feat: input class for abstracting SDL_Input functions

engine/CMakeLists.txt

@@ -5,6 +5,8 @@ set(SOURCES
   src/IO/file_manager.cpp
   src/renderer/debug.cpp
 
+  src/input/input.cpp
+
   src/scene/scene.cpp
   src/window/window.cpp
 

engine/include/engine/input/input.h

@@ -0,0 +1,29 @@
+#ifndef ENGINE_INPUT_H_
+#define ENGINE_INPUT_H_
+
+#include <SDL3/SDL.h>
+#include <glm/glm.hpp>
+
+#include "engine/time/timestep.h"
+
+#include "engine/export.h"
+
+namespace Core {
+
+class ENGINE_API Input {
+public:
+    Input() = delete;
+private:
+    friend class Engine;
+    static void Update(Timestep dt);
+public:
+    [[nodiscard]] static glm::vec2 GetRelativeMouse();
+    [[nodiscard]] static bool IsKeyPressed(SDL_Scancode keyCode);
+private:
+    static bool* s_keys_state;
+    static int s_keys_state_size;
+};
+
+}
+
+#endif // ENGINE_INPUT_H_

engine/src/input/input.cpp

@@ -0,0 +1,24 @@
+#include "engine/input/input.h"
+
+namespace Core {
+
+bool* Input::s_keys_state = nullptr;
+int Input::s_keys_state_size = 0;
+
+// Engine only function
+void Input::Update(Timestep dt) {
+    s_keys_state = (bool*)SDL_GetKeyboardState(&s_keys_state_size);
+}
+
+glm::vec2 Input::GetRelativeMouse() {
+    glm::vec2 mouse;
+    SDL_GetRelativeMouseState(&mouse.x, &mouse.y);
+    return mouse;
+}
+
+bool Input::IsKeyPressed(SDL_Scancode keyCode) {
+    assert(keyCode < s_keys_state_size && "Key is out of bounds of the key input state");
+    return s_keys_state[keyCode];
+}
+
+}

engine/src/renderer/core.cpp

@@ -6,6 +6,7 @@
 #include "engine/renderer/wavefront.h"
 
 #include "engine/time/timestep.h"
+#include "engine/input/input.h"
 
 namespace Core {
 
@@ -34,6 +35,7 @@ void Engine::Run(std::unique_ptr<IApplication> app) {
 
         m_window->ProcessEvents();
 
+        Input::Update(dt);
         m_app->OnUpdate(dt);
 
         m_renderer->Render();