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/*

 * Copyright © 2013 Intel Corporation

 *

 * 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, sublicense,

 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS 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 "main/mtypes.h"

#include "main/macros.h"

#include "main/samplerobj.h"

#include "main/texobj.h"

#include "brw_context.h"

#include "intel_mipmap_tree.h"

#include "intel_blit.h"

#include "intel_tex.h"

#define FILE_DEBUG_FLAG DEBUG_TEXTURE

/**

 * Sets our driver-specific variant of tObj->_MaxLevel for later surface state

 * upload.

 *

 * If we're only ensuring that there is storage for the first miplevel of a

 * texture, then in texture setup we're going to have to make sure we don't

 * allow sampling beyond level 0.

 */

static void

intel_update_max_level(struct intel_texture_object *intelObj,

		       struct gl_sampler_object *sampler)

{

   struct gl_texture_object *tObj = &intelObj->base;

   if (!tObj->_MipmapComplete ||

       (tObj->_RenderToTexture &&

        (sampler->MinFilter == GL_NEAREST ||

         sampler->MinFilter == GL_LINEAR))) {

      intelObj->_MaxLevel = tObj->BaseLevel;

   } else {

      intelObj->_MaxLevel = tObj->_MaxLevel;

   }

}

/**

 * At rendering-from-a-texture time, make sure that the texture object has a

 * miptree that can hold the entire texture based on

 * BaseLevel/MaxLevel/filtering, and copy in any texture images that are

 * stored in other miptrees.

 */

GLuint

intel_finalize_mipmap_tree(struct brw_context *brw, GLuint unit)

{

   struct gl_context *ctx = &brw->ctx;

   struct gl_texture_object *tObj = ctx->Texture.Unit[unit]._Current;

   struct intel_texture_object *intelObj = intel_texture_object(tObj);

   struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit);

   GLuint face, i;

   GLuint nr_faces = 0;

   struct intel_texture_image *firstImage;

   int width, height, depth;

   /* TBOs require no validation -- they always just point to their BO. */

   if (tObj->Target == GL_TEXTURE_BUFFER)

      return true;

   /* We know that this is true by now, and if it wasn't, we might have

    * mismatched level sizes and the copies would fail.

    */

   assert(intelObj->base._BaseComplete);

   intel_update_max_level(intelObj, sampler);

   /* What levels does this validated texture image require? */

   int validate_first_level = tObj->BaseLevel;

   int validate_last_level = intelObj->_MaxLevel;

   /* Skip the loop over images in the common case of no images having

    * changed.  But if the GL_BASE_LEVEL or GL_MAX_LEVEL change to something we

    * haven't looked at, then we do need to look at those new images.

    */

   if (!intelObj->needs_validate &&

       validate_first_level >= intelObj->validated_first_level &&

       validate_last_level <= intelObj->validated_last_level) {

      return true;

   }

   /* On recent generations, immutable textures should not get this far

    * -- they should have been created in a validated state, and nothing

    * can invalidate them.

    *

    * Unfortunately, this is not true on pre-Sandybridge hardware -- when

    * rendering into an immutable-format depth texture we may have to rebase

    * the rendered levels to meet alignment requirements.

    *

    * FINISHME: Avoid doing this.

    */

   assert(!tObj->Immutable || brw->gen < 6);

   firstImage = intel_texture_image(tObj->Image[0][tObj->BaseLevel]);

   /* Check tree can hold all active levels.  Check tree matches

    * target, imageFormat, etc.

    */

   if (intelObj->mt &&

       (!intel_miptree_match_image(intelObj->mt, &firstImage->base.Base) ||

	validate_first_level < intelObj->mt->first_level ||

	validate_last_level > intelObj->mt->last_level)) {

      intel_miptree_release(&intelObj->mt);

   }

   /* May need to create a new tree:

    */

   if (!intelObj->mt) {

      intel_miptree_get_dimensions_for_image(&firstImage->base.Base,

					     &width, &height, &depth);

      perf_debug("Creating new %s %dx%dx%d %d-level miptree to handle "

                 "finalized texture miptree.\n",

                 _mesa_get_format_name(firstImage->base.Base.TexFormat),

                 width, height, depth, validate_last_level + 1);

      intelObj->mt = intel_miptree_create(brw,

                                          intelObj->base.Target,

					  firstImage->base.Base.TexFormat,

                                          0, /* first_level */

                                          validate_last_level,

                                          width,

                                          height,

                                          depth,

					  true,

                                          INTEL_MIPTREE_TILING_ANY,

                                          false);

      if (!intelObj->mt)

         return false;

   }

   /* Pull in any images not in the object's tree:

    */

   nr_faces = _mesa_num_tex_faces(intelObj->base.Target);

   for (face = 0; face < nr_faces; face++) {

      for (i = validate_first_level; i <= validate_last_level; i++) {

         struct intel_texture_image *intelImage =

            intel_texture_image(intelObj->base.Image[face][i]);

	 /* skip too small size mipmap */

 	 if (intelImage == NULL)

		 break;

         if (intelObj->mt != intelImage->mt) {

            intel_miptree_copy_teximage(brw, intelImage, intelObj->mt,

                                        false /* invalidate */);

         }

         /* After we're done, we'd better agree that our layout is

          * appropriate, or we'll end up hitting this function again on the

          * next draw

          */

         assert(intel_miptree_match_image(intelObj->mt, &intelImage->base.Base));

      }

   }

   intelObj->validated_first_level = validate_first_level;

   intelObj->validated_last_level = validate_last_level;

   intelObj->_Format = intelObj->mt->format;

   intelObj->needs_validate = false;

   return true;

}