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# Objective - A lot of mid-level rendering apis are hard to figure out because they don't have any examples - SpecializedMeshPipeline can be really useful in some cases when you want more flexibility than a Material without having to go to low level apis. ## Solution - Add an example showing how to make a custom `SpecializedMeshPipeline`. ## Testing - Did you test these changes? If so, how? - Are there any parts that need more testing? - How can other people (reviewers) test your changes? Is there anything specific they need to know? - If relevant, what platforms did you test these changes on, and are there any important ones you can't test? --- ## Showcase The examples just spawns 3 triangles in a triangle pattern.  --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
48 lines
No EOL
1.7 KiB
WebGPU Shading Language
48 lines
No EOL
1.7 KiB
WebGPU Shading Language
//! Very simple shader used to demonstrate how to get the world position and pass data
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//! between the vertex and fragment shader. Also shows the custom vertex layout.
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// First we import everything we need from bevy_pbr
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// A 2d shader would be vevry similar but import from bevy_sprite instead
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#import bevy_pbr::{
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mesh_functions,
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view_transformations::position_world_to_clip
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}
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struct Vertex {
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// This is needed if you are using batching and/or gpu preprocessing
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// It's a built in so you don't need to define it in the vertex layout
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@builtin(instance_index) instance_index: u32,
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// Like we defined for the vertex layout
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// position is at location 0
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@location(0) position: vec3<f32>,
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// and color at location 1
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@location(1) color: vec4<f32>,
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};
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// This is the output of the vertex shader and we also use it as the input for the fragment shader
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struct VertexOutput {
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@builtin(position) clip_position: vec4<f32>,
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@location(0) world_position: vec4<f32>,
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@location(1) color: vec3<f32>,
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};
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@vertex
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fn vertex(vertex: Vertex) -> VertexOutput {
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var out: VertexOutput;
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// This is how bevy computes the world position
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// The vertex.instance_index is very important. Esepecially if you are using batching and gpu preprocessing
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var world_from_local = mesh_functions::get_world_from_local(vertex.instance_index);
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out.world_position = mesh_functions::mesh_position_local_to_world(world_from_local, vec4(vertex.position, 1.0));
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out.clip_position = position_world_to_clip(out.world_position.xyz);
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// We just use the raw vertex color
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out.color = vertex.color.rgb;
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return out;
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}
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@fragment
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fn fragment(in: VertexOutput) -> @location(0) vec4<f32> {
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// output the color directly
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return vec4(in.color, 1.0);
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} |