added stencils

lib/init.lua

@@ -78,6 +78,10 @@ function light_world:refreshScreenSize(w, h)
 	self.refractionMap    = love.graphics.newCanvas(w, h)
 	self.reflectionMap    = love.graphics.newCanvas(w, h)
 
+  for i = 1, #self.lights do
+    self.lights[i]:refresh()
+  end
+
   self.post_shader:refreshScreenSize(w, h)
 end
 
@@ -149,26 +153,18 @@ function light_world:drawShadows(l,t,w,h,s)
   for i = 1, #self.lights do
     local light = self.lights[i]
     if light:isVisible() then
+      light:updateShadowMap(l, t, s, self.bodies)
       self.shineShader:send('lightColor', {light.red / 255.0, light.green / 255.0, light.blue / 255.0})
       self.shineShader:send("lightPosition", {(light.x + l/s) * s, (h/s - (light.y + t/s)) * s, (light.z * 10) / 255.0})
       self.shineShader:send('lightRange',  light.range * s)
       self.shineShader:send("lightSmooth", light.smooth)
       self.shineShader:send("lightGlow", {1.0 - light.glowSize, light.glowStrength})
       self.shineShader:send('AmbientColor',{self.ambient[1] / 255, self.ambient[2] / 255, self.ambient[3] / 255, 0.2})
-      util.process(self.shadowMap, {
+      util.drawCanvasToCanvas(light.shadowMap, self.shadowMap, {
         blendmode = 'additive',
         shader = self.shineShader,
-        istencil = function()
-          love.graphics.translate(l, t)
-          love.graphics.scale(s)
-          for k = 1, #self.bodies do
-            if self.bodies[k]:isInLightRange(light) and self.bodies[k]:isVisible() then
-              self.bodies[k]:drawShadow(light)
-            end
-          end
-          local angle = math.pi - light.angle / 2.0
-          love.graphics.setColor(0, 0, 0)
-          love.graphics.arc("fill", light.x, light.y, light.range, light.direction - angle, light.direction + angle)
+        stencil = function()
+          love.graphics.circle("fill", light.x, light.y, light.range)
         end
       })
     end

lib/light.lua

@@ -1,5 +1,6 @@
 local _PACKAGE = (...):match("^(.+)[%./][^%./]+") or ""
 local class = require(_PACKAGE.."/class")
+local util = require(_PACKAGE.."/util")
 
 local light = class()
 
@@ -18,6 +19,11 @@ function light:init(x, y, r, g, b, range)
 	self.glowStrength = 0.0
 	self.visible = true
   self.is_on_screen = true
+  self:refresh(love.window.getWidth(), love.window.getHeight())
+end
+
+function light:refresh(w, h)
+	self.shadowMap = love.graphics.newCanvas(w, h)
 end
 
 -- set position
@@ -117,4 +123,18 @@ function light:isVisible()
   return self.visible and self.is_on_screen
 end
 
+function light:updateShadowMap(l, t, s, bodies)
+  self.shadowMap:clear()
+  util.drawto(self.shadowMap, l, t, s, function()
+    for k = 1, #bodies do
+      if bodies[k]:isInLightRange(self) and bodies[k]:isVisible() then
+        bodies[k]:drawShadow(self)
+      end
+    end
+    local angle = math.pi - self.angle / 2.0
+    love.graphics.setColor(0, 0, 0)
+    love.graphics.arc("fill", self.x, self.y, self.range, self.direction - angle, self.direction + angle)
+  end)
+end
+
 return light

lib/shaders/shine.glsl

@@ -9,6 +9,10 @@ extern vec2  lightGlow     = vec2(0.5, 0.5); //how brightly the light bulb part
 extern vec4  AmbientColor;                   //ambient RGBA -- alpha is intensity 
 
 vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
+  vec4 pixelColor = Texel(texture, texture_coords);
+  if(pixelColor.a > 0){
+    return pixelColor;
+  } else {
     float dist = distance(lightPosition, vec3(pixel_coords, 1.0));
     //if the pixel is within this lights range
     //calculater attenuation of light based on the distance
@@ -18,4 +22,5 @@ vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
     vec3 pixel = lightColor * pow(att, lightSmooth) + pow(smoothstep(lightGlow.x, 1.0, att), lightSmooth) * lightGlow.y;
     return vec4(Ambient + pixel, 1.0);
   }
+}
 

lib/util.lua

@@ -15,7 +15,7 @@ function util.drawCanvasToCanvas(canvas, other_canvas, options)
       love.graphics.setShader(options["shader"])
     end
     if options["stencil"] then
-      love.graphics.setInvertedStencil(options["stencil"])
+      love.graphics.setStencil(options["stencil"])
     end
     if options["istencil"] then
       love.graphics.setInvertedStencil(options["istencil"])
@@ -33,7 +33,7 @@ function util.drawCanvasToCanvas(canvas, other_canvas, options)
       love.graphics.setShader()
     end
     if options["stencil"] then
-      love.graphics.setInvertedStencil()
+      love.graphics.setStencil()
     end
     if options["istencil"] then
       love.graphics.setInvertedStencil()