add simple 3d camera, rename Model2dComponent to MeshComponent, rename base shader file

res/shader/base.wgsl

@@ -10,16 +10,23 @@ struct VertexOutput {
     @location(0) tex_coords: vec2<f32>,
 }
 
+struct CameraUniform {
+    view_proj: mat4x4<f32>,
+};
+
 @group(1) @binding(0)
 var<uniform> u_model_transform: mat4x4<f32>;
 
+@group(2) @binding(0)
+var<uniform> camera: CameraUniform;
+
 @vertex
 fn vs_main(
     model: VertexInput,
 ) -> VertexOutput {
     var out: VertexOutput;
     out.tex_coords = model.tex_coords;
-    out.clip_position = u_model_transform * vec4<f32>(model.position, 1.0);
+    out.clip_position = camera.view_proj * u_model_transform * vec4<f32>(model.position, 1.0);
     return out;
 }
 

src/ecs/components/camera.rs

@@ -0,0 +1,56 @@
+use winit::dpi::PhysicalSize;
+
+use crate::math::{Angle, OPENGL_TO_WGPU_MATRIX};
+
+pub struct CameraComponent {
+    eye: glam::Vec3,
+    target: glam::Vec3,
+    up: glam::Vec3,
+    aspect_ratio: Option<f32>,
+    fov_y: Angle,
+    znear: f32,
+    zfar: f32,
+}
+
+impl Default for CameraComponent {
+    fn default() -> Self {
+        Self {
+            // position the camera one unit up and 2 units back
+            // +z is out of the screen
+            eye: (0.0, 1.0, 2.0).into(),
+            // have it look at the origin
+            target: (0.0, 0.0, 0.0).into(),
+            // which way is "up"
+            up: (0.0, 1.0, 0.0).into(),
+            aspect_ratio: None,//config.width as f32 / config.height as f32,
+            fov_y: Angle::Degrees(45.0),
+            znear: 0.1,
+            zfar: 100.0,
+        }
+    }
+}
+
+impl CameraComponent {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Set the camera aspect ratio. This should only be used internally.
+    pub(crate) fn set_aspect_ratio(&mut self, size: PhysicalSize<u32>) {
+        self.aspect_ratio = Some(size.width as f32 / size.height as f32);
+    }
+
+    /// Check if the camera is ready to be used in rendering.
+    pub fn is_ready(&self) -> bool {
+        self.aspect_ratio.is_some()
+    }
+
+    pub fn get_view_projection_matrix(&self) -> glam::Mat4 {
+        let aspect_ratio  = self.aspect_ratio.expect("ERROR: Camera aspect ratio was not set!");
+
+        let view = glam::Mat4::look_at_rh(self.eye, self.target, self.up);
+        let projection = glam::Mat4::perspective_rh_gl(self.fov_y.to_radians(), aspect_ratio, self.znear, self.zfar);
+
+        OPENGL_TO_WGPU_MATRIX * projection * view
+    }
+}

src/ecs/components/mesh.rs

@@ -3,12 +3,12 @@ use specs::{Component, DenseVecStorage};
 use crate::render::{vertex::Vertex, mesh::Mesh, material::Material};
 
 #[derive(Component, Clone)]
-pub struct Model2dComponent {
+pub struct MeshComponent {
     pub mesh: Mesh,
     pub material: Material,
 }
 
-impl Model2dComponent {
+impl MeshComponent {
     pub fn new(mesh: Mesh, material: Material) -> Self {
         Self {
             mesh,

src/ecs/components/mod.rs

@@ -1,2 +1,3 @@
-pub mod model_2d;
-pub mod transform;
+pub mod mesh;
+pub mod transform;
+pub mod camera;

src/game.rs

@@ -12,7 +12,7 @@ use tracing_subscriber::{
 
 use winit::{window::{WindowBuilder, Window}, event::{Event, WindowEvent, KeyboardInput, ElementState, VirtualKeyCode}, event_loop::{EventLoop, ControlFlow}};
 
-use crate::{render::{renderer::{Renderer, BasicRenderer}, render_job::RenderJob}, input_event::InputEvent, ecs::components::{model_2d::Model2dComponent, transform::TransformComponent}};
+use crate::{render::{renderer::{Renderer, BasicRenderer}, render_job::RenderJob}, input_event::InputEvent, ecs::components::{mesh::MeshComponent, transform::TransformComponent}};
 
 struct GameLoop {
     window: Arc<Window>,
@@ -122,15 +122,15 @@ impl GameLoop {
 
                 let mut world = self.world.lock().await;
 
-                for (ent, (transform,)) in world.query_mut::<(&mut TransformComponent,)>() {
+                /* for (ent, (transform,)) in world.query_mut::<(&mut TransformComponent,)>() {
                     transform.transform.translate_vec3(glam::Vec3::new(0.0, 0.001, 0.0));
                 }
 
                 for (ent, (transform,)) in world.query::<(&TransformComponent,)>().iter() {
                     println!("transform pos: {:?}", transform.transform);
-                }
+                } */
 
-                self.renderer.as_mut().prepare(&world).await;
+                self.renderer.as_mut().prepare(&mut world).await;
                 drop(world);
 
                 match self.renderer.as_mut().render().await {

src/main.rs

@@ -5,7 +5,7 @@ mod resources;
 mod ecs;
 mod math;
 
-use ecs::components::model_2d::Model2dComponent;
+use ecs::components::mesh::MeshComponent;
 
 use ecs::components::transform::TransformComponent;
 use game::Game;
@@ -13,6 +13,7 @@ use hecs::World;
 
 use crate::render::material::Material;
 use crate::render::texture::Texture;
+use crate::ecs::components::camera::CameraComponent;
 //use specs::*;
 
 #[derive(Debug, Default)]
@@ -63,11 +64,11 @@ impl Point3d {
 async fn main() {
     let mut world = World::new();
 
-    world.spawn((Point2d::new(10, 10), Point3d::new(50, 50, 50)));
+    //world.spawn((Point2d::new(10, 10), Point3d::new(50, 50, 50)));
 
     let diffuse_bytes = include_bytes!("../res/happy-tree.png");
     let diffuse_texture = Texture::from_bytes(diffuse_bytes).unwrap();
-    world.spawn((Model2dComponent::new(
+    world.spawn((MeshComponent::new(
         render::mesh::Mesh {
             vertices: crate::render::vertex::VERTICES.to_vec(),
             indices: Some(crate::render::vertex::INDICES.to_vec())
@@ -78,9 +79,7 @@ async fn main() {
         TransformComponent::new(),
     ));
 
-    for (id, (point2d,)) in world.query::<(&Point2d,)>().iter() {
-        println!("Entity {} is at 2d position: {:?}", id.id(), point2d);
-    }
+    world.spawn((CameraComponent::new(),));
 
     Game::initialize().await
         .with_world(world)

src/math/mod.rs

@@ -5,4 +5,13 @@ pub mod angle;
 pub use angle::*;
 
 pub mod transform;
-pub use transform::*;
+pub use transform::*;
+
+/// A matrix used to convert an OpenGL matrix to a matrix compatible with Wgpu
+#[rustfmt::skip]
+pub const OPENGL_TO_WGPU_MATRIX: glam::Mat4 = glam::Mat4::from_cols_array(&[
+    1.0, 0.0, 0.0, 0.0,
+    0.0, 1.0, 0.0, 0.0,
+    0.0, 0.0, 0.5, 0.0,
+    0.0, 0.0, 0.5, 1.0,
+]);

src/render/camera.rs

@@ -0,0 +1,21 @@
+use winit::dpi::PhysicalSize;
+
+use crate::{math::{Angle, OPENGL_TO_WGPU_MATRIX}, ecs::components::camera::CameraComponent};
+
+#[repr(C)]
+#[derive(Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
+pub struct Camera {
+    projection: glam::Mat4
+}
+
+impl Camera {
+    pub fn new() -> Self {
+        Self {
+            projection: glam::Mat4::IDENTITY,
+        }
+    }
+
+    pub fn update_view_projection(&mut self, camera: &CameraComponent) {
+        self.projection = camera.get_view_projection_matrix().into();
+    }
+}

src/render/mod.rs

@@ -7,4 +7,5 @@ pub mod render_job;
 pub mod mesh;
 pub mod texture;
 pub mod shader_loader;
-pub mod material;
+pub mod material;
+pub mod camera;

src/render/renderer.rs

@@ -6,25 +6,27 @@ use std::borrow::Cow;
 use async_std::sync::Mutex;
 use async_trait::async_trait;
 
-use tracing::debug;
+use tracing::{debug, warn};
 use wgpu::{BindGroup, BindGroupLayout};
 use wgpu::util::DeviceExt;
 use winit::window::Window;
 
 use hecs::{World, Entity};
 
-use crate::ecs::components::model_2d::Model2dComponent;
+use crate::ecs::components::camera::CameraComponent;
+use crate::ecs::components::mesh::MeshComponent;
 use crate::ecs::components::transform::TransformComponent;
 use crate::math::Transform;
 use crate::resources;
 
+use super::camera::Camera;
 use super::desc_buf_lay::DescVertexBufferLayout;
 use super::texture::RenderTexture;
 use super::{render_pipeline::FullRenderPipeline, vertex::{VERTICES}, render_buffer::BufferStorage, render_job::RenderJob, mesh::Mesh};
 
 #[async_trait]
 pub trait Renderer {
-    async fn prepare(&mut self, main_world: &World);
+    async fn prepare(&mut self, main_world: &mut World);
     async fn render(&mut self) -> Result<(), wgpu::SurfaceError>;
     async fn on_resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>);
 
@@ -56,8 +58,12 @@ pub struct BasicRenderer {
 
     buffer_storage: HashMap<Entity, RenderBufferStorage>, // TODO: clean up left over buffers from deleted entities/components
 
-    transform_bind_group: wgpu::BindGroup,
     transform_buffer: wgpu::Buffer,
+    transform_bind_group: wgpu::BindGroup,
+
+    inuse_camera: Camera,
+    camera_buffer: wgpu::Buffer,
+    camera_bind_group: wgpu::BindGroup,
 }
 
 impl BasicRenderer {
@@ -140,7 +146,7 @@ impl BasicRenderer {
                 label: Some("texture_bind_group_layout"),
             });
 
-        let shader_src = resources::load_string("shader/base_2d.wgsl").await.expect("Failed to load shader!");
+        let shader_src = resources::load_string("shader/base.wgsl").await.expect("Failed to load shader!");
         let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
             label: Some("Shader"),
             source: wgpu::ShaderSource::Wgsl(Cow::Borrowed(&shader_src)),
@@ -181,9 +187,45 @@ impl BasicRenderer {
             label: Some("transform_bind_group"),
         });
 
+        let camera_buffer = device.create_buffer_init(
+            &wgpu::util::BufferInitDescriptor {
+                label: Some("Camera Buffer"),
+                contents: bytemuck::cast_slice(&[Camera::new()]),
+                usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+            }
+        );
+
+        let camera_bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            entries: &[
+                wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::VERTEX,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                }
+            ],
+            label: Some("camera_bind_group_layout"),
+        });
+        
+        let camera_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout: &camera_bind_group_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: camera_buffer.as_entire_binding(),
+                }
+            ],
+            label: Some("camera_bind_group"),
+        });        
+
         let mut pipelines = HashMap::new();
         pipelines.insert(0, Arc::new(FullRenderPipeline::new(&device, &config, &shader, 
-            vec![super::vertex::Vertex::desc(),], vec![&texture_bind_group_layout, &transform_bind_group_layout])));
+            vec![super::vertex::Vertex::desc(),],
+            vec![&texture_bind_group_layout, &transform_bind_group_layout, &camera_bind_group_layout])));
 
         Self {
             window,
@@ -204,10 +246,14 @@ impl BasicRenderer {
 
             transform_buffer,
             transform_bind_group,
+
+            inuse_camera: Camera::new(),
+            camera_buffer,
+            camera_bind_group,
         }
     }
 
-    fn create_model_buffers(&mut self, model_2d: &Model2dComponent) -> RenderBufferStorage {
+    fn create_model_buffers(&mut self, model_2d: &MeshComponent) -> RenderBufferStorage {
         let mesh = &model_2d.mesh;
 
         let vertex_buffer = self.device.create_buffer_init(
@@ -294,8 +340,8 @@ impl BasicRenderer {
 
 #[async_trait]
 impl Renderer for BasicRenderer {
-    async fn prepare(&mut self, main_world: &World) {
-        for (entity, (model, transform)) in main_world.query::<(&Model2dComponent, Option<&TransformComponent>)>().iter() {
+    async fn prepare(&mut self, main_world: &mut World) {
+        for (entity, (model, transform)) in main_world.query::<(&MeshComponent, Option<&TransformComponent>)>().iter() {
             let transform = match transform {
                 Some(transform) => {
                     Some(transform.transform)
@@ -315,10 +361,19 @@ impl Renderer for BasicRenderer {
             if self.buffer_storage.get(&entity).is_none() {
                 let buffers = self.create_model_buffers(model);
                 self.buffer_storage.insert(entity, buffers);
-            } else {
-                
             }
         }
+
+        if let Some((_e, (camera,))) = main_world.query_mut::<(&mut CameraComponent,)>().into_iter().next() {
+            //if !camera.is_ready() {
+                camera.set_aspect_ratio(self.size);
+            //}
+
+            self.inuse_camera.update_view_projection(camera);
+            self.queue.write_buffer(&self.camera_buffer, 0, bytemuck::cast_slice(&[self.inuse_camera]));
+        } else {
+            warn!("Missing camera!");
+        }
     }
 
     fn add_render_pipeline(&mut self, shader_id: u32, pipeline: Arc<FullRenderPipeline>) {
@@ -369,6 +424,9 @@ impl Renderer for BasicRenderer {
                     } else {
                         debug!("//TODO: clear transform uniform if the RenderJob doesn't have a transform.");
                     }
+
+                    // There will always be a camera (hopefully)
+                    render_pass.set_bind_group(2, &self.camera_bind_group, &[]);
         
                     if let Some(indices) = buffers.buffer_indices.as_ref() {
                         let indices_len = indices.count().unwrap(); // index buffers will have count, if not thats a bug