mirror of https://github.com/sotrh/learn-wgpu
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
324 lines
11 KiB
Rust
324 lines
11 KiB
Rust
use std::mem::size_of_val;
|
|
|
|
use crate::{create_render_pipeline, model};
|
|
|
|
#[repr(C)]
|
|
#[derive(Debug, Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
|
|
struct ChunkData {
|
|
chunk_size: [u32; 2],
|
|
chunk_corner: [i32; 2],
|
|
min_max_height: [f32; 2],
|
|
}
|
|
|
|
pub struct Terrain {
|
|
chunks: Vec<Chunk>,
|
|
chunk_size: cgmath::Vector2<u32>,
|
|
min_max_height: cgmath::Vector2<f32>,
|
|
}
|
|
|
|
impl Terrain {
|
|
pub fn new(chunk_size: cgmath::Vector2<u32>, min_max_height: cgmath::Vector2<f32>) -> Self {
|
|
Self {
|
|
chunks: Vec::new(),
|
|
chunk_size,
|
|
min_max_height,
|
|
}
|
|
}
|
|
|
|
pub fn gen_chunk(
|
|
&mut self,
|
|
device: &wgpu::Device,
|
|
queue: &wgpu::Queue,
|
|
pipeline: &impl GenerateChunk,
|
|
position: cgmath::Vector3<f32>,
|
|
) {
|
|
let corner = position.xz().cast().unwrap();
|
|
let mut index = None;
|
|
for (i, chunk) in self.chunks.iter().enumerate() {
|
|
if chunk.corner == corner {
|
|
index = Some(i);
|
|
}
|
|
}
|
|
let existing_chunk = index.map(|index| self.chunks.remove(index));
|
|
self.chunks
|
|
.push(pipeline.gen_chunk(&device, &queue, corner, existing_chunk));
|
|
}
|
|
}
|
|
|
|
pub struct Chunk {
|
|
corner: cgmath::Vector2<i32>,
|
|
mesh: model::Mesh,
|
|
}
|
|
|
|
pub trait GenerateChunk {
|
|
fn gen_chunk(
|
|
&self,
|
|
device: &wgpu::Device,
|
|
queue: &wgpu::Queue,
|
|
corner: cgmath::Vector2<i32>,
|
|
existing_chunk: Option<Chunk>,
|
|
) -> Chunk;
|
|
}
|
|
|
|
pub struct TerrainPipeline {
|
|
chunk_size: cgmath::Vector2<u32>,
|
|
min_max_height: cgmath::Vector2<f32>,
|
|
gen_layout: wgpu::BindGroupLayout,
|
|
gen_pipeline: wgpu::ComputePipeline,
|
|
render_pipeline: wgpu::RenderPipeline,
|
|
}
|
|
|
|
impl TerrainPipeline {
|
|
pub fn new(
|
|
device: &wgpu::Device,
|
|
chunk_size: cgmath::Vector2<u32>,
|
|
min_max_height: cgmath::Vector2<f32>,
|
|
camera_layout: &wgpu::BindGroupLayout,
|
|
light_layout: &wgpu::BindGroupLayout,
|
|
material_layout: &wgpu::BindGroupLayout,
|
|
color_format: wgpu::TextureFormat,
|
|
depth_format: Option<wgpu::TextureFormat>,
|
|
) -> Self {
|
|
let gen_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
|
|
label: Some("ChunkLoader::Layout"),
|
|
entries: &[
|
|
wgpu::BindGroupLayoutEntry {
|
|
binding: 0,
|
|
visibility: wgpu::ShaderStages::COMPUTE,
|
|
ty: wgpu::BindingType::Buffer {
|
|
ty: wgpu::BufferBindingType::Uniform,
|
|
has_dynamic_offset: false,
|
|
min_binding_size: None,
|
|
},
|
|
count: None,
|
|
},
|
|
wgpu::BindGroupLayoutEntry {
|
|
binding: 1,
|
|
visibility: wgpu::ShaderStages::COMPUTE,
|
|
ty: wgpu::BindingType::Buffer {
|
|
ty: wgpu::BufferBindingType::Storage { read_only: false },
|
|
has_dynamic_offset: false,
|
|
min_binding_size: None,
|
|
},
|
|
count: None,
|
|
},
|
|
wgpu::BindGroupLayoutEntry {
|
|
binding: 2,
|
|
visibility: wgpu::ShaderStages::COMPUTE,
|
|
ty: wgpu::BindingType::Buffer {
|
|
ty: wgpu::BufferBindingType::Storage { read_only: false },
|
|
has_dynamic_offset: false,
|
|
min_binding_size: None,
|
|
},
|
|
count: None,
|
|
},
|
|
],
|
|
});
|
|
|
|
let shader = device.create_shader_module(wgpu::include_wgsl!("terrain.wgsl"));
|
|
|
|
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
|
label: Some("TerrainPipeline::Gen::PipelineLayout"),
|
|
bind_group_layouts: &[&gen_layout],
|
|
push_constant_ranges: &[],
|
|
});
|
|
let gen_pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
|
|
label: Some("TerrainPipeline::ComputePipeline"),
|
|
layout: Some(&pipeline_layout),
|
|
module: &shader,
|
|
entry_point: "gen_terrain_compute",
|
|
});
|
|
|
|
let render_pipeline_layout =
|
|
device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
|
label: Some("TerrainPipeline::Render::PipelineLayout"),
|
|
bind_group_layouts: &[camera_layout, light_layout, material_layout],
|
|
push_constant_ranges: &[],
|
|
});
|
|
let render_pipeline = create_render_pipeline(
|
|
device,
|
|
&render_pipeline_layout,
|
|
color_format,
|
|
depth_format,
|
|
&[wgpu::VertexBufferLayout {
|
|
array_stride: 32,
|
|
step_mode: wgpu::VertexStepMode::Vertex,
|
|
attributes: &[
|
|
wgpu::VertexAttribute {
|
|
format: wgpu::VertexFormat::Float32x3,
|
|
offset: 0,
|
|
shader_location: 0,
|
|
},
|
|
wgpu::VertexAttribute {
|
|
format: wgpu::VertexFormat::Float32x3,
|
|
offset: 16,
|
|
shader_location: 1,
|
|
},
|
|
],
|
|
}],
|
|
&shader,
|
|
);
|
|
|
|
Self {
|
|
chunk_size,
|
|
min_max_height,
|
|
gen_layout,
|
|
gen_pipeline,
|
|
render_pipeline,
|
|
}
|
|
}
|
|
|
|
pub fn render<'a, 'b>(
|
|
&'a self,
|
|
render_pass: &'b mut wgpu::RenderPass<'a>,
|
|
terrain: &'a Terrain,
|
|
camera_bind_group: &'a wgpu::BindGroup,
|
|
light_bind_group: &'a wgpu::BindGroup,
|
|
material_bind_group: &'a wgpu::BindGroup,
|
|
) {
|
|
render_pass.set_pipeline(&self.render_pipeline);
|
|
render_pass.set_bind_group(0, camera_bind_group, &[]);
|
|
render_pass.set_bind_group(1, light_bind_group, &[]);
|
|
render_pass.set_bind_group(2, material_bind_group, &[]);
|
|
for chunk in &terrain.chunks {
|
|
render_pass
|
|
.set_index_buffer(chunk.mesh.index_buffer.slice(..), chunk.mesh.index_format);
|
|
render_pass.set_vertex_buffer(0, chunk.mesh.vertex_buffer.slice(..));
|
|
render_pass.draw_indexed(0..chunk.mesh.num_elements, 0, 0..1);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl GenerateChunk for TerrainPipeline {
|
|
fn gen_chunk(
|
|
&self,
|
|
device: &wgpu::Device,
|
|
queue: &wgpu::Queue,
|
|
corner: cgmath::Vector2<i32>,
|
|
existing_chunk: Option<Chunk>,
|
|
) -> Chunk {
|
|
let chunk = if let Some(mut chunk) = existing_chunk {
|
|
chunk.corner = corner;
|
|
chunk
|
|
} else {
|
|
let chunk_name = format!("Chunk {:?}", corner);
|
|
let num_vertices = (self.chunk_size.x + 1) * (self.chunk_size.y + 1);
|
|
let vertex_buffer = device.create_buffer(&wgpu::BufferDescriptor {
|
|
label: Some(&format!("{}: Vertices", chunk_name)),
|
|
size: (num_vertices * 8 * std::mem::size_of::<f32>() as u32) as _,
|
|
usage: wgpu::BufferUsages::STORAGE
|
|
| wgpu::BufferUsages::VERTEX
|
|
| wgpu::BufferUsages::COPY_SRC,
|
|
mapped_at_creation: false,
|
|
});
|
|
let num_elements = self.chunk_size.x * self.chunk_size.y * 6;
|
|
let index_buffer = device.create_buffer(&wgpu::BufferDescriptor {
|
|
label: Some(&format!("{}: Indices", chunk_name)),
|
|
size: (num_elements * std::mem::size_of::<u32>() as u32) as _,
|
|
usage: wgpu::BufferUsages::STORAGE
|
|
| wgpu::BufferUsages::INDEX
|
|
| wgpu::BufferUsages::COPY_SRC,
|
|
mapped_at_creation: false,
|
|
});
|
|
Chunk {
|
|
corner,
|
|
mesh: model::Mesh {
|
|
name: chunk_name,
|
|
vertex_buffer,
|
|
index_buffer,
|
|
num_elements,
|
|
material: 0,
|
|
index_format: wgpu::IndexFormat::Uint32,
|
|
},
|
|
}
|
|
};
|
|
|
|
let data = ChunkData {
|
|
chunk_size: self.chunk_size.into(),
|
|
chunk_corner: corner.into(),
|
|
min_max_height: self.min_max_height.into(),
|
|
};
|
|
let gen_buffer = device.create_buffer(&wgpu::BufferDescriptor {
|
|
label: Some("TerrainPipeline: ChunkData"),
|
|
size: size_of_val(&data) as _,
|
|
usage: wgpu::BufferUsages::UNIFORM
|
|
| wgpu::BufferUsages::COPY_DST,
|
|
mapped_at_creation: false,
|
|
});
|
|
queue.write_buffer(&gen_buffer, 0, bytemuck::bytes_of(&data));
|
|
|
|
let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
|
|
label: Some("TerrainPipeline: BindGroup"),
|
|
layout: &self.gen_layout,
|
|
entries: &[
|
|
wgpu::BindGroupEntry {
|
|
binding: 0,
|
|
resource: gen_buffer.as_entire_binding(),
|
|
},
|
|
wgpu::BindGroupEntry {
|
|
binding: 1,
|
|
resource: chunk.mesh.vertex_buffer.as_entire_binding(),
|
|
},
|
|
wgpu::BindGroupEntry {
|
|
binding: 2,
|
|
resource: chunk.mesh.index_buffer.as_entire_binding(),
|
|
},
|
|
],
|
|
});
|
|
|
|
let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
|
|
label: Some("TerrainPipeline::gen_chunk"),
|
|
});
|
|
|
|
let mut cpass = encoder.begin_compute_pass(&wgpu::ComputePassDescriptor {
|
|
label: Some("TerrainPipeline: ComputePass"),
|
|
timestamp_writes: None,
|
|
});
|
|
cpass.set_pipeline(&self.gen_pipeline);
|
|
cpass.set_bind_group(0, &bind_group, &[]);
|
|
cpass.dispatch_workgroups(
|
|
(((self.chunk_size.x + 1) * (self.chunk_size.y + 1)) as f32 / 64.0).ceil() as _,
|
|
1,
|
|
1,
|
|
);
|
|
drop(cpass);
|
|
|
|
queue.submit(std::iter::once(encoder.finish()));
|
|
device.poll(wgpu::Maintain::Wait);
|
|
|
|
chunk
|
|
}
|
|
}
|
|
|
|
#[repr(C)]
|
|
#[derive(Debug, Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
|
|
struct GenData {
|
|
chunk_size: [u32; 2],
|
|
chunk_corner: [i32; 2],
|
|
min_max_height: [f32; 2],
|
|
texture_size: u32,
|
|
_pad0: u32,
|
|
start_index: u32,
|
|
_pad1: u32,
|
|
}
|
|
|
|
impl GenData {
|
|
pub fn new(
|
|
texture_size: u32,
|
|
start_index: u32,
|
|
chunk_size: cgmath::Vector2<u32>,
|
|
chunk_corner: cgmath::Vector2<i32>,
|
|
min_max_height: cgmath::Vector2<f32>,
|
|
) -> Self {
|
|
Self {
|
|
texture_size,
|
|
_pad0: 0,
|
|
start_index,
|
|
_pad1: 0,
|
|
chunk_size: chunk_size.into(),
|
|
chunk_corner: chunk_corner.into(),
|
|
min_max_height: min_max_height.into(),
|
|
}
|
|
}
|
|
}
|