGL2ES2() && USE_GLSL_TEXTURE_RASTERIZER;
+          if( offscreenIsFBO && !useGLSLFlip_pre ) {
+              // Texture attachment only required for GLSL vertical flip, hence simply use a color-renderbuffer attachment.
+              ((GLFBODrawable)offscreenDrawable).setFBOMode(GLFBODrawable.FBOMODE_USE_DEPTH);
+          }
+
           offscreenContext = (GLContextImpl) offscreenDrawable.createContext(shareWith[0]);
           offscreenContext.setContextCreationFlags(additionalCtxCreationFlags);
           if( GLContext.CONTEXT_NOT_CURRENT < offscreenContext.makeCurrent() ) {
@@ -1557,16 +1569,14 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
               helper.setAutoSwapBufferMode(false); // we handle swap-buffers, see handlesSwapBuffer()
 
               final GL gl = offscreenContext.getGL();
-              flipVertical = !GLJPanel.this.skipGLOrientationVerticalFlip && offscreenDrawable.isGLOriented();
               final GLCapabilitiesImmutable chosenCaps = offscreenDrawable.getChosenGLCapabilities();
-              offscreenIsFBO = chosenCaps.isFBO();
               final boolean glslCompliant = !offscreenContext.hasRendererQuirk(GLRendererQuirks.GLSLNonCompliant);
-              final boolean useGLSLFlip = flipVertical && offscreenIsFBO && gl.isGL2ES2() && USE_GLSL_TEXTURE_RASTERIZER && glslCompliant;
+              final boolean useGLSLFlip = useGLSLFlip_pre && gl.isGL2ES2() && glslCompliant;
               if( DEBUG ) {
                   System.err.println(getThreadName()+": OffscreenBackend.initialize: useGLSLFlip "+useGLSLFlip+
                           " [flip "+flipVertical+", isFBO "+offscreenIsFBO+", isGL2ES2 "+gl.isGL2ES2()+
                           ", noglsl "+!USE_GLSL_TEXTURE_RASTERIZER+", glslNonCompliant "+!glslCompliant+
-                          ", isGL2ES2 " + gl.isGL2ES2()+"]");
+                          ", isGL2ES2 " + gl.isGL2ES2()+"\n "+offscreenDrawable+"]");
               }
               if( useGLSLFlip ) {
                   final GLFBODrawable fboDrawable = (GLFBODrawable) offscreenDrawable;
@@ -1574,7 +1584,7 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
                   try {
                       fboFlipped = new FBObject();
                       fboFlipped.reset(gl, fboDrawable.getSurfaceWidth(), fboDrawable.getSurfaceHeight(), 0, false);
-                      fboFlipped.attachTexture2D(gl, 0, chosenCaps.getAlphaBits()>0);
+                      fboFlipped.attachColorbuffer(gl, 0, chosenCaps.getAlphaBits()>0);
                       // fboFlipped.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
                       glslTextureRaster = new GLSLTextureRaster(fboDrawable.getTextureUnit(), true);
                       glslTextureRaster.init(gl.getGL2ES2());
@@ -1598,6 +1608,8 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
           } else {
               isInitialized = false;
           }
+      } catch( final GLException gle ) {
+          glException = gle;
       } finally {
           if( !isInitialized ) {
               if(null != offscreenContext) {
@@ -1609,6 +1621,9 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
                   offscreenDrawable = null;
               }
           }
+          if( null != glException ) {
+              throw new GLException("Handled GLException: "+glException.getMessage(), glException);
+          }
       }
     }