379 lines
14 KiB
C++
379 lines
14 KiB
C++
/// @ref core
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/// @file glm/detail/func_integer.inl
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#include "../ext/vec1.hpp"
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#include "type_vec2.hpp"
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#include "type_vec3.hpp"
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#include "type_vec4.hpp"
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#include "type_int.hpp"
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#include "_vectorize.hpp"
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#if(GLM_ARCH & GLM_ARCH_X86 && GLM_COMPILER & GLM_COMPILER_VC)
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# include <intrin.h>
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# pragma intrinsic(_BitScanReverse)
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#endif//(GLM_ARCH & GLM_ARCH_X86 && GLM_COMPILER & GLM_COMPILER_VC)
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#include <limits>
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#if !GLM_HAS_EXTENDED_INTEGER_TYPE
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# if GLM_COMPILER & GLM_COMPILER_GCC
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# pragma GCC diagnostic ignored "-Wlong-long"
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# endif
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# if (GLM_COMPILER & GLM_COMPILER_CLANG)
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# pragma clang diagnostic ignored "-Wc++11-long-long"
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# endif
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#endif
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namespace glm{
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namespace detail
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{
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template<typename T>
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GLM_FUNC_QUALIFIER T mask(T Bits)
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{
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return Bits >= static_cast<T>(sizeof(T) * 8) ? ~static_cast<T>(0) : (static_cast<T>(1) << Bits) - static_cast<T>(1);
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}
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template<length_t L, typename T, qualifier Q, bool Aligned, bool EXEC>
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struct compute_bitfieldReverseStep
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T, T)
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{
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return v;
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}
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};
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template<length_t L, typename T, qualifier Q, bool Aligned>
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struct compute_bitfieldReverseStep<L, T, Q, Aligned, true>
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T Mask, T Shift)
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{
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return (v & Mask) << Shift | (v & (~Mask)) >> Shift;
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}
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};
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template<length_t L, typename T, qualifier Q, bool Aligned, bool EXEC>
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struct compute_bitfieldBitCountStep
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T, T)
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{
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return v;
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}
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};
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template<length_t L, typename T, qualifier Q, bool Aligned>
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struct compute_bitfieldBitCountStep<L, T, Q, Aligned, true>
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T Mask, T Shift)
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{
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return (v & Mask) + ((v >> Shift) & Mask);
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}
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};
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template<typename genIUType, size_t Bits>
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struct compute_findLSB
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{
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GLM_FUNC_QUALIFIER static int call(genIUType Value)
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{
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if(Value == 0)
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return -1;
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return glm::bitCount(~Value & (Value - static_cast<genIUType>(1)));
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}
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};
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# if GLM_HAS_BITSCAN_WINDOWS
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template<typename genIUType>
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struct compute_findLSB<genIUType, 32>
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{
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GLM_FUNC_QUALIFIER static int call(genIUType Value)
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{
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unsigned long Result(0);
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unsigned char IsNotNull = _BitScanForward(&Result, *reinterpret_cast<unsigned long*>(&Value));
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return IsNotNull ? int(Result) : -1;
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}
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};
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# if !((GLM_COMPILER & GLM_COMPILER_VC) && (GLM_MODEL == GLM_MODEL_32))
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template<typename genIUType>
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struct compute_findLSB<genIUType, 64>
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{
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GLM_FUNC_QUALIFIER static int call(genIUType Value)
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{
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unsigned long Result(0);
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unsigned char IsNotNull = _BitScanForward64(&Result, *reinterpret_cast<unsigned __int64*>(&Value));
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return IsNotNull ? int(Result) : -1;
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}
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};
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# endif
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# endif//GLM_HAS_BITSCAN_WINDOWS
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template<length_t L, typename T, qualifier Q, bool EXEC = true>
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struct compute_findMSB_step_vec
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x, T Shift)
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{
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return x | (x >> Shift);
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}
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};
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template<length_t L, typename T, qualifier Q>
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struct compute_findMSB_step_vec<L, T, Q, false>
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x, T)
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{
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return x;
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}
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};
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template<length_t L, typename T, qualifier Q, int>
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struct compute_findMSB_vec
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{
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GLM_FUNC_QUALIFIER static vec<L, int, Q> call(vec<L, T, Q> const& v)
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{
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vec<L, T, Q> x(v);
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x = compute_findMSB_step_vec<L, T, Q, sizeof(T) * 8 >= 8>::call(x, static_cast<T>( 1));
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x = compute_findMSB_step_vec<L, T, Q, sizeof(T) * 8 >= 8>::call(x, static_cast<T>( 2));
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x = compute_findMSB_step_vec<L, T, Q, sizeof(T) * 8 >= 8>::call(x, static_cast<T>( 4));
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x = compute_findMSB_step_vec<L, T, Q, sizeof(T) * 8 >= 16>::call(x, static_cast<T>( 8));
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x = compute_findMSB_step_vec<L, T, Q, sizeof(T) * 8 >= 32>::call(x, static_cast<T>(16));
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x = compute_findMSB_step_vec<L, T, Q, sizeof(T) * 8 >= 64>::call(x, static_cast<T>(32));
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return vec<L, int, Q>(sizeof(T) * 8 - 1) - glm::bitCount(~x);
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}
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};
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# if GLM_HAS_BITSCAN_WINDOWS
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template<typename genIUType>
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GLM_FUNC_QUALIFIER int compute_findMSB_32(genIUType Value)
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{
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unsigned long Result(0);
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unsigned char IsNotNull = _BitScanReverse(&Result, *reinterpret_cast<unsigned long*>(&Value));
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return IsNotNull ? int(Result) : -1;
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}
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template<length_t L, typename T, qualifier Q>
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struct compute_findMSB_vec<L, T, Q, 32>
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{
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GLM_FUNC_QUALIFIER static vec<L, int, Q> call(vec<L, T, Q> const& x)
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{
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return detail::functor1<L, int, T, Q>::call(compute_findMSB_32, x);
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}
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};
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# if !((GLM_COMPILER & GLM_COMPILER_VC) && (GLM_MODEL == GLM_MODEL_32))
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template<typename genIUType>
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GLM_FUNC_QUALIFIER int compute_findMSB_64(genIUType Value)
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{
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unsigned long Result(0);
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unsigned char IsNotNull = _BitScanReverse64(&Result, *reinterpret_cast<unsigned __int64*>(&Value));
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return IsNotNull ? int(Result) : -1;
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}
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template<length_t L, typename T, qualifier Q>
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struct compute_findMSB_vec<L, T, Q, 64>
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{
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GLM_FUNC_QUALIFIER static vec<L, int, Q> call(vec<L, T, Q> const& x)
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{
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return detail::functor1<L, int, T, Q>::call(compute_findMSB_64, x);
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}
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};
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# endif
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# endif//GLM_HAS_BITSCAN_WINDOWS
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}//namespace detail
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// uaddCarry
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GLM_FUNC_QUALIFIER uint uaddCarry(uint const& x, uint const& y, uint & Carry)
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{
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uint64 const Value64(static_cast<uint64>(x) + static_cast<uint64>(y));
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uint64 const Max32((static_cast<uint64>(1) << static_cast<uint64>(32)) - static_cast<uint64>(1));
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Carry = Value64 > Max32 ? 1u : 0u;
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return static_cast<uint32>(Value64 % (Max32 + static_cast<uint64>(1)));
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}
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template<length_t L, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, uint, Q> uaddCarry(vec<L, uint, Q> const& x, vec<L, uint, Q> const& y, vec<L, uint, Q>& Carry)
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{
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vec<L, uint64, Q> Value64(vec<L, uint64, Q>(x) + vec<L, uint64, Q>(y));
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vec<L, uint64, Q> Max32((static_cast<uint64>(1) << static_cast<uint64>(32)) - static_cast<uint64>(1));
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Carry = mix(vec<L, uint32, Q>(0), vec<L, uint32, Q>(1), greaterThan(Value64, Max32));
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return vec<L, uint32, Q>(Value64 % (Max32 + static_cast<uint64>(1)));
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}
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// usubBorrow
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GLM_FUNC_QUALIFIER uint usubBorrow(uint const& x, uint const& y, uint & Borrow)
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{
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GLM_STATIC_ASSERT(sizeof(uint) == sizeof(uint32), "uint and uint32 size mismatch");
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Borrow = x >= y ? static_cast<uint32>(0) : static_cast<uint32>(1);
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if(y >= x)
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return y - x;
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else
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return static_cast<uint32>((static_cast<int64>(1) << static_cast<int64>(32)) + (static_cast<int64>(y) - static_cast<int64>(x)));
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}
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template<length_t L, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, uint, Q> usubBorrow(vec<L, uint, Q> const& x, vec<L, uint, Q> const& y, vec<L, uint, Q>& Borrow)
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{
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Borrow = mix(vec<L, uint, Q>(1), vec<L, uint, Q>(0), greaterThanEqual(x, y));
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vec<L, uint, Q> const YgeX(y - x);
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vec<L, uint, Q> const XgeY(vec<L, uint32, Q>((static_cast<int64>(1) << static_cast<int64>(32)) + (vec<L, int64, Q>(y) - vec<L, int64, Q>(x))));
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return mix(XgeY, YgeX, greaterThanEqual(y, x));
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}
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// umulExtended
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GLM_FUNC_QUALIFIER void umulExtended(uint const& x, uint const& y, uint & msb, uint & lsb)
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{
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GLM_STATIC_ASSERT(sizeof(uint) == sizeof(uint32), "uint and uint32 size mismatch");
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uint64 Value64 = static_cast<uint64>(x) * static_cast<uint64>(y);
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msb = static_cast<uint>(Value64 >> static_cast<uint64>(32));
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lsb = static_cast<uint>(Value64);
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}
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template<length_t L, qualifier Q>
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GLM_FUNC_QUALIFIER void umulExtended(vec<L, uint, Q> const& x, vec<L, uint, Q> const& y, vec<L, uint, Q>& msb, vec<L, uint, Q>& lsb)
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{
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GLM_STATIC_ASSERT(sizeof(uint) == sizeof(uint32), "uint and uint32 size mismatch");
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vec<L, uint64, Q> Value64(vec<L, uint64, Q>(x) * vec<L, uint64, Q>(y));
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msb = vec<L, uint32, Q>(Value64 >> static_cast<uint64>(32));
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lsb = vec<L, uint32, Q>(Value64);
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}
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// imulExtended
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GLM_FUNC_QUALIFIER void imulExtended(int x, int y, int& msb, int& lsb)
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{
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GLM_STATIC_ASSERT(sizeof(int) == sizeof(int32), "int and int32 size mismatch");
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int64 Value64 = static_cast<int64>(x) * static_cast<int64>(y);
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msb = static_cast<int>(Value64 >> static_cast<int64>(32));
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lsb = static_cast<int>(Value64);
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}
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template<length_t L, qualifier Q>
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GLM_FUNC_QUALIFIER void imulExtended(vec<L, int, Q> const& x, vec<L, int, Q> const& y, vec<L, int, Q>& msb, vec<L, int, Q>& lsb)
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{
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GLM_STATIC_ASSERT(sizeof(int) == sizeof(int32), "int and int32 size mismatch");
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vec<L, int64, Q> Value64(vec<L, int64, Q>(x) * vec<L, int64, Q>(y));
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lsb = vec<L, int32, Q>(Value64 & static_cast<int64>(0xFFFFFFFF));
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msb = vec<L, int32, Q>((Value64 >> static_cast<int64>(32)) & static_cast<int64>(0xFFFFFFFF));
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}
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// bitfieldExtract
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType bitfieldExtract(genIUType Value, int Offset, int Bits)
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{
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return bitfieldExtract(vec<1, genIUType>(Value), Offset, Bits).x;
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> bitfieldExtract(vec<L, T, Q> const& Value, int Offset, int Bits)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_integer, "'bitfieldExtract' only accept integer inputs");
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return (Value >> static_cast<T>(Offset)) & static_cast<T>(detail::mask(Bits));
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}
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// bitfieldInsert
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType bitfieldInsert(genIUType const& Base, genIUType const& Insert, int Offset, int Bits)
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{
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return bitfieldInsert(vec<1, genIUType>(Base), vec<1, genIUType>(Insert), Offset, Bits).x;
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> bitfieldInsert(vec<L, T, Q> const& Base, vec<L, T, Q> const& Insert, int Offset, int Bits)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_integer, "'bitfieldInsert' only accept integer values");
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T const Mask = static_cast<T>(detail::mask(Bits) << Offset);
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return (Base & ~Mask) | (Insert & Mask);
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}
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// bitfieldReverse
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template<typename genType>
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GLM_FUNC_QUALIFIER genType bitfieldReverse(genType x)
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{
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return bitfieldReverse(glm::vec<1, genType, glm::defaultp>(x)).x;
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> bitfieldReverse(vec<L, T, Q> const& v)
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{
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vec<L, T, Q> x(v);
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x = detail::compute_bitfieldReverseStep<L, T, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 2>::call(x, static_cast<T>(0x5555555555555555ull), static_cast<T>( 1));
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x = detail::compute_bitfieldReverseStep<L, T, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 4>::call(x, static_cast<T>(0x3333333333333333ull), static_cast<T>( 2));
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x = detail::compute_bitfieldReverseStep<L, T, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 8>::call(x, static_cast<T>(0x0F0F0F0F0F0F0F0Full), static_cast<T>( 4));
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x = detail::compute_bitfieldReverseStep<L, T, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 16>::call(x, static_cast<T>(0x00FF00FF00FF00FFull), static_cast<T>( 8));
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x = detail::compute_bitfieldReverseStep<L, T, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 32>::call(x, static_cast<T>(0x0000FFFF0000FFFFull), static_cast<T>(16));
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x = detail::compute_bitfieldReverseStep<L, T, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 64>::call(x, static_cast<T>(0x00000000FFFFFFFFull), static_cast<T>(32));
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return x;
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}
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// bitCount
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template<typename genType>
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GLM_FUNC_QUALIFIER int bitCount(genType x)
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{
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return bitCount(glm::vec<1, genType, glm::defaultp>(x)).x;
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, int, Q> bitCount(vec<L, T, Q> const& v)
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{
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# if GLM_COMPILER & GLM_COMPILER_VC
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# pragma warning(push)
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# pragma warning(disable : 4310) //cast truncates constant value
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# endif
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vec<L, typename detail::make_unsigned<T>::type, Q> x(*reinterpret_cast<vec<L, typename detail::make_unsigned<T>::type, Q> const *>(&v));
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x = detail::compute_bitfieldBitCountStep<L, typename detail::make_unsigned<T>::type, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 2>::call(x, typename detail::make_unsigned<T>::type(0x5555555555555555ull), typename detail::make_unsigned<T>::type( 1));
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x = detail::compute_bitfieldBitCountStep<L, typename detail::make_unsigned<T>::type, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 4>::call(x, typename detail::make_unsigned<T>::type(0x3333333333333333ull), typename detail::make_unsigned<T>::type( 2));
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x = detail::compute_bitfieldBitCountStep<L, typename detail::make_unsigned<T>::type, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 8>::call(x, typename detail::make_unsigned<T>::type(0x0F0F0F0F0F0F0F0Full), typename detail::make_unsigned<T>::type( 4));
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x = detail::compute_bitfieldBitCountStep<L, typename detail::make_unsigned<T>::type, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 16>::call(x, typename detail::make_unsigned<T>::type(0x00FF00FF00FF00FFull), typename detail::make_unsigned<T>::type( 8));
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x = detail::compute_bitfieldBitCountStep<L, typename detail::make_unsigned<T>::type, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 32>::call(x, typename detail::make_unsigned<T>::type(0x0000FFFF0000FFFFull), typename detail::make_unsigned<T>::type(16));
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x = detail::compute_bitfieldBitCountStep<L, typename detail::make_unsigned<T>::type, Q, detail::is_aligned<Q>::value, sizeof(T) * 8>= 64>::call(x, typename detail::make_unsigned<T>::type(0x00000000FFFFFFFFull), typename detail::make_unsigned<T>::type(32));
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return vec<L, int, Q>(x);
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# if GLM_COMPILER & GLM_COMPILER_VC
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# pragma warning(pop)
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# endif
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}
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// findLSB
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template<typename genIUType>
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GLM_FUNC_QUALIFIER int findLSB(genIUType Value)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'findLSB' only accept integer values");
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return detail::compute_findLSB<genIUType, sizeof(genIUType) * 8>::call(Value);
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, int, Q> findLSB(vec<L, T, Q> const& x)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_integer, "'findLSB' only accept integer values");
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return detail::functor1<L, int, T, Q>::call(findLSB, x);
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}
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// findMSB
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template<typename genIUType>
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GLM_FUNC_QUALIFIER int findMSB(genIUType v)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'findMSB' only accept integer values");
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return findMSB(vec<1, genIUType>(v)).x;
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, int, Q> findMSB(vec<L, T, Q> const& v)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_integer, "'findMSB' only accept integer values");
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return detail::compute_findMSB_vec<L, T, Q, sizeof(T) * 8>::call(v);
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}
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}//namespace glm
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#if GLM_ARCH != GLM_ARCH_PURE && GLM_HAS_UNRESTRICTED_UNIONS
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# include "func_integer_simd.inl"
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#endif
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