diff options
Diffstat (limited to 'src/include/glm/ext/scalar_integer.inl')
| -rw-r--r-- | src/include/glm/ext/scalar_integer.inl | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/include/glm/ext/scalar_integer.inl b/src/include/glm/ext/scalar_integer.inl new file mode 100644 index 0000000..0cc286f --- /dev/null +++ b/src/include/glm/ext/scalar_integer.inl @@ -0,0 +1,243 @@ +#include "../integer.hpp"
+
+namespace glm{
+namespace detail
+{
+ template<length_t L, typename T, qualifier Q, bool compute = false>
+ struct compute_ceilShift
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T)
+ {
+ return v;
+ }
+ };
+
+ template<length_t L, typename T, qualifier Q>
+ struct compute_ceilShift<L, T, Q, true>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T Shift)
+ {
+ return v | (v >> Shift);
+ }
+ };
+
+ template<length_t L, typename T, qualifier Q, bool isSigned = true>
+ struct compute_ceilPowerOfTwo
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
+ {
+ GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
+
+ vec<L, T, Q> const Sign(sign(x));
+
+ vec<L, T, Q> v(abs(x));
+
+ v = v - static_cast<T>(1);
+ v = v | (v >> static_cast<T>(1));
+ v = v | (v >> static_cast<T>(2));
+ v = v | (v >> static_cast<T>(4));
+ v = compute_ceilShift<L, T, Q, sizeof(T) >= 2>::call(v, 8);
+ v = compute_ceilShift<L, T, Q, sizeof(T) >= 4>::call(v, 16);
+ v = compute_ceilShift<L, T, Q, sizeof(T) >= 8>::call(v, 32);
+ return (v + static_cast<T>(1)) * Sign;
+ }
+ };
+
+ template<length_t L, typename T, qualifier Q>
+ struct compute_ceilPowerOfTwo<L, T, Q, false>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
+ {
+ GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
+
+ vec<L, T, Q> v(x);
+
+ v = v - static_cast<T>(1);
+ v = v | (v >> static_cast<T>(1));
+ v = v | (v >> static_cast<T>(2));
+ v = v | (v >> static_cast<T>(4));
+ v = compute_ceilShift<L, T, Q, sizeof(T) >= 2>::call(v, 8);
+ v = compute_ceilShift<L, T, Q, sizeof(T) >= 4>::call(v, 16);
+ v = compute_ceilShift<L, T, Q, sizeof(T) >= 8>::call(v, 32);
+ return v + static_cast<T>(1);
+ }
+ };
+
+ template<bool is_float, bool is_signed>
+ struct compute_ceilMultiple{};
+
+ template<>
+ struct compute_ceilMultiple<true, true>
+ {
+ template<typename genType>
+ GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+ {
+ if(Source > genType(0))
+ return Source + (Multiple - std::fmod(Source, Multiple));
+ else
+ return Source + std::fmod(-Source, Multiple);
+ }
+ };
+
+ template<>
+ struct compute_ceilMultiple<false, false>
+ {
+ template<typename genType>
+ GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+ {
+ genType Tmp = Source - genType(1);
+ return Tmp + (Multiple - (Tmp % Multiple));
+ }
+ };
+
+ template<>
+ struct compute_ceilMultiple<false, true>
+ {
+ template<typename genType>
+ GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+ {
+ assert(Multiple > genType(0));
+ if(Source > genType(0))
+ {
+ genType Tmp = Source - genType(1);
+ return Tmp + (Multiple - (Tmp % Multiple));
+ }
+ else
+ return Source + (-Source % Multiple);
+ }
+ };
+
+ template<bool is_float, bool is_signed>
+ struct compute_floorMultiple{};
+
+ template<>
+ struct compute_floorMultiple<true, true>
+ {
+ template<typename genType>
+ GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+ {
+ if(Source >= genType(0))
+ return Source - std::fmod(Source, Multiple);
+ else
+ return Source - std::fmod(Source, Multiple) - Multiple;
+ }
+ };
+
+ template<>
+ struct compute_floorMultiple<false, false>
+ {
+ template<typename genType>
+ GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+ {
+ if(Source >= genType(0))
+ return Source - Source % Multiple;
+ else
+ {
+ genType Tmp = Source + genType(1);
+ return Tmp - Tmp % Multiple - Multiple;
+ }
+ }
+ };
+
+ template<>
+ struct compute_floorMultiple<false, true>
+ {
+ template<typename genType>
+ GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+ {
+ if(Source >= genType(0))
+ return Source - Source % Multiple;
+ else
+ {
+ genType Tmp = Source + genType(1);
+ return Tmp - Tmp % Multiple - Multiple;
+ }
+ }
+ };
+}//namespace detail
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER bool isPowerOfTwo(genIUType Value)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'isPowerOfTwo' only accept integer inputs");
+
+ genIUType const Result = glm::abs(Value);
+ return !(Result & (Result - 1));
+ }
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER genIUType nextPowerOfTwo(genIUType value)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'nextPowerOfTwo' only accept integer inputs");
+
+ return detail::compute_ceilPowerOfTwo<1, genIUType, defaultp, std::numeric_limits<genIUType>::is_signed>::call(vec<1, genIUType, defaultp>(value)).x;
+ }
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER genIUType prevPowerOfTwo(genIUType value)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'prevPowerOfTwo' only accept integer inputs");
+
+ return isPowerOfTwo(value) ? value : static_cast<genIUType>(static_cast<genIUType>(1) << static_cast<genIUType>(findMSB(value)));
+ }
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER bool isMultiple(genIUType Value, genIUType Multiple)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'isMultiple' only accept integer inputs");
+
+ return isMultiple(vec<1, genIUType>(Value), vec<1, genIUType>(Multiple)).x;
+ }
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER genIUType nextMultiple(genIUType Source, genIUType Multiple)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'nextMultiple' only accept integer inputs");
+
+ return detail::compute_ceilMultiple<std::numeric_limits<genIUType>::is_iec559, std::numeric_limits<genIUType>::is_signed>::call(Source, Multiple);
+ }
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER genIUType prevMultiple(genIUType Source, genIUType Multiple)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'prevMultiple' only accept integer inputs");
+
+ return detail::compute_floorMultiple<std::numeric_limits<genIUType>::is_iec559, std::numeric_limits<genIUType>::is_signed>::call(Source, Multiple);
+ }
+
+ template<typename genIUType>
+ GLM_FUNC_QUALIFIER int findNSB(genIUType x, int significantBitCount)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'findNSB' only accept integer inputs");
+
+ if(bitCount(x) < significantBitCount)
+ return -1;
+
+ genIUType const One = static_cast<genIUType>(1);
+ int bitPos = 0;
+
+ genIUType key = x;
+ int nBitCount = significantBitCount;
+ int Step = sizeof(x) * 8 / 2;
+ while (key > One)
+ {
+ genIUType Mask = static_cast<genIUType>((One << Step) - One);
+ genIUType currentKey = key & Mask;
+ int currentBitCount = bitCount(currentKey);
+ if (nBitCount > currentBitCount)
+ {
+ nBitCount -= currentBitCount;
+ bitPos += Step;
+ key >>= static_cast<genIUType>(Step);
+ }
+ else
+ {
+ key = key & Mask;
+ }
+
+ Step >>= 1;
+ }
+
+ return static_cast<int>(bitPos);
+ }
+}//namespace glm
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