62 lines
2 KiB
Lua
62 lines
2 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 radius_x, radius_y = 3, 3
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local shader = love.graphics.newShader[[
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extern vec2 direction;
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extern number radius;
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vec4 effect(vec4 color, Image texture, vec2 tc, vec2 _) {
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vec4 c = vec4(0.0);
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for (float i = -radius; i <= radius; i += 1.0)
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{
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c += Texel(texture, tc + i * direction);
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}
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return c / (2.0 * radius + 1.0) * color;
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}]]
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local setters = {}
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setters.radius = function(v)
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if type(v) == "number" then
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radius_x, radius_y = v, v
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elseif type(v) == "table" and #v >= 2 then
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radius_x, radius_y = tonumber(v[1] or v.h or v.x), tonumber(v[2] or v.v or v.y)
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else
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error("Invalid argument `radius'")
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end
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end
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setters.radius_x = function(v) radius_x = tonumber(v) end
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setters.radius_y = function(v) radius_y = tonumber(v) end
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local draw = function(buffer)
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shader:send('direction', {1 / love.graphics.getWidth(), 0})
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shader:send('radius', math.floor(radius_x + .5))
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moonshine.draw_shader(buffer, shader)
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shader:send('direction', {0, 1 / love.graphics.getHeight()})
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shader:send('radius', math.floor(radius_y + .5))
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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 = "boxblur",
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draw = draw,
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setters = setters,
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defaults = {radius = 3}
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}
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end
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