private bool PollReadable(int timeoutMs)
{
LibC.PollFd fd = new LibC.PollFd();
fd.fd = _drmFd;
fd.events = LibC.POLLIN | LibC.POLLPRI;
LibC.PollFd[] fds = new LibC.PollFd[] { fd };
int rc = LibC.Poll(fds, timeoutMs);
return(rc > 0);
}
public override void EnterMessageLoop(bool runInBackground)
{
bool running = true;
SizeChanged?.Invoke(this, _width, _height);
Activated?.Invoke(this);
IntPtr bo = Gbm.SurfaceLockFrontBuffer(_gbmSurface);
uint fb = GetFbForBo(bo);
IntPtr connectors = System.Runtime.InteropServices.Marshal.AllocHGlobal(sizeof(uint));
System.Runtime.InteropServices.Marshal.WriteInt32(connectors, (int)_drmConnectorId);
int rc = Drm.ModeSetCrtc(_drmFd, _drmEncoderCrtcId, fb, 0, 0, connectors, 1, ref _drmMode);
System.Runtime.InteropServices.Marshal.FreeHGlobal(connectors);
if (rc != 0)
{
throw new Exception("Failed to create DRM Mode");
}
while (running)
{
LibEvdev.HandleEvents();
Render?.Invoke(this);
IntPtr prevBo = bo;
bo = Gbm.SurfaceLockFrontBuffer(_gbmSurface);
fb = GetFbForBo(bo);
Drm.ModePageFlip(_drmFd, _drmEncoderCrtcId, fb, Drm.MODE_PAGE_FLIP_EVENT, IntPtr.Zero);
LibC.PollFd fd = new LibC.PollFd();
fd.fd = _drmFd;
fd.events = LibC.POLLIN | LibC.POLLPRI;
LibC.PollFd[] fds = new LibC.PollFd[] { fd };
LibC.Poll(fds, -1);
Drm.EventContext evctx = new Drm.EventContext();
evctx.version = 2;
Drm.HandleEvent(_drmFd, ref evctx);
if (prevBo != IntPtr.Zero)
{
Gbm.SurfaceReleaseBuffer(_gbmSurface, prevBo);
}
}
}
public GbmDisplay(string drmDevice)
{
_close = false;
IntPtr udev = LibUdev.New();
_drmFd = LibC.Open(drmDevice, LibC.O_RDWR);
if (_drmFd == -1)
{
IntPtr udevMonitor = LibUdev.MonitorNewFromNetlink(udev, "udev");
LibUdev.MonitorFilterAddMatchSubsystemDevtype(udevMonitor, "drm", null);
LibUdev.MonitorEnableReceiving(udevMonitor);
int udevMonitorFd = LibUdev.MonitorGetFd(udevMonitor);
LibC.PollFd fd = new LibC.PollFd();
fd.fd = udevMonitorFd;
fd.events = LibC.POLLIN | LibC.POLLPRI;
LibC.PollFd[] fds = { fd };
while (_drmFd == -1)
{
int rc = LibC.Poll(fds, -1);
if (rc > 0)
{
IntPtr device = LibUdev.MonitorReceiveDevice(udevMonitor);
if (device == IntPtr.Zero)
{
break;
}
IntPtr deviceAction = LibUdev.DeviceGetAction(device);
IntPtr deviceName = LibUdev.DeviceGetDevnode(device);
string devAction = System.Runtime.InteropServices.Marshal.PtrToStringAnsi(deviceAction);
if (devAction == "add")
{
_drmFd = LibC.Open(drmDevice, LibC.O_RDWR);
}
LibUdev.DeviceUnref(device);
}
}
LibUdev.MonitorUnref(udevMonitor);
}
LibUdev.Unref(udev);
IntPtr resourcesPtr = Drm.ModeGetResources(_drmFd);
Drm.ModeRes resources = System.Runtime.InteropServices.Marshal.PtrToStructure <Drm.ModeRes>(resourcesPtr);
for (int i = 0; i < resources.countConnectors; ++i)
{
uint connectorId = (uint)System.Runtime.InteropServices.Marshal.ReadInt32(resources.connectors, i * sizeof(uint));
IntPtr connectorPtr = Drm.ModeGetConnector(_drmFd, connectorId);
Drm.ModeConnector connector = System.Runtime.InteropServices.Marshal.PtrToStructure <Drm.ModeConnector>(connectorPtr);
if (connector.connection == Drm.MODE_CONNECTED)
{
_drmConnectorId = connector.connectorId;
int SizeOfDrmModeModeInfo = System.Runtime.InteropServices.Marshal.SizeOf <Drm.ModeModeInfo>();
int area = 0;
for (int j = 0; j < connector.countModes; ++j)
{
Drm.ModeModeInfo drmMode = System.Runtime.InteropServices.Marshal.PtrToStructure <Drm.ModeModeInfo>(IntPtr.Add(connector.modes, j * SizeOfDrmModeModeInfo));
if ((drmMode.type & Drm.MODE_TYPE_PREFERRED) != 0)
{
int modeArea = drmMode.hdisplay * drmMode.vdisplay;
if (modeArea > area)
{
_drmMode = drmMode;
_width = drmMode.hdisplay;
_height = drmMode.vdisplay;
area = modeArea;
}
}
}
for (int j = 0; j < resources.countEncoders; ++j)
{
uint encoderId = (uint)System.Runtime.InteropServices.Marshal.ReadInt32(resources.encoders, j * sizeof(uint));
IntPtr encoderPtr = Drm.ModeGetEncoder(_drmFd, encoderId);
Drm.ModeEncoder encoder = System.Runtime.InteropServices.Marshal.PtrToStructure <Drm.ModeEncoder>(encoderPtr);
for (int k = 0; k < resources.countCrtcs; ++k)
{
uint crtcMask = (uint)(1 << k);
if ((encoder.possibleCrtcs & crtcMask) != 0)
{
uint crtcId = (uint)System.Runtime.InteropServices.Marshal.ReadInt32(resources.crtcs, k * sizeof(uint));
_drmEncoderCrtcId = crtcId;
}
}
Drm.ModeFreeEncoder(encoderPtr);
}
break;
}
Drm.ModeFreeConnector(connectorPtr);
}
Drm.ModeFreeResources(resourcesPtr);
Drm.SetClientCap(_drmFd, Drm.CLIENT_CAP_UNIVERSAL_PLANES, 1);
_gbmDevice = Gbm.CreateDevice(_drmFd);
_gbmSurface = Gbm.SurfaceCreate(_gbmDevice, (uint)_width, (uint)_height, Drm.FORMAT_ARGB8888, Gbm.BO_USE_SCANOUT | Gbm.BO_USE_RENDERING);
_gbmBoToDrmFb = new Dictionary <IntPtr, uint>();
}