73 lines
2.3 KiB
Lua
73 lines
2.3 KiB
Lua
--[[
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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 number width;
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extern number phase;
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extern number thickness;
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extern number opacity;
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extern vec3 color;
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vec4 effect(vec4 c, Image tex, vec2 tc, vec2 _) {
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number v = .5*(sin(tc.y * 3.14159 / width * love_ScreenSize.y + phase) + 1.);
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c = Texel(tex,tc);
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//c.rgb = mix(color, c.rgb, mix(1, pow(v, thickness), opacity));
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c.rgb -= (color - c.rgb) * (pow(v,thickness) - 1.0) * opacity;
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return c;
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}]]
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local defaults = {
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width = 2,
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phase = 0,
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thickness = 1,
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opacity = 1,
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color = {0,0,0},
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}
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local setters = {}
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setters.width = function(v)
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shader:send("width", tonumber(v) or defaults.width)
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end
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setters.frequency = function(v)
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shader:send("width", love.graphics.getHeight()/(tonumber(v) or love.graphics.getHeight()))
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end
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setters.phase = function(v)
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shader:send("phase", tonumber(v) or defaults.phase)
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end
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setters.thickness = function(v)
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shader:send("thickness", math.max(0, tonumber(v) or defaults.thickness))
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end
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setters.opacity = function(v)
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shader:send("opacity", math.min(1, math.max(0, tonumber(v) or defaults.opacity)))
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end
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setters.color = function(c)
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assert(type(c) == "table" and #c == 3, "Invalid value for `color'")
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shader:send("color", {
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(tonumber(c[1]) or defaults.color[0]) / 255,
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(tonumber(c[2]) or defaults.color[1]) / 255,
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(tonumber(c[3]) or defaults.color[2]) / 255
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})
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end
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return moonshine.Effect{
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name = "scanlines",
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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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