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Added f11f11f10 conversion code

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This commit is contained in:
Christophe Riccio 2013-08-09 21:15:08 +02:00
parent 493b36cf15
commit 97f43994cd
1 changed files with 232 additions and 0 deletions
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232
test/gtc/gtc_half_float.cpp
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@ -29,6 +29,7 @@
#include <glm/glm.hpp>
#include <glm/gtc/half_float.hpp>
#include <cstdio>
int test_half_precision_scalar()
{
@ -585,10 +586,241 @@ static int test_hmat_precision()
return Error;
}
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
class f11f11f10
{
public:
f11f11f10(float x, float y, float z) :
x(detail::floatTo11bit(x)),
y(detail::floatTo11bit(y)),
z(detail::floatTo10bit(z))
{}
/*
operator glm::vec3()
{
return glm::vec3(
float(x) / 511.0f,
float(y) / 511.0f,
float(z) / 511.0f);
}
*/
private:
int x : 11;
int y : 11;
int z : 10;
};
void print_bits(glm::half const & s)
{
union
{
glm::detail::hdata h;
unsigned short i;
} uif;
uif.h = s._data();
printf("f16: ");
for(std::size_t j = sizeof(s) * 8; j > 0; --j)
{
if(j == 10 || j == 15)
printf(" ");
printf("%d", (uif.i & (1 << (j - 1))) ? 1 : 0);
}
}
void print_bits(float const & s)
{
union
{
float f;
unsigned int i;
} uif;
uif.f = s;
printf("f32: ");
for(std::size_t j = sizeof(s) * 8; j > 0; --j)
{
if(j == 23 || j == 31)
printf(" ");
printf("%d", (uif.i & (1 << (j - 1))) ? 1 : 0);
}
}
void print_10bits(glm::uint const & s)
{
printf("10b: ");
for(std::size_t j = 10; j > 0; --j)
{
if(j == 5)
printf(" ");
printf("%d", (s & (1 << (j - 1))) ? 1 : 0);
}
}
void print_11bits(glm::uint const & s)
{
printf("11b: ");
for(std::size_t j = 11; j > 0; --j)
{
if(j == 6)
printf(" ");
printf("%d", (s & (1 << (j - 1))) ? 1 : 0);
}
}
void print_value(float const & s)
{
printf("%2.5f, ", s);
print_bits(s);
printf(", ");
print_bits(glm::half(s));
printf(", ");
print_11bits(detail::floatTo11bit(s));
printf(", ");
print_10bits(detail::floatTo10bit(s));
printf("\n");
}
int test_half()
{
int Error = 0;
print_value(0.0);
print_value(0.1);
print_value(0.2);
print_value(0.3);
print_value(0.4);
print_value(0.5);
print_value(0.6);
print_value(1.0);
print_value(1.1);
print_value(1.2);
print_value(1.3);
print_value(1.4);
print_value(1.5);
print_value(1.6);
print_value(2.0);
print_value(2.1);
print_value(2.2);
print_value(2.3);
print_value(2.4);
print_value(2.5);
print_value(2.6);
return Error;
}
int main()
{
int Error = 0;
Error += test_half();
Error += test_hvec_precision();
Error += test_hvec2_size();
Error += test_hvec3_size();