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Merge branch 'fix-type-punning' of https://github.com/cneumann/glm into union

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This commit is contained in:
Christophe Riccio 2015-07-19 01:08:04 +02:00
commit 6887df4d39
1 changed files with 132 additions and 30 deletions
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162
glm/detail/func_packing.inl
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@ -38,82 +38,184 @@ namespace glm
{
GLM_FUNC_QUALIFIER uint packUnorm2x16(vec2 const & v)
{
u16vec2 const Topack(round(clamp(v, 0.0f, 1.0f) * 65535.0f));
return reinterpret_cast<uint const &>(Topack);
union
{
u16 in[2];
uint out;
} u;
u.in[0] = round(clamp(v[0], 0.0f, 1.0f) * 65535.0f);
u.in[1] = round(clamp(v[1], 0.0f, 1.0f) * 65535.0f);
return u.out;
}
GLM_FUNC_QUALIFIER vec2 unpackUnorm2x16(uint p)
{
vec2 Unpack(reinterpret_cast<u16vec2 const &>(p));
return Unpack * float(1.5259021896696421759365224689097e-5); // 1.0 / 65535.0
union
{
uint in;
u16 out[2];
} u;
u.in = p;
return vec2(
u.out[0] * 1.5259021896696421759365224689097e-5f,
u.out[1] * 1.5259021896696421759365224689097e-5f);
}
GLM_FUNC_QUALIFIER uint packSnorm2x16(vec2 const & v)
{
i16vec2 const Topack(round(clamp(v ,-1.0f, 1.0f) * 32767.0f));
return reinterpret_cast<uint const &>(Topack);
union
{
i16 in[2];
uint out;
} u;
u.in[0] = round(clamp(v[0], -1.0f, 1.0f) * 32767.0f);
u.in[1] = round(clamp(v[1], -1.0f, 1.0f) * 32767.0f);
return u.out;
}
GLM_FUNC_QUALIFIER vec2 unpackSnorm2x16(uint p)
{
vec2 const Unpack(reinterpret_cast<i16vec2 const &>(p));
return clamp(
Unpack * 3.0518509475997192297128208258309e-5f, //1.0f / 32767.0f,
-1.0f, 1.0f);
union
{
uint in;
i16 out[2];
} u;
u.in = p;
return vec2(
clamp(u.out[0] * 3.0518509475997192297128208258309e-5f,
-1.0f, 1.0f),
clamp(u.out[1] * 3.0518509475997192297128208258309e-5f,
-1.0f, 1.0f));
}
GLM_FUNC_QUALIFIER uint packUnorm4x8(vec4 const & v)
{
u8vec4 const Topack(round(clamp(v, 0.0f, 1.0f) * 255.0f));
return reinterpret_cast<uint const &>(Topack);
union
{
u8 in[4];
uint out;
} u;
u.in[0] = round(clamp(v[0], 0.0f, 1.0f) * 255.0f);
u.in[1] = round(clamp(v[1], 0.0f, 1.0f) * 255.0f);
u.in[2] = round(clamp(v[2], 0.0f, 1.0f) * 255.0f);
u.in[3] = round(clamp(v[3], 0.0f, 1.0f) * 255.0f);
return u.out;
}
GLM_FUNC_QUALIFIER vec4 unpackUnorm4x8(uint p)
{
vec4 const Unpack(reinterpret_cast<u8vec4 const&>(p));
return Unpack * float(0.0039215686274509803921568627451); // 1 / 255
union
{
uint in;
u8 out[4];
} u;
u.in = p;
return vec4(
u.out[0] * 0.0039215686274509803921568627451f,
u.out[1] * 0.0039215686274509803921568627451f,
u.out[2] * 0.0039215686274509803921568627451f,
u.out[3] * 0.0039215686274509803921568627451f);
}
GLM_FUNC_QUALIFIER uint packSnorm4x8(vec4 const & v)
{
i8vec4 const Topack(round(clamp(v ,-1.0f, 1.0f) * 127.0f));
return reinterpret_cast<uint const &>(Topack);
union
{
i8 in[4];
uint out;
} u;
u.in[0] = round(clamp(v[0], -1.0f, 1.0f) * 127.0f);
u.in[1] = round(clamp(v[1], -1.0f, 1.0f) * 127.0f);
u.in[2] = round(clamp(v[2], -1.0f, 1.0f) * 127.0f);
u.in[3] = round(clamp(v[3], -1.0f, 1.0f) * 127.0f);
return u.out;
}
GLM_FUNC_QUALIFIER glm::vec4 unpackSnorm4x8(uint p)
{
vec4 const Unpack(reinterpret_cast<i8vec4 const &>(p));
return clamp(
Unpack * 0.0078740157480315f, // 1.0f / 127.0f
-1.0f, 1.0f);
union
{
uint in;
i8 out[4];
} u;
u.in = p;
return vec4(
clamp(u.out[0] * 0.0078740157480315f, -1.0f, 1.0f),
clamp(u.out[1] * 0.0078740157480315f, -1.0f, 1.0f),
clamp(u.out[2] * 0.0078740157480315f, -1.0f, 1.0f),
clamp(u.out[3] * 0.0078740157480315f, -1.0f, 1.0f));
}
GLM_FUNC_QUALIFIER double packDouble2x32(uvec2 const & v)
{
return reinterpret_cast<double const &>(v);
union
{
uint in[2];
double out;
} u;
u.in[0] = v[0];
u.in[1] = v[1];
return u.out;
}
GLM_FUNC_QUALIFIER uvec2 unpackDouble2x32(double v)
{
return reinterpret_cast<uvec2 const &>(v);
union
{
double in;
uint out[2];
} u;
u.in = v;
return uvec2(u.out[0], u.out[1]);
}
GLM_FUNC_QUALIFIER uint packHalf2x16(vec2 const & v)
{
i16vec2 const Unpack(
detail::toFloat16(v.x),
detail::toFloat16(v.y));
union
{
i16 in[2];
uint out;
} u;
return reinterpret_cast<uint const &>(Unpack);
u.in[0] = detail::toFloat16(v.x);
u.in[1] = detail::toFloat16(v.y);
return u.out;
}
GLM_FUNC_QUALIFIER vec2 unpackHalf2x16(uint v)
{
i16vec2 const Unpack(reinterpret_cast<i16vec2 const &>(v));
union
{
uint in;
i16 out[2];
} u;
u.in = v;
return vec2(
detail::toFloat32(Unpack.x),
detail::toFloat32(Unpack.y));
detail::toFloat32(u.out[0]),
detail::toFloat32(u.out[1]));
}
}//namespace glm