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Optimize linear<->sRGB conversion for SSE2 processors

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Using SSE2 intrinsics when available for this kind of conversions.

It's not totally accurate, but accurate enough for the purposes where
we're using direct colorspace conversion by-passing OCIO.

Partially based on code from Cycles, partially based on other online
articles:

  https://stackoverflow.com/questions/6475373/optimizations-for-pow-with-const-non-integer-exponent

Makes projection painting on hi-res float textures smoother.

This commit also enables global SSE2 in Blender. It shouldn't
bring any regressions in supported hardware (we require SSE2 since
2.64 now), but should keep an eye on because compilers might have
some bugs with that (unlikely, but possible).
This commit is contained in:
Sergey Sharybin
2016-05-05 19:25:08 +02:00
parent bb6fbc64ae
commit 88b72925d0
4 changed files with 171 additions and 22 deletions
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22
CMakeLists.txt
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@@ -2357,17 +2357,17 @@ endif()
# See TEST_SSE_SUPPORT() for how this is defined.
if(WITH_RAYOPTIMIZATION)
if(SUPPORT_SSE_BUILD)
set(PLATFORM_CFLAGS " ${COMPILER_SSE_FLAG} ${PLATFORM_CFLAGS}")
add_definitions(-D__SSE__ -D__MMX__)
endif()
if(SUPPORT_SSE2_BUILD)
set(PLATFORM_CFLAGS " ${COMPILER_SSE2_FLAG} ${PLATFORM_CFLAGS}")
add_definitions(-D__SSE2__)
if(NOT SUPPORT_SSE_BUILD) # dont double up
add_definitions(-D__MMX__)
endif()
# Do it globally, SSE2 is required for quite some time now.
# Doing it now allows to use SSE/SSE2 in inline headers.
if(SUPPORT_SSE_BUILD)
set(PLATFORM_CFLAGS " ${COMPILER_SSE_FLAG} ${PLATFORM_CFLAGS}")
add_definitions(-D__SSE__ -D__MMX__)
endif()
if(SUPPORT_SSE2_BUILD)
set(PLATFORM_CFLAGS " ${COMPILER_SSE2_FLAG} ${PLATFORM_CFLAGS}")
add_definitions(-D__SSE2__)
if(NOT SUPPORT_SSE_BUILD) # dont double up
add_definitions(-D__MMX__)
endif()
endif()