56 lines
1.8 KiB
Lua
56 lines
1.8 KiB
Lua
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--[[
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Public domain:
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Copyright (C) 2017 by Matthias Richter <vrld@vrld.org>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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]]--
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return function(moonshine)
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local shader = love.graphics.newShader[[
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extern vec2 size;
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extern number feedback;
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vec4 effect(vec4 color, Image tex, vec2 tc, vec2 _)
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{
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vec4 c = Texel(tex, tc);
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// average pixel color over 5 samples
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vec2 scale = love_ScreenSize.xy / size;
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tc = floor(tc * scale + vec2(.5));
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vec4 meanc = Texel(tex, tc/scale);
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meanc += Texel(tex, (tc+vec2( 1.0, .0))/scale);
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meanc += Texel(tex, (tc+vec2(-1.0, .0))/scale);
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meanc += Texel(tex, (tc+vec2( .0, 1.0))/scale);
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meanc += Texel(tex, (tc+vec2( .0,-1.0))/scale);
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return color * mix(.2*meanc, c, feedback);
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}
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]]
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local setters = {}
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setters.size = function(v)
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if type(v) == "number" then v = {v,v} end
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assert(type(v) == "table" and #v == 2, "Invalid value for `size'")
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shader:send("size", v)
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end
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setters.feedback = function(v)
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shader:send("feedback", math.min(1, math.max(0, tonumber(v) or 0)))
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end
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return moonshine.Effect{
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name = "pixelate",
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shader = shader,
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setters = setters,
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defaults = {size = {5,5}, feedback = 0}
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}
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end
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