diff --git a/MAKE.bat b/MAKE.bat
index e87f0a6..942295a 100644
--- a/MAKE.bat
+++ b/MAKE.bat
@@ -370,6 +370,8 @@ if "%1"=="fwk" (
     copy/y ..\fwk-mirror\engine\fwk _fwk\engine\fwk
     copy/y ..\fwk-mirror\engine\split\*.inl _fwk\engine\split\
     copy/y ..\fwk-mirror\engine\art\shaders\* _fwk\engine\art\shaders\
+    copy/y ..\fwk-mirror\engine\art\fx\* _fwk\engine\art\fx\
+    copy/y ..\fwk-mirror\demos\art\fx\* _fwk\demos\art\fx\
     copy/y ..\fwk-mirror\tools\*.c _fwk\tools\
     copy/y ..\fwk-mirror\demos\*.c _fwk\demos\
     rem copy/y ..\fwk-mirror\engine\split\3rd_*.c _fwk\engine\split\
@@ -381,17 +383,22 @@ if "%1"=="fwk" (
 if "%1"=="fwk_prep" (
     if not exist "_fwk" mkdir "_fwk"
     if not exist "_fwk\demos" mkdir "_fwk\demos"
+    if not exist "_fwk\demos\art" mkdir "_fwk\demos\art"
+    if not exist "_fwk\demos\art\fx" mkdir "_fwk\demos\art\fx"
     if not exist "_fwk\tools" mkdir "_fwk\tools"
     if not exist "_fwk\tools\editor" mkdir "_fwk\tools\editor"
     if not exist "_fwk\engine" mkdir "_fwk\engine"
     if not exist "_fwk\engine\art" mkdir "_fwk\engine\art"
     if not exist "_fwk\engine\art\shaders" mkdir "_fwk\engine\art\shaders"
+    if not exist "_fwk\engine\art\fx" mkdir "_fwk\engine\art\fx"
     if not exist "_fwk\engine\split" mkdir "_fwk\engine\split"
     setlocal enabledelayedexpansion
     xcopy /y "*" "_fwk"
     xcopy /y "engine\split\3rd_*" "_fwk\engine\split"
     xcopy /y "engine\art\shaders\*" "_fwk\engine\art\shaders"
+    xcopy /y "engine\art\fx\*" "_fwk\engine\art\fx"
     xcopy /y "demos" "_fwk\demos"
+    xcopy /y "demos\art\fx" "_fwk\demos\art\fx"
     copy /y "engine\editor.c" "_fwk\engine\editor.c"
     copy /y "engine\v4k.c" "_fwk\engine\fwk.c"
     copy /y "engine\v4k.h" "_fwk\engine\fwk.h"
diff --git a/demos/art/fx/fxBlur.fs b/demos/art/fx/fxBlur.fs
index bf59569..54323a3 100644
--- a/demos/art/fx/fxBlur.fs
+++ b/demos/art/fx/fxBlur.fs
@@ -1,7 +1,7 @@
 // [ref] https://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
 
-uniform float intensity = 4; /// set:4
-uniform vec2  direction = vec2(1.0, 0.0); /// set:1,0
+uniform float intensity; /// set:4
+uniform vec2  direction; /// set:1,0
 
 void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
     vec2 uv = fragCoord.xy / iResolution.xy;