C++ (Cpp) dri3_alloc_back_buffer示例

示例#1

文件： vl_winsys_dri3.c 项目： BNieuwenhuizen/mesa

static struct vl_dri3_buffer *
dri3_get_back_buffer(struct vl_dri3_screen *scrn)
{
   struct vl_dri3_buffer *buffer;
   struct pipe_resource *texture = NULL;

   assert(scrn);

   scrn->cur_back = dri3_find_back(scrn);
   if (scrn->cur_back < 0)
      return NULL;
   buffer = scrn->back_buffers[scrn->cur_back];

   if (!buffer || buffer->width != scrn->width ||
       buffer->height != scrn->height) {
      struct vl_dri3_buffer *new_buffer;

      new_buffer = dri3_alloc_back_buffer(scrn);
      if (!new_buffer)
         return NULL;

      if (buffer)
         dri3_free_back_buffer(scrn, buffer);

      vl_compositor_reset_dirty_area(&scrn->dirty_areas[scrn->cur_back]);
      buffer = new_buffer;
      scrn->back_buffers[scrn->cur_back] = buffer;
   }

   pipe_resource_reference(&texture, buffer->texture);
   xcb_flush(scrn->conn);
   xshmfence_await(buffer->shm_fence);

   return buffer;
}

示例#2

文件： vl_winsys_dri3.c 项目： ChristophHaag/mesa-mesa

static struct vl_dri3_buffer *
dri3_get_back_buffer(struct vl_dri3_screen *scrn)
{
   struct vl_dri3_buffer *buffer;
   struct pipe_resource *texture = NULL;
   bool allocate_new_buffer = false;
   int b, id;

   assert(scrn);

   scrn->cur_back = dri3_find_back(scrn);
   if (scrn->cur_back < 0)
      return NULL;
   buffer = scrn->back_buffers[scrn->cur_back];

   if (scrn->output_texture) {
      if (!buffer || buffer->width < scrn->width ||
          buffer->height < scrn->height)
         allocate_new_buffer = true;
      else if (scrn->is_different_gpu)
         /* In case of different gpu we can reuse the linear
          * texture so we only need to set the external
          * texture for copying
          */
         buffer->texture = scrn->output_texture;
      else {
         /* In case of a single gpu we search if the texture is
          * already present as buffer if not we get the
          * handle and pixmap for the texture that is set
          */
         for (b = 0; b < BACK_BUFFER_NUM; b++) {
            id = (b + scrn->cur_back) % BACK_BUFFER_NUM;
            buffer = scrn->back_buffers[id];
            if (buffer && !buffer->busy &&
                buffer->texture == scrn->output_texture) {
               scrn->cur_back = id;
               break;
            }
         }

         if (b == BACK_BUFFER_NUM) {
            allocate_new_buffer = true;
            scrn->cur_back = scrn->next_back;
            scrn->next_back = (scrn->next_back + 1) % BACK_BUFFER_NUM;
            buffer = scrn->back_buffers[scrn->cur_back];
         }
      }

   } else {
      if (!buffer || buffer->width != scrn->width ||
          buffer->height != scrn->height)
         allocate_new_buffer = true;
   }

   if (allocate_new_buffer) {
      struct vl_dri3_buffer *new_buffer;

      new_buffer = dri3_alloc_back_buffer(scrn);
      if (!new_buffer)
         return NULL;

      if (buffer)
         dri3_free_back_buffer(scrn, buffer);

      if (!scrn->output_texture)
         vl_compositor_reset_dirty_area(&scrn->dirty_areas[scrn->cur_back]);
      buffer = new_buffer;
      scrn->back_buffers[scrn->cur_back] = buffer;
   }

   pipe_resource_reference(&texture, buffer->texture);
   xcb_flush(scrn->conn);
   xshmfence_await(buffer->shm_fence);

   return buffer;
}