private unsafe void UpdateMonitors()
{
if (p_sdl_GetNumVideoDisplays == null)
{
p_sdl_GetNumVideoDisplays = Sdl2Native.LoadFunction <SDL_GetNumVideoDisplays_t>("SDL_GetNumVideoDisplays");
}
if (p_sdl_GetDisplayUsableBounds_t == null)
{
p_sdl_GetDisplayUsableBounds_t = Sdl2Native.LoadFunction <SDL_GetDisplayUsableBounds_t>("SDL_GetDisplayUsableBounds");
}
ImGuiPlatformIOPtr plIo = ImGui.GetPlatformIO();
Marshal.FreeHGlobal(plIo.NativePtr->Monitors.Data);
int numMonitors = p_sdl_GetNumVideoDisplays();
IntPtr data = Marshal.AllocHGlobal(Unsafe.SizeOf <ImGuiPlatformMonitor>() * numMonitors);
plIo.NativePtr->Monitors = new ImVector(numMonitors, numMonitors, data);
for (int i = 0; i < numMonitors; i++)
{
Rectangle r;
p_sdl_GetDisplayUsableBounds_t(i, &r);
ImGuiPlatformMonitorPtr monitor = plIo.Monitors[i];
monitor.DpiScale = 1f;
monitor.MainPos = new Vector2(r.X, r.Y);
monitor.MainSize = new Vector2(r.Width, r.Height);
monitor.WorkPos = new Vector2(r.X, r.Y);
monitor.WorkSize = new Vector2(r.Width, r.Height);
}
}
public void SwapExtraWindows(GraphicsDevice gd)
{
ImGuiPlatformIOPtr platformIO = ImGui.GetPlatformIO();
for (int i = 1; i < platformIO.Viewports.Size; i++)
{
ImGuiViewportPtr vp = platformIO.Viewports[i];
VeldridImGuiWindow window = (VeldridImGuiWindow)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
gd.SwapBuffers(window.Swapchain);
}
}
/// <summary>
/// Sets per-frame data based on the associated window.
/// This is called by Update(float).
/// </summary>
private void SetPerFrameImGuiData(float deltaSeconds)
{
ImGuiIOPtr io = ImGui.GetIO();
io.DisplaySize = new Vector2(
_windowWidth / _scaleFactor.X,
_windowHeight / _scaleFactor.Y);
io.DisplayFramebufferScale = _scaleFactor;
io.DeltaTime = deltaSeconds; // DeltaTime is in seconds.
ImGuiPlatformIOPtr platformIo = ImGui.GetPlatformIO();
platformIo.MainViewport.Pos = new Vector2(_window.X, _window.Y);
platformIo.MainViewport.Size = new Vector2(_window.Width, _window.Height);
}
/// <summary>
/// Renders the ImGui draw list data.
/// This method requires a <see cref="GraphicsDevice"/> because it may create new DeviceBuffers if the size of vertex
/// or index data has increased beyond the capacity of the existing buffers.
/// A <see cref="CommandList"/> is needed to submit drawing and resource update commands.
/// </summary>
public void Render(GraphicsDevice gd, CommandList cl)
{
if (_frameBegun)
{
_frameBegun = false;
ImGui.Render();
RenderImDrawData(ImGui.GetDrawData(), gd, cl);
// Update and Render additional Platform Windows
if ((ImGui.GetIO().ConfigFlags & ImGuiConfigFlags.ViewportsEnable) != 0)
{
ImGui.UpdatePlatformWindows();
ImGuiPlatformIOPtr platformIO = ImGui.GetPlatformIO();
for (int i = 1; i < platformIO.Viewports.Size; i++)
{
ImGuiViewportPtr vp = platformIO.Viewports[i];
VeldridImGuiWindow window = (VeldridImGuiWindow)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
cl.SetFramebuffer(window.Swapchain.Framebuffer);
RenderImDrawData(vp.DrawData, gd, cl);
}
}
}
}
/// <summary>
/// Constructs a new ImGuiController.
/// </summary>
public ImGuiController(GraphicsDevice gd, Sdl2Window window, OutputDescription outputDescription, int width, int height)
{
_gd = gd;
_window = window;
_windowWidth = width;
_windowHeight = height;
IntPtr context = ImGui.CreateContext();
ImGui.SetCurrentContext(context);
ImGuiIOPtr io = ImGui.GetIO();
io.ConfigFlags |= ImGuiConfigFlags.DockingEnable;
io.ConfigFlags |= ImGuiConfigFlags.ViewportsEnable;
ImGuiPlatformIOPtr platformIO = ImGui.GetPlatformIO();
ImGuiViewportPtr mainViewport = platformIO.MainViewport;
_mainViewportWindow = new VeldridImGuiWindow(gd, mainViewport, _window);
mainViewport.PlatformHandle = window.Handle;
_createWindow = CreateWindow;
_destroyWindow = DestroyWindow;
_getWindowPos = GetWindowPos;
_showWindow = ShowWindow;
_setWindowPos = SetWindowPos;
_setWindowSize = SetWindowSize;
_getWindowSize = GetWindowSize;
_setWindowFocus = SetWindowFocus;
_getWindowFocus = GetWindowFocus;
_getWindowMinimized = GetWindowMinimized;
_setWindowTitle = SetWindowTitle;
platformIO.Platform_CreateWindow = Marshal.GetFunctionPointerForDelegate(_createWindow);
platformIO.Platform_DestroyWindow = Marshal.GetFunctionPointerForDelegate(_destroyWindow);
platformIO.Platform_ShowWindow = Marshal.GetFunctionPointerForDelegate(_showWindow);
platformIO.Platform_SetWindowPos = Marshal.GetFunctionPointerForDelegate(_setWindowPos);
platformIO.Platform_SetWindowSize = Marshal.GetFunctionPointerForDelegate(_setWindowSize);
platformIO.Platform_SetWindowFocus = Marshal.GetFunctionPointerForDelegate(_setWindowFocus);
platformIO.Platform_GetWindowFocus = Marshal.GetFunctionPointerForDelegate(_getWindowFocus);
platformIO.Platform_GetWindowMinimized = Marshal.GetFunctionPointerForDelegate(_getWindowMinimized);
platformIO.Platform_SetWindowTitle = Marshal.GetFunctionPointerForDelegate(_setWindowTitle);
platformIO.Platform_GetWindowPos = Marshal.GetFunctionPointerForDelegate(_getWindowPos);
platformIO.Platform_GetWindowSize = Marshal.GetFunctionPointerForDelegate(_getWindowSize);
unsafe
{
io.NativePtr->BackendPlatformName = (byte *)new FixedAsciiString("Veldrid.SDL2 Backend").DataPtr;
}
io.BackendFlags |= ImGuiBackendFlags.HasMouseCursors;
io.BackendFlags |= ImGuiBackendFlags.HasSetMousePos;
io.BackendFlags |= ImGuiBackendFlags.PlatformHasViewports;
io.BackendFlags |= ImGuiBackendFlags.RendererHasViewports;
io.Fonts.AddFontDefault();
CreateDeviceResources(gd, outputDescription);
SetKeyMappings();
SetPerFrameImGuiData(1f / 60f);
UpdateMonitors();
ImGui.NewFrame();
_frameBegun = true;
}
