diff --git a/Makefile b/Makefile
index 199560b..ceaff96 100644
--- a/Makefile
+++ b/Makefile
@@ -19,4 +19,4 @@ build: forge-steel/build/forge
 
 .PHONY: run
 run:
-	LIBGL_ALWAYS_SOFTWARE=true forge-steel/build/forge $(RUN_ARGS)
+	forge-steel/build/forge $(RUN_ARGS)
diff --git a/project/frag7.glsl b/project/frag7.glsl
index 7b190d6..8751d4b 100644
--- a/project/frag7.glsl
+++ b/project/frag7.glsl
@@ -6,10 +6,15 @@ in vec2 vUV;
 out vec4 fragColor;
 
 #include inc_functions.glsl
+#include inc_cp437.glsl
 
 uniform sampler2D iTex0;
+uniform int iFPS;
 
 void main() {
-    vec3 c = gauss(iTex0, vUV, 3, 2 / max(iResolution.x, iResolution.y)).xyz;
+    vec2 uv = vec2(vUV.x, 1 - vUV.y);
+    // vec2 uv = vUV;
+    vec3 c = gauss(iTex0, uv, 3, 2 / max(iResolution.x, iResolution.y)).xyz;
+    c = mix(c, 1 - c, write_int(uv * 20, vec2(0.1, 0.1), iFPS, 2));
     fragColor = vec4(c, 1);
 }