Implement cloud alpha overlay tiles layer

This works very well for the most part with
two small problems:

- Webtiles will not support this yet (in probability,
  this will stop any clouds showing in webtiles)

- Floor items interact strangely and will draw over
  the top of clouds instead of behind them

1 files changed, 4 insertions, 1 deletions

diff --git a/crawl-ref/source/view.cc b/crawl-ref/source/view.cc
index 179fed7772..3034c10d11 100644
--- a/crawl-ref/source/view.cc
+++ b/crawl-ref/source/view.cc
@@ -859,6 +859,7 @@ static int player_view_update_at(const coord_def &gc)
     else
         env.tile_bk_fg(gc) = env.tile_fg(ep);
     env.tile_bk_bg(gc) = env.tile_bg(ep);
+    env.tile_bk_cloud(gc) = env.tile_cloud(ep);
 #endif
 
     return ret;
@@ -901,7 +902,7 @@ static void _draw_outside_los(screen_cell_t *cell, const coord_def &gc)
     cell->colour = g.col;
 
 #ifdef USE_TILE
-    tileidx_out_of_los(&cell->tile.fg, &cell->tile.bg, gc);
+    tileidx_out_of_los(&cell->tile.fg, &cell->tile.bg, &cell->tile.cloud, gc);
 #endif
 }
 
@@ -927,6 +928,7 @@ static void _draw_player(screen_cell_t *cell,
 #ifdef USE_TILE
     cell->tile.fg = env.tile_fg(ep) = tileidx_player();
     cell->tile.bg = env.tile_bg(ep);
+    cell->tile.cloud = env.tile_cloud(ep);
     if (anim_updates)
         tile_apply_animations(cell->tile.bg, &env.tile_flv(gc));
 #else
@@ -945,6 +947,7 @@ static void _draw_los(screen_cell_t *cell,
 #ifdef USE_TILE
     cell->tile.fg = env.tile_fg(ep);
     cell->tile.bg = env.tile_bg(ep);
+    cell->tile.cloud = env.tile_cloud(ep);
     if (anim_updates)
         tile_apply_animations(cell->tile.bg, &env.tile_flv(gc));
 #else