Since your using an EGL window surface, you will need to make the back buffer visible by calling eglSwapBuffers. A systems driver would do this in the DisplayLayerFuncs::FlipRegion function. Single buffered display layers do it in the UpdateRegion function, however I do not believe EGL supports single buffered EGL window surfaces.
Timothy -- Timothy Strelchun CE Software Engineering Digital Home Group Intel Corporation The views expressed above are my own and not those of Intel >-----Original Message----- >From: directfb-dev-boun...@directfb.org >[mailto:directfb-dev-boun...@directfb.org] On Behalf Of Favor Tang >Sent: Tuesday, July 28, 2009 8:45 PM >To: directfb-us...@directfb.org; directfb-dev@directfb.org >Cc: Hui Tang >Subject: [directfb-dev] problem with writing directfb >gfxdriver for openGL ES > >hi, > > I initialize OpenGL ES in driver_init_device like below, >and I implement all the other draw functions. all the draw >functions are written with openGL ES API functions, just >emulate implementations of gl driver. > > the test result: I did see the draw functions being called >(not software, it is my own functions), but It can't render >anything to the screen. what's wrong with my own >implementation gfx driver? Please give me some kindly help as >possible as you can, I'd be very appreciated that. > > if you want more infomation about this problem, please let me know. >thank you for you kindly help. > >static DFBResult >driver_init_device( CoreGraphicsDevice *device, > GraphicsDeviceInfo *device_info, > void *driver_data, > void *device_data ) >{ > > // EGL variables > EGLDisplay eglDisplay = 0; > EGLConfig eglConfig = 0; > EGLSurface eglSurface = 0; > EGLContext eglContext = 0; > > EGLint pi32ConfigAttribs[3]; > pi32ConfigAttribs[0] = EGL_SURFACE_TYPE; > pi32ConfigAttribs[1] = EGL_WINDOW_BIT; > pi32ConfigAttribs[2] = EGL_NONE; > > > eglDisplay = eglGetDisplay((NativeDisplayType)0); > printf("eglDisplay return value = %d \n", eglDisplay ); > > EGLint iMajorVersion, iMinorVersion; > if (!eglInitialize(eglDisplay, &iMajorVersion, &iMinorVersion)) > { > printf("Error: eglInitialize() failed.\n"); > return 0; > } > else > { > printf("eglInitialize() OpenGLES %d.%d \n", >iMajorVersion, iMinorVersion ); > } > > int iConfigs; > if (!eglChooseConfig(eglDisplay, pi32ConfigAttribs, >&eglConfig, 1, >&iConfigs) || (iConfigs != 1)) > { > printf("Error: eglChooseConfig() failed.\n"); > return 0; > } > > eglSurface = eglCreateWindowSurface(eglDisplay, >eglConfig, (NativeWindowType)0, NULL); > if (!TestEGLError("eglCreateWindowSurface")) > { > return 0; > } > > > eglContext = eglCreateContext(eglDisplay, eglConfig, >NULL, NULL); > if (!TestEGLError("eglCreateContext")) > { > return 0; > } > > eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext); > if (!TestEGLError("eglMakeCurrent")) > { > return 0; > } > > const char* renderer = (const char*) glGetString (GL_RENDERER); > direct_snputs( device_info->name, > renderer ?: "Unknown", >DFB_GRAPHICS_DEVICE_INFO_NAME_LENGTH ); > direct_snputs( device_info->vendor, > "OpenGLES Acceleration -", >DFB_GRAPHICS_DEVICE_INFO_VENDOR_LENGTH ); > > > /* device limitations */ > device_info->limits.surface_byteoffset_alignment = 8; > device_info->limits.surface_bytepitch_alignment = 8; > > device_info->caps.flags = CCF_CLIPPING | CCF_RENDEROPTS; > device_info->caps.accel = GL_SUPPORTED_DRAWINGFUNCTIONS | > GL_SUPPORTED_BLITTINGFUNCTIONS; > device_info->caps.drawing = GL_SUPPORTED_DRAWINGFLAGS; > device_info->caps.blitting = GL_SUPPORTED_BLITTINGFLAGS; > > return DFB_OK; >} > > Best Regards > >thanks _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
