Trees and some big plants will gently swing in the wind

game/modules/tome/class/Grid.lua

@@ -201,6 +201,7 @@ function _M:makeTrees(base, max, bigheight_limit, tint)
 			display_h = treeid < (bigheight_limit or 9) and 1 or 2,
 			image = (base or "terrain/tree_alpha")..treeid..".png",
 			tint = tint,
+			shader = "tree",
 		}
 	end
 

game/modules/tome/data/general/grids/forest.lua

@@ -136,6 +136,7 @@ newEntity{
 	change_level = 1,
 	change_zone = "wilderness",
 	nice_editer = grass_editer,
+	shader = "tree",
 }
 
 newEntity{

game/modules/tome/data/general/grids/jungle.lua

@@ -41,7 +41,7 @@ for i = 1, 4 do
 	newEntity{ base = "JUNGLE_GRASS", define_as = "JUNGLE_GRASS_PATCH"..(i+5+8+3), add_displays={class.new{z=3,image = "terrain/jungle/jungle_dirt_var_"..i.."_64_01.png"}} }
 end
 for i = 1, 4 do
-	newEntity{ base = "JUNGLE_GRASS", define_as = "JUNGLE_GRASS_PATCH"..(i+5+8+3+4), add_displays={class.new{z=3,image = "terrain/jungle/jungle_plant_0"..i..".png"}} }
+	newEntity{ base = "JUNGLE_GRASS", define_as = "JUNGLE_GRASS_PATCH"..(i+5+8+3+4), add_displays={class.new{z=3,image = "terrain/jungle/jungle_plant_0"..i..".png", shader="tree"}} }
 end
 
 newEntity{

game/modules/tome/data/gfx/shaders/tree.frag

+uniform sampler2D tex;
+uniform float tick;
+uniform vec2 mapCoord;
+
+void main(void)
+{
+	float time = tick / 1000.0;
+	vec2 xy = gl_TexCoord[0].xy;
+	if (xy.y <= 0.5) xy.x = xy.x + (0.5-xy.y) * sin(time + mapCoord.x / 40 + mapCoord.y) / 14.0;
+	gl_FragColor = texture2D(tex, xy) * gl_Color;
+}

game/modules/tome/data/gfx/shaders/tree.lua

+-- ToME - Tales of Maj'Eyal
+-- Copyright (C) 2009 - 2014 Nicolas Casalini
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program 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 General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+--
+-- Nicolas Casalini "DarkGod"
+-- darkgod@te4.org
+
+return {
+	frag = "tree",
+	vert = nil,
+	args = {
+	},
+	clone = false,
+}