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( 0.0f).getBits());
39 EXPECT_EQ(0x8000, half(-0.0f).getBits());
40
41 // test nan
42 EXPECT_EQ(0x7e00, half(NAN).getBits());
43
44 // test +/- infinity
45 EXPECT_EQ(0x7C00, half( std::numeric_limits<float>::infinity()).getBits());
46 EXPECT_EQ(0xFC00, half(-std::numeric_limits<float>::infinity()).getBits());
47
48 // test a few known values
49 EXPECT_EQ(0x3C01, half(1.0009765625).getBits());
50 EXPECT_EQ(0xC000, half(-2).getBits());
51 EXPECT_EQ(0x0400, half(6.10352e-5).getBits());
52 EXPECT_EQ(0x7BFF, half(65504).getBits());
53 EXPECT_EQ(0x3555, half(1.0f/3).getBits());
54
55 // numeric limits
56 EXPECT_EQ(0x7C00, std::numeric_limits<half>::infinity().getBits());
57 EXPECT_EQ(0x0400, std::numeric_limits<half>::min().getBits());
58 EXPECT_EQ(0x7BFF, std::numeric_limits<half>::max().getBits());
59 EXPECT_EQ(0xFBFF, std::numeric_limits<half>::lowest().getBits());
60
61 // denormals (flushed to zero)
62 EXPECT_EQ(0x0000, half( 6.09756e-5).getBits()); // if handled, should be: 0x03FF
63 EXPECT_EQ(0x0000, half( 5.96046e-8).getBits()); // if handled, should be: 0x0001
64 EXPECT_EQ(0x8000, half(-6.09756e-5).getBits()); // if handled, should be: 0x83FF
65 EXPECT_EQ(0x8000, half(-5.96046e-8).getBits()); // if handled, should be: 0x8001
66
67 // test all exactly representable integers
68 for (int i=-2048 ; i<= 2048 ; ++i) {
69 half h = i;
70 EXPECT_EQ(i, float(h));
71 }
72 }
73
TEST_F(HalfTest,Literals)74 TEST_F(HalfTest, Literals) {
75 half one = 1.0_hf;
76 half pi = 3.1415926_hf;
77 half minusTwo = -2.0_hf;
78
79 EXPECT_EQ(half(1.0f), one);
80 EXPECT_EQ(half(3.1415926), pi);
81 EXPECT_EQ(half(-2.0f), minusTwo);
82 }
83
84
TEST_F(HalfTest,Vec)85 TEST_F(HalfTest, Vec) {
86 float4 f4(1,2,3,4);
87 half4 h4(f4);
88 half3 h3(f4.xyz);
89 half2 h2(f4.xy);
90
91 EXPECT_EQ(f4, h4);
92 EXPECT_EQ(f4.xyz, h3);
93 EXPECT_EQ(f4.xy, h2);
94 }
95
96 }; // namespace android
97