package example;

import sega.dreamcast.gdrom.GdromProtocol;
import sega.dreamcast.gdrom.G1IF;
import java.misc.Memory;

class GdromTest {
    static byte[] buf;

    static {
        buf = new byte[2048];
    }

    public static void g1_dma_start(int start_address, int transfer_length) {
        int gdstar = start_address & ~(0b111 << 29);
        int gdlen = (transfer_length + 31) & ~(31);

        Memory.putU4(G1IF.GDAPRO, 0x8843407F);
        Memory.putU4(G1IF.G1GDRC, 0x00001001);
        Memory.putU4(G1IF.GDSTAR, gdstar);
        Memory.putU4(G1IF.GDLEN, gdlen);
        Memory.putU4(G1IF.GDDIR, 1);
        Memory.putU4(G1IF.GDEN, 1);
        Memory.putU4(G1IF.GDST, 1);
    }

    public static void main() {
        // assume gdrom is already unlocked

        int data_track_fad = GdromProtocol.tocGetDataTrackFad();

        int primary_volume_descriptor = data_track_fad + 16;

        GdromProtocol.cdReadPIO(buf, primary_volume_descriptor, 1);

        System.out.println("data:");
        for (int i = 0; i < 16; i++) {
            System.out.print(buf[i]);
            System.out.print(' ');
        }
        System.out.println();
    }
}