goldberg_emulator/overlay_experimental/X11_Hook.cpp

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2019-08-31 18:49:46 +00:00
#include "X11_Hook.h"
#include "Renderer_Detector.h"
#include "../dll/dll.h"
#ifndef NO_OVERLAY
#include <imgui.h>
#include <impls/imgui_impl_x11.h>
#include <dlfcn.h>
#include <unistd.h>
#include <fstream>
extern int ImGui_ImplX11_EventHandler(XEvent &event);
X11_Hook* X11_Hook::_inst = nullptr;
bool X11_Hook::start_hook()
{
bool res = true;
if (!hooked)
{
res = false;
std::ifstream flibrary("/proc/self/maps");
std::string line;
while( std::getline(flibrary, line) )
{
if( strcasestr(line.c_str(), DLL_NAME) != nullptr )
{
_library = dlopen(line.substr(line.find('/')).c_str(), RTLD_NOW);
if( _library != nullptr )
{
// Hook only this
_XEventsQueued = (decltype(_XEventsQueued))dlsym(_library, "XEventsQueued");
// Thoses are needed to ignore some events when overlay is on
_XPeekEvent = (decltype(_XPeekEvent))dlsym(_library, "XPeekEvent");
_XNextEvent = (decltype(_XNextEvent))dlsym(_library, "XNextEvent");
_XKeysymToKeycode = (decltype(_XKeysymToKeycode))dlsym(_library, "XKeysymToKeycode");
_XLookupKeysym = (decltype(_XLookupKeysym))dlsym(_library, "XLookupKeysym");
if( _XEventsQueued != nullptr && _XPeekEvent != nullptr
&& _XNextEvent != nullptr && _XKeysymToKeycode != nullptr
&& _XLookupKeysym != nullptr )
{
PRINT_DEBUG("Hooked X11\n");
hooked = true;
BeginHook();
HookFuncs(
std::make_pair<void**, void*>(&(void*&)_XEventsQueued, (void*)&X11_Hook::MyXEventsQueued)
);
EndHook();
break;
}
dlclose(_library);
}
}
}
}
return res;
}
void X11_Hook::resetRenderState()
{
if (initialized)
{
initialized = false;
ImGui_ImplX11_Shutdown();
}
}
void X11_Hook::prepareForOverlay(Display *display)
{
if (!initialized)
{
ImGui_ImplX11_Init(display);
ImGuiIO &io = ImGui::GetIO();
io.KeyMap[ImGuiKey_Tab] = _XKeysymToKeycode(display, XK_Tab);
io.KeyMap[ImGuiKey_LeftArrow] = _XKeysymToKeycode(display, XK_Left);
io.KeyMap[ImGuiKey_RightArrow] = _XKeysymToKeycode(display, XK_Right);
io.KeyMap[ImGuiKey_UpArrow] = _XKeysymToKeycode(display, XK_Up);
io.KeyMap[ImGuiKey_DownArrow] = _XKeysymToKeycode(display, XK_Down);
io.KeyMap[ImGuiKey_PageUp] = _XKeysymToKeycode(display, XK_Prior);
io.KeyMap[ImGuiKey_PageDown] = _XKeysymToKeycode(display, XK_Next);
io.KeyMap[ImGuiKey_Home] = _XKeysymToKeycode(display, XK_Home);
io.KeyMap[ImGuiKey_End] = _XKeysymToKeycode(display, XK_End);
io.KeyMap[ImGuiKey_Insert] = _XKeysymToKeycode(display, XK_Insert);
io.KeyMap[ImGuiKey_Delete] = _XKeysymToKeycode(display, XK_Delete);
io.KeyMap[ImGuiKey_Backspace] = _XKeysymToKeycode(display, XK_BackSpace);
io.KeyMap[ImGuiKey_Space] = _XKeysymToKeycode(display, XK_space);
io.KeyMap[ImGuiKey_Enter] = _XKeysymToKeycode(display, XK_Return);
io.KeyMap[ImGuiKey_Escape] = _XKeysymToKeycode(display, XK_Escape);
io.KeyMap[ImGuiKey_A] = _XKeysymToKeycode(display, XK_A);
io.KeyMap[ImGuiKey_C] = _XKeysymToKeycode(display, XK_C);
io.KeyMap[ImGuiKey_V] = _XKeysymToKeycode(display, XK_V);
io.KeyMap[ImGuiKey_X] = _XKeysymToKeycode(display, XK_X);
io.KeyMap[ImGuiKey_Y] = _XKeysymToKeycode(display, XK_Y);
io.KeyMap[ImGuiKey_Z] = _XKeysymToKeycode(display, XK_Z);
initialized = true;
}
ImGui_ImplX11_NewFrame();
}
/////////////////////////////////////////////////////////////////////////////////////
// X11 window hooks
bool IgnoreEvent(XEvent &event)
{
switch(event.type)
{
// Keyboard
case KeyPress: case KeyRelease:
// MouseButton
case ButtonPress: case ButtonRelease:
// Mouse move
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case MotionNotify:
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return true;
}
return false;
}
int X11_Hook::MyXEventsQueued(Display *display, int mode)
{
static Time prev_time = {};
X11_Hook* inst = X11_Hook::Inst();
XEvent event = {};
int res = inst->_XEventsQueued(display, mode);
if( res > 0 )
{
/// The XPeekEvent function returns the first event from the event queue,
/// but it does not remove the event from the queue. If the queue is
/// empty, XPeekEvent flushes the output buffer and blocks until an event
/// is received.
inst->_XPeekEvent(display, &event);
Steam_Overlay* overlay = get_steam_client()->steam_overlay;
bool show = overlay->ShowOverlay();
// Is the event is a key press
if (event.type == KeyPress)
{
// Tab is pressed and was not pressed before
if (event.xkey.keycode == inst->_XKeysymToKeycode(display, XK_Tab) && event.xkey.state & ShiftMask)
{
// if key TAB is help, don't make the overlay flicker :p
if( event.xkey.time != prev_time)
{
overlay->ShowOverlay(!overlay->ShowOverlay());
if (overlay->ShowOverlay())
show = true;
}
}
}
else if(event.type == KeyRelease && event.xkey.keycode == inst->_XKeysymToKeycode(display, XK_Tab))
{
prev_time = event.xkey.time;
}
if (show)
{
ImGui_ImplX11_EventHandler(event);
if (IgnoreEvent(event))
{
inst->_XNextEvent(display, &event);
res = 0;
}
}
}
// XEventsQueued returns the num of events available.
// Usually, games tend to read all events queued before calling again XEventsQueued
// making us unavailable to intercept undesired events
return res;
}
/////////////////////////////////////////////////////////////////////////////////////
X11_Hook::X11_Hook() :
initialized(false),
hooked(false)
{
//_library = dlopen(DLL_NAME, RTLD_NOW);
}
X11_Hook::~X11_Hook()
{
PRINT_DEBUG("X11 Hook removed\n");
resetRenderState();
//dlclose(_library);
_inst = nullptr;
}
X11_Hook* X11_Hook::Inst()
{
if (_inst == nullptr)
_inst = new X11_Hook;
return _inst;
}
const char* X11_Hook::get_lib_name() const
{
return DLL_NAME;
}
#endif//NO_OVERLAY