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bevy/examples/3d
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Patrick Walton 0ede857103
Build batches across phases in parallel. (#17764) 
Currently, invocations of `batch_and_prepare_binned_render_phase` and
`batch_and_prepare_sorted_render_phase` can't run in parallel because
they write to scene-global GPU buffers. After PR #17698,
`batch_and_prepare_binned_render_phase` started accounting for the
lion's share of the CPU time, causing us to be strongly CPU bound on
scenes like Caldera when occlusion culling was on (because of the
overhead of batching for the Z-prepass). Although I eventually plan to
optimize `batch_and_prepare_binned_render_phase`, we can obtain
significant wins now by parallelizing that system across phases.

This commit splits all GPU buffers that
`batch_and_prepare_binned_render_phase` and
`batch_and_prepare_sorted_render_phase` touches into separate buffers
for each phase so that the scheduler will run those phases in parallel.
At the end of batch preparation, we gather the render phases up into a
single resource with a new *collection* phase. Because we already run
mesh preprocessing separately for each phase in order to make occlusion
culling work, this is actually a cleaner separation. For example, mesh
output indices (the unique ID that identifies each mesh instance on GPU)
are now guaranteed to be sequential starting from 0, which will simplify
the forthcoming work to remove them in favor of the compute dispatch ID.

On Caldera, this brings the frame time down to approximately 9.1 ms with
occlusion culling on.

![Screenshot 2025-02-08
210720](https://github.com/user-attachments/assets/44bed500-e323-4786-b40c-828b75bc7d3f)
2025-02-13 00:02:20 +00:00
..
3d_scene.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
3d_shapes.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
3d_viewport_to_world.rs Fix window close in example cause panic (#17533) 2025-01-28 05:37:23 +00:00
animated_material.rs aligning public apis of Time,Timer and Stopwatch (#15962) 2024-10-16 21:09:32 +00:00
anisotropy.rs Add a Sphere to anisotropy example (#17676) 2025-02-05 20:23:43 +00:00
anti_aliasing.rs Don't reëxport bevy_image from bevy_render (#16163) 2024-11-10 06:54:38 +00:00
atmosphere.rs Procedural atmospheric scattering (#16314) 2025-01-23 22:52:46 +00:00
atmospheric_fog.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
auto_exposure.rs Introduce support for mixed lighting by allowing lights to opt out of contributing diffuse light to lightmapped objects. (#16761) 2024-12-16 23:48:33 +00:00
blend_modes.rs Allow clippy::too_many_arguments to lint without warnings (#17249) 2025-01-09 07:26:15 +00:00
bloom_3d.rs Anamorphic Bloom (#17096) 2025-01-06 18:43:21 +00:00
camera_sub_view.rs simplify example, replace get_single to Single Query (#16187) 2024-11-01 18:25:42 +00:00
clearcoat.rs Don't reëxport bevy_image from bevy_render (#16163) 2024-11-10 06:54:38 +00:00
clustered_decals.rs Disable clustered decals on Metal. (#17554) 2025-01-27 05:39:07 +00:00
color_grading.rs Relationships (non-fragmenting, one-to-many) (#17398) 2025-01-18 22:20:30 +00:00
decal.rs Forward decals (port of bevy_contact_projective_decals) (#16600) 2025-01-15 02:31:30 +00:00
deferred_rendering.rs Allow clippy::too_many_arguments to lint without warnings (#17249) 2025-01-09 07:26:15 +00:00
depth_of_field.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
edit_material_on_gltf.rs Add edit_material_on_gltf example (#17677) 2025-02-05 22:45:20 +00:00
fog_volumes.rs Deprecate SpatialBundle (#15830) 2024-10-13 17:28:22 +00:00
fog.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
generate_custom_mesh.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
irradiance_volumes.rs Introduce support for mixed lighting by allowing lights to opt out of contributing diffuse light to lightmapped objects. (#16761) 2024-12-16 23:48:33 +00:00
lighting.rs Improved Spawn APIs and Bundle Effects (#17521) 2025-02-09 23:32:56 +00:00
lightmaps.rs Higher quality bicubic lightmap sampling (#16740) 2025-01-12 05:40:30 +00:00
lines.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
load_gltf_extras.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
load_gltf.rs aligning public apis of Time,Timer and Stopwatch (#15962) 2024-10-16 21:09:32 +00:00
mesh_ray_cast.rs Rename RayCastSettings to MeshRayCastSettings (#16703) 2024-12-10 03:27:42 +00:00
meshlet.rs Add external assets to .gitignore (#17388) 2025-01-17 01:20:14 +00:00
mixed_lighting.rs Parent -> ChildOf (#17427) 2025-01-20 22:13:29 +00:00
motion_blur.rs Improved Spawn APIs and Bundle Effects (#17521) 2025-02-09 23:32:56 +00:00
occlusion_culling.rs Build batches across phases in parallel. (#17764) 2025-02-13 00:02:20 +00:00
order_independent_transparency.rs Relationships (non-fragmenting, one-to-many) (#17398) 2025-01-18 22:20:30 +00:00
orthographic.rs Improve API for scaling orthographic cameras (#15969) 2024-10-17 17:50:06 +00:00
parallax_mapping.rs Don't reëxport bevy_image from bevy_render (#16163) 2024-11-10 06:54:38 +00:00
parenting.rs aligning public apis of Time,Timer and Stopwatch (#15962) 2024-10-16 21:09:32 +00:00
pbr.rs Fix confusing comment in pbr example (#16996) 2024-12-29 22:45:17 +00:00
pcss.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
post_processing.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
query_gltf_primitives.rs Cosmetic tweaks to query_gltf_primitives (#16102) 2024-10-27 19:06:19 +00:00
reflection_probes.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
render_to_texture.rs aligning public apis of Time,Timer and Stopwatch (#15962) 2024-10-16 21:09:32 +00:00
rotate_environment_map.rs Don't reëxport bevy_image from bevy_render (#16163) 2024-11-10 06:54:38 +00:00
scrolling_fog.rs Don't reëxport bevy_image from bevy_render (#16163) 2024-11-10 06:54:38 +00:00
shadow_biases.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
shadow_caster_receiver.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
skybox.rs Introduce support for mixed lighting by allowing lights to opt out of contributing diffuse light to lightmapped objects. (#16761) 2024-12-16 23:48:33 +00:00
specular_tint.rs Add support for specular tints and maps per the KHR_materials_specular glTF extension. (#14069) 2025-01-26 20:38:46 +00:00
spherical_area_lights.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
split_screen.rs Store UI render target info locally per node (#17579) 2025-02-10 07:27:58 +00:00
spotlight.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
ssao.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
ssr.rs Allow clippy::too_many_arguments to lint without warnings (#17249) 2025-01-09 07:26:15 +00:00
texture.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
tonemapping.rs Move hashbrown and foldhash out of bevy_utils (#17460) 2025-01-23 16:46:08 +00:00
transmission.rs Allow clippy::too_many_arguments to lint without warnings (#17249) 2025-01-09 07:26:15 +00:00
transparency_3d.rs aligning public apis of Time,Timer and Stopwatch (#15962) 2024-10-16 21:09:32 +00:00
two_passes.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
update_gltf_scene.rs aligning public apis of Time,Timer and Stopwatch (#15962) 2024-10-16 21:09:32 +00:00
vertex_colors.rs Migrate cameras to required components (#15641) 2024-10-05 01:59:52 +00:00
visibility_range.rs Parent -> ChildOf (#17427) 2025-01-20 22:13:29 +00:00
volumetric_fog.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00
wireframe.rs Merge Style properties into Node. Use ComputedNode for computed properties. (#15975) 2024-10-18 22:25:33 +00:00