From a6655eebe2a69ee427264bd43df5747851ed96df Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Fri, 15 Aug 2025 03:18:29 +0200
Subject: feat: complete first geodesic 3D raytracing

---
 src/engine/engine.h | 87 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 46 insertions(+), 41 deletions(-)

(limited to 'src/engine/engine.h')

diff --git a/src/engine/engine.h b/src/engine/engine.h
index 6f90efb..39791c1 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -2,10 +2,6 @@
 
 #include <vector>
 #include <iostream>
-#include <GLFW/glfw3.h>
-#include <glm/glm.hpp>
-#include <glm/gtc/matrix_transform.hpp>
-#include <glm/gtc/type_ptr.hpp>
 #include <fstream>
 #include <sstream>
 #include <chrono>
@@ -15,16 +11,27 @@
 #include "core/camera.h"
 #include "rendering/renderer.h"
 #include "rendering/shader.h"
-#include "rendering/texture.h"
 #include "rendering/vertex_array.h"
+#include "rendering/texture.h"
 #include "rendering/uniform_buffer.h"
+#include "rendering/texture_manager.h"
+
+#include <GLFW/glfw3.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+#define _USE_MATH_DEFINES
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
 
 namespace Donut
 {
     const double c = 299792458.0;
     const double G = 6.67430e-11;
 
-    struct BlackHole 
+    struct BlackHole
     {
         glm::vec3 m_position;
         double m_mass;
@@ -32,13 +39,12 @@ namespace Donut
         double m_rs;
 
         BlackHole(glm::vec3 pos, float mass) 
-            : m_position(pos),
-              m_mass(mass) 
+            : m_position(pos), m_mass(mass)
         {
             m_rs = 2.0 * G * m_mass / (c * c);
         }
 
-        bool intercept(float px, float py, float pz) const 
+        bool intercept(float px, float py, float pz) const
         {
             double dx = double(px) - double(m_position.x);
             double dy = double(py) - double(m_position.y);
@@ -48,11 +54,11 @@ namespace Donut
         }
     };
 
-    struct ObjectData 
+    struct ObjectData
     {
         glm::vec4 m_pos_radius;
         glm::vec4 m_color;
-        float m_mass;
+        float     m_mass;
         glm::vec3 m_velocity = glm::vec3(0.0f, 0.0f, 0.0f);
     };
 
@@ -62,8 +68,6 @@ namespace Donut
         Engine();
         ~Engine() = default;
 
-        void generate_grid(const std::vector<ObjectData>& objects);
-        void draw_grid(const glm::mat4& view_proj);
         void draw_full_screen_quad();
         void dispatch_compute(const Camera& cam);
         void upload_camera_ubo(const Camera& cam);
@@ -73,46 +77,47 @@ namespace Donut
         void update_physics(float delta_time);
         void update_window_dimensions();
 
-              Camera& get_camera()       { return m_camera; }
-        const Camera& get_camera() const { return m_camera; }
-        
-        const std::vector<ObjectData>& get_objects() const { return m_objects; }
-              std::vector<ObjectData>& get_objects()       { return m_objects; }
-        
-        bool get_gravity() const       { return m_gravity;    }
-        void set_gravity(bool gravity) { m_gravity = gravity; }
-        
-        int get_width()         const { return m_width;         }
-        int get_height()        const { return m_height;        }
-        int get_compute_width()  const { return m_compute_width;  }
-        int get_compute_height() const { return m_compute_height; }
+        int get_width()  const { return m_width;  }
+        int get_height() const { return m_height; }
+
+        std::vector<ObjectData>& get_objects() { return m_objects; }
+        BlackHole&               get_sag_a()    { return m_sag_a;    }
+        Camera&                  get_camera()  { return m_camera;  }
+        bool&                    get_gravity() { return m_gravity; }
 
+        void  update_performance(float delta_time);
+        void  set_target_fps(int fps)        { m_target_fps = fps;                             }
+        int   get_target_fps()         const { return m_target_fps;                            }
+        float get_current_fps()        const { return m_current_fps;                           }
+        void  set_compute_height(int height) { m_compute_height = height;                      }
+        int   get_compute_height()     const { return m_compute_height;                        }
+        int   get_compute_width()      const { return (m_width * m_compute_height) / m_height; }
+        void  update_compute_dimensions();
     private:
-        std::string create_basic_vertex_shader();
-        std::string create_basic_fragment_shader();
-        std::string load_compute_shader(const std::string& path);
+        Ref<Shader> create_compute_program(const char* path);
+        std::pair<Ref<VertexArray>, Ref<Texture2D>> quad_vao();
     private:
-        Ref<Shader>        m_grid_shader;
-        Ref<Shader>        m_quad_shader;
-        Ref<Shader>        m_compute_shader;
-        Ref<Texture2D>     m_texture;
         Ref<VertexArray>   m_quad_vao;
-        Ref<VertexArray>   m_grid_vao;
+        Ref<Texture2D>     m_texture;
+        Ref<Shader>        m_shader_program;
+        Ref<Shader>        m_compute_program;
         Ref<UniformBuffer> m_camera_ubo;
         Ref<UniformBuffer> m_disk_ubo;
         Ref<UniformBuffer> m_objects_ubo;
-        
-        int   m_grid_index_count = 0;
+
         int   m_width;
         int   m_height;
-        int   m_compute_width;
-        int   m_compute_height;
-        float m_width_scale = 100000000000.0f;
-        float m_height_scale = 75000000000.0f;
+        float m_width_f = 100*10e10f;
+        float m_height_f = 75*10e10f;
+
+        int   m_target_fps     = 60;
+        float m_current_fps    = 60.0f;
+        float m_last_frame_time = 0.0f;
+        int   m_compute_height = 320;
 
         std::vector<ObjectData> m_objects;
         BlackHole               m_sag_a;
         Camera                  m_camera;
         bool                    m_gravity = false;
     };
-}
+};
-- 
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