Add pixel selfshadows on images with normal maps

2024-12-24 20:24:19 +00:00 · 2014-03-05 06:51:33 +01:00 · 2014-03-05 06:51:33 +01:00 · f23b66b7cd
commit f23b66b7cd
parent d1b1b3e0fa
11 changed files with 358 additions and 46 deletions
--- a/chest.png
+++ b/chest.png
--- a/chest_normal.png
+++ b/chest_normal.png
--- a/circle.png
+++ b/circle.png
--- a/circle_normal.png
+++ b/circle_normal.png
--- a/cone.png
+++ b/cone.png
--- a/cone_normal.png
+++ b/cone_normal.png
--- a/light.lua
+++ b/light.lua
@ -1,6 +1,7 @@
 LOVE_LIGHT_CURRENT = nil
 LOVE_LIGHT_CIRCLE = nil
 LOVE_LIGHT_POLY = nil
+LOVE_LIGHT_IMAGE = nil
 LOVE_LIGHT_LAST_BUFFER = nil

 LOVE_LIGHT_BLURV = love.graphics.newShader("shader/blurv.glsl")
@ -13,11 +14,15 @@ function love.light.newWorld()
 	local o = {}
 	o.lights = {}
 	o.ambient = {0, 0, 0}
-	o.poly = {}
 	o.circle = {}
+	o.poly = {}
+	o.img = {}
 	o.shadow = love.graphics.newCanvas()
 	o.shine = love.graphics.newCanvas()
-	o.shader = love.graphics.newShader("shader/light.glsl")
+	o.pixelShadow = love.graphics.newCanvas()
+	o.pixelShadow2 = love.graphics.newCanvas()
+	o.shader = love.graphics.newShader("shader/poly_shadow.glsl")
+	o.shader2 = love.graphics.newShader("shader/pixel_self_shadow.glsl")
 	o.changed = true
 	o.blur = true
 	-- update
@ -34,8 +39,9 @@ function love.light.newWorld()
 		end

 		local lightsOnScreen = 0
-		LOVE_LIGHT_POLY = o.poly
 		LOVE_LIGHT_CIRCLE = o.circle
+		LOVE_LIGHT_POLY = o.poly
+		LOVE_LIGHT_IMAGE = o.img
 		for i = 1, #o.lights do
 			if o.lights[i].changed or o.changed then
 				local curLightX = o.lights[i].x
@ -88,6 +94,7 @@ function love.light.newWorld()
 			end
 		end

+		-- update shadow
 		love.graphics.setShader()
 		if not o.changed then
 			love.graphics.setCanvas(o.shadow)
@ -102,8 +109,9 @@ function love.light.newWorld()
 			end
 		end

+		-- update shine
 		love.graphics.setCanvas(o.shine)
-		love.graphics.setColor(0,0,0)
+		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)
@ -112,6 +120,50 @@ function love.light.newWorld()
 			love.graphics.draw(o.lights[i].shine)
 		end

+				love.graphics.setColor(255, 255, 255)
+		love.graphics.setBlendMode("alpha")
+		o.pixelShadow:clear()
+		math.randomseed(2)
+		love.graphics.setShader()
+		love.graphics.setCanvas(o.pixelShadow)
+
+		for i = 1, #o.img do
+			if o.img[i].normal then
+				love.graphics.draw(o.img[i].normal, o.img[i].x - o.img[i].ox2, o.img[i].y - o.img[i].oy2)
+			end
+		end
+
+		-- update pixel shadow
+		o.pixelShadow2:clear()
+		love.graphics.setCanvas(o.pixelShadow2)
+		love.graphics.setBlendMode("additive")
+		love.graphics.setShader(o.shader2)
+
+		local curLightAmbient = {
+			o.ambient[1] / 255.0,
+			o.ambient[2] / 255.0,
+			o.ambient[3] / 255.0
+		}
+		for i = 1, #o.lights do
+			local curLightColor = {
+				o.lights[i].red / 255.0,
+				o.lights[i].green / 255.0,
+				o.lights[i].blue / 255.0
+			}
+			o.shader2:send("lightPosition", {o.lights[i].x, love.graphics.getHeight() - o.lights[i].y, 16})
+			o.shader2:send("lightRange", {o.lights[i].range})
+			o.shader2:send("lightColor", curLightColor)
+			o.shader2:send("lightAmbient", curLightAmbient)
+			o.shader2:send("lightSmooth", {o.lights[i].smooth})
+			love.graphics.draw(o.pixelShadow)
+		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.graphics.setShader()
 		love.graphics.setBlendMode("alpha")
 		love.graphics.setStencil()
@ -142,7 +194,6 @@ function love.light.newWorld()
 			love.graphics.setBlendMode("alpha")
 		end
 	end
-
 	-- draw shine
 	o.drawShine = function()
 		love.graphics.setColor(255, 255, 255)
@ -151,6 +202,29 @@ function love.light.newWorld()
 		love.graphics.draw(o.shine)
 		love.graphics.setBlendMode("alpha")
 	end
+	-- draw pixel shadow
+	o.drawPixelShadow = function()
+		love.graphics.setColor(255, 255, 255)
+		if o.blur and false then
+			LOVE_LIGHT_LAST_BUFFER = love.graphics.getCanvas()
+			love.graphics.setBlendMode("alpha")
+			love.graphics.setCanvas(o.pixelShadow)
+			love.graphics.setShader(LOVE_LIGHT_BLURV)
+			love.graphics.draw(o.pixelShadow)
+			love.graphics.setShader(LOVE_LIGHT_BLURH)
+			love.graphics.draw(o.pixelShadow)
+			love.graphics.setCanvas(LOVE_LIGHT_LAST_BUFFER)
+			love.graphics.setBlendMode("multiplicative")
+			love.graphics.setShader()
+			love.graphics.draw(o.pixelShadow)
+			love.graphics.setBlendMode("alpha")
+		else
+			love.graphics.setBlendMode("multiplicative")
+			love.graphics.setShader()
+			love.graphics.draw(o.pixelShadow)
+			love.graphics.setBlendMode("alpha")
+		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)
@ -165,6 +239,7 @@ function love.light.newWorld()
 	o.clearObjects = function()
 		o.poly = {}
 		o.circle = {}
+		o.img = {}
 	end
 	-- set ambient color
 	o.setAmbientColor = function(red, green, blue)
@ -199,6 +274,10 @@ function love.light.newWorld()
 	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
 	-- set polygon data
 	o.setPoints = function(n, ...)
 		o.poly[n].data = {...}
@ -238,6 +317,7 @@ function love.light.newLight(p, x, y, red, green, blue, range)
 	o.shine = love.graphics.newCanvas()
 	o.x = x
 	o.y = y
+	o.z = 1
 	o.red = red
 	o.green = green
 	o.blue = blue
@ -351,6 +431,14 @@ function love.light.newRectangle(p, x, y, w, h)
 		o.shine = b
 		p.changed = true
 	end
+	-- get x
+	o.getX = function()
+		return o.x
+	end
+	-- get y
+	o.getY = function()
+		return o.y
+	end
 	-- get type
 	o.getType = function()
 		return "rectangle"
@ -384,6 +472,16 @@ function love.light.newCircle(p, x, y, radius)
 			p.changed = true
 		end
 	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
 	-- get x
 	o.getX = function()
 		return o.x
@ -421,6 +519,16 @@ function love.light.newPolygon(p, ...)
 		o.data = {...}
 		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
 	-- get polygon data
 	o.getPoints = function()
 		return unpack(o.data)
@ -433,6 +541,87 @@ function love.light.newPolygon(p, ...)
 	return o
 end

+-- image object
+function love.light.newImage(p, img, x, y, width, height, ox, oy)
+	local o = {}
+	p.poly[#p.poly + 1] = o
+	p.img[#p.img + 1] = o
+	o.id = #p.img
+	o.img = img
+	o.normal = nil
+	o.x = x
+	o.y = y
+	o.width = width or img:getWidth()
+	o.height = height or img:getHeight()
+	o.ox = o.width / 2.0
+	o.oy = o.height / 2.0
+	o.ox2 = ox or o.width / 2.0
+	o.oy2 = oy or o.height / 2.0
+	o.shine = true
+	p.changed = true
+	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
+	}
+	-- refresh
+	o.refresh = function()
+		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
+	-- 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 dimension
+	o.setDimension = function(width, height)
+		o.width = width
+		o.height = height
+		o.refresh()
+		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 image
+	o.setImage = function(img)
+		o.img = img
+	end
+	-- set normal
+	o.setNormal = function(normal)
+		o.normal = normal
+	end
+	-- get type
+	o.getType = function()
+		return "image"
+	end
+
+	return o
+end
+
 -- vector functions
 function normalize(v)
 	local len = math.sqrt(math.pow(v[1], 2) + math.pow(v[2], 2))
@ -452,7 +641,7 @@ function length(v)
    return math.sqrt(lengthSqr(v))
 end

-function calculateShadows(lightsource, geometry, circle)
+function calculateShadows(lightsource, geometry, circle, image)
    local shadowGeometry = {}
    local shadowLength = 10000

@ -541,17 +730,25 @@ shadowStencil = function()
    for i = 1, #LOVE_LIGHT_CIRCLE do
        love.graphics.circle("fill", LOVE_LIGHT_CIRCLE[i].getX(), LOVE_LIGHT_CIRCLE[i].getY(), LOVE_LIGHT_CIRCLE[i].getRadius())
 	end
+    for i = 1, #LOVE_LIGHT_IMAGE do
+		--love.graphics.rectangle("fill", LOVE_LIGHT_IMAGE[i].x, LOVE_LIGHT_IMAGE[i].y, LOVE_LIGHT_IMAGE[i].width, LOVE_LIGHT_IMAGE[i].height)
+    end
 end

 polyStencil = function()
-    for i=1, #LOVE_LIGHT_POLY do
-		if LOVE_LIGHT_POLY[i].shine then
-			love.graphics.polygon("fill", unpack(LOVE_LIGHT_POLY[i].data))
-		end
-    end
    for i = 1, #LOVE_LIGHT_CIRCLE do
 		if LOVE_LIGHT_CIRCLE[i].shine then
 			love.graphics.circle("fill", LOVE_LIGHT_CIRCLE[i].getX(), LOVE_LIGHT_CIRCLE[i].getY(), LOVE_LIGHT_CIRCLE[i].getRadius())
 		end
 	end
+    for i = 1, #LOVE_LIGHT_POLY do
+		if LOVE_LIGHT_POLY[i].shine then
+			love.graphics.polygon("fill", unpack(LOVE_LIGHT_POLY[i].data))
+		end
+    end
+    for i = 1, #LOVE_LIGHT_IMAGE do
+		if LOVE_LIGHT_IMAGE[i].shine then
+			--love.graphics.rectangle("fill", LOVE_LIGHT_IMAGE[i].x, LOVE_LIGHT_IMAGE[i].y, LOVE_LIGHT_IMAGE[i].width, LOVE_LIGHT_IMAGE[i].height)
+		end
+    end
 end
--- a/main.lua
+++ b/main.lua
@ -38,15 +38,23 @@ end

 function love.load()
    love.graphics.setBackgroundColor(0, 0, 0)
+	love.graphics.setDefaultFilter("nearest", "nearest")
 	quadScreen = love.graphics.newQuad(0, 0, love.window.getWidth(), love.window.getHeight(), 32, 32)
 	imgFloor = love.graphics.newImage("floor.png")
 	imgFloor:setWrap("repeat", "repeat")

+	circle = love.graphics.newImage "circle.png"
+	circle_normal = love.graphics.newImage "circle_normal.png"
+	cone = love.graphics.newImage "cone.png"
+	cone_normal = love.graphics.newImage "cone_normal.png"
+	chest = love.graphics.newImage "chest.png"
+	chest_normal = love.graphics.newImage "chest_normal.png"
+
 	-- light world
 	lightRange = 400
 	lightSmooth = 1.0
 	lightWorld = love.light.newWorld()
-	lightWorld.setAmbientColor(15, 15, 15)
+	lightWorld.setAmbientColor(15, 15, 31)
 	mouseLight = lightWorld.newLight(0, 0, 255, 127, 63, lightRange)
 	mouseLight.setGlowStrength(0.3)

@ -54,7 +62,7 @@ function love.load()
 	initScene()

 	helpOn = true
-	physicOn = true
+	physicOn = false
 	lightOn = true
 	gravityOn = 1
 	shadowBlurOn = true
@ -65,12 +73,16 @@ end
 function love.update(dt)
 	love.window.setTitle("FPS:" .. love.timer.getFPS())
 	mouseLight.setPosition(love.mouse.getX(), love.mouse.getY())
+	mx = love.mouse.getX()
+	my = love.mouse.getY()

    for i = 1, phyCnt do
 		if phyBody[i]:isAwake() then
-			if phyShape[i]:getType() == "polygon" then
+			if phyLight[i].getType() == "polygon" then
 				phyLight[i].setPoints(phyBody[i]:getWorldPoints(phyShape[i]:getPoints()))
-			else
+			elseif phyLight[i].getType() == "circle" then
+				phyLight[i].setPosition(phyBody[i]:getX(), phyBody[i]:getY())
+			elseif phyLight[i].getType() == "image" then
 				phyLight[i].setPosition(phyBody[i]:getX(), phyBody[i]:getY())
 			end
 		end
@ -128,7 +140,7 @@ function love.draw()
 		love.graphics.setColor(math.sin(i) * 255, math.cos(i) * 255, math.tan(i) * 255)
 		if phyLight[i].getType() == "polygon" then
 			love.graphics.polygon("fill", phyLight[i].getPoints())
-		else
+		elseif phyLight[i].getType() == "circle" then
 			love.graphics.circle("fill", phyLight[i].getX(), phyLight[i].getY(), phyLight[i].getRadius())
 		end
 	end
@ -138,25 +150,77 @@ function love.draw()
 		lightWorld.drawShine()
 	end

+	for i = 1, phyCnt do
+		love.graphics.setColor(191 + math.sin(i) * 63, 191 + math.cos(i) * 63, 191 + math.tan(i) * 63)
+		if phyLight[i].getType() == "image" then
+			love.graphics.draw(phyLight[i].img, phyLight[i].x - phyLight[i].ox2, phyLight[i].y - phyLight[i].oy2)
+		end
+	end
+
+	-- draw pixel shadow
+	lightWorld.drawPixelShadow()
+
 	-- draw help
 	if helpOn then
 		love.graphics.setColor(0, 0, 0, 191)
-		love.graphics.rectangle("fill", 8, 8, 210, 16 * 15)
-		love.graphics.setColor(255, 255, 255)
+		love.graphics.rectangle("fill", 8, 8, 210, 16 * 16)
+		love.graphics.setColor(0, 127, 255)
 		love.graphics.print("WASD: Move objects", 16, 16)
-		love.graphics.print("F1: Help on/off", 16, 32)
-		love.graphics.print("F2: Physic on/off", 16, 48)
-		love.graphics.print("F3: Light on/off", 16, 64)
-		love.graphics.print("F4: Clear objects", 16, 80)
-		love.graphics.print("F5: Clear lights", 16, 96)
-		love.graphics.print("F6: Gravity on/off", 16, 112)
-		love.graphics.print("F7: Shadowblur on/off", 16, 128)
-		love.graphics.print("F8: Bloom on/off", 16, 144)
-		love.graphics.print("F9: Texture on/off", 16, 160)
+		love.graphics.setColor(0, 255, 0)
+		love.graphics.print("F1: Help on", 16, 32)
+		if physicOn then
+			love.graphics.setColor(0, 255, 0)
+			love.graphics.print("F2: Physic on", 16, 48)
+		else
+			love.graphics.setColor(255, 0, 0)
+			love.graphics.print("F2: Physic off", 16, 48)
+		end
+		if lightOn then
+			love.graphics.setColor(0, 255, 0)
+			love.graphics.print("F3: Light on", 16, 64)
+		else
+			love.graphics.setColor(255, 0, 0)
+			love.graphics.print("F3: Light off", 16, 64)
+		end
+		if gravityOn == 1.0 then
+			love.graphics.setColor(0, 255, 0)
+			love.graphics.print("F4: Gravity on", 16, 80)
+		else
+			love.graphics.setColor(255, 0, 0)
+			love.graphics.print("F4: Gravity off", 16, 80)
+		end
+		if shadowBlurOn then
+			love.graphics.setColor(0, 255, 0)
+			love.graphics.print("F5: Shadowblur on", 16, 96)
+		else
+			love.graphics.setColor(255, 0, 0)
+			love.graphics.print("F5: Shadowblur off", 16, 96)
+		end
+		if bloomOn then
+			love.graphics.setColor(0, 255, 0)
+			love.graphics.print("F6: Bloom on", 16, 112)
+		else
+			love.graphics.setColor(255, 0, 0)
+			love.graphics.print("F6: Bloom off", 16, 112)
+		end
+		if textureOn then
+			love.graphics.setColor(0, 255, 0)
+			love.graphics.print("F7: Texture on", 16, 128)
+		else
+			love.graphics.setColor(255, 0, 0)
+			love.graphics.print("F7: Texture off", 16, 128)
+		end
+		love.graphics.setColor(255, 255, 255)
+		love.graphics.print("F11: Clear objects", 16, 144)
+		love.graphics.print("F12: Clear lights", 16, 160)
 		love.graphics.print("M.left: Add cube", 16, 176)
 		love.graphics.print("M.middle: Add light", 16, 192)
 		love.graphics.print("M.right: Add circle", 16, 208)
 		love.graphics.print("M.scroll: Change smooth", 16, 224)
+		love.graphics.print("1-3: Add image", 16, 240)
+	else
+		love.graphics.setColor(255, 255, 255, 63)
+		love.graphics.print("F1: Help", 8, 8)
 	end

 	-- draw shader
@ -215,22 +279,49 @@ function love.keypressed(k, u)
 	elseif k == "f3" then
 		lightOn = not lightOn
 	elseif k == "f4" then
+		gravityOn = 1 - gravityOn
+		physicWorld:setGravity(0, gravityOn * 9.81 * 64)
+	elseif k == "f5" then
+		shadowBlurOn = not shadowBlurOn
+		lightWorld.setBlur(shadowBlurOn)
+	elseif k == "f6" then
+		bloomOn = not bloomOn
+	elseif k == "f7" then
+		textureOn = not textureOn
+	elseif k == "f11" then
 		physicWorld:destroy()
 		lightWorld.clearObjects()
 		initScene()
-	elseif k == "f5" then
+	elseif k == "f12" then
 		lightWorld.clearLights()
-		mouseLight = lightWorld.newLight(0, 0, 127, 63, 0, lightRange)
+		mouseLight = lightWorld.newLight(0, 0, 255, 127, 63, lightRange)
 		mouseLight.setGlowStrength(0.3)
-	elseif k == "f6" then
-		gravityOn = 1 - gravityOn
-		physicWorld:setGravity(0, gravityOn * 9.81 * 64)
-	elseif k == "f7" then
-		shadowBlurOn = not shadowBlurOn
-		lightWorld.setBlur(shadowBlurOn)
-	elseif k == "f8" then
-		bloomOn = not bloomOn
-	elseif k == "f9" then
-		textureOn = not textureOn
+	elseif k == "1" then
+		-- add image
+		phyCnt = phyCnt + 1
+		phyLight[phyCnt] = lightWorld.newImage(circle, mx, my)
+		phyLight[phyCnt].setNormal(circle_normal)
+		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
+		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 32, 32)
+		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
+		phyFixture[phyCnt]:setRestitution(0.5)
+	elseif k == "2" then
+		-- add image
+		phyCnt = phyCnt + 1
+		phyLight[phyCnt] = lightWorld.newImage(cone, mx, my, 24, 12, 12, 28)
+		phyLight[phyCnt].setNormal(cone_normal)
+		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
+		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 25, 32)
+		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
+		phyFixture[phyCnt]:setRestitution(0.5)
+	elseif k == "3" then
+		-- add image
+		phyCnt = phyCnt + 1
+		phyLight[phyCnt] = lightWorld.newImage(chest, mx, my, 32, 24, 16, 36)
+		phyLight[phyCnt].setNormal(chest_normal)
+		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
+		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 32, 24)
+		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
+		phyFixture[phyCnt]:setRestitution(0.5)
 	end
 end
--- a/normal_palett.png
+++ b/normal_palett.png
--- a/shader/pixel_self_shadow.glsl
+++ b/shader/pixel_self_shadow.glsl
@ -0,0 +1,24 @@
+extern vec3 lightPosition;
+extern float lightRange;
+extern vec3 lightColor;
+extern vec3 lightAmbient;
+extern float lightSmooth;
+
+vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
+	vec3 lightDirection = vec3(pixel_coords.xy, 0) - lightPosition.xyz;
+	float distance = length(lightDirection);
+
+	vec4 pixel = Texel(texture, texture_coords);
+	vec3 normal = vec3(pixel.x, 1 - pixel.y, pixel.z);
+	normal = mix(vec3(-1), vec3(1), normal);
+
+	float att = 1 - distance / lightRange;
+
+	if(distance < lightRange && pixel.a > 0.0) {
+		return vec4(vec3(clamp(1 - dot(normal, lightDirection), 0.0, 1.0)) * lightColor * pow(att, lightSmooth) + lightAmbient, 1.0);
+	} else if(pixel.a == 0.0) {
+		return vec4(0.0);
+	} else {
+		return vec4(0.0, 0.0, 0.0, 1.0);
+	}
+}
--- a/shader/poly_shadow.glsl
+++ b/shader/poly_shadow.glsl
@ -1,7 +1,7 @@
 extern vec3 lightPositionRange;
 extern vec3 lightColor;
-extern float smooth = 1.0;
-extern vec2 glow = vec2(0.95, 0.2);
+extern float smooth;
+extern vec2 glow;

 vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords){
 	vec4 pixel = Texel(texture, texture_coords);
@ -11,7 +11,7 @@ vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords){

 	if (distance <= lightPositionRange.z) {
 		if (glow.x < 1.0 && glow.y > 0.0) {
-			pixel.rgb = lightColor * pow(att, smooth) + pow(smoothstep(glow.x, 1.0, att), smooth) * glow.y;
+			pixel.rgb = clamp(lightColor * pow(att, smooth) + pow(smoothstep(glow.x, 1.0, att), smooth) * glow.y, 0.0, 1.0);
 		} else {
 			pixel.rgb = lightColor * pow(att, smooth);
 		}