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use crate::{
wgpu_buffer_types,
wgpu_resources::{
BindGroupDesc, BindGroupEntry, BindGroupLayoutDesc, GpuBindGroup, GpuBindGroupLayoutHandle,
GpuSamplerHandle, SamplerDesc, WgpuResourcePools,
},
};
use bytemuck::{Pod, Zeroable};
use smallvec::smallvec;
/// Mirrors the GPU contents of a frame-global uniform buffer.
///
/// Contains information that is constant for a single frame like camera.
/// (does not contain information that is special to a particular renderer)
#[repr(C, align(256))]
#[derive(Clone, Copy, Zeroable, Pod)]
pub struct FrameUniformBuffer {
pub view_from_world: wgpu_buffer_types::Mat4x3,
pub projection_from_view: wgpu_buffer_types::Mat4,
pub projection_from_world: wgpu_buffer_types::Mat4,
/// Camera position in world space.
pub camera_position: glam::Vec3,
/// For perspective: Multiply this with a camera distance to get a measure of how wide a pixel is in world units.
/// For orthographic: This is the world size value, independent of distance.
pub pixel_world_size_from_camera_distance: f32,
/// Camera direction in world space.
/// Same as `-view_from_world.row(2).truncate()`
pub camera_forward: glam::Vec3,
/// How many pixels there are per point.
/// I.e. the UI zoom factor
pub pixels_from_point: f32,
/// (tan(fov_y / 2) * aspect_ratio, tan(fov_y /2)), i.e. half ratio of screen dimension to screen distance in x & y.
/// Both values are set to f32max for orthographic projection
pub tan_half_fov: wgpu_buffer_types::Vec2,
// Size used for all point radii given with Size::AUTO.
pub auto_size_points: f32,
// Size used for all line radii given with Size::AUTO.
pub auto_size_lines: f32,
/// re_renderer defined device tier.
pub device_tier: wgpu_buffer_types::U32RowPadded,
}
pub(crate) struct GlobalBindings {
pub(crate) layout: GpuBindGroupLayoutHandle,
nearest_neighbor_sampler: GpuSamplerHandle,
trilinear_sampler: GpuSamplerHandle,
}
impl GlobalBindings {
pub fn new(pools: &WgpuResourcePools, device: &wgpu::Device) -> Self {
Self {
layout: pools.bind_group_layouts.get_or_create(
device,
&BindGroupLayoutDesc {
label: "GlobalBindings::layout".into(),
// Needs to be kept in sync with `global_bindings.wgsl` / `create_bind_group`
entries: vec![
// The global per-frame uniform buffer.
wgpu::BindGroupLayoutEntry {
binding: 0,
visibility: wgpu::ShaderStages::all(),
ty: wgpu::BindingType::Buffer {
ty: wgpu::BufferBindingType::Uniform,
has_dynamic_offset: false,
min_binding_size: (std::mem::size_of::<FrameUniformBuffer>()
as u64)
.try_into()
.ok(),
},
count: None,
},
// Sampler without any filtering.
wgpu::BindGroupLayoutEntry {
binding: 1,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::NonFiltering),
count: None,
},
// Trilinear sampler.
wgpu::BindGroupLayoutEntry {
binding: 2,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
count: None,
},
],
},
),
nearest_neighbor_sampler: pools.samplers.get_or_create(
device,
&SamplerDesc {
label: "GlobalBindings::nearest_neighbor_sampler".into(),
address_mode_u: wgpu::AddressMode::Repeat,
address_mode_v: wgpu::AddressMode::Repeat,
address_mode_w: wgpu::AddressMode::Repeat,
..Default::default()
},
),
trilinear_sampler: pools.samplers.get_or_create(
device,
&SamplerDesc {
label: "GlobalBindings::trilinear_sampler".into(),
mag_filter: wgpu::FilterMode::Linear,
min_filter: wgpu::FilterMode::Linear,
mipmap_filter: wgpu::FilterMode::Linear,
address_mode_u: wgpu::AddressMode::Repeat,
address_mode_v: wgpu::AddressMode::Repeat,
address_mode_w: wgpu::AddressMode::Repeat,
..Default::default()
},
),
}
}
/// Creates a bind group that follows the global bind group layout.
pub fn create_bind_group(
&self,
pools: &WgpuResourcePools,
device: &wgpu::Device,
frame_uniform_buffer_binding: BindGroupEntry,
) -> GpuBindGroup {
pools.bind_groups.alloc(
device,
pools,
// Needs to be kept in sync with `global_bindings.wgsl` / `self.layout`
&BindGroupDesc {
label: "GlobalBindings::create_bind_group".into(),
entries: smallvec![
frame_uniform_buffer_binding,
BindGroupEntry::Sampler(self.nearest_neighbor_sampler),
BindGroupEntry::Sampler(self.trilinear_sampler),
],
layout: self.layout,
},
)
}
}