Commit Graph

140 Commits

Author SHA1 Message Date
Hugo Locurcio
4b42379c8f
Rename RenderingServer global shader uniform methods to be more explicit
The `global_shader_uniform` name is longer, but it makes it much
easier to find the methods when searching in the class reference.
2022-07-28 18:46:59 +02:00
Hugo Locurcio
e24029edc3
Allow changing mipmap LOD bias when FSR 1.0 scaling is not used
Mipmap LOD bias can be useful to improve the appearance of distant
textures without increasing anisotropic filtering (or in situations
where anisotropic filtering is not effective).

`fsr_mipmap_bias` was renamed to `texture_mipmap_bias` accordingly.
The property hint now allows for greater precision as well.
2022-07-28 17:51:13 +02:00
Rémi Verschelde
90019676b0 Code quality: Fix header guards consistency
Adds `header_guards.sh` bash script, used in CI to validate future
changes. Can be run locally to fix invalid header guards.
2022-07-25 11:17:40 +02:00
reduz
f649678402 Clean up Shader Preprocessor
* Moved preprocessor to Shader and ShaderInclude
* Clean up RenderingServer side
* Preprocessor is separate from parser now, but it emits tokens with include location hints.
* Improved ShaderEditor validation code
* Added include file code completion
* Added notification for all files affected by a broken include.
2022-07-22 22:53:03 +02:00
Bastiaan Olij
d139131aab Adding Variable Rate Shading support to Godot
Improve GI renderer and add VRS support
Implement render device has_feature and move subgroup settings to limit_get
2022-07-17 15:42:24 +10:00
Hugo Locurcio
21ea1c3835
Rename soft shadow quality project settings for easier searching
`rendering/quality/shadows` is now `rendering/quality/positional_shadow`
to explicitly denote that the settings only affect positional light shadows,
not directional light shadows.

Shadow atlas settings now contain the word "atlas" for easier searching.

Soft shadow quality settings were renamed to contain the word "filter".
This makes the settings appear when searching for "filter" in the
project settings dialog, like in Godot 3.x.
2022-07-13 19:56:02 +02:00
lawnjelly
1f69666209 Remove Octree
Octree is no longer used in 4.x.
2022-07-06 14:10:05 +01:00
Bastiaan Olij
ecfcfd97fa Split dependency logic
Split FOG
Split visibility notifier
Final cleanup of storage classes
2022-06-28 00:10:29 +10:00
Rémi Verschelde
051fb86fb0
Merge pull request #61221 from BastiaanOlij/split_gi_effects 2022-06-23 12:28:10 +02:00
Rémi Verschelde
d8ef904ffc
Merge pull request #35758 from zmanuel/eliminate-draw-pending
Remove redundant thread sync counter draw_pending
2022-06-22 18:20:41 +02:00
Bastiaan Olij
997810e417 Split GI effects and fix stereoscopic rendering of GI effects 2022-06-22 12:50:17 +10:00
reduz
5786516d4d Implement Running Godot as Movie Writer
* Allows running the game in "movie writer" mode.
* It ensures entirely stable framerate, so your run can be saved stable and with proper sound (which is impossible if your CPU/GPU can't sustain doing this in real-time).
* If disabling vsync, it can save movies faster than the game is run, but if you want to control the interaction it can get difficult.
* Implements a simple, default MJPEG writer.

This new features has two main use cases, which have high demand:
* Saving game videos in high quality and ensuring the frame rate is *completely* stable, always.
* Using Godot as a tool to make movies and animations (which is ideal if you want interaction, or creating them procedurally. No other software is as good for this).

**Note**: This feature **IS NOT** for capturing real-time footage. Use something like OBS, SimpleScreenRecorder or FRAPS to achieve that, as they do a much better job at intercepting the compositor than Godot can probably do using Vulkan or OpenGL natively. If your game runs near real-time when capturing, you can still use this feature but it will play no sound (sound will be saved directly).

Usage:

$ godot --write-movie movie.avi [scene_file.tscn]

Missing:

* Options for configuring video writing via GLOBAL_DEF
* UI Menu for launching with this mode from the editor.
* Add to list of command line options.
* Add a feature tag to override configurations when movie writing (fantastic for saving videos with highest quality settings).
2022-06-21 11:28:47 +02:00
jfons
ba832d83b2 Initial TAA implementation
Initial TAA support based on the implementation in Spartan Engine.

Motion vectors are correctly generated for camera and mesh movement, but there is no support for other things like particles or skeleton deformations.
2022-06-07 13:14:44 +02:00
Rémi Verschelde
ff30a09993
Merge pull request #60643 from clayjohn/GLES3-3D 2022-05-12 21:08:02 +02:00
reduz
8b7c7f5a75 Add a new HashMap implementation
Adds a new, cleaned up, HashMap implementation.

* Uses Robin Hood Hashing (https://en.wikipedia.org/wiki/Hash_table#Robin_Hood_hashing).
* Keeps elements in a double linked list for simpler, ordered, iteration.
* Allows keeping iterators for later use in removal (Unlike Map<>, it does not do much
  for performance vs keeping the key, but helps replace old code).
* Uses a more modern C++ iterator API, deprecates the old one.
* Supports custom allocator (in case there is a wish to use a paged one).

This class aims to unify all the associative template usage and replace it by this one:
* Map<> (whereas key order does not matter, which is 99% of cases)
* HashMap<>
* OrderedHashMap<>
* OAHashMap<>
2022-05-12 11:21:29 +02:00
clayjohn
3bb8e6a9fe SkyShaders working 2022-05-11 21:00:21 -07:00
Hugo Locurcio
31194f5b1c
Add get_video_adapter_api_version() to RenderingServer
This method can be used to get the graphics API version currently in
use (such as Vulkan). It can be used by projects for troubleshooting
or statistical purposes.
2022-05-03 01:18:35 +02:00
Bastiaan Olij
0b4fd92a17 Moved particles into ParticlesStorage 2022-04-17 13:13:22 +10:00
Bastiaan Olij
b6faf6c6c0 Move light, reflection probe and lightmap into LightStorage 2022-04-17 13:13:18 +10:00
Bastiaan Olij
6b28d94e77 Merge canvas and decal into TextureStorage and add render target 2022-04-17 12:59:50 +10:00
Yuri Roubinsky
6e9535a9c8 Restore antialiasing for draw_line 2022-04-12 13:03:56 +03:00
Bastiaan Olij
b8be7903f3 Move storage for Mesh, MeshInstance, MultiMesh and Skeleton into MeshStorage 2022-04-02 16:29:04 +11:00
Bastiaan Olij
36defd1179 Extract global variable, shader and material storage 2022-03-31 21:49:42 +11:00
Bastiaan Olij
0fe06e9467 Extract Decal and Decal atlas from Storage class 2022-03-21 12:22:43 +11:00
Hugo Locurcio
c45d2c242b Replace DirectionalLight3D's use_in_sky_only with sky_mode enum
3 options are available:

- Light and Sky (default)
- Light Only (new)
- Sky Only (equivalent to `use_in_sky_only = true`)

Co-authored by: clayjohn <claynjohn@gmail.com>
2022-03-17 14:00:02 -07:00
Bastiaan Olij
57e5a33623 Split dummy renderer classes into separate files
Split canvas_texture_storage and texture_storage from render_storage class
2022-03-16 17:43:10 +11:00
Hugo Locurcio
aea104deb7
Remove unused shadow_color property from Light3D
This shadow color property was no longer effective since the shaders
were optimized to improve occupancy.
2022-03-04 23:12:18 +01:00
Hugo Locurcio
b1a295b739
Implement distance fade properties in OmniLight3D and SpotLight3D
This can be used to fade lights and their shadows in the distance,
similar to Decal nodes. This can bring significant performance
improvements, especially for lights with shadows enabled and when
using higher-than-default shadow quality settings.

While lights can be smoothly faded out over distance, shadows are
currently "all or nothing" since per-light shadow color is no longer
customizable in the Vulkan renderer. This may result in noticeable
pop-in when leaving the shadow cutoff distance, but depending on the
scene, it may not always be that noticeable.
2022-02-25 15:17:35 +01:00
Rémi Verschelde
58324f4df8
Merge pull request #54574 from Ansraer/glow_map 2022-01-26 13:39:51 +01:00
Rémi Verschelde
9b9440165b
Merge pull request #54890 from briansemrau/threadsafe-drawpute-lists
Make draw/compute lists threadsafe
2022-01-22 20:20:07 +01:00
Ansraer
90652b1755 add support for glow maps 2022-01-20 16:47:25 +01:00
Rémi Verschelde
cba2fd2e80
Revert "Add new scaling modes for splash screen"
This reverts commit fcc9f5ce39.

The feature is good but the implementation still needs more work.
A new PR will be made with a rework of this commit.
2022-01-19 16:09:52 +01:00
Samuel Pedrajas
fcc9f5ce39
Add new scaling modes for splash screen
Removes the `fullsize` option which is superseded by `stretch_mode`.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>
2022-01-18 23:29:11 +01:00
Hugo Locurcio
2dc7b03a82
Allow using between 1 and 8 cascades for SDFGI
This provides more flexibility between performance and quality
adjustments, especially when using SDFGI for small-scale levels
(which can be useful for procedurally generated scenes).
2022-01-17 16:49:02 +01:00
Fernando Cosentino
ca79373d13
Added material_overlay property to MeshInstance3D
Applying overlay materials into multi-surface meshes currently
requires adding a next pass material to all the surfaces, which
might be cumbersome when the material is to be applied to a range
of different geometries. This also makes it not trivial to use
AnimationPlayer to control the material in case of visual effects.
The material_override property is not an option as it works
replacing the active material for the surfaces, not adding a new pass.

This commit adds the material_overlay property to GeometryInstance3D
(and therefore MeshInstance3D), having the same reach as
material_override (that is, all surfaces) but adding a new material
pass on top of the active materials, instead of replacing them.
2022-01-05 11:47:51 +01:00
Rémi Verschelde
095c72b03e
Merge pull request #55790 from Calinou/renderingserver-add-device-type-getter
Add `RenderingServer.get_video_adapter_type()` method
2022-01-04 16:43:23 +01:00
Rémi Verschelde
851fb16350
Merge pull request #56305 from Calinou/rename-lod-threshold 2022-01-04 15:28:06 +01:00
Rémi Verschelde
7f66c16c03
Merge pull request #51206 from clayjohn/Vulkan-ASSGI 2022-01-04 10:00:17 +01:00
Rémi Verschelde
fe52458154
Update copyright statements to 2022
Happy new year to the wonderful Godot community!
2022-01-03 21:27:34 +01:00
Hugo Locurcio
df09bc38cb
Rename Lod Threshold to Mesh Lod Threshold
This makes it more obvious that the setting only affects mesh LOD,
not manual (H)LOD achieved using visibility ranges.
2021-12-29 00:11:50 +01:00
Hugo Locurcio
b3174e7af9
Add RenderingServer.get_video_adapter_type() method
This can be used to distinguish between integrated, dedicated, virtual
and software-emulated GPUs. This in turn can be used to automatically
adjust graphics settings, or warn users about features that may run
slowly on their hardware.
2021-12-10 17:10:47 +01:00
Je06jm
20deb0917d Implemented AMD's FSR as a computer shader for upscaling 3D scenes 2021-11-23 14:16:03 -07:00
Yuri Roubinsky
826e781bfa Fix default_texture_param in shader pipeline to support uniform arrays 2021-11-12 12:53:40 +03:00
Brian Semrau
f123a79170 Make draw/compute lists threadsafe
Lock the rendering device while command buffers are in use
2021-11-11 13:55:09 -05:00
clayjohn
0eff109a21 Added SSIL post processing effect 2021-11-06 12:43:19 -07:00
Brian Semrau
ac24070056 Use Callable in RS::request_frame_drawn_callback 2021-11-05 01:59:38 -04:00
clayjohn
1b2cd9f251 Addition of FogVolumes, FogShaders, FogMaterial, and overhaul of VolumetricFog
Co-authored-by: Brian Semrau <brian.semrau@gmail.com>
2021-10-28 22:02:23 -07:00
JFonS
c571e4a7f4 Implement distance fade and transparency
The built-in ALPHA in spatial shaders comes pre-set with a per-instance
transparency value. Multiply by it if you want to keep it.

The transparency value of any given GeometryInstance3D is affected by:
   - Its new "transparency" property.
   - Its own visiblity range when the new "visibility_range_fade_mode"
     property is set to "Self".
   - Its parent visibility range when the parent's fade mode is
     set to "Dependencies".

The "Self" mode will fade-out the instance when reaching the visibility
range limits, while the "Dependencies" mode will fade-in its
dependencies.

Per-instance transparency is only implemented in the forward clustered
renderer, support for mobile should be added in the future.

Co-authored-by: reduz <reduzio@gmail.com>
2021-10-25 11:39:34 +02:00
Hugo Locurcio
73c6e19acc
Allow any floating-point value as a 3D rendering scale option
This allows for finer control over 3D rendering resolution.
Supersampling can also be performed by setting a 3D rendering
resolution above 1.0, which is useful for offline rendering or
for very high-end GPUs.
2021-10-08 18:22:10 +02:00
Hugo Locurcio
265bae824f
Remove unimplemented Environment.ambient_light_occlusion_color property
This property was intended to provide a way to have SSAO or VoxelGI
ambient occlusion with a color other than black. However, it was
dropped during the Vulkan renderer development due to the performance
overhead it caused when the feature wasn't used.
2021-10-07 17:47:52 +02:00
bruvzg
4c3f7d1290 Makes FontData importable resource.
Adds multi-channel SDF font texture generation and rendering support.
Adds per-font oversampling support.
Adds FontData import plugins (for dynamic fonts, BMFonts and monospaced image fonts), font texture cache pre-generation and loading.
Adds BMFont binary format and outline support.
2021-08-27 15:43:18 +03:00
Bastiaan Olij
64626cc435 Optionally scale 3D render content 2021-08-26 20:48:40 +10:00
Aaron Franke
03e2544d50
Use real_t and double where appropriate in Particles 2021-08-12 11:35:31 -05:00
Aaron Franke
84f720966c
Use doubles for time in many other places 2021-08-09 14:05:42 -05:00
reduz
9293bc3935 Implement more rendering options as specialization constants
* Shadow quality settings now specialization constant.
* Decal and light projector filters can be set.
* Changing those settings forces re-creation of the pipelines.

These changes should help improve performance related to shadow mapping, and allows improving performance by sacrificing decal and light projector quality.
2021-07-19 21:51:29 -03:00
Hendrik Brucker
043ae91560 Restructure and reimplement vsync options
-Add a v-sync mode setting which allows to choose between DISABLED, ON, ADAPTIVE and MAILBOX
-Removed the V-Sync via Compositor option
2021-07-06 16:34:26 +02:00
reduz
6c55d2aad2 Fix Render Info
* Fixed and redone the process to obtain render information from a viewport
* Some stats, such as material changes are too difficult to guess on Vulkan, were removed.
* Separated visible and shadow stats, which causes confusion.
* Texture, buffer and general video memory can be queried now.
* Fixed the performance metrics too.
2021-07-03 10:15:04 -03:00
Hugo Locurcio
5370f4876e
Remove leftovers from the DirectionalLight3D Optimized shadow depth range
The Optimized shadow depth range was removed in late 2020 in favor
of the Stable shadow depth range, but it still had a (broken) property
that allowed to enable it.
2021-07-02 20:32:43 +02:00
reduz
37776b2867 Clean up RenderingServer and its bindings
* Rewrote bindings for RenderingServer.
* They are now all up to date.
* Several unused methods and deprecated features were cleaned up.
2021-07-01 09:07:36 -03:00
reduz
85cf99f28e Deprecate ImmediateGeometry
* Removed entirely from RenderingServer.
* Replaced by ImmediateMesh resource.
* ImmediateMesh replaces ImmediateGeometry, but could use more optimization in the future.
* Sprite3D and AnimatedSprite3D work again, ported from Godot 3.x (though a lot of work was needed to adapt them to Godot 4).
* RootMotionView works again.
* Polygon3D editor works again.
2021-06-30 14:14:41 -03:00
reduz
d07f7c8d25 Fixes to 2D viewport
* Editor 2D viewport now uses embedded subwindows (windows no longer pop up)
* Restored the ability to disable 3D on the 2D viewport (makes 3D not display on 2D when there is a camera on the scene)
2021-06-29 17:40:45 -03:00
reduz
94d31ac327 Implement animation slice drawing in CanvasItem
* Added a function to ignore subsequent commands if they don't fall within the slice.
* This will be used by the new TileMap to properly provide animated tiles.
2021-06-17 12:42:27 -03:00
reduz
6e98c4cd50 Refactor VisibilityNotifier3D
* This is the 3D counterpart to #49632
* Implemented a bit different as 3D works using instancing

After merged, both 2D and 3D classes will most likely be renamed in a separate PR to DisplayNotifier2D/3D.
2021-06-16 18:50:39 -03:00
reduz
38d164c74b Refactor VisibilityNotifier
* Works from RenderinServer
* Accurately tells when on or off-scren, its no longer approximate.
* VisibilityEnabler also simplified to use the process mode instead.
2021-06-16 10:48:57 -03:00
jfons
3a53ae5d9f Implement visibility range and dependencies.
This commit adds the following properties to GeometryInstance3D: `visibility_range_begin`,
`visibility_range_begin_margin`, `visibility_range_end`, `visibility_range_end_margin`.

Together they define a range in which the GeometryInstance3D will be visible from the camera,
taking hysteresis into account for state changes. A begin or end value of 0 will be ignored,
so the visibility range can be open-ended in both directions.

This commit also adds the `visibility_parent` property to 'Node3D'.
Which defines the visibility parents of the node and its subtree (until
another parent is defined).

Visual instances with a visibility parent will only be visible when the parent, and all of its
ancestors recursively, are hidden because they are closer to the camera than their respective
`visibility_range_begin` thresholds.

Combining visibility ranges and visibility parents users can set-up a quick HLOD system
that shows high detail meshes when close (i.e buildings, trees) and merged low detail meshes
for far away groups (i.e. cities, woods).
2021-06-14 12:17:11 +02:00
reduz
32625145c8 Rename GI Classes
* GIProbe is now VoxelGI
* BakedLightmap is now LightmapGI

As godot adds more ways to provide GI (as an example, SDFGI in 4.0), the different techniques (which have different pros/cons) need to be properly named to avoid confusion.
2021-06-05 09:28:56 -03:00
Aaron Franke
de3f6699a5
Rename Transform to Transform3D in core 2021-06-03 07:30:01 -04:00
reduz
479391ef54 Fixes missng 2D engine bits
-Mesh2D now works
-MultiMesh2D now works
-Polygon2D now works
-Added hooks for processing 2D particles
-Skeleton2D now works

2D particles still not working, but stuff needed for it is now implemented.
2021-05-11 11:21:36 -03:00
reduz
90056460ad Implement Particle Trails
-Enable the trails and set the length in seconds
-Provide a mesh with a skeleton and a skin
-Or, alternatively use one of the built-in TubeTrailMesh/RibbonTrailMesh
-Works deterministically
-Fixed particle collisions (were broken)
-Not working in 2D yet (that will happen next)
2021-04-30 17:38:02 -03:00
jfons
4d9d99bb82 Implement occlusion culling
Added an occlusion culling system with support for static occluder meshes.
It can be enabled via `Project Settings > Rendering > Occlusion Culling > Use Occlusion Culling`.

Occluders are defined via the new `Occluder3D` resource and instanced using the new
`OccluderInstance3D` node. The occluders can also be automatically baked from a
scene using the built-in editor plugin.
2021-04-23 21:45:23 +02:00
clayjohn
92731d292c Rename get_surface_material to get_surface_override_material 2021-04-14 20:24:03 -07:00
Manuel Moos
fc7333433b Remove redundant thread sync counter draw_pending
The functions that used it already use a threadsafe FIFO queue
to communicate between threads and a sync to have the main thread
wait for the render thread.

Fixes #35718
2021-03-21 14:45:38 +01:00
sboronczyk
3e7c5d2ca5 fix issue vulkan crash on open shader materials 2021-03-13 22:54:33 +01:00
Ev1lbl0w
1f0b60c47d
Fix negative VRAM values 2021-03-05 21:48:20 +00:00
Pedro J. Estébanez
8e128726f0 Modernize atomics
- Based on C++11's `atomic`
- Reworked `SafeRefCount` (based on the rewrite by @hpvb)
- Replaced free atomic functions by the new `SafeNumeric<T>`
- Replaced wrong cases of `volatile bool` by the new `SafeFlag`
- Platform-specific implementations no longer needed

Co-authored-by: Hein-Pieter van Braam-Stewart <hp@tmm.cx>
2021-02-18 17:12:46 +01:00
reduz
8b19ffd810 Make Servers truly Thread Safe
-Rendering server now uses a split RID allocate/initialize internally, this allows generating RIDs immediately but initialization to happen later on the proper thread (as rendering APIs generally requiere to call on the right thread).
-RenderingServerWrapMT is no more, multithreading is done in RenderingServerDefault.
-Some functions like texture or mesh creation, when renderer supports it, can register and return immediately (so no waiting for server API to flush, and saving staging and command buffer memory).
-3D physics server changed to be made multithread friendly.
-Added PhysicsServer3DWrapMT to use 3D physics server from multiple threads.
-Disablet Bullet (too much effort to make multithread friendly, this needs to be fixed eventually).
2021-02-10 13:21:46 -03:00
reduz
3e2281a347 Improve SDFGI indirect light feedback loop
-Use occlusion for feedback, further reduces light leaking.
-More control on feedback, now its a slider.
2021-02-07 21:30:12 -03:00
reduz
8faf23b52b Simplify Volumetric Fog
-Always use temporal reproject, it just loos way better than any other filter.
-By always using termporal reproject, the shadowmap reduction can be done away with, massively improving performance.
-Disadvantage of temporal reproject is update latency so..
-Made sure a gaussian filter runs in XY after fog, this allows to keep stability and lower latency.
2021-02-06 15:08:21 -03:00
reduz
7997544af5 Added temporal reprojection to Volumetric Fog
-It's an option, just enable it
-Just works, don't have to do anything else.
2021-02-05 10:52:54 -03:00
reduz
51d8e32c93 Implement shadow meshes
-When importing, a vertex-only version of the mesh is created.
-This version is used when rendering shadows, and improves performance by reducing bandwidth
-It's automatic, but can optionally be used by users, in case they want to make special versions of geometry for shadow casting.
2021-01-25 15:03:15 -03:00
reduz
a9beb7aa8c Shadow map rendering optimization
-All shadow rendering is done with raster now (no compute)
-All shadow rendering is done by rendering directly to the shadow atlas
-Improved how buffer clearing is done to optimize the above.
-Ability to set shadows as 16 bits.
2021-01-24 20:17:28 -03:00
reduz
6fe342478b Several GI related optimizations and fixes
-SDFGI direct light is done over many frames
-SDFGI Changed settings for rays/frame
-SDFGI Misc optimizations
-SDFGI Bug fix on probe scroll

-GIProbe was not working, got it to work again
-GIProbe dynamic objects were not working, fixed

-Added a half size GI option.
2021-01-24 19:29:07 -03:00
reduz
cdb216f4e4 Added ability to visualize native shaders 2021-01-06 09:40:09 -03:00
Rémi Verschelde
b5334d14f7
Update copyright statements to 2021
Happy new year to the wonderful Godot community!

2020 has been a tough year for most of us personally, but a good year for
Godot development nonetheless with a huge amount of work done towards Godot
4.0 and great improvements backported to the long-lived 3.2 branch.

We've had close to 400 contributors to engine code this year, authoring near
7,000 commit! (And that's only for the `master` branch and for the engine code,
there's a lot more when counting docs, demos and other first-party repos.)

Here's to a great year 2021 for all Godot users 🎆
2021-01-01 20:19:21 +01:00
reduz
7219f37cb5 Add API to get frame setup time on CPU
Needed for benchmarks
2020-12-24 00:13:52 -03:00
clayjohn
44f8922305 Port ASSAO to Godot to replace SAO 2020-12-21 23:08:59 -08:00
reduz
d2302f53d6 Implement automatic LOD (Level of Detail)
-Happens on import by default for all models
-Just works (tm)
-Biasing can be later adjusted per node or per viewport (as well as globally)
-Disabled AABB.get_support test because its broken
2020-12-18 15:48:03 +01:00
reduz
bf77016c8a Reimplement skeletons and blend shapes
Uses compute shaders, which only once, on demand, and all in parallel.
2020-12-16 14:32:04 -03:00
reduz
2787ad65be RenderingServer reorganization 2020-12-04 18:39:46 -03:00
reduz
e93b2242c2 Reorganize rendering server.
-Made RenderingServerScene abstract, allowing reimplementation
-RenderingServerRaster -> RenderingServerDefault, but this class is going away soon.
2020-12-03 19:01:01 -03:00