From 3d8d3259e1cf5a7d88e5d1e530cc8c9bf9140734 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Thu, 14 Aug 2025 18:21:00 +0200
Subject: feat: I am going to throw my computer out a window

---
 src/states/simulation_state.cpp | 93 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 90 insertions(+), 3 deletions(-)

(limited to 'src/states/simulation_state.cpp')

diff --git a/src/states/simulation_state.cpp b/src/states/simulation_state.cpp
index 7e9cb76..fc235ff 100644
--- a/src/states/simulation_state.cpp
+++ b/src/states/simulation_state.cpp
@@ -1,14 +1,18 @@
 #include "simulation_state.h"
 #include "rendering/renderer.h"
 #include "core/application.h"
+#include "core/window.h"
+#include "core/event.h"
 
 #include <imgui.h>
+#include <GLFW/glfw3.h>
 
 namespace Donut
 {
     void SimulationState::on_enter()
     {
         DONUT_INFO("Entering Simulation State");
+        m_initialized = true;
     }
     
     void SimulationState::on_exit()
@@ -18,23 +22,79 @@ namespace Donut
     
     void SimulationState::on_update(float delta_time)
     {
+        
+        m_engine.update_window_dimensions();
+        m_engine.update_physics(delta_time);
+        
+        if (m_engine.get_camera().is_dragging()) 
+        {
+            GLFWwindow* window = static_cast<GLFWwindow*>(Application::get().get_window().get_native_window());
+            double xpos, ypos;
+            glfwGetCursorPos(window, &xpos, &ypos);
+            m_engine.get_camera().process_orbital_mouse_move(xpos, ypos);
+        }
     }
     
     void SimulationState::on_render()
     {
-        Renderer::set_clear_color({ 0.0f, 0.0f, 0.0f, 1.0f });
-        Renderer::clear();
+        if (!m_initialized) return;
+        
+        RenderCommand::set_clear_color(glm::vec4(0.0f, 0.0f, 0.0f, 1.0f));
+        RenderCommand::clear();
+        
+        m_engine.generate_grid(m_engine.get_objects());
+        
+        glm::mat4 view = glm::lookAt(m_engine.get_camera().get_orbital_position(), m_engine.get_camera().get_target(), glm::vec3(0,1,0));
+        glm::mat4 proj = glm::perspective(glm::radians(60.0f), float(m_engine.get_width())/m_engine.get_height(), 1e9f, 1e14f);
+        glm::mat4 view_proj = proj * view;
+        
+        m_engine.draw_grid(view_proj);
+        
+        RenderCommand::set_viewport(0, 0, m_engine.get_width(), m_engine.get_height());
+        m_engine.dispatch_compute(m_engine.get_camera());
+        m_engine.draw_full_screen_quad();
     }
     
     void SimulationState::on_event(Event& event)
     {
+        if (!m_initialized) return;
+        
+        if (event.get_event_type() == EventType::MouseButtonPressed)
+        {
+            MouseButtonPressedEvent& e = (MouseButtonPressedEvent&)event;
+            int button = e.get_mouse_button();
+            
+            m_engine.get_camera().process_orbital_mouse_button(button, GLFW_PRESS, 0);
+        }
+        else if (event.get_event_type() == EventType::MouseButtonReleased)
+        {
+            MouseButtonReleasedEvent& e = (MouseButtonReleasedEvent&)event;
+            int button = e.get_mouse_button();
+            m_engine.get_camera().process_orbital_mouse_button(button, GLFW_RELEASE, 0);
+        }
+        
+        if (event.get_event_type() == EventType::MouseScrolled)
+        {
+            MouseScrolledEvent& e = (MouseScrolledEvent&)event;
+            m_engine.get_camera().process_orbital_scroll(e.get_x_offset(), e.get_y_offset());
+        }
+        
+        if (event.get_event_type() == EventType::KeyPressed)
+        {
+            KeyPressedEvent& e = (KeyPressedEvent&)event;
+            if (e.get_key_code() == GLFW_KEY_G)
+            {
+                m_engine.set_gravity(!m_engine.get_gravity());
+                DONUT_INFO("Gravity turned {}", m_engine.get_gravity() ? "ON" : "OFF");
+            }
+        }
     }
     
     void SimulationState::on_im_ui_render()
     {
         ImGui::Begin("Simulation Controls");
         
-        ImGui::Text("Simulation State");
+        ImGui::Text("Black Hole Simulation");
         if (ImGui::Button("Back to Config"))
             Application::get().get_state_manager().switch_to_state("Config");
 
@@ -43,6 +103,33 @@ namespace Donut
         ImGui::Text("Simulation Info:");
         ImGui::Text("FPS: %.1f", ImGui::GetIO().Framerate);
         ImGui::Text("Frame Time: %.3f ms", 1000.0f / ImGui::GetIO().Framerate);
+        ImGui::Text("Resolution: %dx%d", m_engine.get_width(), m_engine.get_height());
+        ImGui::Text("Compute Resolution: %dx%d", m_engine.get_compute_width(), m_engine.get_compute_height());
+        ImGui::Text("Objects: %zu", m_engine.get_objects().size());
+        
+        ImGui::Separator();
+        
+        ImGui::Text("Controls:");
+        ImGui::Text("Left Mouse: Orbit camera");
+        ImGui::Text("Scroll: Zoom in/out");
+        ImGui::Text("G: Toggle gravity");
+        ImGui::Text("Right Mouse: Enable gravity (hold)");
+        
+        ImGui::Separator();
+        
+        ImGui::Text("Physics:");
+        bool gravity = m_engine.get_gravity();
+        if (ImGui::Checkbox("Gravity Enabled", &gravity))
+            m_engine.set_gravity(gravity);
+        
+        ImGui::Text("Camera:");
+        ImGui::Text("Position: (%.2e, %.2e, %.2e)", 
+                   m_engine.get_camera().get_orbital_position().x, 
+                   m_engine.get_camera().get_orbital_position().y, 
+                   m_engine.get_camera().get_orbital_position().z);
+        ImGui::Text("Radius: %.2e", m_engine.get_camera().get_radius());
+        ImGui::Text("Azimuth: %.2f", m_engine.get_camera().get_azimuth());
+        ImGui::Text("Elevation: %.2f", m_engine.get_camera().get_elevation());
         
         ImGui::End();
     }
-- 
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