From 48124315356b105cd835dc3d76458fe07a132dc2 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 29 Aug 2020 21:10:30 +0200
Subject: Add alt+f1 global hotkey to reset window rotation (keyboard mapping
 update not tested)

---
 .gitignore   |  1 +
 README.md    | 10 ++++++----
 src/main.cpp | 37 ++++++++++++++++++++++++++++++++++++-
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/.gitignore b/.gitignore
index dbb08f9..1f413f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ tests/compile_commands.json
 vr-video-player
 window_texture.o
 main.o
+.clangd/
diff --git a/README.md b/README.md
index 8af999a..9bc6c8e 100644
--- a/README.md
+++ b/README.md
@@ -35,10 +35,12 @@ if you want to watch a regular non-stereoscopic video, then run:
 ```
 and click on your video player.
 
-The video might not be in front of you, so to move the video in front of you, you can pull the trigger on the vr controller or press the "W" key while the vr-video-player is focused or press the select/back button on an xbox controller while the application is focused. You can also send the SIGUSR1 signal to the application, using the following command:
-```
-killall -USR1 vr-video-player`
-```
+The video might not be in front of you, so to move the video in front of you, you can do any of the following:
+* Pull the trigger on the vr controller
+* Press "Alt + F1"
+* Press the "W" key while the vr-video-player is focused
+* Press the select/back button on an xbox controller while the application is focused
+* Send a SIGUSR1 signal to the application, using the following command: `killall -USR1 vr-video-player`
 
 You can zoom the view with the Q and E keys when the vr-video-player is focused.
 
diff --git a/src/main.cpp b/src/main.cpp
index 62450ee..c646e82 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -47,6 +47,7 @@ extern "C" {
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtc/type_ptr.hpp>
 #include <X11/Xlib.h>
+#include <X11/XKBlib.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/Xproto.h>
 #include <GL/glxproto.h>
@@ -582,6 +583,24 @@ static int xerror(Display *dpy, XErrorEvent *ee) {
     return 0; /* may call exit */ /* TODO: xerrorxlib(dpy, ee); */
 }
 
+static void grabkeys(Display *display) {
+	unsigned int numlockmask = 0;
+    KeyCode numlock_keycode = XKeysymToKeycode(display, XK_Num_Lock);
+    XModifierKeymap *modmap = XGetModifierMapping(display);
+    for(int i = 0; i < 8; ++i) {
+        for(int j = 0; j < modmap->max_keypermod; ++j) {
+            if(modmap->modifiermap[i * modmap->max_keypermod + j] == numlock_keycode)
+                numlockmask = (1 << i); 
+        }
+    }
+	XFreeModifiermap(modmap);
+    
+	Window root_window = DefaultRootWindow(display);
+    unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
+    for(int i = 0; i < 4; ++i)
+        XGrabKey(display, XKeysymToKeycode(display, XK_F1), Mod1Mask|modifiers[i], root_window, False, GrabModeAsync, GrabModeAsync);
+}
+
 
 //-----------------------------------------------------------------------------
 // Purpose:
@@ -607,7 +626,10 @@ bool CMainApplication::BInit()
 	window_resize_time = SDL_GetTicks();
 	window_resized = false;
 
-	XSelectInput(x_display, src_window_id, StructureNotifyMask);
+	grabkeys(x_display);
+	XSelectInput(x_display, src_window_id, StructureNotifyMask|KeyPressMask|KeyReleaseMask);
+	Bool sup = False;
+	XkbSetDetectableAutoRepeat(x_display, True, &sup);
 
 	if(!XFixesQueryExtension(x_display, &x_fixes_event_base, &x_fixes_error_base)) {
 		fprintf(stderr, "Your x11 server is missing the xfixes extension\n");
@@ -963,6 +985,19 @@ bool CMainApplication::HandleInput()
 		}
 	}
 
+	if (XCheckTypedEvent(x_display, KeyPress, &xev) && XKeycodeToKeysym(x_display, xev.xkey.keycode, 0) == XK_F1 && (xev.xkey.state & Mod1Mask)) {
+		m_bResetRotation = true;
+	}
+
+	if(XCheckTypedEvent(x_display, MappingNotify, &xev)) {
+		XMappingEvent *mapping_ev = &xev.xmapping;
+		XRefreshKeyboardMapping(mapping_ev);
+		if(mapping_ev->request == MappingKeyboard) {
+			fprintf(stderr, "Update keyboard mapping!\n");
+			grabkeys(x_display);
+		}
+	}
+
 	if(!cursor_image_set) {
 		cursor_image_set = true;
 		SetCursorFromX11CursorImage(XFixesGetCursorImage(x_display));
-- 
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