/*************************************************************************
 * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com>     *
 *                                                                       *
 * This file is part of The Dimension Library.                           *
 *                                                                       *
 * The Dimension Library is free software; you can redistribute it and/  *
 * or modify it under the terms of the GNU Lesser General Public License *
 * as published by the Free Software Foundation; either version 3 of the *
 * License, or (at your option) any later version.                       *
 *                                                                       *
 * The Dimension Library is distributed in the hope that it will be      *
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
 * Lesser General Public License for more details.                       *
 *                                                                       *
 * You should have received a copy of the GNU Lesser General Public      *
 * License along with this program.  If not, see                         *
 * <http://www.gnu.org/licenses/>.                                       *
 *************************************************************************/

/**
 * @file
 * Textures.
 */

#include "dimension-internal.h"

/* Allocate a dummy texture */
dmnsn_texture *
dmnsn_new_texture(void)
{
  dmnsn_texture *texture = DMNSN_MALLOC(dmnsn_texture);
  texture->pigment     = NULL;
  texture->finish      = dmnsn_new_finish();
  texture->trans       = dmnsn_identity_matrix();
  texture->initialized = false;
  DMNSN_REFCOUNT_INIT(texture);
  return texture;
}

/* Free a texture */
void
dmnsn_delete_texture(dmnsn_texture *texture)
{
  if (DMNSN_DECREF(texture)) {
    dmnsn_delete_finish(texture->finish);
    dmnsn_delete_pigment(texture->pigment);
    dmnsn_free(texture);
  }
}

/* Calculate matrix inverses */
void
dmnsn_texture_initialize(dmnsn_texture *texture)
{
  dmnsn_assert(!texture->initialized, "Texture double-initialized.");
  texture->initialized = true;

  texture->trans_inv = dmnsn_matrix_inverse(texture->trans);

  if (!texture->pigment->initialized) {
    texture->pigment->trans = dmnsn_matrix_mul(texture->trans,
                                               texture->pigment->trans);
    dmnsn_pigment_initialize(texture->pigment);
  }
}

/* Cascade a texture */
void
dmnsn_texture_cascade(dmnsn_texture *default_texture,
                      dmnsn_texture **texturep)
{
  if (!*texturep) {
    *texturep = default_texture;
    DMNSN_INCREF(*texturep);
  }

  dmnsn_texture *texture = *texturep;

  if (!texture->pigment) {
    texture->pigment = default_texture->pigment;
    DMNSN_INCREF(texture->pigment);
  }

  dmnsn_finish_cascade(&default_texture->finish, &texture->finish);
}