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(svn r26255) -Codechange: improve performance of brightness adjustment (MJP)

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rubidium
2014-01-13 18:05:47 +00:00
parent 2f7c4f6d12
commit 70901e04c5
4 changed files with 21 additions and 22 deletions
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20
src/blitter/32bpp_sse2.cpp
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@@ -294,7 +294,7 @@ inline Colour Blitter_32bppSSE2::AdjustBrightness(Colour colour, uint8 brightnes
}
IGNORE_UNINITIALIZED_WARNING_START
/* static */ Colour Blitter_32bppSSE2::ReallyAdjustBrightness(Colour colour, uint8 brightness)
Colour Blitter_32bppSSE2::ReallyAdjustBrightness(Colour colour, uint8 brightness)
{
uint64 c16 = colour.b | (uint64) colour.g << 16 | (uint64) colour.r << 32;
c16 *= brightness;
@@ -304,24 +304,14 @@ IGNORE_UNINITIALIZED_WARNING_START
/* Sum overbright (maximum for each rgb is 508, 9 bits, -255 is changed in -256 so we just have to take the 8 lower bits into account). */
c16_ob = (((c16_ob >> (8 + 7)) & 0x0100010001) * 0xFF) & c16;
uint64 ob = (uint16) c16_ob + (uint16) (c16_ob >> 16) + (uint16) (c16_ob >> 32);
const uint ob = ((uint16) c16_ob + (uint16) (c16_ob >> 16) + (uint16) (c16_ob >> 32)) / 2;
const uint32 alpha32 = colour.data & 0xFF000000;
__m128i ret;
#ifdef _SQ64
ret = _mm_cvtsi64_si128(c16);
#else
INSR64(c16, ret, 0);
#endif
LOAD64(c16, ret);
if (ob != 0) {
/* Reduce overbright strength. */
ob /= 2;
__m128i ob128;
#ifdef _SQ64
ob128 = _mm_cvtsi64_si128(ob | ob << 16 | ob << 32);
#else
INSR64(ob | ob << 16 | ob << 32, ob128, 0);
#endif
__m128i ob128 = _mm_cvtsi32_si128(ob);
ob128 = _mm_shufflelo_epi16(ob128, 0xC0);
__m128i white = OVERBRIGHT_VALUE_MASK;
__m128i c128 = ret;
ret = _mm_subs_epu16(white, c128); /* PSUBUSW, (255 - rgb) */