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