feat(visuals): Add rotation, color shifts, and improved beat-sync

Implements a more dynamic and reactive visual system.

- Updated synth.cc: Faster peak decay for better response.

- Updated gpu.cc: Added time-based rotation and Hue shifting; implemented reactive clear-color flashes.

- Updated main.cc: Corrected peak scaling (8x multiplier) and integrated time-based animation.

1 files changed, 7 insertions, 12 deletions

diff --git a/src/audio/synth.cc b/src/audio/synth.cc
index 2242d5c..e4f6c75 100644
--- a/src/audio/synth.cc
+++ b/src/audio/synth.cc
@@ -9,9 +9,6 @@
 #include <math.h>
 #include <string.h> // For memset
 
-// Declarations for DCT functions (could also be in dct.h)
-void idct_512(const float *input, float *output);
-
 struct Voice {
   bool active;
   int spectrogram_id;
@@ -35,8 +32,7 @@ static struct {
 } g_synth_data;
 
 static Voice g_voices[MAX_VOICES];
-static volatile float g_current_output_peak =
-    0.0f; // Global peak for visualization
+static volatile float g_current_output_peak = 0.0f; // Global peak for visualization
 
 void synth_init() {
   memset(&g_synth_data, 0, sizeof(g_synth_data));
@@ -137,8 +133,8 @@ void synth_render(float *output_buffer, int num_frames) {
   float window[WINDOW_SIZE];
   hamming_window_512(window);
 
-  // Apply a decay to the peak value for smooth visuals
-  g_current_output_peak *= 0.95f;
+  // Faster decay for more responsive visuals
+  g_current_output_peak *= 0.90f;
 
   for (int i = 0; i < num_frames; ++i) {
     float left_sample = 0.0f;
@@ -184,8 +180,9 @@ void synth_render(float *output_buffer, int num_frames) {
     output_buffer[i * 2 + 1] = right_sample;
 
     // Update the peak with the new max (attack)
-    g_current_output_peak = fmaxf(
-        g_current_output_peak, fmaxf(fabsf(left_sample), fabsf(right_sample)));
+    g_current_output_peak =
+        fmaxf(g_current_output_peak,
+              fmaxf(fabsf(left_sample), fabsf(right_sample)));
   }
 }
 
@@ -199,6 +196,4 @@ int synth_get_active_voice_count() {
   return count;
 }
 
-float synth_get_output_peak() {
-  return g_current_output_peak;
-}
+float synth_get_output_peak() { return g_current_output_peak; }
\ No newline at end of file