C++ softpipe_screen函数代码示例

static struct pipe_resource *
softpipe_resource_from_handle(struct pipe_screen *screen,
                              const struct pipe_resource *templat,
                              struct winsys_handle *whandle)
{
   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
   struct softpipe_resource *spr = CALLOC_STRUCT(softpipe_resource);
   if (!spr)
      return NULL;

   spr->base = *templat;
   pipe_reference_init(&spr->base.reference, 1);
   spr->base.screen = screen;

   spr->pot = (util_is_power_of_two(templat->width0) &&
               util_is_power_of_two(templat->height0) &&
               util_is_power_of_two(templat->depth0));

   spr->dt = winsys->displaytarget_from_handle(winsys,
                                               templat,
                                               whandle,
                                               &spr->stride[0]);
   if (!spr->dt)
      goto fail;

   return &spr->base;

 fail:
   FREE(spr);
   return NULL;
}

static int
softpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
{
   struct softpipe_screen *sp_screen = softpipe_screen(screen);
   switch(shader)
   {
   case PIPE_SHADER_FRAGMENT:
      return tgsi_exec_get_shader_param(param);
   case PIPE_SHADER_VERTEX:
   case PIPE_SHADER_GEOMETRY:
      switch (param) {
      case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
         if (sp_screen->use_llvm)
            /* Softpipe doesn't yet know how to tell draw/llvm about textures */
            return 0;
	 else
            return PIPE_MAX_SAMPLERS;
      default:
	 if (sp_screen->use_llvm)
            return draw_get_shader_param(shader, param);
         else
            return draw_get_shader_param_no_llvm(shader, param);
      }
   default:
      return 0;
   }
}

static void
gdi_present(struct pipe_screen *screen,
            struct pipe_resource *res,
            HDC hDC)
{
   /* This will fail if any interposing layer (trace, debug, etc) has
    * been introduced between the state-trackers and the pipe driver.
    *
    * Ideally this would get replaced with a call to
    * pipe_screen::flush_frontbuffer().
    *
    * Failing that, it may be necessary for intervening layers to wrap
    * other structs such as this stw_winsys as well...
    */

   struct sw_winsys *winsys = NULL;
   struct sw_displaytarget *dt = NULL;

#ifdef HAVE_LLVMPIPE
   if (use_llvmpipe) {
      winsys = llvmpipe_screen(screen)->winsys;
      dt = llvmpipe_resource(res)->dt;
      gdi_sw_display(winsys, dt, hDC);
      return;
   }
#endif

   winsys = softpipe_screen(screen)->winsys,
   dt = softpipe_resource(res)->dt,
   gdi_sw_display(winsys, dt, hDC);
}

static int
softpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
{
#ifdef HAVE_LLVM
   struct softpipe_screen *sp_screen = softpipe_screen(screen);
#endif
   switch(shader)
   {
   case PIPE_SHADER_FRAGMENT:
      return tgsi_exec_get_shader_param(param);
   case PIPE_SHADER_VERTEX:
   case PIPE_SHADER_GEOMETRY:
      switch (param) {
      case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
#ifdef HAVE_LLVM
         if (sp_screen->use_llvm)
            /* Softpipe doesn't yet know how to tell draw/llvm about textures */
            return 0;
#endif
         return PIPE_MAX_VERTEX_SAMPLERS;
      case PIPE_SHADER_CAP_INTEGERS:
#ifdef HAVE_LLVM /* gallivm doesn't support integers yet */
         if (sp_screen->use_llvm)
            return 0;
#endif
         /* fallthrough */
      default:
         return draw_get_shader_param(shader, param);
      }
   default:
      return 0;
   }
}

static void *
softpipe_surface_map( struct pipe_screen *screen,
                      struct pipe_surface *surface,
                      unsigned flags )
{
   ubyte *map;

   if (flags & ~surface->usage) {
      assert(0);
      return NULL;
   }

   map = pipe_buffer_map( screen, surface->buffer, flags );
   if (map == NULL)
      return NULL;

   /* May want to different things here depending on read/write nature
    * of the map:
    */
   if (surface->texture &&
       (flags & PIPE_BUFFER_USAGE_CPU_WRITE)) 
   {
      /* Do something to notify sharing contexts of a texture change.
       * In softpipe, that would mean flushing the texture cache.
       */
      softpipe_screen(screen)->timestamp++;
   }
   
   return map + surface->offset;
}

/* Hopefully this will remain quite simple, otherwise need to pull in
 * something like the state tracker mechanism.
 */
void
softpipe_update_derived(struct softpipe_context *softpipe, unsigned prim)
{
   struct softpipe_screen *sp_screen = softpipe_screen(softpipe->pipe.screen);

   /* Check for updated textures.
    */
   if (softpipe->tex_timestamp != sp_screen->timestamp) {
      softpipe->tex_timestamp = sp_screen->timestamp;
      softpipe->dirty |= SP_NEW_TEXTURE;
   }

#if DO_PSTIPPLE_IN_HELPER_MODULE
   if (softpipe->dirty & SP_NEW_STIPPLE)
      /* before updating samplers! */
      update_polygon_stipple_pattern(softpipe);
#endif

   if (softpipe->dirty & (SP_NEW_RASTERIZER |
                          SP_NEW_FS))
      update_fragment_shader(softpipe, prim);

#if DO_PSTIPPLE_IN_HELPER_MODULE
   if (softpipe->dirty & (SP_NEW_RASTERIZER |
                          SP_NEW_STIPPLE |
                          SP_NEW_FS))
      update_polygon_stipple_enable(softpipe, prim);
#endif

   /* TODO: this looks suboptimal */
   if (softpipe->dirty & (SP_NEW_SAMPLER |
                          SP_NEW_TEXTURE |
                          SP_NEW_FS | 
                          SP_NEW_VS))
      update_tgsi_samplers( softpipe );

   if (softpipe->dirty & (SP_NEW_RASTERIZER |
                          SP_NEW_FS |
                          SP_NEW_VS))
      invalidate_vertex_layout( softpipe );

   if (softpipe->dirty & (SP_NEW_SCISSOR |
                          SP_NEW_RASTERIZER |
                          SP_NEW_FRAMEBUFFER))
      compute_cliprect(softpipe);

   if (softpipe->dirty & (SP_NEW_BLEND |
                          SP_NEW_DEPTH_STENCIL_ALPHA |
                          SP_NEW_FRAMEBUFFER |
                          SP_NEW_STIPPLE |
                          SP_NEW_FS))
      sp_build_quad_pipeline(softpipe);

   softpipe->dirty = 0;
}

static void
softpipe_destroy_screen( struct pipe_screen *screen )
{
   struct softpipe_screen *sp_screen = softpipe_screen(screen);
   struct sw_winsys *winsys = sp_screen->winsys;

   if(winsys->destroy)
      winsys->destroy(winsys);

   FREE(screen);
}

/* This is often overriden by the co-state tracker.
 */
static void
softpipe_flush_frontbuffer(struct pipe_screen *_screen,
                           struct pipe_resource *resource,
                           unsigned level, unsigned layer,
                           void *context_private)
{
   struct softpipe_screen *screen = softpipe_screen(_screen);
   struct sw_winsys *winsys = screen->winsys;
   struct softpipe_resource *texture = softpipe_resource(resource);

   assert(texture->dt);
   if (texture->dt)
      winsys->displaytarget_display(winsys, texture->dt, context_private);
}

static boolean
softpipe_resource_get_handle(struct pipe_screen *screen,
                             struct pipe_resource *pt,
                             struct winsys_handle *whandle)
{
   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
   struct softpipe_resource *spr = softpipe_resource(pt);

   assert(spr->dt);
   if (!spr->dt)
      return FALSE;

   return winsys->displaytarget_get_handle(winsys, spr->dt, whandle);
}

/**
 * Texture layout for simple color buffers.
 */
static boolean
softpipe_displaytarget_layout(struct pipe_screen *screen,
                              struct softpipe_resource *spr)
{
   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;

   /* Round up the surface size to a multiple of the tile size?
    */
   spr->dt = winsys->displaytarget_create(winsys,
                                          spr->base.bind,
                                          spr->base.format,
                                          spr->base.width0, 
                                          spr->base.height0,
                                          16,
                                          &spr->stride[0] );

   return spr->dt != NULL;
}

static int
softpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
{
   struct softpipe_screen *sp_screen = softpipe_screen(screen);
   switch(shader)
   {
   case PIPE_SHADER_FRAGMENT:
      return tgsi_exec_get_shader_param(param);
   case PIPE_SHADER_VERTEX:
   case PIPE_SHADER_GEOMETRY:
      if (sp_screen->use_llvm)
         return draw_get_shader_param(shader, param);
      else
         return draw_get_shader_param_no_llvm(shader, param);
   default:
      return 0;
   }
}

static void
gdi_softpipe_present(struct pipe_screen *screen,
                     struct pipe_surface *surface,
                     HDC hDC)
{
   /* This will fail if any interposing layer (trace, debug, etc) has
    * been introduced between the state-trackers and softpipe.
    *
    * Ideally this would get replaced with a call to
    * pipe_screen::flush_frontbuffer().
    *
    * Failing that, it may be necessary for intervening layers to wrap
    * other structs such as this stw_winsys as well...
    */
   gdi_sw_display(softpipe_screen(screen)->winsys,
                  softpipe_resource(surface->texture)->dt,
                  hDC);
}

static void
softpipe_resource_destroy(struct pipe_screen *pscreen,
			  struct pipe_resource *pt)
{
   struct softpipe_screen *screen = softpipe_screen(pscreen);
   struct softpipe_resource *spr = softpipe_resource(pt);

   if (spr->dt) {
      /* display target */
      struct sw_winsys *winsys = screen->winsys;
      winsys->displaytarget_destroy(winsys, spr->dt);
   }
   else if (!spr->userBuffer) {
      /* regular texture */
      align_free(spr->data);
   }

   FREE(spr);
}

/**
 * Unmap memory mapping for given pipe_transfer object.
 */
static void
softpipe_transfer_unmap(struct pipe_context *pipe,
                        struct pipe_transfer *transfer)
{
   struct softpipe_resource *spr;

   assert(transfer->resource);
   spr = softpipe_resource(transfer->resource);

   if (spr->dt) {
      /* display target */
      struct sw_winsys *winsys = softpipe_screen(pipe->screen)->winsys;
      winsys->displaytarget_unmap(winsys, spr->dt);
   }

   if (transfer->usage & PIPE_TRANSFER_WRITE) {
      /* Mark the texture as dirty to expire the tile caches. */
      spr->timestamp++;
   }
}

static void *
softpipe_transfer_map( struct pipe_screen *screen,
                       struct pipe_transfer *transfer )
{
   ubyte *map, *xfer_map;
   struct softpipe_texture *spt;
   unsigned flags = 0;

   assert(transfer->texture);
   spt = softpipe_texture(transfer->texture);

   if (transfer->usage != PIPE_TRANSFER_READ) {
      flags |= PIPE_BUFFER_USAGE_CPU_WRITE;
   }

   if (transfer->usage != PIPE_TRANSFER_WRITE) {
      flags |= PIPE_BUFFER_USAGE_CPU_READ;
   }

   map = pipe_buffer_map(screen, spt->buffer, flags);
   if (map == NULL)
      return NULL;

   /* May want to different things here depending on read/write nature
    * of the map:
    */
   if (transfer->texture && transfer->usage != PIPE_TRANSFER_READ) 
   {
      /* Do something to notify sharing contexts of a texture change.
       * In softpipe, that would mean flushing the texture cache.
       */
      softpipe_screen(screen)->timestamp++;
   }
   
   xfer_map = map + softpipe_transfer(transfer)->offset +
      transfer->y / transfer->block.height * transfer->stride +
      transfer->x / transfer->block.width * transfer->block.size;
   /*printf("map = %p  xfer map = %p\n", map, xfer_map);*/
   return xfer_map;
}