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https://github.com/bevyengine/bevy
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180c94cc13
# Objective Simple docs/comments only PR that just fixes some outdated file references left over from the render rewrite. ## Solution - Change the references to point to the correct files
1804 lines
67 KiB
Rust
1804 lines
67 KiB
Rust
use crate::{
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point_light_order, AmbientLight, Clusters, CubemapVisibleEntities, DirectionalLight,
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DirectionalLightShadowMap, DrawMesh, GlobalVisiblePointLights, MeshPipeline, NotShadowCaster,
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PointLight, PointLightShadowMap, SetMeshBindGroup, SpotLight, VisiblePointLights,
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SHADOW_SHADER_HANDLE,
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};
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use bevy_asset::Handle;
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use bevy_core_pipeline::core_3d::Transparent3d;
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use bevy_ecs::{
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prelude::*,
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system::{lifetimeless::*, SystemParamItem},
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};
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use bevy_math::{Mat4, UVec3, UVec4, Vec2, Vec3, Vec3Swizzles, Vec4, Vec4Swizzles};
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use bevy_render::{
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camera::{Camera, CameraProjection},
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color::Color,
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mesh::{Mesh, MeshVertexBufferLayout},
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render_asset::RenderAssets,
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render_graph::{Node, NodeRunError, RenderGraphContext, SlotInfo, SlotType},
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render_phase::{
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CachedRenderPipelinePhaseItem, DrawFunctionId, DrawFunctions, EntityPhaseItem,
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EntityRenderCommand, PhaseItem, RenderCommandResult, RenderPhase, SetItemPipeline,
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TrackedRenderPass,
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},
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render_resource::*,
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renderer::{RenderContext, RenderDevice, RenderQueue},
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texture::*,
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view::{
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ComputedVisibility, ExtractedView, ViewUniform, ViewUniformOffset, ViewUniforms,
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VisibleEntities,
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},
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Extract,
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};
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use bevy_transform::{components::GlobalTransform, prelude::Transform};
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use bevy_utils::FloatOrd;
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use bevy_utils::{
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tracing::{error, warn},
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HashMap,
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};
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use std::num::{NonZeroU32, NonZeroU64};
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#[derive(Debug, Hash, PartialEq, Eq, Clone, SystemLabel)]
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pub enum RenderLightSystems {
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ExtractClusters,
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ExtractLights,
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PrepareClusters,
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PrepareLights,
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QueueShadows,
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}
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#[derive(Component)]
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pub struct ExtractedPointLight {
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color: Color,
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/// luminous intensity in lumens per steradian
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intensity: f32,
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range: f32,
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radius: f32,
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transform: GlobalTransform,
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shadows_enabled: bool,
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shadow_depth_bias: f32,
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shadow_normal_bias: f32,
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spot_light_angles: Option<(f32, f32)>,
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}
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#[derive(Component)]
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pub struct ExtractedDirectionalLight {
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color: Color,
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illuminance: f32,
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direction: Vec3,
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projection: Mat4,
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shadows_enabled: bool,
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shadow_depth_bias: f32,
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shadow_normal_bias: f32,
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}
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#[derive(Copy, Clone, ShaderType, Default, Debug)]
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pub struct GpuPointLight {
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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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light_custom_data: Vec4,
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color_inverse_square_range: Vec4,
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position_radius: Vec4,
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flags: u32,
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shadow_depth_bias: f32,
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shadow_normal_bias: f32,
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spot_light_tan_angle: f32,
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}
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#[derive(ShaderType)]
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pub struct GpuPointLightsUniform {
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data: Box<[GpuPointLight; MAX_UNIFORM_BUFFER_POINT_LIGHTS]>,
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}
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impl Default for GpuPointLightsUniform {
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fn default() -> Self {
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Self {
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data: Box::new([GpuPointLight::default(); MAX_UNIFORM_BUFFER_POINT_LIGHTS]),
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}
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}
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}
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#[derive(ShaderType, Default)]
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pub struct GpuPointLightsStorage {
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#[size(runtime)]
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data: Vec<GpuPointLight>,
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}
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pub enum GpuPointLights {
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Uniform(UniformBuffer<GpuPointLightsUniform>),
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Storage(StorageBuffer<GpuPointLightsStorage>),
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}
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impl GpuPointLights {
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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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fn set(&mut self, mut lights: Vec<GpuPointLight>) {
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match self {
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GpuPointLights::Uniform(buffer) => {
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let len = lights.len().min(MAX_UNIFORM_BUFFER_POINT_LIGHTS);
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let src = &lights[..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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GpuPointLights::Storage(buffer) => {
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buffer.get_mut().data.clear();
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buffer.get_mut().data.append(&mut lights);
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}
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}
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}
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fn write_buffer(&mut self, render_device: &RenderDevice, render_queue: &RenderQueue) {
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match self {
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GpuPointLights::Uniform(buffer) => buffer.write_buffer(render_device, render_queue),
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GpuPointLights::Storage(buffer) => buffer.write_buffer(render_device, render_queue),
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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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GpuPointLights::Uniform(buffer) => buffer.binding(),
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GpuPointLights::Storage(buffer) => buffer.binding(),
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}
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}
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pub fn min_size(buffer_binding_type: BufferBindingType) -> NonZeroU64 {
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match buffer_binding_type {
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BufferBindingType::Storage { .. } => GpuPointLightsStorage::min_size(),
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BufferBindingType::Uniform => GpuPointLightsUniform::min_size(),
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}
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}
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}
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// NOTE: These must match the bit flags in bevy_pbr/src/render/mesh_view_types.wgsl!
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bitflags::bitflags! {
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#[repr(transparent)]
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struct PointLightFlags: u32 {
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const SHADOWS_ENABLED = (1 << 0);
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const SPOT_LIGHT_Y_NEGATIVE = (1 << 1);
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const NONE = 0;
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const UNINITIALIZED = 0xFFFF;
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}
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}
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#[derive(Copy, Clone, ShaderType, Default, Debug)]
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pub struct GpuDirectionalLight {
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view_projection: Mat4,
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color: Vec4,
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dir_to_light: Vec3,
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flags: u32,
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shadow_depth_bias: f32,
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shadow_normal_bias: f32,
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}
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// NOTE: These must match the bit flags in bevy_pbr/src/render/mesh_view_types.wgsl!
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bitflags::bitflags! {
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#[repr(transparent)]
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struct DirectionalLightFlags: u32 {
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const SHADOWS_ENABLED = (1 << 0);
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const NONE = 0;
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const UNINITIALIZED = 0xFFFF;
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}
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}
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#[derive(Copy, Clone, Debug, ShaderType)]
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pub struct GpuLights {
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directional_lights: [GpuDirectionalLight; MAX_DIRECTIONAL_LIGHTS],
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ambient_color: Vec4,
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// xyz are x/y/z cluster dimensions and w is the number of clusters
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cluster_dimensions: UVec4,
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// xy are vec2<f32>(cluster_dimensions.xy) / vec2<f32>(view.width, view.height)
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// z is cluster_dimensions.z / log(far / near)
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// w is cluster_dimensions.z * log(near) / log(far / near)
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cluster_factors: Vec4,
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n_directional_lights: u32,
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// offset from spot light's light index to spot light's shadow map index
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spot_light_shadowmap_offset: i32,
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}
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// NOTE: this must be kept in sync with the same constants in pbr.frag
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pub const MAX_UNIFORM_BUFFER_POINT_LIGHTS: usize = 256;
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pub const MAX_DIRECTIONAL_LIGHTS: usize = 1;
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pub const SHADOW_FORMAT: TextureFormat = TextureFormat::Depth32Float;
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#[derive(Resource)]
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pub struct ShadowPipeline {
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pub view_layout: BindGroupLayout,
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pub mesh_layout: BindGroupLayout,
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pub skinned_mesh_layout: BindGroupLayout,
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pub point_light_sampler: Sampler,
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pub directional_light_sampler: Sampler,
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}
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// TODO: this pattern for initializing the shaders / pipeline isn't ideal. this should be handled by the asset system
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impl FromWorld for ShadowPipeline {
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fn from_world(world: &mut World) -> Self {
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let render_device = world.resource::<RenderDevice>();
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let view_layout = render_device.create_bind_group_layout(&BindGroupLayoutDescriptor {
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entries: &[
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// View
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BindGroupLayoutEntry {
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binding: 0,
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visibility: ShaderStages::VERTEX | ShaderStages::FRAGMENT,
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ty: BindingType::Buffer {
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ty: BufferBindingType::Uniform,
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has_dynamic_offset: true,
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min_binding_size: Some(ViewUniform::min_size()),
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},
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count: None,
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},
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],
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label: Some("shadow_view_layout"),
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});
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let mesh_pipeline = world.resource::<MeshPipeline>();
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let skinned_mesh_layout = mesh_pipeline.skinned_mesh_layout.clone();
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ShadowPipeline {
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view_layout,
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mesh_layout: mesh_pipeline.mesh_layout.clone(),
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skinned_mesh_layout,
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point_light_sampler: render_device.create_sampler(&SamplerDescriptor {
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address_mode_u: AddressMode::ClampToEdge,
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address_mode_v: AddressMode::ClampToEdge,
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address_mode_w: AddressMode::ClampToEdge,
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mag_filter: FilterMode::Linear,
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min_filter: FilterMode::Linear,
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mipmap_filter: FilterMode::Nearest,
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compare: Some(CompareFunction::GreaterEqual),
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..Default::default()
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}),
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directional_light_sampler: render_device.create_sampler(&SamplerDescriptor {
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address_mode_u: AddressMode::ClampToEdge,
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address_mode_v: AddressMode::ClampToEdge,
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address_mode_w: AddressMode::ClampToEdge,
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mag_filter: FilterMode::Linear,
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min_filter: FilterMode::Linear,
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mipmap_filter: FilterMode::Nearest,
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compare: Some(CompareFunction::GreaterEqual),
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..Default::default()
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}),
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}
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}
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}
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bitflags::bitflags! {
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#[repr(transparent)]
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pub struct ShadowPipelineKey: u32 {
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const NONE = 0;
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const PRIMITIVE_TOPOLOGY_RESERVED_BITS = ShadowPipelineKey::PRIMITIVE_TOPOLOGY_MASK_BITS << ShadowPipelineKey::PRIMITIVE_TOPOLOGY_SHIFT_BITS;
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}
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}
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impl ShadowPipelineKey {
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const PRIMITIVE_TOPOLOGY_MASK_BITS: u32 = 0b111;
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const PRIMITIVE_TOPOLOGY_SHIFT_BITS: u32 = 32 - 3;
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pub fn from_primitive_topology(primitive_topology: PrimitiveTopology) -> Self {
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let primitive_topology_bits = ((primitive_topology as u32)
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& Self::PRIMITIVE_TOPOLOGY_MASK_BITS)
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<< Self::PRIMITIVE_TOPOLOGY_SHIFT_BITS;
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Self::from_bits(primitive_topology_bits).unwrap()
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}
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pub fn primitive_topology(&self) -> PrimitiveTopology {
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let primitive_topology_bits =
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(self.bits >> Self::PRIMITIVE_TOPOLOGY_SHIFT_BITS) & Self::PRIMITIVE_TOPOLOGY_MASK_BITS;
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match primitive_topology_bits {
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x if x == PrimitiveTopology::PointList as u32 => PrimitiveTopology::PointList,
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x if x == PrimitiveTopology::LineList as u32 => PrimitiveTopology::LineList,
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x if x == PrimitiveTopology::LineStrip as u32 => PrimitiveTopology::LineStrip,
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x if x == PrimitiveTopology::TriangleList as u32 => PrimitiveTopology::TriangleList,
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x if x == PrimitiveTopology::TriangleStrip as u32 => PrimitiveTopology::TriangleStrip,
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_ => PrimitiveTopology::default(),
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}
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}
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}
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impl SpecializedMeshPipeline for ShadowPipeline {
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type Key = ShadowPipelineKey;
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fn specialize(
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&self,
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key: Self::Key,
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layout: &MeshVertexBufferLayout,
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) -> Result<RenderPipelineDescriptor, SpecializedMeshPipelineError> {
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let mut vertex_attributes = vec![Mesh::ATTRIBUTE_POSITION.at_shader_location(0)];
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let mut bind_group_layout = vec![self.view_layout.clone()];
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let mut shader_defs = Vec::new();
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if layout.contains(Mesh::ATTRIBUTE_JOINT_INDEX)
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&& layout.contains(Mesh::ATTRIBUTE_JOINT_WEIGHT)
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{
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shader_defs.push(String::from("SKINNED"));
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vertex_attributes.push(Mesh::ATTRIBUTE_JOINT_INDEX.at_shader_location(4));
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vertex_attributes.push(Mesh::ATTRIBUTE_JOINT_WEIGHT.at_shader_location(5));
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bind_group_layout.push(self.skinned_mesh_layout.clone());
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} else {
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bind_group_layout.push(self.mesh_layout.clone());
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}
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let vertex_buffer_layout = layout.get_layout(&vertex_attributes)?;
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Ok(RenderPipelineDescriptor {
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vertex: VertexState {
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shader: SHADOW_SHADER_HANDLE.typed::<Shader>(),
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entry_point: "vertex".into(),
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shader_defs,
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buffers: vec![vertex_buffer_layout],
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},
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fragment: None,
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layout: Some(bind_group_layout),
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primitive: PrimitiveState {
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topology: key.primitive_topology(),
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strip_index_format: None,
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front_face: FrontFace::Ccw,
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cull_mode: None,
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unclipped_depth: false,
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polygon_mode: PolygonMode::Fill,
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conservative: false,
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},
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depth_stencil: Some(DepthStencilState {
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format: SHADOW_FORMAT,
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depth_write_enabled: true,
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depth_compare: CompareFunction::GreaterEqual,
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stencil: StencilState {
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front: StencilFaceState::IGNORE,
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back: StencilFaceState::IGNORE,
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read_mask: 0,
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write_mask: 0,
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},
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bias: DepthBiasState {
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constant: 0,
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slope_scale: 0.0,
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clamp: 0.0,
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},
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}),
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multisample: MultisampleState::default(),
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label: Some("shadow_pipeline".into()),
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})
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}
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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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near: f32,
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far: f32,
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/// Number of clusters in `X` / `Y` / `Z` in the view frustum
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dimensions: UVec3,
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}
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#[derive(Component)]
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pub struct ExtractedClustersPointLights {
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data: Vec<VisiblePointLights>,
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}
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pub fn extract_clusters(
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mut commands: Commands,
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views: Extract<Query<(Entity, &Clusters), With<Camera>>>,
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) {
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for (entity, clusters) in &views {
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commands.get_or_spawn(entity).insert((
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ExtractedClustersPointLights {
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data: clusters.lights.clone(),
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},
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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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#[allow(clippy::too_many_arguments)]
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pub fn extract_lights(
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mut commands: Commands,
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point_light_shadow_map: Extract<Res<PointLightShadowMap>>,
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directional_light_shadow_map: Extract<Res<DirectionalLightShadowMap>>,
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global_point_lights: Extract<Res<GlobalVisiblePointLights>>,
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point_lights: Extract<
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Query<(
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&PointLight,
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&CubemapVisibleEntities,
|
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&GlobalTransform,
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&ComputedVisibility,
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)>,
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>,
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spot_lights: Extract<
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Query<(
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&SpotLight,
|
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&VisibleEntities,
|
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&GlobalTransform,
|
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&ComputedVisibility,
|
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)>,
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>,
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directional_lights: Extract<
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Query<
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(
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Entity,
|
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&DirectionalLight,
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&VisibleEntities,
|
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&GlobalTransform,
|
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&ComputedVisibility,
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),
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Without<SpotLight>,
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>,
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>,
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mut previous_point_lights_len: Local<usize>,
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mut previous_spot_lights_len: Local<usize>,
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) {
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// NOTE: These shadow map resources are extracted here as they are used here too so this avoids
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// races between scheduling of ExtractResourceSystems and this system.
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if point_light_shadow_map.is_changed() {
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commands.insert_resource(point_light_shadow_map.clone());
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}
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if directional_light_shadow_map.is_changed() {
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commands.insert_resource(directional_light_shadow_map.clone());
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}
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// This is the point light shadow map texel size for one face of the cube as a distance of 1.0
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// world unit from the light.
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|
// point_light_texel_size = 2.0 * 1.0 * tan(PI / 4.0) / cube face width in texels
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// PI / 4.0 is half the cube face fov, tan(PI / 4.0) = 1.0, so this simplifies to:
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// point_light_texel_size = 2.0 / cube face width in texels
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|
// NOTE: When using various PCF kernel sizes, this will need to be adjusted, according to:
|
|
// https://catlikecoding.com/unity/tutorials/custom-srp/point-and-spot-shadows/
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let point_light_texel_size = 2.0 / point_light_shadow_map.size as f32;
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let mut point_lights_values = Vec::with_capacity(*previous_point_lights_len);
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for entity in global_point_lights.iter().copied() {
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if let Ok((point_light, cubemap_visible_entities, transform, visibility)) =
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point_lights.get(entity)
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{
|
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if !visibility.is_visible() {
|
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continue;
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}
|
|
// TODO: This is very much not ideal. We should be able to re-use the vector memory.
|
|
// However, since exclusive access to the main world in extract is ill-advised, we just clone here.
|
|
let render_cubemap_visible_entities = cubemap_visible_entities.clone();
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point_lights_values.push((
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entity,
|
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(
|
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ExtractedPointLight {
|
|
color: point_light.color,
|
|
// NOTE: Map from luminous power in lumens to luminous intensity in lumens per steradian
|
|
// for a point light. See https://google.github.io/filament/Filament.html#mjx-eqn-pointLightLuminousPower
|
|
// for details.
|
|
intensity: point_light.intensity / (4.0 * std::f32::consts::PI),
|
|
range: point_light.range,
|
|
radius: point_light.radius,
|
|
transform: *transform,
|
|
shadows_enabled: point_light.shadows_enabled,
|
|
shadow_depth_bias: point_light.shadow_depth_bias,
|
|
// The factor of SQRT_2 is for the worst-case diagonal offset
|
|
shadow_normal_bias: point_light.shadow_normal_bias
|
|
* point_light_texel_size
|
|
* std::f32::consts::SQRT_2,
|
|
spot_light_angles: None,
|
|
},
|
|
render_cubemap_visible_entities,
|
|
),
|
|
));
|
|
}
|
|
}
|
|
*previous_point_lights_len = point_lights_values.len();
|
|
commands.insert_or_spawn_batch(point_lights_values);
|
|
|
|
let mut spot_lights_values = Vec::with_capacity(*previous_spot_lights_len);
|
|
for entity in global_point_lights.iter().copied() {
|
|
if let Ok((spot_light, visible_entities, transform, visibility)) = spot_lights.get(entity) {
|
|
if !visibility.is_visible() {
|
|
continue;
|
|
}
|
|
// TODO: This is very much not ideal. We should be able to re-use the vector memory.
|
|
// However, since exclusive access to the main world in extract is ill-advised, we just clone here.
|
|
let render_visible_entities = visible_entities.clone();
|
|
let texel_size =
|
|
2.0 * spot_light.outer_angle.tan() / directional_light_shadow_map.size as f32;
|
|
|
|
spot_lights_values.push((
|
|
entity,
|
|
(
|
|
ExtractedPointLight {
|
|
color: spot_light.color,
|
|
// NOTE: Map from luminous power in lumens to luminous intensity in lumens per steradian
|
|
// for a point light. See https://google.github.io/filament/Filament.html#mjx-eqn-pointLightLuminousPower
|
|
// for details.
|
|
// Note: Filament uses a divisor of PI for spot lights. We choose to use the same 4*PI divisor
|
|
// in both cases so that toggling between point light and spot light keeps lit areas lit equally,
|
|
// which seems least surprising for users
|
|
intensity: spot_light.intensity / (4.0 * std::f32::consts::PI),
|
|
range: spot_light.range,
|
|
radius: spot_light.radius,
|
|
transform: *transform,
|
|
shadows_enabled: spot_light.shadows_enabled,
|
|
shadow_depth_bias: spot_light.shadow_depth_bias,
|
|
// The factor of SQRT_2 is for the worst-case diagonal offset
|
|
shadow_normal_bias: spot_light.shadow_normal_bias
|
|
* texel_size
|
|
* std::f32::consts::SQRT_2,
|
|
spot_light_angles: Some((spot_light.inner_angle, spot_light.outer_angle)),
|
|
},
|
|
render_visible_entities,
|
|
),
|
|
));
|
|
}
|
|
}
|
|
*previous_spot_lights_len = spot_lights_values.len();
|
|
commands.insert_or_spawn_batch(spot_lights_values);
|
|
|
|
for (entity, directional_light, visible_entities, transform, visibility) in
|
|
directional_lights.iter()
|
|
{
|
|
if !visibility.is_visible() {
|
|
continue;
|
|
}
|
|
|
|
// Calulate the directional light shadow map texel size using the largest x,y dimension of
|
|
// the orthographic projection divided by the shadow map resolution
|
|
// NOTE: When using various PCF kernel sizes, this will need to be adjusted, according to:
|
|
// https://catlikecoding.com/unity/tutorials/custom-srp/directional-shadows/
|
|
let largest_dimension = (directional_light.shadow_projection.right
|
|
- directional_light.shadow_projection.left)
|
|
.max(
|
|
directional_light.shadow_projection.top
|
|
- directional_light.shadow_projection.bottom,
|
|
);
|
|
let directional_light_texel_size =
|
|
largest_dimension / directional_light_shadow_map.size as f32;
|
|
// TODO: As above
|
|
let render_visible_entities = visible_entities.clone();
|
|
commands.get_or_spawn(entity).insert((
|
|
ExtractedDirectionalLight {
|
|
color: directional_light.color,
|
|
illuminance: directional_light.illuminance,
|
|
direction: transform.forward(),
|
|
projection: directional_light.shadow_projection.get_projection_matrix(),
|
|
shadows_enabled: directional_light.shadows_enabled,
|
|
shadow_depth_bias: directional_light.shadow_depth_bias,
|
|
// The factor of SQRT_2 is for the worst-case diagonal offset
|
|
shadow_normal_bias: directional_light.shadow_normal_bias
|
|
* directional_light_texel_size
|
|
* std::f32::consts::SQRT_2,
|
|
},
|
|
render_visible_entities,
|
|
));
|
|
}
|
|
}
|
|
|
|
pub(crate) const POINT_LIGHT_NEAR_Z: f32 = 0.1f32;
|
|
|
|
pub(crate) struct CubeMapFace {
|
|
pub(crate) target: Vec3,
|
|
pub(crate) up: Vec3,
|
|
}
|
|
|
|
// see https://www.khronos.org/opengl/wiki/Cubemap_Texture
|
|
pub(crate) const CUBE_MAP_FACES: [CubeMapFace; 6] = [
|
|
// 0 GL_TEXTURE_CUBE_MAP_POSITIVE_X
|
|
CubeMapFace {
|
|
target: Vec3::NEG_X,
|
|
up: Vec3::NEG_Y,
|
|
},
|
|
// 1 GL_TEXTURE_CUBE_MAP_NEGATIVE_X
|
|
CubeMapFace {
|
|
target: Vec3::X,
|
|
up: Vec3::NEG_Y,
|
|
},
|
|
// 2 GL_TEXTURE_CUBE_MAP_POSITIVE_Y
|
|
CubeMapFace {
|
|
target: Vec3::NEG_Y,
|
|
up: Vec3::Z,
|
|
},
|
|
// 3 GL_TEXTURE_CUBE_MAP_NEGATIVE_Y
|
|
CubeMapFace {
|
|
target: Vec3::Y,
|
|
up: Vec3::NEG_Z,
|
|
},
|
|
// 4 GL_TEXTURE_CUBE_MAP_POSITIVE_Z
|
|
CubeMapFace {
|
|
target: Vec3::NEG_Z,
|
|
up: Vec3::NEG_Y,
|
|
},
|
|
// 5 GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
|
|
CubeMapFace {
|
|
target: Vec3::Z,
|
|
up: Vec3::NEG_Y,
|
|
},
|
|
];
|
|
|
|
fn face_index_to_name(face_index: usize) -> &'static str {
|
|
match face_index {
|
|
0 => "+x",
|
|
1 => "-x",
|
|
2 => "+y",
|
|
3 => "-y",
|
|
4 => "+z",
|
|
5 => "-z",
|
|
_ => "invalid",
|
|
}
|
|
}
|
|
|
|
#[derive(Component)]
|
|
pub struct ShadowView {
|
|
pub depth_texture_view: TextureView,
|
|
pub pass_name: String,
|
|
}
|
|
|
|
#[derive(Component)]
|
|
pub struct ViewShadowBindings {
|
|
pub point_light_depth_texture: Texture,
|
|
pub point_light_depth_texture_view: TextureView,
|
|
pub directional_light_depth_texture: Texture,
|
|
pub directional_light_depth_texture_view: TextureView,
|
|
}
|
|
|
|
#[derive(Component)]
|
|
pub struct ViewLightEntities {
|
|
pub lights: Vec<Entity>,
|
|
}
|
|
|
|
#[derive(Component)]
|
|
pub struct ViewLightsUniformOffset {
|
|
pub offset: u32,
|
|
}
|
|
|
|
// NOTE: Clustered-forward rendering requires 3 storage buffer bindings so check that
|
|
// at least that many are supported using this constant and SupportedBindingType::from_device()
|
|
pub const CLUSTERED_FORWARD_STORAGE_BUFFER_COUNT: u32 = 3;
|
|
|
|
#[derive(Resource)]
|
|
pub struct GlobalLightMeta {
|
|
pub gpu_point_lights: GpuPointLights,
|
|
pub entity_to_index: HashMap<Entity, usize>,
|
|
}
|
|
|
|
impl FromWorld for GlobalLightMeta {
|
|
fn from_world(world: &mut World) -> Self {
|
|
Self::new(
|
|
world
|
|
.resource::<RenderDevice>()
|
|
.get_supported_read_only_binding_type(CLUSTERED_FORWARD_STORAGE_BUFFER_COUNT),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl GlobalLightMeta {
|
|
pub fn new(buffer_binding_type: BufferBindingType) -> Self {
|
|
Self {
|
|
gpu_point_lights: GpuPointLights::new(buffer_binding_type),
|
|
entity_to_index: HashMap::default(),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Resource, Default)]
|
|
pub struct LightMeta {
|
|
pub view_gpu_lights: DynamicUniformBuffer<GpuLights>,
|
|
pub shadow_view_bind_group: Option<BindGroup>,
|
|
}
|
|
|
|
#[derive(Component)]
|
|
pub enum LightEntity {
|
|
Directional {
|
|
light_entity: Entity,
|
|
},
|
|
Point {
|
|
light_entity: Entity,
|
|
face_index: usize,
|
|
},
|
|
Spot {
|
|
light_entity: Entity,
|
|
},
|
|
}
|
|
pub fn calculate_cluster_factors(
|
|
near: f32,
|
|
far: f32,
|
|
z_slices: f32,
|
|
is_orthographic: bool,
|
|
) -> Vec2 {
|
|
if is_orthographic {
|
|
Vec2::new(-near, z_slices / (-far - -near))
|
|
} else {
|
|
let z_slices_of_ln_zfar_over_znear = (z_slices - 1.0) / (far / near).ln();
|
|
Vec2::new(
|
|
z_slices_of_ln_zfar_over_znear,
|
|
near.ln() * z_slices_of_ln_zfar_over_znear,
|
|
)
|
|
}
|
|
}
|
|
|
|
// this method of constructing a basis from a vec3 is used by glam::Vec3::any_orthonormal_pair
|
|
// we will also construct it in the fragment shader and need our implementations to match,
|
|
// so we reproduce it here to avoid a mismatch if glam changes. we also switch the handedness
|
|
// could move this onto transform but it's pretty niche
|
|
pub(crate) fn spot_light_view_matrix(transform: &GlobalTransform) -> Mat4 {
|
|
// the matrix z_local (opposite of transform.forward())
|
|
let fwd_dir = transform.back().extend(0.0);
|
|
|
|
let sign = 1f32.copysign(fwd_dir.z);
|
|
let a = -1.0 / (fwd_dir.z + sign);
|
|
let b = fwd_dir.x * fwd_dir.y * a;
|
|
let up_dir = Vec4::new(
|
|
1.0 + sign * fwd_dir.x * fwd_dir.x * a,
|
|
sign * b,
|
|
-sign * fwd_dir.x,
|
|
0.0,
|
|
);
|
|
let right_dir = Vec4::new(-b, -sign - fwd_dir.y * fwd_dir.y * a, fwd_dir.y, 0.0);
|
|
|
|
Mat4::from_cols(
|
|
right_dir,
|
|
up_dir,
|
|
fwd_dir,
|
|
transform.translation().extend(1.0),
|
|
)
|
|
}
|
|
|
|
pub(crate) fn spot_light_projection_matrix(angle: f32) -> Mat4 {
|
|
// spot light projection FOV is 2x the angle from spot light centre to outer edge
|
|
Mat4::perspective_infinite_reverse_rh(angle * 2.0, 1.0, POINT_LIGHT_NEAR_Z)
|
|
}
|
|
|
|
#[allow(clippy::too_many_arguments)]
|
|
pub fn prepare_lights(
|
|
mut commands: Commands,
|
|
mut texture_cache: ResMut<TextureCache>,
|
|
render_device: Res<RenderDevice>,
|
|
render_queue: Res<RenderQueue>,
|
|
mut global_light_meta: ResMut<GlobalLightMeta>,
|
|
mut light_meta: ResMut<LightMeta>,
|
|
views: Query<
|
|
(Entity, &ExtractedView, &ExtractedClusterConfig),
|
|
With<RenderPhase<Transparent3d>>,
|
|
>,
|
|
ambient_light: Res<AmbientLight>,
|
|
point_light_shadow_map: Res<PointLightShadowMap>,
|
|
directional_light_shadow_map: Res<DirectionalLightShadowMap>,
|
|
point_lights: Query<(Entity, &ExtractedPointLight)>,
|
|
directional_lights: Query<(Entity, &ExtractedDirectionalLight)>,
|
|
) {
|
|
light_meta.view_gpu_lights.clear();
|
|
|
|
// Pre-calculate for PointLights
|
|
let cube_face_projection =
|
|
Mat4::perspective_infinite_reverse_rh(std::f32::consts::FRAC_PI_2, 1.0, POINT_LIGHT_NEAR_Z);
|
|
let cube_face_rotations = CUBE_MAP_FACES
|
|
.iter()
|
|
.map(|CubeMapFace { target, up }| Transform::IDENTITY.looking_at(*target, *up))
|
|
.collect::<Vec<_>>();
|
|
|
|
global_light_meta.entity_to_index.clear();
|
|
|
|
let mut point_lights: Vec<_> = point_lights.iter().collect::<Vec<_>>();
|
|
|
|
#[cfg(not(feature = "webgl"))]
|
|
let max_texture_array_layers = render_device.limits().max_texture_array_layers as usize;
|
|
#[cfg(not(feature = "webgl"))]
|
|
let max_texture_cubes = max_texture_array_layers / 6;
|
|
#[cfg(feature = "webgl")]
|
|
let max_texture_array_layers = 1;
|
|
#[cfg(feature = "webgl")]
|
|
let max_texture_cubes = 1;
|
|
|
|
let point_light_count = point_lights
|
|
.iter()
|
|
.filter(|light| light.1.spot_light_angles.is_none())
|
|
.count();
|
|
|
|
let point_light_shadow_maps_count = point_lights
|
|
.iter()
|
|
.filter(|light| light.1.shadows_enabled && light.1.spot_light_angles.is_none())
|
|
.count()
|
|
.min(max_texture_cubes);
|
|
|
|
let directional_shadow_maps_count = directional_lights
|
|
.iter()
|
|
.filter(|(_, light)| light.shadows_enabled)
|
|
.count()
|
|
.min(max_texture_array_layers);
|
|
|
|
let spot_light_shadow_maps_count = point_lights
|
|
.iter()
|
|
.filter(|(_, light)| light.shadows_enabled && light.spot_light_angles.is_some())
|
|
.count()
|
|
.min(max_texture_array_layers - directional_shadow_maps_count);
|
|
|
|
// Sort lights by
|
|
// - point-light vs spot-light, so that we can iterate point lights and spot lights in contiguous blocks in the fragment shader,
|
|
// - then those with shadows enabled first, so that the index can be used to render at most `point_light_shadow_maps_count`
|
|
// point light shadows and `spot_light_shadow_maps_count` spot light shadow maps,
|
|
// - then by entity as a stable key to ensure that a consistent set of lights are chosen if the light count limit is exceeded.
|
|
point_lights.sort_by(|(entity_1, light_1), (entity_2, light_2)| {
|
|
point_light_order(
|
|
(
|
|
entity_1,
|
|
&light_1.shadows_enabled,
|
|
&light_1.spot_light_angles.is_some(),
|
|
),
|
|
(
|
|
entity_2,
|
|
&light_2.shadows_enabled,
|
|
&light_2.spot_light_angles.is_some(),
|
|
),
|
|
)
|
|
});
|
|
|
|
if global_light_meta.entity_to_index.capacity() < point_lights.len() {
|
|
global_light_meta
|
|
.entity_to_index
|
|
.reserve(point_lights.len());
|
|
}
|
|
|
|
let mut gpu_point_lights = Vec::new();
|
|
for (index, &(entity, light)) in point_lights.iter().enumerate() {
|
|
let mut flags = PointLightFlags::NONE;
|
|
|
|
// Lights are sorted, shadow enabled lights are first
|
|
if light.shadows_enabled
|
|
&& (index < point_light_shadow_maps_count
|
|
|| (light.spot_light_angles.is_some()
|
|
&& index - point_light_count < spot_light_shadow_maps_count))
|
|
{
|
|
flags |= PointLightFlags::SHADOWS_ENABLED;
|
|
}
|
|
|
|
let (light_custom_data, spot_light_tan_angle) = match light.spot_light_angles {
|
|
Some((inner, outer)) => {
|
|
let light_direction = light.transform.forward();
|
|
if light_direction.y.is_sign_negative() {
|
|
flags |= PointLightFlags::SPOT_LIGHT_Y_NEGATIVE;
|
|
}
|
|
|
|
let cos_outer = outer.cos();
|
|
let spot_scale = 1.0 / f32::max(inner.cos() - cos_outer, 1e-4);
|
|
let spot_offset = -cos_outer * spot_scale;
|
|
|
|
(
|
|
// For spot lights: the direction (x,z), spot_scale and spot_offset
|
|
light_direction.xz().extend(spot_scale).extend(spot_offset),
|
|
outer.tan(),
|
|
)
|
|
}
|
|
None => {
|
|
(
|
|
// For point lights: the lower-right 2x2 values of the projection matrix [2][2] [2][3] [3][2] [3][3]
|
|
Vec4::new(
|
|
cube_face_projection.z_axis.z,
|
|
cube_face_projection.z_axis.w,
|
|
cube_face_projection.w_axis.z,
|
|
cube_face_projection.w_axis.w,
|
|
),
|
|
// unused
|
|
0.0,
|
|
)
|
|
}
|
|
};
|
|
|
|
gpu_point_lights.push(GpuPointLight {
|
|
light_custom_data,
|
|
// premultiply color by intensity
|
|
// we don't use the alpha at all, so no reason to multiply only [0..3]
|
|
color_inverse_square_range: (Vec4::from_slice(&light.color.as_linear_rgba_f32())
|
|
* light.intensity)
|
|
.xyz()
|
|
.extend(1.0 / (light.range * light.range)),
|
|
position_radius: light.transform.translation().extend(light.radius),
|
|
flags: flags.bits,
|
|
shadow_depth_bias: light.shadow_depth_bias,
|
|
shadow_normal_bias: light.shadow_normal_bias,
|
|
spot_light_tan_angle,
|
|
});
|
|
global_light_meta.entity_to_index.insert(entity, index);
|
|
}
|
|
|
|
global_light_meta.gpu_point_lights.set(gpu_point_lights);
|
|
global_light_meta
|
|
.gpu_point_lights
|
|
.write_buffer(&render_device, &render_queue);
|
|
|
|
// set up light data for each view
|
|
for (entity, extracted_view, clusters) in &views {
|
|
let point_light_depth_texture = texture_cache.get(
|
|
&render_device,
|
|
TextureDescriptor {
|
|
size: Extent3d {
|
|
width: point_light_shadow_map.size as u32,
|
|
height: point_light_shadow_map.size as u32,
|
|
depth_or_array_layers: point_light_shadow_maps_count.max(1) as u32 * 6,
|
|
},
|
|
mip_level_count: 1,
|
|
sample_count: 1,
|
|
dimension: TextureDimension::D2,
|
|
format: SHADOW_FORMAT,
|
|
label: Some("point_light_shadow_map_texture"),
|
|
usage: TextureUsages::RENDER_ATTACHMENT | TextureUsages::TEXTURE_BINDING,
|
|
},
|
|
);
|
|
let directional_light_depth_texture = texture_cache.get(
|
|
&render_device,
|
|
TextureDescriptor {
|
|
size: Extent3d {
|
|
width: (directional_light_shadow_map.size as u32)
|
|
.min(render_device.limits().max_texture_dimension_2d),
|
|
height: (directional_light_shadow_map.size as u32)
|
|
.min(render_device.limits().max_texture_dimension_2d),
|
|
depth_or_array_layers: (directional_shadow_maps_count
|
|
+ spot_light_shadow_maps_count)
|
|
.max(1) as u32,
|
|
},
|
|
mip_level_count: 1,
|
|
sample_count: 1,
|
|
dimension: TextureDimension::D2,
|
|
format: SHADOW_FORMAT,
|
|
label: Some("directional_light_shadow_map_texture"),
|
|
usage: TextureUsages::RENDER_ATTACHMENT | TextureUsages::TEXTURE_BINDING,
|
|
},
|
|
);
|
|
let mut view_lights = Vec::new();
|
|
|
|
let is_orthographic = extracted_view.projection.w_axis.w == 1.0;
|
|
let cluster_factors_zw = calculate_cluster_factors(
|
|
clusters.near,
|
|
clusters.far,
|
|
clusters.dimensions.z as f32,
|
|
is_orthographic,
|
|
);
|
|
|
|
let n_clusters = clusters.dimensions.x * clusters.dimensions.y * clusters.dimensions.z;
|
|
let mut gpu_lights = GpuLights {
|
|
directional_lights: [GpuDirectionalLight::default(); MAX_DIRECTIONAL_LIGHTS],
|
|
ambient_color: Vec4::from_slice(&ambient_light.color.as_linear_rgba_f32())
|
|
* ambient_light.brightness,
|
|
cluster_factors: Vec4::new(
|
|
clusters.dimensions.x as f32 / extracted_view.viewport.z as f32,
|
|
clusters.dimensions.y as f32 / extracted_view.viewport.w as f32,
|
|
cluster_factors_zw.x,
|
|
cluster_factors_zw.y,
|
|
),
|
|
cluster_dimensions: clusters.dimensions.extend(n_clusters),
|
|
n_directional_lights: directional_lights.iter().len() as u32,
|
|
// spotlight shadow maps are stored in the directional light array, starting at directional_shadow_maps_count.
|
|
// the spot lights themselves start in the light array at point_light_count. so to go from light
|
|
// index to shadow map index, we need to subtract point light count and add directional shadowmap count.
|
|
spot_light_shadowmap_offset: directional_shadow_maps_count as i32
|
|
- point_light_count as i32,
|
|
};
|
|
|
|
// TODO: this should select lights based on relevance to the view instead of the first ones that show up in a query
|
|
for &(light_entity, light) in point_lights
|
|
.iter()
|
|
// Lights are sorted, shadow enabled lights are first
|
|
.take(point_light_shadow_maps_count)
|
|
.filter(|(_, light)| light.shadows_enabled)
|
|
{
|
|
let light_index = *global_light_meta
|
|
.entity_to_index
|
|
.get(&light_entity)
|
|
.unwrap();
|
|
// ignore scale because we don't want to effectively scale light radius and range
|
|
// by applying those as a view transform to shadow map rendering of objects
|
|
// and ignore rotation because we want the shadow map projections to align with the axes
|
|
let view_translation = GlobalTransform::from_translation(light.transform.translation());
|
|
|
|
for (face_index, view_rotation) in cube_face_rotations.iter().enumerate() {
|
|
let depth_texture_view =
|
|
point_light_depth_texture
|
|
.texture
|
|
.create_view(&TextureViewDescriptor {
|
|
label: Some("point_light_shadow_map_texture_view"),
|
|
format: None,
|
|
dimension: Some(TextureViewDimension::D2),
|
|
aspect: TextureAspect::All,
|
|
base_mip_level: 0,
|
|
mip_level_count: None,
|
|
base_array_layer: (light_index * 6 + face_index) as u32,
|
|
array_layer_count: NonZeroU32::new(1),
|
|
});
|
|
|
|
let view_light_entity = commands
|
|
.spawn((
|
|
ShadowView {
|
|
depth_texture_view,
|
|
pass_name: format!(
|
|
"shadow pass point light {} {}",
|
|
light_index,
|
|
face_index_to_name(face_index)
|
|
),
|
|
},
|
|
ExtractedView {
|
|
viewport: UVec4::new(
|
|
0,
|
|
0,
|
|
point_light_shadow_map.size as u32,
|
|
point_light_shadow_map.size as u32,
|
|
),
|
|
transform: view_translation * *view_rotation,
|
|
projection: cube_face_projection,
|
|
},
|
|
RenderPhase::<Shadow>::default(),
|
|
LightEntity::Point {
|
|
light_entity,
|
|
face_index,
|
|
},
|
|
))
|
|
.id();
|
|
view_lights.push(view_light_entity);
|
|
}
|
|
}
|
|
|
|
// spot lights
|
|
for (light_index, &(light_entity, light)) in point_lights
|
|
.iter()
|
|
.skip(point_light_count)
|
|
.take(spot_light_shadow_maps_count)
|
|
.enumerate()
|
|
{
|
|
let spot_view_matrix = spot_light_view_matrix(&light.transform);
|
|
let spot_view_transform = spot_view_matrix.into();
|
|
|
|
let angle = light.spot_light_angles.expect("lights should be sorted so that \
|
|
[point_light_count..point_light_count + spot_light_shadow_maps_count] are spot lights").1;
|
|
let spot_projection = spot_light_projection_matrix(angle);
|
|
|
|
let depth_texture_view =
|
|
directional_light_depth_texture
|
|
.texture
|
|
.create_view(&TextureViewDescriptor {
|
|
label: Some("spot_light_shadow_map_texture_view"),
|
|
format: None,
|
|
dimension: Some(TextureViewDimension::D2),
|
|
aspect: TextureAspect::All,
|
|
base_mip_level: 0,
|
|
mip_level_count: None,
|
|
base_array_layer: (directional_shadow_maps_count + light_index) as u32,
|
|
array_layer_count: NonZeroU32::new(1),
|
|
});
|
|
|
|
let view_light_entity = commands
|
|
.spawn((
|
|
ShadowView {
|
|
depth_texture_view,
|
|
pass_name: format!("shadow pass spot light {}", light_index,),
|
|
},
|
|
ExtractedView {
|
|
viewport: UVec4::new(
|
|
0,
|
|
0,
|
|
directional_light_shadow_map.size as u32,
|
|
directional_light_shadow_map.size as u32,
|
|
),
|
|
transform: spot_view_transform,
|
|
projection: spot_projection,
|
|
},
|
|
RenderPhase::<Shadow>::default(),
|
|
LightEntity::Spot { light_entity },
|
|
))
|
|
.id();
|
|
|
|
view_lights.push(view_light_entity);
|
|
}
|
|
|
|
for (i, (light_entity, light)) in directional_lights
|
|
.iter()
|
|
.enumerate()
|
|
.take(MAX_DIRECTIONAL_LIGHTS)
|
|
{
|
|
// direction is negated to be ready for N.L
|
|
let dir_to_light = -light.direction;
|
|
|
|
// convert from illuminance (lux) to candelas
|
|
//
|
|
// exposure is hard coded at the moment but should be replaced
|
|
// by values coming from the camera
|
|
// see: https://google.github.io/filament/Filament.html#imagingpipeline/physicallybasedcamera/exposuresettings
|
|
const APERTURE: f32 = 4.0;
|
|
const SHUTTER_SPEED: f32 = 1.0 / 250.0;
|
|
const SENSITIVITY: f32 = 100.0;
|
|
let ev100 =
|
|
f32::log2(APERTURE * APERTURE / SHUTTER_SPEED) - f32::log2(SENSITIVITY / 100.0);
|
|
let exposure = 1.0 / (f32::powf(2.0, ev100) * 1.2);
|
|
let intensity = light.illuminance * exposure;
|
|
|
|
// NOTE: A directional light seems to have to have an eye position on the line along the direction of the light
|
|
// through the world origin. I (Rob Swain) do not yet understand why it cannot be translated away from this.
|
|
let view = Mat4::look_at_rh(Vec3::ZERO, light.direction, Vec3::Y);
|
|
// NOTE: This orthographic projection defines the volume within which shadows from a directional light can be cast
|
|
let projection = light.projection;
|
|
|
|
let mut flags = DirectionalLightFlags::NONE;
|
|
if light.shadows_enabled {
|
|
flags |= DirectionalLightFlags::SHADOWS_ENABLED;
|
|
}
|
|
|
|
gpu_lights.directional_lights[i] = GpuDirectionalLight {
|
|
// premultiply color by intensity
|
|
// we don't use the alpha at all, so no reason to multiply only [0..3]
|
|
color: Vec4::from_slice(&light.color.as_linear_rgba_f32()) * intensity,
|
|
dir_to_light,
|
|
// NOTE: * view is correct, it should not be view.inverse() here
|
|
view_projection: projection * view,
|
|
flags: flags.bits,
|
|
shadow_depth_bias: light.shadow_depth_bias,
|
|
shadow_normal_bias: light.shadow_normal_bias,
|
|
};
|
|
|
|
if light.shadows_enabled {
|
|
let depth_texture_view =
|
|
directional_light_depth_texture
|
|
.texture
|
|
.create_view(&TextureViewDescriptor {
|
|
label: Some("directional_light_shadow_map_texture_view"),
|
|
format: None,
|
|
dimension: Some(TextureViewDimension::D2),
|
|
aspect: TextureAspect::All,
|
|
base_mip_level: 0,
|
|
mip_level_count: None,
|
|
base_array_layer: i as u32,
|
|
array_layer_count: NonZeroU32::new(1),
|
|
});
|
|
|
|
let view_light_entity = commands
|
|
.spawn((
|
|
ShadowView {
|
|
depth_texture_view,
|
|
pass_name: format!("shadow pass directional light {}", i),
|
|
},
|
|
ExtractedView {
|
|
viewport: UVec4::new(
|
|
0,
|
|
0,
|
|
directional_light_shadow_map.size as u32,
|
|
directional_light_shadow_map.size as u32,
|
|
),
|
|
transform: GlobalTransform::from(view.inverse()),
|
|
projection,
|
|
},
|
|
RenderPhase::<Shadow>::default(),
|
|
LightEntity::Directional { light_entity },
|
|
))
|
|
.id();
|
|
view_lights.push(view_light_entity);
|
|
}
|
|
}
|
|
let point_light_depth_texture_view =
|
|
point_light_depth_texture
|
|
.texture
|
|
.create_view(&TextureViewDescriptor {
|
|
label: Some("point_light_shadow_map_array_texture_view"),
|
|
format: None,
|
|
#[cfg(not(feature = "webgl"))]
|
|
dimension: Some(TextureViewDimension::CubeArray),
|
|
#[cfg(feature = "webgl")]
|
|
dimension: Some(TextureViewDimension::Cube),
|
|
aspect: TextureAspect::All,
|
|
base_mip_level: 0,
|
|
mip_level_count: None,
|
|
base_array_layer: 0,
|
|
array_layer_count: None,
|
|
});
|
|
let directional_light_depth_texture_view = directional_light_depth_texture
|
|
.texture
|
|
.create_view(&TextureViewDescriptor {
|
|
label: Some("directional_light_shadow_map_array_texture_view"),
|
|
format: None,
|
|
#[cfg(not(feature = "webgl"))]
|
|
dimension: Some(TextureViewDimension::D2Array),
|
|
#[cfg(feature = "webgl")]
|
|
dimension: Some(TextureViewDimension::D2),
|
|
aspect: TextureAspect::All,
|
|
base_mip_level: 0,
|
|
mip_level_count: None,
|
|
base_array_layer: 0,
|
|
array_layer_count: None,
|
|
});
|
|
|
|
commands.entity(entity).insert((
|
|
ViewShadowBindings {
|
|
point_light_depth_texture: point_light_depth_texture.texture,
|
|
point_light_depth_texture_view,
|
|
directional_light_depth_texture: directional_light_depth_texture.texture,
|
|
directional_light_depth_texture_view,
|
|
},
|
|
ViewLightEntities {
|
|
lights: view_lights,
|
|
},
|
|
ViewLightsUniformOffset {
|
|
offset: light_meta.view_gpu_lights.push(gpu_lights),
|
|
},
|
|
));
|
|
}
|
|
|
|
light_meta
|
|
.view_gpu_lights
|
|
.write_buffer(&render_device, &render_queue);
|
|
}
|
|
|
|
// this must match CLUSTER_COUNT_SIZE in pbr.wgsl
|
|
// and must be large enough to contain MAX_UNIFORM_BUFFER_POINT_LIGHTS
|
|
const CLUSTER_COUNT_SIZE: u32 = 9;
|
|
|
|
const CLUSTER_OFFSET_MASK: u32 = (1 << (32 - (CLUSTER_COUNT_SIZE * 2))) - 1;
|
|
const CLUSTER_COUNT_MASK: u32 = (1 << CLUSTER_COUNT_SIZE) - 1;
|
|
|
|
// NOTE: With uniform buffer max binding size as 16384 bytes
|
|
// that means we can fit 256 point lights in one uniform
|
|
// buffer, which means the count can be at most 256 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
|
|
fn pack_offset_and_counts(offset: usize, point_count: usize, spot_count: usize) -> u32 {
|
|
((offset as u32 & CLUSTER_OFFSET_MASK) << (CLUSTER_COUNT_SIZE * 2))
|
|
| (point_count as u32 & CLUSTER_COUNT_MASK) << CLUSTER_COUNT_SIZE
|
|
| (spot_count as u32 & CLUSTER_COUNT_MASK)
|
|
}
|
|
|
|
#[derive(ShaderType)]
|
|
struct GpuClusterLightIndexListsUniform {
|
|
data: Box<[UVec4; ViewClusterBindings::MAX_UNIFORM_ITEMS]>,
|
|
}
|
|
|
|
// NOTE: Assert at compile time that GpuClusterLightIndexListsUniform
|
|
// fits within the maximum uniform buffer binding size
|
|
const _: () = assert!(GpuClusterLightIndexListsUniform::SHADER_SIZE.get() <= 16384);
|
|
|
|
impl Default for GpuClusterLightIndexListsUniform {
|
|
fn default() -> Self {
|
|
Self {
|
|
data: Box::new([UVec4::ZERO; ViewClusterBindings::MAX_UNIFORM_ITEMS]),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(ShaderType)]
|
|
struct GpuClusterOffsetsAndCountsUniform {
|
|
data: Box<[UVec4; ViewClusterBindings::MAX_UNIFORM_ITEMS]>,
|
|
}
|
|
|
|
impl Default for GpuClusterOffsetsAndCountsUniform {
|
|
fn default() -> Self {
|
|
Self {
|
|
data: Box::new([UVec4::ZERO; ViewClusterBindings::MAX_UNIFORM_ITEMS]),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(ShaderType, Default)]
|
|
struct GpuClusterLightIndexListsStorage {
|
|
#[size(runtime)]
|
|
data: Vec<u32>,
|
|
}
|
|
|
|
#[derive(ShaderType, Default)]
|
|
struct GpuClusterOffsetsAndCountsStorage {
|
|
#[size(runtime)]
|
|
data: Vec<UVec4>,
|
|
}
|
|
|
|
enum ViewClusterBuffers {
|
|
Uniform {
|
|
// NOTE: UVec4 is because all arrays in Std140 layout have 16-byte alignment
|
|
cluster_light_index_lists: UniformBuffer<GpuClusterLightIndexListsUniform>,
|
|
// NOTE: UVec4 is because all arrays in Std140 layout have 16-byte alignment
|
|
cluster_offsets_and_counts: UniformBuffer<GpuClusterOffsetsAndCountsUniform>,
|
|
},
|
|
Storage {
|
|
cluster_light_index_lists: StorageBuffer<GpuClusterLightIndexListsStorage>,
|
|
cluster_offsets_and_counts: StorageBuffer<GpuClusterOffsetsAndCountsStorage>,
|
|
},
|
|
}
|
|
|
|
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 {
|
|
cluster_light_index_lists: UniformBuffer::default(),
|
|
cluster_offsets_and_counts: UniformBuffer::default(),
|
|
}
|
|
}
|
|
|
|
fn storage() -> Self {
|
|
ViewClusterBuffers::Storage {
|
|
cluster_light_index_lists: StorageBuffer::default(),
|
|
cluster_offsets_and_counts: StorageBuffer::default(),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Component)]
|
|
pub struct ViewClusterBindings {
|
|
n_indices: usize,
|
|
n_offsets: usize,
|
|
buffers: ViewClusterBuffers,
|
|
}
|
|
|
|
impl ViewClusterBindings {
|
|
pub const MAX_OFFSETS: usize = 16384 / 4;
|
|
const MAX_UNIFORM_ITEMS: usize = Self::MAX_OFFSETS / 4;
|
|
pub const MAX_INDICES: usize = 16384;
|
|
|
|
pub fn new(buffer_binding_type: BufferBindingType) -> Self {
|
|
Self {
|
|
n_indices: 0,
|
|
n_offsets: 0,
|
|
buffers: ViewClusterBuffers::new(buffer_binding_type),
|
|
}
|
|
}
|
|
|
|
pub fn clear(&mut self) {
|
|
match &mut self.buffers {
|
|
ViewClusterBuffers::Uniform {
|
|
cluster_light_index_lists,
|
|
cluster_offsets_and_counts,
|
|
} => {
|
|
*cluster_light_index_lists.get_mut().data = [UVec4::ZERO; Self::MAX_UNIFORM_ITEMS];
|
|
*cluster_offsets_and_counts.get_mut().data = [UVec4::ZERO; Self::MAX_UNIFORM_ITEMS];
|
|
}
|
|
ViewClusterBuffers::Storage {
|
|
cluster_light_index_lists,
|
|
cluster_offsets_and_counts,
|
|
..
|
|
} => {
|
|
cluster_light_index_lists.get_mut().data.clear();
|
|
cluster_offsets_and_counts.get_mut().data.clear();
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn push_offset_and_counts(&mut self, offset: usize, point_count: usize, spot_count: usize) {
|
|
match &mut self.buffers {
|
|
ViewClusterBuffers::Uniform {
|
|
cluster_offsets_and_counts,
|
|
..
|
|
} => {
|
|
let array_index = self.n_offsets >> 2; // >> 2 is equivalent to / 4
|
|
if array_index >= Self::MAX_UNIFORM_ITEMS {
|
|
warn!("cluster offset and count out of bounds!");
|
|
return;
|
|
}
|
|
let component = self.n_offsets & ((1 << 2) - 1);
|
|
let packed = pack_offset_and_counts(offset, point_count, spot_count);
|
|
|
|
cluster_offsets_and_counts.get_mut().data[array_index][component] = packed;
|
|
}
|
|
ViewClusterBuffers::Storage {
|
|
cluster_offsets_and_counts,
|
|
..
|
|
} => {
|
|
cluster_offsets_and_counts.get_mut().data.push(UVec4::new(
|
|
offset as u32,
|
|
point_count as u32,
|
|
spot_count as u32,
|
|
0,
|
|
));
|
|
}
|
|
}
|
|
|
|
self.n_offsets += 1;
|
|
}
|
|
|
|
pub fn n_indices(&self) -> usize {
|
|
self.n_indices
|
|
}
|
|
|
|
pub fn push_index(&mut self, index: usize) {
|
|
match &mut self.buffers {
|
|
ViewClusterBuffers::Uniform {
|
|
cluster_light_index_lists,
|
|
..
|
|
} => {
|
|
let array_index = self.n_indices >> 4; // >> 4 is equivalent to / 16
|
|
let component = (self.n_indices >> 2) & ((1 << 2) - 1);
|
|
let sub_index = self.n_indices & ((1 << 2) - 1);
|
|
let index = index as u32;
|
|
|
|
cluster_light_index_lists.get_mut().data[array_index][component] |=
|
|
index << (8 * sub_index);
|
|
}
|
|
ViewClusterBuffers::Storage {
|
|
cluster_light_index_lists,
|
|
..
|
|
} => {
|
|
cluster_light_index_lists.get_mut().data.push(index as u32);
|
|
}
|
|
}
|
|
|
|
self.n_indices += 1;
|
|
}
|
|
|
|
pub fn write_buffers(&mut self, render_device: &RenderDevice, render_queue: &RenderQueue) {
|
|
match &mut self.buffers {
|
|
ViewClusterBuffers::Uniform {
|
|
cluster_light_index_lists,
|
|
cluster_offsets_and_counts,
|
|
} => {
|
|
cluster_light_index_lists.write_buffer(render_device, render_queue);
|
|
cluster_offsets_and_counts.write_buffer(render_device, render_queue);
|
|
}
|
|
ViewClusterBuffers::Storage {
|
|
cluster_light_index_lists,
|
|
cluster_offsets_and_counts,
|
|
} => {
|
|
cluster_light_index_lists.write_buffer(render_device, render_queue);
|
|
cluster_offsets_and_counts.write_buffer(render_device, render_queue);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn light_index_lists_binding(&self) -> Option<BindingResource> {
|
|
match &self.buffers {
|
|
ViewClusterBuffers::Uniform {
|
|
cluster_light_index_lists,
|
|
..
|
|
} => cluster_light_index_lists.binding(),
|
|
ViewClusterBuffers::Storage {
|
|
cluster_light_index_lists,
|
|
..
|
|
} => cluster_light_index_lists.binding(),
|
|
}
|
|
}
|
|
|
|
pub fn offsets_and_counts_binding(&self) -> Option<BindingResource> {
|
|
match &self.buffers {
|
|
ViewClusterBuffers::Uniform {
|
|
cluster_offsets_and_counts,
|
|
..
|
|
} => cluster_offsets_and_counts.binding(),
|
|
ViewClusterBuffers::Storage {
|
|
cluster_offsets_and_counts,
|
|
..
|
|
} => cluster_offsets_and_counts.binding(),
|
|
}
|
|
}
|
|
|
|
pub fn min_size_cluster_light_index_lists(
|
|
buffer_binding_type: BufferBindingType,
|
|
) -> NonZeroU64 {
|
|
match buffer_binding_type {
|
|
BufferBindingType::Storage { .. } => GpuClusterLightIndexListsStorage::min_size(),
|
|
BufferBindingType::Uniform => GpuClusterLightIndexListsUniform::min_size(),
|
|
}
|
|
}
|
|
|
|
pub fn min_size_cluster_offsets_and_counts(
|
|
buffer_binding_type: BufferBindingType,
|
|
) -> NonZeroU64 {
|
|
match buffer_binding_type {
|
|
BufferBindingType::Storage { .. } => GpuClusterOffsetsAndCountsStorage::min_size(),
|
|
BufferBindingType::Uniform => GpuClusterOffsetsAndCountsUniform::min_size(),
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn prepare_clusters(
|
|
mut commands: Commands,
|
|
render_device: Res<RenderDevice>,
|
|
render_queue: Res<RenderQueue>,
|
|
mesh_pipeline: Res<MeshPipeline>,
|
|
global_light_meta: Res<GlobalLightMeta>,
|
|
views: Query<
|
|
(
|
|
Entity,
|
|
&ExtractedClusterConfig,
|
|
&ExtractedClustersPointLights,
|
|
),
|
|
With<RenderPhase<Transparent3d>>,
|
|
>,
|
|
) {
|
|
let render_device = render_device.into_inner();
|
|
let supports_storage_buffers = matches!(
|
|
mesh_pipeline.clustered_forward_buffer_binding_type,
|
|
BufferBindingType::Storage { .. }
|
|
);
|
|
for (entity, cluster_config, extracted_clusters) in &views {
|
|
let mut view_clusters_bindings =
|
|
ViewClusterBindings::new(mesh_pipeline.clustered_forward_buffer_binding_type);
|
|
view_clusters_bindings.clear();
|
|
|
|
let mut indices_full = false;
|
|
|
|
let mut cluster_index = 0;
|
|
for _y in 0..cluster_config.dimensions.y {
|
|
for _x in 0..cluster_config.dimensions.x {
|
|
for _z in 0..cluster_config.dimensions.z {
|
|
let offset = view_clusters_bindings.n_indices();
|
|
let cluster_lights = &extracted_clusters.data[cluster_index];
|
|
view_clusters_bindings.push_offset_and_counts(
|
|
offset,
|
|
cluster_lights.point_light_count,
|
|
cluster_lights.spot_light_count,
|
|
);
|
|
|
|
if !indices_full {
|
|
for entity in cluster_lights.iter() {
|
|
if let Some(light_index) = global_light_meta.entity_to_index.get(entity)
|
|
{
|
|
if view_clusters_bindings.n_indices()
|
|
>= ViewClusterBindings::MAX_INDICES
|
|
&& !supports_storage_buffers
|
|
{
|
|
warn!("Cluster light index lists is full! The PointLights in the view are affecting too many clusters.");
|
|
indices_full = true;
|
|
break;
|
|
}
|
|
view_clusters_bindings.push_index(*light_index);
|
|
}
|
|
}
|
|
}
|
|
|
|
cluster_index += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
view_clusters_bindings.write_buffers(render_device, &render_queue);
|
|
|
|
commands.get_or_spawn(entity).insert(view_clusters_bindings);
|
|
}
|
|
}
|
|
|
|
pub fn queue_shadow_view_bind_group(
|
|
render_device: Res<RenderDevice>,
|
|
shadow_pipeline: Res<ShadowPipeline>,
|
|
mut light_meta: ResMut<LightMeta>,
|
|
view_uniforms: Res<ViewUniforms>,
|
|
) {
|
|
if let Some(view_binding) = view_uniforms.uniforms.binding() {
|
|
light_meta.shadow_view_bind_group =
|
|
Some(render_device.create_bind_group(&BindGroupDescriptor {
|
|
entries: &[BindGroupEntry {
|
|
binding: 0,
|
|
resource: view_binding,
|
|
}],
|
|
label: Some("shadow_view_bind_group"),
|
|
layout: &shadow_pipeline.view_layout,
|
|
}));
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::too_many_arguments)]
|
|
pub fn queue_shadows(
|
|
shadow_draw_functions: Res<DrawFunctions<Shadow>>,
|
|
shadow_pipeline: Res<ShadowPipeline>,
|
|
casting_meshes: Query<&Handle<Mesh>, Without<NotShadowCaster>>,
|
|
render_meshes: Res<RenderAssets<Mesh>>,
|
|
mut pipelines: ResMut<SpecializedMeshPipelines<ShadowPipeline>>,
|
|
mut pipeline_cache: ResMut<PipelineCache>,
|
|
view_lights: Query<&ViewLightEntities>,
|
|
mut view_light_shadow_phases: Query<(&LightEntity, &mut RenderPhase<Shadow>)>,
|
|
point_light_entities: Query<&CubemapVisibleEntities, With<ExtractedPointLight>>,
|
|
directional_light_entities: Query<&VisibleEntities, With<ExtractedDirectionalLight>>,
|
|
spot_light_entities: Query<&VisibleEntities, With<ExtractedPointLight>>,
|
|
) {
|
|
for view_lights in &view_lights {
|
|
let draw_shadow_mesh = shadow_draw_functions
|
|
.read()
|
|
.get_id::<DrawShadowMesh>()
|
|
.unwrap();
|
|
for view_light_entity in view_lights.lights.iter().copied() {
|
|
let (light_entity, mut shadow_phase) =
|
|
view_light_shadow_phases.get_mut(view_light_entity).unwrap();
|
|
let visible_entities = match light_entity {
|
|
LightEntity::Directional { light_entity } => directional_light_entities
|
|
.get(*light_entity)
|
|
.expect("Failed to get directional light visible entities"),
|
|
LightEntity::Point {
|
|
light_entity,
|
|
face_index,
|
|
} => point_light_entities
|
|
.get(*light_entity)
|
|
.expect("Failed to get point light visible entities")
|
|
.get(*face_index),
|
|
LightEntity::Spot { light_entity } => spot_light_entities
|
|
.get(*light_entity)
|
|
.expect("Failed to get spot light visible entities"),
|
|
};
|
|
// NOTE: Lights with shadow mapping disabled will have no visible entities
|
|
// so no meshes will be queued
|
|
for entity in visible_entities.iter().copied() {
|
|
if let Ok(mesh_handle) = casting_meshes.get(entity) {
|
|
if let Some(mesh) = render_meshes.get(mesh_handle) {
|
|
let key =
|
|
ShadowPipelineKey::from_primitive_topology(mesh.primitive_topology);
|
|
let pipeline_id = pipelines.specialize(
|
|
&mut pipeline_cache,
|
|
&shadow_pipeline,
|
|
key,
|
|
&mesh.layout,
|
|
);
|
|
|
|
let pipeline_id = match pipeline_id {
|
|
Ok(id) => id,
|
|
Err(err) => {
|
|
error!("{}", err);
|
|
continue;
|
|
}
|
|
};
|
|
|
|
shadow_phase.add(Shadow {
|
|
draw_function: draw_shadow_mesh,
|
|
pipeline: pipeline_id,
|
|
entity,
|
|
distance: 0.0, // TODO: sort back-to-front
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct Shadow {
|
|
pub distance: f32,
|
|
pub entity: Entity,
|
|
pub pipeline: CachedRenderPipelineId,
|
|
pub draw_function: DrawFunctionId,
|
|
}
|
|
|
|
impl PhaseItem for Shadow {
|
|
type SortKey = FloatOrd;
|
|
|
|
#[inline]
|
|
fn sort_key(&self) -> Self::SortKey {
|
|
FloatOrd(self.distance)
|
|
}
|
|
|
|
#[inline]
|
|
fn draw_function(&self) -> DrawFunctionId {
|
|
self.draw_function
|
|
}
|
|
|
|
#[inline]
|
|
fn sort(items: &mut [Self]) {
|
|
radsort::sort_by_key(items, |item| item.distance);
|
|
}
|
|
}
|
|
|
|
impl EntityPhaseItem for Shadow {
|
|
fn entity(&self) -> Entity {
|
|
self.entity
|
|
}
|
|
}
|
|
|
|
impl CachedRenderPipelinePhaseItem for Shadow {
|
|
#[inline]
|
|
fn cached_pipeline(&self) -> CachedRenderPipelineId {
|
|
self.pipeline
|
|
}
|
|
}
|
|
|
|
pub struct ShadowPassNode {
|
|
main_view_query: QueryState<&'static ViewLightEntities>,
|
|
view_light_query: QueryState<(&'static ShadowView, &'static RenderPhase<Shadow>)>,
|
|
}
|
|
|
|
impl ShadowPassNode {
|
|
pub const IN_VIEW: &'static str = "view";
|
|
|
|
pub fn new(world: &mut World) -> Self {
|
|
Self {
|
|
main_view_query: QueryState::new(world),
|
|
view_light_query: QueryState::new(world),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Node for ShadowPassNode {
|
|
fn input(&self) -> Vec<SlotInfo> {
|
|
vec![SlotInfo::new(ShadowPassNode::IN_VIEW, SlotType::Entity)]
|
|
}
|
|
|
|
fn update(&mut self, world: &mut World) {
|
|
self.main_view_query.update_archetypes(world);
|
|
self.view_light_query.update_archetypes(world);
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
graph: &mut RenderGraphContext,
|
|
render_context: &mut RenderContext,
|
|
world: &World,
|
|
) -> Result<(), NodeRunError> {
|
|
let view_entity = graph.get_input_entity(Self::IN_VIEW)?;
|
|
if let Ok(view_lights) = self.main_view_query.get_manual(world, view_entity) {
|
|
for view_light_entity in view_lights.lights.iter().copied() {
|
|
let (view_light, shadow_phase) = self
|
|
.view_light_query
|
|
.get_manual(world, view_light_entity)
|
|
.unwrap();
|
|
|
|
if shadow_phase.items.is_empty() {
|
|
continue;
|
|
}
|
|
|
|
let pass_descriptor = RenderPassDescriptor {
|
|
label: Some(&view_light.pass_name),
|
|
color_attachments: &[],
|
|
depth_stencil_attachment: Some(RenderPassDepthStencilAttachment {
|
|
view: &view_light.depth_texture_view,
|
|
depth_ops: Some(Operations {
|
|
load: LoadOp::Clear(0.0),
|
|
store: true,
|
|
}),
|
|
stencil_ops: None,
|
|
}),
|
|
};
|
|
|
|
let draw_functions = world.resource::<DrawFunctions<Shadow>>();
|
|
let render_pass = render_context
|
|
.command_encoder
|
|
.begin_render_pass(&pass_descriptor);
|
|
let mut draw_functions = draw_functions.write();
|
|
let mut tracked_pass = TrackedRenderPass::new(render_pass);
|
|
for item in &shadow_phase.items {
|
|
let draw_function = draw_functions.get_mut(item.draw_function).unwrap();
|
|
draw_function.draw(world, &mut tracked_pass, view_light_entity, item);
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub type DrawShadowMesh = (
|
|
SetItemPipeline,
|
|
SetShadowViewBindGroup<0>,
|
|
SetMeshBindGroup<1>,
|
|
DrawMesh,
|
|
);
|
|
|
|
pub struct SetShadowViewBindGroup<const I: usize>;
|
|
impl<const I: usize> EntityRenderCommand for SetShadowViewBindGroup<I> {
|
|
type Param = (SRes<LightMeta>, SQuery<Read<ViewUniformOffset>>);
|
|
#[inline]
|
|
fn render<'w>(
|
|
view: Entity,
|
|
_item: Entity,
|
|
(light_meta, view_query): SystemParamItem<'w, '_, Self::Param>,
|
|
pass: &mut TrackedRenderPass<'w>,
|
|
) -> RenderCommandResult {
|
|
let view_uniform_offset = view_query.get(view).unwrap();
|
|
pass.set_bind_group(
|
|
I,
|
|
light_meta
|
|
.into_inner()
|
|
.shadow_view_bind_group
|
|
.as_ref()
|
|
.unwrap(),
|
|
&[view_uniform_offset.offset],
|
|
);
|
|
|
|
RenderCommandResult::Success
|
|
}
|
|
}
|