shader_material_screenspace_texture.rs:
use bevy::{
prelude::*,
reflect::TypePath,
render::render_resource::{AsBindGroup, ShaderRef},
};
const SHADER_ASSET_PATH: &str = "shaders/custom_material_screenspace_texture.wgsl";
fn main() {
App::new()
.add_plugins((DefaultPlugins, MaterialPlugin::<CustomMaterial>::default()))
.add_systems(Startup, setup)
.add_systems(Update, rotate_camera)
.run();
}
#[derive(Component)]
struct MainCamera;
fn setup(
mut commands: Commands,
asset_server: Res<AssetServer>,
mut meshes: ResMut<Assets<Mesh>>,
mut custom_materials: ResMut<Assets<CustomMaterial>>,
mut standard_materials: ResMut<Assets<StandardMaterial>>,
) {
commands.spawn((
Mesh3d(meshes.add(Plane3d::default().mesh().size(5.0, 5.0))),
MeshMaterial3d(standard_materials.add(Color::srgb(0.3, 0.5, 0.3))),
));
commands.spawn((PointLight::default(), Transform::from_xyz(4.0, 8.0, 4.0)));
commands.spawn((
Mesh3d(meshes.add(Cuboid::default())),
MeshMaterial3d(custom_materials.add(CustomMaterial {
texture: asset_server.load(
"models/FlightHelmet/FlightHelmet_Materials_LensesMat_OcclusionRoughMetal.png",
),
})),
Transform::from_xyz(0.0, 0.5, 0.0),
));
commands.spawn((
Camera3d::default(),
Transform::from_xyz(4.0, 2.5, 4.0).looking_at(Vec3::ZERO, Vec3::Y),
MainCamera,
));
}
fn rotate_camera(mut cam_transform: Single<&mut Transform, With<MainCamera>>, time: Res<Time>) {
cam_transform.rotate_around(
Vec3::ZERO,
Quat::from_axis_angle(Vec3::Y, 45f32.to_radians() * time.delta_secs()),
);
cam_transform.look_at(Vec3::ZERO, Vec3::Y);
}
#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
struct CustomMaterial {
#[texture(0)]
#[sampler(1)]
texture: Handle<Image>,
}
impl Material for CustomMaterial {
fn fragment_shader() -> ShaderRef {
SHADER_ASSET_PATH.into()
}
}
shaders/custom_material_screenspace_texture.wgsl:
#import bevy_pbr::{
mesh_view_bindings::view,
forward_io::VertexOutput,
utils::coords_to_viewport_uv,
}
@group(2) @binding(0) var texture: texture_2d<f32>;
@group(2) @binding(1) var texture_sampler: sampler;
@fragment
fn fragment(
mesh: VertexOutput,
) -> @location(0) vec4<f32> {
let viewport_uv = coords_to_viewport_uv(mesh.position.xy, view.viewport);
let color = textureSample(texture, texture_sampler, viewport_uv);
return color;
}