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#include <string.h>
#include "common.h"
#include "gba-buttons.c"
#include "background-tiles.c"
#include "sprites.h"
#include "text.h"
//
// Main functions.
//
// TODO: Cleanup OBJ/OAM memory copying and access.
//
int main(void) {
// Configure the display in mode 0 to show OBJs, where tile memory is
// sequential.
DISP_CTRL = DISP_ENABLE_SPRITES | DISP_MODE_0 | DISP_BG_0;
// Initialize sprite button overlay.
init_sprite_pal(0, COLOR_WHITE);
init_sprites(0);
init_button_sprites();
// Initialize text engine.
txt_init(0, COLOR_RED, 0);
// Register interrupts.
irq_init();
irs_set(IRQ_VBLANK, irs_stub);
// turn sound on
SOUND_STATUS = SOUND_ENABLE;
SOUND_DMG_MASTER = sound_volume(SOUND_SQUARE1 | SOUND_SQUARE2, 7);
SOUND_DSOUND_MASTER = SOUND_DMG100;
int frame_counter = 0;
Note active_note = NOTE_C_4;
int octave_diff = 0;
bool playing = false;
bool new_note = false;
u8 interval = 4;
while(true) {
bios_vblank_wait();
poll_keys();
txt_position(0, 1);
txt_clear_line();
if (key_pressed(KEY_B)) {
active_note = NOTE_C_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_A)) {
active_note = NOTE_D_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_LEFT)) {
active_note = NOTE_E_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_DOWN)) {
active_note = NOTE_F_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_RIGHT)) {
active_note = NOTE_G_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_UP)) {
active_note = NOTE_A_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_L)) {
active_note = NOTE_B_4 + 12 * octave_diff;
new_note = true;
} else if (key_pressed(KEY_R)) {
active_note = NOTE_C_5 + 12 * octave_diff;
new_note = true;
}
if (key_pressed(KEY_START)) {
octave_diff = CLAMP(octave_diff + 1, -2, 3);
}
if (key_pressed(KEY_SELECT)) {
octave_diff = CLAMP(octave_diff - 1, -2, 3);
}
if (key_curr > 0) {
txt_printf(" Playing: %s\n", note_names[active_note]);
playing = true;
} else {
playing = false;
}
if (playing) {
if (new_note) {
// SOUND_SQUARE1_SWEEP = 3 | (1 << 3) | (2 << 4);
// SOUND_SQUARE1_CTRL = SOUND_SQUARE_ENV_VOL(15) | SOUND_SQUARE_ENV_TIME(0x7);
// SOUND_SQUARE2_CTRL = SOUND_SQUARE_ENV_VOL(15) | SOUND_SQUARE_ENV_TIME(0);
SOUND_SQUARE1_CTRL = SOUND_SQUARE_ENV_VOL(15) | SOUND_SQUARE_ENV_TIME(4) | SOUND_SQUARE_ENV_INC | SOUND_SQUARE_DUTY(3);
// SOUND_SQUARE2_CTRL = SOUND_SQUARE_ENV_VOL(15) | SOUND_SQUARE_ENV_TIME(4) | SOUND_SQUARE_ENV_INC;
SOUND_SQUARE1_FREQ = SOUND_SQUARE_RESET | sound_rates[active_note];
// SOUND_SQUARE2_FREQ = SOUND_SQUARE_RESET | sound_rate((active_note + interval) % 12, octave);
}
new_note = false;
} else {
SOUND_SQUARE1_CTRL = SOUND_SQUARE_ENV_VOL(0) | SOUND_SQUARE_ENV_TIME(0);
SOUND_SQUARE2_CTRL = SOUND_SQUARE_ENV_VOL(0) | SOUND_SQUARE_ENV_TIME(0);
SOUND_SQUARE1_FREQ = 0;
SOUND_SQUARE2_FREQ = 0;
}
frame_counter++;
update_button_sprites();
};
return 0;
}
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