added image stencils for objects so shadows are properly stenciled, and made it so that object that dont cast shadows have shadows cast over them.

examples/complex.lua

@@ -27,9 +27,6 @@ function initScene()
 
 	phyCnt = 0
 	phyLight = {}
-	phyBody = {}
-	phyShape = {}
-	phyFixture = {}
 end
 
 function love.load()
@@ -141,34 +138,6 @@ function love.update(dt)
 	lightDirection = lightDirection + dt
 	colorAberration = math.max(0.0, colorAberration - dt * 10.0)
 
-	if love.keyboard.isDown("w") then
-		for i = 1, phyCnt do
-			if phyBody[i] then
-				phyBody[i]:applyForce(0, -2000)
-			end
-		end
-	elseif love.keyboard.isDown("s") then
-		for i = 1, phyCnt do
-			if phyBody[i] then
-				phyBody[i]:applyForce(0, 2000)
-			end
-		end
-	end
-
-	if love.keyboard.isDown("a") then
-		for i = 1, phyCnt do
-			if phyBody[i] then
-				phyBody[i]:applyForce(-2000, 0)
-			end
-		end
-	elseif love.keyboard.isDown("d") then
-		for i = 1, phyCnt do
-			if phyBody[i] then
-				phyBody[i]:applyForce(2000, 0)
-			end
-		end
-	end
-
 	if love.keyboard.isDown("up") then
 		offsetY = offsetY + dt * 200
 	elseif love.keyboard.isDown("down") then
@@ -194,29 +163,6 @@ function love.update(dt)
 	tileX = tileX + dt * 32.0
 	tileY = tileY + dt * 8.0
 
-  for i = 1, phyCnt do
-		if phyBody[i] and (phyBody[i]:isAwake() or offsetChanged) then
-			if phyLight[i]:getType() == "polygon" then
-				phyLight[i]:setPoints(phyBody[i]:getWorldPoints(phyShape[i]:getPoints()))
-			elseif phyLight[i]:getType() == "circle" then
-				phyLight[i]:setPosition(phyBody[i]:getPosition())
-			elseif phyLight[i]:getType() == "image" then
-				phyLight[i]:setPosition(phyBody[i]:getPosition())
-			elseif phyLight[i]:getType() == "refraction" then
-				--phyLight[i]:setPosition(phyBody[i]:getPosition())
-			end
-		end
-		if phyLight[i]:getType() == "refraction" then
-			--if math.mod(i, 2) == 0  then
-				phyLight[i]:setNormalTileOffset(tileX, tileY)
-			--end
-		end
-  end
-
-	if physicOn then
-		physicWorld:update(dt)
-	end
-
 	-- draw shader
 	if colorAberration > 0.0 then
 		-- vert / horz blur
@@ -305,27 +251,6 @@ function love.draw()
 		love.graphics.rectangle("fill", love.graphics.getWidth() - 244, love.graphics.getHeight() - 84, 244, 84)
 		love.graphics.setColor(0, 255, 0)
 		love.graphics.print("F1: Help (on)", 4 + 152 * 0, 4)
-		if physicOn then
-			love.graphics.setColor(0, 255, 0)
-			love.graphics.print("F2: Physic (on)", 4 + 152 * 1, 4)
-		else
-			love.graphics.setColor(255, 0, 0)
-			love.graphics.print("F2: Physic (off)", 4 + 152 * 1, 4)
-		end
-		if lightOn then
-			love.graphics.setColor(0, 255, 0)
-			love.graphics.print("F3: Light (on)", 4 + 152 * 2, 4)
-		else
-			love.graphics.setColor(255, 0, 0)
-			love.graphics.print("F3: Light (off)", 4 + 152 * 2, 4)
-		end
-		if gravityOn == 1.0 then
-			love.graphics.setColor(0, 255, 0)
-			love.graphics.print("F4: Gravity (on)", 4 + 152 * 3, 4)
-		else
-			love.graphics.setColor(255, 0, 0)
-			love.graphics.print("F4: Gravity (off)", 4 + 152 * 3, 4)
-		end
 		if shadowBlur >= 1.0 then
 			love.graphics.setColor(0, 255, 0)
 			love.graphics.print("F5: Shadowblur (" .. shadowBlur .. ")", 4 + 152 * 4, 4)
@@ -413,20 +338,12 @@ function love.mousepressed(x, y, c)
      x+w, y+h,
      x, y+h
     )
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, x, y, "dynamic")
-		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, w, h)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 	elseif c == "r" then
 		-- add circle
 		math.randomseed(love.timer.getTime())
 		cRadius = math.random(8, 32)
 		phyCnt = phyCnt + 1
 		phyLight[phyCnt] = lightWorld:newCircle(x, y, cRadius)
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, x, y, "dynamic")
-		phyShape[phyCnt] = love.physics.newCircleShape(0, 0, cRadius)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 	elseif c == "wu" then
 		if lightSmooth < 4.0 then
 			lightSmooth = lightSmooth * 1.1
@@ -444,13 +361,6 @@ function love.keypressed(k, u)
 	-- debug options
 	if k == "f1" then
 		helpOn = not helpOn
-	elseif k == "f2" then
-		physicOn = not physicOn
-	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
 		shadowBlur = math.max(1, shadowBlur * 2.0)
 		if shadowBlur > 8.0 then
@@ -518,10 +428,6 @@ function love.keypressed(k, u)
 		phyLight[phyCnt] = lightWorld:newImage(circle, mx, my)
 		phyLight[phyCnt]:setNormalMap(circle_normal)
 		phyLight[phyCnt]:setShadowType("circle", 16)
-		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
 		local r = lightWorld:getBodyCount() % 2
 		if r == 0 then
@@ -530,19 +436,11 @@ function love.keypressed(k, u)
 			phyLight[phyCnt] = lightWorld:newImage(cone, mx, my, 24, 12, 12, 16)
 			phyLight[phyCnt]:setNormalMap(cone_normal)
 			phyLight[phyCnt]:setShadowType("circle", 12)
-			phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-			phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 24, 32)
-			phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-			phyFixture[phyCnt]:setRestitution(0.5)
 		elseif r == 1 then
 			-- add image
 			phyCnt = phyCnt + 1
 			phyLight[phyCnt] = lightWorld:newImage(chest, mx, my, 32, 24, 16, 0)
 			phyLight[phyCnt]:setNormalMap(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
 	elseif k == "3" then
 		-- add image
@@ -554,10 +452,6 @@ function love.keypressed(k, u)
 			phyLight[phyCnt]:setGlowMap(ape_glow)
 		end
 		phyLight[phyCnt]:setMaterial(material[r + 1])
-		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)
 		phyLight[phyCnt]:setShadowType("image", 0, -16, 0.0)
 	elseif k == "4" then
 		-- add glow image
@@ -567,46 +461,26 @@ function love.keypressed(k, u)
 			phyLight[phyCnt] = lightWorld:newImage(machine, mx, my, 32, 24, 16, 0)
 			phyLight[phyCnt]:setNormalMap(machine_normal)
 			phyLight[phyCnt]:setGlowMap(machine_glow)
-			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)
 		elseif r == 1 then
 			phyCnt = phyCnt + 1
 			phyLight[phyCnt] = lightWorld:newImage(machine2, mx, my, 24, 12, 12, -4)
 			phyLight[phyCnt]:setNormalMap(machine2_normal)
 			phyLight[phyCnt]:setGlowMap(machine2_glow)
-			phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-			phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 24, 32)
-			phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-			phyFixture[phyCnt]:setRestitution(0.5)
 		elseif r == 2 then
 			phyCnt = phyCnt + 1
 			phyLight[phyCnt] = lightWorld:newImage(led, mx, my, 32, 6, 16, -8)
 			phyLight[phyCnt]:setNormalMap(led_normal)
 			phyLight[phyCnt]:setGlowMap(led_glow)
-			phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-			phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 32, 6)
-			phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-			phyFixture[phyCnt]:setRestitution(0.5)
 		elseif r == 3 then
 			phyCnt = phyCnt + 1
 			phyLight[phyCnt] = lightWorld:newImage(led2, mx, my, 32, 6, 16, -8)
 			phyLight[phyCnt]:setNormalMap(led_normal)
 			phyLight[phyCnt]:setGlowMap(led_glow2)
-			phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-			phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 32, 6)
-			phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-			phyFixture[phyCnt]:setRestitution(0.5)
 		elseif r == 4 then
 			phyCnt = phyCnt + 1
 			phyLight[phyCnt] = lightWorld:newImage(led3, mx, my, 32, 6, 16, -8)
 			phyLight[phyCnt]:setNormalMap(led_normal)
 			phyLight[phyCnt]:setGlowMap(led_glow3)
-			phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-			phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 32, 6)
-			phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-			phyFixture[phyCnt]:setRestitution(0.5)
 		end
 	elseif k == "5" then
 		-- add image
@@ -614,20 +488,12 @@ function love.keypressed(k, u)
 		phyLight[phyCnt] = lightWorld:newImage(cone_large, mx, my, 24, 128, 12, 64)
 		phyLight[phyCnt]:setNormalMap(cone_large_normal)
 		phyLight[phyCnt]:setShadowType("image", 0, -6, 0.0)
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 24, 32)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 	elseif k == "6" then
 		-- add image
 		phyCnt = phyCnt + 1
 		phyLight[phyCnt] = lightWorld:newImage(blopp, mx, my, 42, 16, 21, 0)
 		phyLight[phyCnt]:generateNormalMapGradient("gradient", "gradient")
 		phyLight[phyCnt]:setAlpha(255 * 0.5)
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 42, 29)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 	elseif k == "7" then
 		-- add image
 		phyCnt = phyCnt + 1
@@ -636,10 +502,6 @@ function love.keypressed(k, u)
 		phyLight[phyCnt]:setGlowMap(tile_glow)
 		phyLight[phyCnt]:setShadow(false)
 		phyLight[phyCnt].reflective = false
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, 64, 64)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 	elseif k == "8" then
 		-- add rectangle
 		phyCnt = phyCnt + 1
@@ -652,11 +514,6 @@ function love.keypressed(k, u)
     )
 		phyLight[phyCnt]:setAlpha(255 * 0.5)
 		phyLight[phyCnt]:setGlowStrength(1.0)
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-		math.randomseed(love.timer.getTime())
-		phyShape[phyCnt] = love.physics.newRectangleShape(0, 0, w, h)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 		math.randomseed(phyCnt)
 		phyLight[phyCnt]:setGlowColor(math.random(0, 255), math.random(0, 255), math.random(0, 255))
 		math.randomseed(phyCnt)
@@ -673,10 +530,6 @@ function love.keypressed(k, u)
 		phyLight[phyCnt]:setGlowColor(math.random(0, 255), math.random(0, 255), math.random(0, 255))
 		math.randomseed(phyCnt)
 		phyLight[phyCnt]:setColor(math.random(0, 255), math.random(0, 255), math.random(0, 255))
-		phyBody[phyCnt] = love.physics.newBody(physicWorld, mx, my, "dynamic")
-		phyShape[phyCnt] = love.physics.newCircleShape(0, 0, cRadius)
-		phyFixture[phyCnt] = love.physics.newFixture(phyBody[phyCnt], phyShape[phyCnt])
-		phyFixture[phyCnt]:setRestitution(0.5)
 	elseif k == "0" then
 		phyCnt = phyCnt + 1
 		phyLight[phyCnt] = lightWorld:newRefraction(refraction_normal, mx, my)

lib/body.lua

@@ -615,6 +615,12 @@ function body:drawMaterial()
   end
 end
 
+function body:drawStencil()
+  if not self.refraction and not self.reflection and not self.castsNoShadow then
+    love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
+  end
+end
+
 function body:drawShadow(light)
   if self.castsNoShadow or (self.zheight - light.z) > 0 then
     return

lib/init.lua

@@ -31,6 +31,7 @@ local PostShader = require(_PACKAGE..'postshader')
 local light_world = {}
 light_world.__index = light_world
 
+light_world.image_mask       = love.graphics.newShader(_PACKAGE.."/shaders/image_mask.glsl")
 light_world.shadowShader     = love.graphics.newShader(_PACKAGE.."/shaders/shadow.glsl")
 light_world.refractionShader = love.graphics.newShader(_PACKAGE.."shaders/refraction.glsl")
 light_world.reflectionShader = love.graphics.newShader(_PACKAGE.."shaders/reflection.glsl")
@@ -122,17 +123,27 @@ function light_world:drawShadows(l,t,w,h,s)
   self.shadow_buffer:clear()
   for i = 1, #self.lights do
     local light = self.lights[i]
-    if self.lights[i]:isVisible() then
+    if light:isVisible() then
       -- create shadow map for this light
       self.shadowMap:clear()
       util.drawto(self.shadowMap, l, t, s, function()
+        --I dont know if it uses both or just calls both
         love.graphics.setStencil(function()
           local angle = light.direction - (light.angle / 2.0)
           love.graphics.arc("fill", light.x, light.y, light.range, angle, angle + light.angle)
         end)
+        love.graphics.setInvertedStencil(function()
+          love.graphics.setShader(self.image_mask)
           for k = 1, #self.bodies do
-          if self.bodies[k]:inLightRange(self.lights[i]) and self.bodies[k]:isVisible() then
+            if self.bodies[k]:inLightRange(light) and self.bodies[k]:isVisible() then
-            self.bodies[k]:drawShadow(self.lights[i])
+              self.bodies[k]:drawStencil()
+            end
+          end
+          love.graphics.setShader()
+        end)
+        for k = 1, #self.bodies do
+          if self.bodies[k]:inLightRange(light) and self.bodies[k]:isVisible() then
+            self.bodies[k]:drawShadow(light)
           end
         end
       end)

lib/shaders/image_mask.glsl

@@ -0,0 +1,6 @@
+//https://love2d.org/wiki/love.graphics.setStencil image mask
+vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
+  if (Texel(texture, texture_coords).rgb == vec3(0.0))
+    discard;
+  return vec4(1.0);
+}

lib/shaders/shadow.glsl

@@ -13,52 +13,38 @@ extern vec2 lightGlow;        //how brightly the light bulb part glows
 extern bool  invert_normal;   //if the light should invert normals
 
 vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
-  vec4 normalColor = Texel(normalMap, texture_coords);
-
   float dist = distance(lightPosition, vec3(pixel_coords, 1.0));
-  //if the pixel is within this lights range
+  if(dist > lightRange) { //not in range draw in shadows
-  if(dist > lightRange) {
-    //not in range draw in shadows
     return vec4(0.0, 0.0, 0.0, 1.0);
   }else{
-    vec3 normal;
+    vec4 shadowColor = Texel(texture, texture_coords);
-    if(normalColor.a > 0.0) {
+    vec4 normalColor = Texel(normalMap, texture_coords);
-      //if on the normal map ie there is normal map data
+    vec4 pixel;
-      //so get the normal data
+    //calculate attenuation of light based on the distance
-      if(invert_normal) {
-        normal = normalize(vec3(normalColor.r, 1 - normalColor.g, normalColor.b) * 2.0 - 1.0); 
-      } else {
-        normal = normalize(normalColor.rgb * 2.0 - 1.0);
-      }
-    } else {
-      // not on the normal map so it is the floor with a normal point strait up
-      normal = vec3(0.0, 0.0, 1.0);
-    }
-    //calculater attenuation of light based on the distance
     float att = clamp((1.0 - dist / lightRange) / lightSmooth, 0.0, 1.0);
     // if not on the normal map draw attenuated shadows
-    if(normalColor.a == 0.0) {
+    if(normalColor.a <= 0.0) {
       //start with a dark color and add in the light color and shadow color
-      vec4 pixel = vec4(0.0, 0.0, 0.0, 1.0);
+      pixel = vec4(0.0, 0.0, 0.0, 1.0);
       if (lightGlow.x < 1.0 && lightGlow.y > 0.0) {
         pixel.rgb = clamp(lightColor * pow(att, lightSmooth) + pow(smoothstep(lightGlow.x, 1.0, att), lightSmooth) * lightGlow.y, 0.0, 1.0);
       } else {
         pixel.rgb = lightColor * pow(att, lightSmooth);
       }
-      //If on the shadow map add the shadow color
-      vec4 shadowColor = Texel(texture, texture_coords);
-      if(shadowColor.a > 0.0) {
-        pixel.rgb = pixel.rgb * shadowColor.rgb;
-      }
-      return pixel;
     } else {
+      vec3 normal = normalize(vec3(normalColor.r,invert_normal ? 1 - normalColor.g : normalColor.g, normalColor.b) * 2.0 - 1.0); 
       //on the normal map, draw normal shadows
       vec3 dir = vec3((lightPosition.xy - pixel_coords.xy) / love_ScreenSize.xy, lightPosition.z);
       dir.x *= love_ScreenSize.x / love_ScreenSize.y;
       vec3 diff = lightColor * max(dot(normalize(normal), normalize(dir)), 0.0);
       //return the light that is effected by the normal and attenuation
-      return vec4(diff * att, 1.0);
+      pixel = vec4(diff * att, 1.0);
     }
+
+    if(shadowColor.a > 0.0) {
+      pixel.rgb = pixel.rgb * shadowColor.rgb;
+    }
+    return pixel;
   }
 }