feat: camera

6 files changed, 377 insertions, 19 deletions

diff --git a/src/core/application.cpp b/src/core/application.cpp
index 92bf211..b80ad84 100644
--- a/src/core/application.cpp
+++ b/src/core/application.cpp
@@ -9,6 +9,7 @@
 #include <iostream>
 #include <glm/glm.hpp>
 #include <glm/gtc/matrix_transform.hpp>
+#include <GLFW/glfw3.h>
 
 namespace Donut
 {
@@ -70,14 +71,78 @@ namespace Donut
             else
                 m_minimized = false;
             
+            if (m_camera)
+                m_camera->set_projection(45.0f, (float)e.get_width() / (float)e.get_height(), 0.1f, 100.0f);
+            
+            event.handled = true;
+            return true;
+        });
+        
+        dispatcher.dispatch<WindowFocusEvent>([this, &event](WindowFocusEvent& e) 
+        {
+            m_first_mouse = true;
+            m_mouse_dragging = false;
+            event.handled = true;
+            return true;
+        });
+        
+        dispatcher.dispatch<WindowLostFocusEvent>([this, &event](WindowLostFocusEvent& e) 
+        {
+            m_mouse_dragging = false;
             event.handled = true;
             return true;
         });
         
         dispatcher.dispatch<KeyPressedEvent>([this, &event](KeyPressedEvent& e) 
         {
-            if (e.get_key_code() == 256)
-                close();
+            m_keys[e.get_key_code()] = true;
+            return true;
+        });
+        
+        dispatcher.dispatch<KeyReleasedEvent>([this, &event](KeyReleasedEvent& e) 
+        {
+            m_keys[e.get_key_code()] = false;
+            return true;
+        });
+        
+        dispatcher.dispatch<MouseMovedEvent>([this, &event](MouseMovedEvent& e) 
+        {
+            if (!m_mouse_dragging)
+                return true;
+                
+            if (m_first_mouse)
+            {
+                m_last_x = e.get_x();
+                m_last_y = e.get_y();
+                m_first_mouse = false;
+            }
+
+            float x_offset = m_last_x - e.get_x();
+            float y_offset = e.get_y() - m_last_y;
+
+            m_last_x = e.get_x();
+            m_last_y = e.get_y();
+
+            if (m_camera)
+                m_camera->on_mouse_move(x_offset, y_offset);
+            
+            return true;
+        });
+        
+        dispatcher.dispatch<MouseButtonPressedEvent>([this, &event](MouseButtonPressedEvent& e) 
+        {
+            if (e.get_mouse_button() == GLFW_MOUSE_BUTTON_LEFT)
+            {
+                m_mouse_dragging = true;
+                m_first_mouse = true;
+            }
+            return true;
+        });
+        
+        dispatcher.dispatch<MouseButtonReleasedEvent>([this, &event](MouseButtonReleasedEvent& e) 
+        {
+            if (e.get_mouse_button() == GLFW_MOUSE_BUTTON_LEFT)
+                m_mouse_dragging = false;
             return true;
         });
     }
@@ -86,14 +151,32 @@ namespace Donut
     { 
         Renderer::init();
 
-        float vertices[3 * 7] = 
+        m_camera = std::make_unique<Camera>(45.0f, 1280.0f / 720.0f, 0.1f, 100.0f);
+        m_camera->set_position({ 0.0f, 0.0f, 3.0f });
+        m_camera->set_mouse_sensitivity(0.1f);
+        m_camera->set_movement_speed(5.0f);
+
+        float vertices[] = 
         {
-            -0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
-             0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
-             0.0f,  0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f
+            -0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f, 1.0f,
+             0.5f, -0.5f, -0.5f,  0.0f, 1.0f, 0.0f, 1.0f,
+             0.5f,  0.5f, -0.5f,  0.0f, 0.0f, 1.0f, 1.0f,
+            -0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f, 1.0f,
+            -0.5f, -0.5f,  0.5f,  1.0f, 0.0f, 1.0f, 1.0f,
+             0.5f, -0.5f,  0.5f,  0.0f, 1.0f, 1.0f, 1.0f,
+             0.5f,  0.5f,  0.5f,  0.5f, 0.5f, 0.5f, 1.0f,
+            -0.5f,  0.5f,  0.5f,  1.0f, 1.0f, 1.0f, 1.0f
         };
 
-        uint32_t indices[3] = { 0, 1, 2 };
+        uint32_t indices[] = 
+        {
+            0, 1, 2,  2, 3, 0,
+            1, 5, 6,  6, 2, 1,
+            5, 4, 7,  7, 6, 5,
+            4, 0, 3,  3, 7, 4,
+            3, 2, 6,  6, 7, 3,
+            4, 5, 1,  1, 0, 4 
+        };
 
         m_vertex_array = std::shared_ptr<VertexArray>(VertexArray::create());
         m_vertex_buffer = std::shared_ptr<VertexBuffer>(VertexBuffer::create(vertices, sizeof(vertices)));
@@ -105,7 +188,7 @@ namespace Donut
 
         m_vertex_array->add_vertex_buffer(m_vertex_buffer);
 
-        m_index_buffer = std::shared_ptr<IndexBuffer>(IndexBuffer::create(indices, 3));
+        m_index_buffer = std::shared_ptr<IndexBuffer>(IndexBuffer::create(indices, 36));
         m_vertex_array->set_index_buffer(m_index_buffer);
 
         m_shader = std::shared_ptr<Shader>(Shader::create("assets/basic.glsl"));
@@ -118,19 +201,55 @@ namespace Donut
 
     void Application::on_update()
     {
+        float current_frame = (float)glfwGetTime();
+        m_delta_time = current_frame - m_last_frame;
+        m_last_frame = current_frame;
+
+        if (m_camera)
+        {
+            if (m_keys[GLFW_KEY_W])
+                m_camera->move_forward(m_delta_time);
+            if (m_keys[GLFW_KEY_S])
+                m_camera->move_backward(m_delta_time);
+            if (m_keys[GLFW_KEY_A])
+                m_camera->move_left(m_delta_time);
+            if (m_keys[GLFW_KEY_D])
+                m_camera->move_right(m_delta_time);
+            if (m_keys[GLFW_KEY_SPACE])
+                m_camera->move_up(m_delta_time);
+            if (m_keys[GLFW_KEY_LEFT_SHIFT])
+                m_camera->move_down(m_delta_time);
+        }
     }
 
     void Application::on_render()
     {
-        Renderer::set_clear_color({ 0.1f, 0.1f, 0.1f, 1.0f });
+        Renderer::set_clear_color({ 0.0f, 0.0f, 0.0f, 1.0f });
         Renderer::clear();
 
-        Renderer::begin_scene();
-
-        glm::mat4 view_projection = glm::ortho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);
+        glm::mat4 view_projection = m_camera ? m_camera->get_view_projection_matrix() : glm::mat4(1.0f);
         
-        Renderer::submit(m_shader, m_vertex_array, glm::mat4(1.0f));
-
-        Renderer::end_scene();
+        glm::vec3 center_pos(0.0f, 0.0f, 0.0f);
+        glm::vec3 right_pos(2.0f, 0.0f, 0.0f);
+        glm::vec3 left_pos(-2.0f, 0.0f, 0.0f);
+        glm::vec3 up_pos(0.0f, 2.0f, 0.0f);
+        glm::vec3 down_pos(0.0f, -2.0f, 0.0f);
+        glm::vec3 forward_pos(0.0f, 0.0f, 2.0f);
+        glm::vec3 back_pos(0.0f, 0.0f, -2.0f);
+        
+        glm::mat4 transform = glm::translate(glm::mat4(1.0f), center_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
+        transform = glm::translate(glm::mat4(1.0f), right_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
+        transform = glm::translate(glm::mat4(1.0f), left_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
+        transform = glm::translate(glm::mat4(1.0f), up_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
+        transform = glm::translate(glm::mat4(1.0f), down_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
+        transform = glm::translate(glm::mat4(1.0f), forward_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
+        transform = glm::translate(glm::mat4(1.0f), back_pos);
+        Renderer::submit(m_shader, m_vertex_array, transform, view_projection);
     }
 }
diff --git a/src/core/application.h b/src/core/application.h
index a860e1c..f78f107 100644
--- a/src/core/application.h
+++ b/src/core/application.h
@@ -2,6 +2,7 @@
 
 #include "window.h"
 #include "event.h"
+#include "camera.h"
 #include <memory>
 #include <functional>
 
@@ -42,6 +43,16 @@ namespace Donut
         std::shared_ptr<VertexBuffer> m_vertex_buffer;
         std::shared_ptr<IndexBuffer> m_index_buffer;
         std::shared_ptr<Shader> m_shader;
+        
+        std::unique_ptr<Camera> m_camera;
+        
+        bool m_keys[1024] = { false };
+        bool m_first_mouse = true;
+        float m_last_x = 0.0f;
+        float m_last_y = 0.0f;
+        float m_delta_time = 0.0f;
+        float m_last_frame = 0.0f;
+        bool m_mouse_dragging = false;
 
         static Application* s_instance;
     };
diff --git a/src/core/camera.cpp b/src/core/camera.cpp
new file mode 100644
index 0000000..bad2919
--- /dev/null
+++ b/src/core/camera.cpp
@@ -0,0 +1,132 @@
+#include "camera.h"
+#include <glm/gtc/quaternion.hpp>
+
+namespace Donut
+{
+    Camera::Camera(float fov, float aspect_ratio, float near_plane, float far_plane)
+        : m_fov(fov), m_aspect_ratio(aspect_ratio), m_near_plane(near_plane), m_far_plane(far_plane)
+    {
+        recalculate_projection_matrix();
+        recalculate_view_matrix();
+    }
+
+    void Camera::set_projection(float fov, float aspect_ratio, float near_plane, float far_plane)
+    {
+        m_fov = fov;
+        m_aspect_ratio = aspect_ratio;
+        m_near_plane = near_plane;
+        m_far_plane = far_plane;
+        recalculate_projection_matrix();
+    }
+
+    void Camera::recalculate_projection_matrix()
+    {
+        m_projection_matrix = glm::perspective(glm::radians(m_fov), m_aspect_ratio, m_near_plane, m_far_plane);
+        m_view_projection_matrix = m_projection_matrix * m_view_matrix;
+    }
+
+    void Camera::recalculate_view_matrix()
+    {
+        float pitch = glm::radians(m_rotation.x);
+        float yaw = glm::radians(m_rotation.y);
+        float roll = glm::radians(m_rotation.z);
+
+        glm::vec3 direction;
+        direction.x = cos(yaw) * cos(pitch);
+        direction.y = sin(pitch);
+        direction.z = sin(yaw) * cos(pitch);
+
+        glm::vec3 front = glm::normalize(direction);
+        glm::vec3 world_up(0.0f, 1.0f, 0.0f);
+        glm::vec3 right = glm::normalize(glm::cross(front, world_up));
+        glm::vec3 up = glm::normalize(glm::cross(right, front));
+
+        m_view_matrix = glm::lookAt(m_position, m_position + front, up);
+        m_view_projection_matrix = m_projection_matrix * m_view_matrix;
+    }
+
+    glm::vec3 Camera::get_forward_direction() const
+    {
+        float pitch = glm::radians(m_rotation.x);
+        float yaw = glm::radians(m_rotation.y);
+
+        glm::vec3 direction;
+        direction.x = cos(yaw) * cos(pitch);
+        direction.y = sin(pitch);
+        direction.z = sin(yaw) * cos(pitch);
+
+        return glm::normalize(direction);
+    }
+
+    glm::vec3 Camera::get_right_direction() const
+    {
+        glm::vec3 world_up(0.0f, 1.0f, 0.0f);
+        return glm::normalize(glm::cross(get_forward_direction(), world_up));
+    }
+
+    glm::vec3 Camera::get_up_direction() const
+    {
+        return glm::normalize(glm::cross(get_right_direction(), get_forward_direction()));
+    }
+
+    void Camera::on_update(float delta_time)
+    {
+    }
+
+    void Camera::on_mouse_move(float x_offset, float y_offset, bool constrain_pitch)
+    {
+        x_offset *= m_mouse_sensitivity;
+        y_offset *= m_mouse_sensitivity;
+
+        m_rotation.y += x_offset;
+        m_rotation.x += y_offset;
+
+        if (constrain_pitch)
+        {
+            if (m_rotation.x > 89.0f)
+                m_rotation.x = 89.0f;
+            if (m_rotation.x < -89.0f)
+                m_rotation.x = -89.0f;
+        }
+
+        recalculate_view_matrix();
+    }
+
+    void Camera::move_forward(float delta_time)
+    {
+        m_position += get_forward_direction() * m_movement_speed * delta_time;
+        recalculate_view_matrix();
+    }
+
+    void Camera::move_backward(float delta_time)
+    {
+        m_position -= get_forward_direction() * m_movement_speed * delta_time;
+        recalculate_view_matrix();
+    }
+
+    void Camera::move_right(float delta_time)
+    {
+        m_position += get_right_direction() * m_movement_speed * delta_time;
+        recalculate_view_matrix();
+    }
+
+    void Camera::move_left(float delta_time)
+    {
+        m_position -= get_right_direction() * m_movement_speed * delta_time;
+        recalculate_view_matrix();
+    }
+
+    void Camera::move_up(float delta_time)
+    {
+        glm::vec3 world_up(0.0f, 1.0f, 0.0f);
+        m_position += world_up * m_movement_speed * delta_time;
+        recalculate_view_matrix();
+    }
+
+    void Camera::move_down(float delta_time)
+    {
+        glm::vec3 world_up(0.0f, 1.0f, 0.0f);
+        m_position -= world_up * m_movement_speed * delta_time;
+        recalculate_view_matrix();
+    }
+}
diff --git a/src/core/camera.h b/src/core/camera.h
new file mode 100644
index 0000000..200c4b0
--- /dev/null
+++ b/src/core/camera.h
@@ -0,0 +1,69 @@
+#pragma once
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+namespace Donut
+{
+    class Camera
+    {
+    public:
+        Camera(float fov = 45.0f, float aspect_ratio = 16.0f / 9.0f, 
+               float near_plane = 0.1f, float far_plane = 100.0f);
+        ~Camera() = default;
+
+        void set_position(const glm::vec3& position) { m_position = position; recalculate_view_matrix(); }
+        void set_rotation(const glm::vec3& rotation) { m_rotation = rotation; recalculate_view_matrix(); }
+        
+        const glm::vec3& get_position() const { return m_position; }
+        const glm::vec3& get_rotation() const { return m_rotation; }
+        
+        glm::vec3 get_forward_direction() const;
+        glm::vec3 get_right_direction()   const;
+        glm::vec3 get_up_direction()      const;
+
+        const glm::mat4& get_projection_matrix()     const { return m_projection_matrix; }
+        const glm::mat4& get_view_matrix()           const { return m_view_matrix; }
+        const glm::mat4& get_view_projection_matrix() const { return m_view_projection_matrix; }
+
+        void set_projection(float fov, float aspect_ratio, float near_plane, float far_plane);
+        
+        void on_update(float delta_time);
+        void on_mouse_move(float x_offset, float y_offset, bool constrain_pitch = true);
+        
+        void move_forward(float delta_time);
+        void move_backward(float delta_time);
+        void move_right(float delta_time);
+        void move_left(float delta_time);
+        void move_up(float delta_time);
+        void move_down(float delta_time);
+
+        void set_mouse_sensitivity(float sensitivity) { m_mouse_sensitivity = sensitivity; }
+        float get_mouse_sensitivity() const { return m_mouse_sensitivity; }
+
+        void set_movement_speed(float speed) { m_movement_speed = speed; }
+        float get_movement_speed() const { return m_movement_speed; }
+
+    private:
+        void recalculate_view_matrix();
+        void recalculate_projection_matrix();
+    private:
+        glm::mat4 m_projection_matrix;
+        glm::mat4 m_view_matrix;
+        glm::mat4 m_view_projection_matrix;
+
+        glm::vec3 m_position = { 0.0f, 0.0f, 3.0f };
+        glm::vec3 m_rotation = { 0.0f, 0.0f, 0.0f };
+
+        float m_fov = 45.0f;
+        float m_aspect_ratio = 16.0f / 9.0f;
+        float m_near_plane = 0.1f;
+        float m_far_plane = 100.0f;
+
+        float m_mouse_sensitivity = 0.1f;
+        float m_movement_speed = 5.0f;
+        bool m_first_mouse = true;
+        float m_last_x = 0.0f;
+        float m_last_y = 0.0f;
+    };
+}
diff --git a/src/core/window.cpp b/src/core/window.cpp
index 77ef885..26c134c 100644
--- a/src/core/window.cpp
+++ b/src/core/window.cpp
@@ -90,6 +90,24 @@ namespace Donut
         return glfwWindowShouldClose(m_window) || m_is_closed;
     }
 
+    void Window::set_cursor_locked(bool locked)
+    {
+        m_cursor_locked = locked;
+        if (locked)
+            glfwSetInputMode(m_window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+        else
+            glfwSetInputMode(m_window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+    }
+
+    void Window::set_cursor_visible(bool visible)
+    {
+        m_cursor_visible = visible;
+        if (visible)
+            glfwSetInputMode(m_window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+        else
+            glfwSetInputMode(m_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
+    }
+
     void Window::glfw_error_callback(int error, const char* description)
     {
         std::cout << "GLFW Error (" << error << "): " << description << std::endl;
diff --git a/src/core/window.h b/src/core/window.h
index 8e9778e..d541b54 100644
--- a/src/core/window.h
+++ b/src/core/window.h
@@ -15,16 +15,24 @@ namespace Donut
         ~Window();
 
         bool should_close() const;
-        void on_update() const;
+        void on_update()    const;
+
+        void set_event_callback(const EventCallbackFn& callback)
+        {
+            m_event_handler.set_event_callback(callback);
+        }
 
-        void set_event_callback(const EventCallbackFn& callback) { m_event_handler.set_event_callback(callback); }
         EventHandler& get_event_handler() { return m_event_handler; }
 
-        unsigned int get_width() const { return m_width; }
+        unsigned int get_width()  const { return m_width; }
         unsigned int get_height() const { return m_height; }
 
         void* get_native_window() const { return m_window; }
 
+        void set_cursor_locked(bool locked);
+        void set_cursor_visible(bool visible);
+        bool is_cursor_locked()  const { return m_cursor_locked; }
+        bool is_cursor_visible() const { return m_cursor_visible; }
     private:
         void init();
         void shutdown();
@@ -39,7 +47,6 @@ namespace Donut
         static void glfw_mouse_button_callback(GLFWwindow* window, int button, int action, int mods);
         static void glfw_mouse_scroll_callback(GLFWwindow* window, double x_offset, double y_offset);
         static void glfw_cursor_pos_callback(GLFWwindow* window, double x_pos, double y_pos);
-
     private:
         GLFWwindow* m_window;
         EventHandler m_event_handler;
@@ -48,5 +55,7 @@ namespace Donut
         unsigned int m_width;
         unsigned int m_height;
         bool m_is_closed;
+        bool m_cursor_locked  = false;
+        bool m_cursor_visible = true;
     };
 }