moving some maths functions to implementation file

9 files changed, 1795 insertions, 0 deletions

diff --git a/bindgen/rust/celeritas-sys/Cargo.lock b/bindgen/rust/celeritas-sys/Cargo.lock
new file mode 100644
index 0000000..de49f83
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diff --git a/bindgen/rust/celeritas-sys/Cargo.toml b/bindgen/rust/celeritas-sys/Cargo.toml
new file mode 100644
index 0000000..6755fb2
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "celeritas-sys"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
+[build-dependencies]
+bindgen = "0.69.4"
diff --git a/bindgen/rust/celeritas-sys/README.md b/bindgen/rust/celeritas-sys/README.md
new file mode 100644
index 0000000..f4b4a01
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/README.md
@@ -0,0 +1,3 @@
+# Rust bindings + examples.
+
+**WIP**: GLFW passthrough to egui
\ No newline at end of file
diff --git a/bindgen/rust/celeritas-sys/build.rs b/bindgen/rust/celeritas-sys/build.rs
new file mode 100644
index 0000000..4f85bc6
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/build.rs
@@ -0,0 +1,54 @@
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    // Tell cargo to look for shared libraries in the specified directory
+    println!("cargo:rustc-link-search=../../../build/macosx/arm64/debug");
+    // println!("cargo:rustc-link-search=../../build/windows/x64/debug");
+
+    // Tell cargo to tell rustc to link the system bzip2
+    // shared library.
+    println!("cargo:rustc-link-lib=core_static");
+    println!("cargo:rustc-link-lib=glfw3");
+
+    // The bindgen::Builder is the main entry point
+    // to bindgen, and lets you build up options for
+    // the resulting bindings.
+    let bindings = bindgen::Builder::default()
+        // The input header we would like to generate
+        // bindings for.
+        .header("../../../include/amalgamation.h")
+        // -- our code
+        .clang_arg("-I../../../src")
+        .clang_arg("-I../../../src/core")
+        .clang_arg("-I../../../src/maths")
+        .clang_arg("-I../../../src/new_render")
+        .clang_arg("-I../../../src/platform")
+        .clang_arg("-I../../../src/ral")
+        .clang_arg("-I../../../src/ral/backends/opengl")
+        .clang_arg("-I../../../src/resources")
+        .clang_arg("-I../../../src/std")
+        .clang_arg("-I../../../src/std/containers")
+        .clang_arg("-I../../../src/systems")
+        // -- dependencies
+        .clang_arg("-I../../../deps/cgltf")
+        .clang_arg("-I../../../deps/glfw-3.3.8/include/GLFW")
+        .clang_arg("-I../../../deps/glad/include")
+        .clang_arg("-I../../../deps/stb_image")
+        .clang_arg("-I../../../deps/stb_image_write")
+        .clang_arg("-I../../../deps/stb_truetype")
+        .generate_inline_functions(true)
+        // Tell cargo to invalidate the built crate whenever any of the
+        // included header files changed.
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+        // Finish the builder and generate the bindings.
+        .generate()
+        // Unwrap the Result and panic on failure.
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}
diff --git a/bindgen/rust/celeritas-sys/examples/glfw.rs b/bindgen/rust/celeritas-sys/examples/glfw.rs
new file mode 100644
index 0000000..0514032
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/examples/glfw.rs
@@ -0,0 +1,224 @@
+use std::ffi::CString;
+use std::ptr::addr_of_mut;
+
+use celeritas::*;
+use egui_backend::egui::{vec2, Pos2, Rect};
+use egui_glfw as egui_backend;
+use egui_glfw::glfw::{fail_on_errors, Context};
+
+use egui_glfw::glfw;
+
+const SCREEN_WIDTH: u32 = 1000;
+const SCREEN_HEIGHT: u32 = 1000;
+
+fn main() {
+    unsafe {
+        let mut glfw = glfw::init(glfw::fail_on_errors!()).unwrap();
+        glfw.window_hint(glfw::WindowHint::ContextVersion(4, 1));
+        glfw.window_hint(glfw::WindowHint::OpenGlForwardCompat(true));
+        glfw.window_hint(glfw::WindowHint::OpenGlProfile(
+            glfw::OpenGlProfileHint::Core,
+        ));
+        glfw.window_hint(glfw::WindowHint::DoubleBuffer(true));
+        glfw.window_hint(glfw::WindowHint::Resizable(false));
+
+        let (mut window, events) = glfw
+            .create_window(
+                SCREEN_WIDTH,
+                SCREEN_HEIGHT,
+                "Egui in GLFW!",
+                glfw::WindowMode::Windowed,
+            )
+            .expect("Failed to create GLFW window.");
+
+        window.set_all_polling(true);
+        window.make_current();
+        // glfw.set_swap_interval(glfw::SwapInterval::None);
+        glfw.set_swap_interval(glfw::SwapInterval::Adaptive);
+
+        gl::load_with(|symbol| window.get_proc_address(symbol) as *const _);
+
+        let window_ptr = window.window_ptr();
+        unsafe {
+            // Cast the window pointer to the expected type
+            let window_ptr = window_ptr as *mut celeritas::GLFWwindow;
+            Core_Bringup(window_ptr);
+        };
+
+        let mut painter = egui_backend::Painter::new(&mut window);
+        let egui_ctx = egui::Context::default();
+
+        let (width, height) = window.get_framebuffer_size();
+        let native_pixels_per_point = window.get_content_scale().0;
+        let native_pixels_per_point = 1.0;
+        // egui_ctx.set_pixels_per_point(2.0);
+
+        let mut egui_input_state = egui_backend::EguiInputState::new(egui::RawInput {
+            screen_rect: Some(Rect::from_min_size(
+                Pos2::new(0f32, 0f32),
+                vec2(width as f32, height as f32) / native_pixels_per_point,
+            )),
+            ..Default::default()
+        });
+
+        egui_input_state.input.time = Some(0.01);
+
+        // let triangle = triangle::Triangle::new();
+        let slider = &mut 0.0;
+
+        // C data
+        let camera_pos = Vec3 {
+            x: 18.9,
+            y: 10.6,
+            z: 11.6,
+        };
+        let camera_front = Vec3 {
+            x: -0.6,
+            y: -0.2,
+            z: -0.7,
+        };
+        let camera = Camera_Create(
+            camera_pos,
+            camera_front,
+            Vec3 {
+                x: 0.0,
+                y: 1.0,
+                z: 0.0,
+            },
+            45.0,
+        );
+        SetCamera(camera);
+
+        let mut cube_geo = Geo_CreateCuboid(f32x3 {
+            x: 2.0,
+            y: 2.0,
+            z: 2.0,
+        });
+        let mut crate_mesh = Mesh_Create(addr_of_mut!(cube_geo), false);
+        let albedo_map = TextureLoadFromFile(
+            CString::new("assets/demo/crate/Wood_Crate_001_basecolor.jpg")
+                .unwrap()
+                .as_ptr() as *const i8,
+        );
+        let roughness_map = TextureLoadFromFile(
+            CString::new("assets/demo/crate/Wood_Crate_001_roughness.jpg")
+                .unwrap()
+                .as_ptr() as *const i8,
+        );
+        let normal_map = TextureLoadFromFile(
+            CString::new("assets/demo/crate/Wood_Crate_001_normal.jpg")
+                .unwrap()
+                .as_ptr() as *const i8,
+        );
+        let ao_map = TextureLoadFromFile(
+            CString::new("assets/demo/crate/Wood_Crate_001_ambientOcclusion.jpg")
+                .unwrap()
+                .as_ptr() as *const i8,
+        );
+        let name: [i8; 64] = [0; 64];
+        let mut crate_mat = Material {
+            name: name,
+            kind: 0,
+            param_albedo: Vec3 {
+                x: 0.0,
+                y: 0.0,
+                z: 0.0,
+            },
+            param_metallic: 0.0,
+            param_roughness: 0.0,
+            param_ao: 0.0,
+            pbr_albedo_map: albedo_map,
+            pbr_normal_map: normal_map,
+            metal_roughness_combined: true,
+            pbr_metallic_map: TextureHandle { raw: 99999 },
+            pbr_roughness_map: roughness_map,
+            pbr_ao_map: ao_map,
+        };
+        let crate_renderent = RenderEnt {
+            mesh: addr_of_mut!(crate_mesh),
+            material: addr_of_mut!(crate_mat),
+            affine: mat4_ident(),
+            casts_shadows: true,
+        };
+        let mut render_ents: [RenderEnt; 1] = [crate_renderent];
+        let mut skybox = Skybox_Default();
+
+        // Main rendering loop
+        while !window.should_close() {
+            glfw.poll_events();
+
+            egui_ctx.begin_frame(egui_input_state.input.take());
+
+            unsafe {
+                gl::ClearColor(0.455, 0.302, 0.663, 1.0);
+                gl::Clear(gl::COLOR_BUFFER_BIT);
+                gl::Clear(gl::DEPTH_TEST);
+            }
+
+            Frame_Begin();
+            gl::Enable(gl::DEPTH_TEST);
+            gl::Enable(gl::CULL_FACE);
+
+            Skybox_Draw(addr_of_mut!(skybox), camera);
+            Render_RenderEntities(render_ents.as_mut_ptr(), render_ents.len());
+
+            // Frame_End();
+
+            // triangle.draw();
+
+            gl::Disable(gl::DEPTH_TEST);
+            gl::Disable(gl::CULL_FACE);
+
+            egui::Window::new("Egui with GLFW").show(&egui_ctx, |ui| {
+                ui.label("Celeritas in-game editor");
+                let btn_m = &mut ui.button("-");
+                let btn_p = &mut ui.button("+");
+
+                ui.add(egui::Slider::new(slider, 0.0..=100.0).text("My value"));
+
+                if btn_m.clicked() && *slider > 0.0 {
+                    *slider -= 1.0;
+                }
+
+                if btn_p.clicked() && *slider < 100.0 {
+                    *slider += 1.0;
+                }
+            });
+
+            let egui::FullOutput {
+                platform_output,
+                textures_delta,
+                shapes,
+                ..
+            } = egui_ctx.end_frame();
+
+            //Handle cut, copy text from egui
+            if !platform_output.copied_text.is_empty() {
+                egui_backend::copy_to_clipboard(&mut egui_input_state, platform_output.copied_text);
+            }
+
+            //Note: passing a bg_color to paint_jobs will clear any previously drawn stuff.
+            //Use this only if egui is being used for all drawing and you aren't mixing your own Open GL
+            //drawing calls with it.
+            //Since we are custom drawing an OpenGL Triangle we don't need egui to clear the background.
+
+            let clipped_shapes = egui_ctx.tessellate(shapes, native_pixels_per_point);
+            painter.paint_and_update_textures(
+                native_pixels_per_point,
+                &clipped_shapes,
+                &textures_delta,
+            );
+
+            for (_, event) in glfw::flush_messages(&events) {
+                match event {
+                    glfw::WindowEvent::Close => window.set_should_close(true),
+                    _ => {
+                        egui_backend::handle_event(event, &mut egui_input_state);
+                    }
+                }
+            }
+
+            window.swap_buffers();
+        }
+    }
+}
diff --git a/bindgen/rust/celeritas-sys/examples/gui_test.rs b/bindgen/rust/celeritas-sys/examples/gui_test.rs
new file mode 100644
index 0000000..ddd8b86
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/examples/gui_test.rs
@@ -0,0 +1,283 @@
+// // #![windows_subsystem = "windows"] // to turn off console.
+
+// use std::ptr;
+// use std::{ffi::CString, ptr::addr_of_mut};
+
+// use celeritas::*;
+// use egui::DragValue;
+// use egui_overlay::{EguiOverlay, OverlayApp};
+// use egui_render_three_d::ThreeDBackend;
+// use egui_window_glfw_passthrough::glfw::Context;
+// use egui_window_glfw_passthrough::{GlfwBackend, GlfwConfig};
+
+// fn main() {
+//     // use tracing_subscriber::{fmt, prelude::*, EnvFilter};
+//     // if RUST_LOG is not set, we will use the following filters
+//     // tracing_subscriber::registry()
+//     //     .with(fmt::layer())
+//     //     .with(
+//     //         EnvFilter::try_from_default_env()
+//     //             .unwrap_or(EnvFilter::new("debug,wgpu=warn,naga=warn")),
+//     //     )
+//     //     .init();
+
+//     unsafe {
+//         // let p: *mut GLFWwindow = ptr::null_mut();
+//         // Core_Bringup(p);
+
+//         // let core = get_global_core();
+//         // let glfw_window_ptr = Core_GetGlfwWindowPtr(core);
+
+//         let mut glfw_backend = GlfwBackend::new(GlfwConfig {
+//             // this closure will be called before creating a window
+//             glfw_callback: Box::new(|gtx| {
+//                 // some defualt hints. it is empty atm, but in future we might add some convenience hints to it.
+//                 (egui_window_glfw_passthrough::GlfwConfig::default().glfw_callback)(gtx);
+//                 // scale the window size based on monitor scale. as 800x600 looks too small on a 4k screen, compared to a hd screen in absolute pixel sizes.
+//                 gtx.window_hint(
+//                     egui_window_glfw_passthrough::glfw::WindowHint::ScaleToMonitor(true),
+//                 );
+//             }),
+//             opengl_window: Some(true), // macos doesn't support opengl.
+//             transparent_window: Some(false),
+//             window_title: "Celeritas egui".into(),
+//             ..Default::default()
+//         });
+
+//         // always on top
+//         // glfw_backend.window.set_floating(true);
+//         // disable borders/titlebar
+//         // glfw_backend.window.set_decorated(false);
+
+//         let latest_size = glfw_backend.window.get_framebuffer_size();
+//         let latest_size = [latest_size.0 as _, latest_size.1 as _];
+
+//         let default_gfx_backend = {
+//             ThreeDBackend::new(
+//                 egui_render_three_d::ThreeDConfig {
+//                     ..Default::default()
+//                 },
+//                 |s| glfw_backend.get_proc_address(s),
+//                 latest_size,
+//             )
+//         };
+
+//         let glfw_window_ptr = glfw_backend.window.window_ptr();
+//         unsafe {
+//             // Cast the window pointer to the expected type
+//             let window_ptr = glfw_window_ptr as *mut crate::GLFWwindow;
+//             Core_Bringup(window_ptr);
+//         };
+
+//         // cam pos: 18.871811 10.658584 11.643305 cam frontL -0.644326 -0.209243 -0.735569
+//         let camera_pos = Vec3 {
+//             x: 18.9,
+//             y: 10.6,
+//             z: 11.6,
+//         };
+//         let camera_front = Vec3 {
+//             x: -0.6,
+//             y: -0.2,
+//             z: -0.7,
+//         };
+//         let camera = Camera_Create(
+//             camera_pos,
+//             camera_front,
+//             Vec3 {
+//                 x: 0.0,
+//                 y: 1.0,
+//                 z: 0.0,
+//             },
+//             45.0,
+//         );
+//         SetCamera(camera);
+
+//         let mut cube_geo = Geo_CreateCuboid(f32x3 {
+//             x: 2.0,
+//             y: 2.0,
+//             z: 2.0,
+//         });
+//         let mut crate_mesh = Mesh_Create(addr_of_mut!(cube_geo), false);
+//         let albedo_map = TextureLoadFromFile(
+//             CString::new("assets/demo/crate/Wood_Crate_001_basecolor.jpg")
+//                 .unwrap()
+//                 .as_ptr() as *const i8,
+//         );
+//         let roughness_map = TextureLoadFromFile(
+//             CString::new("assets/demo/crate/Wood_Crate_001_roughness.jpg")
+//                 .unwrap()
+//                 .as_ptr() as *const i8,
+//         );
+//         let normal_map = TextureLoadFromFile(
+//             CString::new("assets/demo/crate/Wood_Crate_001_normal.jpg")
+//                 .unwrap()
+//                 .as_ptr() as *const i8,
+//         );
+//         let ao_map = TextureLoadFromFile(
+//             CString::new("assets/demo/crate/Wood_Crate_001_ambientOcclusion.jpg")
+//                 .unwrap()
+//                 .as_ptr() as *const i8,
+//         );
+//         let name: [i8; 64] = [0; 64];
+//         let mut crate_mat = Material {
+//             name: name,
+//             kind: 0,
+//             param_albedo: Vec3 {
+//                 x: 0.0,
+//                 y: 0.0,
+//                 z: 0.0,
+//             },
+//             param_metallic: 0.0,
+//             param_roughness: 0.0,
+//             param_ao: 0.0,
+//             pbr_albedo_map: albedo_map,
+//             pbr_normal_map: normal_map,
+//             metal_roughness_combined: true,
+//             pbr_metallic_map: TextureHandle { raw: 99999 },
+//             pbr_roughness_map: roughness_map,
+//             pbr_ao_map: ao_map,
+//         };
+//         let crate_renderent = RenderEnt {
+//             mesh: addr_of_mut!(crate_mesh),
+//             material: addr_of_mut!(crate_mat),
+//             affine: mat4_ident(),
+//             casts_shadows: true,
+//         };
+//         let mut render_ents: [RenderEnt; 1] = [crate_renderent];
+
+//         let world_state = HelloWorld {
+//             frame: 0,
+//             render_entities: render_ents,
+//         };
+
+//         let overlap_app = OverlayApp {
+//             user_data: world_state,
+//             egui_context: Default::default(),
+//             default_gfx_backend,
+//             glfw_backend,
+//         };
+
+//         overlap_app.enter_event_loop();
+
+//         // celeritas::egui_utils::start(HelloWorld { frame: 0});
+//     }
+// }
+
+// pub struct HelloWorld {
+//     pub frame: u64,
+//     pub render_entities: [RenderEnt; 1],
+// }
+// impl EguiOverlay for HelloWorld {
+//     fn gui_run(
+//         &mut self,
+//         egui_context: &egui::Context,
+//         _default_gfx_backend: &mut ThreeDBackend,
+//         glfw_backend: &mut egui_window_glfw_passthrough::GlfwBackend,
+//     ) {
+//         unsafe {
+//             // Frame_Begin();
+//             // Render_RenderEntities(
+//             //     self.render_entities.as_mut_ptr(),
+//             //     self.render_entities.len(),
+//             // );
+//             // Frame_End();
+//         }
+
+//         // just some controls to show how you can use glfw_backend
+//         egui::Window::new("controls").show(egui_context, |ui| {
+//             ui.set_width(300.0);
+//             self.frame += 1;
+//             ui.label(format!("current frame number: {}", self.frame));
+//             // sometimes, you want to see the borders to understand where the overlay is.
+//             let mut borders = glfw_backend.window.is_decorated();
+//             if ui.checkbox(&mut borders, "window borders").changed() {
+//                 glfw_backend.window.set_decorated(borders);
+//             }
+
+//             ui.label(format!(
+//                 "pixels_per_virtual_unit: {}",
+//                 glfw_backend.physical_pixels_per_virtual_unit
+//             ));
+//             ui.label(format!("window scale: {}", glfw_backend.scale));
+//             ui.label(format!("cursor pos x: {}", glfw_backend.cursor_pos[0]));
+//             ui.label(format!("cursor pos y: {}", glfw_backend.cursor_pos[1]));
+
+//             ui.label(format!(
+//                 "passthrough: {}",
+//                 glfw_backend.window.is_mouse_passthrough()
+//             ));
+//             // how to change size.
+//             // WARNING: don't use drag value, because window size changing while dragging ui messes things up.
+//             let mut size = glfw_backend.window_size_logical;
+//             let mut changed = false;
+//             ui.horizontal(|ui| {
+//                 ui.label("width: ");
+//                 ui.add_enabled(false, DragValue::new(&mut size[0]));
+//                 if ui.button("inc").clicked() {
+//                     size[0] += 10.0;
+//                     changed = true;
+//                 }
+//                 if ui.button("dec").clicked() {
+//                     size[0] -= 10.0;
+//                     changed = true;
+//                 }
+//             });
+//             ui.horizontal(|ui| {
+//                 ui.label("height: ");
+//                 ui.add_enabled(false, DragValue::new(&mut size[1]));
+//                 if ui.button("inc").clicked() {
+//                     size[1] += 10.0;
+//                     changed = true;
+//                 }
+//                 if ui.button("dec").clicked() {
+//                     size[1] -= 10.0;
+//                     changed = true;
+//                 }
+//             });
+//             if changed {
+//                 glfw_backend.set_window_size(size);
+//             }
+//             // how to change size.
+//             // WARNING: don't use drag value, because window size changing while dragging ui messes things up.
+//             let mut pos = glfw_backend.window_position;
+//             let mut changed = false;
+//             ui.horizontal(|ui| {
+//                 ui.label("x: ");
+//                 ui.add_enabled(false, DragValue::new(&mut pos[0]));
+//                 if ui.button("inc").clicked() {
+//                     pos[0] += 10;
+//                     changed = true;
+//                 }
+//                 if ui.button("dec").clicked() {
+//                     pos[0] -= 10;
+//                     changed = true;
+//                 }
+//             });
+//             ui.horizontal(|ui| {
+//                 ui.label("y: ");
+//                 ui.add_enabled(false, DragValue::new(&mut pos[1]));
+//                 if ui.button("inc").clicked() {
+//                     pos[1] += 10;
+//                     changed = true;
+//                 }
+//                 if ui.button("dec").clicked() {
+//                     pos[1] -= 10;
+//                     changed = true;
+//                 }
+//             });
+//             if changed {
+//                 glfw_backend.window.set_pos(pos[0], pos[1]);
+//             }
+//         });
+
+//         // here you decide if you want to be passthrough or not.
+//         if egui_context.wants_pointer_input() || egui_context.wants_keyboard_input() {
+//             // we need input, so we need the window to be NOT passthrough
+//             glfw_backend.set_passthrough(false);
+//         } else {
+//             // we don't care about input, so the window can be passthrough now
+//             glfw_backend.set_passthrough(true)
+//         }
+//         egui_context.request_repaint();
+//     }
+// }
diff --git a/bindgen/rust/celeritas-sys/examples/main_loop.rs b/bindgen/rust/celeritas-sys/examples/main_loop.rs
new file mode 100644
index 0000000..65f4137
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/examples/main_loop.rs
@@ -0,0 +1,108 @@
+use std::{
+    ffi::CString,
+    ptr::{self, addr_of_mut},
+};
+
+use celeritas::*;
+
+unsafe fn run_game() {
+    // init
+    let p: *mut GLFWwindow = ptr::null_mut();
+    Core_Bringup(p);
+
+    let core = get_global_core();
+    let glfw_window_ptr = Core_GetGlfwWindowPtr(core);
+
+    // cam pos: 18.871811 10.658584 11.643305 cam frontL -0.644326 -0.209243 -0.735569
+    let camera_pos = Vec3 {
+        x: 18.9,
+        y: 10.6,
+        z: 11.6,
+    };
+    let camera_front = Vec3 {
+        x: -0.6,
+        y: -0.2,
+        z: -0.7,
+    };
+    let camera = Camera_Create(
+        camera_pos,
+        camera_front,
+        Vec3 {
+            x: 0.0,
+            y: 1.0,
+            z: 0.0,
+        },
+        45.0,
+    );
+    SetCamera(camera);
+
+    let mut cube_geo = Geo_CreateCuboid(f32x3 {
+        x: 2.0,
+        y: 2.0,
+        z: 2.0,
+    });
+    let mut crate_mesh = Mesh_Create(addr_of_mut!(cube_geo), false);
+    let albedo_map = TextureLoadFromFile(
+        CString::new("assets/demo/crate/Wood_Crate_001_basecolor.jpg")
+            .unwrap()
+            .as_ptr() as *const i8,
+    );
+    let roughness_map = TextureLoadFromFile(
+        CString::new("assets/demo/crate/Wood_Crate_001_roughness.jpg")
+            .unwrap()
+            .as_ptr() as *const i8,
+    );
+    let normal_map = TextureLoadFromFile(
+        CString::new("assets/demo/crate/Wood_Crate_001_normal.jpg")
+            .unwrap()
+            .as_ptr() as *const i8,
+    );
+    let ao_map = TextureLoadFromFile(
+        CString::new("assets/demo/crate/Wood_Crate_001_ambientOcclusion.jpg")
+            .unwrap()
+            .as_ptr() as *const i8,
+    );
+    let name: [i8; 64] = [0; 64];
+    let mut crate_mat = Material {
+        name: name,
+        kind: 0,
+        param_albedo: Vec3 {
+            x: 0.0,
+            y: 0.0,
+            z: 0.0,
+        },
+        param_metallic: 0.0,
+        param_roughness: 0.0,
+        param_ao: 0.0,
+        pbr_albedo_map: albedo_map,
+        pbr_normal_map: normal_map,
+        metal_roughness_combined: true,
+        pbr_metallic_map: TextureHandle { raw: 99999 },
+        pbr_roughness_map: roughness_map,
+        pbr_ao_map: ao_map,
+    };
+    let crate_renderent = RenderEnt {
+        mesh: addr_of_mut!(crate_mesh),
+        material: addr_of_mut!(crate_mat),
+        affine: mat4_ident(),
+        casts_shadows: true,
+    };
+    let mut render_entities: [RenderEnt; 1] = [crate_renderent];
+
+    // main loop
+    while !ShouldExit() {
+        Frame_Begin();
+
+        Render_RenderEntities(render_entities.as_mut_ptr(), render_entities.len());
+
+        Frame_End();
+    }
+}
+
+fn main() {
+    println!("Running from Rust!");
+
+    unsafe {
+        run_game();
+    }
+}
diff --git a/bindgen/rust/celeritas-sys/src/egui_utils.rs b/bindgen/rust/celeritas-sys/src/egui_utils.rs
new file mode 100644
index 0000000..5432d81
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/src/egui_utils.rs
@@ -0,0 +1,72 @@
+// use egui_overlay::{EguiOverlay, OverlayApp};
+// use egui_render_three_d::ThreeDBackend;
+// use egui_window_glfw_passthrough::glfw::Context;
+// use egui_window_glfw_passthrough::{GlfwBackend, GlfwConfig};
+
+// use crate::Core_Bringup;
+
+// // struct CustomEguiOverlay {
+// //   backend:
+// // }
+
+// fn init() {
+//     let mut glfw_backend = GlfwBackend::new(GlfwConfig::default());
+//     let mut glfw_window_ptr = glfw_backend.window.window_ptr();
+
+//     unsafe {
+//         // Cast the window pointer to the expected type
+//         let window_ptr = glfw_window_ptr as *mut crate::GLFWwindow;
+//         Core_Bringup(window_ptr);
+//     };
+// }
+
+// /// After implementing [`EguiOverlay`], just call this function with your app data
+// pub fn start<T: EguiOverlay + 'static>(user_data: T) {
+//     let mut glfw_backend = GlfwBackend::new(GlfwConfig {
+//         // this closure will be called before creating a window
+//         glfw_callback: Box::new(|gtx| {
+//             // some defualt hints. it is empty atm, but in future we might add some convenience hints to it.
+//             (egui_window_glfw_passthrough::GlfwConfig::default().glfw_callback)(gtx);
+//             // scale the window size based on monitor scale. as 800x600 looks too small on a 4k screen, compared to a hd screen in absolute pixel sizes.
+//             gtx.window_hint(egui_window_glfw_passthrough::glfw::WindowHint::ScaleToMonitor(true));
+//         }),
+//         opengl_window: Some(true), // macos doesn't support opengl.
+//         transparent_window: Some(false),
+//         window_title: "Celeritas egui".into(),
+//         ..Default::default()
+//     });
+
+//     // always on top
+//     // glfw_backend.window.set_floating(true);
+//     // disable borders/titlebar
+//     // glfw_backend.window.set_decorated(false);
+
+//     let latest_size = glfw_backend.window.get_framebuffer_size();
+//     let latest_size = [latest_size.0 as _, latest_size.1 as _];
+
+//     let default_gfx_backend = {
+//         ThreeDBackend::new(
+//             egui_render_three_d::ThreeDConfig {
+//                 ..Default::default()
+//             },
+//             |s| glfw_backend.get_proc_address(s),
+//             latest_size,
+//         )
+//     };
+
+//     let glfw_window_ptr = glfw_backend.window.window_ptr();
+//     unsafe {
+//         // Cast the window pointer to the expected type
+//         let window_ptr = glfw_window_ptr as *mut crate::GLFWwindow;
+//         Core_Bringup(window_ptr);
+//     };
+
+//     let overlap_app = OverlayApp {
+//         user_data,
+//         egui_context: Default::default(),
+//         default_gfx_backend,
+//         glfw_backend,
+//     };
+
+//     overlap_app.enter_event_loop();
+// }
diff --git a/bindgen/rust/celeritas-sys/src/lib.rs b/bindgen/rust/celeritas-sys/src/lib.rs
new file mode 100644
index 0000000..1f64680
--- /dev/null
+++ b/bindgen/rust/celeritas-sys/src/lib.rs
@@ -0,0 +1,7 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+pub mod egui_utils;
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));