diff --git a/rsc/shaders/filters/bloom.glsl b/rsc/shaders/filters/bloom.glsl
index ef735a1..ffd1455 100644
--- a/rsc/shaders/filters/bloom.glsl
+++ b/rsc/shaders/filters/bloom.glsl
@@ -1,7 +1,7 @@
 // from https://www.shadertoy.com/view/Ms2Xz3
 // Adapted by Bruno Herbelin for vimix
 
-float Intensity = 0.6;
+uniform float Intensity = 0.6;
 
 vec4 BlurColor (in vec2 Coord, in sampler2D Tex, in float MipBias)
 {
diff --git a/rsc/shaders/filters/bokeh.glsl b/rsc/shaders/filters/bokeh.glsl
index dbd0ff8..88b25b2 100644
--- a/rsc/shaders/filters/bokeh.glsl
+++ b/rsc/shaders/filters/bokeh.glsl
@@ -8,7 +8,7 @@
 #define GOLDEN_ANGLE 2.39996323
 #define ITERATIONS 60
 
-float Radius = 0.3;
+uniform float Radius = 0.3;
 
 mat2 rot = mat2(cos(GOLDEN_ANGLE), sin(GOLDEN_ANGLE), -sin(GOLDEN_ANGLE), cos(GOLDEN_ANGLE));
 
diff --git a/rsc/shaders/filters/dithering.glsl b/rsc/shaders/filters/dithering.glsl
index 5b32bb5..a620295 100644
--- a/rsc/shaders/filters/dithering.glsl
+++ b/rsc/shaders/filters/dithering.glsl
@@ -1,7 +1,7 @@
 // Ordered Dithering Shader https://www.shadertoy.com/view/4lSSRR
 // by mooglemoogle
 // Adapted by Bruno Herbelin for vimix
-float Factor = 0.5;
+uniform float Factor = 0.5;
 
 const float mult = 1.0 / 17.0;
 const mat4 adjustments = (mat4(
diff --git a/rsc/shaders/filters/earlybird.glsl b/rsc/shaders/filters/earlybird.glsl
index 6ff4735..61771f2 100644
--- a/rsc/shaders/filters/earlybird.glsl
+++ b/rsc/shaders/filters/earlybird.glsl
@@ -1,6 +1,6 @@
 /** 
  * Earlybird Filter by Ruofei Du (DuRuofei.com)
- * Demo: https://www.shadertoy.com/view/4lSyDK
+ * Demo: https://www.shadertoy.com/view/XlSyWV
  * starea @ ShaderToy,License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
  * https://creativecommons.org/licenses/by-nc-sa/3.0/
  * 
@@ -59,6 +59,8 @@ vec3 colorBurn(in vec3 s, in vec3 d )
 	return 1.0 - (1.0 - d) / s;
 }
 
+uniform float Contrast;
+
 void mainImage( out vec4 fragColor, in vec2 fragCoord )
 {
 	vec2 uv = fragCoord.xy / iResolution.xy;
@@ -79,7 +81,7 @@ void mainImage( out vec4 fragColor, in vec2 fragCoord )
     
     col = mix(tint * col, col, gradient); 
     col = colorBurn(grey, col); 
-    //col *= 0.8;
+    col *= Contrast + 0.5;
     fragColor = vec4(col, 1.0);
 }
 
diff --git a/rsc/shaders/filters/fisheye.glsl b/rsc/shaders/filters/fisheye.glsl
index a5cda09..256d2a3 100644
--- a/rsc/shaders/filters/fisheye.glsl
+++ b/rsc/shaders/filters/fisheye.glsl
@@ -1,7 +1,7 @@
 // from https://www.shadertoy.com/view/4s2GRR by SanchYESS
 // Inspired by http://stackoverflow.com/questions/6030814/add-fisheye-effect-to-images-at-runtime-using-opengl-es
 // Adapted by Bruno Herbelin for vimix
-float Factor = 0.4;
+uniform float Factor = 0.4;
 
 void mainImage( out vec4 fragColor, in vec2 fragCoord )
 {
diff --git a/rsc/shaders/filters/talk.glsl b/rsc/shaders/filters/talk.glsl
index 01513cd..0e29e9a 100644
--- a/rsc/shaders/filters/talk.glsl
+++ b/rsc/shaders/filters/talk.glsl
@@ -3,7 +3,7 @@
 // License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
 // Adapted by Bruno Herbelin for vimix
 
-float Factor = 0.5;
+uniform float Factor = 0.5;
 
 vec2 hash( vec2 p ) {
     p = 2.0 * vec2(dot(p,vec2(127.1,311.7)), dot(p,vec2(269.5,183.3)));