layer_fog.cpp

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// SPDX-License-Identifier: GPLv3-or-later
// SPDX-FileCopyrightText: Freeciv authors
// SPDX-FileCopyrightText: Freeciv21 authors
// SPDX-FileCopyrightText: Louis Moureaux <m_louis30@yahoo.com>
 
#include "layer_fog.h"
 
#include "climap.h"
#include "colors_common.h"
#include "tilespec.h"
 
namespace freeciv {
 
layer_fog::layer_fog(struct tileset *ts, fog_style style,
                     darkness_style darkness)
    : freeciv::layer(ts, LAYER_FOG), m_style(style), m_darkness(darkness)
{
}
 
void layer_fog::load_sprites()
{
  m_fog_sprite = load_sprite({"tx.fog"}, true);
 
  if (m_darkness == DARKNESS_CORNER) {
    for (int i = 0; i < 81 /* 3^4 */; i++) {
      // Unknown, fog, known.
      const QChar ids[] = {'u', 'f', 'k'};
      auto buf = QStringLiteral("t.fog");
      int values[4], k = i;
 
      for (int vi = 0; vi < 4; vi++) {
        values[vi] = k % 3;
        k /= 3;
 
        buf += QStringLiteral("_") + ids[values[vi]];
      }
      fc_assert(k == 0);
 
      m_darkness_sprites.push_back(load_sprite({buf}));
    }
  }
}
 
std::vector<drawn_sprite>
layer_fog::fill_sprite_array(const tile *ptile, const tile_edge *pedge,
                             const tile_corner *pcorner,
                             const unit *punit) const
{
  std::vector<drawn_sprite> sprs;
 
  if (m_style == FOG_SPRITE && gui_options->draw_fog_of_war && ptile
      && client_tile_get_known(ptile) == TILE_KNOWN_UNSEEN) {
    sprs.emplace_back(tileset(), m_darkness_sprites[0]);
  }
 
  if (m_darkness == DARKNESS_CORNER && pcorner
      && gui_options->draw_fog_of_war) {
    int tileno = 0;
 
    for (int i = 3; i >= 0; i--) {
      const int unknown = 0, fogged = 1, known = 2;
      int value = -1;
 
      if (!pcorner->tile[i]) {
        value = fogged;
      } else {
        switch (client_tile_get_known(pcorner->tile[i])) {
        case TILE_KNOWN_SEEN:
          value = known;
          break;
        case TILE_KNOWN_UNSEEN:
          value = fogged;
          break;
        case TILE_UNKNOWN:
          value = unknown;
          break;
        }
      }
      fc_assert(value >= 0 && value < 3);
 
      tileno = tileno * 3 + value;
    }
 
    if (m_darkness_sprites[tileno]) {
      sprs.emplace_back(tileset(), m_darkness_sprites[tileno]);
    }
  }
 
  return sprs;
}
 
} // namespace freeciv