Added glfwSetWindowMonitor.

include/GLFW/glfw3.h

@@ -1617,10 +1617,34 @@ GLFWAPI void glfwHideWindow(GLFWwindow* window);
  *
  *  @note This function may only be called from the main thread.
  *
+ *  @sa glfwSetWindowMonitor
+ *
  *  @ingroup window
  */
 GLFWAPI GLFWmonitor* glfwGetWindowMonitor(GLFWwindow* window);
 
+/*! @brief Sets the monitor that the window uses for full screen mode.
+ *
+ *  This function sets the monitor that the specified window uses for full
+ *  screen mode, or if no monitor is specified, makes it windowed mode.
+ *
+ *  The specified width and height are used as the new size of a windowed mode
+ *  window or, if a monitor is specified, used to find a suitable video mode for
+ *  the monitor the window will become full screen on.
+ *
+ *  @param[in] window The window whose monitor to set or unset.
+ *  @param[in] monitor The monitor, or `NULL` to make it windowed mode.
+ *  @param[in] width The desired width, in screen coordinates, of the window or
+ *  video mode.
+ *  @param[in] height The desired height, in screen coordinates, of the window or
+ *  video mode.
+ *
+ *  @sa glfwGetWindowMonitor
+ *
+ *  @ingroup window
+ */
+GLFWAPI void glfwSetWindowMonitor(GLFWwindow* window, GLFWmonitor* monitor, int width, int height);
+
 /*! @brief Returns an attribute of the specified window.
  *
  *  This function returns an attribute of the specified window.  There are many

src/cocoa_window.m

@@ -1151,6 +1151,12 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     _glfwInputWindowVisibility(window, GL_FALSE);
 }
 
+void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
+                                   _GLFWmonitor* monitor,
+                                   int width, int height)
+{
+}
+
 void _glfwPlatformPollEvents(void)
 {
     for (;;)

src/internal.h

@@ -564,6 +564,11 @@ void _glfwPlatformShowWindow(_GLFWwindow* window);
  */
 void _glfwPlatformHideWindow(_GLFWwindow* window);
 
+/*! @copydoc glfwSetWindowMonitor
+ *  @ingroup platform
+ */
+void _glfwPlatformSetWindowMonitor(_GLFWwindow* window, _GLFWmonitor* monitor, int width, int height);
+
 /*! @copydoc glfwPollEvents
  *  @ingroup platform
  */
@@ -742,6 +747,10 @@ void _glfwInputCursorEnter(_GLFWwindow* window, int entered);
  */
 void _glfwInputMonitorChange(void);
 
+/*! @ingroup event
+ */
+void _glfwInputWindowMonitorChange(_GLFWwindow* window, _GLFWmonitor* monitor);
+
 /*! @brief Notifies shared code of an error.
  *  @param[in] error The error code most suitable for the error.
  *  @param[in] format The `printf` style format string of the error

src/monitor.c

@@ -156,6 +156,11 @@ void _glfwInputMonitorChange(void)
     _glfwFreeMonitors(monitors, monitorCount);
 }
 
+void _glfwInputWindowMonitorChange(_GLFWwindow* window, _GLFWmonitor* monitor)
+{
+    window->monitor = monitor;
+}
+
 
 //////////////////////////////////////////////////////////////////////////
 //////                       GLFW internal API                      //////

src/win32_window.c

@@ -35,6 +35,37 @@
 #define _GLFW_KEY_INVALID -2
 
 
+// Returns the window style for the specified window configuration
+//
+static getWindowStyle(const _GLFWwndconfig* wndconfig)
+{
+    DWORD style = WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
+
+    if (wndconfig->decorated && wndconfig->monitor == NULL)
+    {
+        style |= WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
+
+        if (wndconfig->resizable)
+            style |= WS_MAXIMIZEBOX | WS_SIZEBOX;
+    }
+    else
+        style |= WS_POPUP;
+
+    return style;
+}
+
+// Returns the extended window style for the specified window configuration
+//
+static getWindowExStyle(const _GLFWwndconfig* wndconfig)
+{
+    DWORD style = WS_EX_APPWINDOW;
+
+    if (wndconfig->decorated && wndconfig->monitor == NULL)
+        style |= WS_EX_WINDOWEDGE;
+
+    return style;
+}
+
 // Updates the cursor clip rect
 //
 static void updateClipRect(_GLFWwindow* window)
@@ -880,32 +911,17 @@ static int createWindow(_GLFWwindow* window,
     int xpos, ypos, fullWidth, fullHeight;
     WCHAR* wideTitle;
 
-    window->win32.dwStyle = WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
+    window->win32.dwStyle = getWindowStyle(wndconfig);
-    window->win32.dwExStyle = WS_EX_APPWINDOW;
+    window->win32.dwExStyle = getWindowExStyle(wndconfig);
 
     if (window->monitor)
     {
-        window->win32.dwStyle |= WS_POPUP;
-
         _glfwPlatformGetMonitorPos(wndconfig->monitor, &xpos, &ypos);
         fullWidth  = wndconfig->width;
         fullHeight = wndconfig->height;
     }
     else
     {
-        if (wndconfig->decorated)
-        {
-            window->win32.dwStyle |= WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
-
-            if (wndconfig->resizable)
-            {
-                window->win32.dwStyle |= WS_MAXIMIZEBOX | WS_SIZEBOX;
-                window->win32.dwExStyle |= WS_EX_WINDOWEDGE;
-            }
-        }
-        else
-            window->win32.dwStyle |= WS_POPUP;
-
         xpos = CW_USEDEFAULT;
         ypos = CW_USEDEFAULT;
 
@@ -1178,6 +1194,55 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     ShowWindow(window->win32.handle, SW_HIDE);
 }
 
+void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
+                                   _GLFWmonitor* monitor,
+                                   int width, int height)
+{
+    if (window->monitor)
+        _glfwRestoreVideoMode(window->monitor);
+
+    _glfwInputWindowMonitorChange(window, monitor);
+
+    // Update window styles
+    {
+        _GLFWwndconfig wndconfig;
+        wndconfig.resizable = window->resizable;
+        wndconfig.decorated = window->decorated;
+        wndconfig.monitor   = monitor;
+
+        window->win32.dwStyle = getWindowStyle(&wndconfig);
+        window->win32.dwExStyle = getWindowExStyle(&wndconfig);
+
+        SetWindowLongPtr(window->win32.handle,
+                         GWL_STYLE, window->win32.dwStyle);
+        SetWindowLongPtr(window->win32.handle,
+                         GWL_EXSTYLE, window->win32.dwExStyle);
+    }
+
+    if (window->monitor)
+    {
+        GLFWvidmode mode;
+        int xpos, ypos;
+
+        _glfwSetVideoMode(window->monitor, &window->videoMode);
+        _glfwPlatformGetVideoMode(window->monitor, &mode);
+        _glfwPlatformGetMonitorPos(window->monitor, &xpos, &ypos);
+
+        SetWindowPos(window->win32.handle, HWND_TOPMOST,
+                     xpos, ypos, mode.width, mode.height,
+                     SWP_FRAMECHANGED);
+    }
+    else
+    {
+        int fullWidth, fullHeight;
+        getFullWindowSize(window, width, height, &fullWidth, &fullHeight);
+
+        SetWindowPos(window->win32.handle, HWND_TOPMOST,
+                     0, 0, fullWidth, fullHeight,
+                     SWP_NOMOVE | SWP_NOZORDER | SWP_FRAMECHANGED);
+    }
+}
+
 void _glfwPlatformPollEvents(void)
 {
     MSG msg;

src/window.c

@@ -498,11 +498,8 @@ GLFWAPI void glfwSetWindowSize(GLFWwindow* handle, int width, int height)
     if (window->iconified)
         return;
 
-    if (window->monitor)
-    {
     window->videoMode.width  = width;
     window->videoMode.height = height;
-    }
 
     _glfwPlatformSetWindowSize(window, width, height);
 }
@@ -636,6 +633,29 @@ GLFWAPI GLFWmonitor* glfwGetWindowMonitor(GLFWwindow* handle)
     return (GLFWmonitor*) window->monitor;
 }
 
+GLFWAPI void glfwSetWindowMonitor(GLFWwindow* wh,
+                                  GLFWmonitor* mh,
+                                  int width, int height)
+{
+    _GLFWwindow* window = (_GLFWwindow*) wh;
+    _GLFWmonitor* monitor = (_GLFWmonitor*) mh;
+    _GLFW_REQUIRE_INIT();
+
+    if (window->monitor == monitor)
+    {
+        glfwSetWindowSize(wh, width, height);
+        return;
+    }
+
+    if (window->iconified)
+        return;
+
+    window->videoMode.width  = width;
+    window->videoMode.height = height;
+
+    _glfwPlatformSetWindowMonitor(window, monitor, width, height);
+}
+
 GLFWAPI void glfwSetWindowUserPointer(GLFWwindow* handle, void* pointer)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;

src/x11_window.c

@@ -1370,6 +1370,19 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     XFlush(_glfw.x11.display);
 }
 
+void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
+                                   _GLFWmonitor* monitor,
+                                   int width, int height)
+{
+    if (window->monitor)
+        leaveFullscreenMode(window);
+
+    _glfwInputWindowMonitorChange(window, monitor);
+
+    if (window->monitor)
+        enterFullscreenMode(window);
+}
+
 void _glfwPlatformPollEvents(void)
 {
     int count = XPending(_glfw.x11.display);

tests/events.c

@@ -385,6 +385,32 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action,
             printf("(( closing %s ))\n", slot->closeable ? "enabled" : "disabled");
             break;
         }
+
+        case GLFW_KEY_ENTER:
+        {
+            if (mods == GLFW_MOD_ALT)
+            {
+                GLFWmonitor* monitor = glfwGetWindowMonitor(window);
+                if (monitor)
+                {
+                    printf("(( switching to windowed mode ))\n");
+                    glfwSetWindowMonitor(window, NULL, 640, 480);
+                }
+                else
+                {
+                    GLFWmonitor* monitor = glfwGetPrimaryMonitor();
+                    const GLFWvidmode* mode = glfwGetVideoMode(monitor);
+
+                    printf("(( switching to %ix%i full screen mode on %s ))\n",
+                           mode->width, mode->height,
+                           glfwGetMonitorName(monitor));
+
+                    glfwSetWindowMonitor(window, monitor, mode->width, mode->height);
+                }
+            }
+
+            break;
+        }
     }
 }