Added GLFW_AUTO_ICONIFY.

By default, full screen windows that lose focus will be iconified and
the video mode will be restored.  This makes it impossible to create
applications spanning multiple monitors.  The GLFW_AUTO_ICONIFY window
hint will allow users to disable this behavior.

Fixes #143.

README.md

@@ -58,6 +58,8 @@ GLFW bundles a number of dependencies in the `deps/` directory.
  - Added `empty` test program for verifying posting of empty events
  - Added `glfwGetWindowFrameSize` for retrieving the size of the frame around
    the client area of a window
+ - Added `GLFW_AUTO_ICONIFY` for controlling whether full screen windows
+   automatically iconify (and restore the previous video mode) on focus loss
  - Added `GLFW_INCLUDE_ES31` for including the OpenGL ES 3.1 header
  - Added *partial and experimental* support for Wayland
  - Bugfix: The debug context attribute was set from `GL_ARB_debug_output` even

docs/news.dox

@@ -33,6 +33,14 @@ GLFW now supports querying the size, on each side, of the frame around the
 client area of a window, with @ref glfwGetWindowFrameSize.
 
 
+@subsection news_31_autoiconify Multi-monitor installation support
+
+GLFW now supports disabling auto-iconification of full screen windows with
+[GLFW_AUTO_ICONIFY](@ref window_hints_wnd).  This is intended for people
+building multi-monitor installations, where you need windows to stay in full
+screen despite losing focus.
+
+
 @section news_30 New features in version 3.0
 
 @subsection news_30_cmake CMake build system

docs/window.dox

@@ -105,17 +105,21 @@ Hints that do not apply to a given type of window or context are ignored.
 
 @subsection window_hints_wnd Window related hints
 
-The `GLFW_RESIZABLE` hint specifies whether the window will be resizable *by the
+The `GLFW_RESIZABLE` hint specifies whether the (windowed mode) window will be
-user*.  The window will still be resizable using the @ref glfwSetWindowSize
+resizable *by the user*.  The window will still be resizable using the @ref
-function.  This hint is ignored for full screen windows.
+glfwSetWindowSize function.  This hint is ignored for full screen windows.
 
-The `GLFW_VISIBLE` hint specifies whether the window will be initially
+The `GLFW_VISIBLE` hint specifies whether the (windowed mode) window will be
-visible.  This hint is ignored for full screen windows.
+initially visible.  This hint is ignored for full screen windows.
 
-The `GLFW_DECORATED` hint specifies whether the window will have window
+The `GLFW_DECORATED` hint specifies whether the (windowed mode) window will have
-decorations such as a border, a close widget, etc.  This hint is ignored for
+window decorations such as a border, a close widget, etc.  This hint is ignored
-full screen windows.  Note that even though a window may lack a close widget, it
+for full screen windows.  Note that even though a window may lack a close
-is usually still possible for the user to generate close events.
+widget, it is usually still possible for the user to generate close events.
+
+The `GLFW_AUTO_ICONIFY` hint specifies whether the (full screen) window
+will automatically iconify and restore the previous video mode on focus loss.
+This hint is ignored for windowed mode windows.
 
 
 @subsection window_hints_fb Framebuffer related hints
@@ -196,6 +200,7 @@ a robustness strategy.
 | `GLFW_RESIZABLE`             | `GL_TRUE`                 | `GL_TRUE` or `GL_FALSE` |
 | `GLFW_VISIBLE`               | `GL_TRUE`                 | `GL_TRUE` or `GL_FALSE` |
 | `GLFW_DECORATED`             | `GL_TRUE`                 | `GL_TRUE` or `GL_FALSE` |
+| `GLFW_AUTO_ICONIFY`          | `GL_TRUE`                 | `GL_TRUE` or `GL_FALSE` |
 | `GLFW_RED_BITS`              | 8                         | 0 to `INT_MAX`          |
 | `GLFW_GREEN_BITS`            | 8                         | 0 to `INT_MAX`          |
 | `GLFW_BLUE_BITS`             | 8                         | 0 to `INT_MAX`          |

include/GLFW/glfw3.h

@@ -497,6 +497,7 @@ extern "C" {
 #define GLFW_RESIZABLE              0x00020003
 #define GLFW_VISIBLE                0x00020004
 #define GLFW_DECORATED              0x00020005
+#define GLFW_AUTO_ICONIFY           0x00020006
 
 #define GLFW_RED_BITS               0x00021001
 #define GLFW_GREEN_BITS             0x00021002

src/internal.h

@@ -152,6 +152,7 @@ struct _GLFWwndconfig
     GLboolean     resizable;
     GLboolean     visible;
     GLboolean     decorated;
+    GLboolean     autoIconify;
     _GLFWmonitor* monitor;
 };
 
@@ -215,6 +216,7 @@ struct _GLFWwindow
     GLboolean           iconified;
     GLboolean           resizable;
     GLboolean           decorated;
+    GLboolean           autoIconify;
     GLboolean           visible;
     GLboolean           closed;
     void*               userPointer;
@@ -319,6 +321,7 @@ struct _GLFWlibrary
         GLboolean   resizable;
         GLboolean   visible;
         GLboolean   decorated;
+        GLboolean   autoIconify;
         int         samples;
         GLboolean   sRGB;
         int         refreshRate;

src/win32_window.c

@@ -436,7 +436,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
                 if (window->cursorMode != GLFW_CURSOR_NORMAL)
                     restoreCursor(window);
 
-                if (window->monitor)
+                if (window->monitor && window->autoIconify)
                 {
                     if (!iconified)
                     {
@@ -455,7 +455,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
                 if (window->cursorMode != GLFW_CURSOR_NORMAL)
                     _glfwPlatformApplyCursorMode(window);
 
-                if (window->monitor)
+                if (window->monitor && window->autoIconify)
                     _glfwSetVideoMode(window->monitor, &window->videoMode);
             }
 

src/window.c

@@ -173,6 +173,7 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height,
     wndconfig.resizable     = _glfw.hints.resizable ? GL_TRUE : GL_FALSE;
     wndconfig.visible       = _glfw.hints.visible ? GL_TRUE : GL_FALSE;
     wndconfig.decorated     = _glfw.hints.decorated ? GL_TRUE : GL_FALSE;
+    wndconfig.autoIconify   = _glfw.hints.autoIconify ? GL_TRUE : GL_FALSE;
     wndconfig.monitor       = (_GLFWmonitor*) monitor;
 
     // Set up desired context config
@@ -207,10 +208,11 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height,
         window->videoMode.refreshRate = Max(_glfw.hints.refreshRate, 0);
     }
 
-    window->monitor    = wndconfig.monitor;
+    window->monitor     = wndconfig.monitor;
-    window->resizable  = wndconfig.resizable;
+    window->resizable   = wndconfig.resizable;
-    window->decorated  = wndconfig.decorated;
+    window->decorated   = wndconfig.decorated;
-    window->cursorMode = GLFW_CURSOR_NORMAL;
+    window->autoIconify = wndconfig.autoIconify;
+    window->cursorMode  = GLFW_CURSOR_NORMAL;
 
     // Save the currently current context so it can be restored later
     previous = _glfwPlatformGetCurrentContext();
@@ -267,9 +269,10 @@ void glfwDefaultWindowHints(void)
     _glfw.hints.minor = 0;
 
     // The default is a visible, resizable window with decorations
-    _glfw.hints.resizable = GL_TRUE;
+    _glfw.hints.resizable   = GL_TRUE;
-    _glfw.hints.visible   = GL_TRUE;
+    _glfw.hints.visible     = GL_TRUE;
-    _glfw.hints.decorated = GL_TRUE;
+    _glfw.hints.decorated   = GL_TRUE;
+    _glfw.hints.autoIconify = GL_TRUE;
 
     // The default is 24 bits of color, 24 bits of depth and 8 bits of stencil
     _glfw.hints.redBits     = 8;
@@ -331,6 +334,9 @@ GLFWAPI void glfwWindowHint(int target, int hint)
         case GLFW_DECORATED:
             _glfw.hints.decorated = hint;
             break;
+        case GLFW_AUTO_ICONIFY:
+            _glfw.hints.autoIconify = hint;
+            break;
         case GLFW_VISIBLE:
             _glfw.hints.visible = hint;
             break;