ImGuiController with viewports

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max 2024-06-21 23:17:44 +02:00
parent 9d8f4f6089
commit 604371b982
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# MoonWorksDearImGuiScaffold
A starter project that you can use to get a MoonWorks + Dear ImGui application up and running.
A starter project that you can use to get a MoonWorks + Dear ImGui application up and running. With docking and viewport support.
> NOTE: The `ImGuiController` relies on `Window.Handle` by default this is an internal getter, make it public for this to run/compile.
## Usage
@ -11,3 +13,5 @@ Add your ImGui commands to the `ImGuiCommands` method.
In VSCode, press Ctrl-Shift-B to bring up the build menu.
You can also use the `dotnet` CLI interface to build or publish.
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// ImGuiController with docking and viewport support for MoonWorks/Refresh.
// Based on the example im ImGui.NET and MoonWorksDearImGuiScaffold.
// One change is needed in MoonWorks, and that is to make Window.Handle a public getter.
using ImGuiNET;
using MoonWorks;
using MoonWorks.Graphics;
using MoonWorks.Input;
using System;
using System.Collections.Generic;
using System.IO;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace MoonWorksDearImGuiScaffold;
internal class ImGuiController : IDisposable
{
public event Action OnGui;
private readonly string shaderContentPath = Path.Combine(System.AppContext.BaseDirectory, "Content", "Shaders");
private readonly GraphicsDevice graphicsDevice;
private readonly Window mainWindow;
private readonly Inputs inputs;
private readonly Color clearColor;
private readonly Platform_CreateWindow createWindow;
private readonly Platform_DestroyWindow destroyWindow;
private readonly Platform_GetWindowPos getWindowPos;
private readonly Platform_ShowWindow showWindow;
private readonly Platform_SetWindowPos setWindowPos;
private readonly Platform_SetWindowSize setWindowSize;
private readonly Platform_GetWindowSize getWindowSize;
private readonly Platform_SetWindowFocus setWindowFocus;
private readonly Platform_GetWindowFocus getWindowFocus;
private readonly Platform_GetWindowMinimized getWindowMinimized;
private readonly Platform_SetWindowTitle setWindowTitle;
private readonly GraphicsPipeline imGuiPipeline;
private readonly ShaderModule imGuiVertexShader;
private readonly ShaderModule imGuiFragmentShader;
private readonly Sampler imGuiSampler;
private readonly TextureStorage textureStorage = new TextureStorage();
private readonly Dictionary<Window, GCHandle> windows = new Dictionary<Window, GCHandle>(16);
private Texture fontTexture = null;
private uint vertexCount = 0;
private uint indexCount = 0;
private MoonWorks.Graphics.Buffer imGuiVertexBuffer = null;
private MoonWorks.Graphics.Buffer imGuiIndexBuffer = null;
private bool frameBegun = false;
public ImGuiController(GraphicsDevice graphicsDevice, Window mainWindow, Inputs inputs, Color clearColor, ImGuiConfigFlags configFlags = ImGuiConfigFlags.NavEnableKeyboard | ImGuiConfigFlags.DockingEnable | ImGuiConfigFlags.ViewportsEnable)
{
this.mainWindow = mainWindow;
this.graphicsDevice = graphicsDevice;
this.inputs = inputs;
this.clearColor = clearColor;
ImGui.CreateContext();
ImGuiIOPtr io = ImGui.GetIO();
io.DisplaySize = new Vector2(mainWindow.Width, mainWindow.Height);
io.DisplayFramebufferScale = Vector2.One;
imGuiVertexShader = new ShaderModule(graphicsDevice, Path.Combine(shaderContentPath, "ImGui.vert.refresh"));
imGuiFragmentShader = new ShaderModule(graphicsDevice, Path.Combine(shaderContentPath, "ImGui.frag.refresh"));
imGuiSampler = new Sampler(graphicsDevice, SamplerCreateInfo.LinearClamp);
imGuiPipeline = new GraphicsPipeline(
graphicsDevice,
new GraphicsPipelineCreateInfo
{
AttachmentInfo = new GraphicsPipelineAttachmentInfo(
new ColorAttachmentDescription(
mainWindow.SwapchainFormat,
ColorAttachmentBlendState.NonPremultiplied
)
),
DepthStencilState = DepthStencilState.Disable,
VertexShaderInfo = GraphicsShaderInfo.Create<Matrix4x4>(imGuiVertexShader, "main", 0),
FragmentShaderInfo = GraphicsShaderInfo.Create(imGuiFragmentShader, "main", 1),
VertexInputState = VertexInputState.CreateSingleBinding<Position2DTextureColorVertex>(),
PrimitiveType = PrimitiveType.TriangleList,
RasterizerState = RasterizerState.CW_CullNone,
MultisampleState = MultisampleState.None
}
);
BuildFontAtlas();
Inputs.TextInput += c =>
{
if (c == '\t') { return; }
io.AddInputCharacter(c);
};
io.ConfigFlags = configFlags;
io.MouseDrawCursor = true;
if (!OperatingSystem.IsWindows())
{
io.SetClipboardTextFn = Clipboard.SetFnPtr;
io.GetClipboardTextFn = Clipboard.GetFnPtr;
}
ImGuiPlatformIOPtr platformIO = ImGui.GetPlatformIO();
ImGuiViewportPtr mainViewport = platformIO.Viewports[0];
mainViewport.PlatformHandle = mainWindow.Handle;
GCHandle handle = GCHandle.Alloc(mainWindow);
mainViewport.PlatformUserData = (IntPtr)handle;
windows.Add(mainWindow, handle);
unsafe
{
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);
ImGuiNative.ImGuiPlatformIO_Set_Platform_GetWindowPos(platformIO.NativePtr, Marshal.GetFunctionPointerForDelegate(getWindowPos));
ImGuiNative.ImGuiPlatformIO_Set_Platform_GetWindowSize(platformIO.NativePtr, Marshal.GetFunctionPointerForDelegate(getWindowSize));
}
io.BackendFlags |= ImGuiBackendFlags.HasMouseCursors;
io.BackendFlags |= ImGuiBackendFlags.HasSetMousePos;
io.BackendFlags |= ImGuiBackendFlags.PlatformHasViewports;
io.BackendFlags |= ImGuiBackendFlags.RendererHasViewports;
}
public void Update(float deltaTime)
{
if (frameBegun)
{
ImGui.Render();
ImGui.UpdatePlatformWindows();
}
UpdatePerFrameImGuiData(deltaTime);
UpdateInput();
UpdateMonitors();
frameBegun = true;
ImGui.NewFrame();
OnGui?.Invoke();
ImGui.EndFrame();
}
private void UpdatePerFrameImGuiData(float deltaSeconds)
{
ImGuiIOPtr io = ImGui.GetIO();
io.DisplaySize = new Vector2(mainWindow.Width, mainWindow.Height);
io.DisplayFramebufferScale = new Vector2(1, 1);
io.DeltaTime = deltaSeconds; // DeltaTime is in seconds.
}
private void UpdateInput()
{
ImGuiIOPtr io = ImGui.GetIO();
if ((ImGui.GetIO().ConfigFlags & ImGuiConfigFlags.ViewportsEnable) != 0)
{
// For viewports we use the global mouse position.
_ = SDL2.SDL.SDL_GetGlobalMouseState(out int x, out int y);
io.MousePos = new Vector2(x, y);
}
else
{
// Without viewports we need to use the relative position.
//_ = SDL2.SDL.SDL_GetMouseState(out int x, out int y);
io.MousePos = new Vector2(inputs.Mouse.X, inputs.Mouse.Y);
}
io.MouseDown[0] = inputs.Mouse.LeftButton.IsDown;
io.MouseDown[1] = inputs.Mouse.RightButton.IsDown;
io.MouseDown[2] = inputs.Mouse.MiddleButton.IsDown;
io.MouseWheel = inputs.Mouse.Wheel;
io.AddKeyEvent(ImGuiKey.A, inputs.Keyboard.IsDown(KeyCode.A));
io.AddKeyEvent(ImGuiKey.Z, inputs.Keyboard.IsDown(KeyCode.Z));
io.AddKeyEvent(ImGuiKey.Y, inputs.Keyboard.IsDown(KeyCode.Y));
io.AddKeyEvent(ImGuiKey.X, inputs.Keyboard.IsDown(KeyCode.X));
io.AddKeyEvent(ImGuiKey.C, inputs.Keyboard.IsDown(KeyCode.C));
io.AddKeyEvent(ImGuiKey.V, inputs.Keyboard.IsDown(KeyCode.V));
io.AddKeyEvent(ImGuiKey.Tab, inputs.Keyboard.IsDown(KeyCode.Tab));
io.AddKeyEvent(ImGuiKey.LeftArrow, inputs.Keyboard.IsDown(KeyCode.Left));
io.AddKeyEvent(ImGuiKey.RightArrow, inputs.Keyboard.IsDown(KeyCode.Right));
io.AddKeyEvent(ImGuiKey.UpArrow, inputs.Keyboard.IsDown(KeyCode.Up));
io.AddKeyEvent(ImGuiKey.DownArrow, inputs.Keyboard.IsDown(KeyCode.Down));
io.AddKeyEvent(ImGuiKey.Enter, inputs.Keyboard.IsDown(KeyCode.Return));
io.AddKeyEvent(ImGuiKey.Escape, inputs.Keyboard.IsDown(KeyCode.Escape));
io.AddKeyEvent(ImGuiKey.Delete, inputs.Keyboard.IsDown(KeyCode.Delete));
io.AddKeyEvent(ImGuiKey.Backspace, inputs.Keyboard.IsDown(KeyCode.Backspace));
io.AddKeyEvent(ImGuiKey.Home, inputs.Keyboard.IsDown(KeyCode.Home));
io.AddKeyEvent(ImGuiKey.End, inputs.Keyboard.IsDown(KeyCode.End));
io.AddKeyEvent(ImGuiKey.PageDown, inputs.Keyboard.IsDown(KeyCode.PageDown));
io.AddKeyEvent(ImGuiKey.PageUp, inputs.Keyboard.IsDown(KeyCode.PageUp));
io.AddKeyEvent(ImGuiKey.Insert, inputs.Keyboard.IsDown(KeyCode.Insert));
io.AddKeyEvent(ImGuiKey.ModCtrl, inputs.Keyboard.IsDown(KeyCode.LeftControl) || inputs.Keyboard.IsDown(KeyCode.RightControl));
io.AddKeyEvent(ImGuiKey.ModShift, inputs.Keyboard.IsDown(KeyCode.LeftShift) || inputs.Keyboard.IsDown(KeyCode.RightShift));
io.AddKeyEvent(ImGuiKey.ModAlt, inputs.Keyboard.IsDown(KeyCode.LeftAlt) || inputs.Keyboard.IsDown(KeyCode.RightAlt));
io.AddKeyEvent(ImGuiKey.ModSuper, inputs.Keyboard.IsDown(KeyCode.LeftMeta) || inputs.Keyboard.IsDown(KeyCode.RightMeta));
}
private unsafe void UpdateMonitors()
{
ImGuiPlatformIOPtr platformIO = ImGui.GetPlatformIO();
Marshal.FreeHGlobal(platformIO.NativePtr->Monitors.Data);
int videoDisplayCount = SDL2.SDL.SDL_GetNumVideoDisplays();
IntPtr data = Marshal.AllocHGlobal(Unsafe.SizeOf<ImGuiPlatformMonitor>() * videoDisplayCount);
platformIO.NativePtr->Monitors = new ImVector(videoDisplayCount, videoDisplayCount, data);
for (int i = 0; i < videoDisplayCount; i++)
{
_ = SDL2.SDL.SDL_GetDisplayUsableBounds(i, out SDL2.SDL.SDL_Rect usableBounds);
_ = SDL2.SDL.SDL_GetDisplayBounds(i, out SDL2.SDL.SDL_Rect bounds);
_ = SDL2.SDL.SDL_GetDisplayDPI(i, out float ddpi, out float hdpi, out float vdpi);
ImGuiPlatformMonitorPtr monitor = platformIO.Monitors[i];
float standardDpi = 96f; // Standard DPI typically used
monitor.DpiScale = hdpi / standardDpi;
monitor.MainPos = new Vector2(bounds.x, bounds.y);
monitor.MainSize = new Vector2(bounds.w, bounds.h);
monitor.WorkPos = new Vector2(usableBounds.x, usableBounds.y);
monitor.WorkSize = new Vector2(usableBounds.w, usableBounds.h);
}
}
public void Render()
{
if (!frameBegun)
{
return;
}
frameBegun = false;
if ((ImGui.GetIO().ConfigFlags & ImGuiConfigFlags.ViewportsEnable) != 0)
{
ImGui.Render();
ImGui.UpdatePlatformWindows();
ImGuiPlatformIOPtr platformIO = ImGui.GetPlatformIO();
for (int i = 0; i < platformIO.Viewports.Size; i++)
{
ImGuiViewportPtr vp = platformIO.Viewports[i];
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
if (!window.Claimed)
{
continue;
}
UpdateImGuiBuffers(vp.DrawData);
CommandBuffer commandBuffer = graphicsDevice.AcquireCommandBuffer();
Texture swapchainTexture = commandBuffer.AcquireSwapchainTexture(window);
if (swapchainTexture != null)
{
RenderCommandLists(commandBuffer, swapchainTexture, vp.DrawData);
graphicsDevice.Submit(commandBuffer);
graphicsDevice.Wait();
}
}
}
else
{
ImGui.Render();
if (!mainWindow.Claimed)
{
return;
}
ImDrawDataPtr drawDataPtr = ImGui.GetDrawData();
UpdateImGuiBuffers(drawDataPtr);
CommandBuffer commandBuffer = graphicsDevice.AcquireCommandBuffer();
Texture swapchainTexture = commandBuffer.AcquireSwapchainTexture(mainWindow);
if (swapchainTexture != null)
{
RenderCommandLists(commandBuffer, swapchainTexture, drawDataPtr);
graphicsDevice.Submit(commandBuffer);
graphicsDevice.Wait();
}
}
}
private unsafe void UpdateImGuiBuffers(ImDrawDataPtr drawDataPtr)
{
if (drawDataPtr.TotalVtxCount == 0 || drawDataPtr.CmdListsCount == 0)
{
return;
}
CommandBuffer commandBuffer = graphicsDevice.AcquireCommandBuffer();
if (drawDataPtr.TotalVtxCount > vertexCount)
{
imGuiVertexBuffer?.Dispose();
vertexCount = (uint)(drawDataPtr.TotalVtxCount * 1.5f);
imGuiVertexBuffer = MoonWorks.Graphics.Buffer.Create<Position2DTextureColorVertex>(
graphicsDevice,
BufferUsageFlags.Vertex,
vertexCount
);
}
if (drawDataPtr.TotalIdxCount > indexCount)
{
imGuiIndexBuffer?.Dispose();
indexCount = (uint)(drawDataPtr.TotalIdxCount * 1.5f);
imGuiIndexBuffer = MoonWorks.Graphics.Buffer.Create<ushort>(
graphicsDevice,
BufferUsageFlags.Index,
indexCount
);
}
uint vertexOffset = 0;
uint indexOffset = 0;
for (int n = 0; n < drawDataPtr.CmdListsCount; n++)
{
ImDrawListPtr cmdList = drawDataPtr.CmdLists[n];
commandBuffer.SetBufferData<Position2DTextureColorVertex>(
imGuiVertexBuffer,
cmdList.VtxBuffer.Data,
vertexOffset,
(uint)cmdList.VtxBuffer.Size
);
commandBuffer.SetBufferData<ushort>(
imGuiIndexBuffer,
cmdList.IdxBuffer.Data,
indexOffset,
(uint)cmdList.IdxBuffer.Size
);
vertexOffset += (uint)cmdList.VtxBuffer.Size;
indexOffset += (uint)cmdList.IdxBuffer.Size;
}
graphicsDevice.Submit(commandBuffer);
}
private void RenderCommandLists(CommandBuffer commandBuffer, Texture renderTexture, ImDrawDataPtr drawDataPtr)
{
Vector2 pos = drawDataPtr.DisplayPos;
commandBuffer.BeginRenderPass(
new ColorAttachmentInfo(renderTexture, clearColor)
);
commandBuffer.BindGraphicsPipeline(imGuiPipeline);
// It is possible that the buffers are null (for example nothing is in our main windows viewport, then we exixt early but still clear it).
if (imGuiVertexBuffer == null || imGuiIndexBuffer == null)
{
commandBuffer.EndRenderPass();
return;
}
Matrix4x4 projectionMatrix = Matrix4x4.CreateOrthographicOffCenter(
pos.X,
pos.X + drawDataPtr.DisplaySize.X,
pos.Y,
pos.Y + drawDataPtr.DisplaySize.Y,
-1.0f,
1.0f
);
uint vertexUniformOffset = commandBuffer.PushVertexShaderUniforms(projectionMatrix);
commandBuffer.BindVertexBuffers(imGuiVertexBuffer);
commandBuffer.BindIndexBuffer(imGuiIndexBuffer, IndexElementSize.Sixteen);
uint vertexOffset = 0;
uint indexOffset = 0;
for (int n = 0; n < drawDataPtr.CmdListsCount; n++)
{
ImDrawListPtr cmdList = drawDataPtr.CmdLists[n];
for (int cmdIndex = 0; cmdIndex < cmdList.CmdBuffer.Size; cmdIndex++)
{
ImDrawCmdPtr drawCmd = cmdList.CmdBuffer[cmdIndex];
Texture texture = textureStorage.GetTexture(drawCmd.TextureId);
if (texture == null)
{
Logger.LogError("Texture or drawCmd.TextureId became null. Fit it!");
continue;
}
TextureSamplerBinding binding = new TextureSamplerBinding(texture, imGuiSampler);
commandBuffer.BindFragmentSamplers(binding);
float width = drawCmd.ClipRect.Z - (int)drawCmd.ClipRect.X;
float height = drawCmd.ClipRect.W - (int)drawCmd.ClipRect.Y;
if (width <= 0 || height <= 0)
{
continue;
}
commandBuffer.SetScissor(
new Rect(
(int)drawCmd.ClipRect.X - (int)pos.X,
(int)drawCmd.ClipRect.Y - (int)pos.Y,
(int)drawCmd.ClipRect.Z - (int)drawCmd.ClipRect.X,
(int)drawCmd.ClipRect.W - (int)drawCmd.ClipRect.Y
)
);
commandBuffer.DrawIndexedPrimitives(
vertexOffset,
indexOffset,
drawCmd.ElemCount / 3,
vertexUniformOffset,
0
);
indexOffset += drawCmd.ElemCount;
}
vertexOffset += (uint)cmdList.VtxBuffer.Size;
}
commandBuffer.EndRenderPass();
}
private void BuildFontAtlas()
{
CommandBuffer commandBuffer = graphicsDevice.AcquireCommandBuffer();
ImGuiIOPtr io = ImGui.GetIO();
io.Fonts.GetTexDataAsRGBA32(
out nint pixelData,
out int width,
out int height,
out int bytesPerPixel
);
Texture fontTexture = Texture.CreateTexture2D(
graphicsDevice,
(uint)width,
(uint)height,
TextureFormat.R8G8B8A8,
TextureUsageFlags.Sampler
);
commandBuffer.SetTextureData(fontTexture, pixelData, (uint)(width * height * bytesPerPixel));
graphicsDevice.Submit(commandBuffer);
io.Fonts.SetTexID(fontTexture.Handle);
io.Fonts.ClearTexData();
textureStorage.Add(fontTexture); // <-- The fontTexture seems to get lost after some time (CG?).
this.fontTexture = fontTexture; // <-- So we also keep a reference to make sure it doesn't happen.
}
#region Window
private void CreateWindow(ImGuiViewportPtr vp)
{
WindowCreateInfo info = new WindowCreateInfo("Window Title", (uint)vp.Pos.X, (uint)vp.Pos.Y, ScreenMode.Windowed, PresentMode.FIFO);
SDL2.SDL.SDL_WindowFlags flags = graphicsDevice.WindowFlags;
flags |= SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_HIDDEN;
if ((vp.Flags & ImGuiViewportFlags.NoTaskBarIcon) != 0)
{
flags |= SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_SKIP_TASKBAR;
}
if ((vp.Flags & ImGuiViewportFlags.NoDecoration) != 0)
{
flags |= SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_BORDERLESS;
}
else
{
flags |= SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_RESIZABLE;
}
if ((vp.Flags & ImGuiViewportFlags.TopMost) != 0)
{
flags |= SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_ALWAYS_ON_TOP;
}
Window window = new Window(info, flags);
graphicsDevice.ClaimWindow(window, PresentMode.FIFO);
GCHandle handle = GCHandle.Alloc(window);
vp.PlatformUserData = (IntPtr)handle;
windows.Add(window, handle);
}
private void DestroyWindow(ImGuiViewportPtr vp)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
graphicsDevice.UnclaimWindow(window);
if (windows.TryGetValue(window, out GCHandle handle))
{
handle.Free();
windows.Remove(window);
}
graphicsDevice.Wait();
window.Dispose();
}
private void ShowWindow(ImGuiViewportPtr vp)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_ShowWindow(window.Handle);
}
private unsafe void GetWindowPos(ImGuiViewportPtr vp, Vector2* outPos)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_GetWindowPosition(window.Handle, out int x, out int y);
*outPos = new Vector2(x, y);
}
private void SetWindowPos(ImGuiViewportPtr vp, Vector2 pos)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_SetWindowPosition(window.Handle, (int)pos.X, (int)pos.Y);
}
private void SetWindowSize(ImGuiViewportPtr vp, Vector2 size)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_SetWindowSize(window.Handle, (int)size.X, (int)size.Y);
}
private unsafe void GetWindowSize(ImGuiViewportPtr vp, Vector2* outSize)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_GetWindowSize(window.Handle, out int w, out int h);
*outSize = new Vector2(w, h);
}
private void SetWindowFocus(ImGuiViewportPtr vp)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
//SDL2.SDL.SDL_SetWindowInputFocus(window.Handle);
SDL2.SDL.SDL_RaiseWindow(window.Handle);
}
private byte GetWindowFocus(ImGuiViewportPtr vp)
{
if (vp.PlatformUserData == IntPtr.Zero) return (byte)0;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_WindowFlags flags = (SDL2.SDL.SDL_WindowFlags)SDL2.SDL.SDL_GetWindowFlags(window.Handle);
return (flags & SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_INPUT_FOCUS) != 0 ? (byte)1 : (byte)0;
}
private byte GetWindowMinimized(ImGuiViewportPtr vp)
{
if (vp.PlatformUserData == IntPtr.Zero) return (byte)0;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
SDL2.SDL.SDL_WindowFlags flags = (SDL2.SDL.SDL_WindowFlags)SDL2.SDL.SDL_GetWindowFlags(window.Handle);
return (flags & SDL2.SDL.SDL_WindowFlags.SDL_WINDOW_MINIMIZED) != 0 ? (byte)1 : (byte)0;
}
private unsafe void SetWindowTitle(ImGuiViewportPtr vp, IntPtr title)
{
if (vp.PlatformUserData == IntPtr.Zero) return;
Window window = (Window)GCHandle.FromIntPtr(vp.PlatformUserData).Target;
byte* titlePtr = (byte*)title;
int count = 0;
while (titlePtr[count] != 0)
{
count += 1;
}
SDL2.SDL.SDL_SetWindowTitle(window.Handle, System.Text.Encoding.ASCII.GetString(titlePtr, count));
}
#endregion
public void Dispose()
{
fontTexture.Dispose();
imGuiVertexBuffer.Dispose();
imGuiIndexBuffer.Dispose();
imGuiFragmentShader.Dispose();
imGuiVertexShader.Dispose();
imGuiPipeline.Dispose();
imGuiSampler.Dispose();
foreach (KeyValuePair<Window, GCHandle> window in windows)
{
graphicsDevice.UnclaimWindow(window.Key);
window.Key.Dispose();
window.Value.Free();
}
windows.Clear();
}
}

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using MoonWorks.Graphics;
using MoonWorks.Input;
using MoonWorks;
using ImGuiNET;
using System.IO;
using MoonWorks.Math.Float;
using System;
using MoonWorks;
using MoonWorks.Graphics;
namespace MoonWorksDearImGuiScaffold;
class MoonWorksDearImGuiScaffoldGame : Game
{
private string ShaderContentPath = Path.Combine(System.AppContext.BaseDirectory, "Content", "Shaders");
private GraphicsPipeline ImGuiPipeline;
private ShaderModule ImGuiVertexShader;
private ShaderModule ImGuiFragmentShader;
private Sampler ImGuiSampler;
private uint VertexCount = 0;
private uint IndexCount = 0;
private MoonWorks.Graphics.Buffer ImGuiVertexBuffer = null;
private MoonWorks.Graphics.Buffer ImGuiIndexBuffer = null;
private TextureStorage TextureStorage;
public MoonWorksDearImGuiScaffoldGame(
WindowCreateInfo windowCreateInfo,
FrameLimiterSettings frameLimiterSettings,
bool debugMode
) : base(windowCreateInfo, frameLimiterSettings, 60, debugMode)
{
TextureStorage = new TextureStorage();
ImGui.CreateContext();
var io = ImGui.GetIO();
io.DisplaySize = new System.Numerics.Vector2(MainWindow.Width, MainWindow.Height);
io.DisplayFramebufferScale = System.Numerics.Vector2.One;
ImGuiVertexShader =
new ShaderModule(GraphicsDevice, Path.Combine(ShaderContentPath, "ImGui.vert.refresh"));
ImGuiFragmentShader =
new ShaderModule(GraphicsDevice, Path.Combine(ShaderContentPath, "ImGui.frag.refresh"));
ImGuiSampler = new Sampler(GraphicsDevice, SamplerCreateInfo.LinearClamp);
ImGuiPipeline = new GraphicsPipeline(
GraphicsDevice,
new GraphicsPipelineCreateInfo
{
AttachmentInfo = new GraphicsPipelineAttachmentInfo(
new ColorAttachmentDescription(
MainWindow.SwapchainFormat,
ColorAttachmentBlendState.NonPremultiplied
)
),
DepthStencilState = DepthStencilState.Disable,
VertexShaderInfo = GraphicsShaderInfo.Create<Matrix4x4>(ImGuiVertexShader, "main", 0),
FragmentShaderInfo = GraphicsShaderInfo.Create(ImGuiFragmentShader, "main", 1),
VertexInputState = VertexInputState.CreateSingleBinding<Position2DTextureColorVertex>(),
PrimitiveType = PrimitiveType.TriangleList,
RasterizerState = RasterizerState.CW_CullNone,
MultisampleState = MultisampleState.None
}
);
BuildFontAtlas();
MainWindow.RegisterSizeChangeCallback(HandleSizeChange);
Inputs.TextInput += c =>
{
if (c == '\t') { return; }
io.AddInputCharacter(c);
};
io.ConfigFlags |= ImGuiConfigFlags.NavEnableKeyboard;
if (!OperatingSystem.IsWindows())
{
io.SetClipboardTextFn = Clipboard.SetFnPtr;
io.GetClipboardTextFn = Clipboard.GetFnPtr;
}
}
protected void HandleSizeChange(uint width, uint height)
{
var io = ImGui.GetIO();
io.DisplaySize = new System.Numerics.Vector2(width, height);
}
protected override void Update(System.TimeSpan dt)
{
var io = ImGui.GetIO();
io.MousePos = new System.Numerics.Vector2(Inputs.Mouse.X, Inputs.Mouse.Y);
io.MouseDown[0] = Inputs.Mouse.LeftButton.IsDown;
io.MouseDown[1] = Inputs.Mouse.RightButton.IsDown;
io.MouseDown[2] = Inputs.Mouse.MiddleButton.IsDown;
io.MouseWheel = Inputs.Mouse.Wheel;
io.AddKeyEvent(ImGuiKey.A, Inputs.Keyboard.IsDown(KeyCode.A));
io.AddKeyEvent(ImGuiKey.Z, Inputs.Keyboard.IsDown(KeyCode.Z));
io.AddKeyEvent(ImGuiKey.Y, Inputs.Keyboard.IsDown(KeyCode.Y));
io.AddKeyEvent(ImGuiKey.X, Inputs.Keyboard.IsDown(KeyCode.X));
io.AddKeyEvent(ImGuiKey.C, Inputs.Keyboard.IsDown(KeyCode.C));
io.AddKeyEvent(ImGuiKey.V, Inputs.Keyboard.IsDown(KeyCode.V));
io.AddKeyEvent(ImGuiKey.Tab, Inputs.Keyboard.IsDown(KeyCode.Tab));
io.AddKeyEvent(ImGuiKey.LeftArrow, Inputs.Keyboard.IsDown(KeyCode.Left));
io.AddKeyEvent(ImGuiKey.RightArrow, Inputs.Keyboard.IsDown(KeyCode.Right));
io.AddKeyEvent(ImGuiKey.UpArrow, Inputs.Keyboard.IsDown(KeyCode.Up));
io.AddKeyEvent(ImGuiKey.DownArrow, Inputs.Keyboard.IsDown(KeyCode.Down));
io.AddKeyEvent(ImGuiKey.Enter, Inputs.Keyboard.IsDown(KeyCode.Return));
io.AddKeyEvent(ImGuiKey.Escape, Inputs.Keyboard.IsDown(KeyCode.Escape));
io.AddKeyEvent(ImGuiKey.Delete, Inputs.Keyboard.IsDown(KeyCode.Delete));
io.AddKeyEvent(ImGuiKey.Backspace, Inputs.Keyboard.IsDown(KeyCode.Backspace));
io.AddKeyEvent(ImGuiKey.Home, Inputs.Keyboard.IsDown(KeyCode.Home));
io.AddKeyEvent(ImGuiKey.End, Inputs.Keyboard.IsDown(KeyCode.End));
io.AddKeyEvent(ImGuiKey.PageDown, Inputs.Keyboard.IsDown(KeyCode.PageDown));
io.AddKeyEvent(ImGuiKey.PageUp, Inputs.Keyboard.IsDown(KeyCode.PageUp));
io.AddKeyEvent(ImGuiKey.Insert, Inputs.Keyboard.IsDown(KeyCode.Insert));
io.AddKeyEvent(ImGuiKey.ModCtrl, Inputs.Keyboard.IsDown(KeyCode.LeftControl) || Inputs.Keyboard.IsDown(KeyCode.RightControl));
io.AddKeyEvent(ImGuiKey.ModShift, Inputs.Keyboard.IsDown(KeyCode.LeftShift) || Inputs.Keyboard.IsDown(KeyCode.RightShift));
io.AddKeyEvent(ImGuiKey.ModAlt, Inputs.Keyboard.IsDown(KeyCode.LeftAlt) || Inputs.Keyboard.IsDown(KeyCode.RightAlt));
io.AddKeyEvent(ImGuiKey.ModSuper, Inputs.Keyboard.IsDown(KeyCode.LeftMeta) || Inputs.Keyboard.IsDown(KeyCode.RightMeta));
ImGui.NewFrame();
ImGuiCommands();
ImGui.EndFrame();
}
protected void ImGuiCommands()
{
// Do your ImGui commands here!
ImGui.ShowDemoWindow();
}
protected override void Draw(double alpha)
{
ImGui.Render();
var io = ImGui.GetIO();
var drawDataPtr = ImGui.GetDrawData();
UpdateImGuiBuffers(drawDataPtr);
var commandBuffer = GraphicsDevice.AcquireCommandBuffer();
var swapchainTexture = commandBuffer.AcquireSwapchainTexture(MainWindow);
if (swapchainTexture != null)
{
RenderCommandLists(commandBuffer, swapchainTexture, drawDataPtr, io);
}
GraphicsDevice.Submit(commandBuffer);
}
protected override void Destroy()
{
}
private unsafe void UpdateImGuiBuffers(ImDrawDataPtr drawDataPtr)
{
if (drawDataPtr.TotalVtxCount == 0) { return; }
var commandBuffer = GraphicsDevice.AcquireCommandBuffer();
if (drawDataPtr.TotalVtxCount > VertexCount)
{
ImGuiVertexBuffer?.Dispose();
VertexCount = (uint)(drawDataPtr.TotalVtxCount * 1.5f);
ImGuiVertexBuffer = MoonWorks.Graphics.Buffer.Create<Position2DTextureColorVertex>(
GraphicsDevice,
BufferUsageFlags.Vertex,
VertexCount
);
}
if (drawDataPtr.TotalIdxCount > IndexCount)
{
ImGuiIndexBuffer?.Dispose();
IndexCount = (uint)(drawDataPtr.TotalIdxCount * 1.5f);
ImGuiIndexBuffer = MoonWorks.Graphics.Buffer.Create<ushort>(
GraphicsDevice,
BufferUsageFlags.Index,
IndexCount
);
}
uint vertexOffset = 0;
uint indexOffset = 0;
for (var n = 0; n < drawDataPtr.CmdListsCount; n += 1)
{
var cmdList = drawDataPtr.CmdLists[n];
commandBuffer.SetBufferData<Position2DTextureColorVertex>(
ImGuiVertexBuffer,
cmdList.VtxBuffer.Data,
vertexOffset,
(uint)cmdList.VtxBuffer.Size
);
commandBuffer.SetBufferData<ushort>(
ImGuiIndexBuffer,
cmdList.IdxBuffer.Data,
indexOffset,
(uint)cmdList.IdxBuffer.Size
);
vertexOffset += (uint)cmdList.VtxBuffer.Size;
indexOffset += (uint)cmdList.IdxBuffer.Size;
}
GraphicsDevice.Submit(commandBuffer);
}
private void RenderCommandLists(CommandBuffer commandBuffer, Texture renderTexture, ImDrawDataPtr drawDataPtr, ImGuiIOPtr ioPtr)
{
var view = Matrix4x4.CreateLookAt(
new Vector3(0, 0, 1),
Vector3.Zero,
Vector3.Up
);
var projection = Matrix4x4.CreateOrthographicOffCenter(
0,
480,
270,
0,
0.01f,
4000f
);
var viewProjectionMatrix = view * projection;
commandBuffer.BeginRenderPass(
new ColorAttachmentInfo(renderTexture, MoonWorks.Graphics.Color.CornflowerBlue)
);
commandBuffer.BindGraphicsPipeline(ImGuiPipeline);
var vertexUniformOffset = commandBuffer.PushVertexShaderUniforms(
Matrix4x4.CreateOrthographicOffCenter(0, ioPtr.DisplaySize.X, ioPtr.DisplaySize.Y, 0, -1, 1)
);
commandBuffer.BindVertexBuffers(ImGuiVertexBuffer);
commandBuffer.BindIndexBuffer(ImGuiIndexBuffer, IndexElementSize.Sixteen);
uint vertexOffset = 0;
uint indexOffset = 0;
for (int n = 0; n < drawDataPtr.CmdListsCount; n += 1)
{
var cmdList = drawDataPtr.CmdLists[n];
for (int cmdIndex = 0; cmdIndex < cmdList.CmdBuffer.Size; cmdIndex += 1)
{
var drawCmd = cmdList.CmdBuffer[cmdIndex];
commandBuffer.BindFragmentSamplers(
new TextureSamplerBinding(TextureStorage.GetTexture(drawCmd.TextureId), ImGuiSampler)
);
var topLeft = Vector2.Transform(new Vector2(drawCmd.ClipRect.X, drawCmd.ClipRect.Y), viewProjectionMatrix);
var bottomRight = Vector2.Transform(new Vector2(drawCmd.ClipRect.Z, drawCmd.ClipRect.W), viewProjectionMatrix);
var width = drawCmd.ClipRect.Z - (int)drawCmd.ClipRect.X;
var height = drawCmd.ClipRect.W - (int)drawCmd.ClipRect.Y;
if (width <= 0 || height <= 0)
{
continue;
}
commandBuffer.SetScissor(
new Rect(
(int)drawCmd.ClipRect.X,
(int)drawCmd.ClipRect.Y,
(int)width,
(int)height
)
);
commandBuffer.DrawIndexedPrimitives(
vertexOffset,
indexOffset,
drawCmd.ElemCount / 3,
vertexUniformOffset,
0
);
indexOffset += drawCmd.ElemCount;
}
vertexOffset += (uint)cmdList.VtxBuffer.Size;
}
commandBuffer.EndRenderPass();
}
private void BuildFontAtlas()
{
var commandBuffer = GraphicsDevice.AcquireCommandBuffer();
var io = ImGui.GetIO();
io.Fonts.GetTexDataAsRGBA32(
out System.IntPtr pixelData,
out int width,
out int height,
out int bytesPerPixel
);
var fontTexture = Texture.CreateTexture2D(
GraphicsDevice,
(uint)width,
(uint)height,
TextureFormat.R8G8B8A8,
TextureUsageFlags.Sampler
);
commandBuffer.SetTextureData(fontTexture, pixelData, (uint)(width * height * bytesPerPixel));
GraphicsDevice.Submit(commandBuffer);
io.Fonts.SetTexID(fontTexture.Handle);
io.Fonts.ClearTexData();
TextureStorage.Add(fontTexture);
}
}
private readonly ImGuiController imGuiController;
public MoonWorksDearImGuiScaffoldGame(
WindowCreateInfo windowCreateInfo,
FrameLimiterSettings frameLimiterSettings,
bool debugMode
) : base(windowCreateInfo, frameLimiterSettings, 60, debugMode)
{
// Render the mouse in software with ImGui.
Inputs.Mouse.Hidden = true;
imGuiController = new ImGuiController(GraphicsDevice, MainWindow, Inputs, Color.CornflowerBlue);
imGuiController.OnGui += ImGui.ShowDemoWindow;
}
protected override void Update(System.TimeSpan dt)
{
imGuiController.Update((float)dt.TotalSeconds);
}
protected override void Draw(double alpha)
{
imGuiController.Render();
}
protected override void Destroy()
{
imGuiController?.Dispose();
}
}