Sienna Meridian Satterwhite
b03b71c1d9
Closes #6, #7, #8, #9, #10 Refs #2, #122 Vendored bevy_render, bevy_core_pipeline, and bevy_pbr from Bevy v0.17.2 (commit 566358363126dd69f6e457e47f306c68f8041d2a) into libmarathon. - ~51K LOC vendored to crates/libmarathon/src/render/ - Merged bevy_render_macros into crates/macros/ - Fixed 773→0 compilation errors - Updated dependencies (encase 0.10→0.11, added 4 new deps) - Removed bevy_render/pbr/core_pipeline from app Cargo features All builds passing, macOS smoke test successful. Signed-off-by: Sienna Meridian Satterwhite <sienna@r3t.io>
49 lines
1.9 KiB
WebGPU Shading Language
49 lines
1.9 KiB
WebGPU Shading Language
#import bevy_pbr::atmosphere::{
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types::{Atmosphere, AtmosphereSettings},
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bindings::{settings, atmosphere},
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functions::{AtmosphereSample, sample_atmosphere, get_local_r, max_atmosphere_distance, MIDPOINT_RATIO},
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bruneton_functions::{transmittance_lut_uv_to_r_mu, distance_to_bottom_atmosphere_boundary, distance_to_top_atmosphere_boundary},
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}
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#import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput
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@group(0) @binding(13) var transmittance_lut_out: texture_storage_2d<rgba16float, write>;
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@compute
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@workgroup_size(16, 16, 1)
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fn main(@builtin(global_invocation_id) idx: vec3<u32>) {
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let uv: vec2<f32> = (vec2<f32>(idx.xy) + 0.5) / vec2<f32>(settings.transmittance_lut_size);
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// map UV coordinates to view height (r) and zenith cos angle (mu)
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let r_mu = transmittance_lut_uv_to_r_mu(uv);
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// compute the optical depth from view height r to the top atmosphere boundary
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let optical_depth = ray_optical_depth(r_mu.x, r_mu.y, settings.transmittance_lut_samples);
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let transmittance = exp(-optical_depth);
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textureStore(transmittance_lut_out, idx.xy, vec4(transmittance, 1.0));
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}
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/// Compute the optical depth of the atmosphere from the ground to the top atmosphere boundary
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/// at a given view height (r) and zenith cos angle (mu)
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fn ray_optical_depth(r: f32, mu: f32, sample_count: u32) -> vec3<f32> {
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let t_max = max_atmosphere_distance(r, mu);
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var optical_depth = vec3<f32>(0.0f);
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var prev_t = 0.0f;
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for (var i = 0u; i < sample_count; i++) {
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let t_i = t_max * (f32(i) + MIDPOINT_RATIO) / f32(sample_count);
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let dt = t_i - prev_t;
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prev_t = t_i;
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let r_i = get_local_r(r, mu, t_i);
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let atmosphere_sample = sample_atmosphere(r_i);
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let sample_optical_depth = atmosphere_sample.extinction * dt;
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optical_depth += sample_optical_depth;
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}
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return optical_depth;
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}
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