/**************************************************************************
 * 
 * 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.
 * 
 **************************************************************************/

/**
 * \brief  quad colormask stage
 * \author Brian Paul
 */

#include "pipe/p_defines.h"
#include "util/u_math.h"
#include "util/u_memory.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
#include "sp_tile_cache.h"



/**
 * XXX colormask could be rolled into blending...
 */
static void
colormask_quad(struct quad_stage *qs, struct quad_header *quad)
{
   struct softpipe_context *softpipe = qs->softpipe;
   uint cbuf;

   /* loop over colorbuffer outputs */
   for (cbuf = 0; cbuf < softpipe->framebuffer.num_cbufs; cbuf++) {
      float dest[4][QUAD_SIZE];
      struct softpipe_cached_tile *tile
         = sp_get_cached_tile(softpipe,
                              softpipe->cbuf_cache[cbuf],
                              quad->x0, quad->y0);
      float (*quadColor)[4] = quad->outputs.color[cbuf];
      uint i, j;

      /* get/swizzle dest colors */
      for (j = 0; j < QUAD_SIZE; j++) {
         int x = (quad->x0 & (TILE_SIZE-1)) + (j & 1);
         int y = (quad->y0 & (TILE_SIZE-1)) + (j >> 1);
         for (i = 0; i < 4; i++) {
            dest[i][j] = tile->data.color[y][x][i];
         }
      }

      /* R */
      if (!(softpipe->blend->colormask & PIPE_MASK_R))
          COPY_4V(quadColor[0], dest[0]);

      /* G */
      if (!(softpipe->blend->colormask & PIPE_MASK_G))
          COPY_4V(quadColor[1], dest[1]);

      /* B */
      if (!(softpipe->blend->colormask & PIPE_MASK_B))
          COPY_4V(quadColor[2], dest[2]);

      /* A */
      if (!(softpipe->blend->colormask & PIPE_MASK_A))
          COPY_4V(quadColor[3], dest[3]);
   }

   /* pass quad to next stage */
   qs->next->run(qs->next, quad);
}


static void colormask_begin(struct quad_stage *qs)
{
   qs->next->begin(qs->next);
}


static void colormask_destroy(struct quad_stage *qs)
{
   FREE( qs );
}


struct quad_stage *sp_quad_colormask_stage( struct softpipe_context *softpipe )
{
   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);

   stage->softpipe = softpipe;
   stage->begin = colormask_begin;
   stage->run = colormask_quad;
   stage->destroy = colormask_destroy;

   return stage;
}