46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
// Copyright 2013-2014 The CGMath Developers. For a full listing of the authors,
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// refer to the AUTHORS file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Generic spatial bounds.
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use matrix::Matrix4;
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use num::BaseFloat;
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use plane::Plane;
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/// Spatial relation between two objects.
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#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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#[repr(u8)]
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pub enum Relation {
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/// Completely inside.
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In,
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/// Crosses the boundary.
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Cross,
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/// Completely outside.
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Out,
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}
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/// Generic bound.
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pub trait Bound<S: BaseFloat + 'static>: Sized {
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/// Classify the spatial relation with a plane.
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fn relate_plane(&self, &Plane<S>) -> Relation;
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/// Classify the relation with a projection matrix.
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fn relate_clip_space(&self, projection: &Matrix4<S>) -> Relation {
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use frustum::Frustum;
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match Frustum::from_matrix4(*projection) {
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Some(f) => f.contains(self),
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None => Relation::Cross,
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}
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}
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}
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