Fixing audio glitches with wave and noise channels

include/audio.h

@@ -99,6 +99,24 @@ typedef struct {
 
     u8 wave_ram[16];
 
+    float sq1_history[4410];
+    u32 sq1_index;
+
+    float sq2_history[4410];
+    u32 sq2_index;
+
+    float ch3_history[4410];
+    u32 ch3_index;
+
+    float ch4_history[4410];
+    u32 ch4_index;
+
+    float left_history[4410];
+    u32 left_index;
+
+    float right_history[4410];
+    u32 right_index;
+
 } audio_context;
 
 void audio_init();
@@ -106,4 +124,6 @@ void audio_tick();
 void audio_period_tick();
 
 u8 audio_read(u16 address);
-void audio_write(u16 address, u8 value);
+void audio_write(u16 address, u8 value);
+
+audio_context *audio_get_context();