61 lines
2.3 KiB
Rust
61 lines
2.3 KiB
Rust
|
pub struct Instance {
|
||
|
|
pub position: cgmath::Vector3<f32>,
|
||
|
|
pub rotation: cgmath::Quaternion<f32>,
|
||
|
|
}
|
||
|
|
|
||
|
|
#[repr(C)]
|
||
|
|
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
|
||
|
|
pub struct InstanceRaw {
|
||
|
|
pub model: [[f32; 4]; 4],
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Instance {
|
||
|
|
pub fn to_raw(&self) -> InstanceRaw {
|
||
|
|
return InstanceRaw {
|
||
|
|
model: (cgmath::Matrix4::from_translation(self.position)
|
||
|
|
* cgmath::Matrix4::from(self.rotation))
|
||
|
|
.into(),
|
||
|
|
};
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl InstanceRaw {
|
||
|
|
pub fn desc<'a>() -> wgpu::VertexBufferLayout<'a> {
|
||
|
|
use std::mem;
|
||
|
|
wgpu::VertexBufferLayout {
|
||
|
|
array_stride: mem::size_of::<InstanceRaw>() as wgpu::BufferAddress,
|
||
|
|
// We need to switch from using a step mode of Vertex to Instance
|
||
|
|
// This means that our shaders will only change to use the next
|
||
|
|
// instance when the shader starts processing a new instance
|
||
|
|
step_mode: wgpu::VertexStepMode::Instance,
|
||
|
|
attributes: &[
|
||
|
|
wgpu::VertexAttribute {
|
||
|
|
offset: 0,
|
||
|
|
// While our vertex shader only uses locations 0, and 1 now, in later tutorials we'll
|
||
|
|
// be using 2, 3, and 4, for Vertex. We'll start at slot 5 not conflict with them later
|
||
|
|
shader_location: 5,
|
||
|
|
format: wgpu::VertexFormat::Float32x4,
|
||
|
|
},
|
||
|
|
// A mat4 takes up 4 vertex slots as it is technically 4 vec4s. We need to define a slot
|
||
|
|
// for each vec4. We'll have to reassemble the mat4 in
|
||
|
|
// the shader.
|
||
|
|
wgpu::VertexAttribute {
|
||
|
|
offset: mem::size_of::<[f32; 4]>() as wgpu::BufferAddress,
|
||
|
|
shader_location: 6,
|
||
|
|
format: wgpu::VertexFormat::Float32x4,
|
||
|
|
},
|
||
|
|
wgpu::VertexAttribute {
|
||
|
|
offset: mem::size_of::<[f32; 8]>() as wgpu::BufferAddress,
|
||
|
|
shader_location: 7,
|
||
|
|
format: wgpu::VertexFormat::Float32x4,
|
||
|
|
},
|
||
|
|
wgpu::VertexAttribute {
|
||
|
|
offset: mem::size_of::<[f32; 12]>() as wgpu::BufferAddress,
|
||
|
|
shader_location: 8,
|
||
|
|
format: wgpu::VertexFormat::Float32x4,
|
||
|
|
},
|
||
|
|
],
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|