8cd44fb2e8
We introduce a templated fp<> class that can represent any float format and convert to/from float32.
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/*
|
|
* Copyright (C) 2016 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.
|
|
*/
|
|
|
|
#include <math.h>
|
|
|
|
#include <gtest/gtest.h>
|
|
|
|
#include <math/half.h>
|
|
#include <math/vec4.h>
|
|
|
|
using namespace filament::math;
|
|
|
|
class HalfTest : public testing::Test {
|
|
protected:
|
|
};
|
|
|
|
TEST_F(HalfTest, Basics) {
|
|
|
|
EXPECT_EQ(2, sizeof(half));
|
|
|
|
// test +/- zero
|
|
EXPECT_EQ(0x0000, getBits(half( 0.0f)));
|
|
EXPECT_EQ(0x8000, getBits(half(-0.0f)));
|
|
|
|
// test nan
|
|
EXPECT_EQ(0x7e00, getBits(half(NAN)));
|
|
|
|
// test +/- infinity
|
|
EXPECT_EQ(0x7C00, getBits(half( std::numeric_limits<float>::infinity())));
|
|
EXPECT_EQ(0xFC00, getBits(half(-std::numeric_limits<float>::infinity())));
|
|
|
|
// test a few known values
|
|
EXPECT_EQ(0x3C01, getBits(half(1.0009765625)));
|
|
EXPECT_EQ(0xC000, getBits(half(-2)));
|
|
EXPECT_EQ(0x0400, getBits(half(6.10352e-5)));
|
|
EXPECT_EQ(0x7BFF, getBits(half(65504)));
|
|
EXPECT_EQ(0x3555, getBits(half(1.0f/3)));
|
|
|
|
// numeric limits
|
|
EXPECT_EQ(0x7C00, getBits(std::numeric_limits<half>::infinity()));
|
|
EXPECT_EQ(0x0400, getBits(std::numeric_limits<half>::min()));
|
|
EXPECT_EQ(0x7BFF, getBits(std::numeric_limits<half>::max()));
|
|
EXPECT_EQ(0xFBFF, getBits(std::numeric_limits<half>::lowest()));
|
|
|
|
// denormals
|
|
EXPECT_EQ(0x03FF, getBits(half( 6.09756e-5))); // if handled, should be: 0x03FF
|
|
EXPECT_EQ(0x0001, getBits(half( 5.96046e-8))); // if handled, should be: 0x0001
|
|
EXPECT_EQ(0x83FF, getBits(half(-6.09756e-5))); // if handled, should be: 0x83FF
|
|
EXPECT_EQ(0x8001, getBits(half(-5.96046e-8))); // if handled, should be: 0x8001
|
|
|
|
// test all exactly representable integers
|
|
#pragma nounroll
|
|
for (int i = -2048; i <= 2048; ++i) {
|
|
half h = float(i);
|
|
EXPECT_EQ(i, float(h));
|
|
}
|
|
}
|
|
|
|
TEST_F(HalfTest, Literals) {
|
|
half one = 1.0_h;
|
|
half pi = 3.1415926_h;
|
|
half minusTwo = -2.0_h;
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
using fp10 = fp<0, 5, 5>;
|
|
using fp11 = fp<0, 5, 6>;
|
|
|
|
TEST_F(HalfTest, fp10) {
|
|
// test all exactly representable integers
|
|
#pragma nounroll
|
|
for (int i = 0; i <= 64; ++i) {
|
|
fp10 h = fp10::fromf(float(i));
|
|
EXPECT_EQ(i, fp10::tof(h));
|
|
}
|
|
}
|
|
|
|
TEST_F(HalfTest, fp11) {
|
|
// test all exactly representable integers
|
|
#pragma nounroll
|
|
for (int i = 0; i <= 128; ++i) {
|
|
fp11 h = fp11::fromf(float(i));
|
|
EXPECT_EQ(i, fp11::tof(h));
|
|
}
|
|
} |