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Adjust SNES luminosity curve to start from zero

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The existing luminosity curve does not start from zero, which causes
graphical issues with some games (screens that should be black not being
black).
This commit is contained in:
Ilari Liusvaara 2020-02-26 06:36:09 +02:00
parent f37bcfbd49
commit 1fe5434797
1 changed files with 4 additions and 4 deletions
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8
src/library/framebuffer-pixfmt-lrgb.cpp
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@ -13,13 +13,13 @@ void _pixfmt_lrgb::decode(uint32_t* target, const uint8_t* src, size_t width)
const uint32_t* _src = reinterpret_cast<const uint32_t*>(src); const uint32_t* _src = reinterpret_cast<const uint32_t*>(src);
for(size_t i = 0; i < width; i++) { for(size_t i = 0; i < width; i++) {
uint32_t word = _src[i]; uint32_t word = _src[i];
uint32_t l = 1 + ((word >> 15) & 0xF); uint32_t l = ((word >> 15) & 0xF);
uint32_t r = l * ((word >> 0) & 0x1F); uint32_t r = l * ((word >> 0) & 0x1F);
uint32_t g = l * ((word >> 5) & 0x1F); uint32_t g = l * ((word >> 5) & 0x1F);
uint32_t b = l * ((word >> 10) & 0x1F); uint32_t b = l * ((word >> 10) & 0x1F);
uint32_t x = (((r << 8) - r + 248) / 496) << 16; uint32_t x = (((r << 8) - r + 232) / 465) << 16;
x |= (((g << 8) - g + 248) / 496) << 8; x |= (((g << 8) - g + 232) / 465) << 8;
x |= ((b << 8) - b + 248) / 496; x |= ((b << 8) - b + 232) / 465;
target[i] = x; target[i] = x;
} }
} }