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frednora/update_mouse_ok.c

Created January 23, 2019 13:37
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  1. frednora created this gist Jan 23, 2019.
    97 changes: 97 additions & 0 deletions update_mouse_ok.c
    View file
    Original file line number Diff line number Diff line change
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    // Credits:
    // Omar Mohammad. Maadi, Cairo, Egypt. (Original in Assembly)
    // Wagner Teixeira
    // Fred Nora

    //==================================================================================
    // Start - testing update_mouse
    //==================================================================================

    #define MOUSE_LEFT_BTN 0x01
    #define MOUSE_RIGHT_BTN 0x02
    #define MOUSE_MIDDLE_BTN 0x04
    #define MOUSE_X_SIGN 0x10
    #define MOUSE_Y_SIGN 0x20
    #define MOUSE_X_OVERFLOW 0x40
    #define MOUSE_Y_OVERFLOW 0x80

    long mouse_x = 0;
    long mouse_y = 0;

    char mouse_packet_data = 0;
    char mouse_packet_x = 0;
    char mouse_packet_y = 0;
    char mouse_packet_scroll = 0;

    /*
    * ;;=====================================================
    * ;; _update_mouse:
    * ;; Updates the mouse position.
    * ;;
    */

    void update_mouse ( void ){


    //======== X ==========
    //Testando o sinal de x.
    //Do the x pos first.
    do_x:

    //pega o delta x
    //testa o sinal para x

    if( mouse_packet_data & MOUSE_X_SIGN )
    {
    goto x_neg;
    }

    //Caso x seja positivo.
    x_pos:

    mouse_x += mouse_packet_x;
    goto do_y;

    //Caso x seja negativo.
    x_neg:
    mouse_x -= ( ~mouse_packet_x + 1 );

    if (mouse_x > 0)
    {
    goto do_y;
    }
    mouse_x = 0;

    //======== Y ==========
    //Testando o sinal de x.
    //Do the same for y position.
    do_y:

    //Pega o delta y.
    //Testa o sinal para y.
    if ( mouse_packet_data & MOUSE_Y_SIGN )
    {
    goto y_neg;
    }

    //Caso y seja positivo.
    y_pos:
    mouse_y -= mouse_packet_y;

    if ( mouse_y > 0 )
    {
    goto quit;
    }
    mouse_y = 0;
    goto quit;


    //Caso y seja negativo.
    y_neg:
    mouse_y += ( ~mouse_packet_y + 1 );

    quit:
    return;
    }