OpenVRBackend: Add support for hacky escape codes in SteamVR

Author: misyltoad

src/Backends/OpenVRBackend.cpp

@@ -1139,7 +1139,46 @@ namespace gamescope
                 {
                     if (m_pIME)
                     {
-                        type_text(m_pIME, vrEvent.data.keyboard.cNewInput);
+                        const char *pchText = vrEvent.data.keyboard.cNewInput;
+                        size_t unStrLen = strlen( pchText );
+                        bool bEscaped = false;
+                        if ( unStrLen > 2 && pchText[0] == '\x1b' && pchText[1] == '[' )
+                        {
+                            bEscaped = true;
+                        }
+
+                        if ( bEscaped )
+                        {
+                            const char chControlChar = pchText[2];
+                            gamescope_input_method_action eAction = GAMESCOPE_INPUT_METHOD_ACTION_NONE;
+                            switch (chControlChar)
+                            {
+                                case 'D': eAction = GAMESCOPE_INPUT_METHOD_ACTION_MOVE_LEFT; break;
+                                case 'C': eAction = GAMESCOPE_INPUT_METHOD_ACTION_MOVE_RIGHT; break;
+                                case 'A': eAction = GAMESCOPE_INPUT_METHOD_ACTION_MOVE_UP; break;
+                                case 'B': eAction = GAMESCOPE_INPUT_METHOD_ACTION_MOVE_DOWN; break;
+                            }
+
+                            if ( eAction != GAMESCOPE_INPUT_METHOD_ACTION_NONE )
+                            {
+                                perform_action( m_pIME, eAction );
+                            }
+                        }
+                        else
+                        {
+                            if ( unStrLen == 1 && pchText[0] == '\n' )
+                            {
+                                perform_action( m_pIME, GAMESCOPE_INPUT_METHOD_ACTION_SUBMIT );
+                            }
+                            else if ( unStrLen == 1 && pchText[0] == '\b' )
+                            {
+                                perform_action( m_pIME, GAMESCOPE_INPUT_METHOD_ACTION_DELETE_LEFT );
+                            }
+                            else
+                            {
+                                type_text( m_pIME, pchText );
+                            }
+                        }
                     }
                     break;
                 }

src/ime.cpp

@@ -18,8 +18,6 @@
 #include <wlr/types/wlr_seat.h>
 #include "wlr_end.hpp"
 
-#include "gamescope-input-method-protocol.h"
-
 struct wlserver_input_method_manager *global_manager = nullptr;
 
 /* The C/C++ standard library doesn't expose a reliable way to decode UTF-8,
@@ -407,7 +405,7 @@ void type_text(struct wlserver_input_method *ime, const char *text)
 	wl_event_source_timer_update(ime->ime_reset_ime_keyboard_event_source, 100 /* ms */);
 }
 
-static void perform_action(struct wlserver_input_method *ime, enum gamescope_input_method_action action)
+void perform_action(struct wlserver_input_method *ime, enum gamescope_input_method_action action)
 {
 	if (actions.count(action) == 0) {
 		ime_log.errorf("unsupported action %d", action);

src/ime.hpp

@@ -3,9 +3,11 @@
 #pragma once
 
 #include "wlserver.hpp"
+#include "gamescope-input-method-protocol.h"
 
 void create_ime_manager(struct wlserver_t *wlserver);
 
 struct wlserver_input_method *create_local_ime();
 void destroy_ime(struct wlserver_input_method * ime);
 void type_text(struct wlserver_input_method *ime, const char *text);
+void perform_action(struct wlserver_input_method *ime, enum gamescope_input_method_action action);