light_world.lua/light.lua

LOVE_LIGHT_CURRENT = nil
LOVE_LIGHT_CIRCLE = nil
LOVE_LIGHT_POLY = nil
LOVE_LIGHT_IMAGE = nil
LOVE_LIGHT_BODY = nil
LOVE_LIGHT_LAST_BUFFER = nil
LOVE_LIGHT_SHADOW_GEOMETRY = nil

LOVE_LIGHT_BLURV = love.graphics.newShader("shader/blurv.glsl")
LOVE_LIGHT_BLURH = love.graphics.newShader("shader/blurh.glsl")
LOVE_LIGHT_BLURV:send("screen", {love.window.getWidth(), love.window.getHeight()})
LOVE_LIGHT_BLURH:send("screen", {love.window.getWidth(), love.window.getHeight()})

LOVE_LIGHT_TRANSLATE_X = 0
LOVE_LIGHT_TRANSLATE_Y = 0
LOVE_LIGHT_TRANSLATE_X_OLD = 0
LOVE_LIGHT_TRANSLATE_Y_OLD = 0
LOVE_LIGHT_DIRECTION = 0
love.light = {}

-- light world
function love.light.newWorld()
	local o = {}
	o.lights = {}
	o.ambient = {0, 0, 0}
	o.circle = {}
	o.poly = {}
	o.img = {}
	o.body = {}
	o.refraction = {}
	o.shadow = love.graphics.newCanvas()
	o.shadow2 = love.graphics.newCanvas()
	o.shine = love.graphics.newCanvas()
	o.shine2 = love.graphics.newCanvas()
	o.normalMap = love.graphics.newCanvas()
	o.glowMap = love.graphics.newCanvas()
	o.glowMap2 = love.graphics.newCanvas()
	o.refractionMap = love.graphics.newCanvas()
	o.refractionMap2 = love.graphics.newCanvas()
	o.reflectionMap = love.graphics.newCanvas()
	o.reflectionMap2 = love.graphics.newCanvas()
	o.glowBlur = 1.0
	o.isGlowBlur = false
	o.glowTimer = 0.0
	o.glowDown = false
	o.refractionStrength = 8.0
	o.pixelShadow = love.graphics.newCanvas()
	o.pixelShadow2 = love.graphics.newCanvas()
	o.shader = love.graphics.newShader("shader/poly_shadow.glsl")
	o.glowShader = love.graphics.newShader("shader/glow.glsl")
	o.normalShader = love.graphics.newShader("shader/normal.glsl")
	o.refractionShader = love.graphics.newShader("shader/refraction.glsl")
	o.refractionShader:send("screen", {love.window.getWidth(), love.window.getHeight()})
	o.reflectionShader = love.graphics.newShader("shader/reflection.glsl")
	o.reflectionShader:send("screen", {love.window.getWidth(), love.window.getHeight()})
	o.reflectionStrength = 16.0
	o.reflectionVisibility = 1.0
	o.changed = true
	o.blur = 2.0
	-- update
	o.update = function()
		LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
		love.graphics.setShader(o.shader)

		if LOVE_LIGHT_TRANSLATE_X ~= LOVE_LIGHT_TRANSLATE_X_OLD or LOVE_LIGHT_TRANSLATE_Y ~= LOVE_LIGHT_TRANSLATE_Y_OLD then
			LOVE_LIGHT_TRANSLATE_X_OLD = LOVE_LIGHT_TRANSLATE_X
			LOVE_LIGHT_TRANSLATE_Y_OLD = LOVE_LIGHT_TRANSLATE_Y
			o.changed = true
		end

		love.graphics.setColor(255, 255, 255)
		love.graphics.setBlendMode("alpha")

		local lightsOnScreen = 0
		LOVE_LIGHT_CIRCLE = o.circle
		LOVE_LIGHT_POLY = o.poly
		LOVE_LIGHT_IMAGE = o.img
		LOVE_LIGHT_BODY = o.body
		for i = 1, #o.lights do
			if o.lights[i].changed or o.changed then
				if  o.lights[i].x + o.lights[i].range > LOVE_LIGHT_TRANSLATE_X and o.lights[i].x - o.lights[i].range < love.graphics.getWidth() + LOVE_LIGHT_TRANSLATE_X
				and o.lights[i].y + o.lights[i].range > LOVE_LIGHT_TRANSLATE_Y and o.lights[i].y - o.lights[i].range < love.graphics.getHeight() + LOVE_LIGHT_TRANSLATE_Y
				then
					local lightposrange = {o.lights[i].x, love.graphics.getHeight() - o.lights[i].y, o.lights[i].range}
					LOVE_LIGHT_CURRENT = o.lights[i]
					LOVE_LIGHT_DIRECTION = LOVE_LIGHT_DIRECTION + 0.002
					o.shader:send("lightPosition", {o.lights[i].x - LOVE_LIGHT_TRANSLATE_X, love.graphics.getHeight() - (o.lights[i].y - LOVE_LIGHT_TRANSLATE_Y)})
					o.shader:send("lightRange", o.lights[i].range)
					o.shader:send("lightColor", {o.lights[i].red / 255.0, o.lights[i].green / 255.0, o.lights[i].blue / 255.0})
					o.shader:send("lightSmooth", o.lights[i].smooth)
					o.shader:send("lightGlow", {1.0 - o.lights[i].glowSize, o.lights[i].glowStrength})
					o.shader:send("lightAngle", math.pi - o.lights[i].angle / 2.0)
					o.shader:send("lightDirection", o.lights[i].direction)

					love.graphics.setCanvas(o.lights[i].shadow)
					love.graphics.clear()

					-- calculate shadows
					LOVE_LIGHT_SHADOW_GEOMETRY = calculateShadows(LOVE_LIGHT_CURRENT, LOVE_LIGHT_BODY)

					-- draw shadow
					love.graphics.setInvertedStencil(shadowStencil)
					love.graphics.setBlendMode("additive")
					love.graphics.rectangle("fill", LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y, love.graphics.getWidth(), love.graphics.getHeight())

					-- draw color shadows
					love.graphics.setBlendMode("multiplicative")
					love.graphics.setShader()
					for k = 1,#LOVE_LIGHT_SHADOW_GEOMETRY do
						if LOVE_LIGHT_SHADOW_GEOMETRY[k].alpha < 1.0 then
							love.graphics.setColor(
								LOVE_LIGHT_SHADOW_GEOMETRY[k].red * (1.0 - LOVE_LIGHT_SHADOW_GEOMETRY[k].alpha),
								LOVE_LIGHT_SHADOW_GEOMETRY[k].green * (1.0 - LOVE_LIGHT_SHADOW_GEOMETRY[k].alpha),
								LOVE_LIGHT_SHADOW_GEOMETRY[k].blue * (1.0 - LOVE_LIGHT_SHADOW_GEOMETRY[k].alpha)
							)
							love.graphics.polygon("fill", unpack(LOVE_LIGHT_SHADOW_GEOMETRY[k]))
						end
					end

					for k = 1, #LOVE_LIGHT_BODY do
						if LOVE_LIGHT_BODY[k].alpha < 1.0 then
							love.graphics.setBlendMode("multiplicative")
							love.graphics.setColor(LOVE_LIGHT_BODY[k].red, LOVE_LIGHT_BODY[k].green, LOVE_LIGHT_BODY[k].blue)
							if LOVE_LIGHT_BODY[k].shadowType == "circle" then
								love.graphics.circle("fill", LOVE_LIGHT_BODY[k].x - LOVE_LIGHT_BODY[k].ox, LOVE_LIGHT_BODY[k].y - LOVE_LIGHT_BODY[k].oy, LOVE_LIGHT_BODY[k].radius)
							elseif LOVE_LIGHT_BODY[k].shadowType == "rectangle" then
								love.graphics.rectangle("fill", LOVE_LIGHT_BODY[k].x - LOVE_LIGHT_BODY[k].ox, LOVE_LIGHT_BODY[k].y - LOVE_LIGHT_BODY[k].oy, LOVE_LIGHT_BODY[k].width, LOVE_LIGHT_BODY[k].height)
							elseif LOVE_LIGHT_BODY[k].shadowType == "polygon" then
								love.graphics.polygon("fill", unpack(LOVE_LIGHT_BODY[k].data))
							end
						end
						if LOVE_LIGHT_BODY[k].shadowType == "image" and LOVE_LIGHT_BODY[k].img then
							love.graphics.setBlendMode("alpha")
							local length = 1.0
							local shadowRotation = math.atan2((LOVE_LIGHT_BODY[k].x) - o.lights[i].x, (LOVE_LIGHT_BODY[k].y + LOVE_LIGHT_BODY[k].oy) - o.lights[i].y)
							--local alpha = math.abs(math.cos(shadowRotation))

							LOVE_LIGHT_BODY[k].shadowVert = {
								{math.sin(shadowRotation) * LOVE_LIGHT_BODY[k].imgHeight * length, (length * math.cos(shadowRotation) + 1.0) * LOVE_LIGHT_BODY[k].imgHeight + (math.cos(shadowRotation) + 1.0) * LOVE_LIGHT_BODY[k].shadowY, 0, 0, LOVE_LIGHT_BODY[k].red, LOVE_LIGHT_BODY[k].green, LOVE_LIGHT_BODY[k].blue, LOVE_LIGHT_BODY[k].alpha * LOVE_LIGHT_BODY[k].fadeStrength * 255},
								{LOVE_LIGHT_BODY[k].imgWidth + math.sin(shadowRotation) * LOVE_LIGHT_BODY[k].imgHeight * length, (length * math.cos(shadowRotation) + 1.0) * LOVE_LIGHT_BODY[k].imgHeight + (math.cos(shadowRotation) + 1.0) * LOVE_LIGHT_BODY[k].shadowY, 1, 0, LOVE_LIGHT_BODY[k].red, LOVE_LIGHT_BODY[k].green, LOVE_LIGHT_BODY[k].blue, LOVE_LIGHT_BODY[k].alpha * LOVE_LIGHT_BODY[k].fadeStrength * 255},
								{LOVE_LIGHT_BODY[k].imgWidth, LOVE_LIGHT_BODY[k].imgHeight + (math.cos(shadowRotation) + 1.0) * LOVE_LIGHT_BODY[k].shadowY, 1, 1, LOVE_LIGHT_BODY[k].red, LOVE_LIGHT_BODY[k].green, LOVE_LIGHT_BODY[k].blue, LOVE_LIGHT_BODY[k].alpha * 255},
								{0, LOVE_LIGHT_BODY[k].imgHeight + (math.cos(shadowRotation) + 1.0) * LOVE_LIGHT_BODY[k].shadowY, 0, 1, LOVE_LIGHT_BODY[k].red, LOVE_LIGHT_BODY[k].green, LOVE_LIGHT_BODY[k].blue, LOVE_LIGHT_BODY[k].alpha * 255}
							}

							LOVE_LIGHT_BODY[k].shadowMesh:setVertices(LOVE_LIGHT_BODY[k].shadowVert)
							love.graphics.draw(LOVE_LIGHT_BODY[k].shadowMesh, LOVE_LIGHT_BODY[k].x - LOVE_LIGHT_BODY[k].ox + LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_BODY[k].y - LOVE_LIGHT_BODY[k].oy + LOVE_LIGHT_TRANSLATE_Y)
						end
					end

					love.graphics.setShader(o.shader)

					-- draw shine
					love.graphics.setCanvas(o.lights[i].shine)
					o.lights[i].shine:clear(255, 255, 255)
					love.graphics.setBlendMode("alpha")
					love.graphics.setStencil(polyStencil)
					love.graphics.rectangle("fill", LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y, love.graphics.getWidth(), love.graphics.getHeight())

					lightsOnScreen = lightsOnScreen + 1

					o.lights[i].visible = true
				else
					o.lights[i].visible = false
				end

				o.lights[i].changed = o.changed
			end
		end

		-- update shadow
		love.graphics.setShader()
		love.graphics.setCanvas(o.shadow)
		love.graphics.setStencil()
		love.graphics.setColor(unpack(o.ambient))
		love.graphics.setBlendMode("alpha")
		love.graphics.rectangle("fill", LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y, love.graphics.getWidth(), love.graphics.getHeight())
		love.graphics.setColor(255, 255, 255)
		love.graphics.setBlendMode("additive")
		for i = 1, #o.lights do
			if o.lights[i].visible then
				love.graphics.draw(o.lights[i].shadow, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			end
		end
		o.isShadowBlur = false

		-- update shine
		love.graphics.setCanvas(o.shine)
		love.graphics.setColor(unpack(o.ambient))
		love.graphics.setBlendMode("alpha")
		love.graphics.rectangle("fill", 0, 0, love.graphics.getWidth(), love.graphics.getHeight())
		love.graphics.setColor(255, 255, 255)
		love.graphics.setBlendMode("additive")
		for i = 1, #o.lights do
			if o.lights[i].visible then
				love.graphics.draw(o.lights[i].shine, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			end
		end

		-- update pixel shadow
		love.graphics.setBlendMode("alpha")

		-- create normal map
		o.normalMap:clear()
		love.graphics.setShader()
		love.graphics.setCanvas(o.normalMap)
		for i = 1, #o.body do
			if o.body[i].type == "image" and o.body[i].normal then
				love.graphics.setColor(255, 255, 255)
				love.graphics.draw(o.body[i].normal, o.body[i].x - o.body[i].nx + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].ny + LOVE_LIGHT_TRANSLATE_Y)
			end
		end
		love.graphics.setColor(255, 255, 255)
		love.graphics.setBlendMode("alpha")

		o.pixelShadow2:clear()
		love.graphics.setCanvas(o.pixelShadow2)
		love.graphics.setBlendMode("additive")
		love.graphics.setShader(o.shader2)

		for i = 1, #o.lights do
			if o.lights[i].visible then
				o.normalShader:send('screenResolution', {love.graphics.getWidth(), love.graphics.getHeight()})
				o.normalShader:send('lightColor', {o.lights[i].red / 255.0, o.lights[i].green / 255.0, o.lights[i].blue / 255.0})
				o.normalShader:send('lightPosition',{o.lights[i].x, love.graphics.getHeight() - o.lights[i].y, o.lights[i].z / 255.0})
				o.normalShader:send('lightRange',{o.lights[i].range})
				o.normalShader:send("lightSmooth", o.lights[i].smooth)
				o.normalShader:send("lightAngle", math.pi - o.lights[i].angle / 2.0)
				o.normalShader:send("lightDirection", o.lights[i].direction)
				love.graphics.setShader(o.normalShader)
				love.graphics.draw(o.normalMap, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			end
		end

		love.graphics.setShader()
		o.pixelShadow:clear(255, 255, 255)
		love.graphics.setCanvas(o.pixelShadow)
		love.graphics.setBlendMode("alpha")
		love.graphics.draw(o.pixelShadow2, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
		love.graphics.setBlendMode("additive")
		love.graphics.setColor({o.ambient[1], o.ambient[2], o.ambient[3]})
		love.graphics.rectangle("fill", LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y, love.graphics.getWidth(), love.graphics.getHeight())
		love.graphics.setBlendMode("alpha")

		-- create glow map
		o.glowMap:clear(0, 0, 0)
		love.graphics.setCanvas(o.glowMap)

		if o.glowDown then
			o.glowTimer = math.max(0.0, o.glowTimer - love.timer.getDelta())
			if o.glowTimer == 0.0 then
				o.glowDown = not o.glowDown
			end
		else
			o.glowTimer = math.min(o.glowTimer + love.timer.getDelta(), 1.0)
			if o.glowTimer == 1.0 then
				o.glowDown = not o.glowDown
			end
		end

		for i = 1, #o.body do
			if o.body[i].glowStrength > 0.0 then
				love.graphics.setColor(o.body[i].glowRed * o.body[i].glowStrength, o.body[i].glowGreen * o.body[i].glowStrength, o.body[i].glowBlue * o.body[i].glowStrength)
			else
				love.graphics.setColor(0, 0, 0)
			end

			if o.body[i].type == "circle" then
				love.graphics.circle("fill", o.body[i].x, o.body[i].y, o.body[i].radius)
			elseif o.body[i].type == "rectangle" then
				love.graphics.rectangle("fill", o.body[i].x, o.body[i].y, o.body[i].width, o.body[i].height)
			elseif o.body[i].type == "polygon" then
				love.graphics.polygon("fill", unpack(o.body[i].data))
			elseif o.body[i].type == "image" and o.body[i].img then
				if o.body[i].glowStrength > 0.0 and o.body[i].glow then
					love.graphics.setShader(o.glowShader)
					o.glowShader:send("glowImage", o.body[i].glow)
					o.glowShader:send("glowTime", love.timer.getTime())
					love.graphics.setColor(255, 255, 255)
				else
					love.graphics.setShader()
					love.graphics.setColor(0, 0, 0)
				end
				love.graphics.draw(o.body[i].img, o.body[i].x - o.body[i].ix + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].iy + LOVE_LIGHT_TRANSLATE_Y)
			end
		end

		love.graphics.setShader()
		o.isGlowBlur = false

		-- create refraction map
		o.refractionMap:clear()
		love.graphics.setCanvas(o.refractionMap)
		for i = 1, #o.body do
			if o.body[i].refraction and o.body[i].normal then
				love.graphics.setColor(255, 255, 255)
				if o.body[i].tileX == 0.0 and o.body[i].tileY == 0.0 then
					love.graphics.draw(normal, o.body[i].x - o.body[i].nx + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].ny + LOVE_LIGHT_TRANSLATE_Y)
				else
					o.body[i].normalMesh:setVertices(o.body[i].normalVert)
					love.graphics.draw(o.body[i].normalMesh, o.body[i].x - o.body[i].nx + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].ny + LOVE_LIGHT_TRANSLATE_Y)
				end
			end
		end

		love.graphics.setBlendMode("replace")
		love.graphics.setColor(0, 0, 0, 0)
		for i = 1, #o.body do
			if not o.body[i].refractive then
				if o.body[i].type == "circle" then
					love.graphics.circle("fill", o.body[i].x, o.body[i].y, o.body[i].radius)
				elseif o.body[i].type == "rectangle" then
					love.graphics.rectangle("fill", o.body[i].x, o.body[i].y, o.body[i].width, o.body[i].height)
				elseif o.body[i].type == "polygon" then
					love.graphics.polygon("fill", unpack(o.body[i].data))
				elseif o.body[i].type == "image" and o.body[i].img then
					love.graphics.draw(o.body[i].img, o.body[i].x - o.body[i].ix + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].iy + LOVE_LIGHT_TRANSLATE_Y)
				end
			end
		end

		-- create reflection map
		love.graphics.setBlendMode("alpha")
		if o.changed then
			o.reflectionMap:clear(0, 0, 0)
			love.graphics.setCanvas(o.reflectionMap)
			for i = 1, #o.body do
				if o.body[i].reflection and o.body[i].normal then
					love.graphics.setColor(255, 0, 0)
					o.body[i].normalMesh:setVertices(o.body[i].normalVert)
					love.graphics.draw(o.body[i].normalMesh, o.body[i].x - o.body[i].nx + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].ny + LOVE_LIGHT_TRANSLATE_Y)
				end
			end
			for i = 1, #o.body do
				if o.body[i].reflective and o.body[i].img then
					love.graphics.setColor(0, 255, 0)
					love.graphics.draw(o.body[i].img, o.body[i].x - o.body[i].ix + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].iy + LOVE_LIGHT_TRANSLATE_Y)
				elseif not o.body[i].reflection and o.body[i].img then
					love.graphics.setColor(0, 0, 0)
					love.graphics.draw(o.body[i].img, o.body[i].x - o.body[i].ix + LOVE_LIGHT_TRANSLATE_X, o.body[i].y - o.body[i].iy + LOVE_LIGHT_TRANSLATE_Y)
				end
			end
		end

		love.graphics.setShader()
		love.graphics.setBlendMode("alpha")
		love.graphics.setStencil()
		love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)

		o.changed = false
	end
	-- draw shadow
	o.drawShadow = function()
		love.graphics.setColor(255, 255, 255)
		if o.blur then
			LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
			LOVE_LIGHT_BLURV:send("steps", o.blur)
			LOVE_LIGHT_BLURH:send("steps", o.blur)
			love.graphics.setBlendMode("alpha")
			love.graphics.setCanvas(o.shadow2)
			love.graphics.setShader(LOVE_LIGHT_BLURV)
			love.graphics.draw(o.shadow, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(o.shadow)
			love.graphics.setShader(LOVE_LIGHT_BLURH)
			love.graphics.draw(o.shadow2, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)
			love.graphics.setBlendMode("multiplicative")
			love.graphics.setShader()
			love.graphics.draw(o.shadow, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setBlendMode("alpha")
		else
			love.graphics.setBlendMode("multiplicative")
			love.graphics.setShader()
			love.graphics.draw(o.shadow, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setBlendMode("alpha")
		end
	end
	-- draw shine
	o.drawShine = function()
		love.graphics.setColor(255, 255, 255)
		if o.blur and false then
			LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
			LOVE_LIGHT_BLURV:send("steps", o.blur)
			LOVE_LIGHT_BLURH:send("steps", o.blur)
			love.graphics.setBlendMode("alpha")
			love.graphics.setCanvas(o.shine2)
			love.graphics.setShader(LOVE_LIGHT_BLURV)
			love.graphics.draw(o.shine, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(o.shine)
			love.graphics.setShader(LOVE_LIGHT_BLURH)
			love.graphics.draw(o.shine2, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)
			love.graphics.setBlendMode("multiplicative")
			love.graphics.setShader()
			love.graphics.draw(o.shine, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setBlendMode("alpha")
		else
			love.graphics.setBlendMode("multiplicative")
			love.graphics.setShader()
			love.graphics.draw(o.shine, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setBlendMode("alpha")
		end
	end
	-- draw pixel shadow
	o.drawPixelShadow = function()
		love.graphics.setColor(255, 255, 255)
		love.graphics.setBlendMode("multiplicative")
		love.graphics.setShader()
		love.graphics.draw(o.pixelShadow, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
		love.graphics.setBlendMode("alpha")
	end
	-- draw glow
	o.drawGlow = function()
		love.graphics.setColor(255, 255, 255)
		if o.isGlowBlur or o.glowBlur == 0.0 then
			love.graphics.setBlendMode("additive")
			love.graphics.setShader()
			love.graphics.draw(o.glowMap, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setBlendMode("alpha")
		else
			LOVE_LIGHT_BLURV:send("steps", o.glowBlur)
			LOVE_LIGHT_BLURH:send("steps", o.glowBlur)
			LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
			love.graphics.setBlendMode("additive")
			o.glowMap2:clear()
			love.graphics.setCanvas(o.glowMap2)
			love.graphics.setShader(LOVE_LIGHT_BLURV)
			love.graphics.draw(o.glowMap, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(o.glowMap)
			love.graphics.setShader(LOVE_LIGHT_BLURH)
			love.graphics.draw(o.glowMap2, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)
			--love.graphics.setBlendMode("additive")
			love.graphics.setShader()
			love.graphics.draw(o.glowMap, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setBlendMode("alpha")

			o.isGlowBlur = true
		end
	end
	-- draw refraction
	o.drawRefraction = function()
		LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
		if LOVE_LIGHT_LAST_BUFFER then
			love.graphics.setColor(255, 255, 255)
			love.graphics.setBlendMode("alpha")
			love.graphics.setCanvas(o.refractionMap2)
			love.graphics.draw(LOVE_LIGHT_LAST_BUFFER, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)
			o.refractionShader:send("backBuffer", o.refractionMap2)
			o.refractionShader:send("refractionStrength", o.refractionStrength)
			love.graphics.setShader(o.refractionShader)
			love.graphics.draw(o.refractionMap, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setShader()
		end
	end
	-- draw reflection
	o.drawReflection = function()
		LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
		if LOVE_LIGHT_LAST_BUFFER then
			love.graphics.setColor(255, 255, 255)
			love.graphics.setBlendMode("alpha")
			love.graphics.setCanvas(o.reflectionMap2)
			love.graphics.draw(LOVE_LIGHT_LAST_BUFFER, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)
			o.reflectionShader:send("backBuffer", o.reflectionMap2)
			o.reflectionShader:send("reflectionStrength", o.reflectionStrength)
			o.reflectionShader:send("reflectionVisibility", o.reflectionVisibility)
			love.graphics.setShader(o.reflectionShader)
			love.graphics.draw(o.reflectionMap, LOVE_LIGHT_TRANSLATE_X, LOVE_LIGHT_TRANSLATE_Y)
			love.graphics.setShader()
		end
	end
	-- new light
	o.newLight = function(x, y, red, green, blue, range)
		o.lights[#o.lights + 1] = love.light.newLight(o, x, y, red, green, blue, range)

		return o.lights[#o.lights]
	end
	-- clear lights
	o.clearLights = function()
		o.lights = {}
		o.changed = true
	end
	-- clear objects
	o.clearBodys = function()
		o.body = {}
		o.changed = true
	end
	-- set offset
	o.setTranslation = function(translateX, translateY)
		LOVE_LIGHT_TRANSLATE_X = translateX
		LOVE_LIGHT_TRANSLATE_Y = translateY
	end
	-- set ambient color
	o.setAmbientColor = function(red, green, blue)
		o.ambient = {red, green, blue}
	end
	-- set ambient red
	o.setAmbientRed = function(red)
		o.ambient[1] = red
	end
	-- set ambient green
	o.setAmbientGreen = function(green)
		o.ambient[2] = green
	end
	-- set ambient blue
	o.setAmbientBlue = function(blue)
		o.ambient[3] = blue
	end
	-- set blur
	o.setBlur = function(blur)
		o.blur = blur
		o.changed = true
	end
	-- set blur
	o.setShadowBlur = function(blur)
		o.blur = blur
		o.changed = true
	end
	-- set glow blur
	o.setGlowStrength = function(strength)
		o.glowBlur = strength
		o.changed = true
	end
	-- set refraction blur
	o.setRefractionStrength = function(strength)
		o.refractionStrength = strength
	end
	-- set reflection strength
	o.setReflectionStrength = function(strength)
		o.reflectionStrength = strength
	end
	-- set reflection visibility
	o.setReflectionVisibility = function(visibility)
		o.reflectionVisibility = visibility
	end
	-- new rectangle
	o.newRectangle = function(x, y, w, h)
		return love.light.newRectangle(o, x, y, w, h)
	end
	-- new circle
	o.newCircle = function(x, y, r)
		return love.light.newCircle(o, x, y, r)
	end
	-- new polygon
	o.newPolygon = function(...)
		return love.light.newPolygon(o, ...)
	end
	-- new image
	o.newImage = function(img, x, y, width, height, ox, oy)
		return love.light.newImage(o, img, x, y, width, height, ox, oy)
	end
	-- new refraction
	o.newRefraction = function(normal, x, y)
		return love.light.newRefraction(o, normal, x, y)
	end
	-- new refraction from height map
	o.newRefractionHeightMap = function(heightMap, x, y, strength)
		return love.light.newRefractionHeightMap(o, heightMap, x, y, strength)
	end
	-- new body
	o.newBody = function(type, ...)
		return love.light.newBody(o, type, ...)
	end
	-- set polygon data
	o.setPoints = function(n, ...)
		o.body[n].data = {...}
	end
	-- get polygon count
	o.getBodyCount = function()
		return #o.body
	end
	-- get polygon
	o.getPoints = function(n)
		if o.body[n].data then
			return unpack(o.body[n].data)
		end
	end
	-- set light position
	o.setLightPosition = function(n, x, y)
		o.lights[n].setPosition(x, y)
	end
	-- set light x
	o.setLightX = function(n, x)
		o.lights[n].setX(x)
	end
	-- set light y
	o.setLightY = function(n, y)
		o.lights[n].setY(y)
	end
	-- set light angle
	o.setLightAngle = function(n, angle)
		o.lights[n].setAngle(angle)
	end
	-- set light direction
	o.setLightDirection = function(n, direction)
		o.lights[n].setDirection(direction)
	end
	-- get light count
	o.getLightCount = function()
		return #o.lights
	end
	-- get light x position
	o.getLightX = function(n)
		return o.lights[n].x
	end
	-- get light y position
	o.getLightY = function(n)
		return o.lights[n].y
	end
	-- get type
	o.getType = function()
		return "world"
	end

	return o
end

-- light object
function love.light.newLight(p, x, y, red, green, blue, range)
	local o = {}
	o.direction = 0
	o.angle = math.pi * 2.0
	o.range = 0
	o.shadow = love.graphics.newCanvas()
	o.shine = love.graphics.newCanvas()
	o.x = x or 0
	o.y = y or 0
	o.z = 15
	o.red = red or 255
	o.green = green or 255
	o.blue = blue or 255
	o.range = range or 300
	o.smooth = 1.0
	o.glowSize = 0.1
	o.glowStrength = 0.0
	o.changed = true
	o.visible = true
	-- set position
	o.setPosition = function(x, y)
		if x ~= o.x or y ~= o.y then
			o.x = x
			o.y = y
			o.changed = true
		end
	end
	-- get x
	o.getX = function()
		return o.x
	end
	-- get y
	o.getY = function()
		return o.y
	end
	-- set x
	o.setX = function(x)
		if x ~= o.x then
			o.x = x
			o.changed = true
		end
	end
	-- set y
	o.setY = function(y)
		if y ~= o.y then
			o.y = y
			o.changed = true
		end
	end
	-- set color
	o.setColor = function(red, green, blue)
		o.red = red
		o.green = green
		o.blue = blue
		--p.changed = true
	end
	-- set range
	o.setRange = function(range)
		if range ~= o.range then
			o.range = range
			o.changed = true
		end
	end
	-- set direction
	o.setDirection = function(direction)
		if direction ~= o.direction then
			if direction > math.pi * 2 then
				o.direction = math.mod(direction, math.pi * 2)
			elseif direction < 0.0 then
				o.direction = math.pi * 2 - math.mod(math.abs(direction), math.pi * 2)
			else
				o.direction = direction
			end
			o.changed = true
		end
	end
	-- set angle
	o.setAngle = function(angle)
		if angle ~= o.angle then
			if angle > math.pi then
				o.angle = math.mod(angle, math.pi)
			elseif angle < 0.0 then
				o.angle = math.pi - math.mod(math.abs(angle), math.pi)
			else
				o.angle = angle
			end
			o.changed = true
		end
	end
	-- set glow size
	o.setSmooth = function(smooth)
		o.smooth = smooth
		o.changed = true
	end
	-- set glow size
	o.setGlowSize = function(size)
		o.glowSize = size
		o.changed = true
	end
	-- set glow strength
	o.setGlowStrength = function(strength)
		o.glowStrength = strength
		o.changed = true
	end
	-- get type
	o.getType = function()
		return "light"
	end

	return o
end

-- body object
function love.light.newBody(p, type, ...)
	local args = {...}
	local o = {}
	p.body[#p.body + 1] = o
	p.changed = true
	o.id = #p.body
	o.type = type
	o.normal = nil
	o.glow = nil
	if o.type == "circle" then
		o.x = args[1] or 0
		o.y = args[2] or 0
		o.radius = args[3] or 16
		o.ox = args[4] or 0
		o.oy = args[5] or 0
		o.shadowType = "circle"
		o.reflection = false
		o.reflective = false
		o.refraction = false
		o.refractive = false
	elseif o.type == "rectangle" then
		o.x = args[1] or 0
		o.y = args[2] or 0
		o.width = args[3] or 64
		o.height = args[4] or 64
		o.ox = o.width * 0.5
		o.oy = o.height * 0.5
		o.shadowType = "rectangle"
		o.data = {
			o.x - o.ox,
			o.y - o.oy,
			o.x - o.ox + o.width,
			o.y - o.oy,
			o.x - o.ox + o.width,
			o.y - o.oy + o.height,
			o.x - o.ox,
			o.y - o.oy + o.height
		}
		o.reflection = false
		o.reflective = false
		o.refraction = false
		o.refractive = false
	elseif o.type == "polygon" then
		o.shadowType = "polygon"
		o.data = args or {0, 0, 0, 0, 0, 0}
		o.reflection = false
		o.reflective = false
		o.refraction = false
		o.refractive = false
	elseif o.type == "image" then
		o.img = args[1]
		o.x = args[2] or 0
		o.y = args[3] or 0
		if o.img then
			o.imgWidth = o.img:getWidth()
			o.imgHeight = o.img:getHeight()
			o.width = args[4] or o.imgWidth
			o.height = args[5] or o.imgHeight
			o.ix = o.imgWidth * 0.5
			o.iy = o.imgHeight * 0.5
		else
			o.width = args[4] or 64
			o.height = args[5] or 64
		end
		o.ox = args[6] or o.width * 0.5
		o.oy = args[7] or o.height * 0.5
		o.shadowType = "rectangle"
		o.data = {
			o.x - o.ox,
			o.y - o.oy,
			o.x - o.ox + o.width,
			o.y - o.oy,
			o.x - o.ox + o.width,
			o.y - o.oy + o.height,
			o.x - o.ox,
			o.y - o.oy + o.height
		}
		o.reflection = false
		o.reflective = true
		o.refraction = false
		o.refractive = false
	elseif o.type == "refraction" then
		o.normal = args[1]
		o.x = args[2] or 0
		o.y = args[3] or 0
		if o.normal then
			o.normalWidth = o.normal:getWidth()
			o.normalHeight = o.normal:getHeight()
			o.width = args[4] or o.normalWidth
			o.height = args[5] or o.normalHeight
			o.nx = o.normalWidth * 0.5
			o.ny = o.normalHeight * 0.5
			o.normal:setWrap("repeat", "repeat")
			o.normalVert = {
				{0.0, 0.0, 0.0, 0.0},
				{o.width, 0.0, 1.0, 0.0},
				{o.width, o.height, 1.0, 1.0},
				{0.0, o.height, 0.0, 1.0}
			}
			o.normalMesh = love.graphics.newMesh(o.normalVert, o.normal, "fan")
		else
			o.width = args[4] or 64
			o.height = args[5] or 64
		end
		o.ox = o.width / 2.0
		o.oy = o.height / 2.0
		o.reflection = false
		o.reflective = false
		o.refraction = true
		o.refractive = false
	end
	o.shine = true
	o.red = 0
	o.green = 0
	o.blue = 0
	o.alpha = 1.0
	o.glowRed = 255
	o.glowGreen = 255
	o.glowBlue = 255
	o.glowStrength = 0.0
	o.tileX = 0
	o.tileY = 0
	-- refresh
	o.refresh = function()
		if o.data then
			o.data[1] = o.x - o.ox
			o.data[2] = o.y - o.oy
			o.data[3] = o.x - o.ox + o.width
			o.data[4] = o.y - o.oy
			o.data[5] = o.x - o.ox + o.width
			o.data[6] = o.y - o.oy + o.height
			o.data[7] = o.x - o.ox
			o.data[8] = o.y - o.oy + o.height
		end
	end
	-- set position
	o.setPosition = function(x, y)
		if x ~= o.x or y ~= o.y then
			o.x = x
			o.y = y
			o.refresh()
			p.changed = true
		end
	end
	-- set x position
	o.setX = function(x)
		if x ~= o.x then
			o.x = x
			o.refresh()
			p.changed = true
		end
	end
	-- set y position
	o.setY = function(y)
		if y ~= o.y then
			o.y = y
			o.refresh()
			p.changed = true
		end
	end
	-- get x position
	o.getX = function()
		return o.x
	end
	-- get y position
	o.getY = function(y)
		return o.y
	end
	-- get width
	o.getWidth = function()
		return o.width
	end
	-- get height
	o.getHeight = function()
		return o.height
	end
	-- get image width
	o.getImageWidth = function()
		return o.imgWidth
	end
	-- get image height
	o.getImageHeight = function()
		return o.imgHeight
	end
	-- set dimension
	o.setDimension = function(width, height)
		o.width = width
		o.height = height
		o.refresh()
		p.changed = true
	end
	-- set offset
	o.setOffset = function(ox, oy)
		if ox ~= o.ox or oy ~= o.oy then
			o.ox = ox
			o.oy = oy
			if o.shadowType == "rectangle" then
				o.refresh()
			end
			p.changed = true
		end
	end
	-- set offset
	o.setImageOffset = function(ix, iy)
		if ix ~= o.ix or iy ~= o.iy then
			o.ix = ix
			o.iy = iy
			o.refresh()
			p.changed = true
		end
	end
	-- set offset
	o.setNormalOffset = function(nx, ny)
		if nx ~= o.nx or ny ~= o.ny then
			o.nx = nx
			o.ny = ny
			o.refresh()
			p.changed = true
		end
	end
	-- set glow color
	o.setGlowColor = function(red, green, blue)
		o.glowRed = red
		o.glowGreen = green
		o.glowBlue = blue
		p.changed = true
	end
	-- set glow alpha
	o.setGlowStrength = function(strength)
		o.glowStrength = strength
		p.changed = true
	end
	-- get radius
	o.getRadius = function()
		return o.radius
	end
	-- set radius
	o.setRadius = function(radius)
		if radius ~= o.radius then
			o.radius = radius
			p.changed = true
		end
	end
	-- set polygon data
	o.setPoints = function(...)
		o.data = {...}
		p.changed = true
	end
	-- get polygon data
	o.getPoints = function()
		return unpack(o.data)
	end
	-- set shadow on/off
	o.setShadowType = function(type)
		o.shadowType = type
		p.changed = true
	end
	-- set shadow on/off
	o.setShadow = function(b)
		o.castsNoShadow = not b
		p.changed = true
	end
	-- set shine on/off
	o.setShine = function(b)
		o.shine = b
		p.changed = true
	end
	-- set glass color
	o.setColor = function(red, green, blue)
		o.red = red
		o.green = green
		o.blue = blue
		p.changed = true
	end
	-- set glass alpha
	o.setAlpha = function(alpha)
		o.alpha = alpha
		p.changed = true
	end
	-- set reflection on/off
	o.setReflection = function(reflection)
		o.reflection = reflection
	end
	-- set refraction on/off
	o.setRefraction = function(refraction)
		o.refraction = refraction
	end
	-- set reflective on other objects on/off
	o.setReflective = function(reflective)
		o.reflective = reflective
	end
	-- set refractive on other objects on/off
	o.setRefractive = function(refractive)
		o.refractive = refractive
	end
	-- set image
	o.setImage = function(img)
		if img then
			o.img = img
			o.imgWidth = o.img:getWidth()
			o.imgHeight = o.img:getHeight()
			o.ix = o.imgWidth * 0.5
			o.iy = o.imgHeight * 0.5
		end
	end
	-- set normal
	o.setNormalMap = function(normal)
		if normal then
			o.normal = normal
			o.normalWidth = o.normal:getWidth()
			o.normalHeight = o.normal:getHeight()
			o.nx = o.normalWidth * 0.5
			o.ny = o.normalHeight * 0.5
		end
	end
	-- set height map
	o.setHeightMap = function(heightMap, strength)
		o.normal = HeightMapToNormalMap(heightMap, strength)
		o.normalWidth = o.normal:getWidth()
		o.normalHeight = o.normal:getHeight()
		o.nx = o.normalWidth * 0.5
		o.ny = o.normalHeight * 0.5
	end
	-- generate flat normal map
	o.generateNormalMapFlat = function(mode)
		local imgData = o.img:getData()
		local imgNormalData = love.image.newImageData(o.imgWidth, o.imgHeight)
		local color

		if mode == "top" then
			color = {127, 127, 255}
		elseif mode == "front" then
			color = {127, 255, 127}
		elseif mode == "back" then
			color = {127, 0, 127}
		elseif mode == "left" then
			color = {31, 255, 223}
		elseif mode == "right" then
			color = {223, 223, 127}
		end

		for i = 0, o.imgHeight - 1 do
			for k = 0, o.imgWidth - 1 do
				local r, g, b, a = imgData:getPixel(k, i)
				if a > 0 then
					imgNormalData:setPixel(k, i, color[1], color[2], color[3], 255)
				end
			end
		end

		o.normal = love.graphics.newImage(imgNormalData)
		o.normalWidth = o.normal:getWidth()
		o.normalHeight = o.normal:getHeight()
		o.nx = o.normalWidth * 0.5
		o.ny = o.normalHeight * 0.5
	end
	-- generate faded normal map
	o.generateNormalMapGradient = function(horizontalGradient, verticalGradient)
		local imgData = o.img:getData()
		local imgNormalData = love.image.newImageData(o.imgWidth, o.imgHeight)
		local dx = 255.0 / o.imgWidth
		local dy = 255.0 / o.imgHeight
		local nx
		local ny
		local nz

		for i = 0, o.imgWidth - 1 do
			for k = 0, o.imgHeight - 1 do
				local r, g, b, a = imgData:getPixel(i, k)
				if a > 0 then
					if horizontalGradient == "gradient" then
						nx = i * dx
					elseif horizontalGradient == "inverse" then
						nx = 255 - i * dx
					else
						nx = 127
					end

					if verticalGradient == "gradient" then
						ny = 127 + k * dy * 0.5
						nz = 255 - k * dy * 0.5
					elseif verticalGradient == "inverse" then
						ny = 127 - k * dy * 0.5
						nz = 127 - k * dy * 0.25
					else
						ny = 255
						nz = 127
					end

					imgNormalData:setPixel(i, k, nx, ny, nz, 255)
				end
			end
		end

		o.normal = love.graphics.newImage(imgNormalData)
		o.normalWidth = o.normal:getWidth()
		o.normalHeight = o.normal:getHeight()
		o.nx = o.normalWidth * 0.5
		o.ny = o.normalHeight * 0.5
	end
	-- generate normal map
	o.generateNormalMap = function(strength)
		o.normal = HeightMapToNormalMap(o.img, strength)
		o.normalWidth = o.normal:getWidth()
		o.normalHeight = o.normal:getHeight()
		o.nx = o.normalWidth * 0.5
		o.ny = o.normalHeight * 0.5
	end
	-- set normal
	o.setGlowMap = function(glow)
		o.glow = glow
		o.glowStrength = 1.0
	end
	-- set tile offset
	o.setNormalTileOffset = function(tx, ty)
		o.tileX = tx / o.normalWidth
		o.tileY = ty / o.normalHeight
		o.normalVert = {
			{0.0, 0.0, o.tileX, o.tileY},
			{o.normalWidth, 0.0, o.tileX + 1.0, o.tileY},
			{o.normalWidth, o.normalHeight, o.tileX + 1.0, o.tileY + 1.0},
			{0.0, o.normalHeight, o.tileX, o.tileY + 1.0}
		}
		p.changed = true
	end
	-- get type
	o.getType = function()
		return o.type
	end
	-- get type
	o.setShadowType = function(type, ...)
		o.shadowType = type
		local args = {...}
		if o.shadowType == "circle" then
			o.radius = args[1] or 16
			o.ox = args[2] or 0
			o.oy = args[3] or 0
		elseif o.shadowType == "rectangle" then
			o.width = args[1] or 64
			o.height = args[2] or 64
			o.ox = args[3] or o.width * 0.5
			o.oy = args[4] or o.height * 0.5
			o.data = {
				o.x - o.ox,
				o.y - o.oy,
				o.x - o.ox + o.width,
				o.y - o.oy,
				o.x - o.ox + o.width,
				o.y - o.oy + o.height,
				o.x - o.ox,
				o.y - o.oy + o.height
			}
		elseif o.shadowType == "polygon" then
			o.data = args or {0, 0, 0, 0, 0, 0}
		elseif o.shadowType == "image" then
			if o.img then
				o.width = o.imgWidth
				o.height = o.imgHeight
				o.shadowVert = {
					{0.0, 0.0, 0.0, 0.0},
					{o.width, 0.0, 1.0, 0.0},
					{o.width, o.height, 1.0, 1.0},
					{0.0, o.height, 0.0, 1.0}
				}
				if not o.shadowMesh then
					o.shadowMesh = love.graphics.newMesh(o.shadowVert, o.img, "fan")
					o.shadowMesh:setVertexColors(true)
				end
			else
				o.width = 64
				o.height = 64
			end
			o.shadowX = args[1] or 0
			o.shadowY = args[2] or 0
			o.fadeStrength = args[3] or 0.0
		end
	end

	return o
end

-- rectangle object
function love.light.newRectangle(p, x, y, width, height)
	return p.newBody("rectangle", x, y, width, height)
end

-- circle object
function love.light.newCircle(p, x, y, radius)
	return p.newBody("circle", x, y, radius)
end

-- poly object
function love.light.newPolygon(p, ...)
	return p.newBody("polygon", ...)
end

-- image object
function love.light.newImage(p, img, x, y, width, height, ox, oy)
	return p.newBody("image", img, x, y, width, height, ox, oy)
end

-- refraction object
function love.light.newRefraction(p, normal, x, y, width, height)
	return p.newBody("refraction", normal, x, y, width, height)
end

-- refraction object (height map)
function love.light.newRefractionHeightMap(p, heightMap, x, y, strength)
	local normal = HeightMapToNormalMap(heightMap, strength)
	return love.light.newRefraction(p, normal, x, y)
end

-- vector functions
function normalize(v)
	local len = math.sqrt(math.pow(v[1], 2) + math.pow(v[2], 2))
	local normalizedv = {v[1] / len, v[2] / len}
	return normalizedv
end

function dot(v1, v2)
	return v1[1] * v2[1] + v1[2] * v2[2]
end

function lengthSqr(v)
    return v[1] * v[1] + v[2] * v[2]
end

function length(v)
    return math.sqrt(lengthSqr(v))
end

function calculateShadows(light, body)
    local shadowGeometry = {}
    local shadowLength = 10000

    for i = 1, #body do
		if body[i].shadowType == "rectangle" or body[i].shadowType == "polygon" then
			curPolygon = body[i].data
			if not body[i].castsNoShadow then 
				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 = normalize(normal)
					lightToPoint = normalize(lightToPoint)

					local dotProduct = 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 = 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 = 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 = body[i].alpha
					curShadowGeometry.red = body[i].red
					curShadowGeometry.green = body[i].green
					curShadowGeometry.blue = body[i].blue
					shadowGeometry[#shadowGeometry + 1] = curShadowGeometry
				end
			end
		elseif body[i].shadowType == "circle" then
			local length = math.sqrt(math.pow(light.x - (body[i].x - body[i].ox), 2) + math.pow(light.y - (body[i].y - body[i].oy), 2))
			if length >= body[i].radius and length <= light.range then
				local curShadowGeometry = {}
				local angle = math.atan2(light.x - (body[i].x - body[i].ox), (body[i].y - body[i].oy) - light.y) + math.pi / 2
				local x2 = ((body[i].x - body[i].ox) + math.sin(angle) * body[i].radius)
				local y2 = ((body[i].y - body[i].oy) - math.cos(angle) * body[i].radius)
				local x3 = ((body[i].x - body[i].ox) - math.sin(angle) * body[i].radius)
				local y3 = ((body[i].y - body[i].oy) + math.cos(angle) * body[i].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 = body[i].alpha
				curShadowGeometry.red = body[i].red
				curShadowGeometry.green = body[i].green
				curShadowGeometry.blue = body[i].blue
				shadowGeometry[#shadowGeometry + 1] = curShadowGeometry
			end
		end
	end

    return shadowGeometry
end

shadowStencil = function()
	for i = 1,#LOVE_LIGHT_SHADOW_GEOMETRY do
		if LOVE_LIGHT_SHADOW_GEOMETRY[i].alpha == 1.0 then
			love.graphics.polygon("fill", unpack(LOVE_LIGHT_SHADOW_GEOMETRY[i]))
		end
	end
    for i = 1, #LOVE_LIGHT_BODY do
		if LOVE_LIGHT_BODY[i].shadowType == "circle" then
			love.graphics.circle("fill", LOVE_LIGHT_BODY[i].x - LOVE_LIGHT_BODY[i].ox, LOVE_LIGHT_BODY[i].y - LOVE_LIGHT_BODY[i].oy, LOVE_LIGHT_BODY[i].radius)
		elseif LOVE_LIGHT_BODY[i].shadowType == "rectangle" then
			love.graphics.rectangle("fill", LOVE_LIGHT_BODY[i].x - LOVE_LIGHT_BODY[i].ox, LOVE_LIGHT_BODY[i].y - LOVE_LIGHT_BODY[i].oy, LOVE_LIGHT_BODY[i].width, LOVE_LIGHT_BODY[i].height)
		elseif LOVE_LIGHT_BODY[i].shadowType == "polygon" then
			love.graphics.polygon("fill", unpack(LOVE_LIGHT_BODY[i].data))
		elseif LOVE_LIGHT_BODY[i].shadowType == "image" then
			--love.graphics.rectangle("fill", LOVE_LIGHT_BODY[i].x - LOVE_LIGHT_BODY[i].ox, LOVE_LIGHT_BODY[i].y - LOVE_LIGHT_BODY[i].oy, LOVE_LIGHT_BODY[i].width, LOVE_LIGHT_BODY[i].height)
		end
	end
end

polyStencil = function()
    for i = 1, #LOVE_LIGHT_BODY do
		if LOVE_LIGHT_BODY[i].shine and (LOVE_LIGHT_BODY[i].glowStrength == 0.0 or (LOVE_LIGHT_BODY[i].type == "image" and not LOVE_LIGHT_BODY[i].normal)) then
			if LOVE_LIGHT_BODY[i].shadowType == "circle" then
				love.graphics.circle("fill", LOVE_LIGHT_BODY[i].x - LOVE_LIGHT_BODY[i].ox, LOVE_LIGHT_BODY[i].y - LOVE_LIGHT_BODY[i].oy, LOVE_LIGHT_BODY[i].radius)
			elseif LOVE_LIGHT_BODY[i].shadowType == "rectangle" then
				love.graphics.rectangle("fill", LOVE_LIGHT_BODY[i].x - LOVE_LIGHT_BODY[i].ox, LOVE_LIGHT_BODY[i].y - LOVE_LIGHT_BODY[i].oy, LOVE_LIGHT_BODY[i].width, LOVE_LIGHT_BODY[i].height)
			elseif LOVE_LIGHT_BODY[i].shadowType == "polygon" then
				love.graphics.polygon("fill", unpack(LOVE_LIGHT_BODY[i].data))
			elseif LOVE_LIGHT_BODY[i].shadowType == "image" then
				--love.graphics.rectangle("fill", LOVE_LIGHT_BODY[i].x - LOVE_LIGHT_BODY[i].ox, LOVE_LIGHT_BODY[i].y - LOVE_LIGHT_BODY[i].oy, LOVE_LIGHT_BODY[i].width, LOVE_LIGHT_BODY[i].height)
			end
		end
	end
end

function HeightMapToNormalMap(heightMap, strength)
	local imgData = heightMap:getData()
	local imgData2 = love.image.newImageData(heightMap:getWidth(), heightMap:getHeight())
	local red, green, blue, alpha
	local x, y
	local matrix = {}
	matrix[1] = {}
	matrix[2] = {}
	matrix[3] = {}
	strength = strength or 1.0

	for i = 0, heightMap:getHeight() - 1 do
		for k = 0, heightMap:getWidth() - 1 do
			for l = 1, 3 do
				for m = 1, 3 do
					if k + (l - 1) < 1 then
						x = heightMap:getWidth() - 1
					elseif k + (l - 1) > heightMap:getWidth() - 1 then
						x = 1
					else
						x = k + l - 1
					end

					if i + (m - 1) < 1 then
						y = heightMap:getHeight() - 1
					elseif i + (m - 1) > heightMap:getHeight() - 1 then
						y = 1
					else
						y = i + m - 1
					end

					local red, green, blue, alpha = imgData:getPixel(x, y)
					matrix[l][m] = red
				end
			end

			red = (255 + ((matrix[1][2] - matrix[2][2]) + (matrix[2][2] - matrix[3][2])) * strength) / 2.0
			green = (255 - ((matrix[2][2] - matrix[1][1]) + (matrix[2][3] - matrix[2][2])) * strength) / 2.0
			blue = 192

			imgData2:setPixel(k, i, red, green, blue)
		end
	end

	return love.graphics.newImage(imgData2)
end