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Added packF11F11F10 implementation

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This commit is contained in:
Christophe Riccio
2013-08-10 19:52:59 +02:00
parent e3e88f05a6
commit cf14790806
4 changed files with 261 additions and 2 deletions
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4
glm/gtc/packing.hpp
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@@ -100,8 +100,8 @@ namespace glm
GLM_FUNC_DECL uint32 packI3x10I1x2(ivec4 const & v);
GLM_FUNC_DECL ivec4 unpackI3x10I1x2(uint32 const & v);
GLM_FUNC_DECL uint32 packU3x10U1x2(uvec4 const & v);
GLM_FUNC_DECL uvec4 unpackU3x10U1x2(uint32 const & v);
GLM_FUNC_DECL uint32 packU10U10U10U2(uvec4 const & v);
GLM_FUNC_DECL uvec4 unpackU10U10U10U2(uint32 const & v);
GLM_FUNC_DECL uint32 packF11F11F10(vec3 const & v);
GLM_FUNC_DECL vec3 unpackF11F11F10(uint32 const & v);

116
glm/gtc/packing.inl
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@@ -28,5 +28,121 @@
namespace glm
{
namespace detail
{
glm::uint16 float2half(glm::uint32 const & 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::uint16 float2packed11(glm::uint32 const & 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::uint float2packed10(glm::uint const & 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::uint half2float(glm::uint const & h)
{
return ((h & 0x8000) << 16) | ((( h & 0x7c00) + 0x1C000) << 13) | ((h & 0x03FF) << 13);
}
union uif
{
glm::uint i;
float f;
};
glm::uint floatTo11bit(float x)
{
if(x == 0.0f)
return 0;
else if(glm::isnan(x))
return ~0;
else if(glm::isinf(x))
return 0x1f << 6;
uif Union;
Union.f = x;
return float2packed11(Union.i);
}
glm::uint floatTo10bit(float x)
{
if(x == 0.0f)
return 0;
else if(glm::isnan(x))
return ~0;
else if(glm::isinf(x))
return 0x1f << 5;
uif Union;
Union.f = x;
return float2packed10(Union.i);
}
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);
}
}//namespace detail
GLM_FUNC_QUALIFIER uint32 packF11F11F10(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 unpackF11F11F10(uint32 const & v)
{
}
}//namespace glm