FBObject: Fix depth- and stencil bit count selection for attachRenderbuffer(..);

- Fix depth- and stencil bit count selection for attachRenderbuffer(..)
  - Add generic values: DEFAULT_BITS, REQUESTED_BITS, CHOSEN_BITS, MAXIMUM_BITS

  - Refactor depth- and stencil bit-count -> format into own method

  - Allow depth- and stencil bit-count select a higher bit-count if required (fix)

- GLFBODrawable.FBOMODE_USE_DEPTH is deprecated, using GLCapabilities.[get|set]DepthBits(..)
  - It was an oversight to introduce the bit flag in the first place,
    since we should have used the capabilities depth bit-count

- Graph Test: GLEventListenerButton shall use requested capabilities for FBO drawable.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java
index 422714ac5..fbd40ebdd 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java
@@ -459,7 +459,7 @@ public class VBORegion2PMSAAES2  extends GLRegion {
             fbo.attachColorbuffer(gl, 0, true);
             if( !blendingEnabled ) {
                 // no depth-buffer w/ blending
-                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
+                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, FBObject.DEFAULT_BITS);
             }
             final FBObject ssink = new FBObject();
             {
@@ -469,7 +469,7 @@ public class VBORegion2PMSAAES2  extends GLRegion {
                 ssink.attachTexture2D(gl, 0, true, GL.GL_NEAREST, GL.GL_NEAREST, GL.GL_CLAMP_TO_EDGE, GL.GL_CLAMP_TO_EDGE);
                 if( !blendingEnabled ) {
                     // no depth-buffer w/ blending
-                    ssink.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
+                    ssink.attachRenderbuffer(gl, Attachment.Type.DEPTH, FBObject.DEFAULT_BITS);
                 }
             }
             fbo.setSamplingSink(ssink);
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java
index 5251ade39..8f1de9157 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java
@@ -580,7 +580,7 @@ public class VBORegion2PVBAAES2  extends GLRegion {
             texA = fbo.attachTexture2D(gl, 0, true, GL.GL_NEAREST, GL.GL_NEAREST, GL.GL_CLAMP_TO_EDGE, GL.GL_CLAMP_TO_EDGE);
             if( !blendingEnabled ) {
                 // no depth-buffer w/ blending
-                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
+                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, FBObject.DEFAULT_BITS);
             }
             if( DEBUG_FBO_1 ) {
                 System.err.printf("XXX.createFBO: %dx%d%n%s%n", fboWidth, fboHeight, fbo.toString());