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Diffstat (limited to 'src/include/glm/gtc/random.inl')
| -rw-r--r-- | src/include/glm/gtc/random.inl | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/src/include/glm/gtc/random.inl b/src/include/glm/gtc/random.inl new file mode 100644 index 0000000..ff5d365 --- /dev/null +++ b/src/include/glm/gtc/random.inl @@ -0,0 +1,303 @@ +#include "../geometric.hpp"
+#include "../exponential.hpp"
+#include "../trigonometric.hpp"
+#include "../detail/type_vec1.hpp"
+#include <cstdlib>
+#include <ctime>
+#include <cassert>
+#include <cmath>
+
+namespace glm{
+namespace detail
+{
+ template <length_t L, typename T, qualifier Q>
+ struct compute_rand
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call();
+ };
+
+ template <qualifier P>
+ struct compute_rand<1, uint8, P>
+ {
+ GLM_FUNC_QUALIFIER static vec<1, uint8, P> call()
+ {
+ return vec<1, uint8, P>(
+ std::rand() % std::numeric_limits<uint8>::max());
+ }
+ };
+
+ template <qualifier P>
+ struct compute_rand<2, uint8, P>
+ {
+ GLM_FUNC_QUALIFIER static vec<2, uint8, P> call()
+ {
+ return vec<2, uint8, P>(
+ std::rand() % std::numeric_limits<uint8>::max(),
+ std::rand() % std::numeric_limits<uint8>::max());
+ }
+ };
+
+ template <qualifier P>
+ struct compute_rand<3, uint8, P>
+ {
+ GLM_FUNC_QUALIFIER static vec<3, uint8, P> call()
+ {
+ return vec<3, uint8, P>(
+ std::rand() % std::numeric_limits<uint8>::max(),
+ std::rand() % std::numeric_limits<uint8>::max(),
+ std::rand() % std::numeric_limits<uint8>::max());
+ }
+ };
+
+ template <qualifier P>
+ struct compute_rand<4, uint8, P>
+ {
+ GLM_FUNC_QUALIFIER static vec<4, uint8, P> call()
+ {
+ return vec<4, uint8, P>(
+ std::rand() % std::numeric_limits<uint8>::max(),
+ std::rand() % std::numeric_limits<uint8>::max(),
+ std::rand() % std::numeric_limits<uint8>::max(),
+ std::rand() % std::numeric_limits<uint8>::max());
+ }
+ };
+
+ template <length_t L, qualifier Q>
+ struct compute_rand<L, uint16, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint16, Q> call()
+ {
+ return
+ (vec<L, uint16, Q>(compute_rand<L, uint8, Q>::call()) << static_cast<uint16>(8)) |
+ (vec<L, uint16, Q>(compute_rand<L, uint8, Q>::call()) << static_cast<uint16>(0));
+ }
+ };
+
+ template <length_t L, qualifier Q>
+ struct compute_rand<L, uint32, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint32, Q> call()
+ {
+ return
+ (vec<L, uint32, Q>(compute_rand<L, uint16, Q>::call()) << static_cast<uint32>(16)) |
+ (vec<L, uint32, Q>(compute_rand<L, uint16, Q>::call()) << static_cast<uint32>(0));
+ }
+ };
+
+ template <length_t L, qualifier Q>
+ struct compute_rand<L, uint64, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint64, Q> call()
+ {
+ return
+ (vec<L, uint64, Q>(compute_rand<L, uint32, Q>::call()) << static_cast<uint64>(32)) |
+ (vec<L, uint64, Q>(compute_rand<L, uint32, Q>::call()) << static_cast<uint64>(0));
+ }
+ };
+
+ template <length_t L, typename T, qualifier Q>
+ struct compute_linearRand
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& Min, vec<L, T, Q> const& Max);
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, int8, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, int8, Q> call(vec<L, int8, Q> const& Min, vec<L, int8, Q> const& Max)
+ {
+ return (vec<L, int8, Q>(compute_rand<L, uint8, Q>::call() % vec<L, uint8, Q>(Max + static_cast<int8>(1) - Min))) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, uint8, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint8, Q> call(vec<L, uint8, Q> const& Min, vec<L, uint8, Q> const& Max)
+ {
+ return (compute_rand<L, uint8, Q>::call() % (Max + static_cast<uint8>(1) - Min)) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, int16, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, int16, Q> call(vec<L, int16, Q> const& Min, vec<L, int16, Q> const& Max)
+ {
+ return (vec<L, int16, Q>(compute_rand<L, uint16, Q>::call() % vec<L, uint16, Q>(Max + static_cast<int16>(1) - Min))) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, uint16, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint16, Q> call(vec<L, uint16, Q> const& Min, vec<L, uint16, Q> const& Max)
+ {
+ return (compute_rand<L, uint16, Q>::call() % (Max + static_cast<uint16>(1) - Min)) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, int32, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, int32, Q> call(vec<L, int32, Q> const& Min, vec<L, int32, Q> const& Max)
+ {
+ return (vec<L, int32, Q>(compute_rand<L, uint32, Q>::call() % vec<L, uint32, Q>(Max + static_cast<int32>(1) - Min))) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, uint32, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint32, Q> call(vec<L, uint32, Q> const& Min, vec<L, uint32, Q> const& Max)
+ {
+ return (compute_rand<L, uint32, Q>::call() % (Max + static_cast<uint32>(1) - Min)) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, int64, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, int64, Q> call(vec<L, int64, Q> const& Min, vec<L, int64, Q> const& Max)
+ {
+ return (vec<L, int64, Q>(compute_rand<L, uint64, Q>::call() % vec<L, uint64, Q>(Max + static_cast<int64>(1) - Min))) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, uint64, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, uint64, Q> call(vec<L, uint64, Q> const& Min, vec<L, uint64, Q> const& Max)
+ {
+ return (compute_rand<L, uint64, Q>::call() % (Max + static_cast<uint64>(1) - Min)) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, float, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, float, Q> call(vec<L, float, Q> const& Min, vec<L, float, Q> const& Max)
+ {
+ return vec<L, float, Q>(compute_rand<L, uint32, Q>::call()) / static_cast<float>(std::numeric_limits<uint32>::max()) * (Max - Min) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, double, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, double, Q> call(vec<L, double, Q> const& Min, vec<L, double, Q> const& Max)
+ {
+ return vec<L, double, Q>(compute_rand<L, uint64, Q>::call()) / static_cast<double>(std::numeric_limits<uint64>::max()) * (Max - Min) + Min;
+ }
+ };
+
+ template<length_t L, qualifier Q>
+ struct compute_linearRand<L, long double, Q>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, long double, Q> call(vec<L, long double, Q> const& Min, vec<L, long double, Q> const& Max)
+ {
+ return vec<L, long double, Q>(compute_rand<L, uint64, Q>::call()) / static_cast<long double>(std::numeric_limits<uint64>::max()) * (Max - Min) + Min;
+ }
+ };
+}//namespace detail
+
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType linearRand(genType Min, genType Max)
+ {
+ return detail::compute_linearRand<1, genType, highp>::call(
+ vec<1, genType, highp>(Min),
+ vec<1, genType, highp>(Max)).x;
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> linearRand(vec<L, T, Q> const& Min, vec<L, T, Q> const& Max)
+ {
+ return detail::compute_linearRand<L, T, Q>::call(Min, Max);
+ }
+
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType gaussRand(genType Mean, genType Deviation)
+ {
+ genType w, x1, x2;
+
+ do
+ {
+ x1 = linearRand(genType(-1), genType(1));
+ x2 = linearRand(genType(-1), genType(1));
+
+ w = x1 * x1 + x2 * x2;
+ } while(w > genType(1));
+
+ return static_cast<genType>(x2 * Deviation * Deviation * sqrt((genType(-2) * log(w)) / w) + Mean);
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> gaussRand(vec<L, T, Q> const& Mean, vec<L, T, Q> const& Deviation)
+ {
+ return detail::functor2<vec, L, T, Q>::call(gaussRand, Mean, Deviation);
+ }
+
+ template<typename T>
+ GLM_FUNC_QUALIFIER vec<2, T, defaultp> diskRand(T Radius)
+ {
+ assert(Radius > static_cast<T>(0));
+
+ vec<2, T, defaultp> Result(T(0));
+ T LenRadius(T(0));
+
+ do
+ {
+ Result = linearRand(
+ vec<2, T, defaultp>(-Radius),
+ vec<2, T, defaultp>(Radius));
+ LenRadius = length(Result);
+ }
+ while(LenRadius > Radius);
+
+ return Result;
+ }
+
+ template<typename T>
+ GLM_FUNC_QUALIFIER vec<3, T, defaultp> ballRand(T Radius)
+ {
+ assert(Radius > static_cast<T>(0));
+
+ vec<3, T, defaultp> Result(T(0));
+ T LenRadius(T(0));
+
+ do
+ {
+ Result = linearRand(
+ vec<3, T, defaultp>(-Radius),
+ vec<3, T, defaultp>(Radius));
+ LenRadius = length(Result);
+ }
+ while(LenRadius > Radius);
+
+ return Result;
+ }
+
+ template<typename T>
+ GLM_FUNC_QUALIFIER vec<2, T, defaultp> circularRand(T Radius)
+ {
+ assert(Radius > static_cast<T>(0));
+
+ T a = linearRand(T(0), static_cast<T>(6.283185307179586476925286766559));
+ return vec<2, T, defaultp>(glm::cos(a), glm::sin(a)) * Radius;
+ }
+
+ template<typename T>
+ GLM_FUNC_QUALIFIER vec<3, T, defaultp> sphericalRand(T Radius)
+ {
+ assert(Radius > static_cast<T>(0));
+
+ T theta = linearRand(T(0), T(6.283185307179586476925286766559f));
+ T phi = std::acos(linearRand(T(-1.0f), T(1.0f)));
+
+ T x = std::sin(phi) * std::cos(theta);
+ T y = std::sin(phi) * std::sin(theta);
+ T z = std::cos(phi);
+
+ return vec<3, T, defaultp>(x, y, z) * Radius;
+ }
+}//namespace glm
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