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util: Generate linear<->sRGB conversion tables.

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This commit is contained in:
Michal Krol 2010-03-01 19:00:40 +01:00
parent ac8e1c18f2
commit c863f30155
1 changed files with 17 additions and 0 deletions
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17
src/gallium/auxiliary/util/u_format_access.py
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@ -37,6 +37,7 @@
'''
import math
import sys
from u_format_pack import *
@ -94,6 +95,20 @@ def native_type(format):
assert False
def generate_srgb_tables():
print 'static ubyte srgb_to_linear[256] = {'
for i in range(256):
print ' %s,' % (int(math.pow((i / 255.0 + 0.055) / 1.055, 2.4) * 255))
print '};'
print
print 'static ubyte linear_to_srgb[256] = {'
print ' 0,'
for i in range(1, 256):
print ' %s,' % (int((1.055 * math.pow(i / 255.0, 0.41666) - 0.055) * 255))
print '};'
print
def generate_format_read(format, dst_channel, dst_native_type, dst_suffix):
'''Generate the function to read pixels from a particular format'''
@ -305,6 +320,8 @@ def main():
print '#include "u_format_pack.h"'
print
generate_srgb_tables()
type = Channel(FLOAT, False, 32)
native_type = 'float'
suffix = '4f'