Merge branch 'master' into loek/audio

3 files changed, 274 insertions, 0 deletions

diff --git a/src/crepe/system/CMakeLists.txt b/src/crepe/system/CMakeLists.txt
index f507b90..6b2e099 100644
--- a/src/crepe/system/CMakeLists.txt
+++ b/src/crepe/system/CMakeLists.txt
@@ -7,6 +7,7 @@ target_sources(crepe PUBLIC
 	RenderSystem.cpp
 	AudioSystem.cpp
 	AnimatorSystem.cpp
+	InputSystem.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -17,4 +18,5 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	RenderSystem.h
 	AudioSystem.h
 	AnimatorSystem.h
+	InputSystem.h
 )
diff --git a/src/crepe/system/InputSystem.cpp b/src/crepe/system/InputSystem.cpp
new file mode 100644
index 0000000..7cc8d30
--- /dev/null
+++ b/src/crepe/system/InputSystem.cpp
@@ -0,0 +1,187 @@
+#include "../api/Button.h"
+#include "../manager/ComponentManager.h"
+#include "../manager/EventManager.h"
+
+#include "InputSystem.h"
+
+using namespace crepe;
+
+void InputSystem::update() {
+	ComponentManager & mgr = this->mediator.component_manager;
+	EventManager & event_mgr = this->mediator.event_manager;
+	std::vector<SDLContext::EventData> event_list = SDLContext::get_instance().get_events();
+	RefVector<Button> buttons = mgr.get_components_by_type<Button>();
+	RefVector<Camera> cameras = mgr.get_components_by_type<Camera>();
+	OptionalRef<Camera> curr_cam_ref;
+	// Find the active camera
+	for (Camera & cam : cameras) {
+		if (!cam.active) continue;
+		curr_cam_ref = cam;
+		break;
+	}
+	if (!curr_cam_ref) return;
+	Camera & current_cam = curr_cam_ref;
+	RefVector<Transform> transform_vec
+		= mgr.get_components_by_id<Transform>(current_cam.game_object_id);
+	Transform & cam_transform = transform_vec.front().get();
+	int camera_origin_x
+		= cam_transform.position.x + current_cam.offset.x - (current_cam.viewport_size.x / 2);
+	int camera_origin_y
+		= cam_transform.position.y + current_cam.offset.y - (current_cam.viewport_size.y / 2);
+
+	for (const SDLContext::EventData & event : event_list) {
+		int world_mouse_x = event.mouse_position.x + camera_origin_x;
+		int world_mouse_y = event.mouse_position.y + camera_origin_y;
+		// check if the mouse is within the viewport
+		bool mouse_in_viewport
+			= !(world_mouse_x < camera_origin_x
+				|| world_mouse_x > camera_origin_x + current_cam.viewport_size.x
+				|| world_mouse_y < camera_origin_y
+				|| world_mouse_y > camera_origin_y + current_cam.viewport_size.y);
+
+		switch (event.event_type) {
+			case SDLContext::EventType::KEYDOWN:
+				event_mgr.queue_event<KeyPressEvent>(KeyPressEvent{
+					.repeat = event.key_repeat,
+					.key = event.key,
+				});
+				break;
+			case SDLContext::EventType::KEYUP:
+				event_mgr.queue_event<KeyReleaseEvent>(KeyReleaseEvent{
+					.key = event.key,
+				});
+				break;
+			case SDLContext::EventType::MOUSEDOWN:
+				if (!mouse_in_viewport) {
+					break;
+				}
+				event_mgr.queue_event<MousePressEvent>(MousePressEvent{
+					.mouse_x = world_mouse_x,
+					.mouse_y = world_mouse_y,
+					.button = event.mouse_button,
+				});
+				this->last_mouse_down_position = {world_mouse_x, world_mouse_y};
+				this->last_mouse_button = event.mouse_button;
+				break;
+			case SDLContext::EventType::MOUSEUP: {
+				if (!mouse_in_viewport) {
+					break;
+				}
+				event_mgr.queue_event<MouseReleaseEvent>(MouseReleaseEvent{
+					.mouse_x = world_mouse_x,
+					.mouse_y = world_mouse_y,
+					.button = event.mouse_button,
+				});
+				//check if its a click by checking the last button down
+				int delta_x = world_mouse_x - this->last_mouse_down_position.x;
+				int delta_y = world_mouse_y - this->last_mouse_down_position.y;
+
+				if (this->last_mouse_button == event.mouse_button
+					&& std::abs(delta_x) <= click_tolerance
+					&& std::abs(delta_y) <= click_tolerance) {
+					event_mgr.queue_event<MouseClickEvent>(MouseClickEvent{
+						.mouse_x = world_mouse_x,
+						.mouse_y = world_mouse_y,
+						.button = event.mouse_button,
+					});
+
+					this->handle_click(event.mouse_button, world_mouse_x, world_mouse_y);
+				}
+			} break;
+			case SDLContext::EventType::MOUSEMOVE:
+				if (!mouse_in_viewport) {
+					break;
+				}
+				event_mgr.queue_event<MouseMoveEvent>(MouseMoveEvent{
+					.mouse_x = world_mouse_x,
+					.mouse_y = world_mouse_y,
+					.delta_x = event.rel_mouse_move.x,
+					.delta_y = event.rel_mouse_move.y,
+				});
+				this->handle_move(event, world_mouse_x, world_mouse_y);
+				break;
+			case SDLContext::EventType::MOUSEWHEEL:
+				event_mgr.queue_event<MouseScrollEvent>(MouseScrollEvent{
+					.mouse_x = world_mouse_x,
+					.mouse_y = world_mouse_y,
+					.scroll_direction = event.scroll_direction,
+					.scroll_delta = event.scroll_delta,
+				});
+				break;
+			case SDLContext::EventType::SHUTDOWN:
+				event_mgr.queue_event<ShutDownEvent>(ShutDownEvent{});
+				break;
+			default:
+				break;
+		}
+	}
+}
+void InputSystem::handle_move(const SDLContext::EventData & event_data,
+							  const int world_mouse_x, const int world_mouse_y) {
+	ComponentManager & mgr = this->mediator.component_manager;
+
+	RefVector<Button> buttons = mgr.get_components_by_type<Button>();
+
+	for (Button & button : buttons) {
+		RefVector<Transform> transform_vec
+			= mgr.get_components_by_id<Transform>(button.game_object_id);
+		Transform & transform(transform_vec.front().get());
+
+		bool was_hovering = button.hover;
+		if (button.active
+			&& this->is_mouse_inside_button(world_mouse_x, world_mouse_y, button, transform)) {
+			button.hover = true;
+			if (!was_hovering && button.on_mouse_enter) {
+				button.on_mouse_enter();
+			}
+		} else {
+			button.hover = false;
+			// Trigger the on_exit callback if the hover state just changed to false
+			if (was_hovering && button.on_mouse_exit) {
+				button.on_mouse_exit();
+			}
+		}
+	}
+}
+
+void InputSystem::handle_click(const MouseButton & mouse_button, const int world_mouse_x,
+							   const int world_mouse_y) {
+	ComponentManager & mgr = this->mediator.component_manager;
+
+	RefVector<Button> buttons = mgr.get_components_by_type<Button>();
+
+	for (Button & button : buttons) {
+		RefVector<Transform> transform_vec
+			= mgr.get_components_by_id<Transform>(button.game_object_id);
+		Transform & transform = transform_vec.front().get();
+
+		if (button.active
+			&& this->is_mouse_inside_button(world_mouse_x, world_mouse_y, button, transform)) {
+			this->handle_button_press(button);
+		}
+	}
+}
+
+bool InputSystem::is_mouse_inside_button(const int mouse_x, const int mouse_y,
+										 const Button & button, const Transform & transform) {
+	int actual_x = transform.position.x + button.offset.x;
+	int actual_y = transform.position.y + button.offset.y;
+
+	int half_width = button.dimensions.x / 2;
+	int half_height = button.dimensions.y / 2;
+
+	// Check if the mouse is within the button's boundaries
+	return mouse_x >= actual_x - half_width && mouse_x <= actual_x + half_width
+		   && mouse_y >= actual_y - half_height && mouse_y <= actual_y + half_height;
+}
+
+void InputSystem::handle_button_press(Button & button) {
+	if (button.is_toggle) {
+		if (!button.is_pressed && button.on_click) {
+			button.on_click();
+		}
+		button.is_pressed = !button.is_pressed;
+	} else if (button.on_click) {
+		button.on_click();
+	}
+}
diff --git a/src/crepe/system/InputSystem.h b/src/crepe/system/InputSystem.h
new file mode 100644
index 0000000..87e86f8
--- /dev/null
+++ b/src/crepe/system/InputSystem.h
@@ -0,0 +1,85 @@
+#pragma once
+
+#include "../facade/SDLContext.h"
+#include "../types.h"
+#include "../util/OptionalRef.h"
+
+#include "System.h"
+
+namespace crepe {
+
+class Camera;
+class Button;
+class Transform;
+
+/**
+ * \brief Handles the processing of input events created by SDLContext
+ *
+ * This system processes events such as mouse clicks, mouse movement, and keyboard
+ * actions. It is responsible for detecting interactions with UI buttons and
+ * passing the corresponding events to the registered listeners.
+ */
+class InputSystem : public System {
+public:
+	using System::System;
+
+	/**
+	 * \brief Updates the system, processing all input events.
+	 * This method processes all events and triggers corresponding actions.
+	 */
+	void update() override;
+
+private:
+	//! Stores the last position of the mouse when the button was pressed.
+	ivec2 last_mouse_down_position;
+	// TODO: specify world/hud space and make regular `vec2`
+
+	//! Stores the last mouse button pressed.
+	MouseButton last_mouse_button = MouseButton::NONE;
+
+	//! The maximum allowable distance between mouse down and mouse up to register as a click.
+	const int click_tolerance = 5;
+
+	/**
+	* \brief Handles the mouse click event.
+	* \param mouse_button The mouse button involved in the click.
+	* \param world_mouse_x The X coordinate of the mouse in world space.
+	* \param world_mouse_y The Y coordinate of the mouse in world space.
+	*
+	* This method processes the mouse click event and triggers the corresponding button action.
+	*/
+	void handle_click(const MouseButton & mouse_button, const int world_mouse_x,
+					  const int world_mouse_y);
+
+	/**
+	* \brief Handles the mouse movement event.
+	* \param event_data The event data containing information about the mouse movement.
+	* \param world_mouse_x The X coordinate of the mouse in world space.
+	* \param world_mouse_y The Y coordinate of the mouse in world space.
+	*
+	* This method processes the mouse movement event and updates the button hover state.
+	*/
+	void handle_move(const SDLContext::EventData & event_data, const int world_mouse_x,
+					 const int world_mouse_y);
+
+	/**
+	* \brief Checks if the mouse position is inside the bounds of the button.
+	* \param world_mouse_x The X coordinate of the mouse in world space.
+	* \param world_mouse_y The Y coordinate of the mouse in world space.
+	* \param button The button to check.
+	* \param transform The transform component of the button.
+	* \return True if the mouse is inside the button, false otherwise.
+	*/
+	bool is_mouse_inside_button(const int world_mouse_x, const int world_mouse_y,
+								const Button & button, const Transform & transform);
+
+	/**
+	* \brief Handles the button press event, calling the on_click callback if necessary.
+	* \param button The button being pressed.
+	*
+	* This method triggers the on_click action for the button when it is pressed.
+	*/
+	void handle_button_press(Button & button);
+};
+
+} // namespace crepe