537adcc3f7
# Objective - make lights usable without bevy_render ## Solution - make a new crate for lights to live in ## Testing - 3d_scene, lighting, volumetric_fog, ssr, transmission, pcss, light_textures Note: no breaking changes because of re-exports, except for light textures, which were introduced this cycle so it doesn't matter anyways
582 lines
20 KiB
Rust
582 lines
20 KiB
Rust
use core::num::NonZero;
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use bevy_camera::Camera;
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use bevy_ecs::{entity::EntityHashMap, prelude::*};
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use bevy_light::cluster::{ClusterableObjectCounts, Clusters, GlobalClusterSettings};
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use bevy_math::{uvec4, UVec3, UVec4, Vec4};
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use bevy_render::{
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render_resource::{
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BindingResource, BufferBindingType, ShaderSize, ShaderType, StorageBuffer, UniformBuffer,
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},
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renderer::{RenderAdapter, RenderDevice, RenderQueue},
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sync_world::RenderEntity,
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Extract,
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};
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use tracing::warn;
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use crate::MeshPipeline;
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// NOTE: this must be kept in sync with the same constants in
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// `mesh_view_types.wgsl`.
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pub const MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS: usize = 204;
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// Make sure that the clusterable object buffer doesn't overflow the maximum
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// size of a UBO on WebGL 2.
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const _: () =
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assert!(size_of::<GpuClusterableObject>() * MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS <= 16384);
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// NOTE: Clustered-forward rendering requires 3 storage buffer bindings so check that
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// at least that many are supported using this constant and SupportedBindingType::from_device()
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pub const CLUSTERED_FORWARD_STORAGE_BUFFER_COUNT: u32 = 3;
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// this must match CLUSTER_COUNT_SIZE in pbr.wgsl
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// and must be large enough to contain MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS
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const CLUSTER_COUNT_SIZE: u32 = 9;
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const CLUSTER_OFFSET_MASK: u32 = (1 << (32 - (CLUSTER_COUNT_SIZE * 2))) - 1;
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const CLUSTER_COUNT_MASK: u32 = (1 << CLUSTER_COUNT_SIZE) - 1;
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pub(crate) fn make_global_cluster_settings(world: &World) -> GlobalClusterSettings {
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let device = world.resource::<RenderDevice>();
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let adapter = world.resource::<RenderAdapter>();
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let clustered_decals_are_usable =
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crate::decal::clustered::clustered_decals_are_usable(device, adapter);
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let supports_storage_buffers = matches!(
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device.get_supported_read_only_binding_type(CLUSTERED_FORWARD_STORAGE_BUFFER_COUNT),
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BufferBindingType::Storage { .. }
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);
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GlobalClusterSettings {
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supports_storage_buffers,
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clustered_decals_are_usable,
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max_uniform_buffer_clusterable_objects: MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS,
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view_cluster_bindings_max_indices: ViewClusterBindings::MAX_INDICES,
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}
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}
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#[derive(Copy, Clone, ShaderType, Default, Debug)]
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pub struct GpuClusterableObject {
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// For point lights: the lower-right 2x2 values of the projection matrix [2][2] [2][3] [3][2] [3][3]
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// For spot lights: 2 components of the direction (x,z), spot_scale and spot_offset
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pub(crate) light_custom_data: Vec4,
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pub(crate) color_inverse_square_range: Vec4,
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pub(crate) position_radius: Vec4,
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pub(crate) flags: u32,
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pub(crate) shadow_depth_bias: f32,
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pub(crate) shadow_normal_bias: f32,
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pub(crate) spot_light_tan_angle: f32,
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pub(crate) soft_shadow_size: f32,
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pub(crate) shadow_map_near_z: f32,
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pub(crate) decal_index: u32,
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pub(crate) pad: f32,
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}
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#[derive(Resource)]
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pub struct GlobalClusterableObjectMeta {
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pub gpu_clusterable_objects: GpuClusterableObjects,
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pub entity_to_index: EntityHashMap<usize>,
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}
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pub enum GpuClusterableObjects {
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Uniform(UniformBuffer<GpuClusterableObjectsUniform>),
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Storage(StorageBuffer<GpuClusterableObjectsStorage>),
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}
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#[derive(ShaderType)]
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pub struct GpuClusterableObjectsUniform {
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data: Box<[GpuClusterableObject; MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS]>,
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}
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#[derive(ShaderType, Default)]
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pub struct GpuClusterableObjectsStorage {
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#[size(runtime)]
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data: Vec<GpuClusterableObject>,
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}
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#[derive(Component)]
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pub struct ExtractedClusterConfig {
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/// Special near value for cluster calculations
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pub(crate) near: f32,
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pub(crate) far: f32,
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/// Number of clusters in `X` / `Y` / `Z` in the view frustum
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pub(crate) dimensions: UVec3,
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}
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enum ExtractedClusterableObjectElement {
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ClusterHeader(ClusterableObjectCounts),
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ClusterableObjectEntity(Entity),
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}
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#[derive(Component)]
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pub struct ExtractedClusterableObjects {
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data: Vec<ExtractedClusterableObjectElement>,
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}
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#[derive(ShaderType)]
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struct GpuClusterOffsetsAndCountsUniform {
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data: Box<[UVec4; ViewClusterBindings::MAX_UNIFORM_ITEMS]>,
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}
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#[derive(ShaderType, Default)]
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struct GpuClusterableObjectIndexListsStorage {
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#[size(runtime)]
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data: Vec<u32>,
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}
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#[derive(ShaderType, Default)]
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struct GpuClusterOffsetsAndCountsStorage {
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/// The starting offset, followed by the number of point lights, spot
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/// lights, reflection probes, and irradiance volumes in each cluster, in
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/// that order. The remaining fields are filled with zeroes.
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#[size(runtime)]
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data: Vec<[UVec4; 2]>,
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}
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enum ViewClusterBuffers {
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Uniform {
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// NOTE: UVec4 is because all arrays in Std140 layout have 16-byte alignment
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clusterable_object_index_lists: UniformBuffer<GpuClusterableObjectIndexListsUniform>,
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// NOTE: UVec4 is because all arrays in Std140 layout have 16-byte alignment
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cluster_offsets_and_counts: UniformBuffer<GpuClusterOffsetsAndCountsUniform>,
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},
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Storage {
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clusterable_object_index_lists: StorageBuffer<GpuClusterableObjectIndexListsStorage>,
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cluster_offsets_and_counts: StorageBuffer<GpuClusterOffsetsAndCountsStorage>,
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},
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}
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#[derive(Component)]
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pub struct ViewClusterBindings {
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n_indices: usize,
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n_offsets: usize,
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buffers: ViewClusterBuffers,
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}
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impl FromWorld for GlobalClusterableObjectMeta {
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fn from_world(world: &mut World) -> Self {
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Self::new(
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world
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.resource::<RenderDevice>()
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.get_supported_read_only_binding_type(CLUSTERED_FORWARD_STORAGE_BUFFER_COUNT),
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)
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}
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}
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impl GlobalClusterableObjectMeta {
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pub fn new(buffer_binding_type: BufferBindingType) -> Self {
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Self {
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gpu_clusterable_objects: GpuClusterableObjects::new(buffer_binding_type),
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entity_to_index: EntityHashMap::default(),
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}
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}
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}
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impl GpuClusterableObjects {
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fn new(buffer_binding_type: BufferBindingType) -> Self {
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match buffer_binding_type {
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BufferBindingType::Storage { .. } => Self::storage(),
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BufferBindingType::Uniform => Self::uniform(),
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}
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}
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fn uniform() -> Self {
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Self::Uniform(UniformBuffer::default())
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}
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fn storage() -> Self {
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Self::Storage(StorageBuffer::default())
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}
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pub(crate) fn set(&mut self, mut clusterable_objects: Vec<GpuClusterableObject>) {
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match self {
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GpuClusterableObjects::Uniform(buffer) => {
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let len = clusterable_objects
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.len()
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.min(MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS);
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let src = &clusterable_objects[..len];
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let dst = &mut buffer.get_mut().data[..len];
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dst.copy_from_slice(src);
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}
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GpuClusterableObjects::Storage(buffer) => {
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buffer.get_mut().data.clear();
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buffer.get_mut().data.append(&mut clusterable_objects);
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}
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}
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}
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pub(crate) fn write_buffer(
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&mut self,
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render_device: &RenderDevice,
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render_queue: &RenderQueue,
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) {
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match self {
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GpuClusterableObjects::Uniform(buffer) => {
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buffer.write_buffer(render_device, render_queue);
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}
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GpuClusterableObjects::Storage(buffer) => {
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buffer.write_buffer(render_device, render_queue);
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}
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}
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}
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pub fn binding(&self) -> Option<BindingResource> {
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match self {
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GpuClusterableObjects::Uniform(buffer) => buffer.binding(),
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GpuClusterableObjects::Storage(buffer) => buffer.binding(),
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}
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}
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pub fn min_size(buffer_binding_type: BufferBindingType) -> NonZero<u64> {
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match buffer_binding_type {
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BufferBindingType::Storage { .. } => GpuClusterableObjectsStorage::min_size(),
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BufferBindingType::Uniform => GpuClusterableObjectsUniform::min_size(),
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}
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}
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}
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impl Default for GpuClusterableObjectsUniform {
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fn default() -> Self {
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Self {
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data: Box::new(
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[GpuClusterableObject::default(); MAX_UNIFORM_BUFFER_CLUSTERABLE_OBJECTS],
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),
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}
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}
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}
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/// Extracts clusters from the main world from the render world.
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pub fn extract_clusters(
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mut commands: Commands,
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views: Extract<Query<(RenderEntity, &Clusters, &Camera)>>,
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mapper: Extract<Query<RenderEntity>>,
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) {
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for (entity, clusters, camera) in &views {
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let mut entity_commands = commands
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.get_entity(entity)
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.expect("Clusters entity wasn't synced.");
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if !camera.is_active {
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entity_commands.remove::<(ExtractedClusterableObjects, ExtractedClusterConfig)>();
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continue;
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}
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let entity_count: usize = clusters
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.clusterable_objects
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.iter()
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.map(|l| l.entities.len())
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.sum();
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let mut data = Vec::with_capacity(clusters.clusterable_objects.len() + entity_count);
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for cluster_objects in &clusters.clusterable_objects {
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data.push(ExtractedClusterableObjectElement::ClusterHeader(
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cluster_objects.counts,
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));
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for clusterable_entity in &cluster_objects.entities {
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if let Ok(entity) = mapper.get(*clusterable_entity) {
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data.push(ExtractedClusterableObjectElement::ClusterableObjectEntity(
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entity,
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));
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}
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}
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}
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entity_commands.insert((
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ExtractedClusterableObjects { data },
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ExtractedClusterConfig {
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near: clusters.near,
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far: clusters.far,
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dimensions: clusters.dimensions,
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},
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));
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}
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}
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pub fn prepare_clusters(
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mut commands: Commands,
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render_device: Res<RenderDevice>,
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render_queue: Res<RenderQueue>,
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mesh_pipeline: Res<MeshPipeline>,
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global_clusterable_object_meta: Res<GlobalClusterableObjectMeta>,
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views: Query<(Entity, &ExtractedClusterableObjects)>,
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) {
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let render_device = render_device.into_inner();
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let supports_storage_buffers = matches!(
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mesh_pipeline.clustered_forward_buffer_binding_type,
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BufferBindingType::Storage { .. }
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);
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for (entity, extracted_clusters) in &views {
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let mut view_clusters_bindings =
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ViewClusterBindings::new(mesh_pipeline.clustered_forward_buffer_binding_type);
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view_clusters_bindings.clear();
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for record in &extracted_clusters.data {
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match record {
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ExtractedClusterableObjectElement::ClusterHeader(counts) => {
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let offset = view_clusters_bindings.n_indices();
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view_clusters_bindings.push_offset_and_counts(offset, counts);
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}
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ExtractedClusterableObjectElement::ClusterableObjectEntity(entity) => {
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if let Some(clusterable_object_index) =
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global_clusterable_object_meta.entity_to_index.get(entity)
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{
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if view_clusters_bindings.n_indices() >= ViewClusterBindings::MAX_INDICES
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&& !supports_storage_buffers
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{
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warn!(
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"Clusterable object index lists are full! The clusterable \
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objects in the view are present in too many clusters."
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);
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break;
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}
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view_clusters_bindings.push_index(*clusterable_object_index);
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}
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}
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}
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}
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view_clusters_bindings.write_buffers(render_device, &render_queue);
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commands.entity(entity).insert(view_clusters_bindings);
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}
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}
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impl ViewClusterBindings {
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pub const MAX_OFFSETS: usize = 16384 / 4;
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const MAX_UNIFORM_ITEMS: usize = Self::MAX_OFFSETS / 4;
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pub const MAX_INDICES: usize = 16384;
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pub fn new(buffer_binding_type: BufferBindingType) -> Self {
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Self {
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n_indices: 0,
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n_offsets: 0,
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buffers: ViewClusterBuffers::new(buffer_binding_type),
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}
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}
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pub fn clear(&mut self) {
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match &mut self.buffers {
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ViewClusterBuffers::Uniform {
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clusterable_object_index_lists,
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cluster_offsets_and_counts,
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} => {
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*clusterable_object_index_lists.get_mut().data =
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[UVec4::ZERO; Self::MAX_UNIFORM_ITEMS];
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*cluster_offsets_and_counts.get_mut().data = [UVec4::ZERO; Self::MAX_UNIFORM_ITEMS];
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}
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ViewClusterBuffers::Storage {
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clusterable_object_index_lists,
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cluster_offsets_and_counts,
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..
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} => {
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clusterable_object_index_lists.get_mut().data.clear();
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cluster_offsets_and_counts.get_mut().data.clear();
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}
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}
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}
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fn push_offset_and_counts(&mut self, offset: usize, counts: &ClusterableObjectCounts) {
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match &mut self.buffers {
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ViewClusterBuffers::Uniform {
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cluster_offsets_and_counts,
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..
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} => {
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let array_index = self.n_offsets >> 2; // >> 2 is equivalent to / 4
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if array_index >= Self::MAX_UNIFORM_ITEMS {
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warn!("cluster offset and count out of bounds!");
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return;
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}
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let component = self.n_offsets & ((1 << 2) - 1);
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let packed =
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pack_offset_and_counts(offset, counts.point_lights, counts.spot_lights);
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cluster_offsets_and_counts.get_mut().data[array_index][component] = packed;
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}
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ViewClusterBuffers::Storage {
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cluster_offsets_and_counts,
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..
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} => {
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cluster_offsets_and_counts.get_mut().data.push([
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uvec4(
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offset as u32,
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counts.point_lights,
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counts.spot_lights,
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counts.reflection_probes,
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),
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uvec4(counts.irradiance_volumes, counts.decals, 0, 0),
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]);
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}
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}
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self.n_offsets += 1;
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}
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pub fn n_indices(&self) -> usize {
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self.n_indices
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}
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pub fn push_index(&mut self, index: usize) {
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match &mut self.buffers {
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ViewClusterBuffers::Uniform {
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clusterable_object_index_lists,
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..
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} => {
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let array_index = self.n_indices >> 4; // >> 4 is equivalent to / 16
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let component = (self.n_indices >> 2) & ((1 << 2) - 1);
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let sub_index = self.n_indices & ((1 << 2) - 1);
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let index = index as u32;
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clusterable_object_index_lists.get_mut().data[array_index][component] |=
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index << (8 * sub_index);
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}
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ViewClusterBuffers::Storage {
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clusterable_object_index_lists,
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..
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} => {
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clusterable_object_index_lists
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.get_mut()
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.data
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.push(index as u32);
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}
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}
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self.n_indices += 1;
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}
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pub fn write_buffers(&mut self, render_device: &RenderDevice, render_queue: &RenderQueue) {
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match &mut self.buffers {
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ViewClusterBuffers::Uniform {
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clusterable_object_index_lists,
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cluster_offsets_and_counts,
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} => {
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clusterable_object_index_lists.write_buffer(render_device, render_queue);
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cluster_offsets_and_counts.write_buffer(render_device, render_queue);
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}
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ViewClusterBuffers::Storage {
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clusterable_object_index_lists,
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cluster_offsets_and_counts,
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} => {
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clusterable_object_index_lists.write_buffer(render_device, render_queue);
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cluster_offsets_and_counts.write_buffer(render_device, render_queue);
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}
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}
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}
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pub fn clusterable_object_index_lists_binding(&self) -> Option<BindingResource> {
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match &self.buffers {
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ViewClusterBuffers::Uniform {
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clusterable_object_index_lists,
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..
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} => clusterable_object_index_lists.binding(),
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ViewClusterBuffers::Storage {
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clusterable_object_index_lists,
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..
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} => clusterable_object_index_lists.binding(),
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}
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}
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pub fn offsets_and_counts_binding(&self) -> Option<BindingResource> {
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match &self.buffers {
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ViewClusterBuffers::Uniform {
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cluster_offsets_and_counts,
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..
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} => cluster_offsets_and_counts.binding(),
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ViewClusterBuffers::Storage {
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cluster_offsets_and_counts,
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..
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} => cluster_offsets_and_counts.binding(),
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}
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}
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|
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pub fn min_size_clusterable_object_index_lists(
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buffer_binding_type: BufferBindingType,
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) -> NonZero<u64> {
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match buffer_binding_type {
|
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BufferBindingType::Storage { .. } => GpuClusterableObjectIndexListsStorage::min_size(),
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BufferBindingType::Uniform => GpuClusterableObjectIndexListsUniform::min_size(),
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}
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}
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|
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pub fn min_size_cluster_offsets_and_counts(
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buffer_binding_type: BufferBindingType,
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) -> NonZero<u64> {
|
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match buffer_binding_type {
|
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BufferBindingType::Storage { .. } => GpuClusterOffsetsAndCountsStorage::min_size(),
|
|
BufferBindingType::Uniform => GpuClusterOffsetsAndCountsUniform::min_size(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ViewClusterBuffers {
|
|
fn new(buffer_binding_type: BufferBindingType) -> Self {
|
|
match buffer_binding_type {
|
|
BufferBindingType::Storage { .. } => Self::storage(),
|
|
BufferBindingType::Uniform => Self::uniform(),
|
|
}
|
|
}
|
|
|
|
fn uniform() -> Self {
|
|
ViewClusterBuffers::Uniform {
|
|
clusterable_object_index_lists: UniformBuffer::default(),
|
|
cluster_offsets_and_counts: UniformBuffer::default(),
|
|
}
|
|
}
|
|
|
|
fn storage() -> Self {
|
|
ViewClusterBuffers::Storage {
|
|
clusterable_object_index_lists: StorageBuffer::default(),
|
|
cluster_offsets_and_counts: StorageBuffer::default(),
|
|
}
|
|
}
|
|
}
|
|
|
|
// Compresses the offset and counts of point and spot lights so that they fit in
|
|
// a UBO.
|
|
//
|
|
// This function is only used if storage buffers are unavailable on this
|
|
// platform: typically, on WebGL 2.
|
|
//
|
|
// NOTE: With uniform buffer max binding size as 16384 bytes
|
|
// that means we can fit 204 clusterable objects in one uniform
|
|
// buffer, which means the count can be at most 204 so it
|
|
// needs 9 bits.
|
|
// The array of indices can also use u8 and that means the
|
|
// offset in to the array of indices needs to be able to address
|
|
// 16384 values. log2(16384) = 14 bits.
|
|
// We use 32 bits to store the offset and counts so
|
|
// we pack the offset into the upper 14 bits of a u32,
|
|
// the point light count into bits 9-17, and the spot light count into bits 0-8.
|
|
// [ 31 .. 18 | 17 .. 9 | 8 .. 0 ]
|
|
// [ offset | point light count | spot light count ]
|
|
//
|
|
// NOTE: This assumes CPU and GPU endianness are the same which is true
|
|
// for all common and tested x86/ARM CPUs and AMD/NVIDIA/Intel/Apple/etc GPUs
|
|
//
|
|
// NOTE: On platforms that use this function, we don't cluster light probes, so
|
|
// the number of light probes is irrelevant.
|
|
fn pack_offset_and_counts(offset: usize, point_count: u32, spot_count: u32) -> u32 {
|
|
((offset as u32 & CLUSTER_OFFSET_MASK) << (CLUSTER_COUNT_SIZE * 2))
|
|
| ((point_count & CLUSTER_COUNT_MASK) << CLUSTER_COUNT_SIZE)
|
|
| (spot_count & CLUSTER_COUNT_MASK)
|
|
}
|
|
|
|
#[derive(ShaderType)]
|
|
struct GpuClusterableObjectIndexListsUniform {
|
|
data: Box<[UVec4; ViewClusterBindings::MAX_UNIFORM_ITEMS]>,
|
|
}
|
|
|
|
// NOTE: Assert at compile time that GpuClusterableObjectIndexListsUniform
|
|
// fits within the maximum uniform buffer binding size
|
|
const _: () = assert!(GpuClusterableObjectIndexListsUniform::SHADER_SIZE.get() <= 16384);
|
|
|
|
impl Default for GpuClusterableObjectIndexListsUniform {
|
|
fn default() -> Self {
|
|
Self {
|
|
data: Box::new([UVec4::ZERO; ViewClusterBindings::MAX_UNIFORM_ITEMS]),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Default for GpuClusterOffsetsAndCountsUniform {
|
|
fn default() -> Self {
|
|
Self {
|
|
data: Box::new([UVec4::ZERO; ViewClusterBindings::MAX_UNIFORM_ITEMS]),
|
|
}
|
|
}
|
|
}
|