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skia2/tests/SkNxTest.cpp
mtklein e4c0beed74 sknx refactoring 
- trim unused specializations (Sk4i, Sk2d) and apis (SkNx_dup)
  - expand apis a little
    * v[0] == v.kth<0>()
    * SkNx_shuffle can now convert to different-sized vectors, e.g. Sk2f <-> Sk4f
  - remove anonymous namespace

I believe it's safe to remove the anonymous namespace right now.
We're worried about violating the One Definition Rule; the anonymous namespace protected us from that.

In Release builds, this is mostly moot, as everything tends to inline completely.
In Debug builds, violating the ODR is at worst an inconvenience, time spent trying to figure out why the bot is broken.

Now that we're building with SSE2/NEON everywhere, very few bots have even a chance about getting confused by two definitions of the same type or function.  Where we do compile variants depending on, e.g., SSSE3, we do so in static inline functions.  These are not subject to the ODR.

I plan to follow up with a tedious .kth<...>() -> [...] auto-replace.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1683543002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Review URL: https://codereview.chromium.org/1683543002
2016-02-09 10:35:28 -08:00

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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Sk4px.h"
#include "SkNx.h"
#include "SkRandom.h"
#include "Test.h"
template <int N>
static void test_Nf(skiatest::Reporter* r) {
auto assert_nearly_eq = [&](float eps, const SkNx<N, float>& v,
float a, float b, float c, float d) {
auto close = [=](float a, float b) { return fabsf(a-b) <= eps; };
float vals[4];
v.store(vals);
bool ok = close(vals[0], a) && close(vals[1], b)
&& close(v.template kth<0>(), a) && close(v.template kth<1>(), b);
REPORTER_ASSERT(r, ok);
if (N == 4) {
ok = close(vals[2], c) && close(vals[3], d)
&& close(v.template kth<2>(), c) && close(v.template kth<3>(), d);
REPORTER_ASSERT(r, ok);
}
};
auto assert_eq = [&](const SkNx<N, float>& v, float a, float b, float c, float d) {
return assert_nearly_eq(0, v, a,b,c,d);
};
float vals[] = {3, 4, 5, 6};
SkNx<N,float> a = SkNx<N,float>::Load(vals),
b(a),
c = a;
SkNx<N,float> d;
d = a;
assert_eq(a, 3, 4, 5, 6);
assert_eq(b, 3, 4, 5, 6);
assert_eq(c, 3, 4, 5, 6);
assert_eq(d, 3, 4, 5, 6);
assert_eq(a+b, 6, 8, 10, 12);
assert_eq(a*b, 9, 16, 25, 36);
assert_eq(a*b-b, 6, 12, 20, 30);
assert_eq((a*b).sqrt(), 3, 4, 5, 6);
assert_eq(a/b, 1, 1, 1, 1);
assert_eq(SkNx<N,float>(0)-a, -3, -4, -5, -6);
SkNx<N,float> fours(4);
assert_eq(fours.sqrt(), 2,2,2,2);
assert_nearly_eq(0.001f, fours.rsqrt0(), 0.5, 0.5, 0.5, 0.5);
assert_nearly_eq(0.001f, fours.rsqrt1(), 0.5, 0.5, 0.5, 0.5);
assert_nearly_eq(0.001f, fours.rsqrt2(), 0.5, 0.5, 0.5, 0.5);
assert_eq( fours. invert(), 0.25, 0.25, 0.25, 0.25);
assert_nearly_eq(0.001f, fours.approxInvert(), 0.25, 0.25, 0.25, 0.25);
assert_eq(SkNx<N,float>::Min(a, fours), 3, 4, 4, 4);
assert_eq(SkNx<N,float>::Max(a, fours), 4, 4, 5, 6);
// Test some comparisons. This is not exhaustive.
REPORTER_ASSERT(r, (a == b).allTrue());
REPORTER_ASSERT(r, (a+b == a*b-b).anyTrue());
REPORTER_ASSERT(r, !(a+b == a*b-b).allTrue());
REPORTER_ASSERT(r, !(a+b == a*b).anyTrue());
REPORTER_ASSERT(r, !(a != b).anyTrue());
REPORTER_ASSERT(r, (a < fours).anyTrue());
REPORTER_ASSERT(r, (a <= fours).anyTrue());
REPORTER_ASSERT(r, !(a > fours).allTrue());
REPORTER_ASSERT(r, !(a >= fours).allTrue());
}
DEF_TEST(SkNf, r) {
test_Nf<2>(r);
test_Nf<4>(r);
}
template <int N, typename T>
void test_Ni(skiatest::Reporter* r) {
auto assert_eq = [&](const SkNx<N,T>& v, T a, T b, T c, T d, T e, T f, T g, T h) {
T vals[8];
v.store(vals);
switch (N) {
case 8: REPORTER_ASSERT(r, vals[4] == e && vals[5] == f && vals[6] == g && vals[7] == h);
case 4: REPORTER_ASSERT(r, vals[2] == c && vals[3] == d);
case 2: REPORTER_ASSERT(r, vals[0] == a && vals[1] == b);
}
switch (N) {
case 8: REPORTER_ASSERT(r, v.template kth<4>() == e && v.template kth<5>() == f &&
v.template kth<6>() == g && v.template kth<7>() == h);
case 4: REPORTER_ASSERT(r, v.template kth<2>() == c && v.template kth<3>() == d);
case 2: REPORTER_ASSERT(r, v.template kth<0>() == a && v.template kth<1>() == b);
}
};
T vals[] = { 1,2,3,4,5,6,7,8 };
SkNx<N,T> a = SkNx<N,T>::Load(vals),
b(a),
c = a;
SkNx<N,T> d;
d = a;
assert_eq(a, 1,2,3,4,5,6,7,8);
assert_eq(b, 1,2,3,4,5,6,7,8);
assert_eq(c, 1,2,3,4,5,6,7,8);
assert_eq(d, 1,2,3,4,5,6,7,8);
assert_eq(a+a, 2,4,6,8,10,12,14,16);
assert_eq(a*a, 1,4,9,16,25,36,49,64);
assert_eq(a*a-a, 0,2,6,12,20,30,42,56);
assert_eq(a >> 2, 0,0,0,1,1,1,1,2);
assert_eq(a << 1, 2,4,6,8,10,12,14,16);
REPORTER_ASSERT(r, a.template kth<1>() == 2);
}
DEF_TEST(SkNx, r) {
test_Ni<2, uint16_t>(r);
test_Ni<4, uint16_t>(r);
test_Ni<8, uint16_t>(r);
test_Ni<2, int>(r);
test_Ni<4, int>(r);
test_Ni<8, int>(r);
}
DEF_TEST(SkNi_min_lt, r) {
// Exhaustively check the 8x8 bit space.
for (int a = 0; a < (1<<8); a++) {
for (int b = 0; b < (1<<8); b++) {
Sk16b aw(a), bw(b);
REPORTER_ASSERT(r, Sk16b::Min(aw, bw).kth<0>() == SkTMin(a, b));
REPORTER_ASSERT(r, !(aw < bw).kth<0>() == !(a < b));
}}
// Exhausting the 16x16 bit space is kind of slow, so only do that in release builds.
#ifdef SK_DEBUG
SkRandom rand;
for (int i = 0; i < (1<<16); i++) {
uint16_t a = rand.nextU() >> 16,
b = rand.nextU() >> 16;
REPORTER_ASSERT(r, Sk16h::Min(Sk16h(a), Sk16h(b)).kth<0>() == SkTMin(a, b));
}
#else
for (int a = 0; a < (1<<16); a++) {
for (int b = 0; b < (1<<16); b++) {
REPORTER_ASSERT(r, Sk16h::Min(Sk16h(a), Sk16h(b)).kth<0>() == SkTMin(a, b));
}}
#endif
}
DEF_TEST(SkNi_saturatedAdd, r) {
for (int a = 0; a < (1<<8); a++) {
for (int b = 0; b < (1<<8); b++) {
int exact = a+b;
if (exact > 255) { exact = 255; }
if (exact < 0) { exact = 0; }
REPORTER_ASSERT(r, Sk16b(a).saturatedAdd(Sk16b(b)).kth<0>() == exact);
}
}
}
DEF_TEST(Sk4px_muldiv255round, r) {
for (int a = 0; a < (1<<8); a++) {
for (int b = 0; b < (1<<8); b++) {
int exact = (a*b+127)/255;
// Duplicate a and b 16x each.
auto av = Sk4px::DupAlpha(a),
bv = Sk4px::DupAlpha(b);
// This way should always be exactly correct.
int correct = (av * bv).div255().kth<0>();
REPORTER_ASSERT(r, correct == exact);
// We're a bit more flexible on this method: correct for 0 or 255, otherwise off by <=1.
int fast = av.approxMulDiv255(bv).kth<0>();
REPORTER_ASSERT(r, fast-exact >= -1 && fast-exact <= 1);
if (a == 0 || a == 255 || b == 0 || b == 255) {
REPORTER_ASSERT(r, fast == exact);
}
}
}
}
DEF_TEST(Sk4px_widening, r) {
SkPMColor colors[] = {
SkPreMultiplyColor(0xff00ff00),
SkPreMultiplyColor(0x40008000),
SkPreMultiplyColor(0x7f020406),
SkPreMultiplyColor(0x00000000),
};
auto packed = Sk4px::Load4(colors);
auto wideLo = packed.widenLo(),
wideHi = packed.widenHi(),
wideLoHi = packed.widenLoHi(),
wideLoHiAlt = wideLo + wideHi;
REPORTER_ASSERT(r, 0 == memcmp(&wideLoHi, &wideLoHiAlt, sizeof(wideLoHi)));
}
DEF_TEST(SkNx_abs, r) {
auto fs = Sk4f(0.0f, -0.0f, 2.0f, -4.0f).abs();
REPORTER_ASSERT(r, fs.kth<0>() == 0.0f);
REPORTER_ASSERT(r, fs.kth<1>() == 0.0f);
REPORTER_ASSERT(r, fs.kth<2>() == 2.0f);
REPORTER_ASSERT(r, fs.kth<3>() == 4.0f);
}
DEF_TEST(SkNx_shuffle, r) {
Sk4f f4(0,10,20,30);
Sk2f f2 = SkNx_shuffle<2,1>(f4);
REPORTER_ASSERT(r, f2[0] == 20);
REPORTER_ASSERT(r, f2[1] == 10);
f4 = SkNx_shuffle<0,1,1,0>(f2);
REPORTER_ASSERT(r, f4[0] == 20);
REPORTER_ASSERT(r, f4[1] == 10);
REPORTER_ASSERT(r, f4[2] == 10);
REPORTER_ASSERT(r, f4[3] == 20);
}
#include "SkRandom.h"
DEF_TEST(SkNx_u16_float, r) {
{
// u16 --> float
auto h4 = Sk4h(15, 17, 257, 65535);
auto f4 = SkNx_cast<float>(h4);
REPORTER_ASSERT(r, f4.kth<0>() == 15.0f);
REPORTER_ASSERT(r, f4.kth<1>() == 17.0f);
REPORTER_ASSERT(r, f4.kth<2>() == 257.0f);
REPORTER_ASSERT(r, f4.kth<3>() == 65535.0f);
}
{
// float -> u16
auto f4 = Sk4f(15, 17, 257, 65535);
auto h4 = SkNx_cast<uint16_t>(f4);
REPORTER_ASSERT(r, h4.kth<0>() == 15);
REPORTER_ASSERT(r, h4.kth<1>() == 17);
REPORTER_ASSERT(r, h4.kth<2>() == 257);
REPORTER_ASSERT(r, h4.kth<3>() == 65535);
}
// starting with any u16 value, we should be able to have a perfect round-trip in/out of floats
//
SkRandom rand;
for (int i = 0; i < 10000; ++i) {
const uint16_t s16[4] {
(uint16_t)rand.nextU16(), (uint16_t)rand.nextU16(),
(uint16_t)rand.nextU16(), (uint16_t)rand.nextU16(),
};
auto u4_0 = Sk4h::Load(s16);
auto f4 = SkNx_cast<float>(u4_0);
auto u4_1 = SkNx_cast<uint16_t>(f4);
uint16_t d16[4];
u4_1.store(d16);
REPORTER_ASSERT(r, !memcmp(s16, d16, sizeof(s16)));
}
}
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