public byte WaitForKey()
{
bool success;
success = WinApi.FlushConsoleInputBuffer(ConsoleInputHandle);
if (!success)
{
throw new Exception($"Cannot wait on key - FlushConsoleInputBuffer failed: {new Win32Exception(Marshal.GetLastWin32Error()).Message}");
}
var inputRecords = new WinApi.INPUT_RECORD[1];
while (true)
{
uint numEventsRead;
success = WinApi.ReadConsoleInput(ConsoleInputHandle, inputRecords, 1, out numEventsRead);
if (!success || numEventsRead != 1)
{
throw new Exception($"Cannot wait on key - ReadConsoleInput failed: {new Win32Exception(Marshal.GetLastWin32Error()).Message}");
}
if (inputRecords[0].EventType == WinApi.KEY_EVENT)
{
var keyEvent = inputRecords[0].KeyEvent;
// Only care about events for the 16 Chip-8 (COSMAC-VIP) Keys, ignore everything else
// Also filter out keys that are repeated (already being held down), we want first hits only
// TODO: The filtering out repeated of already-pressed keys isn't working, Windows just sends key down events
// with a repeat count of 1 while holding down a key :(
if (keyEvent.bKeyDown && keyEvent.wRepeatCount == 1 && WindowsVirtualScanCodeIsChip8Key(keyEvent.wVirtualScanCode))
{
return(WindowsVirtualScanCodeToChip8Key(keyEvent.wVirtualScanCode));
}
}
}
}
/// <summary>
/// Process console input events to record which CHIP-8 keys are held down or not.
/// </summary>
public void ProcessInputEvents()
{
bool success;
var inputRecords = new WinApi.INPUT_RECORD[1];
while (true)
{
uint numEvents;
success = WinApi.GetNumberOfConsoleInputEvents(ConsoleInputHandle, out numEvents);
if (!success)
{
throw new Exception($"Cannot process key input events - GetNumberOfConsoleInputEvents failed: {new Win32Exception(Marshal.GetLastWin32Error()).Message}");
}
if (numEvents == 0)
{
break;
}
uint numEventsRead;
success = WinApi.ReadConsoleInput(ConsoleInputHandle, inputRecords, 1, out numEventsRead);
if (!success || numEventsRead != 1)
{
throw new Exception($"Cannot process key input events - ReadConsoleInput failed: {new Win32Exception(Marshal.GetLastWin32Error()).Message}");
}
if (inputRecords[0].EventType == WinApi.KEY_EVENT)
{
var keyEvent = inputRecords[0].KeyEvent;
// Only care about events for the 16 Chip-8 (COSMAC-VIP) Keys, ignore everything else
if (WindowsVirtualScanCodeIsChip8Key(keyEvent.wVirtualScanCode))
{
var chip8Key = WindowsVirtualScanCodeToChip8Key(keyEvent.wVirtualScanCode);
KeyPressStates[chip8Key] = keyEvent.bKeyDown;
}
}
}
}
