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