/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 TUNGSTEN GRAPHICS 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.
 * 
 **************************************************************************/

#include "pipe/p_defines.h"
#include "pipe/p_util.h"
#include "pipe/p_inlines.h"
#include "pipe/p_winsys.h"
#include "util/p_tile.h"
#include "sp_context.h"
#include "sp_surface.h"



/**
 * Copy a rectangular region from one surface to another.
 * Surfaces must have same bpp.
 *
 * Assumes all values are within bounds -- no checking at this level -
 * do it higher up if required.
 */
static void
sp_surface_copy(struct pipe_context *pipe,
                unsigned do_flip,
		struct pipe_surface *dst,
		unsigned dstx, unsigned dsty,
		struct pipe_surface *src,
		unsigned srcx, unsigned srcy, unsigned width, unsigned height)
{
   void *dst_map = pipe->screen->surface_map( pipe->screen,
                                              dst,
                                              PIPE_BUFFER_USAGE_CPU_WRITE );

   const void *src_map = pipe->screen->surface_map( pipe->screen,
                                                    src,
                                                    PIPE_BUFFER_USAGE_CPU_READ );

   assert(dst->cpp == src->cpp);
   assert(src_map);
   assert(dst_map);

   /* If do_flip, invert src_y position and pass negative src stride */
   pipe_copy_rect(dst_map,
                  dst->cpp,
                  dst->pitch,
                  dstx, dsty,
                  width, height,
                  src_map,
                  do_flip ? -(int) src->pitch : src->pitch,
                  srcx, do_flip ? src->height - 1 - srcy : srcy);

   pipe->screen->surface_unmap(pipe->screen, src);
   pipe->screen->surface_unmap(pipe->screen, dst);
}


static void *
get_pointer(struct pipe_surface *dst, void *dst_map, unsigned x, unsigned y)
{
   return (char *)dst_map + (y * dst->pitch + x) * dst->cpp;
}


#define UBYTE_TO_USHORT(B) ((B) | ((B) << 8))


/**
 * Fill a rectangular sub-region.  Need better logic about when to
 * push buffers into AGP - will currently do so whenever possible.
 */
static void
sp_surface_fill(struct pipe_context *pipe,
		struct pipe_surface *dst,
		unsigned dstx, unsigned dsty,
		unsigned width, unsigned height, unsigned value)
{
   unsigned i, j;
   void *dst_map = pipe->screen->surface_map( pipe->screen,
                                              dst,
                                              PIPE_BUFFER_USAGE_CPU_WRITE );

   assert(dst->pitch > 0);
   assert(width <= dst->pitch);


   switch (dst->cpp) {
   case 1:
      {
	 ubyte *row = get_pointer(dst, dst_map, dstx, dsty);
         for (i = 0; i < height; i++) {
            memset(row, value, width);
	 row += dst->pitch;
         }
      }
      break;
   case 2:
      {
         ushort *row = get_pointer(dst, dst_map, dstx, dsty);
         for (i = 0; i < height; i++) {
            for (j = 0; j < width; j++)
               row[j] = (ushort) value;
            row += dst->pitch;
         }
      }
      break;
   case 4:
      {
         unsigned *row = get_pointer(dst, dst_map, dstx, dsty);
         for (i = 0; i < height; i++) {
            for (j = 0; j < width; j++)
               row[j] = value;
            row += dst->pitch;
         }
      }
      break;
   case 8:
      {
         /* expand the 4-byte clear value to an 8-byte value */
         ushort *row = (ushort *) get_pointer(dst, dst_map, dstx, dsty);
         ushort val0 = UBYTE_TO_USHORT((value >>  0) & 0xff);
         ushort val1 = UBYTE_TO_USHORT((value >>  8) & 0xff);
         ushort val2 = UBYTE_TO_USHORT((value >> 16) & 0xff);
         ushort val3 = UBYTE_TO_USHORT((value >> 24) & 0xff);
         val0 = (val0 << 8) | val0;
         val1 = (val1 << 8) | val1;
         val2 = (val2 << 8) | val2;
         val3 = (val3 << 8) | val3;
         for (i = 0; i < height; i++) {
            for (j = 0; j < width; j++) {
               row[j*4+0] = val0;
               row[j*4+1] = val1;
               row[j*4+2] = val2;
               row[j*4+3] = val3;
            }
            row += dst->pitch * 4;
         }
      }
      break;
   default:
      assert(0);
      break;
   }

   pipe->screen->surface_unmap(pipe->screen, dst);
}


void
sp_init_surface_functions(struct softpipe_context *sp)
{
   sp->pipe.surface_copy = sp_surface_copy;
   sp->pipe.surface_fill = sp_surface_fill;
}