mirror of
https://github.com/tanema/light_world.lua.git
synced 2024-12-24 20:24:19 +00:00
631 lines
18 KiB
Lua
631 lines
18 KiB
Lua
local _PACKAGE = (...):match("^(.+)[%./][^%./]+") or ""
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local class = require(_PACKAGE.."/class")
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local normal_map = require(_PACKAGE..'/normal_map')
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local vector = require(_PACKAGE..'/vector')
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local shadowLength = 100000
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local body = class()
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body.glowShader = love.graphics.newShader(_PACKAGE.."/shaders/glow.glsl")
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body.materialShader = love.graphics.newShader(_PACKAGE.."/shaders/material.glsl")
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function body:init(id, type, ...)
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local args = {...}
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self.id = id
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self.type = type
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self.shine = true
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self.red = 0
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self.green = 0
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self.blue = 0
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self.alpha = 1.0
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self.glowRed = 255
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self.glowGreen = 255
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self.glowBlue = 255
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self.glowStrength = 0.0
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self.tileX = 0
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self.tileY = 0
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if self.type == "circle" then
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self.x = args[1] or 0
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self.y = args[2] or 0
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self:setShadowType('circle', args[3], args[4], args[5])
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elseif self.type == "rectangle" then
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self.x = args[1] or 0
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self.y = args[2] or 0
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self:setShadowType('rectangle', args[3], args[4])
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elseif self.type == "polygon" then
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self:setShadowType('polygon', ...)
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elseif self.type == "image" then
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self.img = args[1]
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self.x = args[2] or 0
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self.y = args[3] or 0
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if self.img then
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self.imgWidth = self.img:getWidth()
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self.imgHeight = self.img:getHeight()
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self.ix = self.imgWidth * 0.5
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self.iy = self.imgHeight * 0.5
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end
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self:setShadowType('rectangle', args[4] or self.imgWidth, args[5] or self.imgHeight, args[6], args[7])
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self.reflective = true
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elseif self.type == "refraction" then
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self:initNormal(...)
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self.refraction = true
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elseif self.type == "reflection" then
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self:initNormal(...)
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self.reflection = true
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end
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end
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function body:initNormal(...)
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local args = {...}
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self.normal = args[1]
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self.x = args[2] or 0
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self.y = args[3] or 0
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if self.normal then
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self.normalWidth = self.normal:getWidth()
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self.normalHeight = self.normal:getHeight()
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self.width = args[4] or self.normalWidth
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self.height = args[5] or self.normalHeight
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self.nx = self.normalWidth * 0.5
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self.ny = self.normalHeight * 0.5
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self.normal:setWrap("repeat", "repeat")
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self.normalVert = {
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{0.0, 0.0, 0.0, 0.0},
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{self.width, 0.0, 1.0, 0.0},
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{self.width, self.height, 1.0, 1.0},
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{0.0, self.height, 0.0, 1.0}
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}
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self.normalMesh = love.graphics.newMesh(self.normalVert, self.normal, "fan")
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else
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self.width = args[4] or 64
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self.height = args[5] or 64
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end
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self.ox = self.width * 0.5
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self.oy = self.height * 0.5
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end
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-- refresh
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function body:refresh()
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if self.x and self.y and self.width and self.height and self.ox and self.oy then
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self.data = {
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self.x - self.ox,
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self.y - self.oy,
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self.x - self.ox + self.width,
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self.y - self.oy,
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self.x - self.ox + self.width,
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self.y - self.oy + self.height,
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self.x - self.ox,
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self.y - self.oy + self.height
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}
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end
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end
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-- set position
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function body:setPosition(x, y)
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if x ~= self.x or y ~= self.y then
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self.x = x
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self.y = y
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self:refresh()
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end
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end
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-- get x position
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function body:getPosition()
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return self.x, self.y
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end
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-- get width
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function body:getWidth()
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return self.width
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end
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-- get height
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function body:getHeight()
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return self.height
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end
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-- get image width
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function body:getImageWidth()
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return self.imgWidth
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end
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-- get image height
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function body:getImageHeight()
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return self.imgHeight
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end
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-- set dimension
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function body:setDimension(width, height)
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self.width = width
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self.height = height
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self:refresh()
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end
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-- set offset
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function body:setOffset(ox, oy)
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if ox ~= self.ox or oy ~= self.oy then
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self.ox = ox
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self.oy = oy
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self:refresh()
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end
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end
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-- set offset
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function body:setImageOffset(ix, iy)
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if ix ~= self.ix or iy ~= self.iy then
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self.ix = ix
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self.iy = iy
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self:refresh()
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end
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end
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-- set offset
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function body:setNormalOffset(nx, ny)
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if nx ~= self.nx or ny ~= self.ny then
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self.nx = nx
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self.ny = ny
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self:refresh()
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end
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end
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-- set glow color
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function body:setGlowColor(red, green, blue)
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self.glowRed = red
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self.glowGreen = green
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self.glowBlue = blue
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end
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-- set glow alpha
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function body:setGlowStrength(strength)
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self.glowStrength = strength
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end
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-- get radius
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function body:getRadius()
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return self.radius
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end
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-- set radius
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function body:setRadius(radius)
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if radius ~= self.radius then
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self.radius = radius
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end
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end
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-- set polygon data
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function body:setPoints(...)
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self.data = {...}
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end
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-- get polygon data
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function body:getPoints()
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return unpack(self.data)
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end
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-- set shadow on/off
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function body:setShadow(b)
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self.castsNoShadow = not b
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end
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-- set shine on/off
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function body:setShine(b)
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self.shine = b
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end
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-- set glass color
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function body:setColor(red, green, blue)
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self.red = red
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self.green = green
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self.blue = blue
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end
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-- set glass alpha
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function body:setAlpha(alpha)
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self.alpha = alpha
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end
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-- set reflection on/off
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function body:setReflection(reflection)
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self.reflection = reflection
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end
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-- set refraction on/off
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function body:setRefraction(refraction)
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self.refraction = refraction
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end
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-- set reflective on other objects on/off
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function body:setReflective(reflective)
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self.reflective = reflective
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end
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-- set refractive on other objects on/off
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function body:setRefractive(refractive)
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self.refractive = refractive
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end
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-- set image
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function body:setImage(img)
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if img then
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self.img = img
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self.imgWidth = self.img:getWidth()
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self.imgHeight = self.img:getHeight()
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self.ix = self.imgWidth * 0.5
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self.iy = self.imgHeight * 0.5
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end
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end
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-- set normal
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function body:setNormalMap(normal, width, height, nx, ny)
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if normal then
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self.normal = normal
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self.normal:setWrap("repeat", "repeat")
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self.normalWidth = width or self.normal:getWidth()
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self.normalHeight = height or self.normal:getHeight()
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self.nx = nx or self.normalWidth * 0.5
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self.ny = ny or self.normalHeight * 0.5
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self.normalVert = {
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{0.0, 0.0, 0.0, 0.0},
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{self.normalWidth, 0.0, self.normalWidth / self.normal:getWidth(), 0.0},
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{self.normalWidth, self.normalHeight, self.normalWidth / self.normal:getWidth(), self.normalHeight / self.normal:getHeight()},
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{0.0, self.normalHeight, 0.0, self.normalHeight / self.normal:getHeight()}
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}
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self.normalMesh = love.graphics.newMesh(self.normalVert, self.normal, "fan")
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else
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self.normalMesh = nil
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end
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end
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-- set height map
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function body:setHeightMap(heightMap, strength)
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self:setNormalMap(normal_map.fromHeightMap(heightMap, strength))
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end
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-- generate flat normal map
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function body:generateNormalMapFlat(mode)
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self:setNormalMap(normal_map.generateFlat(self.img, mode))
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end
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-- generate faded normal map
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function body:generateNormalMapGradient(horizontalGradient, verticalGradient)
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self:setNormalMap(normal_map.generateGradient(self.img, horizontalGradient, verticalGradient))
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end
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-- generate normal map
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function body:generateNormalMap(strength)
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self:setNormalMap(normal_map.fromHeightMap(self.img, strength))
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end
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-- set material
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function body:setMaterial(material)
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if material then
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self.material = material
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end
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end
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-- set normal
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function body:setGlowMap(glow)
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self.glow = glow
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self.glowStrength = 1.0
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end
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-- set tile offset
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function body:setNormalTileOffset(tx, ty)
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self.tileX = tx / self.normalWidth
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self.tileY = ty / self.normalHeight
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self.normalVert = {
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{0.0, 0.0, self.tileX, self.tileY},
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{self.normalWidth, 0.0, self.tileX + 1.0, self.tileY},
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{self.normalWidth, self.normalHeight, self.tileX + 1.0, self.tileY + 1.0},
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{0.0, self.normalHeight, self.tileX, self.tileY + 1.0}
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}
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end
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-- get type
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function body:getType()
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return self.type
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end
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-- get type
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function body:setShadowType(type, ...)
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self.shadowType = type
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local args = {...}
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if self.shadowType == "circle" then
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self.radius = args[1] or 16
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self.ox = args[2] or 0
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self.oy = args[3] or 0
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elseif self.shadowType == "rectangle" then
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self.width = args[1] or 64
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self.height = args[2] or 64
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self.ox = args[3] or self.width * 0.5
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self.oy = args[4] or self.height * 0.5
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self:refresh()
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elseif self.shadowType == "polygon" then
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self.data = args or {0, 0, 0, 0, 0, 0}
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elseif self.shadowType == "image" then
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if self.img then
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self.width = self.imgWidth
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self.height = self.imgHeight
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self.shadowVert = {
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{0.0, 0.0, 0.0, 0.0},
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{self.width, 0.0, 1.0, 0.0},
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{self.width, self.height, 1.0, 1.0},
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{0.0, self.height, 0.0, 1.0}
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}
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if not self.shadowMesh then
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self.shadowMesh = love.graphics.newMesh(self.shadowVert, self.img, "fan")
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self.shadowMesh:setVertexColors(true)
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end
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else
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self.width = 64
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self.height = 64
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end
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self.shadowX = args[1] or 0
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self.shadowY = args[2] or 0
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self.fadeStrength = args[3] or 0.0
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end
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end
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function body:stencil()
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if self.shadowType == "circle" then
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love.graphics.circle("fill", self.x - self.ox, self.y - self.oy, self.radius)
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elseif self.shadowType == "rectangle" then
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love.graphics.rectangle("fill", self.x - self.ox, self.y - self.oy, self.width, self.height)
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elseif self.shadowType == "polygon" then
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love.graphics.polygon("fill", unpack(self.data))
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elseif self.shadowType == "image" then
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--love.graphics.rectangle("fill", self.x - self.ox, self.y - self.oy, self.width, self.height)
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end
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end
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function body:drawShadow(light)
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if self.alpha < 1.0 then
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love.graphics.setBlendMode("multiplicative")
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love.graphics.setColor(self.red, self.green, self.blue)
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if self.shadowType == "circle" then
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love.graphics.circle("fill", self.x - self.ox, self.y - self.oy, self.radius)
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elseif self.shadowType == "rectangle" then
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love.graphics.rectangle("fill", self.x - self.ox, self.y - self.oy, self.width, self.height)
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elseif self.shadowType == "polygon" then
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love.graphics.polygon("fill", unpack(self.data))
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end
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end
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if self.shadowType == "image" and self.img then
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love.graphics.setBlendMode("alpha")
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local length = 1.0
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local shadowRotation = math.atan2((self.x) - light.x, (self.y + self.oy) - light.y)
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self.shadowVert = {
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{
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math.sin(shadowRotation) * self.imgHeight * length,
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(length * math.cos(shadowRotation) + 1.0) * self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
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0, 0,
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self.red,
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self.green,
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self.blue,
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self.alpha * self.fadeStrength * 255
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},
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{
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self.imgWidth + math.sin(shadowRotation) * self.imgHeight * length,
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(length * math.cos(shadowRotation) + 1.0) * self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
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1, 0,
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self.red,
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self.green,
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self.blue,
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self.alpha * self.fadeStrength * 255
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},
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{
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self.imgWidth,
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self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
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1, 1,
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self.red,
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self.green,
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self.blue,
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self.alpha * 255
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},
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{
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0,
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self.imgHeight + (math.cos(shadowRotation) + 1.0) * self.shadowY,
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0, 1,
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self.red,
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self.green,
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self.blue,
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self.alpha * 255
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}
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}
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self.shadowMesh:setVertices(self.shadowVert)
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love.graphics.draw(self.shadowMesh, self.x - self.ox, self.y - self.oy, 0, s, s)
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end
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end
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function body:drawPixelShadow()
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if self.type == "image" and self.normalMesh then
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love.graphics.setColor(255, 255, 255)
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love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
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end
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end
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function body:drawGlow()
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if self.glowStrength > 0.0 then
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love.graphics.setColor(self.glowRed * self.glowStrength, self.glowGreen * self.glowStrength, self.glowBlue * self.glowStrength)
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else
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love.graphics.setColor(0, 0, 0)
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end
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if self.type == "circle" then
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love.graphics.circle("fill", self.x, self.y, self.radius)
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elseif self.type == "rectangle" then
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love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
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elseif self.type == "polygon" then
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love.graphics.polygon("fill", unpack(self.data))
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elseif self.type == "image" and self.img then
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if self.glowStrength > 0.0 and self.glow then
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love.graphics.setShader(self.glowShader)
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self.glowShader:send("glowImage", self.glow)
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self.glowShader:send("glowTime", love.timer.getTime() * 0.5)
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love.graphics.setColor(255, 255, 255)
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else
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love.graphics.setShader()
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love.graphics.setColor(0, 0, 0)
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end
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love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
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end
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love.graphics.setShader()
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end
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function body:drawRefraction()
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if self.refraction and self.normal then
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love.graphics.setColor(255, 255, 255)
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if self.tileX == 0.0 and self.tileY == 0.0 then
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love.graphics.draw(normal, self.x - self.nx, self.y - self.ny)
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else
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self.normalMesh:setVertices(self.normalVert)
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love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
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end
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end
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love.graphics.setColor(0, 0, 0)
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if not self.refractive then
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if self.type == "circle" then
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love.graphics.circle("fill", self.x, self.y, self.radius)
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elseif self.type == "rectangle" then
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love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
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elseif self.type == "polygon" then
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love.graphics.polygon("fill", unpack(self.data))
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elseif self.type == "image" and self.img then
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love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
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end
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end
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end
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function body:drawReflection()
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if self.reflection and self.normal then
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love.graphics.setColor(255, 0, 0)
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self.normalMesh:setVertices(self.normalVert)
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love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
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end
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if self.reflective and self.img then
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love.graphics.setColor(0, 255, 0)
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love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
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elseif not self.reflection and self.img then
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love.graphics.setColor(0, 0, 0)
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love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
|
|
end
|
|
end
|
|
|
|
function body:drawMaterial()
|
|
if self.material and self.normal then
|
|
love.graphics.setShader(self.materialShader)
|
|
love.graphics.setColor(255, 255, 255)
|
|
self.materialShader:send("material", self.material)
|
|
love.graphics.draw(self.normal, self.x - self.nx, self.y - self.ny)
|
|
love.graphics.setShader()
|
|
end
|
|
end
|
|
|
|
function body:calculateShadow(light)
|
|
if self.shadowType == "rectangle" or self.shadowType == "polygon" then
|
|
return self:calculatePolyShadow(light)
|
|
elseif self.shadowType == "circle" then
|
|
return self:calculateCircleShadow(light)
|
|
end
|
|
end
|
|
|
|
function body:calculatePolyShadow(light)
|
|
if self.castsNoShadow then
|
|
return nil
|
|
end
|
|
|
|
local curPolygon = self.data
|
|
local edgeFacingTo = {}
|
|
for k = 1, #curPolygon, 2 do
|
|
local indexOfNextVertex = (k + 2) % #curPolygon
|
|
local normal = {-curPolygon[indexOfNextVertex+1] + curPolygon[k + 1], curPolygon[indexOfNextVertex] - curPolygon[k]}
|
|
local lightToPoint = {curPolygon[k] - light.x, curPolygon[k + 1] - light.y}
|
|
|
|
normal = vector.normalize(normal)
|
|
lightToPoint = vector.normalize(lightToPoint)
|
|
|
|
local dotProduct = vector.dot(normal, lightToPoint)
|
|
if dotProduct > 0 then table.insert(edgeFacingTo, true)
|
|
else table.insert(edgeFacingTo, false) end
|
|
end
|
|
|
|
local curShadowGeometry = {}
|
|
for k = 1, #edgeFacingTo do
|
|
local nextIndex = (k + 1) % #edgeFacingTo
|
|
if nextIndex == 0 then nextIndex = #edgeFacingTo end
|
|
if edgeFacingTo[k] and not edgeFacingTo[nextIndex] then
|
|
curShadowGeometry[1] = curPolygon[nextIndex*2-1]
|
|
curShadowGeometry[2] = curPolygon[nextIndex*2]
|
|
|
|
local lightVecFrontBack = vector.normalize({curPolygon[nextIndex*2-1] - light.x, curPolygon[nextIndex*2] - light.y})
|
|
curShadowGeometry[3] = curShadowGeometry[1] + lightVecFrontBack[1] * shadowLength
|
|
curShadowGeometry[4] = curShadowGeometry[2] + lightVecFrontBack[2] * shadowLength
|
|
|
|
elseif not edgeFacingTo[k] and edgeFacingTo[nextIndex] then
|
|
curShadowGeometry[7] = curPolygon[nextIndex*2-1]
|
|
curShadowGeometry[8] = curPolygon[nextIndex*2]
|
|
|
|
local lightVecBackFront = vector.normalize({curPolygon[nextIndex*2-1] - light.x, curPolygon[nextIndex*2] - light.y})
|
|
curShadowGeometry[5] = curShadowGeometry[7] + lightVecBackFront[1] * shadowLength
|
|
curShadowGeometry[6] = curShadowGeometry[8] + lightVecBackFront[2] * shadowLength
|
|
end
|
|
end
|
|
if curShadowGeometry[1]
|
|
and curShadowGeometry[2]
|
|
and curShadowGeometry[3]
|
|
and curShadowGeometry[4]
|
|
and curShadowGeometry[5]
|
|
and curShadowGeometry[6]
|
|
and curShadowGeometry[7]
|
|
and curShadowGeometry[8]
|
|
then
|
|
curShadowGeometry.alpha = self.alpha
|
|
curShadowGeometry.red = self.red
|
|
curShadowGeometry.green = self.green
|
|
curShadowGeometry.blue = self.blue
|
|
return curShadowGeometry
|
|
else
|
|
return nil
|
|
end
|
|
end
|
|
|
|
function body:calculateCircleShadow(light)
|
|
if self.castsNoShadow then
|
|
return nil
|
|
end
|
|
local length = math.sqrt(math.pow(light.x - (self.x - self.ox), 2) + math.pow(light.y - (self.y - self.oy), 2))
|
|
if length >= self.radius and length <= light.range then
|
|
local curShadowGeometry = {}
|
|
local angle = math.atan2(light.x - (self.x - self.ox), (self.y - self.oy) - light.y) + math.pi / 2
|
|
local x2 = ((self.x - self.ox) + math.sin(angle) * self.radius)
|
|
local y2 = ((self.y - self.oy) - math.cos(angle) * self.radius)
|
|
local x3 = ((self.x - self.ox) - math.sin(angle) * self.radius)
|
|
local y3 = ((self.y - self.oy) + math.cos(angle) * self.radius)
|
|
|
|
curShadowGeometry[1] = x2
|
|
curShadowGeometry[2] = y2
|
|
curShadowGeometry[3] = x3
|
|
curShadowGeometry[4] = y3
|
|
|
|
curShadowGeometry[5] = x3 - (light.x - x3) * shadowLength
|
|
curShadowGeometry[6] = y3 - (light.y - y3) * shadowLength
|
|
curShadowGeometry[7] = x2 - (light.x - x2) * shadowLength
|
|
curShadowGeometry[8] = y2 - (light.y - y2) * shadowLength
|
|
curShadowGeometry.alpha = self.alpha
|
|
curShadowGeometry.red = self.red
|
|
curShadowGeometry.green = self.green
|
|
curShadowGeometry.blue = self.blue
|
|
return curShadowGeometry
|
|
else
|
|
return nil
|
|
end
|
|
end
|
|
|
|
return body
|