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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// 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 "ShaderCore.hpp"
#include "Device/Renderer.hpp"
#include "Vulkan/VkDebug.hpp"
#include <limits.h>
namespace sw
{
Vector4s::Vector4s()
{
}
Vector4s::Vector4s(unsigned short x, unsigned short y, unsigned short z, unsigned short w)
{
this->x = Short4(x);
this->y = Short4(y);
this->z = Short4(z);
this->w = Short4(w);
}
Vector4s::Vector4s(const Vector4s &rhs)
{
x = rhs.x;
y = rhs.y;
z = rhs.z;
w = rhs.w;
}
Vector4s &Vector4s::operator=(const Vector4s &rhs)
{
x = rhs.x;
y = rhs.y;
z = rhs.z;
w = rhs.w;
return *this;
}
Short4 &Vector4s::operator[](int i)
{
switch(i)
{
case 0: return x;
case 1: return y;
case 2: return z;
case 3: return w;
}
return x;
}
Vector4f::Vector4f()
{
}
Vector4f::Vector4f(float x, float y, float z, float w)
{
this->x = Float4(x);
this->y = Float4(y);
this->z = Float4(z);
this->w = Float4(w);
}
Vector4f::Vector4f(const Vector4f &rhs)
{
x = rhs.x;
y = rhs.y;
z = rhs.z;
w = rhs.w;
}
Vector4f &Vector4f::operator=(const Vector4f &rhs)
{
x = rhs.x;
y = rhs.y;
z = rhs.z;
w = rhs.w;
return *this;
}
Float4 &Vector4f::operator[](int i)
{
switch(i)
{
case 0: return x;
case 1: return y;
case 2: return z;
case 3: return w;
}
return x;
}
Float4 exponential2(RValue<Float4> x, bool pp)
{
// This implementation is based on 2^(i + f) = 2^i * 2^f,
// where i is the integer part of x and f is the fraction.
// For 2^i we can put the integer part directly in the exponent of
// the IEEE-754 floating-point number. Clamp to prevent overflow
// past the representation of infinity.
Float4 x0 = x;
x0 = Min(x0, As<Float4>(Int4(0x43010000))); // 129.00000e+0f
x0 = Max(x0, As<Float4>(Int4(0xC2FDFFFF))); // -126.99999e+0f
Int4 i = RoundInt(x0 - Float4(0.5f));
Float4 ii = As<Float4>((i + Int4(127)) << 23); // Add single-precision bias, and shift into exponent.
// For the fractional part use a polynomial
// which approximates 2^f in the 0 to 1 range.
Float4 f = x0 - Float4(i);
Float4 ff = As<Float4>(Int4(0x3AF61905)); // 1.8775767e-3f
ff = ff * f + As<Float4>(Int4(0x3C134806)); // 8.9893397e-3f
ff = ff * f + As<Float4>(Int4(0x3D64AA23)); // 5.5826318e-2f
ff = ff * f + As<Float4>(Int4(0x3E75EAD4)); // 2.4015361e-1f
ff = ff * f + As<Float4>(Int4(0x3F31727B)); // 6.9315308e-1f
ff = ff * f + Float4(1.0f);
return ii * ff;
}
Float4 logarithm2(RValue<Float4> x, bool pp)
{
Float4 x0;
Float4 x1;
Float4 x2;
Float4 x3;
x0 = x;
x1 = As<Float4>(As<Int4>(x0) & Int4(0x7F800000));
x1 = As<Float4>(As<UInt4>(x1) >> 8);
x1 = As<Float4>(As<Int4>(x1) | As<Int4>(Float4(1.0f)));
x1 = (x1 - Float4(1.4960938f)) * Float4(256.0f); // FIXME: (x1 - 1.4960938f) * 256.0f;
x0 = As<Float4>((As<Int4>(x0) & Int4(0x007FFFFF)) | As<Int4>(Float4(1.0f)));
x2 = (Float4(9.5428179e-2f) * x0 + Float4(4.7779095e-1f)) * x0 + Float4(1.9782813e-1f);
x3 = ((Float4(1.6618466e-2f) * x0 + Float4(2.0350508e-1f)) * x0 + Float4(2.7382900e-1f)) * x0 + Float4(4.0496687e-2f);
x2 /= x3;
x1 += (x0 - Float4(1.0f)) * x2;
Int4 pos_inf_x = CmpEQ(As<Int4>(x), Int4(0x7F800000));
return As<Float4>((pos_inf_x & As<Int4>(x)) | (~pos_inf_x & As<Int4>(x1)));
}
Float4 exponential(RValue<Float4> x, bool pp)
{
// FIXME: Propagate the constant
return exponential2(Float4(1.44269504f) * x, pp); // 1/ln(2)
}
Float4 logarithm(RValue<Float4> x, bool pp)
{
// FIXME: Propagate the constant
return Float4(6.93147181e-1f) * logarithm2(x, pp); // ln(2)
}
Float4 power(RValue<Float4> x, RValue<Float4> y, bool pp)
{
Float4 log = logarithm2(x, pp);
log *= y;
return exponential2(log, pp);
}
Float4 reciprocal(RValue<Float4> x, bool pp, bool finite, bool exactAtPow2)
{
Float4 rcp = Rcp_pp(x, exactAtPow2);
if(!pp)
{
rcp = (rcp + rcp) - (x * rcp * rcp);
}
if(finite)
{
int big = 0x7F7FFFFF;
rcp = Min(rcp, Float4((float&)big));
}
return rcp;
}
Float4 reciprocalSquareRoot(RValue<Float4> x, bool absolute, bool pp)
{
Float4 abs = x;
if(absolute)
{
abs = Abs(abs);
}
Float4 rsq;
if(!pp)
{
rsq = Float4(1.0f) / Sqrt(abs);
}
else
{
rsq = RcpSqrt_pp(abs);
if(!pp)
{
rsq = rsq * (Float4(3.0f) - rsq * rsq * abs) * Float4(0.5f);
}
rsq = As<Float4>(CmpNEQ(As<Int4>(abs), Int4(0x7F800000)) & As<Int4>(rsq));
}
return rsq;
}
Float4 modulo(RValue<Float4> x, RValue<Float4> y)
{
return x - y * Floor(x / y);
}
Float4 sine_pi(RValue<Float4> x, bool pp)
{
const Float4 A = Float4(-4.05284734e-1f); // -4/pi^2
const Float4 B = Float4(1.27323954e+0f); // 4/pi
const Float4 C = Float4(7.75160950e-1f);
const Float4 D = Float4(2.24839049e-1f);
// Parabola approximating sine
Float4 sin = x * (Abs(x) * A + B);
// Improve precision from 0.06 to 0.001
if(true)
{
sin = sin * (Abs(sin) * D + C);
}
return sin;
}
Float4 cosine_pi(RValue<Float4> x, bool pp)
{
// cos(x) = sin(x + pi/2)
Float4 y = x + Float4(1.57079632e+0f);
// Wrap around
y -= As<Float4>(CmpNLT(y, Float4(3.14159265e+0f)) & As<Int4>(Float4(6.28318530e+0f)));
return sine_pi(y, pp);
}
Float4 sine(RValue<Float4> x, bool pp)
{
// Reduce to [-0.5, 0.5] range
Float4 y = x * Float4(1.59154943e-1f); // 1/2pi
y = y - Round(y);
if(!pp)
{
// From the paper: "A Fast, Vectorizable Algorithm for Producing Single-Precision Sine-Cosine Pairs"
// This implementation passes OpenGL ES 3.0 precision requirements, at the cost of more operations:
// !pp : 17 mul, 7 add, 1 sub, 1 reciprocal
// pp : 4 mul, 2 add, 2 abs
Float4 y2 = y * y;
Float4 c1 = y2 * (y2 * (y2 * Float4(-0.0204391631f) + Float4(0.2536086171f)) + Float4(-1.2336977925f)) + Float4(1.0f);
Float4 s1 = y * (y2 * (y2 * (y2 * Float4(-0.0046075748f) + Float4(0.0796819754f)) + Float4(-0.645963615f)) + Float4(1.5707963235f));
Float4 c2 = (c1 * c1) - (s1 * s1);
Float4 s2 = Float4(2.0f) * s1 * c1;
return Float4(2.0f) * s2 * c2 * reciprocal(s2 * s2 + c2 * c2, pp, true);
}
const Float4 A = Float4(-16.0f);
const Float4 B = Float4(8.0f);
const Float4 C = Float4(7.75160950e-1f);
const Float4 D = Float4(2.24839049e-1f);
// Parabola approximating sine
Float4 sin = y * (Abs(y) * A + B);
// Improve precision from 0.06 to 0.001
if(true)
{
sin = sin * (Abs(sin) * D + C);
}
return sin;
}
Float4 cosine(RValue<Float4> x, bool pp)
{
// cos(x) = sin(x + pi/2)
Float4 y = x + Float4(1.57079632e+0f);
return sine(y, pp);
}
Float4 tangent(RValue<Float4> x, bool pp)
{
return sine(x, pp) / cosine(x, pp);
}
Float4 arccos(RValue<Float4> x, bool pp)
{
// pi/2 - arcsin(x)
return Float4(1.57079632e+0f) - arcsin(x);
}
Float4 arcsin(RValue<Float4> x, bool pp)
{
if(false) // Simpler implementation fails even lowp precision tests
{
// x*(pi/2-sqrt(1-x*x)*pi/5)
return x * (Float4(1.57079632e+0f) - Sqrt(Float4(1.0f) - x*x) * Float4(6.28318531e-1f));
}
else
{
// From 4.4.45, page 81 of the Handbook of Mathematical Functions, by Milton Abramowitz and Irene Stegun
const Float4 half_pi(1.57079632f);
const Float4 a0(1.5707288f);
const Float4 a1(-0.2121144f);
const Float4 a2(0.0742610f);
const Float4 a3(-0.0187293f);
Float4 absx = Abs(x);
return As<Float4>(As<Int4>(half_pi - Sqrt(Float4(1.0f) - absx) * (a0 + absx * (a1 + absx * (a2 + absx * a3)))) ^
(As<Int4>(x) & Int4(0x80000000)));
}
}
// Approximation of atan in [0..1]
Float4 arctan_01(Float4 x, bool pp)
{
if(pp)
{
return x * (Float4(-0.27f) * x + Float4(1.05539816f));
}
else
{
// From 4.4.49, page 81 of the Handbook of Mathematical Functions, by Milton Abramowitz and Irene Stegun
const Float4 a2(-0.3333314528f);
const Float4 a4(0.1999355085f);
const Float4 a6(-0.1420889944f);
const Float4 a8(0.1065626393f);
const Float4 a10(-0.0752896400f);
const Float4 a12(0.0429096138f);
const Float4 a14(-0.0161657367f);
const Float4 a16(0.0028662257f);
Float4 x2 = x * x;
return (x + x * (x2 * (a2 + x2 * (a4 + x2 * (a6 + x2 * (a8 + x2 * (a10 + x2 * (a12 + x2 * (a14 + x2 * a16)))))))));
}
}
Float4 arctan(RValue<Float4> x, bool pp)
{
Float4 absx = Abs(x);
Int4 O = CmpNLT(absx, Float4(1.0f));
Float4 y = As<Float4>((O & As<Int4>(Float4(1.0f) / absx)) | (~O & As<Int4>(absx))); // FIXME: Vector select
const Float4 half_pi(1.57079632f);
Float4 theta = arctan_01(y, pp);
return As<Float4>(((O & As<Int4>(half_pi - theta)) | (~O & As<Int4>(theta))) ^ // FIXME: Vector select
(As<Int4>(x) & Int4(0x80000000)));
}
Float4 arctan(RValue<Float4> y, RValue<Float4> x, bool pp)
{
const Float4 pi(3.14159265f); // pi
const Float4 minus_pi(-3.14159265f); // -pi
const Float4 half_pi(1.57079632f); // pi/2
const Float4 quarter_pi(7.85398163e-1f); // pi/4
// Rotate to upper semicircle when in lower semicircle
Int4 S = CmpLT(y, Float4(0.0f));
Float4 theta = As<Float4>(S & As<Int4>(minus_pi));
Float4 x0 = As<Float4>((As<Int4>(y) & Int4(0x80000000)) ^ As<Int4>(x));
Float4 y0 = Abs(y);
// Rotate to right quadrant when in left quadrant
Int4 Q = CmpLT(x0, Float4(0.0f));
theta += As<Float4>(Q & As<Int4>(half_pi));
Float4 x1 = As<Float4>((Q & As<Int4>(y0)) | (~Q & As<Int4>(x0))); // FIXME: Vector select
Float4 y1 = As<Float4>((Q & As<Int4>(-x0)) | (~Q & As<Int4>(y0))); // FIXME: Vector select
// Mirror to first octant when in second octant
Int4 O = CmpNLT(y1, x1);
Float4 x2 = As<Float4>((O & As<Int4>(y1)) | (~O & As<Int4>(x1))); // FIXME: Vector select
Float4 y2 = As<Float4>((O & As<Int4>(x1)) | (~O & As<Int4>(y1))); // FIXME: Vector select
// Approximation of atan in [0..1]
Int4 zero_x = CmpEQ(x2, Float4(0.0f));
Int4 inf_y = IsInf(y2); // Since x2 >= y2, this means x2 == y2 == inf, so we use 45 degrees or pi/4
Float4 atan2_theta = arctan_01(y2 / x2, pp);
theta += As<Float4>((~zero_x & ~inf_y & ((O & As<Int4>(half_pi - atan2_theta)) | (~O & (As<Int4>(atan2_theta))))) | // FIXME: Vector select
(inf_y & As<Int4>(quarter_pi)));
// Recover loss of precision for tiny theta angles
Int4 precision_loss = S & Q & O & ~inf_y; // This combination results in (-pi + half_pi + half_pi - atan2_theta) which is equivalent to -atan2_theta
return As<Float4>((precision_loss & As<Int4>(-atan2_theta)) | (~precision_loss & As<Int4>(theta))); // FIXME: Vector select
}
Float4 sineh(RValue<Float4> x, bool pp)
{
return (exponential(x, pp) - exponential(-x, pp)) * Float4(0.5f);
}
Float4 cosineh(RValue<Float4> x, bool pp)
{
return (exponential(x, pp) + exponential(-x, pp)) * Float4(0.5f);
}
Float4 tangenth(RValue<Float4> x, bool pp)
{
Float4 e_x = exponential(x, pp);
Float4 e_minus_x = exponential(-x, pp);
return (e_x - e_minus_x) / (e_x + e_minus_x);
}
Float4 arccosh(RValue<Float4> x, bool pp)
{
return logarithm(x + Sqrt(x + Float4(1.0f)) * Sqrt(x - Float4(1.0f)), pp);
}
Float4 arcsinh(RValue<Float4> x, bool pp)
{
return logarithm(x + Sqrt(x * x + Float4(1.0f)), pp);
}
Float4 arctanh(RValue<Float4> x, bool pp)
{
return logarithm((Float4(1.0f) + x) / (Float4(1.0f) - x), pp) * Float4(0.5f);
}
Float4 dot2(const Vector4f &v0, const Vector4f &v1)
{
return v0.x * v1.x + v0.y * v1.y;
}
Float4 dot3(const Vector4f &v0, const Vector4f &v1)
{
return v0.x * v1.x + v0.y * v1.y + v0.z * v1.z;
}
Float4 dot4(const Vector4f &v0, const Vector4f &v1)
{
return v0.x * v1.x + v0.y * v1.y + v0.z * v1.z + v0.w * v1.w;
}
void transpose4x4(Short4 &row0, Short4 &row1, Short4 &row2, Short4 &row3)
{
Int2 tmp0 = UnpackHigh(row0, row1);
Int2 tmp1 = UnpackHigh(row2, row3);
Int2 tmp2 = UnpackLow(row0, row1);
Int2 tmp3 = UnpackLow(row2, row3);
row0 = UnpackLow(tmp2, tmp3);
row1 = UnpackHigh(tmp2, tmp3);
row2 = UnpackLow(tmp0, tmp1);
row3 = UnpackHigh(tmp0, tmp1);
}
void transpose4x3(Short4 &row0, Short4 &row1, Short4 &row2, Short4 &row3)
{
Int2 tmp0 = UnpackHigh(row0, row1);
Int2 tmp1 = UnpackHigh(row2, row3);
Int2 tmp2 = UnpackLow(row0, row1);
Int2 tmp3 = UnpackLow(row2, row3);
row0 = UnpackLow(tmp2, tmp3);
row1 = UnpackHigh(tmp2, tmp3);
row2 = UnpackLow(tmp0, tmp1);
}
void transpose4x4(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3)
{
Float4 tmp0 = UnpackLow(row0, row1);
Float4 tmp1 = UnpackLow(row2, row3);
Float4 tmp2 = UnpackHigh(row0, row1);
Float4 tmp3 = UnpackHigh(row2, row3);
row0 = Float4(tmp0.xy, tmp1.xy);
row1 = Float4(tmp0.zw, tmp1.zw);
row2 = Float4(tmp2.xy, tmp3.xy);
row3 = Float4(tmp2.zw, tmp3.zw);
}
void transpose4x3(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3)
{
Float4 tmp0 = UnpackLow(row0, row1);
Float4 tmp1 = UnpackLow(row2, row3);
Float4 tmp2 = UnpackHigh(row0, row1);
Float4 tmp3 = UnpackHigh(row2, row3);
row0 = Float4(tmp0.xy, tmp1.xy);
row1 = Float4(tmp0.zw, tmp1.zw);
row2 = Float4(tmp2.xy, tmp3.xy);
}
void transpose4x2(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3)
{
Float4 tmp0 = UnpackLow(row0, row1);
Float4 tmp1 = UnpackLow(row2, row3);
row0 = Float4(tmp0.xy, tmp1.xy);
row1 = Float4(tmp0.zw, tmp1.zw);
}
void transpose4x1(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3)
{
Float4 tmp0 = UnpackLow(row0, row1);
Float4 tmp1 = UnpackLow(row2, row3);
row0 = Float4(tmp0.xy, tmp1.xy);
}
void transpose2x4(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3)
{
Float4 tmp01 = UnpackLow(row0, row1);
Float4 tmp23 = UnpackHigh(row0, row1);
row0 = tmp01;
row1 = Float4(tmp01.zw, row1.zw);
row2 = tmp23;
row3 = Float4(tmp23.zw, row3.zw);
}
void transpose4xN(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3, int N)
{
switch(N)
{
case 1: transpose4x1(row0, row1, row2, row3); break;
case 2: transpose4x2(row0, row1, row2, row3); break;
case 3: transpose4x3(row0, row1, row2, row3); break;
case 4: transpose4x4(row0, row1, row2, row3); break;
}
}
UInt4 halfToFloatBits(UInt4 halfBits)
{
auto magic = UInt4(126 << 23);
auto sign16 = halfBits & UInt4(0x8000);
auto man16 = halfBits & UInt4(0x3FF);
auto exp16 = halfBits & UInt4(0x7C00);
auto isDnormOrZero = CmpEQ(exp16, UInt4(0));
auto isInfOrNaN = CmpEQ(exp16, UInt4(0x7C00));
auto sign32 = sign16 << 16;
auto man32 = man16 << 13;
auto exp32 = (exp16 + UInt4(0x1C000)) << 13;
auto norm32 = (man32 | exp32) | (isInfOrNaN & UInt4(0x7F800000));
auto denorm32 = As<UInt4>(As<Float4>(magic + man16) - As<Float4>(magic));
return sign32 | (norm32 & ~isDnormOrZero) | (denorm32 & isDnormOrZero);
}
}