@@ -50,16 +50,19 @@ end

 local function append(angle)

     state.angle = angle % 360

-    local shader = os.tmpname()

-    mp.msg.debug("Writing", shader)

-    local file = io.open(shader, "w")

-    file:write(table.concat({

-        SHADER_META,

-        shader_define(),

-        SHADER_HOOK,

-    }, "\n"))

-    file:close()

-    mp.commandv("change-list", "glsl-shaders", "append", shader)

+    local shader = nil

+    if state.angle ~= 0 then

+        shader = os.tmpname()

+        mp.msg.debug("Writing", shader)

+        local file = io.open(shader, "w")

+        file:write(table.concat({

+            SHADER_META,

+            shader_define(),

+            SHADER_HOOK,

+        }, "\n"))

+        file:close()

+        mp.commandv("change-list", "glsl-shaders", "append", shader)

+    end

     remove()

     state.shader = shader

 end