Made the X keyboard extension required.

CMakeLists.txt

@@ -156,8 +156,9 @@ if (_GLFW_X11)
 
     # Check for Xkb (X keyboard extension)
     if (X11_Xkb_FOUND)
-        set(_GLFW_HAS_XKB 1)
         list(APPEND glfw_INCLUDE_DIR ${X11_Xkb_INCLUDE_PATH})
+    else()
+        message(FATAL_ERROR "The X keyboard extension was not found")
     endif() 
 
     find_library(RT_LIBRARY rt)

src/config.h.in

@@ -62,9 +62,6 @@
 // Define this to 1 if Xf86VidMode is available
 #cmakedefine _GLFW_HAS_XF86VIDMODE
 
-// Define this to 1 if Xkb is available
-#cmakedefine _GLFW_HAS_XKB
-
 // Define this to 1 if glXGetProcAddress is available
 #cmakedefine _GLFW_HAS_GLXGETPROCADDRESS
 // Define this to 1 if glXGetProcAddressARB is available

src/x11_init.c

@@ -51,11 +51,7 @@ static int keyCodeToGLFWKeyCode(int keyCode)
     // Note: This way we always force "NumLock = ON", which is intentional
     // since the returned key code should correspond to a physical
     // location.
-#if defined(_GLFW_HAS_XKB)
     keySym = XkbKeycodeToKeysym(_glfw.x11.display, keyCode, 1, 0);
-#else
-    keySym = XKeycodeToKeysym(_glfw.x11.display, keyCode, 1);
-#endif
     switch (keySym)
     {
         case XK_KP_0:           return GLFW_KEY_KP_0;
@@ -78,12 +74,7 @@ static int keyCodeToGLFWKeyCode(int keyCode)
     // Now try pimary keysym for function keys (non-printable keys). These
     // should not be layout dependent (i.e. US layout and international
     // layouts should give the same result).
-#if defined(_GLFW_HAS_XKB)
     keySym = XkbKeycodeToKeysym(_glfw.x11.display, keyCode, 0, 0);
-#else
-    keySym = XKeycodeToKeysym(_glfw.x11.display, keyCode, 0);
-#endif
-
     switch (keySym)
     {
         case XK_Escape:         return GLFW_KEY_ESCAPE;
@@ -230,20 +221,16 @@ static int keyCodeToGLFWKeyCode(int keyCode)
 
 static void updateKeyCodeLUT(void)
 {
-    int keyCode;
+    int i, keyCode, keyCodeGLFW;
+    char name[XkbKeyNameLength + 1];
+    XkbDescPtr descr;
 
     // Clear the LUT
     for (keyCode = 0;  keyCode < 256;  keyCode++)
         _glfw.x11.keyCodeLUT[keyCode] = -1;
 
-#if defined(_GLFW_HAS_XKB)
-    // If the Xkb extension is available, use it to determine physical key
-    // locations independently of the current keyboard layout
-    if (_glfw.x11.xkb.available)
-    {
-        int i, keyCodeGLFW;
-        char name[XkbKeyNameLength + 1];
-        XkbDescPtr descr;
+    // Use XKB to determine physical key locations independently of the current
+    // keyboard layout
 
     // Get keyboard description
     descr = XkbGetKeyboard(_glfw.x11.display,
@@ -320,8 +307,6 @@ static void updateKeyCodeLUT(void)
 
     // Free the keyboard description
     XkbFreeKeyboard(descr, 0, True);
-    }
-#endif /* _GLFW_HAS_XKB */
 
     // Translate the un-translated key codes using traditional X11 KeySym
     // lookups
@@ -530,19 +515,19 @@ static GLboolean initDisplay(void)
 #endif /*_GLFW_HAS_XRANDR*/
 
     // Check if Xkb is supported on this display
-#if defined(_GLFW_HAS_XKB)
     _glfw.x11.xkb.versionMajor = 1;
     _glfw.x11.xkb.versionMinor = 0;
-    _glfw.x11.xkb.available =
-        XkbQueryExtension(_glfw.x11.display,
+    if (!XkbQueryExtension(_glfw.x11.display,
                            &_glfw.x11.xkb.majorOpcode,
                            &_glfw.x11.xkb.eventBase,
                            &_glfw.x11.xkb.errorBase,
                            &_glfw.x11.xkb.versionMajor,
-                          &_glfw.x11.xkb.versionMinor);
-#else
-    _glfw.x11.xkb.available = GL_FALSE;
-#endif /* _GLFW_HAS_XKB */
+                           &_glfw.x11.xkb.versionMinor))
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "X11: The keyboard extension is not available");
+        return GL_FALSE;
+    }
 
     // Update the key code LUT
     // FIXME: We should listen to XkbMapNotify events to track changes to
@@ -698,9 +683,6 @@ const char* _glfwPlatformGetVersionString(void)
 #if !defined(_GLFW_HAS_XRANDR) && !defined(_GLFW_HAS_XF86VIDMODE)
         " no-mode-switching-support"
 #endif
-#if defined(_GLFW_HAS_XKB)
-        " Xkb"
-#endif
 #if defined(_GLFW_HAS_GLXGETPROCADDRESS)
         " glXGetProcAddress"
 #elif defined(_GLFW_HAS_GLXGETPROCADDRESSARB)

src/x11_platform.h

@@ -49,9 +49,7 @@
 #endif
 
 // The Xkb extension provides improved keyboard support
-#if defined(_GLFW_HAS_XKB)
- #include <X11/XKBlib.h>
-#endif
+#include <X11/XKBlib.h>
 
 #if defined(_GLFW_GLX)
  #define _GLFW_X11_CONTEXT_VISUAL window->glx.visual
@@ -155,7 +153,6 @@ typedef struct _GLFWlibraryX11
     } randr;
 
     struct {
-        GLboolean   available;
         int         majorOpcode;
         int         eventBase;
         int         errorBase;