mirror of
https://github.com/bevyengine/bevy
synced 2024-11-26 22:50:19 +00:00
b1476015d9
based on #3031 Adds some examples showing of how to use the new pipelined rendering for custom shaders. - a minimal shader example which doesn't use render assets - the same but using glsl - an example showing how to render instanced data - a shader which uses the seconds since startup to animate some textures Instancing shader:  Animated shader:  (the gif makes it look a bit ugly) Co-authored-by: Carter Anderson <mcanders1@gmail.com>
67 lines
No EOL
2 KiB
WebGPU Shading Language
67 lines
No EOL
2 KiB
WebGPU Shading Language
[[group(0), binding(0)]]
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var texture: texture_storage_2d<rgba8unorm, read_write>;
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fn hash(value: u32) -> u32 {
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var state = value;
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state = state ^ 2747636419u;
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state = state * 2654435769u;
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state = state ^ state >> 16u;
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state = state * 2654435769u;
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state = state ^ state >> 16u;
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state = state * 2654435769u;
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return state;
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}
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fn randomFloat(value: u32) -> f32 {
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return f32(hash(value)) / 4294967295.0;
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}
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[[stage(compute), workgroup_size(8, 8, 1)]]
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fn init([[builtin(global_invocation_id)]] invocation_id: vec3<u32>, [[builtin(num_workgroups)]] num_workgroups: vec3<u32>) {
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let location = vec2<i32>(i32(invocation_id.x), i32(invocation_id.y));
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let location_f32 = vec2<f32>(f32(invocation_id.x), f32(invocation_id.y));
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let randomNumber = randomFloat(invocation_id.y * num_workgroups.x + invocation_id.x);
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let alive = randomNumber > 0.9;
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let color = vec4<f32>(f32(alive));
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textureStore(texture, location, color);
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}
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fn get(location: vec2<i32>, offset_x: i32, offset_y: i32) -> i32 {
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let value: vec4<f32> = textureLoad(texture, location + vec2<i32>(offset_x, offset_y));
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return i32(value.x);
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}
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fn count_alive(location: vec2<i32>) -> i32 {
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return get(location, -1, -1) +
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get(location, -1, 0) +
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get(location, -1, 1) +
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get(location, 0, -1) +
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get(location, 0, 1) +
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get(location, 1, -1) +
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get(location, 1, 0) +
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get(location, 1, 1);
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}
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[[stage(compute), workgroup_size(8, 8, 1)]]
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fn update([[builtin(global_invocation_id)]] invocation_id: vec3<u32>) {
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let location = vec2<i32>(i32(invocation_id.x), i32(invocation_id.y));
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let n_alive = count_alive(location);
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let color = vec4<f32>(f32(n_alive) / 8.0);
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var alive: bool;
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if (n_alive == 3) {
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alive = true;
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} else if (n_alive == 2) {
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let currently_alive = get(location, 0, 0);
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alive = bool(currently_alive);
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} else {
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alive = false;
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}
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storageBarrier();
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textureStore(texture, location, vec4<f32>(f32(alive)));
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} |