Add example event listener on player_footstep.

Signed-off-by: aixxe <me@aixxe.net>

README.md

@@ -5,9 +5,11 @@ Internal project base for Counter-Strike: Source on Linux. Includes full OpenGL
 ### Features
 * Retrieves interfaces directly from the *s_pInterfaceRegs* linked list.
 * ImGui drawing and input handling via *ILauncherMgr* virtual hooks.
+* Engine drawing with *ISurface* functions via *IEngineVGui::Paint* hook.
 * *IBaseClientDLL::CreateMove* hook with *CUserCmd* checksum validation.
 * *CInput* and *CGlobalVars* pointers retrieved from IBaseClientDLL virtuals.
 * Can easily be unloaded, modified and reloaded without restarting the game.
+* Includes an example game event listener in a self-contained class.
 
 ### Requirements
 

src/Basehook.cpp

@@ -20,6 +20,7 @@
 
 #include "Basehook.h"
 #include "Hooks/Hooks.h"
+#include "Events/TestListener.h"
 
 ICvar* cvar = nullptr;
 IPanel* panel = nullptr;
@@ -51,6 +52,8 @@ std::unique_ptr<VMTHook> enginevgui_hook;
 std::unique_ptr<VMTHook> modelrender_hook;
 std::unique_ptr<VMTHook> inputinternal_hook;
 
+std::unique_ptr<TestEventListener> testevent;
+
 extern "C" void __attribute__((constructor)) css_basehook_open() {
 	// Get class pointers from game libraries using partial interface versions.
 	cvar = GetInterface<ICvar>("bin/libvstdlib.so", "VEngineCvar0");
@@ -118,6 +121,9 @@ extern "C" void __attribute__((constructor)) css_basehook_open() {
 	globalvars = **reinterpret_cast<CGlobalVarsBase***>(
 		clientdll_hook->GetOriginalFunction<uintptr_t>(11) + 8
 	);
+
+	// Register an event listener.
+	testevent = std::make_unique<TestEventListener>("player_footstep");
 }
 
 extern "C" void __attribute__((destructor)) css_basehook_close() {

src/Events/TestListener.h

@@ -0,0 +1,23 @@
+#pragma once
+
+class TestEventListener: public IGameEventListener2 {
+	public:
+		TestEventListener(const char* name) {
+			// Register self as an event listener.
+			gameevents->AddListener(this, name, false);
+		};
+
+		~TestEventListener() {
+			// Unregister when destructor is called.
+			gameevents->RemoveListener(this);
+		}
+
+		void FireGameEvent(IGameEvent* event) {
+			// Print text to console when event is fired.
+			cvar->ConsoleColorPrintf(Color(150, 255, 150), "Event fired: %s\n", event->GetName());
+		}
+
+		int GetEventDebugID() override {
+			return EVENT_DEBUG_ID_INIT;
+		};
+};