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/*
* Copyright 2013 The Android Open Source Project
*
* 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
*
* http://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.
*/
#define LOG_TAG "HalfTest"
#include <math.h>
#include <stdlib.h>
#include <math/half.h>
#include <math/vec4.h>
#include <gtest/gtest.h>
namespace android {
class HalfTest : public testing::Test {
protected:
};
TEST_F(HalfTest, Basics) {
EXPECT_EQ(2UL, sizeof(half));
// test +/- zero
EXPECT_EQ(0x0000, half().getBits());
EXPECT_EQ(0x0000, half( 0.0f).getBits());
EXPECT_EQ(0x8000, half(-0.0f).getBits());
// test nan
EXPECT_EQ(0x7e00, half(NAN).getBits());
// test +/- infinity
EXPECT_EQ(0x7C00, half( std::numeric_limits<float>::infinity()).getBits());
EXPECT_EQ(0xFC00, half(-std::numeric_limits<float>::infinity()).getBits());
// test a few known values
EXPECT_EQ(0x3C01, half(1.0009765625).getBits());
EXPECT_EQ(0xC000, half(-2).getBits());
EXPECT_EQ(0x0400, half(6.10352e-5).getBits());
EXPECT_EQ(0x7BFF, half(65504).getBits());
EXPECT_EQ(0x3555, half(1.0f/3).getBits());
// numeric limits
EXPECT_EQ(0x7C00, std::numeric_limits<half>::infinity().getBits());
EXPECT_EQ(0x0400, std::numeric_limits<half>::min().getBits());
EXPECT_EQ(0x7BFF, std::numeric_limits<half>::max().getBits());
EXPECT_EQ(0xFBFF, std::numeric_limits<half>::lowest().getBits());
// denormals (flushed to zero)
EXPECT_EQ(0x0000, half( 6.09756e-5).getBits()); // if handled, should be: 0x03FF
EXPECT_EQ(0x0000, half( 5.96046e-8).getBits()); // if handled, should be: 0x0001
EXPECT_EQ(0x8000, half(-6.09756e-5).getBits()); // if handled, should be: 0x83FF
EXPECT_EQ(0x8000, half(-5.96046e-8).getBits()); // if handled, should be: 0x8001
// test all exactly representable integers
for (int i=-2048 ; i<= 2048 ; ++i) {
half h = i;
EXPECT_EQ(i, float(h));
}
}
TEST_F(HalfTest, Literals) {
half one = 1.0_hf;
half pi = 3.1415926_hf;
half minusTwo = -2.0_hf;
EXPECT_EQ(half(1.0f), one);
EXPECT_EQ(half(3.1415926), pi);
EXPECT_EQ(half(-2.0f), minusTwo);
}
TEST_F(HalfTest, Vec) {
float4 f4(1,2,3,4);
half4 h4(f4);
half3 h3(f4.xyz);
half2 h2(f4.xy);
EXPECT_EQ(f4, h4);
EXPECT_EQ(f4.xyz, h3);
EXPECT_EQ(f4.xy, h2);
}
TEST_F(HalfTest, Hash) {
float4 f4a(1,2,3,4);
float4 f4b(2,2,3,4);
half4 h4a(f4a), h4b(f4b);
EXPECT_NE(std::hash<half4>{}(h4a), std::hash<half4>{}(h4b));
}
}; // namespace android
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