fb_egl.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

   struct dd_function_table functions;
   GLvisual vis;
   int i;

   conf = _eglLookupConfig(drv, dpy, config);
   if (!conf) {
      _eglError(EGL_BAD_CONFIG, "eglCreateContext");
      return EGL_NO_CONTEXT;
   }

   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
      switch (attrib_list[i]) {
         /* no attribs defined for now */
      default:
         _eglError(EGL_BAD_ATTRIBUTE, "eglCreateContext");
         return EGL_NO_CONTEXT;
      }
   }

   c = (fbContext *) calloc(1, sizeof(fbContext));
   if (!c)
      return EGL_NO_CONTEXT;

   _eglInitContext(&c->Base);
   c->Base.Display = disp;
   c->Base.Config = conf;
   c->Base.DrawSurface = EGL_NO_SURFACE;
   c->Base.ReadSurface = EGL_NO_SURFACE;

   /* generate handle and insert into hash table */
   _eglSaveContext(&c->Base);
   assert(c->Base.Handle);

   /* Init default driver functions then plug in our FBdev-specific functions
    */
   _mesa_init_driver_functions(&functions);
   init_core_functions(&functions);

   _eglConfigToContextModesRec(conf, &vis);

   ctx = c->glCtx = _mesa_create_context(&vis, NULL, &functions, (void *)c);
   if (!c->glCtx) {
      _mesa_free(c);
      return GL_FALSE;
   }

   /* Create module contexts */
   _swrast_CreateContext( ctx );
   _vbo_CreateContext( ctx );
   _tnl_CreateContext( ctx );
   _swsetup_CreateContext( ctx );
   _swsetup_Wakeup( ctx );


   /* use default TCL pipeline */
   {
      TNLcontext *tnl = TNL_CONTEXT(ctx);
      tnl->Driver.RunPipeline = _tnl_run_pipeline;
   }

   _mesa_enable_sw_extensions(ctx);

   return c->Base.Handle;
}


static EGLSurface
fbCreateWindowSurface(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, NativeWindowType window, const EGLint *attrib_list)
{
   int i;
   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
      switch (attrib_list[i]) {
         /* no attribs at this time */
      default:
         _eglError(EGL_BAD_ATTRIBUTE, "eglCreateWindowSurface");
         return EGL_NO_SURFACE;
      }
   }
   printf("eglCreateWindowSurface()\n");
   /* XXX unfinished */

   return EGL_NO_SURFACE;
}


static EGLSurface
fbCreatePixmapSurface(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, NativePixmapType pixmap, const EGLint *attrib_list)
{
   _EGLConfig *conf;
   EGLint i;

   conf = _eglLookupConfig(drv, dpy, config);
   if (!conf) {
      _eglError(EGL_BAD_CONFIG, "eglCreatePixmapSurface");
      return EGL_NO_SURFACE;
   }

   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
      switch (attrib_list[i]) {
         /* no attribs at this time */
      default:
         _eglError(EGL_BAD_ATTRIBUTE, "eglCreatePixmapSurface");
         return EGL_NO_SURFACE;
      }
   }

   if (conf->Attrib[EGL_SURFACE_TYPE - FIRST_ATTRIB] == 0) {
      _eglError(EGL_BAD_MATCH, "eglCreatePixmapSurface");
      return EGL_NO_SURFACE;
   }

   printf("eglCreatePixmapSurface()\n");
   return EGL_NO_SURFACE;
}


static EGLSurface
fbCreatePbufferSurface(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, const EGLint *attrib_list)
{
   fbSurface *surf;

   surf = (fbSurface *) calloc(1, sizeof(fbSurface));
   if (!surf) {
      return EGL_NO_SURFACE;
   }

   if (_eglInitPbufferSurface(&surf->Base, drv, dpy, config, attrib_list) == EGL_NO_SURFACE) {
      free(surf);
      return EGL_NO_SURFACE;
   }

   /* create software-based pbuffer */
   {
      GLcontext *ctx = NULL; /* this _should_ be OK */
      GLvisual vis;
      _EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
      assert(conf); /* bad config should be caught earlier */
      _eglConfigToContextModesRec(conf, &vis);

      surf->mesa_framebuffer = _mesa_create_framebuffer(&vis);
      _mesa_add_soft_renderbuffers(surf->mesa_framebuffer,
                                   GL_TRUE, /* color bufs */
                                   vis.haveDepthBuffer,
                                   vis.haveStencilBuffer,
                                   vis.haveAccumBuffer,
                                   GL_FALSE, /* alpha */
                                   GL_FALSE /* aux */ );

      /* set pbuffer/framebuffer size */
      _mesa_resize_framebuffer(ctx, surf->mesa_framebuffer,
                               surf->Base.Width, surf->Base.Height);
   }

   return surf->Base.Handle;
}


static EGLBoolean
fbDestroySurface(_EGLDriver *drv, EGLDisplay dpy, EGLSurface surface)
{
   fbSurface *fs = Lookup_fbSurface(surface);
   _eglRemoveSurface(&fs->Base);
   if (fs->Base.IsBound) {
      fs->Base.DeletePending = EGL_TRUE;
   }
   else {
      free(fs);
   }
   return EGL_TRUE;
}


static EGLBoolean
fbDestroyContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext context)
{
   fbContext *fc = Lookup_fbContext(context);
   _eglRemoveContext(&fc->Base);
   if (fc->Base.IsBound) {
      fc->Base.DeletePending = EGL_TRUE;
   }
   else {
      free(fc);
   }
   return EGL_TRUE;
}


static EGLBoolean
fbMakeCurrent(_EGLDriver *drv, EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext context)
{
   fbSurface *readSurf = Lookup_fbSurface(read);
   fbSurface *drawSurf = Lookup_fbSurface(draw);
   fbContext *ctx = Lookup_fbContext(context);
   EGLBoolean b;

   b = _eglMakeCurrent(drv, dpy, draw, read, context);
   if (!b)
      return EGL_FALSE;

   if (ctx) {
      _mesa_make_current( ctx->glCtx, 
                           drawSurf->mesa_framebuffer,
                           readSurf->mesa_framebuffer);
   } else
      _mesa_make_current( NULL, NULL, NULL );

   return EGL_TRUE;
}


/**
 * Create a drawing surface which can be directly displayed on a screen.
 */
static EGLSurface
fbCreateScreenSurfaceMESA(_EGLDriver *drv, EGLDisplay dpy, EGLConfig cfg,
                          const EGLint *attrib_list)
{
   _EGLConfig *config = _eglLookupConfig(drv, dpy, cfg);
   fbDisplay *display = Lookup_fbDisplay(dpy);
   fbSurface *surface;
   EGLSurface surf;
   GLvisual vis;
   GLcontext *ctx = NULL; /* this should be OK */
   int origin, bytesPerPixel;
   int width, height, stride;
   
   surface = (fbSurface *) malloc(sizeof(*surface));
   if (!surface) {
      return EGL_NO_SURFACE;
   }

   /* init base class, error check, etc. */
   surf = _eglInitScreenSurface(&surface->Base, drv, dpy, cfg, attrib_list);
   if (surf == EGL_NO_SURFACE) {
      free(surface);
      return EGL_NO_SURFACE;
   }

   /* convert EGLConfig to GLvisual */
   _eglConfigToContextModesRec(config, &vis);

   /* create Mesa framebuffer */
   surface->mesa_framebuffer = _mesa_create_framebuffer(&vis);
   if (!surface->mesa_framebuffer) {
      free(surface);
      _eglRemoveSurface(&surface->Base);
      return EGL_NO_SURFACE;
   }

   width = surface->Base.Width;
   height = surface->Base.Height;
   bytesPerPixel = vis.rgbBits / 8;
   stride = width * bytesPerPixel;
   origin = 0;

   /* front color renderbuffer */
   {
      driRenderbuffer *drb = driNewRenderbuffer(GL_RGBA, display->pFB,
                                                bytesPerPixel,
                                                origin, stride, NULL);
      fbSetSpanFunctions(drb, &vis);
      _mesa_add_renderbuffer(surface->mesa_framebuffer,
                             BUFFER_FRONT_LEFT, &drb->Base);
   }

   /* back color renderbuffer */
   if (vis.doubleBufferMode) {
      GLubyte *backBuf = _mesa_malloc(stride * height);
      driRenderbuffer *drb = driNewRenderbuffer(GL_RGBA, backBuf,
                                                bytesPerPixel,
                                                origin, stride, NULL);
      fbSetSpanFunctions(drb, &vis);
      _mesa_add_renderbuffer(surface->mesa_framebuffer,
                             BUFFER_BACK_LEFT, &drb->Base);
   }

   /* other renderbuffers- software based */
   _mesa_add_soft_renderbuffers(surface->mesa_framebuffer,
                                GL_FALSE, /* color */
                                vis.haveDepthBuffer,
                                vis.haveStencilBuffer,
                                vis.haveAccumBuffer,
                                GL_FALSE, /* alpha */
                                GL_FALSE /* aux */);
   
   _mesa_resize_framebuffer(ctx, surface->mesa_framebuffer, width, height);

   return surf;
}


/**
 * Show the given surface on the named screen.
 * If surface is EGL_NO_SURFACE, disable the screen's output.
 */
static EGLBoolean
fbShowSurfaceMESA(_EGLDriver *drv, EGLDisplay dpy, EGLScreenMESA screen,
                    EGLSurface surface, EGLModeMESA m)
{
   fbDisplay *display = Lookup_fbDisplay(dpy);
   fbScreen *scrn = Lookup_fbScreen(dpy, screen);
   fbSurface *surf = Lookup_fbSurface(surface);
   FILE *file;
   char buffer[NAME_MAX];
   _EGLMode *mode = _eglLookupMode(dpy, m);
   int bits;
   
   if (!_eglShowSurfaceMESA(drv, dpy, screen, surface, m))
      return EGL_FALSE;
      
   snprintf(buffer, sizeof(buffer), "%s/%s/blank", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file) {
err:
      printf("chown all fb sysfs attrib to allow write - %s\n", buffer);
      return EGL_FALSE;
   }
   snprintf(buffer, sizeof(buffer), "%d", (m == EGL_NO_MODE_MESA ? VESA_POWERDOWN : VESA_VSYNC_SUSPEND));
   fputs(buffer, file);
   fclose(file);
   
   if (m == EGL_NO_MODE_MESA)
      return EGL_TRUE;
   
   snprintf(buffer, sizeof(buffer), "%s/%s/mode", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file)
      goto err;
   fputs(mode->Name, file);
   fclose(file);
   
   snprintf(buffer, sizeof(buffer), "%s/%s/bits_per_pixel", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file)
      goto err;
   bits = GET_CONFIG_ATTRIB(surf->Base.Config, EGL_BUFFER_SIZE);
   snprintf(buffer, sizeof(buffer), "%d", bits);
   fputs(buffer, file);
   fclose(file);

   fbSetupFramebuffer(display, scrn->fb);
   
   snprintf(buffer, sizeof(buffer), "%s/%s/blank", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file)
      goto err;
      
   snprintf(buffer, sizeof(buffer), "%d", VESA_NO_BLANKING);
   fputs(buffer, file);
   fclose(file);
   
   return EGL_TRUE;
}


/* If the backbuffer is on a videocard, this is extraordinarily slow!
 */
static EGLBoolean
fbSwapBuffers(_EGLDriver *drv, EGLDisplay dpy, EGLSurface draw)
{
   fbContext *context = (fbContext *)_eglGetCurrentContext();
   fbSurface *fs =  Lookup_fbSurface(draw);
   struct gl_renderbuffer * front_renderbuffer = fs->mesa_framebuffer->Attachment[BUFFER_FRONT_LEFT].Renderbuffer;
   void *frontBuffer = front_renderbuffer->Data;
   int currentPitch = ((driRenderbuffer *)front_renderbuffer)->pitch;
   void *backBuffer = fs->mesa_framebuffer->Attachment[BUFFER_BACK_LEFT].Renderbuffer->Data;

   if (!_eglSwapBuffers(drv, dpy, draw))
      return EGL_FALSE;

   if (context) {
      GLcontext *ctx = context->glCtx;
      
      if (ctx->Visual.doubleBufferMode) {
	 int i;
	 int offset = 0;
         char *tmp = _mesa_malloc(currentPitch);

         _mesa_notifySwapBuffers( ctx );  /* flush pending rendering comands */

         ASSERT(frontBuffer);
         ASSERT(backBuffer);

	 for (i = 0; i < fs->Base.Height; i++) {
            _mesa_memcpy(tmp, (char *) backBuffer + offset,
                         currentPitch);
            _mesa_memcpy((char *) frontBuffer + offset, tmp,
                          currentPitch);
            offset += currentPitch;
	 }
	    
	 _mesa_free(tmp);
      }
   }
   else {
      /* XXX this shouldn't be an error but we can't handle it for now */
      _mesa_problem(NULL, "fbSwapBuffers: drawable has no context!\n");
      return EGL_FALSE;
   }
   return EGL_TRUE;
}


/**
 * The bootstrap function.  Return a new fbDriver object and
 * plug in API functions.
 */
_EGLDriver *
_eglMain(_EGLDisplay *dpy)
{
   fbDriver *fb;

   fb = (fbDriver *) calloc(1, sizeof(fbDriver));
   if (!fb) {
      return NULL;
   }

   /* First fill in the dispatch table with defaults */
   _eglInitDriverFallbacks(&fb->Base);
   
   /* then plug in our fb-specific functions */
   fb->Base.Initialize = fbInitialize;
   fb->Base.Terminate = fbTerminate;
   fb->Base.CreateContext = fbCreateContext;
   fb->Base.MakeCurrent = fbMakeCurrent;
   fb->Base.CreateWindowSurface = fbCreateWindowSurface;
   fb->Base.CreatePixmapSurface = fbCreatePixmapSurface;
   fb->Base.CreatePbufferSurface = fbCreatePbufferSurface;
   fb->Base.DestroySurface = fbDestroySurface;
   fb->Base.DestroyContext = fbDestroyContext;
   fb->Base.CreateScreenSurfaceMESA = fbCreateScreenSurfaceMESA;
   fb->Base.ShowSurfaceMESA = fbShowSurfaceMESA;
   fb->Base.SwapBuffers = fbSwapBuffers;
   
   /* enable supported extensions */
   fb->Base.MESA_screen_surface = EGL_TRUE;
   fb->Base.MESA_copy_context = EGL_TRUE;

   return &fb->Base;
}