[SOLVED]OpenGL: Could not find FB config over VNC + mesa
lazarus / 70-OpenGL

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marius.maximus · 2015-03-12 13:47

My sample code:

Code: [Select] //(on button click)
  OpenGLControl1:=TOpenGLControl.Create(Self);
  with OpenGLControl1 do begin
    Name:='OpenGLControl1';
    Parent:=Self; //<exception HERE on VNC
    Align:=alClient;
    OnPaint:=@OpenGLControl1Paint;
    OnResize:=@OpenGLControl1Resize;
    AutoResizeViewport:=true;
  end;

  Application.AddOnIdleHandler(@OnAppIdle);
All works OK when I run application local , but I have problem when
try run application over VNC
I have exception in
GLGtkGlxContext.pas->gtk_gl_area_share_new_usefpglx
"gdk_gl_context_share_new_usefpglx no visual found"

My next step is use mesa , I look into blender application (
blender.org ) this app works in "hardware opengl" and second metod is
"software opengl"
"software opengl"  is very easy metod: add mesa lib to LD_LIBRARY_PATH
, this metod  works in blender very well

I try use similar metod in my application , I use this same libGL.so
and have different exception:
in GLGtkGlxContext.pas->gtk_gl_area_share_new_usefpglx 'Could not find
FB config'

Is possible use "software opengl" with TOpenGLControl ?

M

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marius.maximus · 2015-03-15 19:45

step 1 ) Build mesa :
Code: [Select]./configure --enable-xlib-glx --disable-dri \
  --enable-glx \
  --with-gallium-drivers=""

step 2)
Change RedBits, GreenBits, BlueBits in TOpenGLControl control to 1

in real graphic card glxinfo return GLX version: 1.4
in VNC glxinfo return GLX version: 1.2
I must build custom mesa and replace default debian libs

Second problem is "GLX Visuals"
real graphic card support 888 RGB
but mesa on VNC support only 655 RGB

TOpenGLControl default values RedBits, GreenBits, BlueBits is 888
and it is my problem