first commit

tonegen.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <SDL2/SDL.h>
+
+#define CHIPTUNE_EFFECT_NONE    0
+#define CHIPTUNE_EFFECT_SLIDE   1
+#define CHIPTUNE_EFFECT_VIBRATO 2
+#define CHIPTUNE_EFFECT_DROP    3
+#define CHIPTUNE_EFFECT_FADEIN  4
+#define CHIPTUNE_EFFECT_FADEOUT 5
+
+#define CHIPTUNE_INSTRUMENT_SAWTOOTH 0
+#define CHIPTUNE_INSTRUMENT_SQUARE   1
+#define CHIPTUNE_INSTRUMENT_TRIANGLE 2
+#define CHIPTUNE_INSTRUMENT_NOISE    3
+
+class toneGen {
+    public:
+        toneGen(const int note_length);
+        void setup(const uint8_t note, const uint8_t instrument, const uint8_t volume, const uint8_t effect);
+        void setup(const uint16_t tracker_note);
+        const int getSamples(const int numSamples, Sint16 *buffer);
+
+    private:
+        uint8_t note, instrument, volume, effect;
+        float nominal_volume, current_volume;
+        Sint16 df, old_df, f;
+        int note_length;
+        int current_pos;
+};