1 /*
2 * Copyright 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "HalfTest"
18
19 #include <math.h>
20 #include <stdlib.h>
21
22 #include <math/half.h>
23 #include <math/vec4.h>
24
25 #include <gtest/gtest.h>
26
27 namespace android {
28
29 class HalfTest : public testing::Test {
30 protected:
31 };
32
TEST_F(HalfTest,Basics)33 TEST_F(HalfTest, Basics) {
34
35 EXPECT_EQ(2UL, sizeof(half));
36
37 // test +/- zero
38 EXPECT_EQ(0x0000, half().getBits());
39 EXPECT_EQ(0x0000, half( 0.0f).getBits());
40 EXPECT_EQ(0x8000, half(-0.0f).getBits());
41
42 // test nan
43 EXPECT_EQ(0x7e00, half(NAN).getBits());
44
45 // test +/- infinity
46 EXPECT_EQ(0x7C00, half( std::numeric_limits<float>::infinity()).getBits());
47 EXPECT_EQ(0xFC00, half(-std::numeric_limits<float>::infinity()).getBits());
48
49 // test a few known values
50 EXPECT_EQ(0x3C01, half(1.0009765625).getBits());
51 EXPECT_EQ(0xC000, half(-2).getBits());
52 EXPECT_EQ(0x0400, half(6.10352e-5).getBits());
53 EXPECT_EQ(0x7BFF, half(65504).getBits());
54 EXPECT_EQ(0x3555, half(1.0f/3).getBits());
55
56 // numeric limits
57 EXPECT_EQ(0x7C00, std::numeric_limits<half>::infinity().getBits());
58 EXPECT_EQ(0x0400, std::numeric_limits<half>::min().getBits());
59 EXPECT_EQ(0x7BFF, std::numeric_limits<half>::max().getBits());
60 EXPECT_EQ(0xFBFF, std::numeric_limits<half>::lowest().getBits());
61
62 // denormals (flushed to zero)
63 EXPECT_EQ(0x0000, half( 6.09756e-5).getBits()); // if handled, should be: 0x03FF
64 EXPECT_EQ(0x0000, half( 5.96046e-8).getBits()); // if handled, should be: 0x0001
65 EXPECT_EQ(0x8000, half(-6.09756e-5).getBits()); // if handled, should be: 0x83FF
66 EXPECT_EQ(0x8000, half(-5.96046e-8).getBits()); // if handled, should be: 0x8001
67
68 // test all exactly representable integers
69 for (int i=-2048 ; i<= 2048 ; ++i) {
70 half h = i;
71 EXPECT_EQ(i, float(h));
72 }
73 }
74
TEST_F(HalfTest,Literals)75 TEST_F(HalfTest, Literals) {
76 half one = 1.0_hf;
77 half pi = 3.1415926_hf;
78 half minusTwo = -2.0_hf;
79
80 EXPECT_EQ(half(1.0f), one);
81 EXPECT_EQ(half(3.1415926), pi);
82 EXPECT_EQ(half(-2.0f), minusTwo);
83 }
84
85
TEST_F(HalfTest,Vec)86 TEST_F(HalfTest, Vec) {
87 float4 f4(1,2,3,4);
88 half4 h4(f4);
89 half3 h3(f4.xyz);
90 half2 h2(f4.xy);
91
92 EXPECT_EQ(f4, h4);
93 EXPECT_EQ(f4.xyz, h3);
94 EXPECT_EQ(f4.xy, h2);
95 }
96
97
TEST_F(HalfTest,Hash)98 TEST_F(HalfTest, Hash) {
99 float4 f4a(1,2,3,4);
100 float4 f4b(2,2,3,4);
101 half4 h4a(f4a), h4b(f4b);
102
103 EXPECT_NE(std::hash<half4>{}(h4a), std::hash<half4>{}(h4b));
104 }
105
106 }; // namespace android
107