use crate::render::wgpu::rendergraph::{PassExecutionContext, PassNode};
use wgpu::util::DeviceExt;
#[repr(C)]
#[derive(Copy, Clone, Debug, bytemuck::Pod, bytemuck::Zeroable)]
struct SsrParams {
projection: [[f32; 4]; 4],
inv_projection: [[f32; 4]; 4],
view: [[f32; 4]; 4],
inv_view: [[f32; 4]; 4],
screen_size: [f32; 2],
max_steps: u32,
thickness: f32,
max_distance: f32,
stride: f32,
fade_start: f32,
fade_end: f32,
intensity: f32,
enabled: f32,
_padding: [f32; 2],
}
pub struct SsrPass {
pipeline: wgpu::RenderPipeline,
bind_group_layout: wgpu::BindGroupLayout,
params_buffer: wgpu::Buffer,
point_sampler: wgpu::Sampler,
linear_sampler: wgpu::Sampler,
cached_bind_group: Option<wgpu::BindGroup>,
}
impl SsrPass {
pub fn new(device: &wgpu::Device) -> Self {
let shader = device.create_shader_module(wgpu::include_wgsl!("../../shaders/ssr.wgsl"));
let params = SsrParams {
projection: [[0.0; 4]; 4],
inv_projection: [[0.0; 4]; 4],
view: [[0.0; 4]; 4],
inv_view: [[0.0; 4]; 4],
screen_size: [1920.0, 1080.0],
max_steps: 64,
thickness: 0.3,
max_distance: 50.0,
stride: 1.0,
fade_start: 0.8,
fade_end: 1.0,
intensity: 1.0,
enabled: 0.0,
_padding: [0.0; 2],
};
let params_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("SSR Params Buffer"),
contents: bytemuck::cast_slice(&[params]),
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
});
let point_sampler = device.create_sampler(&wgpu::SamplerDescriptor {
address_mode_u: wgpu::AddressMode::ClampToEdge,
address_mode_v: wgpu::AddressMode::ClampToEdge,
address_mode_w: wgpu::AddressMode::ClampToEdge,
mag_filter: wgpu::FilterMode::Nearest,
min_filter: wgpu::FilterMode::Nearest,
mipmap_filter: wgpu::MipmapFilterMode::Nearest,
..Default::default()
});
let linear_sampler = device.create_sampler(&wgpu::SamplerDescriptor {
address_mode_u: wgpu::AddressMode::ClampToEdge,
address_mode_v: wgpu::AddressMode::ClampToEdge,
address_mode_w: wgpu::AddressMode::ClampToEdge,
mag_filter: wgpu::FilterMode::Linear,
min_filter: wgpu::FilterMode::Linear,
mipmap_filter: wgpu::MipmapFilterMode::Linear,
..Default::default()
});
let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
label: Some("SSR Bind Group Layout"),
entries: &[
wgpu::BindGroupLayoutEntry {
binding: 0,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Texture {
sample_type: wgpu::TextureSampleType::Depth,
view_dimension: wgpu::TextureViewDimension::D2,
multisampled: false,
},
count: None,
},
wgpu::BindGroupLayoutEntry {
binding: 1,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Texture {
sample_type: wgpu::TextureSampleType::Float { filterable: true },
view_dimension: wgpu::TextureViewDimension::D2,
multisampled: false,
},
count: None,
},
wgpu::BindGroupLayoutEntry {
binding: 2,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Texture {
sample_type: wgpu::TextureSampleType::Float { filterable: true },
view_dimension: wgpu::TextureViewDimension::D2,
multisampled: false,
},
count: None,
},
wgpu::BindGroupLayoutEntry {
binding: 3,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::NonFiltering),
count: None,
},
wgpu::BindGroupLayoutEntry {
binding: 4,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
count: None,
},
wgpu::BindGroupLayoutEntry {
binding: 5,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Buffer {
ty: wgpu::BufferBindingType::Uniform,
has_dynamic_offset: false,
min_binding_size: None,
},
count: None,
},
],
});
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
label: Some("SSR Pipeline Layout"),
bind_group_layouts: &[Some(&bind_group_layout)],
immediate_size: 0,
});
let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
label: Some("SSR Pipeline"),
layout: Some(&pipeline_layout),
vertex: wgpu::VertexState {
module: &shader,
entry_point: Some("vertex_main"),
buffers: &[],
compilation_options: Default::default(),
},
fragment: Some(wgpu::FragmentState {
module: &shader,
entry_point: Some("fragment_main"),
targets: &[Some(wgpu::ColorTargetState {
format: wgpu::TextureFormat::Rgba16Float,
blend: None,
write_mask: wgpu::ColorWrites::ALL,
})],
compilation_options: Default::default(),
}),
primitive: wgpu::PrimitiveState {
topology: wgpu::PrimitiveTopology::TriangleList,
strip_index_format: None,
front_face: wgpu::FrontFace::Ccw,
cull_mode: None,
unclipped_depth: false,
polygon_mode: wgpu::PolygonMode::Fill,
conservative: false,
},
depth_stencil: None,
multisample: wgpu::MultisampleState::default(),
multiview_mask: None,
cache: None,
});
Self {
pipeline,
bind_group_layout,
params_buffer,
point_sampler,
linear_sampler,
cached_bind_group: None,
}
}
}
impl PassNode<crate::ecs::world::World> for SsrPass {
fn name(&self) -> &str {
"ssr_pass"
}
fn reads(&self) -> Vec<&str> {
vec!["depth", "view_normals", "scene_color"]
}
fn writes(&self) -> Vec<&str> {
vec!["ssr_raw"]
}
fn invalidate_bind_groups(&mut self) {
self.cached_bind_group = None;
}
fn prepare(
&mut self,
_device: &wgpu::Device,
queue: &wgpu::Queue,
world: &crate::ecs::world::World,
) {
let graphics = &world.resources.graphics;
let enabled = if graphics.ssr_enabled { 1.0 } else { 0.0 };
if let Some(camera_matrices) =
crate::ecs::camera::queries::query_active_camera_matrices(world)
{
let projection: [[f32; 4]; 4] = camera_matrices.projection.into();
let inv_projection: [[f32; 4]; 4] = camera_matrices
.projection
.try_inverse()
.unwrap_or(nalgebra_glm::Mat4::identity())
.into();
let view: [[f32; 4]; 4] = camera_matrices.view.into();
let inv_view: [[f32; 4]; 4] = camera_matrices
.view
.try_inverse()
.unwrap_or(nalgebra_glm::Mat4::identity())
.into();
let (screen_width, screen_height) = world
.resources
.window
.cached_viewport_size
.unwrap_or((1920, 1080));
let params = SsrParams {
projection,
inv_projection,
view,
inv_view,
screen_size: [screen_width as f32, screen_height as f32],
max_steps: graphics.ssr_max_steps,
thickness: graphics.ssr_thickness,
max_distance: graphics.ssr_max_distance,
stride: graphics.ssr_stride,
fade_start: graphics.ssr_fade_start,
fade_end: graphics.ssr_fade_end,
intensity: graphics.ssr_intensity,
enabled,
_padding: [0.0; 2],
};
queue.write_buffer(&self.params_buffer, 0, bytemuck::cast_slice(&[params]));
}
}
fn execute<'r, 'e>(
&mut self,
context: PassExecutionContext<'r, 'e, crate::ecs::world::World>,
) -> crate::render::wgpu::rendergraph::Result<
Vec<crate::render::wgpu::rendergraph::SubGraphRunCommand<'r>>,
> {
if !context.is_pass_enabled() {
return Ok(context.into_sub_graph_commands());
}
if self.cached_bind_group.is_none() {
let (depth_view, _, _) = context.get_depth_attachment("depth")?;
let normal_view = context.get_texture_view("view_normals")?;
let scene_color_view = context.get_texture_view("scene_color")?;
self.cached_bind_group = Some(context.device.create_bind_group(
&wgpu::BindGroupDescriptor {
layout: &self.bind_group_layout,
entries: &[
wgpu::BindGroupEntry {
binding: 0,
resource: wgpu::BindingResource::TextureView(depth_view),
},
wgpu::BindGroupEntry {
binding: 1,
resource: wgpu::BindingResource::TextureView(normal_view),
},
wgpu::BindGroupEntry {
binding: 2,
resource: wgpu::BindingResource::TextureView(scene_color_view),
},
wgpu::BindGroupEntry {
binding: 3,
resource: wgpu::BindingResource::Sampler(&self.point_sampler),
},
wgpu::BindGroupEntry {
binding: 4,
resource: wgpu::BindingResource::Sampler(&self.linear_sampler),
},
wgpu::BindGroupEntry {
binding: 5,
resource: self.params_buffer.as_entire_binding(),
},
],
label: Some("SSR Bind Group"),
},
));
}
let (output_view, output_load_op, output_store_op) =
context.get_color_attachment("ssr_raw")?;
let mut render_pass = context
.encoder
.begin_render_pass(&wgpu::RenderPassDescriptor {
label: Some("SSR Render Pass"),
color_attachments: &[Some(wgpu::RenderPassColorAttachment {
view: output_view,
resolve_target: None,
ops: wgpu::Operations {
load: output_load_op,
store: output_store_op,
},
depth_slice: None,
})],
depth_stencil_attachment: None,
timestamp_writes: None,
occlusion_query_set: None,
multiview_mask: None,
});
render_pass.set_pipeline(&self.pipeline);
render_pass.set_bind_group(0, self.cached_bind_group.as_ref().unwrap(), &[]);
render_pass.draw(0..3, 0..1);
drop(render_pass);
Ok(context.into_sub_graph_commands())
}
}