Serkyo
10b035504c
The fixed 500-block far plane clipped geometry before fog saturated, making the clip plane itself the visible boundary at large view distances.
38 lines
1.3 KiB
Rust
38 lines
1.3 KiB
Rust
// SPDX-License-Identifier: AGPL-3.0-only
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//! Unit tests for the pure helpers in [`crate::renderer`].
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use super::*;
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#[test]
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fn far_plane_floors_at_the_minimum_for_near_fog() {
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// Fog that saturates well inside the minimum leaves the far plane at the floor; shrinking it to match would clip geometry for no gain.
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assert!((far_plane_for(128.0, 64.0) - MIN_FAR_PLANE).abs() < f32::EPSILON);
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}
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#[test]
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fn far_plane_covers_the_diagonal_of_the_two_extents() {
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// 768 horizontal and 384 vertical (a radius-24 cylinder) reach 858.6 at the corner, past the 500-block floor.
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let far = far_plane_for(768.0, 384.0);
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assert!(far > MIN_FAR_PLANE);
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assert!(
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(far - 858.65_f32).abs() < 0.01,
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"unexpected far plane {far}"
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);
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}
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#[test]
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fn far_plane_reaches_past_each_extent_taken_alone() {
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// The corner of the box is further than either edge, so covering only the larger extent would still clip partially-visible fragments near the diagonal.
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let (horizontal, vertical) = (768.0_f32, 384.0_f32);
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let far = far_plane_for(horizontal, vertical);
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assert!(far > horizontal);
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assert!(far > vertical);
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}
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#[test]
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fn far_plane_is_well_formed_without_fog() {
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// A caller that supplies no fog distance must still receive a usable projection rather than a degenerate zero-depth one.
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assert!(far_plane_for(0.0, 0.0) > 0.0);
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}
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