ibxm.Pattern Maven / Gradle / Ivy
package ibxm;
public class Pattern {
public int num_rows;
private int data_offset, note_index;
private byte[] pattern_data;
public Pattern() {
num_rows = 1;
set_pattern_data( new byte[ 0 ] );
}
public void set_pattern_data( byte[] data ) {
if( data != null ) {
pattern_data = data;
}
data_offset = 0;
note_index = 0;
}
public void get_note( int[] note, int index ) {
if( index < note_index ) {
note_index = 0;
data_offset = 0;
}
while( note_index <= index ) {
data_offset = next_note( data_offset, note );
note_index += 1;
}
}
public int next_note( int data_offset, int[] note ) {
int bitmask, field;
if( data_offset < 0 ) {
data_offset = pattern_data.length;
}
bitmask = 0x80;
if( data_offset < pattern_data.length ) {
bitmask = pattern_data[ data_offset ] & 0xFF;
}
if( ( bitmask & 0x80 ) == 0x80 ) {
data_offset += 1;
} else {
bitmask = 0x1F;
}
for( field = 0; field < 5; field++ ) {
note[ field ] = 0;
if( ( bitmask & 0x01 ) == 0x01 ) {
if( data_offset < pattern_data.length ) {
note[ field ] = pattern_data[ data_offset ] & 0xFF;
data_offset += 1;
}
}
bitmask = bitmask >> 1;
}
return data_offset;
}
}