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Camera Driven Viewports (#4898)

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# Objective

Users should be able to render cameras to specific areas of a render target, which enables scenarios like split screen, minimaps, etc.

Builds on the new Camera Driven Rendering added here: #4745 
Fixes: #202
Alternative to #1389 and #3626 (which are incompatible with the new Camera Driven Rendering)

## Solution

![image](https://user-images.githubusercontent.com/2694663/171560044-f0694f67-0cd9-4598-83e2-a9658c4fed57.png)


Cameras can now configure an optional "viewport", which defines a rectangle within their render target to draw to. If a `Viewport` is defined, the camera's `CameraProjection`, `View`, and visibility calculations will use the viewport configuration instead of the full render target. 

```rust
// This camera will render to the first half of the primary window (on the left side).
commands.spawn_bundle(Camera3dBundle {
    camera: Camera {
        viewport: Some(Viewport {
            physical_position: UVec2::new(0, 0),
            physical_size: UVec2::new(window.physical_width() / 2, window.physical_height()),
            depth: 0.0..1.0,
        }),
        ..default()
    },
    ..default()
});
```

To account for this, the `Camera` component has received a few adjustments:

* `Camera` now has some new getter functions:
  * `logical_viewport_size`, `physical_viewport_size`, `logical_target_size`, `physical_target_size`, `projection_matrix`
*  All computed camera values are now private and live on the `ComputedCameraValues` field (logical/physical width/height, the projection matrix). They are now exposed on `Camera` via getters/setters  This wasn't _needed_ for viewports, but it was long overdue.

---

## Changelog

### Added

* `Camera` components now have a `viewport` field, which can be set to draw to a portion of a render target instead of the full target.
* `Camera` component has some new functions: `logical_viewport_size`, `physical_viewport_size`, `logical_target_size`, `physical_target_size`, and `projection_matrix`
* Added a new split_screen example illustrating how to render two cameras to the same scene

## Migration Guide

`Camera::projection_matrix` is no longer a public field. Use the new `Camera::projection_matrix()` method instead:

```rust

// Bevy 0.7
let projection = camera.projection_matrix;

// Bevy 0.8
let projection = camera.projection_matrix();
```
This commit is contained in:
Carter Anderson 2022-06-05 00:27:49 +00:00
parent 8e08e26c25
commit 5e2cfb2f19
11 changed files with 358 additions and 97 deletions
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12
Cargo.toml
View file

@ -176,6 +176,10 @@ path = "examples/2d/texture_atlas.rs"
name = "3d_scene"
path = "examples/3d/3d_scene.rs"
[[example]]
name = "3d_shapes"
path = "examples/3d/shapes.rs"
[[example]]
name = "lighting"
path = "examples/3d/lighting.rs"
@ -208,10 +212,6 @@ path = "examples/3d/render_to_texture.rs"
name = "shadow_biases"
path = "examples/3d/shadow_biases.rs"
[[example]]
name = "3d_shapes"
path = "examples/3d/shapes.rs"
[[example]]
name = "shadow_caster_receiver"
path = "examples/3d/shadow_caster_receiver.rs"
@ -220,6 +220,10 @@ path = "examples/3d/shadow_caster_receiver.rs"
name = "spherical_area_lights"
path = "examples/3d/spherical_area_lights.rs"
[[example]]
name = "split_screen"
path = "examples/3d/split_screen.rs"
[[example]]
name = "texture"
path = "examples/3d/texture.rs"

7
crates/bevy_core_pipeline/src/core_2d/main_pass_2d_node.rs
View file

@ -4,6 +4,7 @@ use crate::{
};
use bevy_ecs::prelude::*;
use bevy_render::{
camera::ExtractedCamera,
render_graph::{Node, NodeRunError, RenderGraphContext, SlotInfo, SlotType},
render_phase::{DrawFunctions, RenderPhase, TrackedRenderPass},
render_resource::{LoadOp, Operations, RenderPassDescriptor},
@ -14,6 +15,7 @@ use bevy_render::{
pub struct MainPass2dNode {
query: QueryState<
(
&'static ExtractedCamera,
&'static RenderPhase<Transparent2d>,
&'static ViewTarget,
&'static Camera2d,
@ -48,7 +50,7 @@ impl Node for MainPass2dNode {
world: &World,
) -> Result<(), NodeRunError> {
let view_entity = graph.get_input_entity(Self::IN_VIEW)?;
let (transparent_phase, target, camera_2d) =
let (camera, transparent_phase, target, camera_2d) =
if let Ok(result) = self.query.get_manual(world, view_entity) {
result
} else {
@ -79,6 +81,9 @@ impl Node for MainPass2dNode {
let mut draw_functions = draw_functions.write();
let mut tracked_pass = TrackedRenderPass::new(render_pass);
if let Some(viewport) = camera.viewport.as_ref() {
tracked_pass.set_camera_viewport(viewport);
}
for item in &transparent_phase.items {
let draw_function = draw_functions.get_mut(item.draw_function).unwrap();
draw_function.draw(world, &mut tracked_pass, view_entity, item);

13
crates/bevy_core_pipeline/src/core_3d/main_pass_3d_node.rs
View file

@ -4,6 +4,7 @@ use crate::{
};
use bevy_ecs::prelude::*;
use bevy_render::{
camera::ExtractedCamera,
render_graph::{Node, NodeRunError, RenderGraphContext, SlotInfo, SlotType},
render_phase::{DrawFunctions, RenderPhase, TrackedRenderPass},
render_resource::{LoadOp, Operations, RenderPassDepthStencilAttachment, RenderPassDescriptor},
@ -16,6 +17,7 @@ use bevy_utils::tracing::info_span;
pub struct MainPass3dNode {
query: QueryState<
(
&'static ExtractedCamera,
&'static RenderPhase<Opaque3d>,
&'static RenderPhase<AlphaMask3d>,
&'static RenderPhase<Transparent3d>,
@ -53,7 +55,7 @@ impl Node for MainPass3dNode {
world: &World,
) -> Result<(), NodeRunError> {
let view_entity = graph.get_input_entity(Self::IN_VIEW)?;
let (opaque_phase, alpha_mask_phase, transparent_phase, camera_3d, target, depth) =
let (camera, opaque_phase, alpha_mask_phase, transparent_phase, camera_3d, target, depth) =
match self.query.get_manual(world, view_entity) {
Ok(query) => query,
Err(_) => {
@ -100,6 +102,9 @@ impl Node for MainPass3dNode {
.begin_render_pass(&pass_descriptor);
let mut draw_functions = draw_functions.write();
let mut tracked_pass = TrackedRenderPass::new(render_pass);
if let Some(viewport) = camera.viewport.as_ref() {
tracked_pass.set_camera_viewport(viewport);
}
for item in &opaque_phase.items {
let draw_function = draw_functions.get_mut(item.draw_function).unwrap();
draw_function.draw(world, &mut tracked_pass, view_entity, item);
@ -136,6 +141,9 @@ impl Node for MainPass3dNode {
.begin_render_pass(&pass_descriptor);
let mut draw_functions = draw_functions.write();
let mut tracked_pass = TrackedRenderPass::new(render_pass);
if let Some(viewport) = camera.viewport.as_ref() {
tracked_pass.set_camera_viewport(viewport);
}
for item in &alpha_mask_phase.items {
let draw_function = draw_functions.get_mut(item.draw_function).unwrap();
draw_function.draw(world, &mut tracked_pass, view_entity, item);
@ -177,6 +185,9 @@ impl Node for MainPass3dNode {
.begin_render_pass(&pass_descriptor);
let mut draw_functions = draw_functions.write();
let mut tracked_pass = TrackedRenderPass::new(render_pass);
if let Some(viewport) = camera.viewport.as_ref() {
tracked_pass.set_camera_viewport(viewport);
}
for item in &transparent_phase.items {
let draw_function = draw_functions.get_mut(item.draw_function).unwrap();
draw_function.draw(world, &mut tracked_pass, view_entity, item);

67
crates/bevy_core_pipeline/src/core_3d/mod.rs
View file

@ -31,7 +31,7 @@ use bevy_render::{
},
renderer::RenderDevice,
texture::TextureCache,
view::{ExtractedView, ViewDepthTexture},
view::ViewDepthTexture,
RenderApp, RenderStage,
};
use bevy_utils::{FloatOrd, HashMap};
@ -53,7 +53,7 @@ impl Plugin for Core3dPlugin {
.init_resource::<DrawFunctions<AlphaMask3d>>()
.init_resource::<DrawFunctions<Transparent3d>>()
.add_system_to_stage(RenderStage::Extract, extract_core_3d_camera_phases)
.add_system_to_stage(RenderStage::Prepare, prepare_core_3d_views_system)
.add_system_to_stage(RenderStage::Prepare, prepare_core_3d_depth_textures)
.add_system_to_stage(RenderStage::PhaseSort, sort_phase_system::<Opaque3d>)
.add_system_to_stage(RenderStage::PhaseSort, sort_phase_system::<AlphaMask3d>)
.add_system_to_stage(RenderStage::PhaseSort, sort_phase_system::<Transparent3d>);
@ -199,13 +199,13 @@ pub fn extract_core_3d_camera_phases(
}
}
pub fn prepare_core_3d_views_system(
pub fn prepare_core_3d_depth_textures(
mut commands: Commands,
mut texture_cache: ResMut<TextureCache>,
msaa: Res<Msaa>,
render_device: Res<RenderDevice>,
views_3d: Query<
(Entity, &ExtractedView, Option<&ExtractedCamera>),
(Entity, &ExtractedCamera),
(
With<RenderPhase<Opaque3d>>,
With<RenderPhase<AlphaMask3d>>,
@ -214,37 +214,34 @@ pub fn prepare_core_3d_views_system(
>,
) {
let mut textures = HashMap::default();
for (entity, view, camera) in views_3d.iter() {
let mut get_cached_texture = || {
texture_cache.get(
&render_device,
TextureDescriptor {
label: Some("view_depth_texture"),
size: Extent3d {
depth_or_array_layers: 1,
width: view.width as u32,
height: view.height as u32,
},
mip_level_count: 1,
sample_count: msaa.samples,
dimension: TextureDimension::D2,
format: TextureFormat::Depth32Float, /* PERF: vulkan docs recommend using 24
* bit depth for better performance */
usage: TextureUsages::RENDER_ATTACHMENT,
},
)
};
let cached_texture = if let Some(camera) = camera {
textures
for (entity, camera) in views_3d.iter() {
if let Some(physical_target_size) = camera.physical_target_size {
let cached_texture = textures
.entry(camera.target.clone())
.or_insert_with(get_cached_texture)
.clone()
} else {
get_cached_texture()
};
commands.entity(entity).insert(ViewDepthTexture {
texture: cached_texture.texture,
view: cached_texture.default_view,
});
.or_insert_with(|| {
texture_cache.get(
&render_device,
TextureDescriptor {
label: Some("view_depth_texture"),
size: Extent3d {
depth_or_array_layers: 1,
width: physical_target_size.x,
height: physical_target_size.y,
},
mip_level_count: 1,
sample_count: msaa.samples,
dimension: TextureDimension::D2,
format: TextureFormat::Depth32Float, /* PERF: vulkan docs recommend using 24
* bit depth for better performance */
usage: TextureUsages::RENDER_ATTACHMENT,
},
)
})
.clone();
commands.entity(entity).insert(ViewDepthTexture {
texture: cached_texture.texture,
view: cached_texture.default_view,
});
}
}
}

14
crates/bevy_pbr/src/light.rs
View file

@ -736,7 +736,7 @@ pub(crate) fn assign_lights_to_clusters(
continue;
}
let screen_size = if let Some(screen_size) = camera.physical_target_size {
let screen_size = if let Some(screen_size) = camera.physical_viewport_size() {
screen_size
} else {
clusters.clear();
@ -747,7 +747,7 @@ pub(crate) fn assign_lights_to_clusters(
let view_transform = camera_transform.compute_matrix();
let inverse_view_transform = view_transform.inverse();
let is_orthographic = camera.projection_matrix.w_axis.w == 1.0;
let is_orthographic = camera.projection_matrix().w_axis.w == 1.0;
let far_z = match config.far_z_mode() {
ClusterFarZMode::MaxLightRange => {
@ -772,7 +772,7 @@ pub(crate) fn assign_lights_to_clusters(
// 3,2 = r * far and 2,2 = r where r = 1.0 / (far - near)
// rearranging r = 1.0 / (far - near), r * (far - near) = 1.0, r * far - 1.0 = r * near, near = (r * far - 1.0) / r
// = (3,2 - 1.0) / 2,2
(camera.projection_matrix.w_axis.z - 1.0) / camera.projection_matrix.z_axis.z
(camera.projection_matrix().w_axis.z - 1.0) / camera.projection_matrix().z_axis.z
}
(false, 1) => config.first_slice_depth().max(far_z),
_ => config.first_slice_depth(),
@ -804,7 +804,7 @@ pub(crate) fn assign_lights_to_clusters(
// it can overestimate more significantly when light ranges are only partially in view
let (light_aabb_min, light_aabb_max) = cluster_space_light_aabb(
inverse_view_transform,
camera.projection_matrix,
camera.projection_matrix(),
&light_sphere,
);
@ -871,7 +871,7 @@ pub(crate) fn assign_lights_to_clusters(
clusters.dimensions.x * clusters.dimensions.y * clusters.dimensions.z <= 4096
);
let inverse_projection = camera.projection_matrix.inverse();
let inverse_projection = camera.projection_matrix().inverse();
for lights in &mut clusters.lights {
lights.entities.clear();
@ -958,7 +958,7 @@ pub(crate) fn assign_lights_to_clusters(
let (light_aabb_xy_ndc_z_view_min, light_aabb_xy_ndc_z_view_max) =
cluster_space_light_aabb(
inverse_view_transform,
camera.projection_matrix,
camera.projection_matrix(),
&light_sphere,
);
@ -991,7 +991,7 @@ pub(crate) fn assign_lights_to_clusters(
radius: light_sphere.radius,
};
let light_center_clip =
camera.projection_matrix * view_light_sphere.center.extend(1.0);
camera.projection_matrix() * view_light_sphere.center.extend(1.0);
let light_center_ndc = light_center_clip.xyz() / light_center_clip.w;
let cluster_coordinates = ndc_position_to_cluster(
clusters.dimensions,

203
crates/bevy_render/src/camera/camera.rs
View file

@ -22,21 +22,72 @@ use bevy_transform::components::GlobalTransform;
use bevy_utils::HashSet;
use bevy_window::{WindowCreated, WindowId, WindowResized, Windows};
use serde::{Deserialize, Serialize};
use std::borrow::Cow;
use std::{borrow::Cow, ops::Range};
use wgpu::Extent3d;
/// Render viewport configuration for the [`Camera`] component.
///
/// The viewport defines the area on the render target to which the camera renders its image.
/// You can overlay multiple cameras in a single window using viewports to create effects like
/// split screen, minimaps, and character viewers.
// TODO: remove reflect_value when possible
#[derive(Reflect, Debug, Clone, Serialize, Deserialize)]
#[reflect_value(Default, Serialize, Deserialize)]
pub struct Viewport {
/// The physical position to render this viewport to within the [`RenderTarget`] of this [`Camera`].
/// (0,0) corresponds to the top-left corner
pub physical_position: UVec2,
/// The physical size of the viewport rectangle to render to within the [`RenderTarget`] of this [`Camera`].
/// The origin of the rectangle is in the top-left corner.
pub physical_size: UVec2,
/// The minimum and maximum depth to render (on a scale from 0.0 to 1.0).
pub depth: Range<f32>,
}
impl Default for Viewport {
fn default() -> Self {
Self {
physical_position: Default::default(),
physical_size: Default::default(),
depth: 0.0..1.0,
}
}
}
/// Information about the current [`RenderTarget`].
#[derive(Default, Debug, Clone)]
pub struct RenderTargetInfo {
/// The physical size of this render target (ignores scale factor).
pub physical_size: UVec2,
/// The scale factor of this render target.
pub scale_factor: f64,
}
/// Holds internally computed [`Camera`] values.
#[derive(Default, Debug, Clone)]
pub struct ComputedCameraValues {
projection_matrix: Mat4,
target_info: Option<RenderTargetInfo>,
}
#[derive(Component, Debug, Reflect, Clone)]
#[reflect(Component)]
pub struct Camera {
pub projection_matrix: Mat4,
pub logical_target_size: Option<Vec2>,
pub physical_target_size: Option<UVec2>,
/// If set, this camera will render to the given [`Viewport`] rectangle within the configured [`RenderTarget`].
pub viewport: Option<Viewport>,
/// Cameras with a lower priority will be rendered before cameras with a higher priority.
pub priority: isize,
/// If this is set to true, this camera will be rendered to its specified [`RenderTarget`]. If false, this
/// camera will not be rendered.
pub is_active: bool,
/// The method used to calculate this camera's depth. This will be used for projections and visibility.
pub depth_calculation: DepthCalculation,
/// Computed values for this camera, such as the projection matrix and the render target size.
#[reflect(ignore)]
pub computed: ComputedCameraValues,
/// The "target" that this camera will render to.
#[reflect(ignore)]
pub target: RenderTarget,
#[reflect(ignore)]
pub depth_calculation: DepthCalculation,
}
impl Default for Camera {
@ -44,9 +95,8 @@ impl Default for Camera {
Self {
is_active: true,
priority: 0,
projection_matrix: Default::default(),
logical_target_size: Default::default(),
physical_target_size: Default::default(),
viewport: None,
computed: Default::default(),
target: Default::default(),
depth_calculation: Default::default(),
}
@ -54,6 +104,63 @@ impl Default for Camera {
}
impl Camera {
/// The logical size of this camera's viewport. If the `viewport` field is set to [`Some`], this
/// will be the size of that custom viewport. Otherwise it will default to the full logical size of
/// the current [`RenderTarget`].
/// For logic that requires the full logical size of the [`RenderTarget`], prefer [`Camera::logical_target_size`].
#[inline]
pub fn logical_viewport_size(&self) -> Option<Vec2> {
let target_info = self.computed.target_info.as_ref()?;
self.viewport
.as_ref()
.map(|v| {
Vec2::new(
(v.physical_size.x as f64 / target_info.scale_factor) as f32,
(v.physical_size.y as f64 / target_info.scale_factor) as f32,
)
})
.or_else(|| self.logical_target_size())
}
/// The physical size of this camera's viewport. If the `viewport` field is set to [`Some`], this
/// will be the size of that custom viewport. Otherwise it will default to the full physical size of
/// the current [`RenderTarget`].
/// For logic that requires the full physical size of the [`RenderTarget`], prefer [`Camera::physical_target_size`].
#[inline]
pub fn physical_viewport_size(&self) -> Option<UVec2> {
self.viewport
.as_ref()
.map(|v| v.physical_size)
.or_else(|| self.physical_target_size())
}
/// The full logical size of this camera's [`RenderTarget`], ignoring custom `viewport` configuration.
/// Note that if the `viewport` field is [`Some`], this will not represent the size of the rendered area.
/// For logic that requires the size of the actually rendered area, prefer [`Camera::logical_viewport_size`].
#[inline]
pub fn logical_target_size(&self) -> Option<Vec2> {
self.computed.target_info.as_ref().map(|t| {
Vec2::new(
(t.physical_size.x as f64 / t.scale_factor) as f32,
(t.physical_size.y as f64 / t.scale_factor) as f32,
)
})
}
/// The full physical size of this camera's [`RenderTarget`], ignoring custom `viewport` configuration.
/// Note that if the `viewport` field is [`Some`], this will not represent the size of the rendered area.
/// For logic that requires the size of the actually rendered area, prefer [`Camera::physical_viewport_size`].
#[inline]
pub fn physical_target_size(&self) -> Option<UVec2> {
self.computed.target_info.as_ref().map(|t| t.physical_size)
}
/// The projection matrix computed using this camera's [`CameraProjection`].
#[inline]
pub fn projection_matrix(&self) -> Mat4 {
self.computed.projection_matrix
}
/// Given a position in world space, use the camera to compute the viewport-space coordinates.
///
/// To get the coordinates in Normalized Device Coordinates, you should use
@ -63,7 +170,7 @@ impl Camera {
camera_transform: &GlobalTransform,
world_position: Vec3,
) -> Option<Vec2> {
let target_size = self.logical_target_size?;
let target_size = self.logical_viewport_size()?;
let ndc_space_coords = self.world_to_ndc(camera_transform, world_position)?;
// NDC z-values outside of 0 < z < 1 are outside the camera frustum and are thus not in viewport-space
if ndc_space_coords.z < 0.0 || ndc_space_coords.z > 1.0 {
@ -86,7 +193,7 @@ impl Camera {
) -> Option<Vec3> {
// Build a transform to convert from world to NDC using camera data
let world_to_ndc: Mat4 =
self.projection_matrix * camera_transform.compute_matrix().inverse();
self.computed.projection_matrix * camera_transform.compute_matrix().inverse();
let ndc_space_coords: Vec3 = world_to_ndc.project_point3(world_position);
if !ndc_space_coords.is_nan() {
@ -109,6 +216,8 @@ impl CameraRenderGraph {
}
}
/// The "target" that a [`Camera`] will render to. For example, this could be a [`Window`](bevy_window::Window)
/// swapchain or an [`Image`].
#[derive(Debug, Clone, Reflect, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum RenderTarget {
/// Window to which the camera's view is rendered.
@ -138,28 +247,29 @@ impl RenderTarget {
}
}
}
pub fn get_physical_size(&self, windows: &Windows, images: &Assets<Image>) -> Option<UVec2> {
match self {
RenderTarget::Window(window_id) => windows
.get(*window_id)
.map(|window| UVec2::new(window.physical_width(), window.physical_height())),
RenderTarget::Image(image_handle) => images.get(image_handle).map(|image| {
pub fn get_render_target_info(
&self,
windows: &Windows,
images: &Assets<Image>,
) -> Option<RenderTargetInfo> {
Some(match self {
RenderTarget::Window(window_id) => {
let window = windows.get(*window_id)?;
RenderTargetInfo {
physical_size: UVec2::new(window.physical_width(), window.physical_height()),
scale_factor: window.scale_factor(),
}
}
RenderTarget::Image(image_handle) => {
let image = images.get(image_handle)?;
let Extent3d { width, height, .. } = image.texture_descriptor.size;
UVec2::new(width, height)
}),
}
.filter(|size| size.x > 0 && size.y > 0)
}
pub fn get_logical_size(&self, windows: &Windows, images: &Assets<Image>) -> Option<Vec2> {
match self {
RenderTarget::Window(window_id) => windows
.get(*window_id)
.map(|window| Vec2::new(window.width(), window.height())),
RenderTarget::Image(image_handle) => images.get(image_handle).map(|image| {
let Extent3d { width, height, .. } = image.texture_descriptor.size;
Vec2::new(width as f32, height as f32)
}),
}
RenderTargetInfo {
physical_size: UVec2::new(width, height),
scale_factor: 1.0,
}
}
})
}
// Check if this render target is contained in the given changed windows or images.
fn is_changed(
@ -243,11 +353,10 @@ pub fn camera_system<T: CameraProjection + Component>(
|| added_cameras.contains(&entity)
|| camera_projection.is_changed()
{
camera.logical_target_size = camera.target.get_logical_size(&windows, &images);
camera.physical_target_size = camera.target.get_physical_size(&windows, &images);
if let Some(size) = camera.logical_target_size {
camera.computed.target_info = camera.target.get_render_target_info(&windows, &images);
if let Some(size) = camera.logical_viewport_size() {
camera_projection.update(size.x, size.y);
camera.projection_matrix = camera_projection.get_projection_matrix();
camera.computed.projection_matrix = camera_projection.get_projection_matrix();
camera.depth_calculation = camera_projection.depth_calculation();
}
}
@ -257,7 +366,9 @@ pub fn camera_system<T: CameraProjection + Component>(
#[derive(Component, Debug)]
pub struct ExtractedCamera {
pub target: RenderTarget,
pub physical_size: Option<UVec2>,
pub physical_viewport_size: Option<UVec2>,
pub physical_target_size: Option<UVec2>,
pub viewport: Option<Viewport>,
pub render_graph: Cow<'static, str>,
pub priority: isize,
}
@ -276,19 +387,27 @@ pub fn extract_cameras(
if !camera.is_active {
continue;
}
if let Some(size) = camera.physical_target_size {
if let (Some(viewport_size), Some(target_size)) = (
camera.physical_viewport_size(),
camera.physical_target_size(),
) {
if target_size.x == 0 || target_size.y == 0 {
continue;
}
commands.get_or_spawn(entity).insert_bundle((
ExtractedCamera {
target: camera.target.clone(),
physical_size: Some(size),
viewport: camera.viewport.clone(),
physical_viewport_size: Some(viewport_size),
physical_target_size: Some(target_size),
render_graph: camera_render_graph.0.clone(),
priority: camera.priority,
},
ExtractedView {
projection: camera.projection_matrix,
projection: camera.projection_matrix(),
transform: *transform,
width: size.x,
height: size.y,
width: viewport_size.x,
height: viewport_size.y,
},
visible_entities.clone(),
));

15
crates/bevy_render/src/render_phase/draw_state.rs
View file

@ -1,4 +1,5 @@
use crate::{
camera::Viewport,
prelude::Color,
render_resource::{
BindGroup, BindGroupId, Buffer, BufferId, BufferSlice, RenderPipeline, RenderPipelineId,
@ -336,6 +337,20 @@ impl<'a> TrackedRenderPass<'a> {
.set_viewport(x, y, width, height, min_depth, max_depth);
}
/// Set the rendering viewport to the given [`Camera`](crate::camera::Viewport) [`Viewport`].
///
/// Subsequent draw calls will be projected into that viewport.
pub fn set_camera_viewport(&mut self, viewport: &Viewport) {
self.set_viewport(
viewport.physical_position.x as f32,
viewport.physical_position.y as f32,
viewport.physical_size.x as f32,
viewport.physical_size.y as f32,
viewport.depth.start,
viewport.depth.end,
);
}
/// Insert a single debug marker.
///
/// This is a GPU debugging feature. This has no effect on the rendering itself.

6
crates/bevy_render/src/view/mod.rs
View file

@ -172,7 +172,7 @@ fn prepare_view_targets(
) {
let mut sampled_textures = HashMap::default();
for (entity, camera) in cameras.iter() {
if let Some(size) = camera.physical_size {
if let Some(target_size) = camera.physical_target_size {
if let Some(texture_view) = camera.target.get_texture_view(&windows, &images) {
let sampled_target = if msaa.samples > 1 {
let sampled_texture = sampled_textures
@ -183,8 +183,8 @@ fn prepare_view_targets(
TextureDescriptor {
label: Some("sampled_color_attachment_texture"),
size: Extent3d {
width: size.x,
height: size.y,
width: target_size.x,
height: target_size.y,
depth_or_array_layers: 1,
},
mip_level_count: 1,

7
crates/bevy_ui/src/render/mod.rs
View file

@ -237,9 +237,10 @@ pub fn extract_default_ui_camera_view<T: Component>(
{
continue;
}
if let (Some(logical_size), Some(physical_size)) =
(camera.logical_target_size, camera.physical_target_size)
{
if let (Some(logical_size), Some(physical_size)) = (
camera.logical_viewport_size(),
camera.physical_viewport_size(),
) {
let mut projection = OrthographicProjection {
far: UI_CAMERA_FAR,
window_origin: WindowOrigin::BottomLeft,

108
examples/3d/split_screen.rs Normal file
View file

@ -0,0 +1,108 @@
//! Renders two cameras to the same window to accomplish "split screen".
use bevy::{
core_pipeline::clear_color::ClearColorConfig,
prelude::*,
render::camera::Viewport,
window::{WindowId, WindowResized},
};
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_startup_system(setup)
.add_system(set_camera_viewports)
.run();
}
/// set up a simple 3D scene
fn setup(
mut commands: Commands,
asset_server: Res<AssetServer>,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
// plane
commands.spawn_bundle(PbrBundle {
mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
..default()
});
commands.spawn_scene(asset_server.load("models/animated/Fox.glb#Scene0"));
// Light
commands.spawn_bundle(DirectionalLightBundle {
transform: Transform::from_rotation(Quat::from_euler(
EulerRot::ZYX,
0.0,
1.0,
-std::f32::consts::FRAC_PI_4,
)),
directional_light: DirectionalLight {
shadows_enabled: true,
..default()
},
..default()
});
// Left Camera
commands
.spawn_bundle(Camera3dBundle {
transform: Transform::from_xyz(0.0, 200.0, -100.0).looking_at(Vec3::ZERO, Vec3::Y),
..default()
})
.insert(LeftCamera);
// Right Camera
commands
.spawn_bundle(Camera3dBundle {
transform: Transform::from_xyz(100.0, 100., 150.0).looking_at(Vec3::ZERO, Vec3::Y),
camera: Camera {
// Renders the right camera after the left camera, which has a default priority of 0
priority: 1,
..default()
},
camera_3d: Camera3d {
// dont clear on the second camera because the first camera already cleared the window
clear_color: ClearColorConfig::None,
},
..default()
})
.insert(RightCamera);
}
#[derive(Component)]
struct LeftCamera;
#[derive(Component)]
struct RightCamera;
fn set_camera_viewports(
windows: Res<Windows>,
mut resize_events: EventReader<WindowResized>,
mut left_camera: Query<&mut Camera, (With<LeftCamera>, Without<RightCamera>)>,
mut right_camera: Query<&mut Camera, With<RightCamera>>,
) {
// We need to dynamically resize the camera's viewports whenever the window size changes
// so then each camera always takes up half the screen.
// A resize_event is sent when the window is first created, allowing us to reuse this system for initial setup.
for resize_event in resize_events.iter() {
if resize_event.id == WindowId::primary() {
let window = windows.primary();
let mut left_camera = left_camera.single_mut();
left_camera.viewport = Some(Viewport {
physical_position: UVec2::new(0, 0),
physical_size: UVec2::new(window.physical_width() / 2, window.physical_height()),
..default()
});
let mut right_camera = right_camera.single_mut();
right_camera.viewport = Some(Viewport {
physical_position: UVec2::new(window.physical_width() / 2, 0),
physical_size: UVec2::new(window.physical_width() / 2, window.physical_height()),
..default()
});
}
}
}

3
examples/README.md
View file

@ -103,6 +103,7 @@ Example | File | Description
Example | File | Description
--- | --- | ---
`3d_scene` | [`3d/3d_scene.rs`](./3d/3d_scene.rs) | Simple 3D scene with basic shapes and lighting
`3d_shapes` | [`3d/shapes.rs`](./3d/shapes.rs) | A scene showcasing the built-in 3D shapes
`lighting` | [`3d/lighting.rs`](./3d/lighting.rs) | Illustrates various lighting options in a simple scene
`load_gltf` | [`3d/load_gltf.rs`](./3d/load_gltf.rs) | Loads and renders a gltf file as a scene
`msaa` | [`3d/msaa.rs`](./3d/msaa.rs) | Configures MSAA (Multi-Sample Anti-Aliasing) for smoother edges
@ -113,12 +114,12 @@ Example | File | Description
`shadow_caster_receiver` | [`3d/shadow_caster_receiver.rs`](./3d/shadow_caster_receiver.rs) | Demonstrates how to prevent meshes from casting/receiving shadows in a 3d scene
`shadow_biases` | [`3d/shadow_biases.rs`](./3d/shadow_biases.rs) | Demonstrates how shadow biases affect shadows in a 3d scene
`spherical_area_lights` | [`3d/spherical_area_lights.rs`](./3d/spherical_area_lights.rs) | Demonstrates how point light radius values affect light behavior.
`split_screen` | [`3d/split_screen.rs`](./3d/split_screen.rs) | Demonstrates how to render two cameras to the same window to accomplish "split screen".
`texture` | [`3d/texture.rs`](./3d/texture.rs) | Shows configuration of texture materials
`two_passes` | [`3d/two_passes.rs`](./3d/two_passes.rs) | Renders two 3d passes to the same window from different perspectives.
`update_gltf_scene` | [`3d/update_gltf_scene.rs`](./3d/update_gltf_scene.rs) | Update a scene from a gltf file, either by spawning the scene as a child of another entity, or by accessing the entities of the scene
`vertex_colors` | [`3d/vertex_colors.rs`](./3d/vertex_colors.rs) | Shows the use of vertex colors
`wireframe` | [`3d/wireframe.rs`](./3d/wireframe.rs) | Showcases wireframe rendering
`3d_shapes` | [`3d/shapes.rs`](./3d/shapes.rs) | A scene showcasing the built-in 3D shapes
## Animation