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| author | rubidium <rubidium@openttd.org> | 2014-01-13 17:58:58 +0000 |
|---|---|---|
| committer | rubidium <rubidium@openttd.org> | 2014-01-13 17:58:58 +0000 |
| commit | 6e34672c6ca636b38ed3711f3f2be444ae12bfdf (patch) | |
| tree | cf1f9d787a3d1a3fbd222f96bd2e2cc2c26d69b6 /src/blitter/32bpp_sse2.hpp | |
| parent | 76661f2c56e6542fe3023cf22814237a25a4a7bd (diff) | |
| download | openttd-6e34672c6ca636b38ed3711f3f2be444ae12bfdf.tar.xz | |
(svn r26250) -Codechange: deduplicate darkening (e.g. shadow) code (MJP)
Diffstat (limited to 'src/blitter/32bpp_sse2.hpp')
| -rw-r--r-- | src/blitter/32bpp_sse2.hpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/blitter/32bpp_sse2.hpp b/src/blitter/32bpp_sse2.hpp index 98acb8cd1..386b5d3e3 100644 --- a/src/blitter/32bpp_sse2.hpp +++ b/src/blitter/32bpp_sse2.hpp @@ -81,6 +81,19 @@ typedef union ALIGN(16) um128i { PACK_AB_WITHOUT_SATURATION(srcAB, srcABCD); \ } +/* Darken 2 pixels. + * rgb = rgb * ((256/4) * 4 - (alpha/4)) / ((256/4) * 4) + */ +#define DARKEN_2() \ + __m128i srcAB = _mm_unpacklo_epi8(srcABCD, _mm_setzero_si128()); \ + __m128i dstAB = _mm_unpacklo_epi8(dstABCD, _mm_setzero_si128()); \ + __m128i PUT_ALPHA_IN_FRONT_OF_RGB(srcAB, alphaAB); \ + alphaAB = _mm_srli_epi16(alphaAB, 2); /* Reduce to 64 levels of shades so the max value fits in 16 bits. */ \ + __m128i nom = _mm_sub_epi16(tr_nom_base, alphaAB); \ + dstAB = _mm_mullo_epi16(dstAB, nom); \ + dstAB = _mm_srli_epi16(dstAB, 8); \ + dstAB = _mm_packus_epi16(dstAB, dstAB); + /** Base methods for 32bpp SSE blitters. */ class Blitter_32bppSSE_Base { public: |