Imgui linux: implemented x11 input

1 files changed, 192 insertions, 0 deletions

diff --git a/Imgui/src/ImGuiImplLinuxX11.cpp b/Imgui/src/ImGuiImplLinuxX11.cpp
new file mode 100644
index 0000000..2497978
--- /dev/null
+++ b/Imgui/src/ImGuiImplLinuxX11.cpp
@@ -0,0 +1,192 @@
+/*     Copyright 2019 Diligent Graphics LLC
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/Xutil.h>
+
+#ifdef Bool
+#   undef Bool
+#endif
+
+#ifdef True
+#   undef True
+#endif
+
+#ifdef False
+#   undef False
+#endif
+
+
+#include "imgui.h"
+
+#include "ImGuiImplLinuxX11.h"
+
+namespace Diligent
+{
+
+ImGuiImplLinuxX11::ImGuiImplLinuxX11(IRenderDevice*    pDevice,
+                                     TEXTURE_FORMAT    BackBufferFmt,
+                                     TEXTURE_FORMAT    DepthBufferFmt,
+                                     Uint32            DisplayWidth,
+                                     Uint32            DisplayHeight,
+                                     Uint32            InitialVertexBufferSize,
+                                     Uint32            InitialIndexBufferSize) :
+     ImGuiImplDiligent(pDevice, BackBufferFmt, DepthBufferFmt, InitialVertexBufferSize, InitialIndexBufferSize)
+{
+
+    auto& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2(DisplayWidth, DisplayHeight);
+    
+    io.BackendPlatformName = "Diligent-ImGuiImplLinuxX11";
+    
+    // Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array that we will update during the application lifetime.
+    io.KeyMap[ImGuiKey_Tab]         = 256;
+    io.KeyMap[ImGuiKey_LeftArrow]   = 257;
+    io.KeyMap[ImGuiKey_RightArrow]  = 258;
+    io.KeyMap[ImGuiKey_UpArrow]     = 259;
+    io.KeyMap[ImGuiKey_DownArrow]   = 260;
+    io.KeyMap[ImGuiKey_PageUp]      = 261;
+    io.KeyMap[ImGuiKey_PageDown]    = 262;
+    io.KeyMap[ImGuiKey_Home]        = 263;
+    io.KeyMap[ImGuiKey_End]         = 264;
+    io.KeyMap[ImGuiKey_Insert]      = 265;
+    io.KeyMap[ImGuiKey_Delete]      = 266;
+    io.KeyMap[ImGuiKey_Backspace]   = 267;
+    io.KeyMap[ImGuiKey_Space]       = 268;
+    io.KeyMap[ImGuiKey_Enter]       = 269;
+    //io.KeyMap[ImGuiKey_Escape]      = 270;
+    io.KeyMap[ImGuiKey_KeyPadEnter] = 271;
+    io.KeyMap[ImGuiKey_A] = 'A';
+    io.KeyMap[ImGuiKey_C] = 'C';
+    io.KeyMap[ImGuiKey_V] = 'V';
+    io.KeyMap[ImGuiKey_X] = 'X';
+    io.KeyMap[ImGuiKey_Y] = 'Y';
+    io.KeyMap[ImGuiKey_Z] = 'Z';
+
+    m_LastTimestamp = std::chrono::high_resolution_clock::now();
+}
+
+ImGuiImplLinuxX11::~ImGuiImplLinuxX11()
+{
+}
+
+void ImGuiImplLinuxX11::NewFrame()
+{
+    auto now = std::chrono::high_resolution_clock::now();
+    auto elapsed_ns =  now - m_LastTimestamp;
+    m_LastTimestamp = now;
+    auto& io = ImGui::GetIO();
+    io.DeltaTime = static_cast<float>(elapsed_ns.count() / 1e+9);
+
+    ImGuiImplDiligent::NewFrame();
+}
+
+
+bool ImGuiImplLinuxX11::HandleXEvent(XEvent* event)
+{
+    auto& io = ImGui::GetIO();
+    switch (event->type)
+    {
+        case ButtonPress:
+        case ButtonRelease:
+        {
+            bool IsPressed = event->type == ButtonPress;
+            auto* xbe = reinterpret_cast<XButtonEvent *>(event);
+            switch(xbe->button)
+            {
+                case Button1: io.MouseDown[0] = IsPressed; break; // Left
+                case Button2: io.MouseDown[2] = IsPressed; break; // Middle
+                case Button3: io.MouseDown[1] = IsPressed; break; // Right
+                case Button4: io.MouseWheel += 1; break;
+                case Button5: io.MouseWheel -= 1; break;
+            }
+            return io.WantCaptureMouse;
+        }
+
+        case MotionNotify:
+        {
+            XMotionEvent* xme = (XMotionEvent *)event;
+            io.MousePos = ImVec2(xme->x, xme->y);
+            return io.WantCaptureMouse;
+        }
+
+        case ConfigureNotify:
+        {
+            XConfigureEvent *xce = (XConfigureEvent *)event;
+            io.DisplaySize = ImVec2(xce->width, xce->height);
+            return false;
+        }
+
+        case KeyPress:
+        case KeyRelease:  
+        {
+            bool IsPressed = event->type == KeyPress;
+            io.KeyCtrl  = (event->xkey.state & ControlMask) != 0;
+            io.KeyShift = (event->xkey.state & ShiftMask)   != 0;
+            io.KeyAlt   = (event->xkey.state & Mod1Mask)    != 0;
+
+            KeySym keysym = 0;
+            constexpr int buff_sz = 80;
+            char buffer[buff_sz];
+            int num_char = XLookupString((XKeyEvent *)event, buffer, buff_sz, &keysym, 0);
+            int k = 0;
+            switch(keysym)
+            {
+                case XK_Tab:       k = io.KeyMap[ImGuiKey_Tab];        break;
+                case XK_Left:      k = io.KeyMap[ImGuiKey_LeftArrow];  break;
+                case XK_Right:     k = io.KeyMap[ImGuiKey_RightArrow]; break;
+                case XK_Up:        k = io.KeyMap[ImGuiKey_UpArrow];    break;
+                case XK_Down:      k = io.KeyMap[ImGuiKey_DownArrow];  break;
+                case XK_Page_Up:   k = io.KeyMap[ImGuiKey_PageUp];     break;
+                case XK_Page_Down: k = io.KeyMap[ImGuiKey_PageDown];   break;
+                case XK_Home:      k = io.KeyMap[ImGuiKey_Home];       break;
+                case XK_End:       k = io.KeyMap[ImGuiKey_End];        break;
+                case XK_Insert:    k = io.KeyMap[ImGuiKey_Insert];     break;
+                case XK_Delete:    k = io.KeyMap[ImGuiKey_Delete];     break;
+                case XK_BackSpace: k = io.KeyMap[ImGuiKey_Backspace];  break;
+                //case XK_space:     k = io.KeyMap[ImGuiKey_Space];      break;
+                case XK_Return:    k = io.KeyMap[ImGuiKey_Enter];      break;
+                case XK_Escape:    k = io.KeyMap[ImGuiKey_Escape];     break;
+                case XK_KP_Enter:  k = io.KeyMap[ImGuiKey_KeyPadEnter];break;
+            }
+
+            if (k!=0)
+                io.KeysDown[k] = IsPressed;
+
+            if (k == 0 && IsPressed)
+            {
+                for (int i=0; i < num_char; ++i)
+                    io.AddInputCharacter(buffer[i]);
+            }
+
+            return io.WantCaptureKeyboard;
+        }
+
+        default:  
+            break;
+    }
+    return false;    
+}
+
+}