119 lines
3.7 KiB
Rust
119 lines
3.7 KiB
Rust
use bevy::{
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prelude::*,
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render::{
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mesh::shape,
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pipeline::{DynamicBinding, PipelineDescriptor, PipelineSpecialization, RenderPipeline},
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render_graph::{base, AssetRenderResourcesNode, RenderGraph},
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renderer::RenderResources,
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shader::{ShaderStage, ShaderStages},
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},
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};
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/// This example illustrates how to create a custom material asset and a shader that uses that material
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fn main() {
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App::build()
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.add_default_plugins()
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.add_asset::<MyMaterial>()
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.add_startup_system(setup.system())
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.run();
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}
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#[derive(RenderResources, Default)]
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struct MyMaterial {
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pub color: Color,
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}
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const VERTEX_SHADER: &str = r#"
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#version 450
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layout(location = 0) in vec3 Vertex_Position;
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layout(set = 0, binding = 0) uniform Camera {
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mat4 ViewProj;
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};
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layout(set = 1, binding = 0) uniform Transform {
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mat4 Model;
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};
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void main() {
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gl_Position = ViewProj * Model * vec4(Vertex_Position, 1.0);
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}
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"#;
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const FRAGMENT_SHADER: &str = r#"
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#version 450
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layout(location = 0) out vec4 o_Target;
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layout(set = 1, binding = 1) uniform MyMaterial_color {
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vec4 color;
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};
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void main() {
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o_Target = color;
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}
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"#;
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fn setup(
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mut commands: Commands,
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mut pipelines: ResMut<Assets<PipelineDescriptor>>,
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mut shaders: ResMut<Assets<Shader>>,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<MyMaterial>>,
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mut render_graph: ResMut<RenderGraph>,
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) {
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// Create a new shader pipeline
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let pipeline_handle = pipelines.add(PipelineDescriptor::default_config(ShaderStages {
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vertex: shaders.add(Shader::from_glsl(ShaderStage::Vertex, VERTEX_SHADER)),
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fragment: Some(shaders.add(Shader::from_glsl(ShaderStage::Fragment, FRAGMENT_SHADER))),
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}));
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// Add an AssetRenderResourcesNode to our Render Graph. This will bind MyMaterial resources to our shader
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render_graph.add_system_node(
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"my_material",
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AssetRenderResourcesNode::<MyMaterial>::new(true),
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);
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// Add a Render Graph edge connecting our new "my_material" node to the main pass node. This ensures "my_material" runs before the main pass
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render_graph
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.add_node_edge("my_material", base::node::MAIN_PASS)
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.unwrap();
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// Create a new material
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let material = materials.add(MyMaterial {
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color: Color::rgb(0.0, 0.8, 0.0),
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});
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// Setup our world
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commands
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// cube
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.spawn(MeshComponents {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
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render_pipelines: RenderPipelines::from_pipelines(vec![RenderPipeline::specialized(
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pipeline_handle,
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// NOTE: in the future you wont need to manually declare dynamic bindings
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PipelineSpecialization {
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dynamic_bindings: vec![
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// Transform
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DynamicBinding {
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bind_group: 1,
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binding: 0,
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},
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// MyMaterial_color
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DynamicBinding {
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bind_group: 1,
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binding: 1,
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},
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],
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..Default::default()
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},
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)]),
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transform: Transform::from_translation(Vec3::new(0.0, 0.0, 0.0)),
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..Default::default()
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})
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.with(material)
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// camera
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.spawn(Camera3dComponents {
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transform: Transform::new(Mat4::face_toward(
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Vec3::new(3.0, 5.0, -8.0),
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Vec3::new(0.0, 0.0, 0.0),
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Vec3::new(0.0, 1.0, 0.0),
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)),
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..Default::default()
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});
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}
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