sw_winsys.h

/**************************************************************************
 * 
 * Copyright 2007-2009 VMware, Inc.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 **************************************************************************/

/**
 * @file
 * Software rasterizer winsys.
 */


#ifndef SW_WINSYS_H
#define SW_WINSYS_H


#include "pipe/p_format.h"
#include "frontend/winsys_handle.h"

#ifdef __cplusplus
extern "C" {
#endif


struct pipe_screen;
struct pipe_context;
struct pipe_resource;
struct pipe_box;

/**
 * Opaque pointer.
 */
struct sw_displaytarget;


/**
 * This is the interface that sw expects any window system
 * hosting it to implement.
 * 
 * sw is for the most part a self sufficient driver. The only thing it
 * does not know is how to display a surface.
 */
struct sw_winsys
{
   void 
   (*destroy)( struct sw_winsys *ws );

   bool
   (*is_displaytarget_format_supported)( struct sw_winsys *ws,
                                         unsigned tex_usage,
                                         enum pipe_format format );
   
   /**
    * Allocate storage for a render target.
    * 
    * Often surfaces which are meant to be blitted to the front screen (i.e.,
    * display targets) must be allocated with special characteristics, memory 
    * pools, or obtained directly from the windowing system.
    *  
    * This callback is invoked by the pipe_screen when creating a texture marked
    * with the PIPE_BIND_DISPLAY_TARGET flag to get the underlying 
    * storage.
    */
   struct sw_displaytarget *
   (*displaytarget_create)( struct sw_winsys *ws,
                            unsigned tex_usage,
                            enum pipe_format format,
                            unsigned width, unsigned height,
                            unsigned alignment,
                            const void *front_private,
                            unsigned *stride );

   /**
    * Used to implement texture_from_handle.
    */
   struct sw_displaytarget *
   (*displaytarget_from_handle)( struct sw_winsys *ws,
                                 const struct pipe_resource *templat,
                                 struct winsys_handle *whandle,
                                 unsigned *stride );

   /**
    * Used to implement texture_get_handle.
    */
   bool
   (*displaytarget_get_handle)( struct sw_winsys *ws,
                                struct sw_displaytarget *dt,
                                struct winsys_handle *whandle );

   /**
    * \param flags  bitmask of PIPE_MAP_x flags
    */
   void *
   (*displaytarget_map)( struct sw_winsys *ws, 
                         struct sw_displaytarget *dt,
                         unsigned flags );

   void
   (*displaytarget_unmap)( struct sw_winsys *ws,
                           struct sw_displaytarget *dt );

   /**
    * @sa pipe_screen:flush_frontbuffer.
    *
    * This call will likely become asynchronous eventually.
    */
   void
   (*displaytarget_display)( struct sw_winsys *ws, 
                             struct sw_displaytarget *dt,
                             void *context_private,
                             struct pipe_box *box );

   void 
   (*displaytarget_destroy)( struct sw_winsys *ws, 
                             struct sw_displaytarget *dt );
};



#ifdef __cplusplus
}
#endif

#endif /* SW_WINSYS_H */