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#include "config.h"
#include "sound.h"
#if DEBUG
#include "error.h"
#include "platform.h"
#endif
typedef struct {
int pitch;
int length;
} Beep;
static struct {
unsigned t;
Song song;
Beep beeps[max_beeps];
int beep_count;
} sys;
typedef unsigned char (*Song_Func)(unsigned t);
static unsigned char menu_song(unsigned t) {
return 0;
}
static unsigned char main_song(unsigned t) {
/* From tejeez 2011-10-05
* I didn't have time to make my own music PepeHands */
return (~t>>2)*((127&t*(7&t>>10))<(245&t*(2+(5&t>>14))));
}
static unsigned char dead_song(unsigned t) {
return 0;
}
static unsigned char win_song(unsigned t) {
return 0;
}
void init_sound() {
sys.t = 0;
sys.song = song_menu;
}
void set_song(Song song) {
sys.song = song;
sys.t = 0;
}
Song_Func get_current_song_f() {
switch (sys.song) {
case song_menu:
return menu_song;
case song_main:
return main_song;
case song_win:
return win_song;
case song_dead:
return dead_song;
}
return 0;
}
void play_beep(int pitch, int length) {
Beep* beep;
#if DEBUG
if (sys.beep_count >= max_beeps) {
platform_err("Too many beeps.\n");
platform_abort(error_sound_error);
}
#endif
beep = &sys.beeps[sys.beep_count++];
beep->pitch = pitch;
beep->length = length;
}
void sound_mix(unsigned char* stream, int len) {
int i, j;
Song_Func f;
Beep* beep;
f = get_current_song_f();
for (i = 0; i < len; i++) {
/* stream[i] = sys.t % 50;*/
stream[i] = 0;
stream[i] = f(sys.t) / 2;
for (j = sys.beep_count - 1; j >= 0; j--) {
beep = &sys.beeps[j];
stream[i] |= (sys.t % beep->pitch) * 5;
beep->length--;
if (beep->length <= 0) {
if (sys.beep_count > 1) {
*beep = sys.beeps[sys.beep_count - 1];
}
sys.beep_count--;
}
}
sys.t++;
}
}
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