Add fft

src/shaders/fragment.frag

@@ -3,6 +3,7 @@ precision mediump float;
 out vec4 o;
 const float PI = 22./7.;
 layout(location = 0) uniform float syncs[7];
+layout(location = 8) uniform float fft_output[512]; // FFT_SIZE / 4
 float u_time = syncs[0];
 
 vec3 render(vec2 uv, float time) {
@@ -23,5 +24,18 @@ vec3 render(vec2 uv, float time) {
 void main() {
   	vec2 uv = gl_FragCoord.xy * 2. / vec2(1920,1080);
     vec3 col = render(uv, u_time);
-    o = vec4(col,1.0);
+    
+    // Determine FFT bin index for current x position
+    int index = int(floor(uv.x*128.0));
+    index = clamp(index, 0, 255);
+
+    // Get the FFT energy (clamped to avoid NaNs or overflow)
+    float energy = clamp(fft_output[index], .0, 1.0);
+
+    float bar_height = energy;
+    float fade = smoothstep(bar_height, bar_height + 0.02, 1.0 - uv.y);
+
+    vec3 color = vec3(fade);
+
+    o = vec4(color, 1.0);
 }

src/shaders/fragment.inl

@@ -1,6 +1,7 @@
 // Generated with Shader Minifier 1.5.1 (https://github.com/laurentlb/Shader_Minifier/)
 #ifndef FRAGMENT_INL_
 # define FRAGMENT_INL_
+# define VAR_fft_output "l"
 # define VAR_o "f"
 # define VAR_syncs "v"
 
@@ -10,20 +11,13 @@ const char *fragment_frag =
  "out vec4 f;"
  "const float m=22./7.;"
  "layout(location=0)uniform float v[7];"
+ "layout(location=8)uniform float l[512];"
  "float n=v[0];"
- "vec3 s(vec2 f)"
- "{"
-   "float m=v[4];"
-   "return f.x>=m&&f.x<=m+.01?"
-     "vec3(1):"
-     "f.x>=0.&&f.x<=.01?"
-       "vec3(abs(v[3]*2)):"
-       "vec3(.1,.2,.3)*abs(v[1]*1.2);"
- "}"
  "void main()"
  "{"
    "vec2 m=gl_FragCoord.xy*2./vec2(1920,1080);"
-   "f=vec4(s(m),1);"
+   "float n=clamp(l[clamp(int(floor(m.x*128.)),0,255)],0.,1.);"
+   "f=vec4(vec3(smoothstep(n,n+.02,1.-m.y)),1);"
  "}";
 
 #endif // FRAGMENT_INL_