Haiku Now Has Experimental 3D Acceleration

I looked at Zink code a bit and it seems possible to replace softpipe driver of existing Haiku Gallium add-on with Zink driver. It use memcpy() to draw surface:

static void
zink_flush_frontbuffer(struct pipe_screen *pscreen,
                       struct pipe_context *pcontext,
                       struct pipe_resource *pres,
                       unsigned level, unsigned layer,
                       void *winsys_drawable_handle,
                       struct pipe_box *sub_box)
{
   struct zink_screen *screen = zink_screen(pscreen);
   struct sw_winsys *winsys = screen->winsys;
   struct zink_resource *res = zink_resource(pres);

   if (!winsys)
     return;
   void *map = winsys->displaytarget_map(winsys, res->dt, 0);

   if (map) {
      VkImageSubresource isr = {};
      isr.aspectMask = res->aspect;
      isr.mipLevel = level;
      isr.arrayLayer = layer;
      VkSubresourceLayout layout;
      vkGetImageSubresourceLayout(screen->dev, res->image, &isr, &layout);

      void *ptr;
      VkResult result = vkMapMemory(screen->dev, res->mem, res->offset, res->size, 0, &ptr);
      if (result != VK_SUCCESS) {
         debug_printf("failed to map memory for display\n");
         return;
      }
      for (int i = 0; i < pres->height0; ++i) {
         uint8_t *src = (uint8_t *)ptr + i * layout.rowPitch;
         uint8_t *dst = (uint8_t *)map + i * res->dt_stride;
         memcpy(dst, src, res->dt_stride);
      }
      vkUnmapMemory(screen->dev, res->mem);
   }

   winsys->displaytarget_unmap(winsys, res->dt);

   assert(res->dt);
   if (res->dt)
      winsys->displaytarget_display(winsys, res->dt, winsys_drawable_handle, sub_box);
}

from Hacker News https://ift.tt/3d2rEbx