diff --git a/examples/wavy.glsl b/examples/wavy.glsl
index 2c5a3a0..af67ee9 100644
--- a/examples/wavy.glsl
+++ b/examples/wavy.glsl
@@ -24,9 +24,15 @@ void mainImage(out vec4 fragColor, in vec2 fragCoord) {
     lines_uv.y += sin(lines_timescale * 0.2 + lines_uv.x * 5.0) * 0.2;
     lines_uv.x += sin(lines_timescale + lines_uv.y * 30.0) * 0.2;// * sin(lines_timescale);
     float hor_lines = sin(lines_uv.x * 10.0)/2.0 + 0.5;
-    hor_lines = sign(hor_lines -0.5);
+    float extra_hor_lines = hor_lines;
+    // clipped with AA
+    hor_lines = extra_hor_lines; //sign(hor_lines -0.5);
+
     //hor_lines = sin(iTime * 3.0 +hor_lines * 2.0 + uv.y / 50.0);
 
+    
+
     //fragColor = vec4(uv.x, uv.y, 1.0, 1.0);
-    fragColor = vec4(hor_lines * 0.7, inverse_distance * 0.55, inverse_distance * 0.75, 1.0);
+    float frac = 0.50;
+    fragColor = vec4(hor_lines * frac, hor_lines * frac, hor_lines * frac + 0.4, 1.0);
 }
diff --git a/flake.nix b/flake.nix
index 018044f..570f289 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,6 +22,8 @@
           ];
           buildInputs = with pkgs; [
             libGL
+            libpng
+            libjpeg
           ];
           makeFlags = [ "PREFIX=$(out)" ];
         };
diff --git a/renderer.c b/renderer.c
index ed7c345..d8459ac 100644
--- a/renderer.c
+++ b/renderer.c
@@ -3,8 +3,10 @@
 #include <string.h>
 #include <GL/gl.h>
 #include <stdlib.h>
+#include <libpng16/png.h>
 #include "renderer.h"
 
+
 /// returns 0 if failed.
 GLuint compile_shader(GLuint type, const char *src) {
     GLuint id = glCreateShader(type);