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util: Use u_half to perform half <--> float conversions.

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This commit is contained in:
Michal Krol 2010-04-01 09:52:40 +02:00
parent 5a359df219
commit b7bca4b28c
1 changed files with 6 additions and 47 deletions
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53
src/gallium/auxiliary/util/u_format_pack.py
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@ -43,45 +43,6 @@ import math
from u_format_parse import *
def generate_f16_to_f32():
'''Naive implementation, need something faster that operates on bits'''
print '''
static float
f16_to_f32(uint16_t h)
{
unsigned mantissa = h & 0x3ff;
unsigned exponent = (h >> 10) & 0x1f;
float sign = (h & 0x8000) ? -1.0f : 1.0f;
if (exponent == 0) {
if (mantissa == 0) {
return sign * 0.0f;
}
return sign * powf(2.0f, -14.0f) * (float)mantissa / 1024.0f;
}
if (exponent == 31) {
if (mantissa == 0) {
/* XXX: infinity */
return sign * 100000.0f;
}
/* XXX: NaN */
return 1000.0f;
}
return sign * powf(2.0f, (float)exponent - 15.0f) * (1.0f + (float)mantissa / 1024.0f);
}
'''
def generate_f32_to_f16():
print '''
static uint16_t
f32_to_f16(float f)
{
/* TODO */
return 0;
}
'''
def generate_format_type(format):
'''Generate a structure that describes the format.'''
@ -271,18 +232,18 @@ def conversion_expr(src_channel, dst_channel, dst_native_type, value, clamp=True
return value
if src_channel.type == FLOAT and dst_channel.type == FLOAT:
if src_channel.size == dst_channel.size:
return value
if src_channel.size == 64:
value = '(float)%s' % (value)
elif src_channel.size == 16:
value = 'f16_to_f32(%s)' % (value)
value = 'util_half_to_float(%s)' % (value)
if dst_channel.size == 16:
value = 'f32_to_f16(%s)' % (value)
value = 'util_float_to_half(%s)' % (value)
elif dst_channel.size == 64:
value = '(double)%s' % (value)
return value
if clamp:
value = clamp_expr(src_channel, dst_channel, dst_native_type, value)
@ -584,11 +545,9 @@ def generate(formats):
print '#include "pipe/p_compiler.h"'
print '#include "u_math.h"'
print '#include "u_format.h"'
print '#include "u_half.h"'
print
generate_f16_to_f32()
generate_f32_to_f16()
for format in formats:
if is_format_supported(format):
generate_format_type(format)