feat: state manager

1 files changed, 28 insertions, 299 deletions

diff --git a/src/core/application.cpp b/src/core/application.cpp
index c4c0e71..f878c71 100644
--- a/src/core/application.cpp
+++ b/src/core/application.cpp
@@ -1,15 +1,9 @@
 #include "application.h"
-
 #include "rendering/renderer.h"
-#include "rendering/vertex_array.h"
-#include "rendering/vertex_buffer.h"
-#include "rendering/index_buffer.h"
-#include "rendering/shader.h"
-#include "rendering/texture.h"
 
-#include <iostream>
-#include <glm/glm.hpp>
-#include <glm/gtc/matrix_transform.hpp>
+#include "states/config_state.h"
+#include "states/simulation_state.h"
+
 #include <GLFW/glfw3.h>
 
 namespace Donut
@@ -22,7 +16,6 @@ namespace Donut
         s_instance = this;
 
         m_window = std::make_unique<Window>(name, width, height);
-        
         m_window->set_event_callback([this](Event& event) 
         {
             on_event(event);
@@ -69,90 +62,40 @@ namespace Donut
         dispatcher.dispatch<WindowResizeEvent>([this, &event](WindowResizeEvent& e) 
         {
             if (e.get_width() == 0 || e.get_height() == 0)
-            {
                 m_minimized = true;
-            }
             else
-            {
                 m_minimized = false;
-            }
             
             Renderer::on_window_resize(e.get_width(), e.get_height());
-            
-            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) 
         {
-            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)
+            if (e.get_key_code() == GLFW_KEY_1)
+            {
+                m_state_manager->switch_to_state("Config");
+                event.handled = true;
                 return true;
-                
-            if (m_first_mouse)
+            }
+            else if (e.get_key_code() == GLFW_KEY_2)
             {
-                m_last_x = e.get_x();
-                m_last_y = e.get_y();
-                m_first_mouse = false;
+                m_state_manager->switch_to_state("Simulation");
+                event.handled = true;
+                return true;
             }
-
-            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)
+            else if (e.get_key_code() == GLFW_KEY_3)
             {
-                m_mouse_dragging = true;
-                m_first_mouse = true;
+                m_state_manager->switch_to_state("Menu");
+                event.handled = true;
+                return 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;
-        });
+        m_state_manager->on_event(event);
     }
 
     void Application::on_init()     
@@ -163,93 +106,17 @@ namespace Donut
         Renderer::on_window_resize(1280, 720);
         RenderCommand::set_face_culling(false);
 
-        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, -0.5f,  1.0f, 0.0f, 0.0f, 1.0f,  0.0f, 0.0f,
-             0.5f, -0.5f, -0.5f,  0.0f, 1.0f, 0.0f, 1.0f,  1.0f, 0.0f,
-             0.5f,  0.5f, -0.5f,  0.0f, 0.0f, 1.0f, 1.0f,  1.0f, 1.0f,
-            -0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f, 1.0f,  0.0f, 1.0f,
-            -0.5f, -0.5f,  0.5f,  1.0f, 0.0f, 1.0f, 1.0f,  0.0f, 0.0f,
-             0.5f, -0.5f,  0.5f,  0.0f, 1.0f, 1.0f, 1.0f,  1.0f, 0.0f,
-             0.5f,  0.5f,  0.5f,  0.5f, 0.5f, 0.5f, 1.0f,  1.0f, 1.0f,
-            -0.5f,  0.5f,  0.5f,  1.0f, 1.0f, 1.0f, 1.0f,  0.0f, 1.0f
-        };
-
-        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)));
-        
-        VertexBufferLayout layout;
-        layout.push<float>(3);
-        layout.push<float>(4);
-        layout.push<float>(2);
-        m_vertex_buffer->set_layout(layout);
-
-        m_vertex_array->add_vertex_buffer(m_vertex_buffer);
-
-        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/textured.glsl"));
-
-        m_texture = Texture2D::create(256, 256);
-        
-        uint32_t* pixel_data = new uint32_t[256 * 256];
-        for (int y = 0; y < 256; y++)
-        {
-            for (int x = 0; x < 256; x++)
-            {
-                float u = (float)x / 256.0f;
-                float v = (float)y / 256.0f;
-                
-                float wave = sin(u * 10.0f) * cos(v * 10.0f);
-                wave = (wave + 1.0f) * 0.5f;
-                
-                uint8_t r = (uint8_t)(wave * 255);
-                uint8_t g = (uint8_t)((1.0f - wave) * 255);
-                uint8_t b = (uint8_t)((u + v) * 0.5f * 255);
-                uint8_t a = 255;
-                
-                pixel_data[y * 256 + x] = (a << 24) | (b << 16) | (g << 8) | r;
-            }
-        }
-        
-        m_texture->set_data(pixel_data, 256 * 256 * 4);
-        delete[] pixel_data;
-
-        m_compute_shader = std::shared_ptr<Shader>(Shader::create("assets/texture_processor.glsl"));
-        
-        if (!m_compute_shader)
-        {
-            DONUT_WARN("Failed to create compute shader! Falling back to CPU texture generation.");
-            m_use_compute_shader = false;
-        }
-        else
-            DONUT_INFO("Compute shader created successfully!");
-        
-        m_processed_texture = Texture2D::create(256, 256);
-        m_compute_brightness = 0.0f;
-        m_compute_contrast = 1.0f;
-        m_compute_saturation = 1.0f;
-        m_use_compute_shader = true;
+        m_state_manager = std::make_unique<StateManager>();
+        m_state_manager->register_state("Config", std::make_unique<ConfigState>());
+        m_state_manager->register_state("Simulation", std::make_unique<SimulationState>());
+        m_state_manager->switch_to_state("Config");
     }
 
     void Application::on_shutdown() 
     { 
+        if (m_state_manager)
+            m_state_manager->shutdown();
+            
         Renderer::shutdown();
         Logger::shutdown();
     }
@@ -260,149 +127,11 @@ namespace Donut
         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);    
-        }
-        
-        static bool c_key_pressed = false;
-        if (m_keys[GLFW_KEY_C] && !c_key_pressed)
-        {
-            m_use_compute_shader = !m_use_compute_shader;
-            DONUT_INFO("Compute shader: {}", (m_use_compute_shader ? "ON" : "OFF"));
-            c_key_pressed = true;
-        }
-        if (!m_keys[GLFW_KEY_C])
-            c_key_pressed = false;
-        if (m_keys[GLFW_KEY_UP])
-            m_compute_brightness += m_delta_time * 0.5f;
-        if (m_keys[GLFW_KEY_DOWN])
-            m_compute_brightness -= m_delta_time * 0.5f;
-        if (m_keys[GLFW_KEY_LEFT])
-            m_compute_contrast -= m_delta_time * 0.5f;
-        if (m_keys[GLFW_KEY_RIGHT])
-            m_compute_contrast += m_delta_time * 0.5f;
-        if (m_keys[GLFW_KEY_Q])
-            m_compute_saturation -= m_delta_time * 0.5f;
-        if (m_keys[GLFW_KEY_E])
-            m_compute_saturation += m_delta_time * 0.5f;
-        
-        m_compute_brightness = glm::clamp(m_compute_brightness, -1.0f, 1.0f);
-        m_compute_contrast = glm::clamp(m_compute_contrast, 0.1f, 3.0f);
-        m_compute_saturation = glm::clamp(m_compute_saturation, 0.0f, 2.0f);
-        
-        static float status_timer = 0.0f;
-        status_timer += m_delta_time;
-        if (status_timer > 2.0f)
-        {
-            DONUT_INFO("Compute Shader Status:\nBrightness: {}\nContrast: {}\nSaturation: {}",
-                       m_compute_brightness, m_compute_contrast, m_compute_saturation);
-            status_timer = 0.0f;
-        }
-        
-        update_texture();
+        m_state_manager->update(m_delta_time);
     }
 
     void Application::on_render()
     {
-        Renderer::set_clear_color({ 0.0f, 0.0f, 0.0f, 1.0f });
-        Renderer::clear();
-
-        if (m_use_compute_shader && 
-            m_processed_texture)
-        {
-            m_processed_texture->bind(0);
-            m_shader->set_int("u_Texture", 0);
-        }
-        else if (m_texture)
-        {
-            m_texture->bind(0);
-            m_shader->set_int("u_Texture", 0);
-        }
-
-        glm::mat4 view_projection = m_camera ? m_camera->get_view_projection_matrix() : glm::mat4(1.0f);
-        
-        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);
-    }
-
-    void Application::update_texture()
-    {
-        if (!m_texture)
-            return;
-            
-        m_texture_time += m_delta_time;
-        
-        if (m_use_compute_shader && m_compute_shader && m_processed_texture)
-        {
-            m_compute_shader->bind();
-            m_texture->bind(0);
-            m_compute_shader->set_int("u_InputTexture", 0);
-            m_processed_texture->bind_as_image(1, false);
-            m_compute_shader->set_float2("u_TextureSize", glm::vec2(256.0f, 256.0f));
-            m_compute_shader->set_float("u_Time", m_texture_time);
-            m_compute_shader->set_float("u_Brightness", m_compute_brightness);
-            m_compute_shader->set_float("u_Contrast", m_compute_contrast);
-            m_compute_shader->set_float("u_Saturation", m_compute_saturation);
-            m_compute_shader->dispatch(16, 16, 1);
-            m_compute_shader->memory_barrier(IMAGE_ACCESS_BARRIER_BIT);
-        }
-        else
-        {
-            uint32_t* pixel_data = new uint32_t[256 * 256];
-            for (int y = 0; y < 256; y++)
-            {
-                for (int x = 0; x < 256; x++)
-                {
-                    float time = m_texture_time * 2.0f;
-                    float u = (float)x / 256.0f;
-                    float v = (float)y / 256.0f;
-                    
-                    float wave = sin(u * 10.0f + time) * cos(v * 10.0f + time * 0.5f);
-                    wave = (wave + 1.0f) * 0.5f;
-                    
-                    uint8_t r = (uint8_t)(wave * 255);
-                    uint8_t g = (uint8_t)((1.0f - wave) * 255);
-                    uint8_t b = (uint8_t)((u + v) * 0.5f * 255);
-                    uint8_t a = 255;
-                    
-                    pixel_data[y * 256 + x] = (a << 24) | (b << 16) | (g << 8) | r;
-                }
-            }
-            
-            m_texture->set_data(pixel_data, 256 * 256 * 4);
-            delete[] pixel_data;
-        }
+        m_state_manager->render();
     }
-}
+};