1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "src/mesh.h"
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <stdint.h>
#include <ostream>
#include <string>
#include "src/util.h"
#include "third_party/abseil/absl/strings/substitute.h"
namespace glplanet {
namespace {
using Coordinates = ::glplanet::UvSphere::Coordinates;
using ::testing::ElementsAre;
using ::testing::ExplainMatchResult;
using ::testing::Field;
using ::testing::FloatNear;
using ::testing::UnorderedElementsAre;
struct Triangle {
uint32_t a, b, c;
std::string DebugString() const noexcept {
return absl::Substitute("Triangle{$0, $1, $2}", a, b, c);
}
};
std::ostream& operator<<(std::ostream& out, const Triangle& t) noexcept {
return out << t.DebugString();
}
std::vector<Triangle> TrianglesIn(const std::vector<uint32_t>& elements) {
DCHECK(elements.size() % 3 == 0);
std::vector<Triangle> result;
for (int i = 0; i < elements.size(); i += 3) {
result.push_back(Triangle{elements[i], elements[i + 1], elements[i + 2]});
}
return result;
}
MATCHER_P5(CoordinatesAre, xv, yv, zv, uv, vv,
absl::Substitute("is an object whose fields (x, y, z, u, v) are "
"approximately ($0, $1, $2, $3, $4)",
xv, yv, zv, uv, vv)) {
return ExplainMatchResult(
AllOf(Field("x", &Coordinates::x, FloatNear(xv, 1e-15)),
Field("y", &Coordinates::y, FloatNear(yv, 1e-15)),
Field("z", &Coordinates::z, FloatNear(zv, 1e-15)),
Field("u", &Coordinates::u, FloatNear(uv, 1e-15)),
Field("v", &Coordinates::v, FloatNear(vv, 1e-15))),
arg, result_listener);
}
MATCHER_P3(TriangleIs, av, bv, cv,
absl::Substitute("is the triangle ($0, $1, $2)", av, bv, cv)) {
return arg.a == av && arg.b == bv && arg.c == cv;
}
TEST(MeshTest, SmallVertices) {
// This test is overconstrained. In particular, we check the returned
// coordinates with ElementsAre, rather than UnorderedElementsAre, and the u
// coordinates are exact, rather than being normalized to [0, 1]. This allows
// us to verify that the u coordinates increase monotonically as we travel
// east around the sphere, which is important to prevent discontinuities in
// texture mapping.
UvSphere s(4, 2);
EXPECT_THAT(s.vertices, ElementsAre(CoordinatesAre(0, 0, -1, 0, 1), //
CoordinatesAre(0, 0, -1, 0.25, 1), //
CoordinatesAre(0, 0, -1, 0.5, 1), //
CoordinatesAre(0, 0, -1, 0.75, 1), //
CoordinatesAre(0, 0, -1, 1, 1),
CoordinatesAre(-1, 0, 0, 0, 0.5), //
CoordinatesAre(0, -1, 0, 0.25, 0.5), //
CoordinatesAre(1, 0, 0, 0.5, 0.5), //
CoordinatesAre(0, 1, 0, 0.75, 0.5), //
CoordinatesAre(-1, 0, 0, 1, 0.5),
CoordinatesAre(0, 0, 1, 0, 0), //
CoordinatesAre(0, 0, 1, 0.25, 0), //
CoordinatesAre(0, 0, 1, 0.5, 0), //
CoordinatesAre(0, 0, 1, 0.75, 0), //
CoordinatesAre(0, 0, 1, 1, 0)));
}
TEST(MeshTest, SmallElements) {
UvSphere s(4, 2);
ASSERT_THAT(s.vertices, ElementsAre(CoordinatesAre(0, 0, -1, 0, 1), //
CoordinatesAre(0, 0, -1, 0.25, 1), //
CoordinatesAre(0, 0, -1, 0.5, 1), //
CoordinatesAre(0, 0, -1, 0.75, 1), //
CoordinatesAre(0, 0, -1, 1, 1),
CoordinatesAre(-1, 0, 0, 0, 0.5), //
CoordinatesAre(0, -1, 0, 0.25, 0.5), //
CoordinatesAre(1, 0, 0, 0.5, 0.5), //
CoordinatesAre(0, 1, 0, 0.75, 0.5), //
CoordinatesAre(-1, 0, 0, 1, 0.5),
CoordinatesAre(0, 0, 1, 0, 0), //
CoordinatesAre(0, 0, 1, 0.25, 0), //
CoordinatesAre(0, 0, 1, 0.5, 0), //
CoordinatesAre(0, 0, 1, 0.75, 0), //
CoordinatesAre(0, 0, 1, 1, 0)));
EXPECT_THAT(
TrianglesIn(s.elements),
UnorderedElementsAre(TriangleIs(0, 6, 5), TriangleIs(1, 6, 0), //
TriangleIs(1, 7, 6), TriangleIs(2, 7, 1), //
TriangleIs(2, 8, 7), TriangleIs(3, 8, 2), //
TriangleIs(3, 9, 8), TriangleIs(4, 9, 3),
TriangleIs(5, 11, 10), TriangleIs(6, 11, 5), //
TriangleIs(6, 12, 11), TriangleIs(7, 12, 6), //
TriangleIs(7, 13, 12), TriangleIs(8, 13, 7), //
TriangleIs(8, 14, 13), TriangleIs(9, 14, 8)));
}
} // namespace
} // namespace glplanet
|
