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--[[
The MIT License (MIT)
Copyright (c) 2017 Matthias Richter
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
]]--
local BASE = ...
local moonshine = {}
moonshine.draw_shader = function(buffer, shader)
local front, back = buffer()
love.graphics.setCanvas(front)
love.graphics.clear()
if shader ~= love.graphics.getShader() then
love.graphics.setShader(shader)
end
love.graphics.draw(back)
end
moonshine.chain = function(w,h,effect)
-- called as moonshine.chain(effect)'
if h == nil then
effect, w,h = w, love.window.getMode()
end
assert(effect ~= nil, "No effect")
local front, back = love.graphics.newCanvas(w,h), love.graphics.newCanvas(w,h)
local buffer = function()
back, front = front, back
return front, back
end
local disabled = {} -- set of disabled effects
local chain = {}
chain.resize = function(w, h)
front, back = love.graphics.newCanvas(w,h), love.graphics.newCanvas(w,h)
return chain
end
chain.draw = function(func, ...)
-- save state
local canvas = love.graphics.getCanvas()
local shader = love.graphics.getShader()
local fg_r, fg_g, fg_b, fg_a = love.graphics.getColor()
-- draw scene to front buffer
love.graphics.setCanvas((buffer())) -- parens are needed: take only front buffer
love.graphics.clear(love.graphics.getBackgroundColor())
func(...)
-- save more state
local blendmode = love.graphics.getBlendMode()
-- process all shaders
love.graphics.setColor(fg_r, fg_g, fg_b, fg_a)
love.graphics.setBlendMode("alpha", "premultiplied")
for _,e in ipairs(chain) do
if not disabled[e.name] then
(e.draw or moonshine.draw_shader)(buffer, e.shader)
end
end
-- present result
love.graphics.setShader()
love.graphics.setCanvas(canvas)
love.graphics.draw(front,0,0)
-- restore state
love.graphics.setBlendMode(blendmode)
love.graphics.setShader(shader)
end
chain.next = function(e)
if type(e) == "function" then
e = e()
end
assert(e.name, "Invalid effect: must provide `name'.")
assert(e.shader or e.draw, "Invalid effect: must provide `shader' or `draw'.")
table.insert(chain, e)
return chain
end
chain.chain = chain.next
chain.disable = function(name, ...)
if name then
disabled[name] = name
return chain.disable(...)
end
end
chain.enable = function(name, ...)
if name then
disabled[name] = nil
return chain.enable(...)
end
end
setmetatable(chain, {
__call = function(_, ...) return chain.draw(...) end,
__index = function(_,k)
for _, e in ipairs(chain) do
if e.name == k then return e end
end
error(("Effect `%s' not in chain"):format(k), 2)
end,
__newindex = function(_, k, v)
if k == "parameters" or k == "params" or k == "settings" then
for e,par in pairs(v) do
for k,v in pairs(par) do
chain[e][k] = v
end
end
else
rawset(chain, k, v)
end
end
})
return chain.next(effect)
end
moonshine.Effect = function(e)
-- set defaults
for k,v in pairs(e.defaults or {}) do
assert(e.setters[k], ("No setter for parameter `%s'"):format(k))(v, k)
e.setters[k](v,k)
end
-- expose setters
return setmetatable(e, {
__newindex = function(self,k,v)
assert(self.setters[k], ("Unknown property: `%s.%s'"):format(e.name, k))
self.setters[k](v, k)
end})
end
-- autoloading effects
moonshine.effects = setmetatable({}, {__index = function(self, key)
local ok, effect = pcall(require, BASE .. "." .. key)
if not ok then
error("No such effect: "..key, 2)
end
-- expose moonshine to effect
local con = function(...) return effect(moonshine, ...) end
-- cache effect constructor
self[key] = con
return con
end})
return setmetatable(moonshine, {__call = function(_, ...) return moonshine.chain(...) end})
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