A Viewport creates a different view into the screen, or a sub-view inside another viewport. Children 2D Nodes will display on it, and children Camera 3D nodes will render on it too.
Optionally, a viewport can have its own 2D or 3D world, so they don't share what they draw with other viewports.
Viewports can also choose to be audio listeners, so they generate positional audio depending on a 2D or 3D camera child of it.
Also, viewports can be assigned to different screens in case the devices have multiple screens.
Finally, viewports can also behave as render targets, in which case they will not be visible unless the associated texture is used to draw.
[b]Note:[/b] By default, a newly created Viewport in Godot 3.x will appear to be upside down. Enabling [member render_target_v_flip] will display the Viewport with the correct orientation.
Returns the size override set with [method set_size_override].
</description>
</method>
<methodname="get_texture"qualifiers="const">
<returntype="ViewportTexture"/>
<description>
Returns the viewport's texture.
[b]Note:[/b] Due to the way OpenGL works, the resulting [ViewportTexture] is flipped vertically. You can use [method Image.flip_y] on the result of [method Texture.get_data] to flip it back, for example:
Returns [code]true[/code] if the size override is enabled. See [method set_size_override].
</description>
</method>
<methodname="set_attach_to_screen_rect">
<returntype="void"/>
<argumentindex="0"name="rect"type="Rect2"/>
<description>
Attaches this [Viewport] to the root [Viewport] with the specified rectangle. This bypasses the need for another node to display this [Viewport] but makes you responsible for updating the position of this [Viewport] manually.
</description>
</method>
<methodname="set_input_as_handled">
<returntype="void"/>
<description>
Stops the input from propagating further down the [SceneTree].
Sets the number of subdivisions to use in the specified quadrant. A higher number of subdivisions allows you to have more shadows in the scene at once, but reduces the quality of the shadows. A good practice is to have quadrants with a varying number of subdivisions and to have as few subdivisions as possible.
Sets the size override of the viewport. If the [code]enable[/code] parameter is [code]true[/code] the override is used, otherwise it uses the default size. If the size parameter is [code](-1, -1)[/code], it won't update the size.
If [code]true[/code], uses a fast post-processing filter to make banding significantly less visible in 3D. 2D rendering is [i]not[/i] affected by debanding unless the [member Environment.background_mode] is [constant Environment.BG_CANVAS]. In this case, [member usage] must also be set to [constant USAGE_3D]. See also [member ProjectSettings.rendering/quality/filters/use_debanding].
In some cases, debanding may introduce a slightly noticeable dithering pattern. It's recommended to enable debanding only when actually needed since the dithering pattern will make lossless-compressed screenshots larger.
Enables fast approximate antialiasing. FXAA is a popular screen-space antialiasing method, which is fast but will make the image look blurry, especially at lower resolutions. It can still work relatively well at large resolutions such as 1440p and 4K. Some of the lost sharpness can be recovered by enabling contrast-adaptive sharpening (see [member sharpen_intensity]).
If [code]true[/code], the viewport rendering will receive benefits from High Dynamic Range algorithm. High Dynamic Range allows the viewport to receive values that are outside the 0-1 range. In Godot, HDR uses half floating-point precision (16-bit) by default. To use full floating-point precision (32-bit), enable [member use_32_bpc_depth].
[b]Note:[/b] Requires [member usage] to be set to [constant USAGE_3D] or [constant USAGE_3D_NO_EFFECTS], since HDR is not supported for 2D.
If [code]true[/code], the result after 3D rendering will not have a linear to sRGB color conversion applied. This is important when the viewport is used as a render target where the result is used as a texture on a 3D object rendered in another viewport. It is also important if the viewport is used to create data that is not color based (noise, heightmaps, pickmaps, etc.). Do not enable this when the viewport is used as a texture on a 2D object or if the viewport is your final output. For the GLES2 driver this will convert the sRGB output to linear, this should only be used for VR plugins that require input in linear color space!
The multisample anti-aliasing mode. A higher number results in smoother edges at the cost of significantly worse performance. A value of 4 is best unless targeting very high-end systems.
If [code]true[/code], renders the Viewport directly to the screen instead of to the root viewport. Only available in GLES2. This is a low-level optimization and should not be used in most cases. If used, reading from the Viewport or from [code]SCREEN_TEXTURE[/code] becomes unavailable. For more information see [method RenderingServer.viewport_set_render_direct_to_screen].
If [code]true[/code], the result of rendering will be flipped vertically. Since Viewports in Godot 3.x render upside-down, it's recommended to set this to [code]true[/code] in most situations.
[b]Note:[/b] If this is set to [code]0[/code], both point [i]and[/i] directional shadows won't be visible. Since user-created viewports default to a value of [code]0[/code], this value must be set above [code]0[/code] manually (typically at least [code]256[/code]).
If set to a value greater than [code]0.0[/code], contrast-adaptive sharpening will be applied to the 3D viewport. This has a low performance cost and can be used to recover some of the sharpness lost from using FXAA. Values around [code]0.5[/code] generally give the best results. See also [member fxaa].
The viewport's rendering mode. This controls which buffers are allocated for the viewport (2D only, or 2D + 3D). 2D-only options can reduce memory usage and improve performance slightly, especially on low-end devices.
[b]Note:[/b] If set to [constant USAGE_2D] or [constant USAGE_2D_NO_SAMPLING], [member hdr] will have no effect when enabled since HDR is not supported for 2D.
If [code]true[/code], allocates the viewport's framebuffer with full floating-point precision (32-bit) instead of half floating-point precision (16-bit). Only effective when [member hdr] is also enabled.
[b]Note:[/b] Enabling this setting does not improve rendering quality. Using full floating-point precision is slower, and is generally only needed for advanced shaders that require a high level of precision. To reduce banding, enable [member debanding] instead.
[b]Note:[/b] Only available on the GLES3 backend.
</member>
</members>
<signals>
<signalname="gui_focus_changed">
<argumentindex="0"name="node"type="Control"/>
<description>
Emitted when a Control node grabs keyboard focus.
</description>
</signal>
<signalname="size_changed">
<description>
Emitted when the size of the viewport is changed, whether by [method set_size_override], resize of window, or some other means.
This quadrant will be split 256 ways and used by up to 256 shadow maps. Unless the [member shadow_atlas_size] is very high, the shadows in this quadrant will be very low resolution.
This quadrant will be split 1024 ways and used by up to 1024 shadow maps. Unless the [member shadow_atlas_size] is very high, the shadows in this quadrant will be very low resolution.
Multisample anti-aliasing mode disabled. This is the default value.
</constant>
<constantname="MSAA_2X"value="1"enum="MSAA">
Use 2x Multisample Antialiasing.
</constant>
<constantname="MSAA_4X"value="2"enum="MSAA">
Use 4x Multisample Antialiasing.
</constant>
<constantname="MSAA_8X"value="3"enum="MSAA">
Use 8x Multisample Antialiasing. Likely unsupported on low-end and older hardware.
</constant>
<constantname="MSAA_16X"value="4"enum="MSAA">
Use 16x Multisample Antialiasing. Likely unsupported on medium and low-end hardware.
</constant>
<constantname="USAGE_2D"value="0"enum="Usage">
Allocates all buffers needed for drawing 2D scenes. This takes less VRAM than the 3D usage modes. Note that 3D rendering effects such as glow and HDR are not available when using this mode.
Allocates buffers needed for 2D scenes without allocating a buffer for screen copy. Accordingly, you cannot read from the screen. Of the [enum Usage] types, this requires the least VRAM. Note that 3D rendering effects such as glow and HDR are not available when using this mode.
</constant>
<constantname="USAGE_3D"value="2"enum="Usage">
Allocates full buffers for drawing 3D scenes and all 3D effects including buffers needed for 2D scenes and effects.
Allocates buffers needed for drawing 3D scenes. But does not allocate buffers needed for reading from the screen and post-processing effects. Saves some VRAM.
