moved buffer stuff to a separate module

2021-04-17 14:55:04 +02:00
parent 3ad54777cd
commit 7a1821643c
9 changed files with 188 additions and 189 deletions
@@ -0,0 +1,80 @@
+use crate::renderer::camera::Camera;
+use cgmath::SquareMatrix;
+use wgpu::util::DeviceExt;
+
+#[repr(C)]
+#[derive(Default, Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
+pub struct UniformValues {
+    view_inv: [[f32; 4]; 4],
+    proj_inv: [[f32; 4]; 4],
+    cam_pos: [f32; 3]
+}
+
+impl UniformValues {
+
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn update(&mut self, camera: &Camera) {
+        self.view_inv = camera.view_matrix().invert().unwrap().into();
+        self.proj_inv = camera.proj_matrix().invert().unwrap().into();
+        self.cam_pos = camera.position.into();
+    }
+}
+
+
+pub struct UniformBuffer {
+    pub values: UniformValues,
+    pub buffer: wgpu::Buffer,
+    pub bind_layout: wgpu::BindGroupLayout,
+    pub bind_group: wgpu::BindGroup,
+}
+
+impl UniformBuffer {
+    pub fn new(device: &wgpu::Device) -> Self {
+        // Create values
+        let values = UniformValues::new();
+
+        // Create buffer
+        let buffer = device.create_buffer_init(
+            &wgpu::util::BufferInitDescriptor {
+                label: Some("Uniform buffer"),
+                contents: bytemuck::cast_slice(&[values]),
+                usage: wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
+            }
+        );
+
+        // Create bind group
+        let bind_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            entries: &[
+                wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStage::FRAGMENT,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                }
+            ],
+            label: Some("Uniform buffer layout"),
+        });
+        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout: &bind_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: buffer.as_entire_binding(),
+                }
+            ],
+            label: Some("Uniform buffer group"),
+        });
+
+        // Done
+        UniformBuffer { buffer, values, bind_layout, bind_group }
+    }
+}
+
+