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Use vertex_attr_array

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Jan Prudil 2020-07-30 17:10:50 +02:00 committed by GitHub
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18
docs/beginner/tutorial4-buffer/README.md
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@ -123,28 +123,16 @@ For you visually learners, our vertex buffer looks like this.
![A figure of the VertexBufferDescriptor](./vb_desc.png) ![A figure of the VertexBufferDescriptor](./vb_desc.png)
Let's create a static method on `Vertex` that returns this descriptor. Let's create a static method on `Vertex` that returns this descriptor. Thankfully, wgpu provides us with a convenient macro for doing this! `vertex_attr_array!` expands into an array of descriptors with automatically calculated offsets.
```rust ```rust
// main.rs // main.rs
impl Vertex { impl Vertex {
fn desc<'a>() -> wgpu::VertexBufferDescriptor<'a> { fn desc<'a>() -> wgpu::VertexBufferDescriptor<'a> {
use std::mem;
wgpu::VertexBufferDescriptor { wgpu::VertexBufferDescriptor {
stride: mem::size_of::<Vertex>() as wgpu::BufferAddress, stride: std::mem::size_of::<Vertex>() as wgpu::BufferAddress,
step_mode: wgpu::InputStepMode::Vertex, step_mode: wgpu::InputStepMode::Vertex,
attributes: &[ attributes: &wgpu::vertex_attr_array![0 => Float3, 1 => Float3],
wgpu::VertexAttributeDescriptor {
offset: 0,
shader_location: 0,
format: wgpu::VertexFormat::Float3,
},
wgpu::VertexAttributeDescriptor {
offset: mem::size_of::<[f32; 3]>() as wgpu::BufferAddress,
shader_location: 1,
format: wgpu::VertexFormat::Float3,
},
]
} }
} }
} }