3d camera

Source/Main.rs

@@ -1,8 +1,12 @@
 #![allow(non_snake_case)]
 
+#[path = "Camera.rs"]
+mod _Camera;
+use _Camera::*;
+
 #[path = "Texture.rs"]
 mod _Texture;
-use _Texture::Texture;
+use _Texture::*;
 
 use bytemuck::{Pod, Zeroable};
 use image::GenericImageView;
@@ -83,6 +87,11 @@ struct State {
     num_indices: u32,
     diffuse_bind_group: wgpu::BindGroup,
     diffuse_texture: Texture,
+    camera: Camera,
+    camera_uniform: CameraUniform,
+    camera_buffer: wgpu::Buffer,
+    camera_bind_group: wgpu::BindGroup,
+    camera_controller: CameraController,
 }
 
 impl State {
@@ -223,6 +232,57 @@ impl State {
             label: Some("diffuse_bind_group"),
         });
 
+        // Camera
+
+        let camera = Camera {
+            // 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: cgmath::Vector3::unit_y(),
+            aspect: config.width as f32 / config.height as f32,
+            fovy: 45.0,
+            znear: 0.1,
+            zfar: 100.0,
+        };
+
+        let camera_controller = CameraController::new(0.2);
+
+        let mut camera_uniform = CameraUniform::new();
+        camera_uniform.update_view_proj(&camera);
+
+        let camera_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("Camera Buffer"),
+            contents: bytemuck::cast_slice(&[camera_uniform]),
+            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"),
+        });
+
         // Shader
 
         let shader = device.create_shader_module(&wgpu::ShaderModuleDescriptor {
@@ -235,7 +295,7 @@ impl State {
         let render_pipeline_layout =
             device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
                 label: Some("Render Pipeline Layout"),
-                bind_group_layouts: &[&texture_bind_group_layout],
+                bind_group_layouts: &[&texture_bind_group_layout, &camera_bind_group_layout],
                 push_constant_ranges: &[],
             });
 
@@ -306,6 +366,11 @@ impl State {
             num_indices,
             diffuse_bind_group,
             diffuse_texture,
+            camera,
+            camera_uniform,
+            camera_buffer,
+            camera_bind_group,
+            camera_controller,
         }
     }
 
@@ -319,10 +384,18 @@ impl State {
     }
 
     fn input(&mut self, event: &WindowEvent) -> bool {
-        false
+        self.camera_controller.process_events(event)
     }
 
-    fn update(&mut self) {}
+    fn update(&mut self) {
+        self.camera_controller.update_camera(&mut self.camera);
+        self.camera_uniform.update_view_proj(&self.camera);
+        self.queue.write_buffer(
+            &self.camera_buffer,
+            0,
+            bytemuck::cast_slice(&[self.camera_uniform]),
+        );
+    }
 
     fn render(&mut self) -> Result<(), wgpu::SurfaceError> {
         let output = self.surface.get_current_texture()?;
@@ -359,9 +432,13 @@ impl State {
             });
 
             render_pass.set_pipeline(&self.render_pipeline);
+
             render_pass.set_bind_group(0, &self.diffuse_bind_group, &[]);
+            render_pass.set_bind_group(1, &self.camera_bind_group, &[]);
+
             render_pass.set_vertex_buffer(0, self.vertex_buffer.slice(..));
             render_pass.set_index_buffer(self.index_buffer.slice(..), wgpu::IndexFormat::Uint16);
+
             render_pass.draw_indexed(0..self.num_indices, 0, 0..1);
         }