Re: Give A directFB surface to EGL

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.

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