okseby/Quake-III-Arena
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

OpenGL2: Support half floats for texcoords and vertex colors.

Browse source
This commit is contained in:
SmileTheory 2014-11-03 19:10:35 -08:00
parent 1ba9e7a45e
commit 943259f6b4
10 changed files with 193 additions and 154 deletions
Download patch file Download diff file Expand all files Collapse all files

59
code/renderergl2/tr_extramath.c
View file

@ -199,42 +199,35 @@ int NextPowerOfTwo(int in)
return out;
}
unsigned short FloatToHalf(float in)
{
unsigned short out;
union
{
float f;
unsigned int i;
} f32;
union f32_u {
float f;
uint32_t i;
struct {
unsigned int fraction:23;
unsigned int exponent:8;
unsigned int sign:1;
} pack;
};
int sign, inExponent, inFraction;
int outExponent, outFraction;
union f16_u {
uint16_t i;
struct {
unsigned int fraction:10;
unsigned int exponent:5;
unsigned int sign:1;
} pack;
};
uint16_t FloatToHalf(float in)
{
union f32_u f32;
union f16_u f16;
f32.f = in;
sign = (f32.i & 0x80000000) >> 31;
inExponent = (f32.i & 0x7F800000) >> 23;
inFraction = f32.i & 0x007FFFFF;
f16.pack.exponent = CLAMP(f32.pack.exponent - 112, 0, 31);
f16.pack.fraction = f32.pack.fraction >> 13;
f16.pack.sign = f32.pack.sign;
outExponent = CLAMP(inExponent - 127, -15, 16) + 15;
outFraction = 0;
if (outExponent == 0x1F)
{
if (inExponent == 0xFF && inFraction != 0)
outFraction = 0x3FF;
}
else if (outExponent == 0x00)
{
if (inExponent == 0x00 && inFraction != 0)
outFraction = 0x3FF;
}
else
outFraction = inFraction >> 13;
out = (sign << 15) | (outExponent << 10) | outFraction;
return out;
return f16.i;
}