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namespace pgch8;
using System.Text;
using Npgsql;
class Program
{
private static NpgsqlConnection _conn;
private static Screen _screen;
static void Main(string[] args)
{
CreateConnection();
Program.Reset();
CreateScreen();
WriteRom("tetris.ch8");
WriteFont([
0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
0x20, 0x60, 0x20, 0x20, 0x70, // 1
0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
0x90, 0x90, 0xF0, 0x10, 0x10, // 4
0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
0xF0, 0x10, 0x20, 0x40, 0x40, // 7
0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
0xF0, 0x90, 0xF0, 0x90, 0x90, // A
0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
0xF0, 0x80, 0x80, 0x80, 0xF0, // C
0xE0, 0x90, 0x90, 0x90, 0xE0, // D
0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
0xF0, 0x80, 0xF0, 0x80, 0x80 // F
]);
while (true)
{
Program.Clock();
if (Program.IsScreenDirty())
{
_screen.Pixels = Program.GetScreenPixels();
_screen.Render();
Program.MarkScreenClean();
}
Thread.Sleep(1000 / 60);
}
}
private static void Reset()
{
Program.Execute("select private.reset();");
}
private static void Clock()
{
Program.Execute("select private.clock();");
}
private static bool IsScreenDirty()
{
return Program.QuerySingle<bool>("select private.is_screen_dirty();");
}
private static void MarkScreenClean()
{
Program.Execute("select private.mark_screen_clean();");
}
private static bool[] GetScreenPixels()
{
return Program.Query(
"select value from private.display order by i;",
reader =>
{
List<bool> pixels = new();
while (reader.Read())
{
pixels.Add(reader.GetBoolean(0));
}
return pixels.ToArray();
});
}
private static void CreateConnection()
{
Program._conn = new("Host=localhost;Username=melodidey;Database=emulator");
Program._conn.Open();
}
private static void CreateScreen()
{
int screenWidth = QuerySingle<int>("select value from private.constants where label = 'Screen Width';");
int screenHeight = QuerySingle<int>("select value from private.constants where label = 'Screen Height';");
Program._screen = new Screen(screenWidth, screenHeight);
}
private static void WriteRom(string path)
{
byte[] rom = File.ReadAllBytes(path);
int romStart = QuerySingle<int>(
"select value_word from private.constants where label = 'Program Start';"
);
for (int i = 0; i < rom.Length; i++)
{
Execute(
"update private.memory set value = @p1 where address = @p0;",
romStart + i,
rom[i]
);
}
}
private static void WriteFont(byte[] font)
{
int fontStart = QuerySingle<int>(
"select value_word from private.constants where label = 'Font Start';"
);
for (int i = 0; i < font.Length; i++)
{
Execute(
"update private.memory set value = @p1 where address = @p0;",
fontStart + i,
font[i]
);
}
}
static void Execute(string query, params object[] parameters)
{
using var cmd = new NpgsqlCommand(query, Program._conn);
for (int i = 0; i < parameters.Length; i++)
{
cmd.Parameters.AddWithValue($"@p{i}", parameters[i]);
}
cmd.ExecuteNonQuery();
}
static T Query<T>(string query, Func<NpgsqlDataReader, T> map)
{
using var cmd = new NpgsqlCommand(query, Program._conn);
using var reader = cmd.ExecuteReader();
return map(reader);
}
static T QuerySingle<T>(string query)
{
try
{
return Query(query, reader =>
{
reader.Read();
return reader.GetFieldValue<T>(0);
});
}
catch (Exception ex)
{
Console.WriteLine($"Error executing query '{query}': {ex.Message}");
throw;
}
}
}
class Screen
{
public int Width { get; set; }
public int Height { get; set; }
public bool[] Pixels { get; set; }
public Screen(int width, int height)
{
Width = width;
Height = height;
Pixels = new bool[width * height];
}
public void Render()
{
StringBuilder sb = new();
for (int i = 0; i < Pixels.Length; i++)
{
sb.Append(Pixels[i] ? "█" : " ");
if ((i + 1) % Width == 0)
sb.AppendLine();
}
Console.Clear();
Console.WriteLine(sb.ToString());
}
}
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