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LOG2() clean-up (Klaus Niederkrueger)

This commit is contained in:
Brian Paul 2003-04-28 15:24:17 +00:00
parent c8f2f456f9
commit 9e3a7cd6dd
1 changed files with 8 additions and 8 deletions
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16
src/mesa/main/imports.h
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@ -198,14 +198,14 @@ static INLINE GLfloat LOG2(GLfloat x)
*/
static INLINE GLfloat LOG2(GLfloat val)
{
GLint *exp_ptr = (GLint *) &val;
GLint x = *exp_ptr;
const GLint log_2 = ((x >> 23) & 255) - 128;
x &= ~(255 << 23);
x += 127 << 23;
*exp_ptr = x;
val = ((-1.0f/3) * val + 2) * val - 2.0f/3;
return val + log_2;
fi_type num;
GLint log_2;
num.f = val;
log_2 = ((num.i >> 23) & 255) - 128;
num.i &= ~(255 << 23);
num.i += 127 << 23;
num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;
return num.f + log_2;
}
#elif defined(XFree86LOADER) && defined(IN_MODULE)
#define LOG2(x) ((GLfloat) (xf86log(x) * 1.442695))