Posted by Xerxes Rånby on Mar 06, 2017; 11:47am
URL: https://forum.jogamp.org/Understanding-issue-with-automatic-buffer-swapping-tp4037728p4037742.html

I see the same issue that every second frame is using one un-cleared buffer when running the MultiViewportTest (AWT)
using Ubuntu 16.10 + AZUL 8 121 + OpenGL 4.5 compatible Mesa drivers for AMD

AsteroidSkyBoxTest and SpotLightTest is rendering fine using this setup, as well on the windows setup.
It is only the MultiViewportTest that is causing rendering on top of un-cleared buffer issues.



I am using this repository that contain Mesa 17 with OpenGL 4.5 support for AMD APU:
https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

Platform: Java Version: 1.8.0_121 (1.8.0u121), VM: OpenJDK 64-Bit Server VM, Runtime: OpenJDK Runtime Environment
Platform: Java Vendor: Azul Systems, Inc., http://www.azulsystems.com/, JavaSE: true, Java6: true, AWT enabled: true

X11GraphicsDevice[type .x11, connection :0]:
        Natives
                GL4bc false
                GL4 true [4.5 (Core profile, arb, compat[ES2, ES3, ES31, ES32], FBO, hardware)]
                GLES3 true [3.1 (ES profile, arb, compat[ES2, ES3, ES31], FBO, hardware)]
                GL3bc false
                GL3 true [4.5 (Core profile, arb, compat[ES2, ES3, ES31, ES32], FBO, hardware)]
                GL2 true [3.0 (Compat profile, arb, compat[ES2], FBO, hardware)]
                GLES2 true [3.1 (ES profile, arb, compat[ES2, ES3, ES31], FBO, hardware)]
                GLES1 true [1.1 (ES profile, arb, compat[FP32], hardware)]
                Count 6 / 8
        Common
                GL4ES3 true
                GL2GL3 true
                GL2ES2 true
                GL2ES1 true
        Mappings
                GLES1 GLProfile[GLES1/GLES1.hw]
                GLES2 GLProfile[GLES2/GLES3.hw]
                GL2ES1 GLProfile[GL2ES1/GL2.hw]
                GL4ES3 GLProfile[GL4ES3/GL4.hw]
                GL2ES2 GLProfile[GL2ES2/GL4.hw]
                GL2 GLProfile[GL2/GL2.hw]
                GLES3 GLProfile[GLES3/GLES3.hw]
                GL4 GLProfile[GL4/GL4.hw]
                GL3 GLProfile[GL3/GL4.hw]
                GL2GL3 GLProfile[GL2GL3/GL4.hw]
                default GLProfile[GL2/GL2.hw]
                Count 10 / 12

Swap Interval  1
GL Profile     GLProfile[GL2/GL2.hw]
GL Version     3.0 (Compat profile, arb, compat[ES2], FBO, hardware) - 3.0 Mesa 17.1.0-devel [GL 3.0.0, vendor 17.1.0 (Mesa 17.1.0-devel)]
Quirks         [NoDoubleBufferedPBuffer, NoSetSwapIntervalPostRetarget]
Impl. class    jogamp.opengl.gl4.GL4bcImpl
GL_VENDOR      X.Org
GL_RENDERER    Gallium 0.4 on AMD MULLINS (DRM 2.46.0 / 4.8.0-39-generic, LLVM 4.0.0)
GL_VERSION     3.0 Mesa 17.1.0-devel
GLSL           true, has-compiler-func: true, version: 1.30 / 1.30.0
GL FBO: basic true, full true
GL_EXTENSIONS  241
GLX_EXTENSIONS 30