0030429: Samples - add simple glfw 3D Viewer sample

Aspect_DisplayConnection now provides constructor wrapping existing X Display connection.

samples/glfw/GlfwOcctWindow.cpp

@@ -0,0 +1,161 @@
+// Copyright (c) 2019 OPEN CASCADE SAS
+//
+// This file is part of the examples of the Open CASCADE Technology software library.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// 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. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
+
+#include "GlfwOcctWindow.h"
+
+#if defined (__APPLE__)
+  #undef Handle // avoid name collisions in macOS headers
+  #define GLFW_EXPOSE_NATIVE_COCOA
+  #define GLFW_EXPOSE_NATIVE_NSGL
+#elif defined (_WIN32)
+  #define GLFW_EXPOSE_NATIVE_WIN32
+  #define GLFW_EXPOSE_NATIVE_WGL
+#else
+  #define GLFW_EXPOSE_NATIVE_X11
+  #define GLFW_EXPOSE_NATIVE_GLX
+#endif
+#include <GLFW/glfw3.h>
+#include <GLFW/glfw3native.h>
+
+// ================================================================
+// Function : GlfwOcctWindow
+// Purpose  :
+// ================================================================
+GlfwOcctWindow::GlfwOcctWindow (int theWidth, int theHeight, const TCollection_AsciiString& theTitle)
+: myGlfwWindow (glfwCreateWindow (theWidth, theHeight, theTitle.ToCString(), NULL, NULL)),
+  myXLeft  (0),
+  myYTop   (0),
+  myXRight (0),
+  myYBottom(0)
+{
+  if (myGlfwWindow != nullptr)
+  {
+    int aWidth = 0, aHeight = 0;
+    glfwGetWindowPos (myGlfwWindow, &myXLeft, &myYTop);
+    glfwGetWindowSize(myGlfwWindow, &aWidth, &aHeight);
+    myXRight  = myXLeft + aWidth;
+    myYBottom = myYTop + aHeight;
+
+  #if !defined(_WIN32) && !defined(__APPLE__)
+    myDisplay = new Aspect_DisplayConnection (glfwGetX11Display());
+  #endif
+  }
+}
+
+// ================================================================
+// Function : Close
+// Purpose  :
+// ================================================================
+void GlfwOcctWindow::Close()
+{
+  if (myGlfwWindow != nullptr)
+  {
+    glfwDestroyWindow (myGlfwWindow);
+    myGlfwWindow = nullptr;
+  }
+}
+
+// ================================================================
+// Function : NativeHandle
+// Purpose  :
+// ================================================================
+Aspect_Drawable GlfwOcctWindow::NativeHandle() const
+{
+#if defined (__APPLE__)
+  return (Aspect_Drawable)glfwGetCocoaWindow (myGlfwWindow);
+#elif defined (_WIN32)
+  return (Aspect_Drawable)glfwGetWin32Window (myGlfwWindow);
+#else
+  return (Aspect_Drawable)glfwGetX11Window (myGlfwWindow);
+#endif
+}
+
+// ================================================================
+// Function : NativeGlContext
+// Purpose  :
+// ================================================================
+Aspect_RenderingContext GlfwOcctWindow::NativeGlContext() const
+{
+#if defined (__APPLE__)
+  return (NSOpenGLContext*)glfwGetNSGLContext (myGlfwWindow);
+#elif defined (_WIN32)
+  return glfwGetWGLContext (myGlfwWindow);
+#else
+  return glfwGetGLXContext (myGlfwWindow);
+#endif
+}
+
+// ================================================================
+// Function : IsMapped
+// Purpose  :
+// ================================================================
+Standard_Boolean GlfwOcctWindow::IsMapped() const
+{
+  return glfwGetWindowAttrib (myGlfwWindow, GLFW_VISIBLE) != 0;
+}
+
+// ================================================================
+// Function : Map
+// Purpose  :
+// ================================================================
+void GlfwOcctWindow::Map() const
+{
+  glfwShowWindow (myGlfwWindow);
+}
+
+// ================================================================
+// Function : Unmap
+// Purpose  :
+// ================================================================
+void GlfwOcctWindow::Unmap() const
+{
+  glfwHideWindow (myGlfwWindow);
+}
+
+// ================================================================
+// Function : DoResize
+// Purpose  :
+// ================================================================
+Aspect_TypeOfResize GlfwOcctWindow::DoResize() const
+{
+  if (glfwGetWindowAttrib (myGlfwWindow, GLFW_VISIBLE) == 1)
+  {
+    int anXPos = 0, anYPos = 0, aWidth = 0, aHeight = 0;
+    glfwGetWindowPos (myGlfwWindow, &anXPos, &anYPos);
+    glfwGetWindowSize(myGlfwWindow, &aWidth, &aHeight);
+    *const_cast<Standard_Integer*>(&myXLeft  ) = anXPos;
+    *const_cast<Standard_Integer*>(&myXRight ) = anXPos + aWidth;
+    *const_cast<Standard_Integer*>(&myYTop   ) = anYPos;
+    *const_cast<Standard_Integer*>(&myYBottom) = anYPos + aHeight;
+  }
+  return Aspect_TOR_UNKNOWN;
+}
+
+// ================================================================
+// Function : CursorPosition
+// Purpose  :
+// ================================================================
+Graphic3d_Vec2i GlfwOcctWindow::CursorPosition() const
+{
+  Graphic3d_Vec2d aPos;
+  glfwGetCursorPos (myGlfwWindow, &aPos.x(), &aPos.y());
+  return Graphic3d_Vec2i ((int )aPos.x(), (int )aPos.y());
+}