65 lines
2.2 KiB
Lua
65 lines
2.2 KiB
Lua
|
--[[
|
||
|
|
The MIT License (MIT)
|
||
|
|
|
||
|
|
Copyright (c) 2015 Martin Felis
|
||
|
|
Copyright (c) 2017 Matthias Richter
|
||
|
|
|
||
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
of this software and associated documentation files (the "Software"), to deal
|
||
|
|
in the Software without restriction, including without limitation the rights
|
||
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
copies of the Software, and to permit persons to whom the Software is
|
||
|
|
furnished to do so, subject to the following conditions:
|
||
|
|
|
||
|
|
The above copyright notice and this permission notice shall be included in all
|
||
|
|
copies or substantial portions of the Software.
|
||
|
|
|
||
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
SOFTWARE.
|
||
|
|
]]--
|
||
|
|
|
||
|
|
return function(moonshine)
|
||
|
|
local noisetex = love.image.newImageData(256,256)
|
||
|
|
noisetex:mapPixel(function()
|
||
|
|
return love.math.random() * 255,love.math.random() * 255, 0, 0
|
||
|
|
end)
|
||
|
|
noisetex = love.graphics.newImage(noisetex)
|
||
|
|
noisetex:setWrap ("repeat", "repeat")
|
||
|
|
noisetex:setFilter("nearest", "nearest")
|
||
|
|
|
||
|
|
local shader = love.graphics.newShader[[
|
||
|
|
extern Image noisetex;
|
||
|
|
extern number amp;
|
||
|
|
extern vec2 center;
|
||
|
|
|
||
|
|
vec4 effect(vec4 color, Image texture, vec2 tc, vec2 _) {
|
||
|
|
vec2 displacement = Texel(noisetex, tc + center).rg;
|
||
|
|
tc += normalize(displacement * 2.0 - vec2(1.0)) * amp;
|
||
|
|
|
||
|
|
return Texel(texture, tc);
|
||
|
|
}]]
|
||
|
|
|
||
|
|
shader:send("noisetex", noisetex)
|
||
|
|
|
||
|
|
local setters = {}
|
||
|
|
setters.amp = function(v)
|
||
|
|
shader:send("amp", math.max(0, tonumber(v) or 0))
|
||
|
|
end
|
||
|
|
setters.center = function(v)
|
||
|
|
assert(type(v) == "table" and #v == 2, "Invalid value for `center'")
|
||
|
|
shader:send("center", v)
|
||
|
|
end
|
||
|
|
|
||
|
|
return moonshine.Effect{
|
||
|
|
name = "sketch",
|
||
|
|
shader = shader,
|
||
|
|
setters = setters,
|
||
|
|
defaults = {amp = .0007, center = {0,0}}
|
||
|
|
}
|
||
|
|
end
|