boolean
stw_init(const struct stw_winsys *stw_winsys)
{
   static struct stw_device stw_dev_storage;
   struct pipe_screen *screen;

   debug_printf("%s\n", __FUNCTION__);
   
   assert(!stw_dev);

   stw_tls_init();

   stw_dev = &stw_dev_storage;
   memset(stw_dev, 0, sizeof(*stw_dev));

#ifdef DEBUG
   stw_dev->memdbg_no = debug_memory_begin();
#endif
   
   stw_dev->stw_winsys = stw_winsys;

#ifdef WIN32_THREADS
   _glthread_INIT_MUTEX(OneTimeLock);
#endif

   screen = stw_winsys->create_screen();
   if(!screen)
      goto error1;

#ifdef DEBUG
   stw_dev->screen = trace_screen_create(screen);
   stw_dev->trace_running = stw_dev->screen != screen ? TRUE : FALSE;
#else
   stw_dev->screen = screen;
#endif
   
   stw_dev->screen->flush_frontbuffer = &stw_flush_frontbuffer;
   
   pipe_mutex_init( stw_dev->ctx_mutex );
   pipe_mutex_init( stw_dev->fb_mutex );

   stw_dev->ctx_table = handle_table_create();
   if (!stw_dev->ctx_table) {
      goto error1;
   }

   stw_pixelformat_init();

   return TRUE;

error1:
   stw_dev = NULL;
   return FALSE;
}

struct radeon_winsys *radeon_drm_winsys_create(int fd)
{
    struct radeon_drm_winsys *ws = CALLOC_STRUCT(radeon_drm_winsys);
    if (!ws) {
        return NULL;
    }

    ws->fd = fd;

    if (!do_winsys_init(ws))
        goto fail;

    /* Create managers. */
    ws->kman = radeon_bomgr_create(ws);
    if (!ws->kman)
        goto fail;
    ws->cman = pb_cache_manager_create(ws->kman, 1000000);
    if (!ws->cman)
        goto fail;

    if (ws->gen >= R600) {
        ws->surf_man = radeon_surface_manager_new(fd);
        if (!ws->surf_man)
            goto fail;
    }

    /* Set functions. */
    ws->base.destroy = radeon_winsys_destroy;
    ws->base.query_info = radeon_query_info;
    ws->base.cs_request_feature = radeon_cs_request_feature;
    ws->base.surface_init = radeon_drm_winsys_surface_init;
    ws->base.surface_best = radeon_drm_winsys_surface_best;
    ws->base.query_timestamp = radeon_query_timestamp;

    radeon_bomgr_init_functions(ws);
    radeon_drm_cs_init_functions(ws);

    pipe_mutex_init(ws->hyperz_owner_mutex);
    pipe_mutex_init(ws->cmask_owner_mutex);

    return &ws->base;

fail:
    if (ws->cman)
        ws->cman->destroy(ws->cman);
    if (ws->kman)
        ws->kman->destroy(ws->kman);
    if (ws->surf_man)
        radeon_surface_manager_free(ws->surf_man);
    FREE(ws);
    return NULL;
}

/**
 * Create a caching buffer manager
 *
 * @param provider The buffer manager to which cache miss buffer requests
 * should be redirected.
 * @param usecs Unused buffers may be released from the cache after this
 * time
 * @param size_factor Declare buffers that are size_factor times bigger than
 * the requested size as cache hits.
 * @param bypass_usage Bitmask. If (requested usage & bypass_usage) != 0,
 * buffer allocation requests are redirected to the provider.
 * @param maximum_cache_size  Maximum size of all unused buffers the cache can
 * hold.
 */
struct pb_manager *
pb_cache_manager_create(struct pb_manager *provider, 
                        unsigned usecs,
                        float size_factor,
                        unsigned bypass_usage,
                        uint64_t maximum_cache_size)
{
   struct pb_cache_manager *mgr;

   if(!provider)
      return NULL;
   
   mgr = CALLOC_STRUCT(pb_cache_manager);
   if (!mgr)
      return NULL;

   mgr->base.destroy = pb_cache_manager_destroy;
   mgr->base.create_buffer = pb_cache_manager_create_buffer;
   mgr->base.flush = pb_cache_manager_flush;
   mgr->provider = provider;
   mgr->usecs = usecs;
   mgr->size_factor = size_factor;
   mgr->bypass_usage = bypass_usage;
   LIST_INITHEAD(&mgr->delayed);
   mgr->numDelayed = 0;
   mgr->max_cache_size = maximum_cache_size;
   pipe_mutex_init(mgr->mutex);
      
   return &mgr->base;
}

struct pb_manager *
fenced_bufmgr_create(struct pb_manager *provider,
                     struct pb_fence_ops *ops,
                     pb_size max_buffer_size,
                     pb_size max_cpu_total_size)
{
   struct fenced_manager *fenced_mgr;

   if(!provider)
      return NULL;

   fenced_mgr = CALLOC_STRUCT(fenced_manager);
   if (!fenced_mgr)
      return NULL;

   fenced_mgr->base.destroy = fenced_bufmgr_destroy;
   fenced_mgr->base.create_buffer = fenced_bufmgr_create_buffer;
   fenced_mgr->base.flush = fenced_bufmgr_flush;

   fenced_mgr->provider = provider;
   fenced_mgr->ops = ops;
   fenced_mgr->max_buffer_size = max_buffer_size;
   fenced_mgr->max_cpu_total_size = max_cpu_total_size;

   LIST_INITHEAD(&fenced_mgr->fenced);
   fenced_mgr->num_fenced = 0;

   LIST_INITHEAD(&fenced_mgr->unfenced);
   fenced_mgr->num_unfenced = 0;

   pipe_mutex_init(fenced_mgr->mutex);

   return &fenced_mgr->base;
}

const char*
debug_symbol_name_cached(const void *addr)
{
   const char* name;
#ifdef PIPE_SUBSYSTEM_WINDOWS_USER
   static boolean first = TRUE;

   if (first) {
      pipe_mutex_init(symbols_mutex);
      first = FALSE;
   }
#endif

   pipe_mutex_lock(symbols_mutex);
   if(!symbols_hash)
      symbols_hash = util_hash_table_create(hash_ptr, compare_ptr);
   name = util_hash_table_get(symbols_hash, (void*)addr);
   if(!name)
   {
      char buf[1024];
      debug_symbol_name(addr, buf, sizeof(buf));
      name = strdup(buf);

      util_hash_table_set(symbols_hash, (void*)addr, (void*)name);
   }
   pipe_mutex_unlock(symbols_mutex);
   return name;
}

/**
 * Create a new primitive setup/render stage.
 */
struct setup_context *setup_create_context( struct softpipe_context *softpipe )
{
   struct setup_context *setup = CALLOC_STRUCT(setup_context);
#if SP_NUM_QUAD_THREADS > 1
   uint i;
#endif

   setup->softpipe = softpipe;

   setup->quad.coef = setup->coef;
   setup->quad.posCoef = &setup->posCoef;

#if SP_NUM_QUAD_THREADS > 1
   setup->que.first = 0;
   setup->que.last = 0;
   pipe_mutex_init( setup->que.que_mutex );
   pipe_condvar_init( setup->que.que_notfull_condvar );
   pipe_condvar_init( setup->que.que_notempty_condvar );
   setup->que.jobs_added = 0;
   setup->que.jobs_done = 0;
   pipe_condvar_init( setup->que.que_done_condvar );
   for (i = 0; i < SP_NUM_QUAD_THREADS; i++) {
      setup->threads[i].setup = setup;
      setup->threads[i].id = i;
      setup->threads[i].handle = pipe_thread_create( quad_thread, &setup->threads[i] );
   }
#endif

   return setup;
}

struct pb_manager *
pb_debug_manager_create(struct pb_manager *provider, 
                        pb_size underflow_size, pb_size overflow_size) 
{
   struct pb_debug_manager *mgr;

   if(!provider)
      return NULL;
   
   mgr = CALLOC_STRUCT(pb_debug_manager);
   if (!mgr)
      return NULL;

   mgr->base.destroy = pb_debug_manager_destroy;
   mgr->base.create_buffer = pb_debug_manager_create_buffer;
   mgr->base.flush = pb_debug_manager_flush;
   mgr->provider = provider;
   mgr->underflow_size = underflow_size;
   mgr->overflow_size = overflow_size;
    
   pipe_mutex_init(mgr->mutex);
   LIST_INITHEAD(&mgr->list);

   return &mgr->base;
}

/**
 * Create a new scene object.
 * \param queue  the queue to put newly rendered/emptied scenes into
 */
struct lp_scene *
lp_scene_create( struct pipe_context *pipe )
{
   struct lp_scene *scene = CALLOC_STRUCT(lp_scene);
   if (!scene)
      return NULL;

   scene->pipe = pipe;

   scene->data.head =
      CALLOC_STRUCT(data_block);

   pipe_mutex_init(scene->mutex);

#ifdef DEBUG
   /* Do some scene limit sanity checks here */
   {
      size_t maxBins = TILES_X * TILES_Y;
      size_t maxCommandBytes = sizeof(struct cmd_block) * maxBins;
      size_t maxCommandPlusData = maxCommandBytes + DATA_BLOCK_SIZE;
      /* We'll need at least one command block per bin.  Make sure that's
       * less than the max allowed scene size.
       */
      assert(maxCommandBytes < LP_SCENE_MAX_SIZE);
      /* We'll also need space for at least one other data block */
      assert(maxCommandPlusData <= LP_SCENE_MAX_SIZE);
   }
#endif

   return scene;
}

struct pipe_screen *
rbug_screen_create(struct pipe_screen *screen)
{
   struct rbug_screen *rb_screen;

   if (!debug_get_option_rbug())
      return screen;

   rb_screen = CALLOC_STRUCT(rbug_screen);
   if (!rb_screen)
      return screen;

   pipe_mutex_init(rb_screen->list_mutex);
   make_empty_list(&rb_screen->contexts);
   make_empty_list(&rb_screen->resources);
   make_empty_list(&rb_screen->surfaces);
   make_empty_list(&rb_screen->transfers);

   rb_screen->base.winsys = NULL;

   rb_screen->base.destroy = rbug_screen_destroy;
   rb_screen->base.get_name = rbug_screen_get_name;
   rb_screen->base.get_vendor = rbug_screen_get_vendor;
   rb_screen->base.get_param = rbug_screen_get_param;
   rb_screen->base.get_shader_param = rbug_screen_get_shader_param;
   rb_screen->base.get_paramf = rbug_screen_get_paramf;
   rb_screen->base.is_format_supported = rbug_screen_is_format_supported;
   rb_screen->base.context_create = rbug_screen_context_create;
   rb_screen->base.resource_create = rbug_screen_resource_create;
   rb_screen->base.resource_from_handle = rbug_screen_resource_from_handle;
   rb_screen->base.resource_get_handle = rbug_screen_resource_get_handle;
   rb_screen->base.resource_destroy = rbug_screen_resource_destroy;
   rb_screen->base.user_buffer_create = rbug_screen_user_buffer_create;
   rb_screen->base.flush_frontbuffer = rbug_screen_flush_frontbuffer;
   rb_screen->base.fence_reference = rbug_screen_fence_reference;
   rb_screen->base.fence_signalled = rbug_screen_fence_signalled;
   rb_screen->base.fence_finish = rbug_screen_fence_finish;

   rb_screen->screen = screen;

   rb_screen->private_context = screen->context_create(screen, NULL);
   if (!rb_screen->private_context)
      goto err_free;

   rb_screen->rbug = rbug_start(rb_screen);

   if (!rb_screen->rbug)
      goto err_context;

   return &rb_screen->base;

err_context:
   rb_screen->private_context->destroy(rb_screen->private_context);
err_free:
   FREE(rb_screen);
   return screen;
}

static XMesaDisplay
xmesa_init_display( Display *display )
{
   pipe_static_mutex(init_mutex);
   XMesaDisplay xmdpy;
   int i;

   pipe_mutex_lock(init_mutex);

   /* Look for XMesaDisplay which corresponds to 'display' */
   for (i = 0; i < NumDisplays; i++) {
      if (Displays[i].display == display) {
         /* Found it */
         pipe_mutex_unlock(init_mutex);
         return &Displays[i];
      }
   }

   /* Create new XMesaDisplay */

   assert(NumDisplays < MAX_DISPLAYS);
   xmdpy = &Displays[NumDisplays];
   NumDisplays++;

   if (!xmdpy->display && display) {
      xmdpy->display = display;
      xmdpy->screen = driver.create_pipe_screen(display);
      xmdpy->smapi = CALLOC_STRUCT(st_manager);
      if (xmdpy->smapi) {
         xmdpy->smapi->screen = xmdpy->screen;
         xmdpy->smapi->get_param = xmesa_get_param;
      }

      if (xmdpy->screen && xmdpy->smapi) {
         pipe_mutex_init(xmdpy->mutex);
      }
      else {
         if (xmdpy->screen) {
            xmdpy->screen->destroy(xmdpy->screen);
            xmdpy->screen = NULL;
         }
         if (xmdpy->smapi) {
            FREE(xmdpy->smapi);
            xmdpy->smapi = NULL;
         }

         xmdpy->display = NULL;
      }
   }
   if (!xmdpy->display || xmdpy->display != display)
      xmdpy = NULL;

   pipe_mutex_unlock(init_mutex);

   return xmdpy;
}

void
util_queue_init(struct util_queue *queue,
                void (*execute_job)(void *))
{
   memset(queue, 0, sizeof(*queue));
   queue->execute_job = execute_job;
   pipe_mutex_init(queue->lock);
   pipe_semaphore_init(&queue->has_space, ARRAY_SIZE(queue->jobs));
   pipe_semaphore_init(&queue->queued, 0);
   queue->thread = pipe_thread_create(util_queue_thread_func, queue);
}

static struct virgl_winsys *
virgl_drm_winsys_create(int drmFD)
{
   struct virgl_drm_winsys *qdws;

   qdws = CALLOC_STRUCT(virgl_drm_winsys);
   if (!qdws)
      return NULL;

   qdws->fd = drmFD;
   qdws->num_delayed = 0;
   qdws->usecs = 1000000;
   LIST_INITHEAD(&qdws->delayed);
   pipe_mutex_init(qdws->mutex);
   pipe_mutex_init(qdws->bo_handles_mutex);
   qdws->bo_handles = util_hash_table_create(handle_hash, handle_compare);
   qdws->bo_names = util_hash_table_create(handle_hash, handle_compare);
   qdws->base.destroy = virgl_drm_winsys_destroy;

   qdws->base.transfer_put = virgl_bo_transfer_put;
   qdws->base.transfer_get = virgl_bo_transfer_get;
   qdws->base.resource_create = virgl_drm_winsys_resource_cache_create;
   qdws->base.resource_unref = virgl_drm_winsys_resource_unref;
   qdws->base.resource_create_from_handle = virgl_drm_winsys_resource_create_handle;
   qdws->base.resource_get_handle = virgl_drm_winsys_resource_get_handle;
   qdws->base.resource_map = virgl_drm_resource_map;
   qdws->base.resource_wait = virgl_drm_resource_wait;
   qdws->base.cmd_buf_create = virgl_drm_cmd_buf_create;
   qdws->base.cmd_buf_destroy = virgl_drm_cmd_buf_destroy;
   qdws->base.submit_cmd = virgl_drm_winsys_submit_cmd;
   qdws->base.emit_res = virgl_drm_emit_res;
   qdws->base.res_is_referenced = virgl_drm_res_is_ref;

   qdws->base.cs_create_fence = virgl_cs_create_fence;
   qdws->base.fence_wait = virgl_fence_wait;
   qdws->base.fence_reference = virgl_fence_reference;

   qdws->base.get_caps = virgl_drm_get_caps;
   return &qdws->base;

}

struct pipe_screen* r300_screen_create(struct radeon_winsys *rws)
{
    struct r300_screen *r300screen = CALLOC_STRUCT(r300_screen);

    if (!r300screen) {
        FREE(r300screen);
        return NULL;
    }

    rws->query_info(rws, &r300screen->info);

    r300_init_debug(r300screen);
    r300_parse_chipset(r300screen->info.pci_id, &r300screen->caps);

    if (SCREEN_DBG_ON(r300screen, DBG_NO_ZMASK))
        r300screen->caps.zmask_ram = 0;
    if (SCREEN_DBG_ON(r300screen, DBG_NO_HIZ))
        r300screen->caps.hiz_ram = 0;

    if (r300screen->info.drm_minor < 8)
        r300screen->caps.has_us_format = FALSE;

    pipe_mutex_init(r300screen->num_contexts_mutex);

    util_slab_create(&r300screen->pool_buffers,
                     sizeof(struct r300_resource), 64,
                     UTIL_SLAB_SINGLETHREADED);

    r300screen->rws = rws;
    r300screen->screen.winsys = (struct pipe_winsys*)rws;
    r300screen->screen.destroy = r300_destroy_screen;
    r300screen->screen.get_name = r300_get_name;
    r300screen->screen.get_vendor = r300_get_vendor;
    r300screen->screen.get_param = r300_get_param;
    r300screen->screen.get_shader_param = r300_get_shader_param;
    r300screen->screen.get_paramf = r300_get_paramf;
    r300screen->screen.get_video_param = r300_get_video_param;
    r300screen->screen.is_format_supported = r300_is_format_supported;
    r300screen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
    r300screen->screen.context_create = r300_create_context;
    r300screen->screen.fence_reference = r300_fence_reference;
    r300screen->screen.fence_signalled = r300_fence_signalled;
    r300screen->screen.fence_finish = r300_fence_finish;

    r300_init_screen_resource_functions(r300screen);

    util_format_s3tc_init();

    return &r300screen->screen;
}

GalliumContext::GalliumContext(ulong options)
	:
	fOptions(options),
	fScreen(NULL),
	fCurrentContext(0)
{
	CALLED();

	// Make all contexts a known value
	for (context_id i = 0; i < CONTEXT_MAX; i++)
		fContext[i] = NULL;

	CreateScreen();

	pipe_mutex_init(fMutex);
}

/**
 * Create a new scene object.
 * \param queue  the queue to put newly rendered/emptied scenes into
 */
struct lp_scene *
lp_scene_create( struct pipe_context *pipe )
{
   struct lp_scene *scene = CALLOC_STRUCT(lp_scene);
   if (!scene)
      return NULL;

   scene->pipe = pipe;

   scene->data.head =
      CALLOC_STRUCT(data_block);

   pipe_mutex_init(scene->mutex);

   return scene;
}

struct pipe_screen *radeonsi_screen_create(struct radeon_winsys *ws)
{
	struct si_screen *sscreen = CALLOC_STRUCT(si_screen);

	if (!sscreen) {
		return NULL;
	}

	/* Set functions first. */
	sscreen->b.b.context_create = si_create_context;
	sscreen->b.b.destroy = si_destroy_screen;
	sscreen->b.b.get_param = si_get_param;
	sscreen->b.b.get_shader_param = si_get_shader_param;
	sscreen->b.b.is_format_supported = si_is_format_supported;
	sscreen->b.b.resource_create = r600_resource_create_common;

	si_init_screen_state_functions(sscreen);

	if (!r600_common_screen_init(&sscreen->b, ws) ||
	    !si_init_gs_info(sscreen) ||
	    !si_init_shader_cache(sscreen)) {
		FREE(sscreen);
		return NULL;
	}

	if (!debug_get_bool_option("RADEON_DISABLE_PERFCOUNTERS", FALSE))
		si_init_perfcounters(sscreen);

	sscreen->b.has_cp_dma = true;
	sscreen->b.has_streamout = true;
	pipe_mutex_init(sscreen->shader_parts_mutex);
	sscreen->use_monolithic_shaders =
		HAVE_LLVM < 0x0308 ||
		(sscreen->b.debug_flags & DBG_MONOLITHIC_SHADERS) != 0;

	if (debug_get_bool_option("RADEON_DUMP_SHADERS", FALSE))
		sscreen->b.debug_flags |= DBG_FS | DBG_VS | DBG_GS | DBG_PS | DBG_CS;

	/* Create the auxiliary context. This must be done last. */
	sscreen->b.aux_context = sscreen->b.b.context_create(&sscreen->b.b, NULL, 0);

	if (sscreen->b.debug_flags & DBG_TEST_DMA)
		r600_test_dma(&sscreen->b);

	return &sscreen->b.b;
}

/**
 * Initialize a caching buffer manager.
 *
 * @param mgr     The cache buffer manager
 * @param usecs   Unused buffers may be released from the cache after this
 *                time
 * @param size_factor  Declare buffers that are size_factor times bigger than
 *                     the requested size as cache hits.
 * @param bypass_usage  Bitmask. If (requested usage & bypass_usage) != 0,
 *                      buffer allocation requests are rejected.
 * @param maximum_cache_size  Maximum size of all unused buffers the cache can
 *                            hold.
 * @param destroy_buffer  Function that destroys a buffer for good.
 * @param can_reclaim     Whether a buffer can be reclaimed (e.g. is not busy)
 */
void
pb_cache_init(struct pb_cache *mgr, uint usecs, float size_factor,
              unsigned bypass_usage, uint64_t maximum_cache_size,
              void (*destroy_buffer)(struct pb_buffer *buf),
              bool (*can_reclaim)(struct pb_buffer *buf))
{
   LIST_INITHEAD(&mgr->cache);
   pipe_mutex_init(mgr->mutex);
   mgr->cache_size = 0;
   mgr->max_cache_size = maximum_cache_size;
   mgr->usecs = usecs;
   mgr->num_buffers = 0;
   mgr->bypass_usage = bypass_usage;
   mgr->size_factor = size_factor;
   mgr->destroy_buffer = destroy_buffer;
   mgr->can_reclaim = can_reclaim;
}

struct pb_manager *
mm_bufmgr_create_from_buffer(struct pb_buffer *buffer, 
                             pb_size size, pb_size align2) 
{
   struct mm_pb_manager *mm;

   if(!buffer)
      return NULL;
   
   mm = CALLOC_STRUCT(mm_pb_manager);
   if (!mm)
      return NULL;

   mm->base.destroy = mm_bufmgr_destroy;
   mm->base.create_buffer = mm_bufmgr_create_buffer;
   mm->base.flush = mm_bufmgr_flush;

   mm->size = size;
   mm->align2 = align2; /* 64-byte alignment */

   pipe_mutex_init(mm->mutex);

   mm->buffer = buffer; 

   mm->map = pb_map(mm->buffer, 
		    PIPE_BUFFER_USAGE_CPU_READ |
		    PIPE_BUFFER_USAGE_CPU_WRITE);
   if(!mm->map)
      goto failure;

   mm->heap = u_mmInit(0, (int)size); 
   if (!mm->heap)
      goto failure;

   return SUPER(mm);
   
failure:
if(mm->heap)
   u_mmDestroy(mm->heap);
   if(mm->map)
      pb_unmap(mm->buffer);
   if(mm)
      FREE(mm);
   return NULL;
}

struct pb_manager *radeon_bomgr_create(struct radeon_drm_winsys *rws)
{
    struct radeon_bomgr *mgr;

    mgr = CALLOC_STRUCT(radeon_bomgr);
    if (!mgr)
	return NULL;

    mgr->base.destroy = radeon_bomgr_destroy;
    mgr->base.create_buffer = radeon_bomgr_create_bo;
    mgr->base.flush = radeon_bomgr_flush;
    mgr->base.is_buffer_busy = radeon_bomgr_is_buffer_busy;

    mgr->rws = rws;
    mgr->bo_handles = util_hash_table_create(handle_hash, handle_compare);
    pipe_mutex_init(mgr->bo_handles_mutex);
    return &mgr->base;
}

struct pipe_screen* r300_screen_create(struct radeon_winsys *rws)
{
    struct r300_screen *r300screen = CALLOC_STRUCT(r300_screen);

    if (!r300screen) {
        FREE(r300screen);
        return NULL;
    }

    rws->query_info(rws, &r300screen->info);

    r300_init_debug(r300screen);
    r300_parse_chipset(r300screen->info.pci_id, &r300screen->caps);

    if (SCREEN_DBG_ON(r300screen, DBG_NO_ZMASK))
        r300screen->caps.zmask_ram = 0;
    if (SCREEN_DBG_ON(r300screen, DBG_NO_HIZ))
        r300screen->caps.hiz_ram = 0;

    r300screen->rws = rws;
    r300screen->screen.destroy = r300_destroy_screen;
    r300screen->screen.get_name = r300_get_name;
    r300screen->screen.get_vendor = r300_get_vendor;
    r300screen->screen.get_device_vendor = r300_get_device_vendor;
    r300screen->screen.get_param = r300_get_param;
    r300screen->screen.get_shader_param = r300_get_shader_param;
    r300screen->screen.get_paramf = r300_get_paramf;
    r300screen->screen.get_video_param = r300_get_video_param;
    r300screen->screen.is_format_supported = r300_is_format_supported;
    r300screen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
    r300screen->screen.context_create = r300_create_context;
    r300screen->screen.fence_reference = r300_fence_reference;
    r300screen->screen.fence_finish = r300_fence_finish;

    r300_init_screen_resource_functions(r300screen);

    slab_create_parent(&r300screen->pool_transfers, sizeof(struct pipe_transfer), 64);

    util_format_s3tc_init();
    pipe_mutex_init(r300screen->cmask_mutex);

    return &r300screen->screen;
}