69 lines
2.5 KiB
Rust
69 lines
2.5 KiB
Rust
// Copyright 2013-2014 The CGMath Developers. For a full listing of the authors,
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// refer to the Cargo.toml 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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extern crate cgmath;
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use cgmath::{Vector4, ortho, Matrix4};
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#[test]
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fn test_ortho_scale() {
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// An orthographic projection can be used to scale points
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// but this will result in the clip space (Z) being swapped (-1 -> 1)
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// this test asserts that this property is true of our ortho projection
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let vec_near: Vector4<f32> = Vector4::new(-1., -1., -1., 1.);
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let vec_orig: Vector4<f32> = Vector4::new(0., 0., 0., 1.);
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let vec_far: Vector4<f32> = Vector4::new(1., 1., 1., 1.);
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let o: Matrix4<f32> = ortho(-1., 1., -1., 1., -1., 1.);
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let near = o * vec_near;
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let orig = o * vec_orig;
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let far = o * vec_far;
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assert_eq!(near, Vector4::new(-1f32, -1., 1., 1.));
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assert_eq!(orig, Vector4::new(0f32, 0., 0., 1.));
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assert_eq!(far, Vector4::new(1f32, 1., -1., 1.));
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let o: Matrix4<f32> = ortho(-2., 2., -2., 2., -2., 2.);
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let near = o * vec_near;
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let orig = o * vec_orig;
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let far = o * vec_far;
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assert_eq!(near, Vector4::new(-0.5f32, -0.5, 0.5, 1.));
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assert_eq!(orig, Vector4::new(0f32, 0., 0., 1.));
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assert_eq!(far, Vector4::new(0.5f32, 0.5, -0.5, 1.));
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}
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#[test]
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fn test_ortho_translate() {
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// An orthographic projection can be used to translate a point
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// but this will result in the clip space (Z) being swapped (-1 -> 1)
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// this test asserts that this property is true of our ortho projection
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let vec_orig: Vector4<f32> = Vector4::new(0., 0., 0., 1.);
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let o: Matrix4<f32> = ortho(-1., 1., -1., 1., -1., 1.);
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let orig = o * vec_orig;
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assert_eq!(orig, Vector4::new(0., 0., 0., 1.));
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let o: Matrix4<f32> = ortho(0., 2., 0., 2., 0., 2.);
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let orig = o * vec_orig;
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assert_eq!(orig, Vector4::new(-1., -1., -1., 1.));
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let o: Matrix4<f32> = ortho(-2., 0., -2., 0., -2., 0.);
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let orig = o * vec_orig;
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assert_eq!(orig, Vector4::new(1., 1., 1., 1.));
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}
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