wip: engine enhancements and fixes

Cargo.lock

@@ -75,9 +75,9 @@ checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
 
 [[package]]
 name = "anyhow"
-version = "1.0.98"
+version = "1.0.99"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
+checksum = "b0674a1ddeecb70197781e945de4b3b8ffb61fa939a5597bcf48503737663100"
 
 [[package]]
 name = "arrayref"
@@ -1258,10 +1258,19 @@ dependencies = [
  "winit",
 ]
 
+[[package]]
+name = "raidillon_ecs"
+version = "0.1.0"
+dependencies = [
+ "glam",
+ "raidillon_assets",
+]
+
 [[package]]
 name = "raidillon_game"
 version = "0.1.0"
 dependencies = [
+ "glam",
  "raidillon_core",
  "raidillon_glium",
  "raidillon_platform",
@@ -1278,6 +1287,7 @@ dependencies = [
  "indexmap",
  "raidillon_assets",
  "raidillon_core",
+ "raidillon_ecs",
  "raidillon_platform",
  "winit",
 ]
@@ -1286,6 +1296,7 @@ dependencies = [
 name = "raidillon_platform"
 version = "0.1.0"
 dependencies = [
+ "glam",
  "raidillon_assets",
  "raidillon_core",
  "winit",

Cargo.toml

@@ -4,5 +4,6 @@ members = [
     "glium_platform",
     "platform",
     "asset",
-    "game"
+    "game",
+    "ecs"
 ]

asset/Cargo.toml

@@ -2,5 +2,3 @@
 name = "raidillon_assets"
 version = "0.1.0"
 edition = "2024"
-
-[dependencies]

asset/src/lib.rs

@@ -1,3 +1,10 @@
 pub mod model_manager;
-
 pub use crate::model_manager::{ModelManager, ModelManagerRef};
+
+pub use crate::model_manager::ModelID;
+#[macro_export]
+macro_rules! include_shader {
+    ($path:expr) => {
+        include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../assets/shaders/", $path))
+    };
+}

asset/src/model_manager.rs

@@ -1,14 +1,17 @@
+use std::any::Any;
 use std::cell::RefCell;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::rc::Rc;
 
 pub type ModelManagerRef = Rc<RefCell<Box<dyn ModelManager>>>;
-
+pub type ModelID = PathBuf;
 
 /// The asset manager trait of Raidillon.
-pub trait ModelManager {
+pub trait ModelManager: Any {
     /// Loads a gltf model to VRAM.
     fn load_gltf(&mut self, path: &Path);
     /// Unloads the loaded model from VRAM.
     fn unload_model(&mut self, path: &Path);
+
+    fn get_model(&self, id: &ModelID) -> Option<&dyn Any>;
 }

assets/shaders/gl_textured.frag

@@ -0,0 +1,34 @@
+#version 330 core
+
+in  vec3 v_normal;
+in  vec2 v_tex;
+in  vec3 v_position;
+
+out vec4 frag_color;
+
+uniform vec3 u_light;
+uniform sampler2D tex;
+uniform vec3 color; // base colour factor (acts as solid colour when no texture)
+
+void main() {
+    // Combine base texture (or constant white) with colour factor supplied by CPU.
+    vec3 base_col = texture(tex, v_tex).rgb * color;
+
+    vec3 ambient_color  = base_col * 0.2;
+    vec3 diffuse_color  = base_col * 0.6;
+    vec3 specular_color = vec3(1.0);
+
+    // u_light is the direction **from the light towards the fragment**.
+    float diffuse = max(dot(normalize(v_normal), normalize(u_light)), 0.0);
+
+    vec3 camera_dir = normalize(-v_position);
+    vec3 half_dir   = normalize(normalize(u_light) + camera_dir);
+    float specular  = pow(max(dot(half_dir, normalize(v_normal)), 0.0), 16.0);
+
+    vec3 result = ambient_color + diffuse * diffuse_color + specular * specular_color;
+
+    // Convert from linear to sRGB for display (approximate γ-correction)
+    result = pow(result, vec3(1.0 / 2.2));
+
+    frag_color = vec4(result, 1.0);
+}

assets/shaders/gl_textured.vert

@@ -0,0 +1,23 @@
+#version 330 core
+
+in vec3 position;
+in vec3 normal;
+in vec2 tex_coords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+uniform vec2 uv_offset;
+uniform vec2 uv_scale;
+
+out vec3 v_normal;
+out vec2 v_tex;
+out vec3 v_position;
+
+void main() {
+    mat4 modelview = view * model;
+    v_normal   = transpose(inverse(mat3(modelview))) * normal;
+    v_tex      = tex_coords * uv_scale + uv_offset;
+    v_position = (modelview * vec4(position, 1.0)).xyz;
+    gl_Position = projection * modelview * vec4(position, 1.0);
+}

assets/shaders/skybox.frag

@@ -0,0 +1,22 @@
+#version 330 core
+
+in vec3 direction;
+
+out vec4 frag_color;
+
+uniform sampler2D equirect;
+
+const vec2 inv_atan = vec2(0.15915494309, 0.31830988618);
+
+vec2 sample_spherical_map(vec3 v) {
+    vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
+    uv *= inv_atan;
+    uv += 0.5;
+    return uv;
+}
+
+void main() {
+    vec2 uv = sample_spherical_map(normalize(direction));
+    vec3 color = texture(equirect, uv).rgb;
+    frag_color = vec4(color, 1.0);
+}

assets/shaders/skybox.vert

@@ -0,0 +1,15 @@
+#version 330 core
+
+in vec3 position;
+
+uniform mat4 view;
+
+uniform mat4 projection;
+
+out vec3 direction;
+
+void main() {
+    direction = position;
+    vec4 pos = projection * view * vec4(position, 1.0);
+    gl_Position = pos.xyww;
+}

core/src/scene.rs

@@ -2,9 +2,9 @@ use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 
 pub struct Scene {
-    title: String,
+    pub title: String,
-    world: hecs::World,
+    pub world: hecs::World,
-    skybox_texture_path: Option<PathBuf>,
+    pub skybox_texture_path: Option<PathBuf>,
 }
 
 impl Scene {

core/src/system.rs

@@ -16,7 +16,7 @@ pub trait System {
     fn update(&mut self, ctx: &mut SystemContext);
 }
 
-pub type SystemID = String;
+pub type SystemID = &'static str;
 pub struct SystemManager {
     pub systems: IndexMap<SystemID, Box<dyn System>>,
 }

ecs/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "raidillon_ecs"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+glam = "0.30.5"
+raidillon_assets = { path = "../asset" }

ecs/src/components.rs

@@ -0,0 +1,15 @@
+use glam::{Vec3, Quat, Mat4};
+pub use raidillon_assets::ModelID;
+
+#[derive(Copy, Clone)]
+pub struct Transform {
+    pub translation: Vec3,
+    pub rotation:    Quat,
+    pub scale:       Vec3,
+}
+
+impl Transform {
+    pub fn matrix(&self) -> Mat4 {
+        Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.translation)
+    }
+}

ecs/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod components;
+
+pub use components::{Transform, ModelID};

game/Cargo.toml

@@ -11,3 +11,4 @@ glium = ["raidillon_glium"]
 raidillon_core = { path = "../core" }
 raidillon_platform = { path = "../platform" }
 raidillon_glium = { path = "../glium_platform", optional = true }
+glam = "0.30.5"

game/src/main.rs

@@ -1,14 +1,39 @@
-use raidillon_core::{Engine, Scene};
+use glam::Vec3;
-use raidillon_platform::Platform;
+use raidillon_core::{Engine, Scene, System};
+use raidillon_core::system::SystemContext;
+use raidillon_platform::{Platform, Camera};
 
 #[cfg(feature = "glium")]
 use raidillon_glium::GliumPlatform;
 
+const RENDERING_TEST_SYSTEM: &str = "rendering_test_system";
+struct RenderingTestSystem;
+
+impl System for RenderingTestSystem {
+    fn initialize(&mut self) {}
+    fn load_world(&mut self, ctx: &mut SystemContext) {
+        ctx.scene.world.spawn((Camera {
+            eye:    Vec3::new(0.0, 0.0, 2.0),
+            center: Vec3::ZERO,
+            up:     Vec3::Y,
+            fovy:   60_f32.to_radians(),
+            aspect: 1920 as f32 / 1080 as f32, // FIXME
+            znear:  0.1,
+            zfar:   100.0,
+        },));
+
+        // TODO: Load a sample glTF file
+    }
+
+    fn update(&mut self, ctx: &mut SystemContext) {}
+}
+
 fn main() {
     let mut engine = Engine::new();
     // Define systems
     // engine.system_manager.add_system("spawn_chunks".to_string(), ChunkSystem);
     // engine.system_manager.add_system("movement".to_string(), MovementSystem);
+    engine.system_manager.add_system(RENDERING_TEST_SYSTEM, Box::new(RenderingTestSystem));
 
     // Set up the scene
     let main_scene_id = "Main".to_owned();

glium_platform/Cargo.toml

@@ -11,5 +11,6 @@ gltf = { version = "1.4.1", features = ["import", "utils", "KHR_texture_transfor
 raidillon_platform = { path = "../platform" }
 raidillon_core = { path = "../core" }
 raidillon_assets = { path = "../asset" }
+raidillon_ecs = { path = "../ecs" }
 winit = "0.30.12"
 indexmap = "2.10.0"

glium_platform/src/assets.rs

@@ -1,3 +1,5 @@
+use std::any::Any;
+use std::cell::RefCell;
 use raidillon_assets::{ModelManagerRef, ModelManager};
 use crate::model::Model;
 use std::path::{Path, PathBuf};
@@ -5,10 +7,12 @@ use crate::gltf_loader::load_gltf;
 use glium::backend::Facade;
 use std::collections::HashMap;
 use std::collections::hash_map::Entry;
+use std::rc::Rc;
+use raidillon_assets::model_manager::ModelID;
 
 /// Glium platform asset manager implementation.
 pub struct GliumAssetManager {
-    models: HashMap<PathBuf, Model>,
+    pub models: HashMap<PathBuf, Model>,
     facade: Box<dyn Facade>,
 }
 
@@ -42,4 +46,8 @@ impl ModelManager for GliumAssetManager {
     //         }
     //     }
     // }
+
+    fn get_model(&self, id: &ModelID) -> Option<&dyn Any> {
+        self.models.get(id).map(|model| model as &dyn Any)
+    }
 }

glium_platform/src/lib.rs

@@ -5,6 +5,6 @@ pub mod gltf_loader;
 pub mod system;
 mod render;
 
-pub use assets::GliumAssetManager;
+pub use assets::{GliumAssetManager};
 pub use platform::GliumPlatform;
 pub use system::RenderingSystem;

glium_platform/src/model.rs

@@ -1,3 +1,4 @@
+use std::any::{Any, TypeId};
 use glium::{IndexBuffer, VertexBuffer, implement_vertex};
 use glium::texture::{SrgbTexture2d, Texture2d};
 use glium::uniforms::SamplerBehavior;

glium_platform/src/platform.rs

@@ -1,5 +1,6 @@
 use std::cell::RefCell;
 use std::rc::Rc;
+use std::str::FromStr;
 use std::sync::{Arc, RwLock};
 use raidillon_platform::Platform;
 use glium::winit::event_loop::EventLoop;
@@ -8,12 +9,14 @@ use glium::backend::glutin::Display;
 use glium::glutin::surface::WindowSurface;
 use glium::backend::glutin::SimpleWindowBuilder;
 use glium::Surface;
-use crate::system::{RenderingSystemManager, RenderingSystem, RenderingContext};
+use crate::system::{RenderingSystemManager, RenderingSystem, RenderingContext, SystemID};
 use winit::event::{Event, WindowEvent};
 use raidillon_assets::{ModelManager, ModelManagerRef};
 use raidillon_core::Engine;
-use crate::GliumAssetManager;
+use crate::{GliumAssetManager};
-use crate::render::BasicRenderingSystem;
+use crate::render::BasicMeshRenderingSystem;
+
+pub const MESH_RENDERER: &str = "mesh_renderer";
 
 pub struct GliumPlatform {
     event_loop: EventLoop<()>,
@@ -36,8 +39,15 @@ impl Platform for GliumPlatform {
             .build(&event_loop);
 
         let asset_manager: ModelManagerRef = Rc::new(RefCell::new(Box::new(GliumAssetManager::new(Box::new(display.clone())))));
-        let rendering_system_manager = RenderingSystemManager::new();
+        let mut rendering_system_manager = RenderingSystemManager::new();
         engine.set_model_manager(asset_manager.clone());
+
+        // Install rendering systems
+        rendering_system_manager.add_system(
+            MESH_RENDERER,
+            Box::new(BasicMeshRenderingSystem::initialize(&display))
+        );
+
         Self {
             event_loop,
             window,
@@ -49,6 +59,7 @@ impl Platform for GliumPlatform {
     }
 
     fn run(mut self) {
+        self.engine.initialize();
         let _ = &self.event_loop.run(move |event, el| {
             match event {
                 Event::WindowEvent { event, .. } => match event {

glium_platform/src/render/basic.rs

@@ -1,11 +1,111 @@
-use crate::RenderingSystem;
+use std::any::Any;
+use glium::{uniform, Display, Program, Surface};
+use glium::glutin::surface::WindowSurface;
+use glium::texture::{RawImage2d, SrgbTexture2d};
+use crate::{GliumAssetManager, RenderingSystem};
 use crate::system::RenderingContext;
+use raidillon_assets::include_shader;
+pub use raidillon_platform::Camera;
+use glam::Vec3;
+use glium::uniforms::{MagnifySamplerFilter, MinifySamplerFilter, SamplerWrapFunction};
+use raidillon_ecs::{Transform, ModelID};
+use crate::model::Model;
 
 /// A basic renderer pipeline step.
-pub struct BasicRenderingSystem;
+pub struct BasicMeshRenderingSystem {
+    program: Program,
+    white_tex: SrgbTexture2d,
+    params: glium::DrawParameters<'static>,
+}
+
+impl RenderingSystem for BasicMeshRenderingSystem {
+    fn initialize(display: &Display<WindowSurface>) -> Self {
+        const VERT_SRC: &str = include_shader!("gl_textured.vert");
+        const FRAG_SRC: &str = include_shader!("gl_textured.frag");
+
+        let program = Program::from_source(display, VERT_SRC, FRAG_SRC, None).unwrap();
+
+        let white_tex = {
+            let data = vec![255u8, 255u8, 255u8, 255u8];
+            let raw  = RawImage2d::from_raw_rgba(data, (1, 1));
+            SrgbTexture2d::new(display, raw).unwrap()
+        };
+
+        let params = glium::DrawParameters {
+            depth: glium::Depth {
+                test: glium::draw_parameters::DepthTest::IfLess,
+                write: true,
+                .. Default::default()
+            },
+            .. Default::default()
+        };
+
+        Self {
+            program, white_tex, params
+        }
+    }
 
-impl RenderingSystem for BasicRenderingSystem {
     fn render(&mut self, ctx: &mut RenderingContext) {
-        todo!()
+        let cam = match ctx.scene.world.query::<&Camera>().iter().next() {
+            Some((_, cam)) => *cam,
+            None => {
+                eprintln!("[renderer] No camera component found. Skipping frame");
+                return;
+            }
+        };
+
+        // Direction from the light source (0,+Y) towards the scene.
+        let light_dir: Vec3 = Vec3::new(0.0, -1.0, 0.0).normalize();
+
+        // let asset_manager = ctx.asset_manager.borrow();
+        // let any_ref: &dyn Any = &**asset_manager;
+        // if let Some(glium_manager) = any_ref.downcast_ref::<GliumAssetManager>() {
+        //     &glium_manager.models;
+        // }
+
+        let asset_manager = ctx.asset_manager.borrow();
+
+        for (_, (tr, mh)) in ctx.scene.world.query::<(&Transform, &ModelID)>().iter() {
+            let model = match asset_manager.get_model(mh) {
+                Some(model) => model,
+                _ => continue,
+            };
+
+            let model = match model.downcast_ref::<Model>() {
+                Some(model) => model,
+                None => continue,
+            };
+
+            let mesh = &model.mesh;
+            let mat = &model.material;
+
+            let tex_ref: &SrgbTexture2d = mat.base_color.as_ref().unwrap_or(&self.white_tex);
+
+            let mut sampler = tex_ref.sampled();
+            sampler = sampler.wrap_function(SamplerWrapFunction::Repeat);
+            sampler = sampler.minify_filter(MinifySamplerFilter::Linear);
+            sampler = sampler.magnify_filter(MagnifySamplerFilter::Linear);
+
+            let c = mat.base_color_factor;
+
+            let uniforms = uniform! {
+                model:      tr.matrix().to_cols_array_2d(),
+                view:       cam.view().to_cols_array_2d(),
+                projection: cam.projection().to_cols_array_2d(),
+                u_light:    [light_dir.x, light_dir.y, light_dir.z],
+                tex:        sampler,
+                color:      [c[0], c[1], c[2]],
+                uv_offset:  [mat.uv_offset.x, mat.uv_offset.y],
+                uv_scale:   [mat.uv_scale.x,  mat.uv_scale.y],
+            };
+
+            ctx.target.draw(
+                &mesh.vbuf,
+                &mesh.ibuf,
+                &self.program,
+                &uniforms,
+                &self.params,
+            ).unwrap();
+        }
     }
 }

glium_platform/src/render/mod.rs

@@ -1,2 +1,2 @@
 mod basic;
-pub use basic::BasicRenderingSystem;
+pub use basic::BasicMeshRenderingSystem;

glium_platform/src/system.rs

@@ -1,8 +1,11 @@
+use std::cell::RefCell;
+use std::rc::Rc;
 use raidillon_core::Scene;
-use glium::Frame;
+use glium::{Display, Frame};
-use crate::GliumAssetManager;
+use glium::glutin::surface::WindowSurface;
 use indexmap::IndexMap;
 use raidillon_assets::ModelManagerRef;
+use crate::GliumAssetManager;
 
 pub struct RenderingContext<'a> {
     pub scene: &'a Scene,
@@ -14,10 +17,10 @@ pub struct RenderingContext<'a> {
 /// This is unrelated to the main System trait in core.
 pub trait RenderingSystem {
     fn render(&mut self, ctx: &mut RenderingContext);
-    fn compile_shaders(&mut self) {}
+    fn initialize(display: &Display<WindowSurface>) -> Self where Self: Sized;
 }
 
-type SystemID = String;
+pub type SystemID = &'static str;
 
 pub struct RenderingSystemManager {
     pub systems: IndexMap<SystemID, Box<dyn RenderingSystem>>,

platform/Cargo.toml

@@ -7,3 +7,4 @@ edition = "2024"
 winit = "0.30.12"
 raidillon_core = { path = "../core" }
 raidillon_assets = { path = "../asset" }
+glam = "0.30.5"

platform/src/camera.rs

@@ -0,0 +1,24 @@
+use glam::{Mat4, Vec3};
+
+#[derive(Copy, Clone)]
+pub struct Camera {
+    pub eye:    Vec3,
+    pub center: Vec3,
+    pub up:     Vec3,
+    pub fovy:   f32,
+    pub aspect: f32,
+    pub znear:  f32,
+    pub zfar:   f32,
+}
+
+impl Camera {
+    pub fn view(&self) -> Mat4 {
+        Mat4::look_at_rh(self.eye, self.center, self.up)
+    }
+    pub fn projection(&self) -> Mat4 {
+        Mat4::perspective_rh(self.fovy, self.aspect, self.znear, self.zfar)
+    }
+    pub fn view_proj(&self) -> Mat4 {
+        self.projection() * self.view()
+    }
+}

platform/src/lib.rs

@@ -1,5 +1,5 @@
 pub mod platform;
-pub mod context;
+mod camera;
 
-pub use context::PlatformContext;
 pub use platform::Platform;
+pub use camera::Camera;