diff --git a/lib/postshader.lua b/lib/postshader.lua
index ee55f55..088a9e3 100644
--- a/lib/postshader.lua
+++ b/lib/postshader.lua
@@ -27,12 +27,13 @@ local util = require(_PACKAGE..'/util')
 local post_shader = {}
 post_shader.__index = post_shader
 
-local files = love.filesystem.getInfo(_PACKAGE .. "/shaders/postshaders")
+local files = love.filesystem.getDirectoryItems(_PACKAGE .. "/shaders/postshaders")
 local shaders = {}
 
 for i,v in ipairs(files) do
   local name = _PACKAGE.."/shaders/postshaders".."/"..v
-  if love.filesystem.isFile(name) then
+  inf = love.filesystem.getInfo(name)
+  if love.filesystem.getInfo(name).type == "file" then
     local str = love.filesystem.read(name)
     local effect = util.loadShader(name)
     local defs = {}
diff --git a/lib/shaders/postshaders/phosphor.glsl b/lib/shaders/postshaders/phosphor.glsl
index b799f9c..d2c1264 100644
--- a/lib/shaders/postshaders/phosphor.glsl
+++ b/lib/shaders/postshaders/phosphor.glsl
@@ -21,6 +21,7 @@
 
 // 0.5 = the spot stays inside the original pixel
 // 1.0 = the spot bleeds up to the center of next pixel
+
 #define PHOSPHOR_WIDTH  0.9
 #define PHOSPHOR_HEIGHT 0.65
 
@@ -33,7 +34,7 @@
 
 // Uncomment to only draw every third pixel, which highlights the shape
 // of individual (remaining) spots.
-// #define DEBUG
+//#define DEBUG
 
 // Uncomment one of these to choose a gamma correction method.
 // If none are uncommented, no gamma correction is done.
@@ -61,6 +62,8 @@ vec4 A_IN = vec4( 12.0/(InputGamma+1.0)-3.0 );
 vec4 B_IN = vec4(1.0) - A_IN;
 vec4 A_OUT = vec4(6.0 - 15.0 * OutputGamma / 2.0 / (OutputGamma+1.0));
 vec4 B_OUT = vec4(1.0) - A_OUT;
+uniform Image _tex0_;
+
 #define GAMMA_IN(color)     ( (A_IN + B_IN * color) * color * color )
 #define GAMMA_OUT(color)    ( A_OUT * sqrt(color) + B_OUT * sqrt( sqrt(color) ) )
 
@@ -78,7 +81,7 @@ vec4 B_IN = vec4(1.0) - A_IN;
 #ifdef DEBUG
 vec4 grid_color( vec2 coords )
 {
-		vec2 snes = floor( coords * love_ScreenSize );
+		vec2 snes = floor( coords * love_ScreenSize.xy );
 		if ( (mod(snes.x, 3.0) == 0.0) && (mod(snes.y, 3.0) == 0.0) )
 				return texture2D(_tex0_, coords);
 		else
diff --git a/lib/util.lua b/lib/util.lua
index 26fab60..d4fad45 100644
--- a/lib/util.lua
+++ b/lib/util.lua
@@ -13,7 +13,7 @@ function util.drawCanvasToCanvas(canvas, other_canvas, options)
 
   util.drawto(other_canvas, 0, 0, 1, function()
     if options["blendmode"] then
-      love.graphics.setBlendMode(options["blendmode"])
+      love.graphics.setBlendMode(options["blendmode"], "premultiplied")
     end
     if options["shader"] then
       love.graphics.setShader(options["shader"])
@@ -60,6 +60,7 @@ function util.drawto(canvas, x, y, scale, cb)
 end
 
 function util.loadShader(name)
+    print("loading:", name)
   local shader = ""
   local externInit = {}
   for line in love.filesystem.lines(name) do
diff --git a/main.lua b/main.lua
index 0fe66b2..f4aba07 100644
--- a/main.lua
+++ b/main.lua
@@ -27,7 +27,7 @@ function love.load()
 	local n = 0
 
   for i, v in ipairs(files) do
-    is_file = love.filesystem.isFile("examples/".. v )
+    is_file = (love.filesystem.getInfo("examples/".. v ).type == "file")
     if is_file then
       n = n + 1
       table.insert(exf.available, v);
@@ -292,13 +292,13 @@ function List:mousepressed(mx, my, b)
 
 	  if b == "wd" then
 	    self.bar_pos = self.bar_pos + bar_pixel_dt
-	    if self.bar_pos > self.bar_max_pos then 
-        self.bar_pos = self.bar_max_pos 
+	    if self.bar_pos > self.bar_max_pos then
+        self.bar_pos = self.bar_max_pos
       end
 	  elseif b == "wu" then
 	    self.bar_pos = self.bar_pos - bar_pixel_dt
-	    if self.bar_pos < 0 then 
-        self.bar_pos = 0 
+	    if self.bar_pos < 0 then
+        self.bar_pos = 0
       end
 	  end
   end
@@ -344,9 +344,9 @@ function List:draw()
   -- Get interval to display.
   local start_i = math.floor( self:getOffset()/(self.item_height+1) ) + 1
   local end_i = start_i+math.floor( self.height/(self.item_height+1) ) + 1
-  
-  if end_i > self.items.n then 
-    end_i = self.items.n 
+
+  if end_i > self.items.n then
+    end_i = self.items.n
   end
 
   love.graphics.setScissor(self.x, self.y, self.width, self.height)