Feature: 2d Point Lights.

[Adriigbs]

Objective

2d Point Light implementation and integration inside Sprite Plugin.

• Point lights with configurable radius, color, and intensity;
• Light falloff (linear or exponential);

Solution

crates/bevy_sprite/src/light/point_light_2d.rs:

• PointLight2D component and FallOffType enum definition.

crates/bevy_sprite/src/render/light.rs:

• Light extraction from PointLight2D into ExtractedPointLight2D.
• Processes and store the extracted lights into GpuLights2D for GPU consumption.

crates/bevy_sprite/src/render/mod.rs:

• Create and add the light bind group to the Sprite pipeline.

crates/bevy_sprite/src/lib.rs:

• Add extract_point_lights_2d and prepare_point_lights_2d to the SpritePlugin.

crates/bevy_sprite/src/render/sprite.wgsl

• Light computation.
• Apply it to the sprite.

Testing

• tests/light_render.rs
• examples/2dscene.rs:
  O: Set intensity to 0;
  ArrowUp: Increase intensity;
  ArrowDown: Decrease intensity;
  ArrowRight: Change color;
  N: Change scene;
  SpaceBar: Change fall off type.
• Might need performance tests.

Showcase

demo.mp4

[github-actions]

Your PR caused a change in the graphical output of an example or rendering test. This might be intentional, but it could also mean that something broke!
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[KurlykovDanila]

Amazing progress! As I understand it, all sprites are lit without exception. Is it possible to add a component to ignore lighting for a specific sprite? I think this would be very useful and many may be waiting for this feature, thanks.

[Adriigbs]

@KurlykovDanila that is totally doable and it didn't cross my mind. I'll be working on that and on the CI errors. Thanks!!