80 lines
2.4 KiB
Lua
80 lines
2.4 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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-- Barrel distortion adapted from Daniel Oaks (see commit cef01b67fd)
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-- Added feather to mask out outside of distorted texture
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local distortionFactor
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local shader = love.graphics.newShader[[
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extern vec2 distortionFactor;
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extern vec2 scaleFactor;
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extern number feather;
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vec4 effect(vec4 color, Image tex, vec2 uv, vec2 px) {
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// to barrel coordinates
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uv = uv * 2.0 - vec2(1.0);
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// distort
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uv *= scaleFactor;
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uv += (uv.yx*uv.yx) * uv * (distortionFactor - 1.0);
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number mask = (1.0 - smoothstep(1.0-feather,1.0,abs(uv.x)))
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* (1.0 - smoothstep(1.0-feather,1.0,abs(uv.y)));
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// to cartesian coordinates
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uv = (uv + vec2(1.0)) / 2.0;
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return color * Texel(tex, uv) * mask;
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}
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]]
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local setters = {}
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setters.distortionFactor = function(v)
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assert(type(v) == "table" and #v == 2, "Invalid value for `distortionFactor'")
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distortionFactor = {unpack(v)}
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shader:send("distortionFactor", v)
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end
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setters.x = function(v) setters.distortionFactor{v, distortionFactor[2]} end
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setters.y = function(v) setters.distortionFactor{distortionFactor[1], v} end
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setters.scaleFactor = function(v)
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if type(v) == "table" and #v == 2 then
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shader:send("scaleFactor", v)
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elseif type(v) == "number" then
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shader:send("scaleFactor", {v,v})
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else
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error("Invalid value for `scaleFactor'")
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end
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end
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setters.feather = function(v) shader:send("feather", v) end
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local defaults = {
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distortionFactor = {1.06, 1.065},
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feather = 0.02,
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scaleFactor = 1,
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}
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return moonshine.Effect{
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name = "crt",
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shader = shader,
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setters = setters,
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defaults = defaults
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}
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end
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