64 lines
2 KiB
Lua
64 lines
2 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 noisetex = love.image.newImageData(256,256)
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noisetex:mapPixel(function()
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local l = love.math.random() * 255
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return l,l,l,l
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end)
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noisetex = love.graphics.newImage(noisetex)
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local shader = love.graphics.newShader[[
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extern number opacity;
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extern number size;
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extern vec2 noise;
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extern Image noisetex;
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extern vec2 tex_ratio;
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float rand(vec2 co) {
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return Texel(noisetex, mod(co * tex_ratio / vec2(size), vec2(1.0))).r;
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}
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vec4 effect(vec4 color, Image texture, vec2 tc, vec2 _) {
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return color * Texel(texture, tc) * mix(1.0, rand(tc+vec2(noise)), opacity);
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}]]
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shader:send("noisetex", noisetex)
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shader:send("tex_ratio", {love.graphics.getWidth() / noisetex:getWidth(),
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love.graphics.getHeight() / noisetex:getHeight()})
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local setters = {}
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for _,k in ipairs{"opacity", "size"} do
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setters[k] = function(v) shader:send(k, math.max(0, tonumber(v) or 0)) end
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end
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local defaults = {opacity = .3, size = 1}
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local draw = function(buffer)
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shader:send("noise", {love.math.random(), love.math.random()})
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moonshine.draw_shader(buffer, shader)
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end
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return moonshine.Effect{
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name = "filmgrain",
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draw = draw,
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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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