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/**************************************************************************

 *

 * Copyright 2007 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.

 *

 **************************************************************************/

/**

 * Texture tile caching.

 *

 * Author:

 *    Brian Paul

 */

#include "util/u_inlines.h"

#include "util/u_memory.h"

#include "util/u_tile.h"

#include "util/u_format.h"

#include "util/u_math.h"

#include "sp_context.h"

#include "sp_texture.h"

#include "sp_tex_tile_cache.h"

struct softpipe_tex_tile_cache *

sp_create_tex_tile_cache( struct pipe_context *pipe )

{

   struct softpipe_tex_tile_cache *tc;

   uint pos;

   /* make sure max texture size works */

   assert((TEX_TILE_SIZE << TEX_ADDR_BITS) >= (1 << (SP_MAX_TEXTURE_2D_LEVELS-1)));

   tc = CALLOC_STRUCT( softpipe_tex_tile_cache );

   if (tc) {

      tc->pipe = pipe;

      for (pos = 0; pos < Elements(tc->entries); pos++) {

         tc->entries[pos].addr.bits.invalid = 1;

      }

      tc->last_tile = &tc->entries[0]; /* any tile */

   }

   return tc;

}

void

sp_destroy_tex_tile_cache(struct softpipe_tex_tile_cache *tc)

{

   if (tc) {

      uint pos;

      for (pos = 0; pos < Elements(tc->entries); pos++) {

         /*assert(tc->entries[pos].x < 0);*/

      }

      if (tc->transfer) {

         tc->pipe->transfer_unmap(tc->pipe, tc->transfer);

      }

      if (tc->tex_trans) {

         tc->pipe->transfer_unmap(tc->pipe, tc->tex_trans);

      }

      FREE( tc );

   }

}

/**

 * Invalidate all cached tiles for the cached texture.

 * Should be called when the texture is modified.

 */

void

sp_tex_tile_cache_validate_texture(struct softpipe_tex_tile_cache *tc)

{

   unsigned i;

   assert(tc);

   assert(tc->texture);

   for (i = 0; i < Elements(tc->entries); i++) {

      tc->entries[i].addr.bits.invalid = 1;

   }

}

static boolean

sp_tex_tile_is_compat_view(struct softpipe_tex_tile_cache *tc,

                           struct pipe_sampler_view *view)

{

   if (!view)

      return FALSE;

   return (tc->texture == view->texture &&

           tc->format == view->format &&

           tc->swizzle_r == view->swizzle_r &&

           tc->swizzle_g == view->swizzle_g &&

           tc->swizzle_b == view->swizzle_b &&

           tc->swizzle_a == view->swizzle_a);

}

/**

 * Specify the sampler view to cache.

 */

void

sp_tex_tile_cache_set_sampler_view(struct softpipe_tex_tile_cache *tc,

                                   struct pipe_sampler_view *view)

{

   struct pipe_resource *texture = view ? view->texture : NULL;

   uint i;

   assert(!tc->transfer);

   if (!sp_tex_tile_is_compat_view(tc, view)) {

      pipe_resource_reference(&tc->texture, texture);

      if (tc->tex_trans_map) {

         tc->pipe->transfer_unmap(tc->pipe, tc->tex_trans);

         tc->tex_trans = NULL;

         tc->tex_trans_map = NULL;

      }

      if (view) {

         tc->swizzle_r = view->swizzle_r;

         tc->swizzle_g = view->swizzle_g;

         tc->swizzle_b = view->swizzle_b;

         tc->swizzle_a = view->swizzle_a;

         tc->format = view->format;

      }

      /* mark as entries as invalid/empty */

      /* XXX we should try to avoid this when the teximage hasn't changed */

      for (i = 0; i < Elements(tc->entries); i++) {

         tc->entries[i].addr.bits.invalid = 1;

      }

      tc->tex_z = -1; /* any invalid value here */

   }

}

/**

 * Flush the tile cache: write all dirty tiles back to the transfer.

 * any tiles "flagged" as cleared will be "really" cleared.

 */

void

sp_flush_tex_tile_cache(struct softpipe_tex_tile_cache *tc)

{

   int pos;

   if (tc->texture) {

      /* caching a texture, mark all entries as empty */

      for (pos = 0; pos < Elements(tc->entries); pos++) {

         tc->entries[pos].addr.bits.invalid = 1;

      }

      tc->tex_z = -1;

   }

}

/**

 * Given the texture face, level, zslice, x and y values, compute

 * the cache entry position/index where we'd hope to find the

 * cached texture tile.

 * This is basically a direct-map cache.

 * XXX There's probably lots of ways in which we can improve this.

 */

static INLINE uint

tex_cache_pos( union tex_tile_address addr )

{

   uint entry = (addr.bits.x +

                 addr.bits.y * 9 +

                 addr.bits.z +

                 addr.bits.level * 7);

   return entry % NUM_TEX_TILE_ENTRIES;

}

/**

 * Similar to sp_get_cached_tile() but for textures.

 * Tiles are read-only and indexed with more params.

 */

const struct softpipe_tex_cached_tile *

sp_find_cached_tile_tex(struct softpipe_tex_tile_cache *tc,

                        union tex_tile_address addr )

{

   struct softpipe_tex_cached_tile *tile;

   boolean zs = util_format_is_depth_or_stencil(tc->format);

   tile = tc->entries + tex_cache_pos( addr );

   if (addr.value != tile->addr.value) {

      /* cache miss.  Most misses are because we've invalidated the

       * texture cache previously -- most commonly on binding a new

       * texture.  Currently we effectively flush the cache on texture

       * bind.

       */

#if 0

      _debug_printf("miss at %u:  x=%d y=%d z=%d face=%d level=%d\n"

                    "   tile %u:  x=%d y=%d z=%d face=%d level=%d\n",

                    pos, x/TILE_SIZE, y/TILE_SIZE, z, face, level,

                    pos, tile->addr.bits.x, tile->addr.bits.y, tile->z, tile->face, tile->level);

#endif

      /* check if we need to get a new transfer */

      if (!tc->tex_trans ||

          tc->tex_level != addr.bits.level ||

          tc->tex_z != addr.bits.z) {

         /* get new transfer (view into texture) */

         unsigned width, height, layer;

         if (tc->tex_trans_map) {

            tc->pipe->transfer_unmap(tc->pipe, tc->tex_trans);

            tc->tex_trans = NULL;

            tc->tex_trans_map = NULL;

         }

         width = u_minify(tc->texture->width0, addr.bits.level);

         if (tc->texture->target == PIPE_TEXTURE_1D_ARRAY) {

            height = tc->texture->array_size;

            layer = 0;

         }

         else {

            height = u_minify(tc->texture->height0, addr.bits.level);

            layer = addr.bits.z;

         }

         tc->tex_trans_map =

            pipe_transfer_map(tc->pipe, tc->texture,

                              addr.bits.level,

                              layer,

                              PIPE_TRANSFER_READ | PIPE_TRANSFER_UNSYNCHRONIZED,

                              0, 0, width, height, &tc->tex_trans);

         tc->tex_level = addr.bits.level;

         tc->tex_z = addr.bits.z;

      }

      /* Get tile from the transfer (view into texture), explicitly passing

       * the image format.

       */

      if (!zs && util_format_is_pure_uint(tc->format)) {

         pipe_get_tile_ui_format(tc->tex_trans, tc->tex_trans_map,

                                 addr.bits.x * TEX_TILE_SIZE,

                                 addr.bits.y * TEX_TILE_SIZE,

                                 TEX_TILE_SIZE,

                                 TEX_TILE_SIZE,

                                 tc->format,

                                 (unsigned *) tile->data.colorui);

      } else if (!zs && util_format_is_pure_sint(tc->format)) {

         pipe_get_tile_i_format(tc->tex_trans, tc->tex_trans_map,

                                addr.bits.x * TEX_TILE_SIZE,

                                addr.bits.y * TEX_TILE_SIZE,

                                TEX_TILE_SIZE,

                                TEX_TILE_SIZE,

                                tc->format,

                                (int *) tile->data.colori);

      } else {

         pipe_get_tile_rgba_format(tc->tex_trans, tc->tex_trans_map,

                                   addr.bits.x * TEX_TILE_SIZE,

                                   addr.bits.y * TEX_TILE_SIZE,

                                   TEX_TILE_SIZE,

                                   TEX_TILE_SIZE,

                                   tc->format,

                                   (float *) tile->data.color);

      }

      tile->addr = addr;

   }

   tc->last_tile = tile;

   return tile;

}