Posted by Martin on Dec 01, 2021; 4:21pm
URL: https://forum.jogamp.org/Selecting-the-highest-possible-GL-profile-at-runtime-tp4041302p4041511.html

I have been a bit further on trying to tunderstanding why I can't call gl.getGL2() when gl is a GL4bc.

 When using :
GLProfile glp = GLProfile.getMaxProgrammable(true);
-Djogl.disable.openglcore=true

Then

drawable.getContext().isGLCompatibilityProfile(); returns false, which shouldn't be.

I looked at gl.getGL2(), which will check context.isGL2() before throwing the exception "not a GL2 implementation", and I see

public final boolean isGL2() {
      return 0 != ( ctxOptions & CTX_PROFILE_COMPAT ) && ctxVersion.getMajor()>=1 ;
}

with ctxOptions : 0x4C45 (which is ...0101)
and CTX_PROFILE_COMPAT : 0x2 (which is 10)

so I presume the problem comes from this ctxOptions value. I could not locate exactly where it is set, seamingly somewhere around GLContextImpl.createContextARB

The complete GLContext is

MacOSXCGLContext [Version 4.1 (Core profile, arb, compat[ES2, ES3], FBO, hardware) - 4.1 Metal - 71.6.4 [GL 4.1.0, vendor 71.6.4 (Metal - 71.6.4)], options 0x4c05, this 0x68bbe345, handle 0x122d1d180, isShared false, jogamp.opengl.gl4.GL4bcImpl@26aa12dd,
         quirks: [NoOffscreenBitmap, GL4NeedsGL3Request, NeedSharedObjectSync],
        Drawable: ResizeableImpl[Initialized true, realized true, texUnit 0, samples 0,
        Factory   jogamp.opengl.macosx.cgl.MacOSXCGLDrawableFactory@3fd7a715,
        Handle    0x0,
        Caps      GLCaps[rgba 8/8/8/0, opaque, accum-rgba 0/0/0/0, dp/st/ms 16/0/0, dbl, mono  , hw, GLProfile[GL4/GL4.hw], offscr[fbo]],
        fboI back 1, front 0, num 2,
        FBO front read 1, FBO[name r/w 1/1, init true, bound false, size 100x100, samples 0/4, modified false/false, depth RenderAttachment[type DEPTH, format 0x81a5, samples 0, 100x100, name 0x1, obj 0x51cdd8a], stencil null, colorbuffer attachments: 1/8, with 1 textures: [TextureAttachment[type COLOR_TEXTURE, target GL_TEXTURE_2D, level 0, format 0x8051, 100x100, border 0, dataFormat 0x1907, dataType 0x1401; min/mag 0x2600/0x2600, wrap S/T 0x812f/0x812f; name 0x1, obj 0x711f39f9], null, null, null, null, null, null, null], msaa[null, hasSink false, dirty true], state OK, obj 0xd44fc21],
        FBO back  write 2, FBO[name r/w 2/2, init true, bound true, size 100x100, samples 0/4, modified true/true, depth RenderAttachment[type DEPTH, format 0x81a5, samples 0, 100x100, name 0x2, obj 0x2d6eabae], stencil null, colorbuffer attachments: 1/8, with 1 textures: [TextureAttachment[type COLOR_TEXTURE, target GL_TEXTURE_2D, level 0, format 0x8051, 100x100, border 0, dataFormat 0x1907, dataType 0x1401; min/mag 0x2600/0x2600, wrap S/T 0x812f/0x812f; name 0x2, obj 0x23faf8f2], null, null, null, null, null, null, null], msaa[null, hasSink false, dirty true], state OK, obj 0x4e7dc304],
        Surface   WrappedSurface[ displayHandle 0x0
, surfaceHandle 0x0
, size 100x100
, UOB[ OWNS_SURFACE | OWNS_DEVICE | WINDOW_INVISIBLE | SURFACELESS ]
, MacOSXCGLGraphicsConfiguration[DefaultGraphicsScreen[MacOSXGraphicsDevice[type .macosx, connection decon, unitID 0, handle 0x0, owner false, NullToolkitLock[obj 0x64729b1e]], idx 0],
        chosen    GLCaps[rgba 8/8/8/0, opaque, accum-rgba 0/0/0/0, dp/st/ms 16/0/0, dbl, mono  , hw, GLProfile[GL4/GL4.hw], offscr[fbo]],
        requested GLCaps[rgba 8/8/8/0, opaque, accum-rgba 0/0/0/0, dp/st/ms 16/0/0, dbl, mono  , hw, GLProfile[GL4/GL4.hw], offscr[auto-cfg]]]
, surfaceLock <10bbd20a, 48503868>[count 1, qsz 0, owner <main>]
, GenericUpstreamSurfacelessHook[pixel 100x100]
, upstreamSurface false ]], mode NSOPENGL]


I am on MacOS BigSur + Silicon.