materials, brick and nodes structure, preparing for world generation

src/renderer/buffers/material_buffer.rs

@@ -0,0 +1,74 @@
+use wgpu::util::DeviceExt;
+
+
+#[repr(C)]
+#[derive(Default, Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
+struct Material {
+    pub albedo: [f32; 4],
+}
+
+impl Material {
+    pub fn set_albedo(&mut self, r: f32, g: f32, b:f32)
+    {
+        self.albedo[0] = r;
+        self.albedo[1] = g;
+        self.albedo[2] = b;
+    }
+}
+
+
+pub struct MaterialBuffer {
+    materials: [Material; 256],
+    pub buffer: wgpu::Buffer,
+    pub bind_layout: wgpu::BindGroupLayout,
+    pub bind_group: wgpu::BindGroup
+}
+
+impl MaterialBuffer {
+    
+    pub fn new(device: &wgpu::Device) -> Self {
+        // Create values
+        let mut materials: [Material; 256] = [Default::default(); 256];
+        materials[0].set_albedo(0.41,0.33,0.20);
+        materials[1].set_albedo(0.49,0.74,0.00);
+
+        // Create buffer
+        let buffer = device.create_buffer_init(
+            &wgpu::util::BufferInitDescriptor {
+                label: Some("Materials buffer"),
+                contents: bytemuck::cast_slice(&materials),
+                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("Materials 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("Materials buffer group"),
+        });
+
+        // Done
+        MaterialBuffer { buffer, materials, bind_layout, bind_group }
+    }
+}