Merge pull request #138 from daviDarthemis/dev

Grass improvements

lib/VoxelScene.lua

@@ -934,6 +934,9 @@ function VoxelScene.render(state, w, h, vw, vh, paletteFor, eyes)
   local GlassMask = V.require("GlassMask")
   Voxel3D.glassMask = outdoor and GlassMask.texture(state.map.tileset) or nil
   Voxel3D.glassNight = outdoor and DayNight.windowLight() or 0
+  -- The existing day/night ramp is also a darkness factor. Fireflies fade
+  -- in naturally at dusk and reach full contrast only at deepest night.
+  Voxel3D.fireflyNight = outdoor and DayNight.windowLight() or 0
   local g = VoxelScene.glintStep(glint, cx, cy)
   Voxel3D.glassPhase, Voxel3D.glassGlint = g.phase, g.amp
   -- and the map's atmosphere, if it has one (see ForestAtmos): the haze
@@ -1186,6 +1189,21 @@ function VoxelScene.render(state, w, h, vw, vh, paletteFor, eyes)
   -- so the tuft rows keep exactly the characters' own depth handicap
   local lean = math.max(leanAngle(), 0.05)
   local pull = VoxelScene.pull(lean)
+  -- Character px/py is anchored on the 16 px card. Its world centre/feet
+  -- contact used by the camera code is +8,+8, so use the same point here.
+  -- Keep the prior rendered point so fast steps sweep through every tuft.
+  local gx, gz = -100000, -100000
+  if me then gx, gz = me.px + 8, me.py + 8 end
+  VoxelScene._grassPrevX = VoxelScene._grassPrevX or gx
+  VoxelScene._grassPrevZ = VoxelScene._grassPrevZ or gz
+  -- A warp/map transition is not a walk. Do not sweep one enormous contact
+  -- segment across the new map when the player jumps more than two tiles.
+  local gdx, gdz = gx - VoxelScene._grassPrevX, gz - VoxelScene._grassPrevZ
+  if gdx * gdx + gdz * gdz > 32 * 32 then
+    VoxelScene._grassPrevX, VoxelScene._grassPrevZ = gx, gz
+  end
+  Voxel3D.grassWind(true, gx, gz,
+                    VoxelScene._grassPrevX, VoxelScene._grassPrevZ)
   Voxel3D.draw(ChunkMesher.grass(state.map), atlasFor(state.map), nil, pull)
   for _, nb in ipairs(state.neighbors or {}) do
     if ViewBox.showsMap(nb) then
@@ -1193,6 +1211,8 @@ function VoxelScene.render(state, w, h, vw, vh, paletteFor, eyes)
                    Mat4.translate(nb.ox, 0, nb.oy), pull)
     end
   end
+  Voxel3D.grassWind(false)
+  VoxelScene._grassPrevX, VoxelScene._grassPrevZ = gx, gz
   -- flower billboards: pulled like the characters and the grass, MINUS
   -- the depth of 8 world pixels along the view (8 sin a -- the camera
   -- looks along (0, -cos a, -sin a), so that is exactly one tile row of