mirror of
https://github.com/tanema/light_world.lua.git
synced 2024-12-24 20:24:19 +00:00
106 lines
3.1 KiB
Lua
106 lines
3.1 KiB
Lua
local util = {}
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local tempCanvas
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--TODO: the whole stencil/canvas system should be reviewed since it has been changed in a naive way
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function util.process(canvas, options)
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--TODO: now you cannot draw a canvas to itself
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if not tempCanvas then
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tempCanvas = love.graphics.newCanvas()
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end
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util.drawCanvasToCanvas(canvas, tempCanvas, options)
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util.drawCanvasToCanvas(tempCanvas, canvas, options)
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end
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function util.drawCanvasToCanvas(canvas, other_canvas, options)
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options = options or {}
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util.drawto(other_canvas, 0, 0, 1, options['stencil'] or options['istencil'] and true or false, function()
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if options["blendmode"] == 'multiply' then
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love.graphics.setBlendMode(options["blendmode"], 'premultiplied')
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elseif options["blendmode"] then
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love.graphics.setBlendMode(options["blendmode"])
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end
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if options["shader"] then
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love.graphics.setShader(options["shader"])
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end
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if options["stencil"] then
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love.graphics.stencil(options["stencil"])
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love.graphics.setStencilTest("greater",0)
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end
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if options["istencil"] then
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love.graphics.stencil(options["istencil"])
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love.graphics.setStencilTest("equal", 0)
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end
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if options["color"] then
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love.graphics.setColor(unpack(options["color"]))
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else
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love.graphics.setColor(1,1,1)
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end
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if love.graphics.getCanvas() ~= canvas then
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love.graphics.draw(canvas,0,0)
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end
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if options["blendmode"] then
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love.graphics.setBlendMode("alpha")
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end
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if options["shader"] then
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love.graphics.setShader()
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end
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if options["stencil"] or options["istencil"] then
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--love.graphics.setInvertedStencil()
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love.graphics.setStencilTest()
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end
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end)
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end
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function util.drawto(canvas, x, y, scale, stencil, cb)
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local last_buffer = love.graphics.getCanvas()
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love.graphics.push()
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love.graphics.origin()
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love.graphics.setCanvas({ canvas, stencil = stencil })
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love.graphics.translate(x, y)
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love.graphics.scale(scale)
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cb()
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love.graphics.setCanvas(last_buffer)
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love.graphics.pop()
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end
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function util.loadShader(name)
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local shader = ""
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local externInit = {}
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for line in love.filesystem.lines(name) do
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if line:sub(1,6) == "extern" then
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local type, name = line:match("extern (%w+) (%w+)")
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local value = line:match("=(.*);")
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if value then
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externInit[name] = {type=type, val=value}
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line = line:match("extern %w+ %w+")..";"
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end
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end
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shader = shader.."\n"..line
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end
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local effect = love.graphics.newShader(shader)
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for k, v in pairs(externInit) do
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if v.type == "bool" then
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effect:send(k, v.val)
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elseif v.type == "int" or v.type == "uint" then
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effect:sendInt(k, tonumber(v.val))
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elseif v.type == "float" or v.type == "double" or v.type == "number" then
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effect:send(k, tonumber(v.val))
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elseif v.type:sub(1,3) == "vec" then
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v.val = v.val:gsub(" ", ""):sub(6):sub(1, -2)
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local next = v.val:gmatch("([^,]+)")
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local values = {}
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for n in next do
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table.insert(values, tonumber(n))
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end
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effect:send(k, values)
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end
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end
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return effect
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end
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return util
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