Re: Give A directFB surface to EGL

On 22 October 2015 at 19:19, 刘涛 <[email protected]> wrote:
> Thank you very much.  My board is only support DirectFB, EGL and GLES2, and
> the route "DirectFB->EGL->GLES2" works good on it, but it is hard to debug
> on my board. So I want to program and debug the route on my PC.  Is it
> noway?
>
> 在 2015-10-22 16:32:58，"Albert Freeman" <[email protected]> 写道：
>>On 22 October 2015 at 15:35, 刘涛 <[email protected]> wrote:
>>> Hi
>>>    I‘m trying to give a directFB surface to eglCreateWindowSurface(),
>>> like
>>> below:
>>>     //1 create Directfb Surface
>>>     DFBDisplayLayerConfig dlc;
>>>     DFBSurfaceDescription dsc;
>>>     DFBWindowDescription dsc_w;
>>>     DirectFBInit(0, NULL);
>>>     DirectFBCreate(&_pDFB);
>>>     _pDFB->SetCooperativeLevel(_pDFB, DFSCL_FULLSCREEN);
>>>     memset(&dsc, 0, sizeof(dsc));
>>>     dsc.flags  = (DFBSurfaceDescriptionFlags)(DSDESC_CAPS);
>>>     dsc.caps   = (DFBSurfaceCapabilities)(DSCAPS_PRIMARY |
>>> DSCAPS_DOUBLE|DSCAPS_GL);
>>>     DFBCHECK(_pDFB->CreateSurface(_pDFB, &dsc, &_pDFB_surface));
>>>
>>>     //2 create egl surface
>>>     EGLDisplay eglDisplay = EGL_NO_DISPLAY;
>>>     EGLint iMajorVersion, iMinorVersion;
>>>      EGLint configAttribs[] =
>>>     {
>>>         EGL_RED_SIZE,          8,
>>>         EGL_GREEN_SIZE,      8,
>>>         EGL_BLUE_SIZE,          8,
>>>         EGL_ALPHA_SIZE,      8,
>>>         EGL_DEPTH_SIZE,      24,
>>>         EGL_STENCIL_SIZE,      8,
>>>         EGL_SAMPLES,          0,
>>>         EGL_SURFACE_TYPE,     EGL_WINDOW_BIT,
>>>         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
>>>         EGL_NONE
>>>     };
>>>     EGLConfig  eglConfig  = 0;
>>>     EGLint iConfigs = 0;
>>>
>>>     eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
>>>     eglInitialize(eglDisplay, &iMajorVersion, &iMinorVersion);
>>>     eglBindAPI(EGL_OPENGL_ES_API);
>>>     eglChooseConfig(eglDisplay, configAttribs, &eglConfig, 1, &iConfigs);
>>>     eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig,
>>> (EGLNativeWindowType)_pDFB_surface, NULL);
>>>
>>>    But it failed and got 0x3003 error code.
>>>     Any idea about that?
>>> Env:
>>>     Ubuntu 14..04.3, Mesa-10.1.3, DirectFB-1.7.6(use system x11)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>>You can't use EGL with DirectFB.
>>DirectFB had a DirectFBGL "extension" for 3D with DirectFB that has
>>apparently died.
>>So you can't get 3D hardware acceleration with DirectFB.
>>DirectFB uses the older fbdev legacy kernel stuff (which the
>>replacement drm at least partially emulates). Although fbdev supports
>>more hardware than the drm. If you are on hardware that doesn't
>>support drm then the best approach I can think of is to software
>>render OpenGL and then somehow obtain the texture rendered to and
>>somehow send that as a 2D image with something that can draw to a
>>fbdev framebuffer (such as DirectFB) (don't ask me how, ask someone
>>else (best to ask on #dri-devel irc channel)). For someone like you it
>>is best to use the latest git (not stable) version of mesa.
>>If your hardware supports drm, your choices for 3D are:
>>1. Use GL (optionally ES) & EGL & drm & gbm with mesa and without
>>DirectFB (see eglkms.c demo in mesa demos and "man -k drm" and maybe
>>http://events.linuxfoundation.org/sites/events/files/slides/brezillon-drm-kms.pdf)
>>(this runs without a window system and works much like DirectFB but I
>>believe you must use OpenGL (optionally ES) for 2D too (although you
>>MIGHT be able to setup a hardware overlay for video)). If you are not
>>using a relatively modern radeon, intel or nvidia card software
>>rendering is probably the best way to go here (using softpipe (or if
>>you are on x86 only: llvmpipe)).
>>2. Use Wayland with EGL and mesa and without DirectFB.
>>3. Use X and without DirectFB with (mesa OR proprietary drivers).
>>
>>How to force softpipe:
>>"export GALLIUM_DRIVER=softpipe" and
>>"export LIBGL_ALWAYS_SOFTWARE=1". You will need to add swrast to the
>>gallium (NOT dri) mesa compile option (e.g.
>>--with-gallium-drivers=swrast) and
>>recompile mesa.
>>
>>You can also force llvmpipe with "export GALLIUM_DRIVER=llvmpipe".
>>Actually "export LIBGL_ALWAYS_SOFTWARE=1" is only required if you have
>>a non gallium mesa driver installed (such as the i965 intel driver).
>>
>>I hope I didn't forget anything.
>
>
>
>
Oh sorry, it does seem DirectFB can be used with EGL (I have never
used DirectFB before and the information I found implied that it would
be tricky to interface with EGL).
What do you mean by debug? Display the framebuffer (drawn on your
embedded board) on your PC?
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