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izenynn
2025-02-17 21:05:45 +01:00
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/// @ref gtc_packing
/// @file glm/gtc/packing.inl
#include "../common.hpp"
#include "../vec2.hpp"
#include "../vec3.hpp"
#include "../vec4.hpp"
#include "../detail/type_half.hpp"
#include <cstring>
#include <limits>
namespace glm{
namespace detail
{
GLM_FUNC_QUALIFIER glm::uint16 float2half(glm::uint32 f)
{
// 10 bits => EE EEEFFFFF
// 11 bits => EEE EEFFFFFF
// Half bits => SEEEEEFF FFFFFFFF
// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF
// 0x00007c00 => 00000000 00000000 01111100 00000000
// 0x000003ff => 00000000 00000000 00000011 11111111
// 0x38000000 => 00111000 00000000 00000000 00000000
// 0x7f800000 => 01111111 10000000 00000000 00000000
// 0x00008000 => 00000000 00000000 10000000 00000000
return
((f >> 16) & 0x8000) | // sign
((((f & 0x7f800000) - 0x38000000) >> 13) & 0x7c00) | // exponential
((f >> 13) & 0x03ff); // Mantissa
}
GLM_FUNC_QUALIFIER glm::uint32 float2packed11(glm::uint32 f)
{
// 10 bits => EE EEEFFFFF
// 11 bits => EEE EEFFFFFF
// Half bits => SEEEEEFF FFFFFFFF
// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF
// 0x000007c0 => 00000000 00000000 00000111 11000000
// 0x00007c00 => 00000000 00000000 01111100 00000000
// 0x000003ff => 00000000 00000000 00000011 11111111
// 0x38000000 => 00111000 00000000 00000000 00000000
// 0x7f800000 => 01111111 10000000 00000000 00000000
// 0x00008000 => 00000000 00000000 10000000 00000000
return
((((f & 0x7f800000) - 0x38000000) >> 17) & 0x07c0) | // exponential
((f >> 17) & 0x003f); // Mantissa
}
GLM_FUNC_QUALIFIER glm::uint32 packed11ToFloat(glm::uint32 p)
{
// 10 bits => EE EEEFFFFF
// 11 bits => EEE EEFFFFFF
// Half bits => SEEEEEFF FFFFFFFF
// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF
// 0x000007c0 => 00000000 00000000 00000111 11000000
// 0x00007c00 => 00000000 00000000 01111100 00000000
// 0x000003ff => 00000000 00000000 00000011 11111111
// 0x38000000 => 00111000 00000000 00000000 00000000
// 0x7f800000 => 01111111 10000000 00000000 00000000
// 0x00008000 => 00000000 00000000 10000000 00000000
return
((((p & 0x07c0) << 17) + 0x38000000) & 0x7f800000) | // exponential
((p & 0x003f) << 17); // Mantissa
}
GLM_FUNC_QUALIFIER glm::uint32 float2packed10(glm::uint32 f)
{
// 10 bits => EE EEEFFFFF
// 11 bits => EEE EEFFFFFF
// Half bits => SEEEEEFF FFFFFFFF
// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF
// 0x0000001F => 00000000 00000000 00000000 00011111
// 0x0000003F => 00000000 00000000 00000000 00111111
// 0x000003E0 => 00000000 00000000 00000011 11100000
// 0x000007C0 => 00000000 00000000 00000111 11000000
// 0x00007C00 => 00000000 00000000 01111100 00000000
// 0x000003FF => 00000000 00000000 00000011 11111111
// 0x38000000 => 00111000 00000000 00000000 00000000
// 0x7f800000 => 01111111 10000000 00000000 00000000
// 0x00008000 => 00000000 00000000 10000000 00000000
return
((((f & 0x7f800000) - 0x38000000) >> 18) & 0x03E0) | // exponential
((f >> 18) & 0x001f); // Mantissa
}
GLM_FUNC_QUALIFIER glm::uint32 packed10ToFloat(glm::uint32 p)
{
// 10 bits => EE EEEFFFFF
// 11 bits => EEE EEFFFFFF
// Half bits => SEEEEEFF FFFFFFFF
// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF
// 0x0000001F => 00000000 00000000 00000000 00011111
// 0x0000003F => 00000000 00000000 00000000 00111111
// 0x000003E0 => 00000000 00000000 00000011 11100000
// 0x000007C0 => 00000000 00000000 00000111 11000000
// 0x00007C00 => 00000000 00000000 01111100 00000000
// 0x000003FF => 00000000 00000000 00000011 11111111
// 0x38000000 => 00111000 00000000 00000000 00000000
// 0x7f800000 => 01111111 10000000 00000000 00000000
// 0x00008000 => 00000000 00000000 10000000 00000000
return
((((p & 0x03E0) << 18) + 0x38000000) & 0x7f800000) | // exponential
((p & 0x001f) << 18); // Mantissa
}
GLM_FUNC_QUALIFIER glm::uint half2float(glm::uint h)
{
return ((h & 0x8000) << 16) | ((( h & 0x7c00) + 0x1C000) << 13) | ((h & 0x03FF) << 13);
}
GLM_FUNC_QUALIFIER glm::uint floatTo11bit(float x)
{
if(x == 0.0f)
return 0u;
else if(glm::isnan(x))
return ~0u;
else if(glm::isinf(x))
return 0x1Fu << 6u;
uint Pack = 0u;
memcpy(&Pack, &x, sizeof(Pack));
return float2packed11(Pack);
}
GLM_FUNC_QUALIFIER float packed11bitToFloat(glm::uint x)
{
if(x == 0)
return 0.0f;
else if(x == ((1 << 11) - 1))
return ~0;//NaN
else if(x == (0x1f << 6))
return ~0;//Inf
uint Result = packed11ToFloat(x);
float Temp = 0;
memcpy(&Temp, &Result, sizeof(Temp));
return Temp;
}
GLM_FUNC_QUALIFIER glm::uint floatTo10bit(float x)
{
if(x == 0.0f)
return 0u;
else if(glm::isnan(x))
return ~0u;
else if(glm::isinf(x))
return 0x1Fu << 5u;
uint Pack = 0;
memcpy(&Pack, &x, sizeof(Pack));
return float2packed10(Pack);
}
GLM_FUNC_QUALIFIER float packed10bitToFloat(glm::uint x)
{
if(x == 0)
return 0.0f;
else if(x == ((1 << 10) - 1))
return ~0;//NaN
else if(x == (0x1f << 5))
return ~0;//Inf
uint Result = packed10ToFloat(x);
float Temp = 0;
memcpy(&Temp, &Result, sizeof(Temp));
return Temp;
}
// GLM_FUNC_QUALIFIER glm::uint f11_f11_f10(float x, float y, float z)
// {
// return ((floatTo11bit(x) & ((1 << 11) - 1)) << 0) | ((floatTo11bit(y) & ((1 << 11) - 1)) << 11) | ((floatTo10bit(z) & ((1 << 10) - 1)) << 22);
// }
union u3u3u2
{
struct
{
uint x : 3;
uint y : 3;
uint z : 2;
} data;
uint8 pack;
};
union u4u4
{
struct
{
uint x : 4;
uint y : 4;
} data;
uint8 pack;
};
union u4u4u4u4
{
struct
{
uint x : 4;
uint y : 4;
uint z : 4;
uint w : 4;
} data;
uint16 pack;
};
union u5u6u5
{
struct
{
uint x : 5;
uint y : 6;
uint z : 5;
} data;
uint16 pack;
};
union u5u5u5u1
{
struct
{
uint x : 5;
uint y : 5;
uint z : 5;
uint w : 1;
} data;
uint16 pack;
};
union u10u10u10u2
{
struct
{
uint x : 10;
uint y : 10;
uint z : 10;
uint w : 2;
} data;
uint32 pack;
};
union i10i10i10i2
{
struct
{
int x : 10;
int y : 10;
int z : 10;
int w : 2;
} data;
uint32 pack;
};
union u9u9u9e5
{
struct
{
uint x : 9;
uint y : 9;
uint z : 9;
uint w : 5;
} data;
uint32 pack;
};
template <precision P, template <typename, precision> class vecType>
struct compute_half
{};
template <precision P>
struct compute_half<P, tvec1>
{
GLM_FUNC_QUALIFIER static tvec1<uint16, P> pack(tvec1<float, P> const & v)
{
int16 const Unpack(detail::toFloat16(v.x));
u16vec1 Packed(uninitialize);
memcpy(&Packed, &Unpack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER static tvec1<float, P> unpack(tvec1<uint16, P> const & v)
{
i16vec1 Unpack(uninitialize);
memcpy(&Unpack, &v, sizeof(Unpack));
return tvec1<float, P>(detail::toFloat32(v.x));
}
};
template <precision P>
struct compute_half<P, tvec2>
{
GLM_FUNC_QUALIFIER static tvec2<uint16, P> pack(tvec2<float, P> const & v)
{
tvec2<int16, P> const Unpack(detail::toFloat16(v.x), detail::toFloat16(v.y));
u16vec2 Packed(uninitialize);
memcpy(&Packed, &Unpack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER static tvec2<float, P> unpack(tvec2<uint16, P> const & v)
{
i16vec2 Unpack(uninitialize);
memcpy(&Unpack, &v, sizeof(Unpack));
return tvec2<float, P>(detail::toFloat32(v.x), detail::toFloat32(v.y));
}
};
template <precision P>
struct compute_half<P, tvec3>
{
GLM_FUNC_QUALIFIER static tvec3<uint16, P> pack(tvec3<float, P> const & v)
{
tvec3<int16, P> const Unpack(detail::toFloat16(v.x), detail::toFloat16(v.y), detail::toFloat16(v.z));
u16vec3 Packed(uninitialize);
memcpy(&Packed, &Unpack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER static tvec3<float, P> unpack(tvec3<uint16, P> const & v)
{
i16vec3 Unpack(uninitialize);
memcpy(&Unpack, &v, sizeof(Unpack));
return tvec3<float, P>(detail::toFloat32(v.x), detail::toFloat32(v.y), detail::toFloat32(v.z));
}
};
template <precision P>
struct compute_half<P, tvec4>
{
GLM_FUNC_QUALIFIER static tvec4<uint16, P> pack(tvec4<float, P> const & v)
{
tvec4<int16, P> const Unpack(detail::toFloat16(v.x), detail::toFloat16(v.y), detail::toFloat16(v.z), detail::toFloat16(v.w));
u16vec4 Packed(uninitialize);
memcpy(&Packed, &Unpack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER static tvec4<float, P> unpack(tvec4<uint16, P> const & v)
{
i16vec4 Unpack(uninitialize);
memcpy(&Unpack, &v, sizeof(Unpack));
return tvec4<float, P>(detail::toFloat32(v.x), detail::toFloat32(v.y), detail::toFloat32(v.z), detail::toFloat32(v.w));
}
};
}//namespace detail
GLM_FUNC_QUALIFIER uint8 packUnorm1x8(float v)
{
return static_cast<uint8>(round(clamp(v, 0.0f, 1.0f) * 255.0f));
}
GLM_FUNC_QUALIFIER float unpackUnorm1x8(uint8 p)
{
float const Unpack(p);
return Unpack * static_cast<float>(0.0039215686274509803921568627451); // 1 / 255
}
GLM_FUNC_QUALIFIER uint16 packUnorm2x8(vec2 const & v)
{
u8vec2 const Topack(round(clamp(v, 0.0f, 1.0f) * 255.0f));
uint16 Unpack = 0;
memcpy(&Unpack, &Topack, sizeof(Unpack));
return Unpack;
}
GLM_FUNC_QUALIFIER vec2 unpackUnorm2x8(uint16 p)
{
u8vec2 Unpack(uninitialize);
memcpy(&Unpack, &p, sizeof(Unpack));
return vec2(Unpack) * float(0.0039215686274509803921568627451); // 1 / 255
}
GLM_FUNC_QUALIFIER uint8 packSnorm1x8(float v)
{
int8 const Topack(static_cast<int8>(round(clamp(v ,-1.0f, 1.0f) * 127.0f)));
uint8 Packed = 0;
memcpy(&Packed, &Topack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER float unpackSnorm1x8(uint8 p)
{
int8 Unpack = 0;
memcpy(&Unpack, &p, sizeof(Unpack));
return clamp(
static_cast<float>(Unpack) * 0.00787401574803149606299212598425f, // 1.0f / 127.0f
-1.0f, 1.0f);
}
GLM_FUNC_QUALIFIER uint16 packSnorm2x8(vec2 const & v)
{
i8vec2 const Topack(round(clamp(v, -1.0f, 1.0f) * 127.0f));
uint16 Packed = 0;
memcpy(&Packed, &Topack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER vec2 unpackSnorm2x8(uint16 p)
{
i8vec2 Unpack(uninitialize);
memcpy(&Unpack, &p, sizeof(Unpack));
return clamp(
vec2(Unpack) * 0.00787401574803149606299212598425f, // 1.0f / 127.0f
-1.0f, 1.0f);
}
GLM_FUNC_QUALIFIER uint16 packUnorm1x16(float s)
{
return static_cast<uint16>(round(clamp(s, 0.0f, 1.0f) * 65535.0f));
}
GLM_FUNC_QUALIFIER float unpackUnorm1x16(uint16 p)
{
float const Unpack(p);
return Unpack * 1.5259021896696421759365224689097e-5f; // 1.0 / 65535.0
}
GLM_FUNC_QUALIFIER uint64 packUnorm4x16(vec4 const & v)
{
u16vec4 const Topack(round(clamp(v , 0.0f, 1.0f) * 65535.0f));
uint64 Packed = 0;
memcpy(&Packed, &Topack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER vec4 unpackUnorm4x16(uint64 p)
{
u16vec4 Unpack(uninitialize);
memcpy(&Unpack, &p, sizeof(Unpack));
return vec4(Unpack) * 1.5259021896696421759365224689097e-5f; // 1.0 / 65535.0
}
GLM_FUNC_QUALIFIER uint16 packSnorm1x16(float v)
{
int16 const Topack = static_cast<int16>(round(clamp(v ,-1.0f, 1.0f) * 32767.0f));
uint16 Packed = 0;
memcpy(&Packed, &Topack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER float unpackSnorm1x16(uint16 p)
{
int16 Unpack = 0;
memcpy(&Unpack, &p, sizeof(Unpack));
return clamp(
static_cast<float>(Unpack) * 3.0518509475997192297128208258309e-5f, //1.0f / 32767.0f,
-1.0f, 1.0f);
}
GLM_FUNC_QUALIFIER uint64 packSnorm4x16(vec4 const & v)
{
i16vec4 const Topack(round(clamp(v ,-1.0f, 1.0f) * 32767.0f));
uint64 Packed = 0;
memcpy(&Packed, &Topack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER vec4 unpackSnorm4x16(uint64 p)
{
i16vec4 Unpack(uninitialize);
memcpy(&Unpack, &p, sizeof(Unpack));
return clamp(
vec4(Unpack) * 3.0518509475997192297128208258309e-5f, //1.0f / 32767.0f,
-1.0f, 1.0f);
}
GLM_FUNC_QUALIFIER uint16 packHalf1x16(float v)
{
int16 const Topack(detail::toFloat16(v));
uint16 Packed = 0;
memcpy(&Packed, &Topack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER float unpackHalf1x16(uint16 v)
{
int16 Unpack = 0;
memcpy(&Unpack, &v, sizeof(Unpack));
return detail::toFloat32(Unpack);
}
GLM_FUNC_QUALIFIER uint64 packHalf4x16(glm::vec4 const & v)
{
i16vec4 const Unpack(
detail::toFloat16(v.x),
detail::toFloat16(v.y),
detail::toFloat16(v.z),
detail::toFloat16(v.w));
uint64 Packed = 0;
memcpy(&Packed, &Unpack, sizeof(Packed));
return Packed;
}
GLM_FUNC_QUALIFIER glm::vec4 unpackHalf4x16(uint64 v)
{
i16vec4 Unpack(uninitialize);
memcpy(&Unpack, &v, sizeof(Unpack));
return vec4(
detail::toFloat32(Unpack.x),
detail::toFloat32(Unpack.y),
detail::toFloat32(Unpack.z),
detail::toFloat32(Unpack.w));
}
GLM_FUNC_QUALIFIER uint32 packI3x10_1x2(ivec4 const & v)
{
detail::i10i10i10i2 Result;
Result.data.x = v.x;
Result.data.y = v.y;
Result.data.z = v.z;
Result.data.w = v.w;
return Result.pack;
}
GLM_FUNC_QUALIFIER ivec4 unpackI3x10_1x2(uint32 v)
{
detail::i10i10i10i2 Unpack;
Unpack.pack = v;
return ivec4(
Unpack.data.x,
Unpack.data.y,
Unpack.data.z,
Unpack.data.w);
}
GLM_FUNC_QUALIFIER uint32 packU3x10_1x2(uvec4 const & v)
{
detail::u10u10u10u2 Result;
Result.data.x = v.x;
Result.data.y = v.y;
Result.data.z = v.z;
Result.data.w = v.w;
return Result.pack;
}
GLM_FUNC_QUALIFIER uvec4 unpackU3x10_1x2(uint32 v)
{
detail::u10u10u10u2 Unpack;
Unpack.pack = v;
return uvec4(
Unpack.data.x,
Unpack.data.y,
Unpack.data.z,
Unpack.data.w);
}
GLM_FUNC_QUALIFIER uint32 packSnorm3x10_1x2(vec4 const & v)
{
detail::i10i10i10i2 Result;
Result.data.x = int(round(clamp(v.x,-1.0f, 1.0f) * 511.f));
Result.data.y = int(round(clamp(v.y,-1.0f, 1.0f) * 511.f));
Result.data.z = int(round(clamp(v.z,-1.0f, 1.0f) * 511.f));
Result.data.w = int(round(clamp(v.w,-1.0f, 1.0f) * 1.f));
return Result.pack;
}
GLM_FUNC_QUALIFIER vec4 unpackSnorm3x10_1x2(uint32 v)
{
detail::i10i10i10i2 Unpack;
Unpack.pack = v;
vec4 Result;
Result.x = clamp(float(Unpack.data.x) / 511.f, -1.0f, 1.0f);
Result.y = clamp(float(Unpack.data.y) / 511.f, -1.0f, 1.0f);
Result.z = clamp(float(Unpack.data.z) / 511.f, -1.0f, 1.0f);
Result.w = clamp(float(Unpack.data.w) / 1.f, -1.0f, 1.0f);
return Result;
}
GLM_FUNC_QUALIFIER uint32 packUnorm3x10_1x2(vec4 const & v)
{
uvec4 const Unpack(round(clamp(v, 0.0f, 1.0f) * vec4(1023.f, 1023.f, 1023.f, 3.f)));
detail::u10u10u10u2 Result;
Result.data.x = Unpack.x;
Result.data.y = Unpack.y;
Result.data.z = Unpack.z;
Result.data.w = Unpack.w;
return Result.pack;
}
GLM_FUNC_QUALIFIER vec4 unpackUnorm3x10_1x2(uint32 v)
{
vec4 const ScaleFactors(1.0f / 1023.f, 1.0f / 1023.f, 1.0f / 1023.f, 1.0f / 3.f);
detail::u10u10u10u2 Unpack;
Unpack.pack = v;
return vec4(Unpack.data.x, Unpack.data.y, Unpack.data.z, Unpack.data.w) * ScaleFactors;
}
GLM_FUNC_QUALIFIER uint32 packF2x11_1x10(vec3 const & v)
{
return
((detail::floatTo11bit(v.x) & ((1 << 11) - 1)) << 0) |
((detail::floatTo11bit(v.y) & ((1 << 11) - 1)) << 11) |
((detail::floatTo10bit(v.z) & ((1 << 10) - 1)) << 22);
}
GLM_FUNC_QUALIFIER vec3 unpackF2x11_1x10(uint32 v)
{
return vec3(
detail::packed11bitToFloat(v >> 0),
detail::packed11bitToFloat(v >> 11),
detail::packed10bitToFloat(v >> 22));
}
GLM_FUNC_QUALIFIER uint32 packF3x9_E1x5(vec3 const & v)
{
float const SharedExpMax = (pow(2.0f, 9.0f - 1.0f) / pow(2.0f, 9.0f)) * pow(2.0f, 31.f - 15.f);
vec3 const Color = clamp(v, 0.0f, SharedExpMax);
float const MaxColor = max(Color.x, max(Color.y, Color.z));
float const ExpSharedP = max(-15.f - 1.f, floor(log2(MaxColor))) + 1.0f + 15.f;
float const MaxShared = floor(MaxColor / pow(2.0f, (ExpSharedP - 15.f - 9.f)) + 0.5f);
float const ExpShared = MaxShared == pow(2.0f, 9.0f) ? ExpSharedP + 1.0f : ExpSharedP;
uvec3 const ColorComp(floor(Color / pow(2.f, (ExpShared - 15.f - 9.f)) + 0.5f));
detail::u9u9u9e5 Unpack;
Unpack.data.x = ColorComp.x;
Unpack.data.y = ColorComp.y;
Unpack.data.z = ColorComp.z;
Unpack.data.w = uint(ExpShared);
return Unpack.pack;
}
GLM_FUNC_QUALIFIER vec3 unpackF3x9_E1x5(uint32 v)
{
detail::u9u9u9e5 Unpack;
Unpack.pack = v;
return vec3(Unpack.data.x, Unpack.data.y, Unpack.data.z) * pow(2.0f, Unpack.data.w - 15.f - 9.f);
}
template <precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<uint16, P> packHalf(vecType<float, P> const & v)
{
return detail::compute_half<P, vecType>::pack(v);
}
template <precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<float, P> unpackHalf(vecType<uint16, P> const & v)
{
return detail::compute_half<P, vecType>::unpack(v);
}
template <typename uintType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<uintType, P> packUnorm(vecType<floatType, P> const & v)
{
GLM_STATIC_ASSERT(std::numeric_limits<uintType>::is_integer, "uintType must be an integer type");
GLM_STATIC_ASSERT(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return vecType<uintType, P>(round(clamp(v, static_cast<floatType>(0), static_cast<floatType>(1)) * static_cast<floatType>(std::numeric_limits<uintType>::max())));
}
template <typename uintType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<floatType, P> unpackUnorm(vecType<uintType, P> const & v)
{
GLM_STATIC_ASSERT(std::numeric_limits<uintType>::is_integer, "uintType must be an integer type");
GLM_STATIC_ASSERT(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return vecType<float, P>(v) * (static_cast<floatType>(1) / static_cast<floatType>(std::numeric_limits<uintType>::max()));
}
template <typename intType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<intType, P> packSnorm(vecType<floatType, P> const & v)
{
GLM_STATIC_ASSERT(std::numeric_limits<intType>::is_integer, "uintType must be an integer type");
GLM_STATIC_ASSERT(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return vecType<intType, P>(round(clamp(v , static_cast<floatType>(-1), static_cast<floatType>(1)) * static_cast<floatType>(std::numeric_limits<intType>::max())));
}
template <typename intType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<floatType, P> unpackSnorm(vecType<intType, P> const & v)
{
GLM_STATIC_ASSERT(std::numeric_limits<intType>::is_integer, "uintType must be an integer type");
GLM_STATIC_ASSERT(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return clamp(vecType<floatType, P>(v) * (static_cast<floatType>(1) / static_cast<floatType>(std::numeric_limits<intType>::max())), static_cast<floatType>(-1), static_cast<floatType>(1));
}
GLM_FUNC_QUALIFIER uint8 packUnorm2x4(vec2 const & v)
{
u32vec2 const Unpack(round(clamp(v, 0.0f, 1.0f) * 15.0f));
detail::u4u4 Result;
Result.data.x = Unpack.x;
Result.data.y = Unpack.y;
return Result.pack;
}
GLM_FUNC_QUALIFIER vec2 unpackUnorm2x4(uint8 v)
{
float const ScaleFactor(1.f / 15.f);
detail::u4u4 Unpack;
Unpack.pack = v;
return vec2(Unpack.data.x, Unpack.data.y) * ScaleFactor;
}
GLM_FUNC_QUALIFIER uint16 packUnorm4x4(vec4 const & v)
{
u32vec4 const Unpack(round(clamp(v, 0.0f, 1.0f) * 15.0f));
detail::u4u4u4u4 Result;
Result.data.x = Unpack.x;
Result.data.y = Unpack.y;
Result.data.z = Unpack.z;
Result.data.w = Unpack.w;
return Result.pack;
}
GLM_FUNC_QUALIFIER vec4 unpackUnorm4x4(uint16 v)
{
float const ScaleFactor(1.f / 15.f);
detail::u4u4u4u4 Unpack;
Unpack.pack = v;
return vec4(Unpack.data.x, Unpack.data.y, Unpack.data.z, Unpack.data.w) * ScaleFactor;
}
GLM_FUNC_QUALIFIER uint16 packUnorm1x5_1x6_1x5(vec3 const & v)
{
u32vec3 const Unpack(round(clamp(v, 0.0f, 1.0f) * vec3(31.f, 63.f, 31.f)));
detail::u5u6u5 Result;
Result.data.x = Unpack.x;
Result.data.y = Unpack.y;
Result.data.z = Unpack.z;
return Result.pack;
}
GLM_FUNC_QUALIFIER vec3 unpackUnorm1x5_1x6_1x5(uint16 v)
{
vec3 const ScaleFactor(1.f / 31.f, 1.f / 63.f, 1.f / 31.f);
detail::u5u6u5 Unpack;
Unpack.pack = v;
return vec3(Unpack.data.x, Unpack.data.y, Unpack.data.z) * ScaleFactor;
}
GLM_FUNC_QUALIFIER uint16 packUnorm3x5_1x1(vec4 const & v)
{
u32vec4 const Unpack(round(clamp(v, 0.0f, 1.0f) * vec4(31.f, 31.f, 31.f, 1.f)));
detail::u5u5u5u1 Result;
Result.data.x = Unpack.x;
Result.data.y = Unpack.y;
Result.data.z = Unpack.z;
Result.data.w = Unpack.w;
return Result.pack;
}
GLM_FUNC_QUALIFIER vec4 unpackUnorm3x5_1x1(uint16 v)
{
vec4 const ScaleFactor(1.f / 31.f, 1.f / 31.f, 1.f / 31.f, 1.f);
detail::u5u5u5u1 Unpack;
Unpack.pack = v;
return vec4(Unpack.data.x, Unpack.data.y, Unpack.data.z, Unpack.data.w) * ScaleFactor;
}
GLM_FUNC_QUALIFIER uint8 packUnorm2x3_1x2(vec3 const & v)
{
u32vec3 const Unpack(round(clamp(v, 0.0f, 1.0f) * vec3(7.f, 7.f, 3.f)));
detail::u3u3u2 Result;
Result.data.x = Unpack.x;
Result.data.y = Unpack.y;
Result.data.z = Unpack.z;
return Result.pack;
}
GLM_FUNC_QUALIFIER vec3 unpackUnorm2x3_1x2(uint8 v)
{
vec3 const ScaleFactor(1.f / 7.f, 1.f / 7.f, 1.f / 3.f);
detail::u3u3u2 Unpack;
Unpack.pack = v;
return vec3(Unpack.data.x, Unpack.data.y, Unpack.data.z) * ScaleFactor;
}
}//namespace glm