Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1482 insertions, 0 deletions

diff --git a/gfx/angle/checkout/src/common/mathutil.h b/gfx/angle/checkout/src/common/mathutil.h
new file mode 100644
index 0000000000..560929239f
--- /dev/null
+++ b/gfx/angle/checkout/src/common/mathutil.h
@@ -0,0 +1,1482 @@
+//
+// Copyright 2002 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// mathutil.h: Math and bit manipulation functions.
+
+#ifndef COMMON_MATHUTIL_H_
+#define COMMON_MATHUTIL_H_
+
+#include <math.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <algorithm>
+#include <limits>
+
+#include <anglebase/numerics/safe_math.h>
+
+#include "common/debug.h"
+#include "common/platform.h"
+
+namespace angle
+{
+using base::CheckedNumeric;
+using base::IsValueInRangeForNumericType;
+}  // namespace angle
+
+namespace gl
+{
+
+const unsigned int Float32One   = 0x3F800000;
+const unsigned short Float16One = 0x3C00;
+
+template <typename T>
+inline constexpr bool isPow2(T x)
+{
+    static_assert(std::is_integral<T>::value, "isPow2 must be called on an integer type.");
+    return (x & (x - 1)) == 0 && (x != 0);
+}
+
+template <typename T>
+inline int log2(T x)
+{
+    static_assert(std::is_integral<T>::value, "log2 must be called on an integer type.");
+    int r = 0;
+    while ((x >> r) > 1)
+        r++;
+    return r;
+}
+
+inline unsigned int ceilPow2(unsigned int x)
+{
+    if (x != 0)
+        x--;
+    x |= x >> 1;
+    x |= x >> 2;
+    x |= x >> 4;
+    x |= x >> 8;
+    x |= x >> 16;
+    x++;
+
+    return x;
+}
+
+template <typename DestT, typename SrcT>
+inline DestT clampCast(SrcT value)
+{
+    // For floating-point types with denormalization, min returns the minimum positive normalized
+    // value. To find the value that has no values less than it, use numeric_limits::lowest.
+    constexpr const long double destLo =
+        static_cast<long double>(std::numeric_limits<DestT>::lowest());
+    constexpr const long double destHi =
+        static_cast<long double>(std::numeric_limits<DestT>::max());
+    constexpr const long double srcLo =
+        static_cast<long double>(std::numeric_limits<SrcT>::lowest());
+    constexpr long double srcHi = static_cast<long double>(std::numeric_limits<SrcT>::max());
+
+    if (destHi < srcHi)
+    {
+        DestT destMax = std::numeric_limits<DestT>::max();
+        if (value >= static_cast<SrcT>(destMax))
+        {
+            return destMax;
+        }
+    }
+
+    if (destLo > srcLo)
+    {
+        DestT destLow = std::numeric_limits<DestT>::lowest();
+        if (value <= static_cast<SrcT>(destLow))
+        {
+            return destLow;
+        }
+    }
+
+    return static_cast<DestT>(value);
+}
+
+// Specialize clampCast for bool->int conversion to avoid MSVS 2015 performance warning when the max
+// value is casted to the source type.
+template <>
+inline unsigned int clampCast(bool value)
+{
+    return static_cast<unsigned int>(value);
+}
+
+template <>
+inline int clampCast(bool value)
+{
+    return static_cast<int>(value);
+}
+
+template <typename T, typename MIN, typename MAX>
+inline T clamp(T x, MIN min, MAX max)
+{
+    // Since NaNs fail all comparison tests, a NaN value will default to min
+    return x > min ? (x > max ? max : x) : min;
+}
+
+template <typename T>
+T clampForBitCount(T value, size_t bitCount)
+{
+    static_assert(std::numeric_limits<T>::is_integer, "T must be an integer.");
+
+    if (bitCount == 0)
+    {
+        constexpr T kZero = 0;
+        return kZero;
+    }
+    ASSERT(bitCount <= sizeof(T) * 8);
+
+    constexpr bool kIsSigned = std::numeric_limits<T>::is_signed;
+    ASSERT((bitCount > 1) || !kIsSigned);
+
+    T min = 0;
+    T max = 0;
+    if (bitCount == sizeof(T) * 8)
+    {
+        min = std::numeric_limits<T>::min();
+        max = std::numeric_limits<T>::max();
+    }
+    else
+    {
+        constexpr T kOne = 1;
+        min              = (kIsSigned) ? -1 * (kOne << (bitCount - 1)) : 0;
+        max              = (kIsSigned) ? (kOne << (bitCount - 1)) - 1 : (kOne << bitCount) - 1;
+    }
+
+    return gl::clamp(value, min, max);
+}
+
+inline float clamp01(float x)
+{
+    return clamp(x, 0.0f, 1.0f);
+}
+
+template <const int n>
+inline unsigned int unorm(float x)
+{
+    const unsigned int max = 0xFFFFFFFF >> (32 - n);
+
+    if (x > 1)
+    {
+        return max;
+    }
+    else if (x < 0)
+    {
+        return 0;
+    }
+    else
+    {
+        return (unsigned int)(max * x + 0.5f);
+    }
+}
+
+inline bool supportsSSE2()
+{
+#if defined(ANGLE_USE_SSE)
+    static bool checked  = false;
+    static bool supports = false;
+
+    if (checked)
+    {
+        return supports;
+    }
+
+#    if defined(ANGLE_PLATFORM_WINDOWS) && !defined(_M_ARM) && !defined(_M_ARM64)
+    {
+        int info[4];
+        __cpuid(info, 0);
+
+        if (info[0] >= 1)
+        {
+            __cpuid(info, 1);
+
+            supports = (info[3] >> 26) & 1;
+        }
+    }
+#    endif  // defined(ANGLE_PLATFORM_WINDOWS) && !defined(_M_ARM) && !defined(_M_ARM64)
+    checked = true;
+    return supports;
+#else  // defined(ANGLE_USE_SSE)
+    return false;
+#endif
+}
+
+template <typename destType, typename sourceType>
+destType bitCast(const sourceType &source)
+{
+    size_t copySize = std::min(sizeof(destType), sizeof(sourceType));
+    destType output;
+    memcpy(&output, &source, copySize);
+    return output;
+}
+
+// https://stackoverflow.com/a/37581284
+template <typename T>
+static constexpr double normalize(T value)
+{
+    return value < 0 ? -static_cast<double>(value) / std::numeric_limits<T>::min()
+                     : static_cast<double>(value) / std::numeric_limits<T>::max();
+}
+
+inline unsigned short float32ToFloat16(float fp32)
+{
+    unsigned int fp32i = bitCast<unsigned int>(fp32);
+    unsigned int sign  = (fp32i & 0x80000000) >> 16;
+    unsigned int abs   = fp32i & 0x7FFFFFFF;
+
+    if (abs > 0x7F800000)
+    {  // NaN
+        return 0x7FFF;
+    }
+    else if (abs > 0x47FFEFFF)
+    {  // Infinity
+        return static_cast<uint16_t>(sign | 0x7C00);
+    }
+    else if (abs < 0x38800000)  // Denormal
+    {
+        unsigned int mantissa = (abs & 0x007FFFFF) | 0x00800000;
+        int e                 = 113 - (abs >> 23);
+
+        if (e < 24)
+        {
+            abs = mantissa >> e;
+        }
+        else
+        {
+            abs = 0;
+        }
+
+        return static_cast<unsigned short>(sign | (abs + 0x00000FFF + ((abs >> 13) & 1)) >> 13);
+    }
+    else
+    {
+        return static_cast<unsigned short>(
+            sign | (abs + 0xC8000000 + 0x00000FFF + ((abs >> 13) & 1)) >> 13);
+    }
+}
+
+float float16ToFloat32(unsigned short h);
+
+unsigned int convertRGBFloatsTo999E5(float red, float green, float blue);
+void convert999E5toRGBFloats(unsigned int input, float *red, float *green, float *blue);
+
+inline unsigned short float32ToFloat11(float fp32)
+{
+    const unsigned int float32MantissaMask     = 0x7FFFFF;
+    const unsigned int float32ExponentMask     = 0x7F800000;
+    const unsigned int float32SignMask         = 0x80000000;
+    const unsigned int float32ValueMask        = ~float32SignMask;
+    const unsigned int float32ExponentFirstBit = 23;
+    const unsigned int float32ExponentBias     = 127;
+
+    const unsigned short float11Max          = 0x7BF;
+    const unsigned short float11MantissaMask = 0x3F;
+    const unsigned short float11ExponentMask = 0x7C0;
+    const unsigned short float11BitMask      = 0x7FF;
+    const unsigned int float11ExponentBias   = 14;
+
+    const unsigned int float32Maxfloat11       = 0x477E0000;
+    const unsigned int float32MinNormfloat11   = 0x38800000;
+    const unsigned int float32MinDenormfloat11 = 0x35000080;
+
+    const unsigned int float32Bits = bitCast<unsigned int>(fp32);
+    const bool float32Sign         = (float32Bits & float32SignMask) == float32SignMask;
+
+    unsigned int float32Val = float32Bits & float32ValueMask;
+
+    if ((float32Val & float32ExponentMask) == float32ExponentMask)
+    {
+        // INF or NAN
+        if ((float32Val & float32MantissaMask) != 0)
+        {
+            return float11ExponentMask |
+                   (((float32Val >> 17) | (float32Val >> 11) | (float32Val >> 6) | (float32Val)) &
+                    float11MantissaMask);
+        }
+        else if (float32Sign)
+        {
+            // -INF is clamped to 0 since float11 is positive only
+            return 0;
+        }
+        else
+        {
+            return float11ExponentMask;
+        }
+    }
+    else if (float32Sign)
+    {
+        // float11 is positive only, so clamp to zero
+        return 0;
+    }
+    else if (float32Val > float32Maxfloat11)
+    {
+        // The number is too large to be represented as a float11, set to max
+        return float11Max;
+    }
+    else if (float32Val < float32MinDenormfloat11)
+    {
+        // The number is too small to be represented as a denormalized float11, set to 0
+        return 0;
+    }
+    else
+    {
+        if (float32Val < float32MinNormfloat11)
+        {
+            // The number is too small to be represented as a normalized float11
+            // Convert it to a denormalized value.
+            const unsigned int shift = (float32ExponentBias - float11ExponentBias) -
+                                       (float32Val >> float32ExponentFirstBit);
+            ASSERT(shift < 32);
+            float32Val =
+                ((1 << float32ExponentFirstBit) | (float32Val & float32MantissaMask)) >> shift;
+        }
+        else
+        {
+            // Rebias the exponent to represent the value as a normalized float11
+            float32Val += 0xC8000000;
+        }
+
+        return ((float32Val + 0xFFFF + ((float32Val >> 17) & 1)) >> 17) & float11BitMask;
+    }
+}
+
+inline unsigned short float32ToFloat10(float fp32)
+{
+    const unsigned int float32MantissaMask     = 0x7FFFFF;
+    const unsigned int float32ExponentMask     = 0x7F800000;
+    const unsigned int float32SignMask         = 0x80000000;
+    const unsigned int float32ValueMask        = ~float32SignMask;
+    const unsigned int float32ExponentFirstBit = 23;
+    const unsigned int float32ExponentBias     = 127;
+
+    const unsigned short float10Max          = 0x3DF;
+    const unsigned short float10MantissaMask = 0x1F;
+    const unsigned short float10ExponentMask = 0x3E0;
+    const unsigned short float10BitMask      = 0x3FF;
+    const unsigned int float10ExponentBias   = 14;
+
+    const unsigned int float32Maxfloat10       = 0x477C0000;
+    const unsigned int float32MinNormfloat10   = 0x38800000;
+    const unsigned int float32MinDenormfloat10 = 0x35800040;
+
+    const unsigned int float32Bits = bitCast<unsigned int>(fp32);
+    const bool float32Sign         = (float32Bits & float32SignMask) == float32SignMask;
+
+    unsigned int float32Val = float32Bits & float32ValueMask;
+
+    if ((float32Val & float32ExponentMask) == float32ExponentMask)
+    {
+        // INF or NAN
+        if ((float32Val & float32MantissaMask) != 0)
+        {
+            return float10ExponentMask |
+                   (((float32Val >> 18) | (float32Val >> 13) | (float32Val >> 3) | (float32Val)) &
+                    float10MantissaMask);
+        }
+        else if (float32Sign)
+        {
+            // -INF is clamped to 0 since float10 is positive only
+            return 0;
+        }
+        else
+        {
+            return float10ExponentMask;
+        }
+    }
+    else if (float32Sign)
+    {
+        // float10 is positive only, so clamp to zero
+        return 0;
+    }
+    else if (float32Val > float32Maxfloat10)
+    {
+        // The number is too large to be represented as a float10, set to max
+        return float10Max;
+    }
+    else if (float32Val < float32MinDenormfloat10)
+    {
+        // The number is too small to be represented as a denormalized float10, set to 0
+        return 0;
+    }
+    else
+    {
+        if (float32Val < float32MinNormfloat10)
+        {
+            // The number is too small to be represented as a normalized float10
+            // Convert it to a denormalized value.
+            const unsigned int shift = (float32ExponentBias - float10ExponentBias) -
+                                       (float32Val >> float32ExponentFirstBit);
+            ASSERT(shift < 32);
+            float32Val =
+                ((1 << float32ExponentFirstBit) | (float32Val & float32MantissaMask)) >> shift;
+        }
+        else
+        {
+            // Rebias the exponent to represent the value as a normalized float10
+            float32Val += 0xC8000000;
+        }
+
+        return ((float32Val + 0x1FFFF + ((float32Val >> 18) & 1)) >> 18) & float10BitMask;
+    }
+}
+
+inline float float11ToFloat32(unsigned short fp11)
+{
+    unsigned short exponent = (fp11 >> 6) & 0x1F;
+    unsigned short mantissa = fp11 & 0x3F;
+
+    if (exponent == 0x1F)
+    {
+        // INF or NAN
+        return bitCast<float>(0x7f800000 | (mantissa << 17));
+    }
+    else
+    {
+        if (exponent != 0)
+        {
+            // normalized
+        }
+        else if (mantissa != 0)
+        {
+            // The value is denormalized
+            exponent = 1;
+
+            do
+            {
+                exponent--;
+                mantissa <<= 1;
+            } while ((mantissa & 0x40) == 0);
+
+            mantissa = mantissa & 0x3F;
+        }
+        else  // The value is zero
+        {
+            exponent = static_cast<unsigned short>(-112);
+        }
+
+        return bitCast<float>(((exponent + 112) << 23) | (mantissa << 17));
+    }
+}
+
+inline float float10ToFloat32(unsigned short fp10)
+{
+    unsigned short exponent = (fp10 >> 5) & 0x1F;
+    unsigned short mantissa = fp10 & 0x1F;
+
+    if (exponent == 0x1F)
+    {
+        // INF or NAN
+        return bitCast<float>(0x7f800000 | (mantissa << 17));
+    }
+    else
+    {
+        if (exponent != 0)
+        {
+            // normalized
+        }
+        else if (mantissa != 0)
+        {
+            // The value is denormalized
+            exponent = 1;
+
+            do
+            {
+                exponent--;
+                mantissa <<= 1;
+            } while ((mantissa & 0x20) == 0);
+
+            mantissa = mantissa & 0x1F;
+        }
+        else  // The value is zero
+        {
+            exponent = static_cast<unsigned short>(-112);
+        }
+
+        return bitCast<float>(((exponent + 112) << 23) | (mantissa << 18));
+    }
+}
+
+// Converts to and from float and 16.16 fixed point format.
+inline float ConvertFixedToFloat(int32_t fixedInput)
+{
+    return static_cast<float>(fixedInput) / 65536.0f;
+}
+
+inline uint32_t ConvertFloatToFixed(float floatInput)
+{
+    static constexpr uint32_t kHighest = 32767 * 65536 + 65535;
+    static constexpr uint32_t kLowest  = static_cast<uint32_t>(-32768 * 65536 + 65535);
+
+    if (floatInput > 32767.65535)
+    {
+        return kHighest;
+    }
+    else if (floatInput < -32768.65535)
+    {
+        return kLowest;
+    }
+    else
+    {
+        return static_cast<uint32_t>(floatInput * 65536);
+    }
+}
+
+template <typename T>
+inline float normalizedToFloat(T input)
+{
+    static_assert(std::numeric_limits<T>::is_integer, "T must be an integer.");
+
+    if (sizeof(T) > 2)
+    {
+        // float has only a 23 bit mantissa, so we need to do the calculation in double precision
+        constexpr double inverseMax = 1.0 / std::numeric_limits<T>::max();
+        return static_cast<float>(input * inverseMax);
+    }
+    else
+    {
+        constexpr float inverseMax = 1.0f / std::numeric_limits<T>::max();
+        return input * inverseMax;
+    }
+}
+
+template <unsigned int inputBitCount, typename T>
+inline float normalizedToFloat(T input)
+{
+    static_assert(std::numeric_limits<T>::is_integer, "T must be an integer.");
+    static_assert(inputBitCount < (sizeof(T) * 8), "T must have more bits than inputBitCount.");
+    ASSERT((input & ~((1 << inputBitCount) - 1)) == 0);
+
+    if (inputBitCount > 23)
+    {
+        // float has only a 23 bit mantissa, so we need to do the calculation in double precision
+        constexpr double inverseMax = 1.0 / ((1 << inputBitCount) - 1);
+        return static_cast<float>(input * inverseMax);
+    }
+    else
+    {
+        constexpr float inverseMax = 1.0f / ((1 << inputBitCount) - 1);
+        return input * inverseMax;
+    }
+}
+
+template <typename T>
+inline T floatToNormalized(float input)
+{
+    if constexpr (sizeof(T) > 2)
+    {
+        // float has only a 23 bit mantissa, so we need to do the calculation in double precision
+        return static_cast<T>(std::numeric_limits<T>::max() * static_cast<double>(input) + 0.5);
+    }
+    else
+    {
+        return static_cast<T>(std::numeric_limits<T>::max() * input + 0.5f);
+    }
+}
+
+template <unsigned int outputBitCount, typename T>
+inline T floatToNormalized(float input)
+{
+    static_assert(outputBitCount < (sizeof(T) * 8), "T must have more bits than outputBitCount.");
+
+    if (outputBitCount > 23)
+    {
+        // float has only a 23 bit mantissa, so we need to do the calculation in double precision
+        return static_cast<T>(((1 << outputBitCount) - 1) * static_cast<double>(input) + 0.5);
+    }
+    else
+    {
+        return static_cast<T>(((1 << outputBitCount) - 1) * input + 0.5f);
+    }
+}
+
+template <unsigned int inputBitCount, unsigned int inputBitStart, typename T>
+inline T getShiftedData(T input)
+{
+    static_assert(inputBitCount + inputBitStart <= (sizeof(T) * 8),
+                  "T must have at least as many bits as inputBitCount + inputBitStart.");
+    const T mask = (1 << inputBitCount) - 1;
+    return (input >> inputBitStart) & mask;
+}
+
+template <unsigned int inputBitCount, unsigned int inputBitStart, typename T>
+inline T shiftData(T input)
+{
+    static_assert(inputBitCount + inputBitStart <= (sizeof(T) * 8),
+                  "T must have at least as many bits as inputBitCount + inputBitStart.");
+    const T mask = (1 << inputBitCount) - 1;
+    return (input & mask) << inputBitStart;
+}
+
+inline unsigned int CountLeadingZeros(uint32_t x)
+{
+    // Use binary search to find the amount of leading zeros.
+    unsigned int zeros = 32u;
+    uint32_t y;
+
+    y = x >> 16u;
+    if (y != 0)
+    {
+        zeros = zeros - 16u;
+        x     = y;
+    }
+    y = x >> 8u;
+    if (y != 0)
+    {
+        zeros = zeros - 8u;
+        x     = y;
+    }
+    y = x >> 4u;
+    if (y != 0)
+    {
+        zeros = zeros - 4u;
+        x     = y;
+    }
+    y = x >> 2u;
+    if (y != 0)
+    {
+        zeros = zeros - 2u;
+        x     = y;
+    }
+    y = x >> 1u;
+    if (y != 0)
+    {
+        return zeros - 2u;
+    }
+    return zeros - x;
+}
+
+inline unsigned char average(unsigned char a, unsigned char b)
+{
+    return ((a ^ b) >> 1) + (a & b);
+}
+
+inline signed char average(signed char a, signed char b)
+{
+    return ((short)a + (short)b) / 2;
+}
+
+inline unsigned short average(unsigned short a, unsigned short b)
+{
+    return ((a ^ b) >> 1) + (a & b);
+}
+
+inline signed short average(signed short a, signed short b)
+{
+    return ((int)a + (int)b) / 2;
+}
+
+inline unsigned int average(unsigned int a, unsigned int b)
+{
+    return ((a ^ b) >> 1) + (a & b);
+}
+
+inline int average(int a, int b)
+{
+    long long average = (static_cast<long long>(a) + static_cast<long long>(b)) / 2LL;
+    return static_cast<int>(average);
+}
+
+inline float average(float a, float b)
+{
+    return (a + b) * 0.5f;
+}
+
+inline unsigned short averageHalfFloat(unsigned short a, unsigned short b)
+{
+    return float32ToFloat16((float16ToFloat32(a) + float16ToFloat32(b)) * 0.5f);
+}
+
+inline unsigned int averageFloat11(unsigned int a, unsigned int b)
+{
+    return float32ToFloat11((float11ToFloat32(static_cast<unsigned short>(a)) +
+                             float11ToFloat32(static_cast<unsigned short>(b))) *
+                            0.5f);
+}
+
+inline unsigned int averageFloat10(unsigned int a, unsigned int b)
+{
+    return float32ToFloat10((float10ToFloat32(static_cast<unsigned short>(a)) +
+                             float10ToFloat32(static_cast<unsigned short>(b))) *
+                            0.5f);
+}
+
+template <typename T>
+class Range
+{
+  public:
+    Range() {}
+    Range(T lo, T hi) : mLow(lo), mHigh(hi) {}
+
+    T length() const { return (empty() ? 0 : (mHigh - mLow)); }
+
+    bool intersects(Range<T> other)
+    {
+        if (mLow <= other.mLow)
+        {
+            return other.mLow < mHigh;
+        }
+        else
+        {
+            return mLow < other.mHigh;
+        }
+    }
+
+    // Assumes that end is non-inclusive.. for example, extending to 5 will make "end" 6.
+    void extend(T value)
+    {
+        mLow  = value < mLow ? value : mLow;
+        mHigh = value >= mHigh ? (value + 1) : mHigh;
+    }
+
+    bool empty() const { return mHigh <= mLow; }
+
+    bool contains(T value) const { return value >= mLow && value < mHigh; }
+
+    class Iterator final
+    {
+      public:
+        Iterator(T value) : mCurrent(value) {}
+
+        Iterator &operator++()
+        {
+            mCurrent++;
+            return *this;
+        }
+        bool operator==(const Iterator &other) const { return mCurrent == other.mCurrent; }
+        bool operator!=(const Iterator &other) const { return mCurrent != other.mCurrent; }
+        T operator*() const { return mCurrent; }
+
+      private:
+        T mCurrent;
+    };
+
+    Iterator begin() const { return Iterator(mLow); }
+
+    Iterator end() const { return Iterator(mHigh); }
+
+    T low() const { return mLow; }
+    T high() const { return mHigh; }
+
+    void invalidate()
+    {
+        mLow  = std::numeric_limits<T>::max();
+        mHigh = std::numeric_limits<T>::min();
+    }
+
+  private:
+    T mLow;
+    T mHigh;
+};
+
+typedef Range<int> RangeI;
+typedef Range<unsigned int> RangeUI;
+
+struct IndexRange
+{
+    struct Undefined
+    {};
+    IndexRange(Undefined) {}
+    IndexRange() : IndexRange(0, 0, 0) {}
+    IndexRange(size_t start_, size_t end_, size_t vertexIndexCount_)
+        : start(start_), end(end_), vertexIndexCount(vertexIndexCount_)
+    {
+        ASSERT(start <= end);
+    }
+
+    // Number of vertices in the range.
+    size_t vertexCount() const { return (end - start) + 1; }
+
+    // Inclusive range of indices that are not primitive restart
+    size_t start;
+    size_t end;
+
+    // Number of non-primitive restart indices
+    size_t vertexIndexCount;
+};
+
+// Combine a floating-point value representing a mantissa (x) and an integer exponent (exp) into a
+// floating-point value. As in GLSL ldexp() built-in.
+inline float Ldexp(float x, int exp)
+{
+    if (exp > 128)
+    {
+        return std::numeric_limits<float>::infinity();
+    }
+    if (exp < -126)
+    {
+        return 0.0f;
+    }
+    double result = static_cast<double>(x) * std::pow(2.0, static_cast<double>(exp));
+    return static_cast<float>(result);
+}
+
+// First, both normalized floating-point values are converted into 16-bit integer values.
+// Then, the results are packed into the returned 32-bit unsigned integer.
+// The first float value will be written to the least significant bits of the output;
+// the last float value will be written to the most significant bits.
+// The conversion of each value to fixed point is done as follows :
+// packSnorm2x16 : round(clamp(c, -1, +1) * 32767.0)
+inline uint32_t packSnorm2x16(float f1, float f2)
+{
+    int16_t leastSignificantBits = static_cast<int16_t>(roundf(clamp(f1, -1.0f, 1.0f) * 32767.0f));
+    int16_t mostSignificantBits  = static_cast<int16_t>(roundf(clamp(f2, -1.0f, 1.0f) * 32767.0f));
+    return static_cast<uint32_t>(mostSignificantBits) << 16 |
+           (static_cast<uint32_t>(leastSignificantBits) & 0xFFFF);
+}
+
+// First, unpacks a single 32-bit unsigned integer u into a pair of 16-bit unsigned integers. Then,
+// each component is converted to a normalized floating-point value to generate the returned two
+// float values. The first float value will be extracted from the least significant bits of the
+// input; the last float value will be extracted from the most-significant bits. The conversion for
+// unpacked fixed-point value to floating point is done as follows: unpackSnorm2x16 : clamp(f /
+// 32767.0, -1, +1)
+inline void unpackSnorm2x16(uint32_t u, float *f1, float *f2)
+{
+    int16_t leastSignificantBits = static_cast<int16_t>(u & 0xFFFF);
+    int16_t mostSignificantBits  = static_cast<int16_t>(u >> 16);
+    *f1 = clamp(static_cast<float>(leastSignificantBits) / 32767.0f, -1.0f, 1.0f);
+    *f2 = clamp(static_cast<float>(mostSignificantBits) / 32767.0f, -1.0f, 1.0f);
+}
+
+// First, both normalized floating-point values are converted into 16-bit integer values.
+// Then, the results are packed into the returned 32-bit unsigned integer.
+// The first float value will be written to the least significant bits of the output;
+// the last float value will be written to the most significant bits.
+// The conversion of each value to fixed point is done as follows:
+// packUnorm2x16 : round(clamp(c, 0, +1) * 65535.0)
+inline uint32_t packUnorm2x16(float f1, float f2)
+{
+    uint16_t leastSignificantBits = static_cast<uint16_t>(roundf(clamp(f1, 0.0f, 1.0f) * 65535.0f));
+    uint16_t mostSignificantBits  = static_cast<uint16_t>(roundf(clamp(f2, 0.0f, 1.0f) * 65535.0f));
+    return static_cast<uint32_t>(mostSignificantBits) << 16 |
+           static_cast<uint32_t>(leastSignificantBits);
+}
+
+// First, unpacks a single 32-bit unsigned integer u into a pair of 16-bit unsigned integers. Then,
+// each component is converted to a normalized floating-point value to generate the returned two
+// float values. The first float value will be extracted from the least significant bits of the
+// input; the last float value will be extracted from the most-significant bits. The conversion for
+// unpacked fixed-point value to floating point is done as follows: unpackUnorm2x16 : f / 65535.0
+inline void unpackUnorm2x16(uint32_t u, float *f1, float *f2)
+{
+    uint16_t leastSignificantBits = static_cast<uint16_t>(u & 0xFFFF);
+    uint16_t mostSignificantBits  = static_cast<uint16_t>(u >> 16);
+    *f1                           = static_cast<float>(leastSignificantBits) / 65535.0f;
+    *f2                           = static_cast<float>(mostSignificantBits) / 65535.0f;
+}
+
+// Helper functions intended to be used only here.
+namespace priv
+{
+
+inline uint8_t ToPackedUnorm8(float f)
+{
+    return static_cast<uint8_t>(roundf(clamp(f, 0.0f, 1.0f) * 255.0f));
+}
+
+inline int8_t ToPackedSnorm8(float f)
+{
+    return static_cast<int8_t>(roundf(clamp(f, -1.0f, 1.0f) * 127.0f));
+}
+
+}  // namespace priv
+
+// Packs 4 normalized unsigned floating-point values to a single 32-bit unsigned integer. Works
+// similarly to packUnorm2x16. The floats are clamped to the range 0.0 to 1.0, and written to the
+// unsigned integer starting from the least significant bits.
+inline uint32_t PackUnorm4x8(float f1, float f2, float f3, float f4)
+{
+    uint8_t bits[4];
+    bits[0]         = priv::ToPackedUnorm8(f1);
+    bits[1]         = priv::ToPackedUnorm8(f2);
+    bits[2]         = priv::ToPackedUnorm8(f3);
+    bits[3]         = priv::ToPackedUnorm8(f4);
+    uint32_t result = 0u;
+    for (int i = 0; i < 4; ++i)
+    {
+        int shift = i * 8;
+        result |= (static_cast<uint32_t>(bits[i]) << shift);
+    }
+    return result;
+}
+
+// Unpacks 4 normalized unsigned floating-point values from a single 32-bit unsigned integer into f.
+// Works similarly to unpackUnorm2x16. The floats are unpacked starting from the least significant
+// bits.
+inline void UnpackUnorm4x8(uint32_t u, float *f)
+{
+    for (int i = 0; i < 4; ++i)
+    {
+        int shift    = i * 8;
+        uint8_t bits = static_cast<uint8_t>((u >> shift) & 0xFF);
+        f[i]         = static_cast<float>(bits) / 255.0f;
+    }
+}
+
+// Packs 4 normalized signed floating-point values to a single 32-bit unsigned integer. The floats
+// are clamped to the range -1.0 to 1.0, and written to the unsigned integer starting from the least
+// significant bits.
+inline uint32_t PackSnorm4x8(float f1, float f2, float f3, float f4)
+{
+    int8_t bits[4];
+    bits[0]         = priv::ToPackedSnorm8(f1);
+    bits[1]         = priv::ToPackedSnorm8(f2);
+    bits[2]         = priv::ToPackedSnorm8(f3);
+    bits[3]         = priv::ToPackedSnorm8(f4);
+    uint32_t result = 0u;
+    for (int i = 0; i < 4; ++i)
+    {
+        int shift = i * 8;
+        result |= ((static_cast<uint32_t>(bits[i]) & 0xFF) << shift);
+    }
+    return result;
+}
+
+// Unpacks 4 normalized signed floating-point values from a single 32-bit unsigned integer into f.
+// Works similarly to unpackSnorm2x16. The floats are unpacked starting from the least significant
+// bits, and clamped to the range -1.0 to 1.0.
+inline void UnpackSnorm4x8(uint32_t u, float *f)
+{
+    for (int i = 0; i < 4; ++i)
+    {
+        int shift   = i * 8;
+        int8_t bits = static_cast<int8_t>((u >> shift) & 0xFF);
+        f[i]        = clamp(static_cast<float>(bits) / 127.0f, -1.0f, 1.0f);
+    }
+}
+
+// Returns an unsigned integer obtained by converting the two floating-point values to the 16-bit
+// floating-point representation found in the OpenGL ES Specification, and then packing these
+// two 16-bit integers into a 32-bit unsigned integer.
+// f1: The 16 least-significant bits of the result;
+// f2: The 16 most-significant bits.
+inline uint32_t packHalf2x16(float f1, float f2)
+{
+    uint16_t leastSignificantBits = static_cast<uint16_t>(float32ToFloat16(f1));
+    uint16_t mostSignificantBits  = static_cast<uint16_t>(float32ToFloat16(f2));
+    return static_cast<uint32_t>(mostSignificantBits) << 16 |
+           static_cast<uint32_t>(leastSignificantBits);
+}
+
+// Returns two floating-point values obtained by unpacking a 32-bit unsigned integer into a pair of
+// 16-bit values, interpreting those values as 16-bit floating-point numbers according to the OpenGL
+// ES Specification, and converting them to 32-bit floating-point values. The first float value is
+// obtained from the 16 least-significant bits of u; the second component is obtained from the 16
+// most-significant bits of u.
+inline void unpackHalf2x16(uint32_t u, float *f1, float *f2)
+{
+    uint16_t leastSignificantBits = static_cast<uint16_t>(u & 0xFFFF);
+    uint16_t mostSignificantBits  = static_cast<uint16_t>(u >> 16);
+
+    *f1 = float16ToFloat32(leastSignificantBits);
+    *f2 = float16ToFloat32(mostSignificantBits);
+}
+
+inline uint8_t sRGBToLinear(uint8_t srgbValue)
+{
+    float value = srgbValue / 255.0f;
+    if (value <= 0.04045f)
+    {
+        value = value / 12.92f;
+    }
+    else
+    {
+        value = std::pow((value + 0.055f) / 1.055f, 2.4f);
+    }
+    return static_cast<uint8_t>(clamp(value * 255.0f + 0.5f, 0.0f, 255.0f));
+}
+
+inline uint8_t linearToSRGB(uint8_t linearValue)
+{
+    float value = linearValue / 255.0f;
+    if (value <= 0.0f)
+    {
+        value = 0.0f;
+    }
+    else if (value < 0.0031308f)
+    {
+        value = value * 12.92f;
+    }
+    else if (value < 1.0f)
+    {
+        value = std::pow(value, 0.41666f) * 1.055f - 0.055f;
+    }
+    else
+    {
+        value = 1.0f;
+    }
+    return static_cast<uint8_t>(clamp(value * 255.0f + 0.5f, 0.0f, 255.0f));
+}
+
+// Reverse the order of the bits.
+inline uint32_t BitfieldReverse(uint32_t value)
+{
+    // TODO(oetuaho@nvidia.com): Optimize this if needed. There don't seem to be compiler intrinsics
+    // for this, and right now it's not used in performance-critical paths.
+    uint32_t result = 0u;
+    for (size_t j = 0u; j < 32u; ++j)
+    {
+        result |= (((value >> j) & 1u) << (31u - j));
+    }
+    return result;
+}
+
+// Count the 1 bits.
+#if defined(_MSC_VER) && !defined(__clang__)
+#    if defined(_M_IX86) || defined(_M_X64)
+namespace priv
+{
+// Check POPCNT instruction support and cache the result.
+// https://docs.microsoft.com/en-us/cpp/intrinsics/popcnt16-popcnt-popcnt64#remarks
+static const bool kHasPopcnt = [] {
+    int info[4];
+    __cpuid(&info[0], 1);
+    return static_cast<bool>(info[2] & 0x800000);
+}();
+}  // namespace priv
+
+// Polyfills for x86/x64 CPUs without POPCNT.
+// https://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
+inline int BitCountPolyfill(uint32_t bits)
+{
+    bits = bits - ((bits >> 1) & 0x55555555);
+    bits = (bits & 0x33333333) + ((bits >> 2) & 0x33333333);
+    bits = ((bits + (bits >> 4) & 0x0F0F0F0F) * 0x01010101) >> 24;
+    return static_cast<int>(bits);
+}
+
+inline int BitCountPolyfill(uint64_t bits)
+{
+    bits = bits - ((bits >> 1) & 0x5555555555555555ull);
+    bits = (bits & 0x3333333333333333ull) + ((bits >> 2) & 0x3333333333333333ull);
+    bits = ((bits + (bits >> 4) & 0x0F0F0F0F0F0F0F0Full) * 0x0101010101010101ull) >> 56;
+    return static_cast<int>(bits);
+}
+
+inline int BitCount(uint32_t bits)
+{
+    if (priv::kHasPopcnt)
+    {
+        return static_cast<int>(__popcnt(bits));
+    }
+    return BitCountPolyfill(bits);
+}
+
+inline int BitCount(uint64_t bits)
+{
+    if (priv::kHasPopcnt)
+    {
+#        if defined(_M_X64)
+        return static_cast<int>(__popcnt64(bits));
+#        else   // x86
+        return static_cast<int>(__popcnt(static_cast<uint32_t>(bits >> 32)) +
+                                __popcnt(static_cast<uint32_t>(bits)));
+#        endif  // defined(_M_X64)
+    }
+    return BitCountPolyfill(bits);
+}
+
+#    elif defined(_M_ARM) || defined(_M_ARM64)
+
+// MSVC's _CountOneBits* intrinsics are not defined for ARM64, moreover they do not use dedicated
+// NEON instructions.
+
+inline int BitCount(uint32_t bits)
+{
+    // cast bits to 8x8 datatype and use VCNT on it
+    const uint8x8_t vsum = vcnt_u8(vcreate_u8(static_cast<uint64_t>(bits)));
+
+    // pairwise sums: 8x8 -> 16x4 -> 32x2
+    return static_cast<int>(vget_lane_u32(vpaddl_u16(vpaddl_u8(vsum)), 0));
+}
+
+inline int BitCount(uint64_t bits)
+{
+    // cast bits to 8x8 datatype and use VCNT on it
+    const uint8x8_t vsum = vcnt_u8(vcreate_u8(bits));
+
+    // pairwise sums: 8x8 -> 16x4 -> 32x2 -> 64x1
+    return static_cast<int>(vget_lane_u64(vpaddl_u32(vpaddl_u16(vpaddl_u8(vsum))), 0));
+}
+#    endif  // defined(_M_IX86) || defined(_M_X64)
+#endif      // defined(_MSC_VER) && !defined(__clang__)
+
+#if defined(ANGLE_PLATFORM_POSIX) || defined(__clang__)
+inline int BitCount(uint32_t bits)
+{
+    return __builtin_popcount(bits);
+}
+
+inline int BitCount(uint64_t bits)
+{
+    return __builtin_popcountll(bits);
+}
+#endif  // defined(ANGLE_PLATFORM_POSIX) || defined(__clang__)
+
+inline int BitCount(uint8_t bits)
+{
+    return BitCount(static_cast<uint32_t>(bits));
+}
+
+inline int BitCount(uint16_t bits)
+{
+    return BitCount(static_cast<uint32_t>(bits));
+}
+
+#if defined(ANGLE_PLATFORM_WINDOWS)
+// Return the index of the least significant bit set. Indexing is such that bit 0 is the least
+// significant bit. Implemented for different bit widths on different platforms.
+inline unsigned long ScanForward(uint32_t bits)
+{
+    ASSERT(bits != 0u);
+    unsigned long firstBitIndex = 0ul;
+    unsigned char ret           = _BitScanForward(&firstBitIndex, bits);
+    ASSERT(ret != 0u);
+    return firstBitIndex;
+}
+
+inline unsigned long ScanForward(uint64_t bits)
+{
+    ASSERT(bits != 0u);
+    unsigned long firstBitIndex = 0ul;
+#    if defined(ANGLE_IS_64_BIT_CPU)
+    unsigned char ret = _BitScanForward64(&firstBitIndex, bits);
+#    else
+    unsigned char ret;
+    if (static_cast<uint32_t>(bits) == 0)
+    {
+        ret = _BitScanForward(&firstBitIndex, static_cast<uint32_t>(bits >> 32));
+        firstBitIndex += 32ul;
+    }
+    else
+    {
+        ret = _BitScanForward(&firstBitIndex, static_cast<uint32_t>(bits));
+    }
+#    endif  // defined(ANGLE_IS_64_BIT_CPU)
+    ASSERT(ret != 0u);
+    return firstBitIndex;
+}
+
+// Return the index of the most significant bit set. Indexing is such that bit 0 is the least
+// significant bit.
+inline unsigned long ScanReverse(uint32_t bits)
+{
+    ASSERT(bits != 0u);
+    unsigned long lastBitIndex = 0ul;
+    unsigned char ret          = _BitScanReverse(&lastBitIndex, bits);
+    ASSERT(ret != 0u);
+    return lastBitIndex;
+}
+
+inline unsigned long ScanReverse(uint64_t bits)
+{
+    ASSERT(bits != 0u);
+    unsigned long lastBitIndex = 0ul;
+#    if defined(ANGLE_IS_64_BIT_CPU)
+    unsigned char ret = _BitScanReverse64(&lastBitIndex, bits);
+#    else
+    unsigned char ret;
+    if (static_cast<uint32_t>(bits >> 32) == 0)
+    {
+        ret = _BitScanReverse(&lastBitIndex, static_cast<uint32_t>(bits));
+    }
+    else
+    {
+        ret = _BitScanReverse(&lastBitIndex, static_cast<uint32_t>(bits >> 32));
+        lastBitIndex += 32ul;
+    }
+#    endif  // defined(ANGLE_IS_64_BIT_CPU)
+    ASSERT(ret != 0u);
+    return lastBitIndex;
+}
+#endif  // defined(ANGLE_PLATFORM_WINDOWS)
+
+#if defined(ANGLE_PLATFORM_POSIX)
+inline unsigned long ScanForward(uint32_t bits)
+{
+    ASSERT(bits != 0u);
+    return static_cast<unsigned long>(__builtin_ctz(bits));
+}
+
+inline unsigned long ScanForward(uint64_t bits)
+{
+    ASSERT(bits != 0u);
+#    if defined(ANGLE_IS_64_BIT_CPU)
+    return static_cast<unsigned long>(__builtin_ctzll(bits));
+#    else
+    return static_cast<unsigned long>(static_cast<uint32_t>(bits) == 0
+                                          ? __builtin_ctz(static_cast<uint32_t>(bits >> 32)) + 32
+                                          : __builtin_ctz(static_cast<uint32_t>(bits)));
+#    endif  // defined(ANGLE_IS_64_BIT_CPU)
+}
+
+inline unsigned long ScanReverse(uint32_t bits)
+{
+    ASSERT(bits != 0u);
+    return static_cast<unsigned long>(sizeof(uint32_t) * CHAR_BIT - 1 - __builtin_clz(bits));
+}
+
+inline unsigned long ScanReverse(uint64_t bits)
+{
+    ASSERT(bits != 0u);
+#    if defined(ANGLE_IS_64_BIT_CPU)
+    return static_cast<unsigned long>(sizeof(uint64_t) * CHAR_BIT - 1 - __builtin_clzll(bits));
+#    else
+    if (static_cast<uint32_t>(bits >> 32) == 0)
+    {
+        return sizeof(uint32_t) * CHAR_BIT - 1 - __builtin_clz(static_cast<uint32_t>(bits));
+    }
+    else
+    {
+        return sizeof(uint32_t) * CHAR_BIT - 1 - __builtin_clz(static_cast<uint32_t>(bits >> 32)) +
+               32;
+    }
+#    endif  // defined(ANGLE_IS_64_BIT_CPU)
+}
+#endif  // defined(ANGLE_PLATFORM_POSIX)
+
+inline unsigned long ScanForward(uint8_t bits)
+{
+    return ScanForward(static_cast<uint32_t>(bits));
+}
+
+inline unsigned long ScanForward(uint16_t bits)
+{
+    return ScanForward(static_cast<uint32_t>(bits));
+}
+
+inline unsigned long ScanReverse(uint8_t bits)
+{
+    return ScanReverse(static_cast<uint32_t>(bits));
+}
+
+inline unsigned long ScanReverse(uint16_t bits)
+{
+    return ScanReverse(static_cast<uint32_t>(bits));
+}
+
+// Returns -1 on 0, otherwise the index of the least significant 1 bit as in GLSL.
+template <typename T>
+int FindLSB(T bits)
+{
+    static_assert(std::is_integral<T>::value, "must be integral type.");
+    if (bits == 0u)
+    {
+        return -1;
+    }
+    else
+    {
+        return static_cast<int>(ScanForward(bits));
+    }
+}
+
+// Returns -1 on 0, otherwise the index of the most significant 1 bit as in GLSL.
+template <typename T>
+int FindMSB(T bits)
+{
+    static_assert(std::is_integral<T>::value, "must be integral type.");
+    if (bits == 0u)
+    {
+        return -1;
+    }
+    else
+    {
+        return static_cast<int>(ScanReverse(bits));
+    }
+}
+
+// Returns whether the argument is Not a Number.
+// IEEE 754 single precision NaN representation: Exponent(8 bits) - 255, Mantissa(23 bits) -
+// non-zero.
+inline bool isNaN(float f)
+{
+    // Exponent mask: ((1u << 8) - 1u) << 23 = 0x7f800000u
+    // Mantissa mask: ((1u << 23) - 1u) = 0x7fffffu
+    return ((bitCast<uint32_t>(f) & 0x7f800000u) == 0x7f800000u) &&
+           (bitCast<uint32_t>(f) & 0x7fffffu);
+}
+
+// Returns whether the argument is infinity.
+// IEEE 754 single precision infinity representation: Exponent(8 bits) - 255, Mantissa(23 bits) -
+// zero.
+inline bool isInf(float f)
+{
+    // Exponent mask: ((1u << 8) - 1u) << 23 = 0x7f800000u
+    // Mantissa mask: ((1u << 23) - 1u) = 0x7fffffu
+    return ((bitCast<uint32_t>(f) & 0x7f800000u) == 0x7f800000u) &&
+           !(bitCast<uint32_t>(f) & 0x7fffffu);
+}
+
+namespace priv
+{
+template <unsigned int N, unsigned int R>
+struct iSquareRoot
+{
+    static constexpr unsigned int solve()
+    {
+        return (R * R > N)
+                   ? 0
+                   : ((R * R == N) ? R : static_cast<unsigned int>(iSquareRoot<N, R + 1>::value));
+    }
+    enum Result
+    {
+        value = iSquareRoot::solve()
+    };
+};
+
+template <unsigned int N>
+struct iSquareRoot<N, N>
+{
+    enum result
+    {
+        value = N
+    };
+};
+
+}  // namespace priv
+
+template <unsigned int N>
+constexpr unsigned int iSquareRoot()
+{
+    return priv::iSquareRoot<N, 1>::value;
+}
+
+// Sum, difference and multiplication operations for signed ints that wrap on 32-bit overflow.
+//
+// Unsigned types are defined to do arithmetic modulo 2^n in C++. For signed types, overflow
+// behavior is undefined.
+
+template <typename T>
+inline T WrappingSum(T lhs, T rhs)
+{
+    uint32_t lhsUnsigned = static_cast<uint32_t>(lhs);
+    uint32_t rhsUnsigned = static_cast<uint32_t>(rhs);
+    return static_cast<T>(lhsUnsigned + rhsUnsigned);
+}
+
+template <typename T>
+inline T WrappingDiff(T lhs, T rhs)
+{
+    uint32_t lhsUnsigned = static_cast<uint32_t>(lhs);
+    uint32_t rhsUnsigned = static_cast<uint32_t>(rhs);
+    return static_cast<T>(lhsUnsigned - rhsUnsigned);
+}
+
+inline int32_t WrappingMul(int32_t lhs, int32_t rhs)
+{
+    int64_t lhsWide = static_cast<int64_t>(lhs);
+    int64_t rhsWide = static_cast<int64_t>(rhs);
+    // The multiplication is guaranteed not to overflow.
+    int64_t resultWide = lhsWide * rhsWide;
+    // Implement the desired wrapping behavior by masking out the high-order 32 bits.
+    resultWide = resultWide & 0xffffffffLL;
+    // Casting to a narrower signed type is fine since the casted value is representable in the
+    // narrower type.
+    return static_cast<int32_t>(resultWide);
+}
+
+inline float scaleScreenDimensionToNdc(float dimensionScreen, float viewportDimension)
+{
+    return 2.0f * dimensionScreen / viewportDimension;
+}
+
+inline float scaleScreenCoordinateToNdc(float coordinateScreen, float viewportDimension)
+{
+    float halfShifted = coordinateScreen / viewportDimension;
+    return 2.0f * (halfShifted - 0.5f);
+}
+
+}  // namespace gl
+
+namespace rx
+{
+
+template <typename T>
+T roundUp(const T value, const T alignment)
+{
+    auto temp = value + alignment - static_cast<T>(1);
+    return temp - temp % alignment;
+}
+
+template <typename T>
+constexpr T roundUpPow2(const T value, const T alignment)
+{
+    ASSERT(gl::isPow2(alignment));
+    return (value + alignment - 1) & ~(alignment - 1);
+}
+
+template <typename T>
+constexpr T roundDownPow2(const T value, const T alignment)
+{
+    ASSERT(gl::isPow2(alignment));
+    return value & ~(alignment - 1);
+}
+
+template <typename T>
+angle::CheckedNumeric<T> CheckedRoundUp(const T value, const T alignment)
+{
+    angle::CheckedNumeric<T> checkedValue(value);
+    angle::CheckedNumeric<T> checkedAlignment(alignment);
+    return roundUp(checkedValue, checkedAlignment);
+}
+
+inline constexpr unsigned int UnsignedCeilDivide(unsigned int value, unsigned int divisor)
+{
+    unsigned int divided = value / divisor;
+    return (divided + ((value % divisor == 0) ? 0 : 1));
+}
+
+#if defined(__has_builtin)
+#    define ANGLE_HAS_BUILTIN(x) __has_builtin(x)
+#else
+#    define ANGLE_HAS_BUILTIN(x) 0
+#endif
+
+#if defined(_MSC_VER)
+
+#    define ANGLE_ROTL(x, y) _rotl(x, y)
+#    define ANGLE_ROTL64(x, y) _rotl64(x, y)
+#    define ANGLE_ROTR16(x, y) _rotr16(x, y)
+
+#elif defined(__clang__) && ANGLE_HAS_BUILTIN(__builtin_rotateleft32) && \
+    ANGLE_HAS_BUILTIN(__builtin_rotateleft64) && ANGLE_HAS_BUILTIN(__builtin_rotateright16)
+
+#    define ANGLE_ROTL(x, y) __builtin_rotateleft32(x, y)
+#    define ANGLE_ROTL64(x, y) __builtin_rotateleft64(x, y)
+#    define ANGLE_ROTR16(x, y) __builtin_rotateright16(x, y)
+
+#else
+
+inline uint32_t RotL(uint32_t x, int8_t r)
+{
+    return (x << r) | (x >> (32 - r));
+}
+
+inline uint64_t RotL64(uint64_t x, int8_t r)
+{
+    return (x << r) | (x >> (64 - r));
+}
+
+inline uint16_t RotR16(uint16_t x, int8_t r)
+{
+    return (x >> r) | (x << (16 - r));
+}
+
+#    define ANGLE_ROTL(x, y) ::rx::RotL(x, y)
+#    define ANGLE_ROTL64(x, y) ::rx::RotL64(x, y)
+#    define ANGLE_ROTR16(x, y) ::rx::RotR16(x, y)
+
+#endif  // namespace rx
+
+constexpr unsigned int Log2(unsigned int bytes)
+{
+    return bytes == 1 ? 0 : (1 + Log2(bytes / 2));
+}
+}  // namespace rx
+
+#endif  // COMMON_MATHUTIL_H_