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283 lines
12 KiB
C++
283 lines
12 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
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#pragma once
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#ifndef NV_CORE_UTILS_H
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#define NV_CORE_UTILS_H
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#include "Debug.h" // nvDebugCheck
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#include <new> // for placement new
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// Just in case. Grrr.
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#undef min
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#undef max
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#define NV_INT8_MIN (-128)
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#define NV_INT8_MAX 127
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#define NV_UINT8_MAX 255
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#define NV_INT16_MIN (-32767-1)
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#define NV_INT16_MAX 32767
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#define NV_UINT16_MAX 0xffff
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#define NV_INT32_MIN (-2147483647-1)
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#define NV_INT32_MAX 2147483647
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#define NV_UINT32_MAX 0xffffffff
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#define NV_INT64_MAX POSH_I64(9223372036854775807)
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#define NV_INT64_MIN (-POSH_I64(9223372036854775807)-1)
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#define NV_UINT64_MAX POSH_U64(0xffffffffffffffff)
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#define NV_HALF_MAX 65504.0F
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#define NV_FLOAT_MAX 3.402823466e+38F
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#define NV_INTEGER_TO_FLOAT_MAX 16777217 // Largest integer such that it and all smaller integers can be stored in a 32bit float.
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namespace nv
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{
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// Less error prone than casting. From CB:
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// http://cbloomrants.blogspot.com/2011/06/06-17-11-c-casting-is-devil.html
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// These intentionally look like casts.
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// uint32 casts:
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template <typename T> inline uint32 U32(T x) { return x; }
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template <> inline uint32 U32<uint64>(uint64 x) { nvDebugCheck(x <= NV_UINT32_MAX); return (uint32)x; }
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template <> inline uint32 U32<int64>(int64 x) { nvDebugCheck(x >= 0 && x <= NV_UINT32_MAX); return (uint32)x; }
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//template <> inline uint32 U32<uint32>(uint32 x) { return x; }
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template <> inline uint32 U32<int32>(int32 x) { nvDebugCheck(x >= 0); return (uint32)x; }
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//template <> inline uint32 U32<uint16>(uint16 x) { return x; }
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template <> inline uint32 U32<int16>(int16 x) { nvDebugCheck(x >= 0); return (uint32)x; }
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//template <> inline uint32 U32<uint8>(uint8 x) { return x; }
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template <> inline uint32 U32<int8>(int8 x) { nvDebugCheck(x >= 0); return (uint32)x; }
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// int32 casts:
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template <typename T> inline int32 I32(T x) { return x; }
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template <> inline int32 I32<uint64>(uint64 x) { nvDebugCheck(x <= NV_INT32_MAX); return (int32)x; }
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template <> inline int32 I32<int64>(int64 x) { nvDebugCheck(x >= NV_INT32_MIN && x <= NV_UINT32_MAX); return (int32)x; }
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template <> inline int32 I32<uint32>(uint32 x) { nvDebugCheck(x <= NV_INT32_MAX); return (int32)x; }
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//template <> inline int32 I32<int32>(int32 x) { return x; }
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//template <> inline int32 I32<uint16>(uint16 x) { return x; }
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//template <> inline int32 I32<int16>(int16 x) { return x; }
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//template <> inline int32 I32<uint8>(uint8 x) { return x; }
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//template <> inline int32 I32<int8>(int8 x) { return x; }
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// uint16 casts:
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template <typename T> inline uint16 U16(T x) { return x; }
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template <> inline uint16 U16<uint64>(uint64 x) { nvDebugCheck(x <= NV_UINT16_MAX); return (uint16)x; }
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template <> inline uint16 U16<int64>(int64 x) { nvDebugCheck(x >= 0 && x <= NV_UINT16_MAX); return (uint16)x; }
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template <> inline uint16 U16<uint32>(uint32 x) { nvDebugCheck(x <= NV_UINT16_MAX); return (uint16)x; }
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template <> inline uint16 U16<int32>(int32 x) { nvDebugCheck(x >= 0 && x <= NV_UINT16_MAX); return (uint16)x; }
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//template <> inline uint16 U16<uint16>(uint16 x) { return x; }
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template <> inline uint16 U16<int16>(int16 x) { nvDebugCheck(x >= 0); return (uint16)x; }
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//template <> inline uint16 U16<uint8>(uint8 x) { return x; }
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template <> inline uint16 U16<int8>(int8 x) { nvDebugCheck(x >= 0); return (uint16)x; }
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// int16 casts:
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template <typename T> inline int16 I16(T x) { return x; }
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template <> inline int16 I16<uint64>(uint64 x) { nvDebugCheck(x <= NV_INT16_MAX); return (int16)x; }
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template <> inline int16 I16<int64>(int64 x) { nvDebugCheck(x >= NV_INT16_MIN && x <= NV_UINT16_MAX); return (int16)x; }
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template <> inline int16 I16<uint32>(uint32 x) { nvDebugCheck(x <= NV_INT16_MAX); return (int16)x; }
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template <> inline int16 I16<int32>(int32 x) { nvDebugCheck(x >= NV_INT16_MIN && x <= NV_UINT16_MAX); return (int16)x; }
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template <> inline int16 I16<uint16>(uint16 x) { nvDebugCheck(x <= NV_INT16_MAX); return (int16)x; }
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//template <> inline int16 I16<int16>(int16 x) { return x; }
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//template <> inline int16 I16<uint8>(uint8 x) { return x; }
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//template <> inline int16 I16<int8>(int8 x) { return x; }
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// uint8 casts:
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template <typename T> inline uint8 U8(T x) { return x; }
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template <> inline uint8 U8<uint64>(uint64 x) { nvDebugCheck(x <= NV_UINT8_MAX); return (uint8)x; }
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template <> inline uint8 U8<int64>(int64 x) { nvDebugCheck(x >= 0 && x <= NV_UINT8_MAX); return (uint8)x; }
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template <> inline uint8 U8<uint32>(uint32 x) { nvDebugCheck(x <= NV_UINT8_MAX); return (uint8)x; }
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template <> inline uint8 U8<int32>(int32 x) { nvDebugCheck(x >= 0 && x <= NV_UINT8_MAX); return (uint8)x; }
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template <> inline uint8 U8<uint16>(uint16 x) { nvDebugCheck(x <= NV_UINT8_MAX); return (uint8)x; }
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template <> inline uint8 U8<int16>(int16 x) { nvDebugCheck(x >= 0 && x <= NV_UINT8_MAX); return (uint8)x; }
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//template <> inline uint8 U8<uint8>(uint8 x) { return x; }
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template <> inline uint8 U8<int8>(int8 x) { nvDebugCheck(x >= 0); return (uint8)x; }
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//template <> inline uint8 U8<float>(int8 x) { nvDebugCheck(x >= 0.0f && x <= 255.0f); return (uint8)x; }
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// int8 casts:
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template <typename T> inline int8 I8(T x) { return x; }
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template <> inline int8 I8<uint64>(uint64 x) { nvDebugCheck(x <= NV_INT8_MAX); return (int8)x; }
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template <> inline int8 I8<int64>(int64 x) { nvDebugCheck(x >= NV_INT8_MIN && x <= NV_UINT8_MAX); return (int8)x; }
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template <> inline int8 I8<uint32>(uint32 x) { nvDebugCheck(x <= NV_INT8_MAX); return (int8)x; }
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template <> inline int8 I8<int32>(int32 x) { nvDebugCheck(x >= NV_INT8_MIN && x <= NV_UINT8_MAX); return (int8)x; }
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template <> inline int8 I8<uint16>(uint16 x) { nvDebugCheck(x <= NV_INT8_MAX); return (int8)x; }
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template <> inline int8 I8<int16>(int16 x) { nvDebugCheck(x >= NV_INT8_MIN && x <= NV_UINT8_MAX); return (int8)x; }
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template <> inline int8 I8<uint8>(uint8 x) { nvDebugCheck(x <= NV_INT8_MAX); return (int8)x; }
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//template <> inline int8 I8<int8>(int8 x) { return x; }
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// float casts:
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template <typename T> inline float F32(T x) { return x; }
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template <> inline float F32<uint64>(uint64 x) { nvDebugCheck(x <= NV_INTEGER_TO_FLOAT_MAX); return (float)x; }
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template <> inline float F32<int64>(int64 x) { nvDebugCheck(x >= -NV_INTEGER_TO_FLOAT_MAX && x <= NV_INTEGER_TO_FLOAT_MAX); return (float)x; }
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template <> inline float F32<uint32>(uint32 x) { nvDebugCheck(x <= NV_INTEGER_TO_FLOAT_MAX); return (float)x; }
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template <> inline float F32<int32>(int32 x) { nvDebugCheck(x >= -NV_INTEGER_TO_FLOAT_MAX && x <= NV_INTEGER_TO_FLOAT_MAX); return (float)x; }
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// The compiler should not complain about these conversions:
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//template <> inline float F32<uint16>(uint16 x) { nvDebugCheck(return (float)x; }
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//template <> inline float F32<int16>(int16 x) { nvDebugCheck(return (float)x; }
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//template <> inline float F32<uint8>(uint8 x) { nvDebugCheck(return (float)x; }
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//template <> inline float F32<int8>(int8 x) { nvDebugCheck(return (float)x; }
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/// Swap two values.
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template <typename T>
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inline void swap(T & a, T & b)
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{
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T temp(a);
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a = b;
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b = temp;
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}
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/// Return the maximum of the two arguments. For floating point values, it returns the second value if the first is NaN.
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template <typename T>
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//inline const T & max(const T & a, const T & b)
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inline T max(const T & a, const T & b)
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{
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return (b < a) ? a : b;
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}
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/// Return the maximum of the four arguments.
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template <typename T>
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//inline const T & max4(const T & a, const T & b, const T & c)
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inline T max4(const T & a, const T & b, const T & c, const T & d)
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{
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return max(max(a, b), max(c, d));
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}
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/// Return the maximum of the three arguments.
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template <typename T>
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//inline const T & max3(const T & a, const T & b, const T & c)
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inline T max3(const T & a, const T & b, const T & c)
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{
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return max(a, max(b, c));
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}
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/// Return the minimum of two values.
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template <typename T>
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//inline const T & min(const T & a, const T & b)
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inline T min(const T & a, const T & b)
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{
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return (a < b) ? a : b;
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}
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/// Return the maximum of the three arguments.
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template <typename T>
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//inline const T & min3(const T & a, const T & b, const T & c)
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inline T min3(const T & a, const T & b, const T & c)
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{
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return min(a, min(b, c));
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}
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/// Clamp between two values.
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template <typename T>
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//inline const T & clamp(const T & x, const T & a, const T & b)
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inline T clamp(const T & x, const T & a, const T & b)
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{
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return min(max(x, a), b);
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}
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/** Return the next power of two.
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* @see http://graphics.stanford.edu/~seander/bithacks.html
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* @warning Behaviour for 0 is undefined.
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* @note isPowerOfTwo(x) == true -> nextPowerOfTwo(x) == x
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* @note nextPowerOfTwo(x) = 2 << log2(x-1)
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*/
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inline uint nextPowerOfTwo( uint x )
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{
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nvDebugCheck( x != 0 );
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#if 1 // On modern CPUs this is supposed to be as fast as using the bsr instruction.
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x--;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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return x+1;
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#else
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uint p = 1;
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while( x > p ) {
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p += p;
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}
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return p;
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#endif
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}
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/// Return true if @a n is a power of two.
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inline bool isPowerOfTwo( uint n )
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{
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return (n & (n-1)) == 0;
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}
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// @@ Move this to utils?
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/// Delete all the elements of a container.
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template <typename T>
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void deleteAll(T & container)
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{
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for (typename T::PseudoIndex i = container.start(); !container.isDone(i); container.advance(i))
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{
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delete container[i];
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}
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}
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// @@ Specialize these methods for numeric, pointer, and pod types.
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template <typename T>
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void construct_range(T * restrict ptr, uint new_size, uint old_size) {
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for (uint i = old_size; i < new_size; i++) {
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new(ptr+i) T; // placement new
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}
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}
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template <typename T>
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void construct_range(T * restrict ptr, uint new_size, uint old_size, const T & elem) {
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for (uint i = old_size; i < new_size; i++) {
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new(ptr+i) T(elem); // placement new
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}
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}
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template <typename T>
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void construct_range(T * restrict ptr, uint new_size, uint old_size, const T * src) {
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for (uint i = old_size; i < new_size; i++) {
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new(ptr+i) T(src[i]); // placement new
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}
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}
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template <typename T>
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void destroy_range(T * restrict ptr, uint new_size, uint old_size) {
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for (uint i = new_size; i < old_size; i++) {
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(ptr+i)->~T(); // Explicit call to the destructor
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}
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}
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template <typename T>
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void fill(T * restrict dst, uint count, const T & value) {
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for (uint i = 0; i < count; i++) {
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dst[i] = value;
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}
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}
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template <typename T>
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void copy_range(T * restrict dst, const T * restrict src, uint count) {
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for (uint i = 0; i < count; i++) {
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dst[i] = src[i];
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}
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}
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template <typename T>
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bool find(const T & element, const T * restrict ptr, uint begin, uint end, uint * index) {
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for (uint i = begin; i < end; i++) {
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if (ptr[i] == element) {
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if (index != NULL) *index = i;
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return true;
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}
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}
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return false;
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}
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} // nv namespace
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#endif // NV_CORE_UTILS_H
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